Changes necessary for GCC (#9672)

These three formats would likely break even if used on a device where
they are supported, as we reshape all 3-channel buffers to 4 channel.
The data would be in the wrong format.

We will have to follow-up, as there are other formats that are affected,
but those formats likely have better driver support, as they are better
aligned formats (e.g. 16-bit, 32-bit). These three formats were 96-bit
formats, which we've remapped to 128-bit.

.github/actions/mac-prereq/action.yml

@@ -15,7 +15,7 @@ runs:
       uses: actions/cache@v4 # Use a specific version
       with:
         path: ~/Library/Caches/Homebrew
-        key: ${{ runner.os }}-brew-20250424
+        key: ${{ runner.os }}-brew-20251211
     - name: Install Mac Prerequisites
       shell: bash
       run: |

.github/workflows/android-continuous.yml

@@ -1,25 +0,0 @@
-name: Android
-
-on:
-  push:
-    branches:
-      - main
-      - release
-      - rc/**
-
-jobs:
-  build-android:
-    name: build-android
-    # We intentially use a larger runner here to enable larger disk space
-    # (standard linux runner will fail on disk space and faster build time).
-    runs-on: 'ubuntu-24.04-16core'
-
-    steps:
-      - uses: actions/checkout@v4.1.6
-        with:
-          fetch-depth: 0
-      - uses: ./.github/actions/linux-prereq
-      - name: Run Android Continuous
-        uses: ./.github/actions/android-continuous
-        with:
-          build-abi: armeabi-v7a,arm64-v8a,x86_64

.github/workflows/ios-continuous.yml

@@ -1,29 +0,0 @@
-name: iOS
-
-on:
-  push:
-    branches:
-      - main
-      - release
-      - rc/**
-
-jobs:
-  build-ios:
-    name: build-ios
-    runs-on: macos-14-xlarge
-
-    steps:
-      - uses: actions/checkout@v4.1.6
-        with:
-          fetch-depth: 0
-      - uses: ./.github/actions/mac-prereq
-      - name: Run build script
-        run: |
-          cd build/ios && printf "y" | ./build.sh continuous
-      - uses: actions/upload-artifact@v4
-        with:
-          name: filament-ios
-          path: out/filament-release-ios.tgz
-      - name: Build iOS samples
-        run: |
-          cd build/ios && ./build-samples.sh continuous

.github/workflows/linux-continuous.yml

@@ -1,26 +0,0 @@
-name: Linux
-
-on:
-  push:
-    branches:
-      - main
-      - release
-      - rc/**
-
-jobs:
-  build-linux:
-    name: build-linux
-    runs-on: 'ubuntu-24.04-16core'
-
-    steps:
-      - uses: actions/checkout@v4.1.6
-        with:
-          fetch-depth: 0
-      - uses: ./.github/actions/linux-prereq
-      - name: Run build script
-        run: |
-          cd build/linux && printf "y" | ./build.sh continuous
-      - uses: actions/upload-artifact@v4
-        with:
-          name: filament-linux
-          path: out/filament-release-linux.tgz

.github/workflows/mac-continuous.yml

@@ -1,29 +0,0 @@
-name: macOS
-
-on:
-  push:
-    branches:
-      - main
-      - release
-      - rc/**
-
-jobs:
-  build-mac:
-    name: build-mac
-    runs-on: macos-14-xlarge
-
-    steps:
-      - uses: actions/checkout@v4.1.6
-        with:
-          fetch-depth: 0
-      - uses: ./.github/actions/mac-prereq
-      - name: Run build script
-        run: |
-          cd build/mac && printf "y" | ./build.sh continuous
-      - uses: actions/upload-artifact@v4
-        with:
-          name: filament-mac
-          path: out/filament-release-darwin.tgz
-      - name: Check public headers
-        run: |
-          test/check-headers/test.sh out/release/filament/include

.github/workflows/postsubmit-main.yml

@@ -0,0 +1,59 @@
+name: 'Postsubmit Tasks'
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  update-renderdiff-goldens:
+    name: update-renderdiff-goldens
+    runs-on: 'ubuntu-24.04-4core'
+    steps:
+      - uses: actions/checkout@v4.1.6
+        with:
+          fetch-depth: 0
+      - uses: ./.github/actions/linux-prereq
+      - id: get_commit_msg
+        uses: ./.github/actions/get-commit-msg
+      - name: Prerequisites
+        run: pip install tifffile numpy
+      - name: Run update script
+        env:
+          GH_TOKEN: ${{ secrets.FILAMENTBOT_TOKEN }}
+          COMMIT_MESSAGE: ${{ steps.get_commit_msg.outputs.msg }}
+        run: |
+          GOLDEN_BRANCH=$(echo "${COMMIT_MESSAGE}" | python3 test/renderdiff/src/commit_msg.py)
+          COMMIT_HASH="${{ steps.get_commit_msg.outputs.hash }}"
+          if [[ "${GOLDEN_BRANCH}" != "main" ]]; then
+              git config --global user.email "filament.bot@gmail.com"
+              git config --global user.name "Filament Bot"
+              git config --global credential.helper cache
+              echo "branch==${GOLDEN_BRANCH}"
+              echo "hash==${COMMIT_HASH}"
+              python3 test/renderdiff/src/update_golden.py --branch=${GOLDEN_BRANCH} \
+                  --merge-to-main --filament-tag=${COMMIT_HASH} --golden-repo-token=${GH_TOKEN}
+          fi
+
+  update-docs:
+    name: update-docs
+    runs-on: 'ubuntu-24.04-4core'
+    steps:
+      - uses: actions/checkout@v4.1.6
+        with:
+          fetch-depth: 0
+      - uses: ./.github/actions/linux-prereq
+      - id: get_commit_msg
+        uses: ./.github/actions/get-commit-msg
+      - name: Prerequisites
+        run: pip install selenium
+      - name: Run update script
+        env:
+          GH_TOKEN: ${{ secrets.FILAMENTBOT_TOKEN }}
+        run: |
+          bash docs_src/build/install_mdbook.sh && source ~/.bashrc
+          COMMIT_HASH="${{ steps.get_commit_msg.outputs.hash }}"
+          git config --global user.email "filament.bot@gmail.com"
+          git config --global user.name "Filament Bot"
+          git config --global credential.helper cache
+          bash docs_src/build/postsubmit.sh ${COMMIT_HASH} ${GH_TOKEN}

.github/workflows/postsubmit.yml

@@ -1,58 +1,115 @@
-name: 'Post-submit tasks'
+name: 'Postsubmit CI'
 
 on:
   push:
     branches:
       - main
+      - release
+      - rc/**
 
 jobs:
-  update-renderdiff-goldens:
-    name: update-renderdiff-goldens
-    runs-on: 'ubuntu-24.04-4core'
-    steps:
-      - uses: actions/checkout@v4.1.6
-        with:
-          fetch-depth: 0
-      - uses: ./.github/actions/linux-prereq
-      - id: get_commit_msg
-        uses: ./.github/actions/get-commit-msg
-      - name: Prerequisites
-        run: pip install tifffile numpy
-      - name: Run update script
-        env:
-          GH_TOKEN: ${{ secrets.FILAMENTBOT_TOKEN }}
-        run: |
-          GOLDEN_BRANCH=$(echo "${{ steps.get_commit_msg.outputs.msg }}" | python3 test/renderdiff/src/commit_msg.py)
-          COMMIT_HASH="${{ steps.get_commit_msg.outputs.hash }}"
-          if [[ "${GOLDEN_BRANCH}" != "main" ]]; then
-              git config --global user.email "filament.bot@gmail.com"
-              git config --global user.name "Filament Bot"
-              git config --global credential.helper cache
-              echo "branch==${GOLDEN_BRANCH}"
-              echo "hash==${COMMIT_HASH}"
-              python3 test/renderdiff/src/update_golden.py --branch=${GOLDEN_BRANCH} \
-                  --merge-to-main --filament-tag=${COMMIT_HASH} --golden-repo-token=${GH_TOKEN}
-          fi
+  build-android:
+    name: build-android
+    # We intentially use a larger runner here to enable larger disk space
+    # (standard linux runner will fail on disk space and faster build time).
+    runs-on: 'ubuntu-24.04-16core'
 
-  update-docs:
-    name: update-docs
-    runs-on: 'ubuntu-24.04-4core'
     steps:
       - uses: actions/checkout@v4.1.6
         with:
           fetch-depth: 0
       - uses: ./.github/actions/linux-prereq
-      - id: get_commit_msg
-        uses: ./.github/actions/get-commit-msg
-      - name: Prerequisites
-        run: pip install selenium
-      - name: Run update script
-        env:
-          GH_TOKEN: ${{ secrets.FILAMENTBOT_TOKEN }}
+      - name: Run Android Continuous
+        uses: ./.github/actions/android-continuous
+        with:
+          build-abi: armeabi-v7a,arm64-v8a,x86_64
+
+  build-ios:
+    name: build-ios
+    runs-on: macos-14-xlarge
+
+    steps:
+      - uses: actions/checkout@v4.1.6
+        with:
+          fetch-depth: 0
+      - uses: ./.github/actions/mac-prereq
+      - name: Run build script
         run: |
-          bash docs_src/build/install_mdbook.sh && source ~/.bashrc
-          COMMIT_HASH="${{ steps.get_commit_msg.outputs.hash }}"
-          git config --global user.email "filament.bot@gmail.com"
-          git config --global user.name "Filament Bot"
-          git config --global credential.helper cache
-          bash docs_src/build/postsubmit.sh ${COMMIT_HASH} ${GH_TOKEN}
+          cd build/ios && printf "y" | ./build.sh continuous
+      - uses: actions/upload-artifact@v4
+        with:
+          name: filament-ios
+          path: out/filament-release-ios.tgz
+      - name: Build iOS samples
+        run: |
+          cd build/ios && ./build-samples.sh continuous
+
+  build-linux:
+    name: build-linux
+    runs-on: 'ubuntu-24.04-16core'
+
+    steps:
+      - uses: actions/checkout@v4.1.6
+        with:
+          fetch-depth: 0
+      - uses: ./.github/actions/linux-prereq
+      - name: Run build script
+        run: |
+          cd build/linux && printf "y" | ./build.sh continuous
+      - uses: actions/upload-artifact@v4
+        with:
+          name: filament-linux
+          path: out/filament-release-linux.tgz
+
+  build-mac:
+    name: build-mac
+    runs-on: macos-14-xlarge
+
+    steps:
+      - uses: actions/checkout@v4.1.6
+        with:
+          fetch-depth: 0
+      - uses: ./.github/actions/mac-prereq
+      - name: Run build script
+        run: |
+          cd build/mac && printf "y" | ./build.sh continuous
+      - uses: actions/upload-artifact@v4
+        with:
+          name: filament-mac
+          path: out/filament-release-darwin.tgz
+      - name: Check public headers
+        run: |
+          test/check-headers/test.sh out/release/filament/include
+
+  build-web:
+    name: build-web
+    runs-on: 'ubuntu-24.04-16core'
+
+    steps:
+      - uses: actions/checkout@v4.1.6
+        with:
+          fetch-depth: 0
+      - uses: ./.github/actions/linux-prereq
+      - uses: ./.github/actions/web-prereq
+      - name: Run build script
+        run: |
+          cd build/web && printf "y" | ./build.sh continuous
+      - uses: actions/upload-artifact@v4
+        with:
+          name: filament-web
+          path: out/filament-release-web.tgz
+
+  build-windows:
+    name: build-windows
+    runs-on: windows-2022-32core
+
+    steps:
+      - uses: actions/checkout@v4.1.6
+      - name: Run build script
+        run: |
+          build\windows\build-github.bat continuous
+        shell: cmd
+      - uses: actions/upload-artifact@v4
+        with:
+          name: filament-windows
+          path: out/filament-windows.tgz

.github/workflows/presubmit.yml

@@ -1,4 +1,4 @@
-name: Presubmit
+name: 'Presubmit CI'
 
 on:
   push:
@@ -19,7 +19,7 @@ jobs:
       - uses: ./.github/actions/mac-prereq
       - name: Run build script
         run: |
-          cd build/mac && printf "y" | ./build.sh presubmit
+          cd build/mac && printf "y" | ./build.sh presubmit-with-test
       - name: Test material parser
         run: |
           out/cmake-release/filament/test/test_material_parser
@@ -134,18 +134,17 @@ jobs:
         env:
           COMMIT_MESSAGE: ${{ steps.get_commit_msg.outputs.msg }}
         run: |
-          ls ./gltf/Models
           TEST_DIR=test/renderdiff
           source ${TEST_DIR}/src/preamble.sh
-          start_
+          set -eux
           GOLDEN_BRANCH=$(echo "${COMMIT_MESSAGE}" | python3 ${TEST_DIR}/src/commit_msg.py)
-          bash ${TEST_DIR}/generate.sh && \
-              python3 ${TEST_DIR}/src/golden_manager.py \
+          bash ${TEST_DIR}/generate.sh
+          python3 ${TEST_DIR}/src/golden_manager.py \
                   --branch=${GOLDEN_BRANCH} \
                   --output=${GOLDEN_OUTPUT_DIR}
 
-          # Note that we need to upload the output even if comparison fails, so we undo `set -ex`
-          end_
+          # Note that we need to upload the output even if comparison fails, so we undo `set -eux`
+          set +eux
 
           python3 ${TEST_DIR}/src/compare.py \
               --src=${GOLDEN_OUTPUT_DIR} \
@@ -158,6 +157,7 @@ jobs:
              cat compare_output.txt >> "$GITHUB_OUTPUT"
              echo "$DELIMITER" >> "$GITHUB_OUTPUT"
           fi
+        shell: bash
       - uses: actions/upload-artifact@v4
         with:
           name: presubmit-renderdiff-result

.github/workflows/release.yml

@@ -163,9 +163,7 @@ jobs:
           mv out/filamat-android-release.aar out/filamat-${TAG}-android.aar
           mv out/gltfio-android-release.aar out/gltfio-${TAG}-android.aar
           mv out/filament-utils-android-release.aar out/filament-utils-${TAG}-android.aar
-          cd out/android-release/filament
-          tar -czf ../../filament-${TAG}-android-native.tgz .
-          cd ../../..
+          mv out/filament-android-release-linux.tgz out/filament-${TAG}-android-native.tgz
       - name: Sign sample-gltf-viewer
         run: |
           echo "${APK_KEYSTORE_BASE64}" > filament.jks.base64
@@ -245,7 +243,8 @@ jobs:
         env:
           TAG: ${{ steps.git_ref.outputs.tag }}
         run: |
-          build\windows\build-github.bat release
+          @REMARK 'call' is required to ensure control returns to this script after the batch file finishes.
+          call build\windows\build-github.bat release
           echo on
           move out\filament-windows.tgz out\filament-%TAG%-windows.tgz
         shell: cmd

.github/workflows/web-continuous.yml

@@ -1,27 +0,0 @@
-name: Web
-
-on:
-  push:
-    branches:
-      - main
-      - release
-      - rc/**
-
-jobs:
-  build-web:
-    name: build-web
-    runs-on: 'ubuntu-24.04-16core'
-
-    steps:
-      - uses: actions/checkout@v4.1.6
-        with:
-          fetch-depth: 0
-      - uses: ./.github/actions/linux-prereq
-      - uses: ./.github/actions/web-prereq
-      - name: Run build script
-        run: |
-          cd build/web && printf "y" | ./build.sh continuous
-      - uses: actions/upload-artifact@v4
-        with:
-          name: filament-web
-          path: out/filament-release-web.tgz

.github/workflows/windows-continuous.yml

@@ -1,24 +0,0 @@
-name: Windows
-
-on:
-  push:
-    branches:
-      - main
-      - release
-      - rc/**
-
-jobs:
-  build-windows:
-    name: build-windows
-    runs-on: windows-2022-32core
-
-    steps:
-      - uses: actions/checkout@v4.1.6
-      - name: Run build script
-        run: |
-          build\windows\build-github.bat continuous
-        shell: cmd
-      - uses: actions/upload-artifact@v4
-        with:
-          name: filament-windows
-          path: out/filament-windows.tgz

BUILDING.md

@@ -1,6 +1,6 @@
-## Building Filament
+# Building Filament
 
-### Prerequisites
+## Prerequisites
 
 To build Filament, you must first install the following tools:
 
@@ -18,7 +18,7 @@ To build Filament for Android you must also install the following:
 - Android NDK 25.1 or higher
 - Java 17
 
-### Environment variables
+## Environment variables
 
 To build Filament for Android, make sure the environment variable `ANDROID_HOME` points to the
 location of your Android SDK.
@@ -30,7 +30,7 @@ When building for WebGL, you'll also need to set `EMSDK`. See [WebAssembly](#web
 We recommend using CLion to develop for Filament. Simply open the root directory's CMakeLists.txt
 in CLion to obtain a usable project.
 
-### Easy build
+## Easy build
 
 Once the required OS specific dependencies listed below are installed, you can use the script
 located in `build.sh` to build Filament easily on macOS and Linux.
@@ -67,7 +67,7 @@ For more specialized options, please also consider the following pages:
  - `-t`: [`fgviewer`](https://google.github.io/filament/dup/fgviewer.html)
  - `-b` and `-y`: [ASAN/UBSAN builds](https://google.github.io/filament/notes/asan_ubsan.html)
 
-### Filament-specific CMake Options
+## Filament-specific CMake Options
 
 The following CMake options are boolean options specific to Filament:
 
@@ -89,7 +89,7 @@ cmake . -DOPTION=ON       # Replace OPTION with the option name, set to ON / OFF
 
 Options can also be set with the CMake GUI.
 
-### Linux
+## Linux
 
 Make sure you've installed the following dependencies:
 
@@ -148,7 +148,7 @@ ninja
 
 This will build Filament, its tests and samples, and various host tools.
 
-### macOS
+## macOS
 
 To compile Filament you must have the most recent version of Xcode installed and you need to
 make sure the command line tools are setup by running:
@@ -169,7 +169,7 @@ cmake -G Ninja -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=../release/fila
 ninja
 ```
 
-### iOS
+## iOS
 
 The easiest way to build Filament for iOS is to use `build.sh` and the
 `-p ios` flag. For instance to build the debug target:
@@ -180,9 +180,9 @@ The easiest way to build Filament for iOS is to use `build.sh` and the
 
 See [ios/samples/README.md](./ios/samples/README.md) for more information.
 
-### Windows
+## Windows
 
-#### Building on Windows with Visual Studio 2019 or later
+### Building on Windows with Visual Studio 2019 or later
 
 Install the following components:
 
@@ -225,7 +225,7 @@ You can also use CMake to invoke the build without opening Visual Studio. For ex
 cmake --build . --target gltf_viewer --config Release
 ```
 
-### Android
+## Android
 
 Before building Filament for Android, make sure to build Filament for your host. Some of the
 host tools are required to successfully build for Android.
@@ -242,7 +242,13 @@ foremost for `arm64-v8a`.
 
 To build Android on Windows machines, see [android/Windows.md](android/Windows.md).
 
-#### Easy Android build
+### Important: SDK location
+
+Either ensure your `ANDROID_HOME` environment variable is set or make sure the root project
+contains a `local.properties` file with the `sdk.dir` property pointing to your installation of
+the Android SDK.
+
+### Easy Android build
 
 The easiest way to build Filament for Android is to use `build.sh` and the
 `-p android` flag. For instance to build the release target:
@@ -251,9 +257,46 @@ The easiest way to build Filament for Android is to use `build.sh` and the
 ./build.sh -p android release
 ```
 
+To build a sample (such as `android/samples/sample-hello-triangle`) for an ARM 64-bit phone, you would run
+```shell
+./build.sh -p android -q arm64-v8a -k sample-hello-triangle release
+```
+
+The output APK can be found in `android/samples/sample-hello-triangle/build/outputs/apk/release/sample-hello-triangle-release-unsigned.apk`
+
 Run `build.sh -h` for more information.
 
-#### Manual builds
+### Android Studio
+
+You must use the latest stable release of Android Studio.
+
+The Android build of filament is separated into java/kotlin client APIs, a layer of jni bindings
+that bridges java/kotlin with native code, and Filament and other component code that have been compiled
+into architecture-specific libraries. Our default Android Studio gradle setup can compile java/kotlin and
+the jni bindings for you, but it will treat the filament libraries as already compiled and present on
+the system.
+
+Therefore, before compiling the sample app or any other targets, you must
+make sure that the native filament libraries have been compiled and are located at a prescribed location
+so that the jni bindings can link against them. You can do so by using the easy build script
+
+```shell
+./build.sh -p android release -q arm64-v8a
+```
+
+Note that the above step will also install host machine tools into prescribed locations.  These tools are
+required for compiling Filament assets such as materials and environment maps.
+
+Now we are ready to compile the apps.  To open the project, point Studio to the `android` folder.
+After opening the project and syncing with Gradle, select the sample of your choice
+using the drop-down widget in the toolbar. Additionally, you will need to select a deployment target.
+By doing so, Android Studio will automatically try to compile the app only for that specific
+device's architecture. So if you are targeting a new Pixel phone, make sure that the step above
+(compiling the library) is targeting ARM 64-bit (`-q arm64-v8a` ), and if you are running the app on
+an emulator on a Linux machine with an x86 64-bit chipset, you would indicate (`-q x86_64`) in the above step.
+
+
+### Manual builds
 
 Invoke CMake in a build directory of your choice, inside of filament's directory. The commands
 below show how to build Filament for ARM 64-bit (`aarch64`).
@@ -281,7 +324,7 @@ This will generate Filament's Android binaries in `out/android-release`. This lo
 to build the Android Studio projects located in `filament/android`. After install, the library
 binaries should be found in `out/android-release/filament/lib/arm64-v8a`.
 
-#### AAR
+### AAR
 
 Before you attempt to build the AAR, make sure you've compiled and installed the native libraries
 as explained in the sections above. You must have the following ABIs built in
@@ -313,7 +356,7 @@ Alternatively you can build the AAR from the command line by executing the follo
 The `-Pcom.google.android.filament.dist-dir` can be used to specify a different installation
 directory (it must match the CMake install prefix used in the previous steps).
 
-#### Using Filament's AAR
+### Using Filament's AAR
 
 Create a new module in your project and select _Import .JAR or .AAR Package_ when prompted. Make
 sure to add the newly created module as a dependency to your application.
@@ -354,7 +397,7 @@ productFlavors {
 }
 ```
 
-### WebAssembly
+## WebAssembly
 
 The core Filament library can be cross-compiled to WebAssembly from either macOS or Linux. To get
 started, follow the instructions for building Filament on your platform ([macOS](#macos) or

CMakeLists.txt

@@ -10,6 +10,7 @@ cmake_minimum_required(VERSION 3.22.1)
 # ==================================================================================================
 # Toolchain configuration
 # ==================================================================================================
+# On iOS, the deployment target is set inside third_party/clang/ios.cmake
 if (APPLE AND NOT IOS)
     # This must be set before project() is called
     set(CMAKE_OSX_DEPLOYMENT_TARGET 10.15 CACHE STRING "")
@@ -48,8 +49,6 @@ option(FILAMENT_ENABLE_COVERAGE "Enable LLVM code coverage" OFF)
 
 option(FILAMENT_ENABLE_FEATURE_LEVEL_0 "Enable Feature Level 0" ON)
 
-option(FILAMENT_ENABLE_MULTIVIEW "Enable multiview for Filament" OFF)
-
 option(FILAMENT_SUPPORTS_OSMESA "Enable OSMesa (headless GL context) for Filament" OFF)
 
 option(FILAMENT_ENABLE_FGVIEWER "Enable the frame graph viewer" OFF)
@@ -367,14 +366,22 @@ endif()
 
 if (LINUX)
     option(USE_STATIC_LIBCXX "Link against the static runtime libraries." ON)
+
+    # Add this step to support both glibc-based Linux distributions (e.g., Ubuntu, Debian)
+    # and musl-based distributions (e.g., Alpine).
+    include(CheckSymbolExists)
+    check_symbol_exists(__GLIBC__ "features.h" CLANG_WITH_GLIBC)
+
     if (${USE_STATIC_LIBCXX})
         if (FILAMENT_USING_GCC)
             link_libraries("-static-libgcc -static-libstdc++")
-        else ()
+        elseif (CLANG_WITH_GLIBC)
             set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
             link_libraries("-static-libgcc -static-libstdc++")
             link_libraries(libc++.a)
             link_libraries(libc++abi.a)
+        else()
+            set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -static")
         endif()
     endif()
 
@@ -473,7 +480,7 @@ endif()
 set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} ${EXTRA_SANITIZE_OPTIONS}")
 
 if (FILAMENT_ENABLE_COVERAGE)
-    set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -fprofile-instr-generate -fcoverage-mapping")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fprofile-instr-generate -fcoverage-mapping -Wno-pass-failed")
 endif()
 
 # Disable the stack check for macOS to workaround a known issue in clang 11.0.0.
@@ -563,6 +570,10 @@ if (FILAMENT_SUPPORTS_WEBGPU)
     add_definitions(-DFILAMENT_SUPPORTS_WEBGPU)
 endif()
 
+if (FILAMENT_SUPPORTS_WEBP_TEXTURES)
+    add_definitions(-DFILAMENT_SUPPORTS_WEBP_TEXTURES)
+endif()
+
 # Build with Metal support on non-WebGL Apple platforms.
 if (APPLE AND NOT WEBGL)
     option(FILAMENT_SUPPORTS_METAL "Include the Metal backend" ON)
@@ -574,7 +585,7 @@ if (FILAMENT_SUPPORTS_METAL)
 endif()
 
 # Building filamat increases build times and isn't required for web, so turn it off by default.
-if (NOT WEBGL AND NOT IOS)
+if (NOT WEBGL)
     option(FILAMENT_BUILD_FILAMAT "Build filamat and JNI buildings" ON)
 else()
     option(FILAMENT_BUILD_FILAMAT "Build filamat and JNI buildings" OFF)
@@ -594,23 +605,6 @@ else()
     option(FILAMENT_DISABLE_MATOPT "Disable material optimizations" ON)
 endif()
 
-# This only affects the prebuilt shader files in gltfio and samples, not filament library.
-# The value can be either "instanced", "multiview", or "none"
-set(FILAMENT_SAMPLES_STEREO_TYPE "none" CACHE STRING
-    "Stereoscopic type that shader files in gltfio and samples are built for."
-)
-string(TOLOWER "${FILAMENT_SAMPLES_STEREO_TYPE}" FILAMENT_SAMPLES_STEREO_TYPE)
-if (NOT FILAMENT_SAMPLES_STEREO_TYPE STREQUAL "instanced"
-    AND NOT FILAMENT_SAMPLES_STEREO_TYPE STREQUAL "multiview"
-    AND NOT FILAMENT_SAMPLES_STEREO_TYPE STREQUAL "none")
-    message(FATAL_ERROR "Invalid stereo type: \"${FILAMENT_SAMPLES_STEREO_TYPE}\" choose either \"instanced\",  \"multiview\", or \"none\" ")
-endif ()
-
-# Compiling samples for multiview implies enabling multiview feature as well.
-if (FILAMENT_SAMPLES_STEREO_TYPE STREQUAL "multiview")
-    set(FILAMENT_ENABLE_MULTIVIEW ON)
-endif ()
-
 # Define backend flag for debug only
 if (CMAKE_BUILD_TYPE STREQUAL "Debug" AND NOT FILAMENT_BACKEND_DEBUG_FLAG STREQUAL "")
     add_definitions(-DFILAMENT_BACKEND_DEBUG_FLAG=${FILAMENT_BACKEND_DEBUG_FLAG})
@@ -864,6 +858,7 @@ add_subdirectory(${LIBRARIES}/gltfio)
 add_subdirectory(${LIBRARIES}/ibl)
 add_subdirectory(${LIBRARIES}/iblprefilter)
 add_subdirectory(${LIBRARIES}/image)
+add_subdirectory(${LIBRARIES}/imagediff)
 add_subdirectory(${LIBRARIES}/ktxreader)
 add_subdirectory(${LIBRARIES}/math)
 add_subdirectory(${LIBRARIES}/mathio)
@@ -872,7 +867,9 @@ add_subdirectory(${LIBRARIES}/utils)
 add_subdirectory(${LIBRARIES}/viewer)
 add_subdirectory(${FILAMENT}/shaders)
 add_subdirectory(${EXTERNAL}/abseil/tnt)
-add_subdirectory(${EXTERNAL}/basisu/tnt)
+# Add zstd before basisu to force it to use the external zstd target,
+# preventing a duplicate symbol conflict with its bundled version.
+add_subdirectory(${EXTERNAL}/zstd/tnt)
 add_subdirectory(${EXTERNAL}/civetweb/tnt)
 add_subdirectory(${EXTERNAL}/imgui/tnt)
 add_subdirectory(${EXTERNAL}/robin-map/tnt)
@@ -886,8 +883,10 @@ add_subdirectory(${EXTERNAL}/jsmn/tnt)
 add_subdirectory(${EXTERNAL}/stb/tnt)
 add_subdirectory(${EXTERNAL}/getopt)
 add_subdirectory(${EXTERNAL}/perfetto/tnt)
-add_subdirectory(${EXTERNAL}/zstd/tnt)
+add_subdirectory(${EXTERNAL}/basisu/tnt)
 
+# imageio-lite is needed for viewer
+add_subdirectory(${LIBRARIES}/imageio-lite)
 
 # Note that this has to be placed after mikktspace in order for combine_static_libs to work.
 add_subdirectory(${LIBRARIES}/geometry)
@@ -913,7 +912,6 @@ endif()
 
 if (FILAMENT_SUPPORTS_WEBP_TEXTURES)
     add_subdirectory(${EXTERNAL}/libwebp/tnt)
-    add_definitions(-DFILAMENT_SUPPORTS_WEBP_TEXTURES)
 endif()
 
 if (FILAMENT_SUPPORTS_VULKAN)
@@ -971,6 +969,7 @@ if (IS_HOST_PLATFORM)
     add_subdirectory(${TOOLS}/roughness-prefilter)
     add_subdirectory(${TOOLS}/specular-color)
     add_subdirectory(${TOOLS}/uberz)
+    add_subdirectory(${TOOLS}/specgen)
 endif()
 
 # Generate exported executables for cross-compiled builds (Android, WebGL, and iOS)

NEW_RELEASE_NOTES.md

@@ -6,7 +6,3 @@
 appropriate header in [RELEASE_NOTES.md](./RELEASE_NOTES.md).
 
 ## Release notes for next branch cut
-
-- engine: add `View::getLastDynamicResolutionScale()` (b/457753622)
-
-- materials: Make Material Instances' UBO descriptor use dynamic offsets. [⚠️ **Recompile Materials**]

README.md

@@ -31,7 +31,7 @@ repositories {
 }
 
 dependencies {
-    implementation 'com.google.android.filament:filament-android:1.67.0'
+    implementation 'com.google.android.filament:filament-android:1.69.2'
 }
 ```
 
@@ -51,7 +51,7 @@ Here are all the libraries available in the group `com.google.android.filament`:
 iOS projects can use CocoaPods to install the latest release:
 
 ```shell
-pod 'Filament', '~> 1.67.0'
+pod 'Filament', '~> 1.69.2'
 ```
 
 ## Documentation

RELEASE_NOTES.md

@@ -7,6 +7,44 @@ A new header is inserted each time a *tag* is created.
 Instead, if you are authoring a PR for the main branch, add your release note to
 [NEW_RELEASE_NOTES.md](./NEW_RELEASE_NOTES.md).
 
+## v1.69.2
+
+- engine: fix shader compilation failure in TAA material
+- engine: fix stereo & parallel shader compilation
+
+## v1.69.1
+
+
+## v1.69.0
+
+- engine: Support custom attributes morphing, and allow for omitting position and/or normal data. [⚠️ **Recompile Materials**]
+
+## v1.68.5
+
+- engine: "native" Streams are officially deprecated. Use "acquired" streams instead.
+- engine: add "engine.skip_frame_when_cpu_ahead_of_display" feature [b/474599530]
+
+## v1.68.4
+
+- gltfio: Add optional support for webp textures (EXT_texture_webp), controlled via FILAMENT_SUPPORTS_WEBP_TEXTURES cmake option
+
+## v1.68.3
+
+- materials: added support for the glTF `KHR_materials_dispersion` extension, which adds dispersion for refractive objects
+
+## v1.68.2
+
+- Support `setPresentationTime` with the Metal backend.
+
+## v1.68.1
+
+
+## v1.68.0
+
+- engine: add `View::getLastDynamicResolutionScale()` (b/457753622)
+- Metal: report GPU errors to the platform via `debugUpdateStat` (b/431665753).
+- materials: Make Material Instances' UBO descriptor use dynamic offsets. [⚠️ **Recompile Materials**]
+
 ## v1.67.1
 
 - Metal: Add support for the `SwapChain::CONFIG_MSAA_4_SAMPLES` flag.

android/build.gradle

@@ -100,7 +100,7 @@ buildscript {
         'kotlin': '2.0.21',
         'kotlin_coroutines': '1.9.0',
         'buildTools': '35.0.0',
-        'ndk': '27.0.11718014',
+        'ndk': '29.0.14206865',
         'androidx_core': '1.13.1',
         'androidx_annotations': '1.9.0'
     ]
@@ -124,6 +124,7 @@ buildscript {
 
     ext.cmakeArgs = [
         "--no-warn-unused-cli",
+        "-DANDROID_WEAK_API_DEFS=ON",
         "-DANDROID_PIE=ON",
         "-DANDROID_PLATFORM=21",
         "-DANDROID_STL=c++_static",
@@ -193,7 +194,7 @@ subprojects {
         google()
     }
 
-    if (!name.startsWith("sample")) {
+    if (!name.startsWith("sample") && name != "filament-tools") {
         apply plugin: 'com.android.library'
 
         android {

android/filamat-android/src/main/cpp/MaterialBuilder.cpp

@@ -335,6 +335,13 @@ Java_com_google_android_filament_filamat_MaterialBuilder_nMaterialBuilderRefract
     builder->refractionMode((MaterialBuilder::RefractionMode) mode);
 }
 
+extern "C" JNIEXPORT void JNICALL
+Java_com_google_android_filament_filamat_MaterialBuilder_nMaterialBuilderReflectionMode(JNIEnv* env,
+        jclass, jlong nativeBuilder, jint mode) {
+    auto builder = (MaterialBuilder*) nativeBuilder;
+    builder->reflectionMode((MaterialBuilder::ReflectionMode) mode);
+}
+
 extern "C" JNIEXPORT void JNICALL
 Java_com_google_android_filament_filamat_MaterialBuilder_nMaterialBuilderRefractionType(JNIEnv* env,
         jclass, jlong nativeBuilder, jint type) {

android/filamat-android/src/main/java/com/google/android/filament/filamat/MaterialBuilder.java

@@ -177,6 +177,11 @@ public class MaterialBuilder {
         SCREEN_SPACE
     }
 
+    public enum ReflectionMode {
+        DEFAULT,
+        SCREEN_SPACE
+    }
+
     public enum RefractionType {
         SOLID,
         THIN
@@ -403,6 +408,12 @@ public class MaterialBuilder {
         return this;
     }
 
+    @NonNull
+    public MaterialBuilder reflectionMode(ReflectionMode mode) {
+        nMaterialBuilderReflectionMode(mNativeObject, mode.ordinal());
+        return this;
+    }
+
     @NonNull
     public MaterialBuilder refractionType(RefractionType type) {
         nMaterialBuilderRefractionType(mNativeObject, type.ordinal());
@@ -604,6 +615,7 @@ public class MaterialBuilder {
     private static native void nMaterialBuilderSpecularAntiAliasingThreshold(long mNativeObject,
             float threshold);
     private static native void nMaterialBuilderRefractionMode(long nativeBuilder, int mode);
+    private static native void nMaterialBuilderReflectionMode(long nativeBuilder, int mode);
     private static native void nMaterialBuilderRefractionType(long nativeBuilder, int type);
     private static native void nMaterialBuilderClearCoatIorChange(long mNativeObject,
             boolean clearCoatIorChange);

android/filament-android/CMakeLists.txt

@@ -134,6 +134,7 @@ target_include_directories(filament-jni PRIVATE
         ../../filament/backend/include
         ../../third_party/robin-map
         ../../third_party/perfetto
+        ../../libs/bluevk/include
         ../../libs/utils/include)
 
 # Ordering is significant in the following list. The PRIVATE qualifier prevents transitive deps.
@@ -167,3 +168,9 @@ target_link_libraries(filament-jni
 
 # Force a relink when the version script is changed:
 set_target_properties(filament-jni PROPERTIES LINK_DEPENDS ${VERSION_SCRIPT})
+
+if (FILAMENT_SUPPORTS_VULKAN)
+    add_definitions(-DFILAMENT_SUPPORTS_VULKAN=1)
+else()
+    add_definitions(-DFILAMENT_SUPPORTS_VULKAN=0)
+endif()

android/filament-android/src/main/cpp/Camera.cpp

@@ -18,6 +18,7 @@
 
 #include <filament/Camera.h>
 
+
 #include <utils/Entity.h>
 
 #include <math/mat4.h>
@@ -40,6 +41,13 @@ Java_com_google_android_filament_Camera_nSetProjectionFov(JNIEnv*, jclass ,
     camera->setProjection(fovInDegrees, aspect, near, far, (Camera::Fov) fov);
 }
 
+extern "C" JNIEXPORT jdouble JNICALL
+Java_com_google_android_filament_Camera_nGetFieldOfViewInDegrees(JNIEnv*, jclass,
+        jlong nativeCamera, jint direction) {
+    Camera *camera = (Camera *) nativeCamera;
+    return camera->getFieldOfViewInDegrees((Camera::Fov) direction);
+}
+
 extern "C" JNIEXPORT void JNICALL
 Java_com_google_android_filament_Camera_nSetLensProjection(JNIEnv*, jclass,
         jlong nativeCamera, jdouble focalLength, jdouble aspect, jdouble near, jdouble far) {
@@ -62,6 +70,21 @@ Java_com_google_android_filament_Camera_nSetCustomProjection(JNIEnv *env, jclass
     env->ReleaseDoubleArrayElements(inProjectionForCulling_, inProjectionForCulling, JNI_ABORT);
 }
 
+extern "C" JNIEXPORT void JNICALL
+Java_com_google_android_filament_Camera_nSetCustomEyeProjection(JNIEnv *env, jclass,
+        jlong nativeCamera, jdoubleArray inProjection_, jint count, jdoubleArray inProjectionForCulling_,
+        jdouble near, jdouble far) {
+    Camera *camera = (Camera *) nativeCamera;
+    jdouble *inProjection = env->GetDoubleArrayElements(inProjection_, NULL);
+    jdouble *inProjectionForCulling = env->GetDoubleArrayElements(inProjectionForCulling_, NULL);
+    camera->setCustomEyeProjection(
+            reinterpret_cast<const filament::math::mat4 *>(inProjection), (size_t) count,
+            *reinterpret_cast<const filament::math::mat4 *>(inProjectionForCulling),
+            near, far);
+    env->ReleaseDoubleArrayElements(inProjection_, inProjection, JNI_ABORT);
+    env->ReleaseDoubleArrayElements(inProjectionForCulling_, inProjectionForCulling, JNI_ABORT);
+}
+
 extern "C" JNIEXPORT void JNICALL
 Java_com_google_android_filament_Camera_nSetScaling(JNIEnv* env, jclass,
         jlong nativeCamera, jdouble x, jdouble y) {
@@ -76,6 +99,17 @@ Java_com_google_android_filament_Camera_nSetShift(JNIEnv* env, jclass,
     camera->setShift({(double)x, (double)y});
 }
 
+extern "C" JNIEXPORT void JNICALL
+Java_com_google_android_filament_Camera_nGetShift(JNIEnv* env, jclass,
+        jlong nativeCamera, jdoubleArray out_) {
+    Camera *camera = (Camera *) nativeCamera;
+    jdouble *out = env->GetDoubleArrayElements(out_, NULL);
+    filament::math::double2 s = camera->getShift();
+    out[0] = s.x;
+    out[1] = s.y;
+    env->ReleaseDoubleArrayElements(out_, out, 0);
+}
+
 extern "C" JNIEXPORT void JNICALL
 Java_com_google_android_filament_Camera_nLookAt(JNIEnv*, jclass, jlong nativeCamera,
         jdouble eye_x, jdouble eye_y, jdouble eye_z, jdouble center_x, jdouble center_y,
@@ -115,6 +149,15 @@ Java_com_google_android_filament_Camera_nSetModelMatrixFp64(JNIEnv *env, jclass,
     env->ReleaseDoubleArrayElements(in_, in, JNI_ABORT);
 }
 
+extern "C" JNIEXPORT void JNICALL
+Java_com_google_android_filament_Camera_nSetEyeModelMatrix(JNIEnv *env, jclass,
+        jlong nativeCamera, jint eyeId, jdoubleArray model_) {
+    Camera* camera = (Camera *) nativeCamera;
+    jdouble *model = env->GetDoubleArrayElements(model_, NULL);
+    camera->setEyeModelMatrix((uint8_t)eyeId, *reinterpret_cast<const filament::math::mat4*>(model));
+    env->ReleaseDoubleArrayElements(model_, model, JNI_ABORT);
+}
+
 extern "C" JNIEXPORT void JNICALL
 Java_com_google_android_filament_Camera_nGetProjectionMatrix(JNIEnv *env, jclass,
         jlong nativeCamera, jdoubleArray out_) {
@@ -280,3 +323,5 @@ Java_com_google_android_filament_Camera_nComputeEffectiveFov(JNIEnv*, jclass,
         jdouble fovInDegrees, jdouble focusDistance) {
     return Camera::computeEffectiveFov(fovInDegrees, focusDistance);
 }
+
+

android/filament-android/src/main/cpp/Engine.cpp

@@ -18,6 +18,7 @@
 
 #include <filament/Camera.h>
 #include <filament/Engine.h>
+#include <filament/MorphTargetBuffer.h>
 
 #include <utils/Entity.h>
 #include <utils/EntityManager.h>
@@ -207,6 +208,14 @@ Java_com_google_android_filament_Engine_nDestroySkinningBuffer(JNIEnv*, jclass,
     return engine->destroy(skinningBuffer);
 }
 
+extern "C" JNIEXPORT jboolean JNICALL
+Java_com_google_android_filament_Engine_nDestroyMorphTargetBuffer(JNIEnv*, jclass,
+                jlong nativeEngine, jlong nativeMorphTargetBuffer) {
+    Engine* engine = (Engine*) nativeEngine;
+    MorphTargetBuffer* mtb = (MorphTargetBuffer*) nativeMorphTargetBuffer;
+    return engine->destroy(mtb);
+}
+
 extern "C" JNIEXPORT jboolean JNICALL
 Java_com_google_android_filament_Engine_nDestroyIndirectLight(JNIEnv*, jclass,
         jlong nativeEngine, jlong nativeIndirectLight) {
@@ -328,6 +337,13 @@ Java_com_google_android_filament_Engine_nIsValidSkinningBuffer(JNIEnv*, jclass,
     return (jboolean)engine->isValid((SkinningBuffer*)nativeSkinningBuffer);
 }
 
+extern "C" JNIEXPORT jboolean JNICALL
+Java_com_google_android_filament_Engine_nIsValidMorphTargetBuffer(JNIEnv*, jclass,
+                jlong nativeEngine, jlong nativeMorphTargetBuffer) {
+    Engine* engine = (Engine*) nativeEngine;
+    return (jboolean) engine->isValid((MorphTargetBuffer*) nativeMorphTargetBuffer);
+}
+
 extern "C" JNIEXPORT jboolean JNICALL
 Java_com_google_android_filament_Engine_nIsValidIndirectLight(JNIEnv*, jclass,
         jlong nativeEngine, jlong nativeIndirectLight) {

android/filament-android/src/main/cpp/Material.cpp

@@ -25,7 +25,7 @@ using namespace filament;
 
 extern "C" JNIEXPORT jlong JNICALL
 Java_com_google_android_filament_Material_nBuilderBuild(JNIEnv *env, jclass,
-        jlong nativeEngine, jobject buffer_, jint size, jint shBandCount, jint shadowQuality) {
+        jlong nativeEngine, jobject buffer_, jint size, jint shBandCount, jint shadowQuality, jint uboBatchingMode) {
     Engine* engine = (Engine*) nativeEngine;
     AutoBuffer buffer(env, buffer_, size);
     auto builder = Material::Builder();
@@ -33,6 +33,7 @@ Java_com_google_android_filament_Material_nBuilderBuild(JNIEnv *env, jclass,
         builder.sphericalHarmonicsBandCount(shBandCount);
     }
     builder.shadowSamplingQuality((Material::Builder::ShadowSamplingQuality)shadowQuality);
+    builder.uboBatching((Material::UboBatchingMode)uboBatchingMode);
     Material* material = builder
             .package(buffer.getData(), buffer.getSize())
             .build(*engine);
@@ -95,6 +96,14 @@ Java_com_google_android_filament_Material_nGetBlendingMode(JNIEnv*, jclass,
     return (jint) material->getBlendingMode();
 }
 
+extern "C"
+JNIEXPORT jint JNICALL
+Java_com_google_android_filament_Material_nGetTransparencyMode(JNIEnv*, jclass,
+        jlong nativeMaterial) {
+    Material* material = (Material*) nativeMaterial;
+    return (jint) material->getTransparencyMode();
+}
+
 
 extern "C"
 JNIEXPORT jint JNICALL

android/filament-android/src/main/cpp/MaterialInstance.cpp

@@ -564,3 +564,19 @@ Java_com_google_android_filament_MaterialInstance_nGetDepthFunc(JNIEnv* env, jcl
     MaterialInstance* instance = (MaterialInstance*)nativeMaterialInstance;
     return (jint)instance->getDepthFunc();
 }
+
+extern "C"
+JNIEXPORT void JNICALL
+Java_com_google_android_filament_MaterialInstance_nSetTransparencyMode(JNIEnv*, jclass,
+        jlong nativeMaterialInstance, jint mode) {
+    MaterialInstance* instance = (MaterialInstance*) nativeMaterialInstance;
+    instance->setTransparencyMode((MaterialInstance::TransparencyMode) mode);
+}
+
+extern "C"
+JNIEXPORT jint JNICALL
+Java_com_google_android_filament_MaterialInstance_nGetTransparencyMode(JNIEnv*, jclass,
+        jlong nativeMaterialInstance) {
+    MaterialInstance* instance = (MaterialInstance*) nativeMaterialInstance;
+    return (jint) instance->getTransparencyMode();
+}

android/filament-android/src/main/cpp/MorphTargetBuffer.cpp

@@ -58,6 +58,27 @@ Java_com_google_android_filament_MorphTargetBuffer_nBuilderCount(JNIEnv*, jclass
     builder->count((size_t) count);
 }
 
+extern "C" JNIEXPORT void JNICALL
+        Java_com_google_android_filament_MorphTargetBuffer_nBuilderWithPositions(JNIEnv*, jclass,
+                jlong nativeBuilder, jboolean enabled) {
+    MorphTargetBuffer::Builder* builder = (MorphTargetBuffer::Builder*) nativeBuilder;
+    builder->withPositions(enabled);
+}
+
+extern "C" JNIEXPORT void JNICALL
+        Java_com_google_android_filament_MorphTargetBuffer_nBuilderWithTangents(JNIEnv*, jclass,
+                jlong nativeBuilder, jboolean enabled) {
+    MorphTargetBuffer::Builder* builder = (MorphTargetBuffer::Builder*) nativeBuilder;
+    builder->withTangents(enabled);
+}
+
+extern "C" JNIEXPORT void JNICALL
+        Java_com_google_android_filament_MorphTargetBuffer_nBuilderEnableCustomMorphing(JNIEnv*,
+                jclass, jlong nativeBuilder, jboolean enabled) {
+    MorphTargetBuffer::Builder* builder = (MorphTargetBuffer::Builder*) nativeBuilder;
+    builder->enableCustomMorphing(enabled);
+}
+
 extern "C"
 JNIEXPORT jlong JNICALL
 Java_com_google_android_filament_MorphTargetBuffer_nBuilderBuild(JNIEnv*, jclass,
@@ -112,3 +133,24 @@ Java_com_google_android_filament_MorphTargetBuffer_nGetCount(JNIEnv*, jclass,
     MorphTargetBuffer *morphTargetBuffer = (MorphTargetBuffer *) nativeObject;
     return (jint)morphTargetBuffer->getCount();
 }
+
+extern "C" JNIEXPORT jboolean JNICALL
+        Java_com_google_android_filament_MorphTargetBuffer_nHasPositions(JNIEnv*, jclass,
+                jlong nativeObject) {
+    MorphTargetBuffer* morphTargetBuffer = (MorphTargetBuffer*) nativeObject;
+    return (jboolean) morphTargetBuffer->hasPositions();
+}
+
+extern "C" JNIEXPORT jboolean JNICALL
+        Java_com_google_android_filament_MorphTargetBuffer_nHasTangents(JNIEnv*, jclass,
+                jlong nativeObject) {
+    MorphTargetBuffer* morphTargetBuffer = (MorphTargetBuffer*) nativeObject;
+    return (jboolean) morphTargetBuffer->hasTangents();
+}
+
+extern "C" JNIEXPORT jboolean JNICALL
+        Java_com_google_android_filament_MorphTargetBuffer_nIsCustomMorphingEnabled(JNIEnv*, jclass,
+                jlong nativeObject) {
+    MorphTargetBuffer* morphTargetBuffer = (MorphTargetBuffer*) nativeObject;
+    return (jboolean) morphTargetBuffer->isCustomMorphingEnabled();
+}

android/filament-android/src/main/cpp/RenderableManager.cpp

@@ -366,6 +366,13 @@ Java_com_google_android_filament_RenderableManager_nSetPriority(JNIEnv*, jclass,
     rm->setPriority((RenderableManager::Instance) i, (uint8_t) priority);
 }
 
+extern "C" JNIEXPORT jint JNICALL
+Java_com_google_android_filament_RenderableManager_nGetPriority(JNIEnv*, jclass,
+        jlong nativeRenderableManager, jint i) {
+    RenderableManager *rm = (RenderableManager *) nativeRenderableManager;
+    return (jint) rm->getPriority((RenderableManager::Instance) i);
+}
+
 extern "C" JNIEXPORT void JNICALL
 Java_com_google_android_filament_RenderableManager_nSetChannel(JNIEnv*, jclass,
         jlong nativeRenderableManager, jint i, jint channel) {
@@ -373,6 +380,13 @@ Java_com_google_android_filament_RenderableManager_nSetChannel(JNIEnv*, jclass,
     rm->setChannel((RenderableManager::Instance) i, (uint8_t) channel);
 }
 
+extern "C" JNIEXPORT jint JNICALL
+Java_com_google_android_filament_RenderableManager_nGetChannel(JNIEnv*, jclass,
+        jlong nativeRenderableManager, jint i) {
+    RenderableManager *rm = (RenderableManager *) nativeRenderableManager;
+    return (jint) rm->getChannel((RenderableManager::Instance) i);
+}
+
 extern "C" JNIEXPORT void JNICALL
 Java_com_google_android_filament_RenderableManager_nSetCulling(JNIEnv*, jclass,
         jlong nativeRenderableManager, jint i, jboolean enabled) {
@@ -380,6 +394,13 @@ Java_com_google_android_filament_RenderableManager_nSetCulling(JNIEnv*, jclass,
     rm->setCulling((RenderableManager::Instance) i, enabled);
 }
 
+extern "C" JNIEXPORT jboolean JNICALL
+Java_com_google_android_filament_RenderableManager_nIsCullingEnabled(JNIEnv*, jclass,
+        jlong nativeRenderableManager, jint i) {
+    RenderableManager *rm = (RenderableManager *) nativeRenderableManager;
+    return (jboolean) rm->isCullingEnabled((RenderableManager::Instance) i);
+}
+
 extern "C" JNIEXPORT void JNICALL
 Java_com_google_android_filament_RenderableManager_nSetFogEnabled(JNIEnv*, jclass,
         jlong nativeRenderableManager, jint i, jboolean enabled) {
@@ -429,6 +450,13 @@ Java_com_google_android_filament_RenderableManager_nIsShadowReceiver(JNIEnv*, jc
     return (jboolean) rm->isShadowReceiver((RenderableManager::Instance) i);
 }
 
+extern "C" JNIEXPORT jboolean JNICALL
+Java_com_google_android_filament_RenderableManager_nIsScreenSpaceContactShadowsEnabled(JNIEnv*, jclass,
+        jlong nativeRenderableManager, jint i) {
+    RenderableManager *rm = (RenderableManager *) nativeRenderableManager;
+    return (jboolean) rm->isScreenSpaceContactShadowsEnabled((RenderableManager::Instance) i);
+}
+
 extern "C" JNIEXPORT void JNICALL
 Java_com_google_android_filament_RenderableManager_nGetAxisAlignedBoundingBox(JNIEnv* env,
         jclass, jlong nativeRenderableManager, jint i, jfloatArray center_,
@@ -500,6 +528,13 @@ Java_com_google_android_filament_RenderableManager_nSetBlendOrderAt(JNIEnv*, jcl
             (uint16_t) blendOrder);
 }
 
+extern "C" JNIEXPORT jint JNICALL
+Java_com_google_android_filament_RenderableManager_nGetBlendOrderAt(JNIEnv*, jclass,
+        jlong nativeRenderableManager, jint i, jint primitiveIndex) {
+    RenderableManager *rm = (RenderableManager *) nativeRenderableManager;
+    return (jint) rm->getBlendOrderAt((RenderableManager::Instance) i, (size_t) primitiveIndex);
+}
+
 extern "C" JNIEXPORT void JNICALL
 Java_com_google_android_filament_RenderableManager_nSetGlobalBlendOrderEnabledAt(JNIEnv*, jclass,
         jlong nativeRenderableManager, jint i, jint primitiveIndex, jboolean enabled) {
@@ -508,6 +543,13 @@ Java_com_google_android_filament_RenderableManager_nSetGlobalBlendOrderEnabledAt
             (bool) enabled);
 }
 
+extern "C" JNIEXPORT jboolean JNICALL
+Java_com_google_android_filament_RenderableManager_nIsGlobalBlendOrderEnabledAt(JNIEnv*, jclass,
+        jlong nativeRenderableManager, jint i, jint primitiveIndex) {
+    RenderableManager *rm = (RenderableManager *) nativeRenderableManager;
+    return (jboolean) rm->isGlobalBlendOrderEnabledAt((RenderableManager::Instance) i, (size_t) primitiveIndex);
+}
+
 extern "C" JNIEXPORT jint JNICALL
 Java_com_google_android_filament_RenderableManager_nGetEnabledAttributesAt(JNIEnv*, jclass,
         jlong nativeRenderableManager, jint i, jint primitiveIndex) {

android/filament-android/src/main/cpp/SkyBox.cpp

@@ -63,6 +63,14 @@ Java_com_google_android_filament_Skybox_nBuilderColor(JNIEnv *,  jclass,
     builder->color({r, g, b, a});
 }
 
+extern "C"
+JNIEXPORT void JNICALL
+Java_com_google_android_filament_Skybox_nBuilderPriority(JNIEnv *,  jclass,
+        jlong nativeSkyBoxBuilder, jint priority) {
+    Skybox::Builder *builder = (Skybox::Builder *) nativeSkyBoxBuilder;
+    builder->priority(uint8_t(priority));
+}
+
 extern "C" JNIEXPORT jlong JNICALL
 Java_com_google_android_filament_Skybox_nBuilderBuild(JNIEnv *env, jclass type,
         jlong nativeSkyBoxBuilder, jlong nativeEngine) {

android/filament-android/src/main/cpp/Texture.cpp

@@ -21,6 +21,11 @@
 
 #ifdef __ANDROID__
 #include <android/bitmap.h>
+#include <android/hardware_buffer_jni.h>
+#include <backend/platforms/PlatformEGLAndroid.h>
+#   if FILAMENT_SUPPORTS_VULKAN
+#       include <backend/platforms/VulkanPlatformAndroid.h>
+#   endif
 #endif
 
 #include <filament/Engine.h>
@@ -168,6 +173,13 @@ Java_com_google_android_filament_Texture_nBuilderSwizzle(JNIEnv *, jclass ,
             (Texture::Swizzle)r, (Texture::Swizzle)g, (Texture::Swizzle)b, (Texture::Swizzle)a);
 }
 
+extern "C" JNIEXPORT void JNICALL
+Java_com_google_android_filament_Texture_nBuilderSamples(JNIEnv*, jclass,
+        jlong nativeBuilder, jint samples) {
+    Texture::Builder *builder = (Texture::Builder *) nativeBuilder;
+    builder->samples((uint8_t) samples);
+}
+
 extern "C"
 JNIEXPORT void JNICALL
 Java_com_google_android_filament_Texture_nBuilderImportTexture(JNIEnv*, jclass, jlong nativeBuilder, jlong id) {
@@ -388,6 +400,57 @@ Java_com_google_android_filament_Texture_nSetExternalImage(JNIEnv*, jclass, jlon
     texture->setExternalImage(*engine, (void*)eglImage);
 }
 
+extern "C"
+JNIEXPORT jboolean JNICALL
+Java_com_google_android_filament_Texture_nSetExternalImageByAHB(JNIEnv *env, jclass clazz,
+        jlong nativeTexture, jlong nativeEngine, jobject ahb) {
+    Texture *texture = (Texture *) nativeTexture;
+    Engine *engine = (Engine *) nativeEngine;
+
+#ifdef __ANDROID__
+    Platform* platform = engine->getPlatform();
+    AHardwareBuffer* nativeBuffer = nullptr;
+    if (__builtin_available(android 26, *)) {
+        nativeBuffer = AHardwareBuffer_fromHardwareBuffer(env, ahb);
+    }
+    if (!nativeBuffer) {
+        // either we're not on Android 26, or ahb wasn't a AHardwareBuffer
+        return JNI_FALSE;
+    }
+
+    if (engine->getBackend() == Backend::OPENGL) {
+        // CAVEAT: we assume that Backend::OPENGL on Android implies PlatformEGLAndroid.
+#if UTILS_HAS_RTTI
+        if (!dynamic_cast<PlatformEGLAndroid*>(platform)) {
+            return JNI_FALSE;
+        }
+#endif
+        auto* eglPlatform = (PlatformEGLAndroid*) platform;
+        auto ref = eglPlatform->createExternalImage(nativeBuffer, false);
+        texture->setExternalImage(*engine, ref);
+    }
+
+#if FILAMENT_SUPPORTS_VULKAN
+    else if (engine->getBackend() == Backend::VULKAN) {
+        // CAVEAT: we assume that Backend::VULKAN on Android implies VulkanPlatformAndroid.
+#if UTILS_HAS_RTTI
+        if (!dynamic_cast<VulkanPlatformAndroid*>(platform)) {
+            return JNI_FALSE;
+        }
+#endif
+        auto* vulkanPlatform = (VulkanPlatformAndroid*) platform;
+        auto ref = vulkanPlatform->createExternalImage(nativeBuffer, false);
+        texture->setExternalImage(*engine, ref);
+    }
+#endif // FILAMENT_SUPPORTS_VULKAN
+    // success!
+    return JNI_TRUE;
+#else
+    // other platforms could come here
+    return JNI_FALSE;
+#endif // __ANDROID__
+}
+
 extern "C" JNIEXPORT void JNICALL
 Java_com_google_android_filament_Texture_nSetExternalStream(JNIEnv*, jclass,
         jlong nativeTexture, jlong nativeEngine, jlong nativeStream) {
@@ -607,3 +670,4 @@ Java_com_google_android_filament_android_TextureHelper_nSetBitmapWithCallback(JN
 }
 
 #endif
+

android/filament-android/src/main/cpp/ToneMapper.cpp

@@ -52,6 +52,11 @@ Java_com_google_android_filament_ToneMapper_nCreatePBRNeutralToneMapper(JNIEnv*,
     return (jlong) new PBRNeutralToneMapper();
 }
 
+extern "C" JNIEXPORT jlong JNICALL
+Java_com_google_android_filament_ToneMapper_nCreateGT7ToneMapper(JNIEnv*, jclass) {
+    return (jlong) new GT7ToneMapper();
+}
+
 extern "C" JNIEXPORT jlong JNICALL
 Java_com_google_android_filament_ToneMapper_nCreateAgxToneMapper(JNIEnv*, jclass, jint look) {
     return (jlong) new AgxToneMapper(AgxToneMapper::AgxLook(look));

android/filament-android/src/main/cpp/View.cpp

@@ -76,6 +76,12 @@ Java_com_google_android_filament_View_nSetVisibleLayers(JNIEnv*, jclass, jlong n
     view->setVisibleLayers((uint8_t) select, (uint8_t) value);
 }
 
+extern "C" JNIEXPORT jint JNICALL
+Java_com_google_android_filament_View_nGetVisibleLayers(JNIEnv*, jclass, jlong nativeView) {
+    View* view = (View*) nativeView;
+    return view->getVisibleLayers();
+}
+
 extern "C" JNIEXPORT void JNICALL
 Java_com_google_android_filament_View_nSetShadowingEnabled(JNIEnv*, jclass, jlong nativeView, jboolean enabled) {
     View* view = (View*) nativeView;
@@ -440,6 +446,18 @@ Java_com_google_android_filament_View_nIsShadowingEnabled(JNIEnv *, jclass, jlon
     return (jboolean)view->isShadowingEnabled();
 }
 
+extern "C" JNIEXPORT void JNICALL
+Java_com_google_android_filament_View_nSetFrustumCullingEnabled(JNIEnv*, jclass, jlong nativeView, jboolean enabled) {
+    View* view = (View*) nativeView;
+    view->setFrustumCullingEnabled(enabled);
+}
+
+extern "C" JNIEXPORT jboolean JNICALL
+Java_com_google_android_filament_View_nIsFrustumCullingEnabled(JNIEnv*, jclass, jlong nativeView) {
+    View* view = (View*) nativeView;
+    return (jboolean)view->isFrustumCullingEnabled();
+}
+
 extern "C"
 JNIEXPORT void JNICALL
 Java_com_google_android_filament_View_nSetScreenSpaceRefractionEnabled(JNIEnv *, jclass,

android/filament-android/src/main/java/com/google/android/filament/Asserts.java

@@ -136,4 +136,13 @@ final class Asserts {
             throw new ArrayIndexOutOfBoundsException("Array length must be at least 4");
         }
     }
+
+    @NonNull @Size(min = 2)
+    static double[] assertDouble2(@Nullable double[] out) {
+        if (out == null) out = new double[2];
+        else if (out.length < 2) {
+            throw new ArrayIndexOutOfBoundsException("Array length must be at least 2");
+        }
+        return out;
+    }
 }

android/filament-android/src/main/java/com/google/android/filament/Camera.java

@@ -343,6 +343,27 @@ public class Camera {
         nSetScaling(getNativeObject(), xscaling, yscaling);
     }
 
+    /**
+     * Sets a custom projection matrix for each eye.
+     *
+     * @param inProjection              An array of projection matrices, one for each eye.
+     *                                  Must have at least 16 * count elements.
+     * @param count                     Number of eyes to set.
+     * @param inProjectionForCulling    Custom projection matrix for culling, must encompass all eyes.
+     * @param near                      Distance to the near plane.
+     * @param far                       Distance to the far plane.
+     */
+    public void setCustomEyeProjection(
+            @NonNull double[] inProjection, int count,
+            @NonNull @Size(min = 16) double[] inProjectionForCulling,
+            double near, double far) {
+        Asserts.assertMat4dIn(inProjectionForCulling);
+        if (inProjection.length < 16 * count) {
+            throw new IllegalArgumentException("inProjection array too small for the given count");
+        }
+        nSetCustomEyeProjection(getNativeObject(), inProjection, count, inProjectionForCulling, near, far);
+    }
+
     /**
      * Sets an additional matrix that scales the projection matrix.
      *
@@ -399,6 +420,31 @@ public class Camera {
         nSetShift(getNativeObject(), xshift, yshift);
     }
 
+    /**
+     * Returns the shift amount used to translate the projection matrix.
+     *
+     * @param out A 2-double array where the shift will be stored, or null.
+     * @return A 2-double array containing the x and y shift.
+     */
+    @NonNull @Size(min = 2)
+    public double[] getShift(@Nullable @Size(min = 2) double[] out) {
+        out = Asserts.assertDouble2(out);
+        nGetShift(getNativeObject(), out);
+        return out;
+    }
+
+    /**
+     * Returns the camera's field of view in degrees.
+     *
+     * @param direction The direction of the FOV (VERTICAL or HORIZONTAL).
+     * @return The field of view in degrees.
+     */
+    public double getFieldOfViewInDegrees(@NonNull Fov direction) {
+        return nGetFieldOfViewInDegrees(getNativeObject(), direction.ordinal());
+    }
+
+
+
     /**
      * Sets the camera's model matrix.
      * <p>
@@ -745,6 +791,17 @@ public class Camera {
         return mEntity;
     }
 
+    /**
+     * Sets the model matrix for a specific eye.
+     *
+     * @param eyeId The index of the eye.
+     * @param model The model matrix for the eye.
+     */
+    public void setEyeModelMatrix(int eyeId, @NonNull @Size(min = 16) double[] model) {
+        Asserts.assertMat4dIn(model);
+        nSetEyeModelMatrix(getNativeObject(), eyeId, model);
+    }
+
     /**
      * Helper to compute the effective focal length taking into account the focus distance
      *
@@ -784,8 +841,13 @@ public class Camera {
     private static native void nSetCustomProjection(long nativeCamera, double[] inProjection, double[] inProjectionForCulling, double near, double far);
     private static native void nSetScaling(long nativeCamera, double x, double y);
     private static native void nSetShift(long nativeCamera, double x, double y);
+    private static native void nGetShift(long nativeCamera, double[] out);
     private static native void nSetModelMatrix(long nativeCamera, float[] in);
     private static native void nSetModelMatrixFp64(long nativeCamera, double[] in);
+    private static native void nSetEyeModelMatrix(long nativeCamera, int eyeId, double[] model);
+    private static native void nSetCustomEyeProjection(long nativeCamera, double[] inProjection, int count, double[] inProjectionForCulling, double near, double far);
+    private static native double nGetFieldOfViewInDegrees(long nativeCamera, int direction);
+
     private static native void nLookAt(long nativeCamera, double eyeX, double eyeY, double eyeZ, double centerX, double centerY, double centerZ, double upX, double upY, double upZ);
     private static native double nGetNear(long nativeCamera);
     private static native double nGetCullingFar(long nativeCamera);

android/filament-android/src/main/java/com/google/android/filament/Engine.java

@@ -939,6 +939,15 @@ public class Engine {
         return nIsValidSkinningBuffer(getNativeObject(), object.getNativeObject());
     }
 
+    /**
+     * Returns whether the object is valid.
+     * @param object Object to check for validity
+     * @return returns true if the specified object is valid.
+     */
+    public boolean isValidMorphTargetBuffer(@NonNull MorphTargetBuffer object) {
+        return nIsValidMorphTargetBuffer(getNativeObject(), object.getNativeObject());
+    }
+
     /**
      * Returns whether the object is valid.
      * @param object Object to check for validity
@@ -1192,6 +1201,15 @@ public class Engine {
         skinningBuffer.clearNativeObject();
     }
 
+    /**
+     * Destroys a {@link MorphTargetBuffer} and frees all its associated resources.
+     * @param morphTargetBuffer the {@link MorphTargetBuffer} to destroy
+     */
+    public void destroyMorphTargetBuffer(@NonNull MorphTargetBuffer morphTargetBuffer) {
+        assertDestroy(nDestroyMorphTargetBuffer(getNativeObject(), morphTargetBuffer.getNativeObject()));
+        morphTargetBuffer.clearNativeObject();
+    }
+
     /**
      * Destroys a {@link IndirectLight} and frees all its associated resources.
      * @param ibl the {@link IndirectLight} to destroy
@@ -1483,6 +1501,7 @@ public class Engine {
     private static native boolean nDestroyIndexBuffer(long nativeEngine, long nativeIndexBuffer);
     private static native boolean nDestroyVertexBuffer(long nativeEngine, long nativeVertexBuffer);
     private static native boolean nDestroySkinningBuffer(long nativeEngine, long nativeSkinningBuffer);
+    private static native boolean nDestroyMorphTargetBuffer(long nativeEngine, long nativeMorphTargetBuffer);
     private static native boolean nDestroyIndirectLight(long nativeEngine, long nativeIndirectLight);
     private static native boolean nDestroyMaterial(long nativeEngine, long nativeMaterial);
     private static native boolean nDestroyMaterialInstance(long nativeEngine, long nativeMaterialInstance);
@@ -1499,6 +1518,7 @@ public class Engine {
     private static native boolean nIsValidIndexBuffer(long nativeEngine, long nativeIndexBuffer);
     private static native boolean nIsValidVertexBuffer(long nativeEngine, long nativeVertexBuffer);
     private static native boolean nIsValidSkinningBuffer(long nativeEngine, long nativeSkinningBuffer);
+    private static native boolean nIsValidMorphTargetBuffer(long nativeEngine, long nativeMorphTargetBuffer);
     private static native boolean nIsValidIndirectLight(long nativeEngine, long nativeIndirectLight);
     private static native boolean nIsValidMaterial(long nativeEngine, long nativeMaterial);
     private static native boolean nIsValidMaterialInstance(long nativeEngine, long nativeMaterial, long nativeMaterialInstance);

android/filament-android/src/main/java/com/google/android/filament/Material.java

@@ -54,6 +54,7 @@ public class Material {
         static final CullingMode[] sCullingModeValues = CullingMode.values();
         static final VertexBuffer.VertexAttribute[] sVertexAttributeValues =
                 VertexBuffer.VertexAttribute.values();
+        static final TransparencyMode[] sTransparencyModeValues = TransparencyMode.values();
     }
 
     private long mNativeObject;
@@ -160,6 +161,31 @@ public class Material {
         SCREEN,
     }
 
+    /**
+     * How transparent objects are handled
+     *
+     * @see
+     * <a href="https://google.github.io/filament/Materials.html#materialdefinitions/materialblock/blendingandtransparency:transparencymode">
+     * Blending and transparency: transparencyMode</a>
+     */
+    public enum TransparencyMode {
+        /** The transparent object is drawn honoring the raster state. */
+        DEFAULT,
+
+        /**
+         * The transparent object is first drawn in the depth buffer,
+         * then in the color buffer, honoring the culling mode, but ignoring the depth test function.
+         */
+        TWO_PASSES_ONE_SIDE,
+
+        /**
+         * The transparent object is drawn twice in the color buffer,
+         * first with back faces only, then with front faces; the culling
+         * mode is ignored. Can be combined with two-sided lighting.
+         */
+        TWO_PASSES_TWO_SIDES
+    }
+
     /**
      * Supported refraction modes
      *
@@ -261,6 +287,20 @@ public class Material {
         LOW
     }
 
+    /**
+     * Defines whether a material instance should use UBO batching or not.
+     */
+    public enum UboBatchingMode {
+        /**
+         * For default, it follows the engine settings.
+         * If UBO batching is enabled on the engine and the material domain is SURFACE, it
+         * turns on the UBO batching. Otherwise, it turns off the UBO batching.
+        */
+        DEFAULT,
+        /** Disable the Ubo Batching for this material */
+        DISABLED
+    }
+
     public static class UserVariantFilterBit {
         /** Directional lighting */
         public static int DIRECTIONAL_LIGHTING = 0x01;
@@ -372,6 +412,7 @@ public class Material {
         private int mSize;
         private int mShBandCount = 0;
         private ShadowSamplingQuality mShadowSamplingQuality = ShadowSamplingQuality.LOW;
+        private UboBatchingMode mUboBatchingMode = UboBatchingMode.DEFAULT;
 
 
         /**
@@ -416,6 +457,17 @@ public class Material {
             return this;
         }
 
+        /**
+         * Set the batching mode of the instances created from this material.
+         * @param uboBatchingMode
+         * @return Reference to this Builder for chaining calls.
+         */
+        @NonNull
+        public Builder uboBatching(UboBatchingMode mode) {
+            mUboBatchingMode = mode;
+            return this;
+        }
+
         /**
          * Creates and returns the Material object.
          *
@@ -428,7 +480,7 @@ public class Material {
         @NonNull
         public Material build(@NonNull Engine engine) {
             long nativeMaterial = nBuilderBuild(engine.getNativeObject(),
-                mBuffer, mSize, mShBandCount, mShadowSamplingQuality.ordinal());
+                mBuffer, mSize, mShBandCount, mShadowSamplingQuality.ordinal(), mUboBatchingMode.ordinal());
             if (nativeMaterial == 0) throw new IllegalStateException("Couldn't create Material");
             return new Material(nativeMaterial);
         }
@@ -561,6 +613,18 @@ public class Material {
         return EnumCache.sBlendingModeValues[nGetBlendingMode(getNativeObject())];
     }
 
+    /**
+     * Returns the transparency mode of this material.
+     * This value only makes sense when the blending mode is transparent or fade.
+     *
+     * @see
+     * <a href="https://google.github.io/filament/Materials.html#materialdefinitions/materialblock/blendingandtransparency:transparencymode">
+     * Blending and transparency: transparencyMode</a>
+     */
+    public TransparencyMode getTransparencyMode() {
+        return EnumCache.sTransparencyModeValues[nGetTransparencyMode(getNativeObject())];
+    }
+
     /**
      * Returns the refraction mode of this material.
      *
@@ -1094,7 +1158,7 @@ public class Material {
         mNativeObject = 0;
     }
 
-    private static native long nBuilderBuild(long nativeEngine, @NonNull Buffer buffer, int size, int shBandCount, int shadowQuality);
+    private static native long nBuilderBuild(long nativeEngine, @NonNull Buffer buffer, int size, int shBandCount, int shadowQuality, int uboBatchingMode);
     private static native long nCreateInstance(long nativeMaterial);
     private static native long nCreateInstanceWithName(long nativeMaterial, @NonNull String name);
     private static native long nGetDefaultInstance(long nativeMaterial);
@@ -1104,6 +1168,7 @@ public class Material {
     private static native int nGetShading(long nativeMaterial);
     private static native int nGetInterpolation(long nativeMaterial);
     private static native int nGetBlendingMode(long nativeMaterial);
+    private static native int nGetTransparencyMode(long nativeMaterial);
     private static native int nGetVertexDomain(long nativeMaterial);
     private static native int nGetCullingMode(long nativeMaterial);
     private static native boolean nIsColorWriteEnabled(long nativeMaterial);

android/filament-android/src/main/java/com/google/android/filament/MaterialInstance.java

@@ -537,6 +537,14 @@ public class MaterialInstance {
         nSetDoubleSided(getNativeObject(), doubleSided);
     }
 
+    /**
+     * Sets the transparency mode for this material instance.
+     * @see Material.TransparencyMode
+     */
+    public void setTransparencyMode(@NonNull Material.TransparencyMode mode) {
+        nSetTransparencyMode(getNativeObject(), mode.ordinal());
+    }
+
     /**
      * Returns whether double-sided lighting is enabled when the parent Material has double-sided
      * capability.
@@ -545,6 +553,14 @@ public class MaterialInstance {
         return nIsDoubleSided(getNativeObject());
     }
 
+    /**
+     * Returns the transparency mode.
+     */
+    @NonNull
+    public Material.TransparencyMode getTransparencyMode() {
+        return Material.EnumCache.sTransparencyModeValues[nGetTransparencyMode(getNativeObject())];
+    }
+
     /**
      * Overrides the default triangle culling state that was set on the material.
      *
@@ -982,4 +998,6 @@ public class MaterialInstance {
     private static native boolean nIsStencilWriteEnabled(long nativeMaterialInstance);
     private static native boolean nIsDepthCullingEnabled(long nativeMaterialInstance);
     private static native int nGetDepthFunc(long nativeMaterialInstance);
+    private static native void nSetTransparencyMode(long nativeMaterialInstance, int mode);
+    private static native int nGetTransparencyMode(long nativeMaterialInstance);
 }

android/filament-android/src/main/java/com/google/android/filament/MorphTargetBuffer.java

@@ -64,6 +64,45 @@ public class MorphTargetBuffer {
             return this;
         }
 
+        /**
+         * Use this method to enable or disable the built-in position morphing buffer.
+         * Default is true.
+         *
+         * @param enabled true to enable, false to disable
+         * @return this <code>Builder</code> object for chaining calls
+         */
+        @NonNull
+        public Builder withPositions(boolean enabled) {
+            nBuilderWithPositions(mNativeBuilder, enabled);
+            return this;
+        }
+
+        /**
+         * Use this method to enable or disable the built-in tangent morphing buffer.
+         * Default is true.
+         *
+         * @param enabled true to enable, false to disable
+         * @return this <code>Builder</code> object for chaining calls
+         */
+        @NonNull
+        public Builder withTangents(boolean enabled) {
+            nBuilderWithTangents(mNativeBuilder, enabled);
+            return this;
+        }
+
+        /**
+         * Use this method to enable or disable custom morphing.
+         * Default is false.
+         *
+         * @param enabled true to enable, false to disable
+         * @return this <code>Builder</code> object for chaining calls
+         */
+        @NonNull
+        public Builder enableCustomMorphing(boolean enabled) {
+            nBuilderEnableCustomMorphing(mNativeBuilder, enabled);
+            return this;
+        }
+
         /**
          * Creates and returns the <code>MorphTargetBuffer</code> object.
          *
@@ -156,6 +195,27 @@ public class MorphTargetBuffer {
         return nGetCount(mNativeObject);
     }
 
+    /**
+     * @return true if this MorphTargetBuffer has a position buffer.
+     */
+    public boolean hasPositions() {
+        return nHasPositions(mNativeObject);
+    }
+
+    /**
+     * @return true if this MorphTargetBuffer has a tangent buffer.
+     */
+    public boolean hasTangents() {
+        return nHasTangents(mNativeObject);
+    }
+
+    /**
+     * @return true if custom morphing is enabled.
+     */
+    public boolean isCustomMorphingEnabled() {
+        return nIsCustomMorphingEnabled(mNativeObject);
+    }
+
     public long getNativeObject() {
         if (mNativeObject == 0) {
             throw new IllegalStateException("Calling method on destroyed MorphTargetBuffer");
@@ -171,10 +231,16 @@ public class MorphTargetBuffer {
     private static native void nDestroyBuilder(long nativeBuilder);
     private static native void nBuilderVertexCount(long nativeBuilder, int vertexCount);
     private static native void nBuilderCount(long nativeBuilder, int count);
+    private static native void nBuilderWithPositions(long nativeBuilder, boolean enabled);
+    private static native void nBuilderWithTangents(long nativeBuilder, boolean enabled);
+    private static native void nBuilderEnableCustomMorphing(long nativeBuilder, boolean enabled);
     private static native long nBuilderBuild(long nativeBuilder, long nativeEngine);
 
     private static native int nSetPositionsAt(long nativeObject, long nativeEngine, int targetIndex, float[] positions, int count);
     private static native int nSetTangentsAt(long nativeObject, long nativeEngine, int targetIndex, short[] tangents, int count);
     private static native int nGetVertexCount(long nativeObject);
     private static native int nGetCount(long nativeObject);
+    private static native boolean nHasPositions(long nativeObject);
+    private static native boolean nHasTangents(long nativeObject);
+    private static native boolean nIsCustomMorphingEnabled(long nativeObject);
 }

android/filament-android/src/main/java/com/google/android/filament/RenderableManager.java

@@ -346,8 +346,8 @@ public class RenderableManager {
          *
          * @return Builder reference for chaining calls.
          *
-         * @see Builder::blendOrder()
-         * @see Builder::priority()
+         * @see Builder#blendOrder()
+         * @see Builder#priority()
          * @see RenderableManager::setBlendOrderAt()
          */
         @NonNull
@@ -725,6 +725,10 @@ public class RenderableManager {
         nSetPriority(mNativeObject, i, priority);
     }
 
+    public int getPriority(@EntityInstance int i) {
+        return nGetPriority(mNativeObject, i);
+    }
+
     /**
      * Changes the channel of a renderable
      *
@@ -734,6 +738,10 @@ public class RenderableManager {
         nSetChannel(mNativeObject, i, channel);
     }
 
+    public int getChannel(@EntityInstance int i) {
+        return nGetChannel(mNativeObject, i);
+    }
+
     /**
      * Changes whether or not frustum culling is on.
      *
@@ -743,6 +751,10 @@ public class RenderableManager {
         nSetCulling(mNativeObject, i, enabled);
     }
 
+    public boolean isCullingEnabled(@EntityInstance int i) {
+        return nIsCullingEnabled(mNativeObject, i);
+    }
+
     /**
      * Changes whether or not the large-scale fog is applied to this renderable
      * @see Builder#fog
@@ -812,6 +824,10 @@ public class RenderableManager {
         nSetScreenSpaceContactShadows(mNativeObject, i, enabled);
     }
 
+    public boolean isScreenSpaceContactShadowsEnabled(@EntityInstance int i) {
+        return nIsScreenSpaceContactShadowsEnabled(mNativeObject, i);
+    }
+
     /**
      * Checks if the renderable can cast shadows.
      *
@@ -932,6 +948,10 @@ public class RenderableManager {
         nSetBlendOrderAt(mNativeObject, instance, primitiveIndex, blendOrder);
     }
 
+    public int getBlendOrderAt(@EntityInstance int instance, @IntRange(from = 0) int primitiveIndex) {
+        return nGetBlendOrderAt(mNativeObject, instance, primitiveIndex);
+    }
+
     /**
      * Changes whether the blend order is global or local to this Renderable (by default).
      *
@@ -946,6 +966,10 @@ public class RenderableManager {
         nSetGlobalBlendOrderEnabledAt(mNativeObject, instance, primitiveIndex, enabled);
     }
 
+    public boolean isGlobalBlendOrderEnabledAt(@EntityInstance int instance, @IntRange(from = 0) int primitiveIndex) {
+        return nIsGlobalBlendOrderEnabledAt(mNativeObject, instance, primitiveIndex);
+    }
+
     /**
      * Retrieves the set of enabled attribute slots in the given primitive's VertexBuffer.
      */
@@ -1013,8 +1037,11 @@ public class RenderableManager {
     private static native void nSetAxisAlignedBoundingBox(long nativeRenderableManager, int i, float cx, float cy, float cz, float ex, float ey, float ez);
     private static native void nSetLayerMask(long nativeRenderableManager, int i, int select, int value);
     private static native void nSetPriority(long nativeRenderableManager, int i, int priority);
+    private static native int nGetPriority(long nativeRenderableManager, int i);
     private static native void nSetChannel(long nativeRenderableManager, int i, int channel);
+    private static native int nGetChannel(long nativeRenderableManager, int i);
     private static native void nSetCulling(long nativeRenderableManager, int i, boolean enabled);
+    private static native boolean nIsCullingEnabled(long nativeRenderableManager, int i);
     private static native void nSetFogEnabled(long nativeRenderableManager, int i, boolean enabled);
     private static native boolean nGetFogEnabled(long nativeRenderableManager, int i);
     private static native void nSetLightChannel(long nativeRenderableManager, int i, int channel, boolean enable);
@@ -1022,6 +1049,7 @@ public class RenderableManager {
     private static native void nSetCastShadows(long nativeRenderableManager, int i, boolean enabled);
     private static native void nSetReceiveShadows(long nativeRenderableManager, int i, boolean enabled);
     private static native void nSetScreenSpaceContactShadows(long nativeRenderableManager, int i, boolean enabled);
+    private static native boolean nIsScreenSpaceContactShadowsEnabled(long nativeRenderableManager, int i);
     private static native boolean nIsShadowCaster(long nativeRenderableManager, int i);
     private static native boolean nIsShadowReceiver(long nativeRenderableManager, int i);
     private static native void nGetAxisAlignedBoundingBox(long nativeRenderableManager, int i, float[] center, float[] halfExtent);
@@ -1032,6 +1060,8 @@ public class RenderableManager {
     private static native long nGetMaterialInstanceAt(long nativeRenderableManager, int i, int primitiveIndex);
     private static native void nSetGeometryAt(long nativeRenderableManager, int i, int primitiveIndex, int primitiveType, long nativeVertexBuffer, long nativeIndexBuffer, int offset, int count);
     private static native void nSetBlendOrderAt(long nativeRenderableManager, int i, int primitiveIndex, int blendOrder);
+    private static native int nGetBlendOrderAt(long nativeRenderableManager, int i, int primitiveIndex);
     private static native void nSetGlobalBlendOrderEnabledAt(long nativeRenderableManager, int i, int primitiveIndex, boolean enabled);
+    private static native boolean nIsGlobalBlendOrderEnabledAt(long nativeRenderableManager, int i, int primitiveIndex);
     private static native int nGetEnabledAttributesAt(long nativeRenderableManager, int i, int primitiveIndex);
 }

android/filament-android/src/main/java/com/google/android/filament/Skybox.java

@@ -155,6 +155,24 @@ public class Skybox {
             return this;
         }
 
+        /**
+         * Set the rendering priority of the Skybox. By default, it is set to the lowest
+         * priority (7) such that the Skybox is always rendered after the opaque objects,
+         * to reduce overdraw when depth culling is enabled.
+         *
+         * @param priority clamped to the range [0..7], defaults to 4; 7 is lowest priority
+         *                 (rendered last).
+         *
+         * @return Builder reference for chaining calls.
+         *
+         * @see RenderableManager.Builder#priority
+         */
+        @NonNull
+        public Builder priority(@IntRange(from = 0, to = 7) int priority) {
+            nBuilderPriority(mNativeBuilder, priority);
+            return this;
+        }
+
         /**
          * Creates a <code>Skybox</code> object
          *
@@ -262,6 +280,7 @@ public class Skybox {
     private static native void nBuilderShowSun(long nativeSkyboxBuilder, boolean show);
     private static native void nBuilderIntensity(long nativeSkyboxBuilder, float intensity);
     private static native void nBuilderColor(long nativeSkyboxBuilder, float r, float g, float b, float a);
+    private static native void nBuilderPriority(long nativeSkyboxBuilder, int priority);
     private static native long nBuilderBuild(long nativeSkyboxBuilder, long nativeEngine);
     private static native void nSetLayerMask(long nativeSkybox, int select, int value);
     private static native int  nGetLayerMask(long nativeSkybox);

android/filament-android/src/main/java/com/google/android/filament/Texture.java

@@ -71,6 +71,16 @@ import static com.google.android.filament.Texture.Type.COMPRESSED;
  * @see MaterialInstance#setParameter(String, Texture, TextureSampler)
  */
 public class Texture {
+
+    private static Class<?> HardwareBufferClass = null;
+
+    static {
+        try {
+            HardwareBufferClass = Class.forName("android.hardware.HardwareBuffer");
+        } catch (ClassNotFoundException ignored) {
+        }
+    }
+
     private static final Sampler[] sSamplerValues = Sampler.values();
     private static final InternalFormat[] sInternalFormatValues = InternalFormat.values();
 
@@ -785,6 +795,17 @@ public class Texture {
             return this;
         }
 
+        /**
+         * Specifies the number of samples for multisample anti-aliasing.
+         * @param samples number of samples, must be at least 1. Default is 1.
+         * @return This Builder, for chaining calls.
+         */
+        @NonNull
+        public Builder samples(@IntRange(from = 1) int samples) {
+            nBuilderSamples(mNativeBuilder, samples);
+            return this;
+        }
+
         /**
          * Specifies the texture's internal format.
          * <p>The internal format specifies how texels are stored (which may be different from how
@@ -1172,6 +1193,38 @@ public class Texture {
         nSetExternalImage(getNativeObject(), engine.getNativeObject(), eglImage);
     }
 
+    /**
+     * Specifies the external image to associate with this <code>Texture</code>.
+     *
+     * <p>Typically, the external image is OS specific, and can be a video or camera frame.
+     * There are many restrictions when using an external image as a texture, such as:</p>
+     * <ul>
+     *   <li> only the level of detail (lod) 0 can be specified</li>
+     *   <li> only nearest or linear filtering is supported</li>
+     *   <li> the size and format of the texture is defined by the external image</li>
+     *   <li> only the CLAMP_TO_EDGE wrap mode is supported</li>
+     * </ul>
+     *
+     * @param engine    {@link Engine} this texture is associated to. Must be the
+     *                  instance passed to {@link Builder#build Builder.build()}.
+     * @param externalImageRef An OS specific Object. On Android it must be a
+     *                         <code>android.hardware.HardwareBuffer</code>
+     */
+    public void setExternalImage(@NonNull Engine engine, Object externalImageRef) {
+        if (HardwareBufferClass != null) {
+            if (!HardwareBufferClass.isInstance(externalImageRef)) {
+                throw new IllegalArgumentException("externalImageRef must be a AHardwareBuffer");
+            }
+            if (!nSetExternalImageByAHB(getNativeObject(), engine.getNativeObject(), externalImageRef)) {
+                throw new IllegalStateException("Error setting AHardwareBuffer as external image");
+            }
+        } else {
+            throw new UnsupportedOperationException(
+                "setExternalImage(Engine, Object) not supported on this platform");
+        }
+    }
+
+
     /**
      * Specifies the external stream to associate with this <code>Texture</code>.
      *
@@ -1328,6 +1381,7 @@ public class Texture {
     private static native void nBuilderFormat(long nativeBuilder, int format);
     private static native void nBuilderUsage(long nativeBuilder, int flags);
     private static native void nBuilderSwizzle(long nativeBuilder, int r, int g, int b, int a);
+    private static native void nBuilderSamples(long nativeBuilder, int samples);
     private static native void nBuilderImportTexture(long nativeBuilder, long id);
     private static native void nBuilderExternal(long nativeBuilder);
     private static native long nBuilderBuild(long nativeBuilder, long nativeEngine);
@@ -1364,6 +1418,8 @@ public class Texture {
     private static native void nSetExternalImage(
             long nativeObject, long nativeEngine, long eglImage);
 
+    private static native boolean nSetExternalImageByAHB(long nativeTexture, long nativeObject, Object ahb);
+
     private static native void nSetExternalStream(long nativeTexture,
             long nativeEngine, long nativeStream);
 

android/filament-android/src/main/java/com/google/android/filament/ToneMapper.java

@@ -24,6 +24,7 @@ package com.google.android.filament;
  *   <li>ACESLegacyToneMapper</li>
  *   <li>FilmicToneMapper</li>
  *   <li>PBRNeutralToneMapper</li>
+ *   <li>GT7ToneMapper</li>
  * </ul>
  * <li>Debug/validation tone mapping operators</li>
  * <ul>
@@ -111,6 +112,19 @@ public class ToneMapper {
         }
     }
 
+    /**
+     * Gran Turismo 7 tone mapping operator. This tone mapper was designed
+     * to preserve the appearance of materials across lighting conditions while
+     * avoiding artifacts in the highlights in high dynamic range conditions.
+     * This tone mapper targets an SDR paper white value of 250 nits, with a
+     * reference luminance of 100 cd/m^2 (a value of 1.0 in the HDR framebuffer).
+     */
+    public static class GT7ToneMapper extends ToneMapper {
+        public GT7ToneMapper() {
+            super(nCreateGT7ToneMapper());
+        }
+    }
+
     /**
      * AgX tone mapping operator.
      */
@@ -244,6 +258,7 @@ public class ToneMapper {
     private static native long nCreateACESLegacyToneMapper();
     private static native long nCreateFilmicToneMapper();
     private static native long nCreatePBRNeutralToneMapper();
+    private static native long nCreateGT7ToneMapper();
     private static native long nCreateAgxToneMapper(int look);
     private static native long nCreateGenericToneMapper(
             float contrast, float midGrayIn, float midGrayOut, float hdrMax);

android/filament-android/src/main/java/com/google/android/filament/View.java

@@ -350,6 +350,26 @@ public class View {
         nSetVisibleLayers(getNativeObject(), select & 0xFF, values & 0xFF);
     }
 
+    /**
+     * Returns the visible layers.
+     *
+     * @return a bitmask specifying which layer is visible.
+     */
+    public int getVisibleLayers() {
+        return nGetVisibleLayers(getNativeObject());
+    }
+
+    /**
+     * Enables or disables a specific layer.
+     *
+     * @param layer     Index of the layer to enable or disable, must be between 0 and 7.
+     * @param enabled   True to enable the layer, false to disable it.
+     */
+    public void setLayerEnabled(@IntRange(from = 0, to = 7) int layer, boolean enabled) {
+        int mask = 1 << layer;
+        setVisibleLayers(mask, enabled ? mask : 0);
+    }
+
     /**
      * Enables or disables shadow mapping. Enabled by default.
      *
@@ -368,6 +388,22 @@ public class View {
         return nIsShadowingEnabled(getNativeObject());
     }
 
+    /**
+     * Enables or disables frustum culling. Enabled by default.
+     *
+     * @param enabled true enables frustum culling, false disables it.
+     */
+    public void setFrustumCullingEnabled(boolean enabled) {
+        nSetFrustumCullingEnabled(getNativeObject(), enabled);
+    }
+
+    /**
+     * @return whether frustum culling is enabled
+     */
+    public boolean isFrustumCullingEnabled() {
+        return nIsFrustumCullingEnabled(getNativeObject());
+    }
+
     /**
      * Enables or disables screen space refraction. Enabled by default.
      *
@@ -1322,6 +1358,9 @@ public class View {
     private static native boolean nHasCamera(long nativeView);
     private static native void nSetViewport(long nativeView, int left, int bottom, int width, int height);
     private static native void nSetVisibleLayers(long nativeView, int select, int value);
+    private static native int nGetVisibleLayers(long nativeView);
+    private static native void nSetFrustumCullingEnabled(long nativeView, boolean enabled);
+    private static native boolean nIsFrustumCullingEnabled(long nativeView);
     private static native void nSetShadowingEnabled(long nativeView, boolean enabled);
     private static native void nSetRenderTarget(long nativeView, long nativeRenderTarget);
     private static native void nSetSampleCount(long nativeView, int count);
@@ -1406,65 +1445,59 @@ public class View {
      * by lowering the resolution of a View, or to increase the quality when the
      * rendering is faster than the target frame rate.
      *
-     * This structure can be used to specify the minimum scale factor used when
+     * <p>This structure can be used to specify the minimum scale factor used when
      * lowering the resolution of a View, and the maximum scale factor used when
      * increasing the resolution for higher quality rendering. The scale factors
      * can be controlled on each X and Y axis independently. By default, all scale
-     * factors are set to 1.0.
+     * factors are set to 1.0.</p>
      *
-     * enabled:   enable or disables dynamic resolution on a View
+     * <ul>
+     * <li>enabled:   enable or disables dynamic resolution on a View</li>
      *
-     * homogeneousScaling: by default the system scales the major axis first. Set this to true
-     *                     to force homogeneous scaling.
+     * <li>homogeneousScaling: by default the system scales the major axis first. Set this to true
+     *                     to force homogeneous scaling.</li>
      *
-     * minScale:  the minimum scale in X and Y this View should use
+     * <li>minScale:  the minimum scale in X and Y this View should use</li>
      *
-     * maxScale:  the maximum scale in X and Y this View should use
+     * <li>maxScale:  the maximum scale in X and Y this View should use</li>
      *
-     * quality:   upscaling quality.
-     *            LOW: 1 bilinear tap, Medium: 4 bilinear taps, High: 9 bilinear taps (tent)
+     * <li>quality:   upscaling quality.
+     *            LOW: 1 bilinear tap, Medium: 4 bilinear taps, High: 9 bilinear taps (tent)</li>
+     * </ul>
      *
-     * \note
+     * <p>Note:
      * Dynamic resolution is only supported on platforms where the time to render
      * a frame can be measured accurately. On platforms where this is not supported,
-     * Dynamic Resolution can't be enabled unless minScale == maxScale.
+     * Dynamic Resolution can't be enabled unless <code>minScale == maxScale</code>.</p>
      *
-     * @see Renderer::FrameRateOptions
+     * @see Renderer.FrameRateOptions
      *
      */
     public static class DynamicResolutionOptions {
-        /**
-         * minimum scale factors in x and y
-         */
+        /** minimum scale factors in x and y */
         public float minScale = 0.5f;
-        /**
-         * maximum scale factors in x and y
-         */
+        /** maximum scale factors in x and y */
         public float maxScale = 1.0f;
-        /**
-         * sharpness when QualityLevel::MEDIUM or higher is used [0 (disabled), 1 (sharpest)]
-         */
+        /** sharpness when QualityLevel::MEDIUM or higher is used [0 (disabled), 1 (sharpest)] */
         public float sharpness = 0.9f;
-        /**
-         * enable or disable dynamic resolution
-         */
+        /** enable or disable dynamic resolution */
         public boolean enabled = false;
-        /**
-         * set to true to force homogeneous scaling
-         */
+        /** set to true to force homogeneous scaling */
         public boolean homogeneousScaling = false;
         /**
          * Upscaling quality
-         * LOW:    bilinear filtered blit. Fastest, poor quality
-         * MEDIUM: Qualcomm Snapdragon Game Super Resolution (SGSR) 1.0
-         * HIGH:   AMD FidelityFX FSR1 w/ mobile optimizations
-         * ULTRA:  AMD FidelityFX FSR1
+         * <ul>
+         * <li>LOW:    bilinear filtered blit. Fastest, poor quality</li>
+         * <li>MEDIUM: Qualcomm Snapdragon Game Super Resolution (SGSR) 1.0</li>
+         * <li>HIGH:   AMD FidelityFX FSR1 w/ mobile optimizations</li>
+         * <li>ULTRA:  AMD FidelityFX FSR1</li>
+         * </ul>
          *      FSR1 and SGSR require a well anti-aliased (MSAA or TAA), noise free scene.
          *      Avoid FXAA and dithering.
          *
-         * The default upscaling quality is set to LOW.
+         * <p>The default upscaling quality is set to LOW.</p>
          *
-         * caveat: currently, 'quality' is always set to LOW if the View is TRANSLUCENT.
+         * <p>caveat: currently, <code>quality</code> is always set to LOW if the View is TRANSLUCENT.</p>
          */
         @NonNull
         public QualityLevel quality = QualityLevel.LOW;
@@ -1473,134 +1506,98 @@ public class View {
     /**
      * Options to control the bloom effect
      *
-     * enabled:     Enable or disable the bloom post-processing effect. Disabled by default.
+     * <ul>
+     * <li>enabled:     Enable or disable the bloom post-processing effect. Disabled by default.</li>
      *
-     * levels:      Number of successive blurs to achieve the blur effect, the minimum is 3 and the
+     * <li>levels:      Number of successive blurs to achieve the blur effect, the minimum is 3 and the
      *              maximum is 12. This value together with resolution influences the spread of the
      *              blur effect. This value can be silently reduced to accommodate the original
-     *              image size.
+     *              image size.</li>
      *
-     * resolution:  Resolution of bloom's minor axis. The minimum value is 2^levels and the
+     * <li>resolution:  Resolution of bloom's minor axis. The minimum value is 2^levels and the
      *              the maximum is lower of the original resolution and 4096. This parameter is
      *              silently clamped to the minimum and maximum.
      *              It is highly recommended that this value be smaller than the target resolution
-     *              after dynamic resolution is applied (horizontally and vertically).
+     *              after dynamic resolution is applied (horizontally and vertically).</li>
      *
-     * strength:    how much of the bloom is added to the original image. Between 0 and 1.
+     * <li>strength:    how much of the bloom is added to the original image. Between 0 and 1.</li>
      *
-     * blendMode:   Whether the bloom effect is purely additive (false) or mixed with the original
-     *              image (true).
+     * <li>blendMode:   Whether the bloom effect is purely additive (false) or mixed with the original
+     *              image (true).</li>
      *
-     * threshold:   When enabled, a threshold at 1.0 is applied on the source image, this is
-     *              useful for artistic reasons and is usually needed when a dirt texture is used.
+     * <li>threshold:   When enabled, a threshold at 1.0 is applied on the source image, this is
+     *              useful for artistic reasons and is usually needed when a dirt texture is used.</li>
      *
-     * dirt:        A dirt/scratch/smudges texture (that can be RGB), which gets added to the
+     * <li>dirt:        A dirt/scratch/smudges texture (that can be RGB), which gets added to the
      *              bloom effect. Smudges are visible where bloom occurs. Threshold must be
-     *              enabled for the dirt effect to work properly.
+     *              enabled for the dirt effect to work properly.</li>
      *
-     * dirtStrength: Strength of the dirt texture.
+     * <li>dirtStrength: Strength of the dirt texture.</li>
+     * </ul>
      */
     public static class BloomOptions {
         public enum BlendMode {
-            /**
-             * Bloom is modulated by the strength parameter and added to the scene
-             */
+            /** Bloom is modulated by the strength parameter and added to the scene */
             ADD,
-            /**
-             * Bloom is interpolated with the scene using the strength parameter
-             */
+            /** Bloom is interpolated with the scene using the strength parameter */
             INTERPOLATE,
         }
 
-        /**
-         * user provided dirt texture
-         */
+        /** user provided dirt texture */
         @Nullable
         public Texture dirt = null;
-        /**
-         * strength of the dirt texture
-         */
+        /** strength of the dirt texture */
         public float dirtStrength = 0.2f;
-        /**
-         * bloom's strength between 0.0 and 1.0
-         */
+        /** bloom's strength between 0.0 and 1.0 */
         public float strength = 0.10f;
-        /**
-         * resolution of vertical axis (2^levels to 2048)
-         */
+        /** resolution of vertical axis (2^levels to 2048) */
         public int resolution = 384;
-        /**
-         * number of blur levels (1 to 11)
-         */
+        /** number of blur levels (1 to 11) */
         public int levels = 6;
-        /**
-         * how the bloom effect is applied
-         */
+        /** how the bloom effect is applied */
         @NonNull
         public BloomOptions.BlendMode blendMode = BloomOptions.BlendMode.ADD;
-        /**
-         * whether to threshold the source
-         */
+        /** whether to threshold the source */
         public boolean threshold = true;
-        /**
-         * enable or disable bloom
-         */
+        /** enable or disable bloom */
         public boolean enabled = false;
-        /**
-         * limit highlights to this value before bloom [10, +inf]
-         */
+        /** limit highlights to this value before bloom [10, +inf] */
         public float highlight = 1000.0f;
         /**
          * Bloom quality level.
-         * LOW (default): use a more optimized down-sampling filter, however there can be artifacts
-         *      with dynamic resolution, this can be alleviated by using the homogenous mode.
-         * MEDIUM: Good balance between quality and performance.
-         * HIGH: In this mode the bloom resolution is automatically increased to avoid artifacts.
+         * <ul>
+         * <li>LOW (default): use a more optimized down-sampling filter, however there can be artifacts
+         *      with dynamic resolution, this can be alleviated by using the homogenous mode.</li>
+         * <li>MEDIUM: Good balance between quality and performance.</li>
+         * <li>HIGH: In this mode the bloom resolution is automatically increased to avoid artifacts.
          *      This mode can be significantly slower on mobile, especially at high resolution.
-         *      This mode greatly improves the anamorphic bloom.
+         *      This mode greatly improves the anamorphic bloom.</li>
+         * </ul>
          */
         @NonNull
         public QualityLevel quality = QualityLevel.LOW;
-        /**
-         * enable screen-space lens flare
-         */
+        /** enable screen-space lens flare */
         public boolean lensFlare = false;
-        /**
-         * enable starburst effect on lens flare
-         */
+        /** enable starburst effect on lens flare */
         public boolean starburst = true;
-        /**
-         * amount of chromatic aberration
-         */
+        /** amount of chromatic aberration */
         public float chromaticAberration = 0.005f;
-        /**
-         * number of flare "ghosts"
-         */
+        /** number of flare "ghosts" */
         public int ghostCount = 4;
-        /**
-         * spacing of the ghost in screen units [0, 1[
-         */
+        /** spacing of the ghost in screen units [0, 1[ */
         public float ghostSpacing = 0.6f;
-        /**
-         * hdr threshold for the ghosts
-         */
+        /** hdr threshold for the ghosts */
         public float ghostThreshold = 10.0f;
-        /**
-         * thickness of halo in vertical screen units, 0 to disable
-         */
+        /** thickness of halo in vertical screen units, 0 to disable */
         public float haloThickness = 0.1f;
-        /**
-         * radius of halo in vertical screen units [0, 0.5]
-         */
+        /** radius of halo in vertical screen units [0, 0.5] */
         public float haloRadius = 0.4f;
-        /**
-         * hdr threshold for the halo
-         */
+        /** hdr threshold for the halo */
         public float haloThreshold = 10.0f;
     }
 
     /**
-     * Options to control large-scale fog in the scene. Materials can enable the `linearFog` property,
+     * Options to control large-scale fog in the scene. Materials can enable the <code>linearFog</code> property,
      * which uses a simplified, linear equation for fog calculation; in this mode, the heightFalloff
      * is ignored as well as the mipmap selection in IBL or skyColor mode.
      */
@@ -1614,12 +1611,12 @@ public class View {
          * This can be used to exclude the skybox, which is desirable if it already contains clouds or
          * fog. The default value is +infinity which applies the fog to everything.
          *
-         * Note: The SkyBox is typically at a distance of 1e19 in world space (depending on the near
-         * plane distance and projection used though).
+         * <p>Note: The SkyBox is typically at a distance of 1e19 in world space (depending on the near
+         * plane distance and projection used though).</p>
          */
         public float cutOffDistance = Float.POSITIVE_INFINITY;
         /**
-         * fog's maximum opacity between 0 and 1. Ignored in `linearFog` mode.
+         * fog's maximum opacity between 0 and 1. Ignored in <code>linearFog</code> mode.
          */
         public float maximumOpacity = 1.0f;
         /**
@@ -1631,11 +1628,11 @@ public class View {
          * It can be expressed as 1/H, where H is the altitude change in world units [m] that causes a
          * factor 2.78 (e) change in fog density.
          *
-         * A falloff of 0 means the fog density is constant everywhere and may result is slightly
-         * faster computations.
+         * <p>A falloff of 0 means the fog density is constant everywhere and may result is slightly
+         * faster computations.</p>
          *
-         * In `linearFog` mode, only use to compute the slope of the linear equation. Completely
-         * ignored if set to 0.
+         * <p>In <code>linearFog</code> mode, only use to compute the slope of the linear equation. Completely
+         * ignored if set to 0.</p>
          */
         public float heightFalloff = 1.0f;
         /**
@@ -1645,11 +1642,11 @@ public class View {
          *  above one are allowed but could create a non energy-conservative fog (this is dependant
          *  on the IBL's intensity as well).
          *
-         *  We assume that our fog has no absorption and therefore all the light it scatters out
+         *  <p>We assume that our fog has no absorption and therefore all the light it scatters out
          *  becomes ambient light in-scattering and has lost all directionality, i.e.: scattering is
-         *  isotropic. This somewhat simulates Rayleigh scattering.
+         *  isotropic. This somewhat simulates Rayleigh scattering.</p>
          *
-         *  This value is used as a tint instead, when fogColorFromIbl is enabled.
+         *  <p>This value is used as a tint instead, when fogColorFromIbl is enabled.</p>
          *
          *  @see #fogColorFromIbl
          */
@@ -1660,20 +1657,20 @@ public class View {
          * light is absorbed and out-scattered per unit of distance. Each unit of extinction reduces
          * the incoming light to 37% of its original value.
          *
-         * Note: The extinction factor is related to the fog density, it's usually some constant K times
+         * <p>Note: The extinction factor is related to the fog density, it's usually some constant K times
          * the density at sea level (more specifically at fog height). The constant K depends on
-         * the composition of the fog/atmosphere.
+         * the composition of the fog/atmosphere.</p>
          *
-         * For historical reason this parameter is called `density`.
+         * <p>For historical reason this parameter is called <code>density</code>.</p>
          *
-         * In `linearFog` mode this is the slope of the linear equation if heightFalloff is set to 0.
+         * <p>In <code>linearFog</code> mode this is the slope of the linear equation if heightFalloff is set to 0.
          * Otherwise, heightFalloff affects the slope calculation such that it matches the slope of
-         * the standard equation at the camera height.
+         * the standard equation at the camera height.</p>
          */
         public float density = 0.1f;
         /**
          * Distance in world units [m] from the camera where the Sun in-scattering starts.
-         * Ignored in `linearFog` mode.
+         * Ignored in <code>linearFog</code> mode.
          */
         public float inScatteringStart = 0.0f;
         /**
@@ -1681,16 +1678,16 @@ public class View {
          * is scattered (by the fog) towards the camera.
          * Size of the Sun in-scattering (>0 to activate). Good values are >> 1 (e.g. ~10 - 100).
          * Smaller values result is a larger scattering size.
-         * Ignored in `linearFog` mode.
+         * Ignored in <code>linearFog</code> mode.
          */
         public float inScatteringSize = -1.0f;
         /**
-         * The fog color will be sampled from the IBL in the view direction and tinted by `color`.
+         * The fog color will be sampled from the IBL in the view direction and tinted by <code>color</code>.
          * Depending on the scene this can produce very convincing results.
          *
-         * This simulates a more anisotropic phase-function.
+         * <p>This simulates a more anisotropic phase-function.</p>
          *
-         * `fogColorFromIbl` is ignored when skyTexture is specified.
+         * <p><code>fogColorFromIbl</code> is ignored when skyTexture is specified.</p>
          *
          * @see #skyColor
          */
@@ -1703,11 +1700,11 @@ public class View {
          * level with a strong gaussian filter or even an irradiance filter and then generate mip
          * levels as usual. How blurred the base level is somewhat of an artistic decision.
          *
-         * This simulates a more anisotropic phase-function.
+         * <p>This simulates a more anisotropic phase-function.</p>
          *
-         * `fogColorFromIbl` is ignored when skyTexture is specified.
+         * <p><code>fogColorFromIbl</code> is ignored when skyTexture is specified.</p>
          *
-         * In `linearFog` mode mipmap level 0 is always used.
+         * <p>In <code>linearFog</code> mode mipmap level 0 is always used.</p>
          *
          * @see Texture
          * @see #fogColorFromIbl
@@ -1723,9 +1720,9 @@ public class View {
     /**
      * Options to control Depth of Field (DoF) effect in the scene.
      *
-     * cocScale can be used to set the depth of field blur independently of the camera
+     * <p>cocScale can be used to set the depth of field blur independently of the camera
      * aperture, e.g. for artistic reasons. This can be achieved by setting:
-     *      cocScale = cameraAperture / desiredDoFAperture
+     *      cocScale = cameraAperture / desiredDoFAperture</p>
      *
      * @see Camera
      */
@@ -1736,59 +1733,24 @@ public class View {
             MEDIAN,
         }
 
-        /**
-         * circle of confusion scale factor (amount of blur)
-         */
+        /** circle of confusion scale factor (amount of blur) */
         public float cocScale = 1.0f;
-        /**
-         * width/height aspect ratio of the circle of confusion (simulate anamorphic lenses)
-         */
+        /** width/height aspect ratio of the circle of confusion (simulate anamorphic lenses) */
         public float cocAspectRatio = 1.0f;
-        /**
-         * maximum aperture diameter in meters (zero to disable rotation)
-         */
+        /** maximum aperture diameter in meters (zero to disable rotation) */
         public float maxApertureDiameter = 0.01f;
-        /**
-         * enable or disable depth of field effect
-         */
+        /** enable or disable depth of field effect */
         public boolean enabled = false;
-        /**
-         * filter to use for filling gaps in the kernel
-         */
+        /** filter to use for filling gaps in the kernel */
         @NonNull
         public DepthOfFieldOptions.Filter filter = DepthOfFieldOptions.Filter.MEDIAN;
-        /**
-         * perform DoF processing at native resolution
-         */
+        /** perform DoF processing at native resolution */
         public boolean nativeResolution = false;
-        /**
-         * Number of of rings used by the gather kernels. The number of rings affects quality
-         * and performance. The actual number of sample per pixel is defined
-         * as (ringCount * 2 - 1)^2. Here are a few commonly used values:
-         *       3 rings :   25 ( 5x 5 grid)
-         *       4 rings :   49 ( 7x 7 grid)
-         *       5 rings :   81 ( 9x 9 grid)
-         *      17 rings : 1089 (33x33 grid)
-         *
-         * With a maximum circle-of-confusion of 32, it is never necessary to use more than 17 rings.
-         *
-         * Usually all three settings below are set to the same value, however, it is often
-         * acceptable to use a lower ring count for the "fast tiles", which improves performance.
-         * Fast tiles are regions of the screen where every pixels have a similar
-         * circle-of-confusion radius.
-         *
-         * A value of 0 means default, which is 5 on desktop and 3 on mobile.
-         *
-         * @{
-         */
+        /** number of kernel rings for foreground tiles */
         public int foregroundRingCount = 0;
-        /**
-         * number of kernel rings for background tiles
-         */
+        /** number of kernel rings for background tiles */
         public int backgroundRingCount = 0;
-        /**
-         * number of kernel rings for fast tiles
-         */
+        /** number of kernel rings for fast tiles */
         public int fastGatherRingCount = 0;
         /**
          * maximum circle-of-confusion in pixels for the foreground, must be in [0, 32] range.
@@ -1806,26 +1768,16 @@ public class View {
      * Options to control the vignetting effect.
      */
     public static class VignetteOptions {
-        /**
-         * high values restrict the vignette closer to the corners, between 0 and 1
-         */
+        /** high values restrict the vignette closer to the corners, between 0 and 1 */
         public float midPoint = 0.5f;
-        /**
-         * controls the shape of the vignette, from a rounded rectangle (0.0), to an oval (0.5), to a circle (1.0)
-         */
+        /** controls the shape of the vignette, from a rounded rectangle (0.0), to an oval (0.5), to a circle (1.0) */
         public float roundness = 0.5f;
-        /**
-         * softening amount of the vignette effect, between 0 and 1
-         */
+        /** softening amount of the vignette effect, between 0 and 1 */
         public float feather = 0.5f;
-        /**
-         * color of the vignette effect, alpha is currently ignored
-         */
+        /** color of the vignette effect, alpha is currently ignored */
         @NonNull @Size(min = 4)
         public float[] color = {0.0f, 0.0f, 0.0f, 1.0f};
-        /**
-         * enables or disables the vignette effect
-         */
+        /** enables or disables the vignette effect */
         public boolean enabled = false;
     }
 
@@ -1839,11 +1791,11 @@ public class View {
         /**
          * Sets the quality of the HDR color buffer.
          *
-         * A quality of HIGH or ULTRA means using an RGB16F or RGBA16F color buffer. This means
+         * <p>A quality of HIGH or ULTRA means using an RGB16F or RGBA16F color buffer. This means
          * colors in the LDR range (0..1) have a 10 bit precision. A quality of LOW or MEDIUM means
          * using an R11G11B10F opaque color buffer or an RGBA16F transparent color buffer. With
          * R11G11B10F colors in the LDR range have a precision of either 6 bits (red and green
-         * channels) or 5 bits (blue channel).
+         * channels) or 5 bits (blue channel).</p>
          */
         @NonNull
         public QualityLevel hdrColorBuffer = QualityLevel.HIGH;
@@ -1855,72 +1807,44 @@ public class View {
      */
     public static class AmbientOcclusionOptions {
         public enum AmbientOcclusionType {
-            /**
-             * use Scalable Ambient Occlusion
-             */
+            /** use Scalable Ambient Occlusion */
             SAO,
-            /**
-             * use Ground Truth-Based Ambient Occlusion
-             */
+            /** use Ground Truth-Based Ambient Occlusion */
             GTAO,
         }
 
-        /**
-         * Type of ambient occlusion algorithm.
-         */
+        /** Type of ambient occlusion algorithm. */
         @NonNull
         public AmbientOcclusionOptions.AmbientOcclusionType aoType = AmbientOcclusionOptions.AmbientOcclusionType.SAO;
-        /**
-         * Ambient Occlusion radius in meters, between 0 and ~10.
-         */
+        /** Ambient Occlusion radius in meters, between 0 and ~10. */
         public float radius = 0.3f;
-        /**
-         * Controls ambient occlusion's contrast. Must be positive.
-         */
+        /** Controls ambient occlusion's contrast. Must be positive. */
         public float power = 1.0f;
         /**
          * Self-occlusion bias in meters. Use to avoid self-occlusion.
          * Between 0 and a few mm. No effect when aoType set to GTAO
          */
         public float bias = 0.0005f;
-        /**
-         * How each dimension of the AO buffer is scaled. Must be either 0.5 or 1.0.
-         */
+        /** How each dimension of the AO buffer is scaled. Must be either 0.5 or 1.0. */
         public float resolution = 0.5f;
-        /**
-         * Strength of the Ambient Occlusion effect.
-         */
+        /** Strength of the Ambient Occlusion effect. */
         public float intensity = 1.0f;
-        /**
-         * depth distance that constitute an edge for filtering
-         */
+        /** depth distance that constitute an edge for filtering */
         public float bilateralThreshold = 0.05f;
-        /**
-         * affects # of samples used for AO and params for filtering
-         */
+        /** affects # of samples used for AO and params for filtering */
         @NonNull
         public QualityLevel quality = QualityLevel.LOW;
-        /**
-         * affects AO smoothness. Recommend setting to HIGH when aoType set to GTAO.
-         */
+        /** affects AO smoothness. Recommend setting to HIGH when aoType set to GTAO. */
         @NonNull
         public QualityLevel lowPassFilter = QualityLevel.MEDIUM;
-        /**
-         * affects AO buffer upsampling quality
-         */
+        /** affects AO buffer upsampling quality */
         @NonNull
         public QualityLevel upsampling = QualityLevel.LOW;
-        /**
-         * enables or disables screen-space ambient occlusion
-         */
+        /** enables or disables screen-space ambient occlusion */
         public boolean enabled = false;
-        /**
-         * enables bent normals computation from AO, and specular AO
-         */
+        /** enables bent normals computation from AO, and specular AO */
         public boolean bentNormals = false;
-        /**
-         * min angle in radian to consider. No effect when aoType set to GTAO.
-         */
+        /** min angle in radian to consider. No effect when aoType set to GTAO. */
         public float minHorizonAngleRad = 0.0f;
         /**
          * Screen Space Cone Tracing (SSCT) options
@@ -2006,12 +1930,10 @@ public class View {
      * @see #setMultiSampleAntiAliasingOptions
      */
     public static class MultiSampleAntiAliasingOptions {
-        /**
-         * enables or disables msaa
-         */
+        /** enables or disables msaa */
         public boolean enabled = false;
         /**
-         * sampleCount number of samples to use for multi-sampled anti-aliasing.\n
+         * sampleCount number of samples to use for multi-sampled anti-aliasing.<br>
          *              0: treated as 1
          *              1: no anti-aliasing
          *              n: sample count. Effective sample could be different depending on the
@@ -2030,106 +1952,75 @@ public class View {
      * shaders to be recompiled. These options should be changed or set during initialization.
      * `filterWidth`, `feedback` and `jitterPattern`, however, can be changed at any time.
      *
-     * `feedback` of 0.1 effectively accumulates a maximum of 19 samples in steady state.
-     * see "A Survey of Temporal Antialiasing Techniques" by Lei Yang and all for more information.
+     * <p><code>feedback</code> of 0.1 effectively accumulates a maximum of 19 samples in steady state.
+     * see "A Survey of Temporal Antialiasing Techniques" by Lei Yang and all for more information.</p>
      *
      * @see #setTemporalAntiAliasingOptions
      */
     public static class TemporalAntiAliasingOptions {
         public enum BoxType {
-            /**
-             * use an AABB neighborhood
-             */
+            /** use an AABB neighborhood */
             AABB,
-            /**
-             * use the variance of the neighborhood (not recommended)
-             */
-            VARIANCE,
-            /**
-             * use both AABB and variance
-             */
+            /** use both AABB and variance */
             AABB_VARIANCE,
         }
 
         public enum BoxClipping {
-            /**
-             * Accurate box clipping
-             */
+            /** Accurate box clipping */
             ACCURATE,
-            /**
-             * clamping
-             */
+            /** clamping */
             CLAMP,
-            /**
-             * no rejections (use for debugging)
-             */
+            /** no rejections (use for debugging) */
             NONE,
         }
 
         public enum JitterPattern {
+            /** 4-samples, rotated grid sampling */
             RGSS_X4,
+            /** 4-samples, uniform grid in helix sequence */
             UNIFORM_HELIX_X4,
+            /** 8-samples of halton 2,3 */
             HALTON_23_X8,
+            /** 16-samples of halton 2,3 */
             HALTON_23_X16,
+            /** 32-samples of halton 2,3 */
             HALTON_23_X32,
         }
 
-        /**
-         * reconstruction filter width typically between 1 (sharper) and 2 (smoother)
-         */
+        /** @deprecated has no effect. */
         public float filterWidth = 1.0f;
-        /**
-         * history feedback, between 0 (maximum temporal AA) and 1 (no temporal AA).
-         */
+        /** history feedback, between 0 (maximum temporal AA) and 1 (no temporal AA). */
         public float feedback = 0.12f;
-        /**
-         * texturing lod bias (typically -1 or -2)
-         */
+        /** texturing lod bias (typically -1 or -2) */
         public float lodBias = -1.0f;
-        /**
-         * post-TAA sharpen, especially useful when upscaling is true.
-         */
+        /** post-TAA sharpen, especially useful when upscaling is true. */
         public float sharpness = 0.0f;
-        /**
-         * enables or disables temporal anti-aliasing
-         */
+        /** enables or disables temporal anti-aliasing */
         public boolean enabled = false;
-        /**
-         * 4x TAA upscaling. Disables Dynamic Resolution. [BETA]
-         */
-        public boolean upscaling = false;
-        /**
-         * whether to filter the history buffer
-         */
+        /** Upscaling factor. Disables Dynamic Resolution. [BETA] */
+        public float upscaling = 1.0f;
+        /** whether to filter the history buffer */
         public boolean filterHistory = true;
-        /**
-         * whether to apply the reconstruction filter to the input
-         */
+        /** whether to apply the reconstruction filter to the input */
         public boolean filterInput = true;
-        /**
-         * whether to use the YcoCg color-space for history rejection
-         */
+        /** whether to use the YcoCg color-space for history rejection */
         public boolean useYCoCg = false;
-        /**
-         * type of color gamut box
-         */
+        /** set to true for HDR content */
+        public boolean hdr = true;
+        /** type of color gamut box */
         @NonNull
         public TemporalAntiAliasingOptions.BoxType boxType = TemporalAntiAliasingOptions.BoxType.AABB;
-        /**
-         * clipping algorithm
-         */
+        /** clipping algorithm */
         @NonNull
         public TemporalAntiAliasingOptions.BoxClipping boxClipping = TemporalAntiAliasingOptions.BoxClipping.ACCURATE;
+        /** Jitter Pattern */
         @NonNull
         public TemporalAntiAliasingOptions.JitterPattern jitterPattern = TemporalAntiAliasingOptions.JitterPattern.HALTON_23_X16;
+        /** High values increases ghosting artefact, lower values increases jittering, range [0.75, 1.25] */
         public float varianceGamma = 1.0f;
-        /**
-         * adjust the feedback dynamically to reduce flickering
-         */
+        /** adjust the feedback dynamically to reduce flickering */
         public boolean preventFlickering = false;
-        /**
-         * whether to apply history reprojection (debug option)
-         */
+        /** whether to apply history reprojection (debug option) */
         public boolean historyReprojection = true;
     }
 
@@ -2138,30 +2029,22 @@ public class View {
      * @see #setScreenSpaceReflectionsOptions
      */
     public static class ScreenSpaceReflectionsOptions {
-        /**
-         * ray thickness, in world units
-         */
+        /** ray thickness, in world units */
         public float thickness = 0.1f;
-        /**
-         * bias, in world units, to prevent self-intersections
-         */
+        /** bias, in world units, to prevent self-intersections */
         public float bias = 0.01f;
-        /**
-         * maximum distance, in world units, to raycast
-         */
+        /** maximum distance, in world units, to raycast */
         public float maxDistance = 3.0f;
-        /**
-         * stride, in texels, for samples along the ray.
-         */
+        /** stride, in texels, for samples along the ray. */
         public float stride = 2.0f;
         public boolean enabled = false;
     }
 
     /**
      * Options for the  screen-space guard band.
-     * A guard band can be enabled to avoid some artifacts towards the edge of the screen when
+     * <p>A guard band can be enabled to avoid some artifacts towards the edge of the screen when
      * using screen-space effects such as SSAO. Enabling the guard band reduces performance slightly.
-     * Currently the guard band can only be enabled or disabled.
+     * Currently the guard band can only be enabled or disabled.</p>
      */
     public static class GuardBandOptions {
         public boolean enabled = false;
@@ -2174,13 +2057,9 @@ public class View {
      * @see #setSampleCount
      */
     public enum AntiAliasing {
-        /**
-         * no anti aliasing performed as part of post-processing
-         */
+        /** no anti aliasing performed as part of post-processing */
         NONE,
-        /**
-         * FXAA is a low-quality but very efficient type of anti-aliasing. (default).
-         */
+        /** FXAA is a low-quality but very efficient type of anti-aliasing. (default). */
         FXAA,
     }
 
@@ -2188,13 +2067,9 @@ public class View {
      * List of available post-processing dithering techniques.
      */
     public enum Dithering {
-        /**
-         * No dithering
-         */
+        /** No dithering */
         NONE,
-        /**
-         * Temporal dithering (default)
-         */
+        /** Temporal dithering (default) */
         TEMPORAL,
     }
 
@@ -2203,21 +2078,13 @@ public class View {
      * @see #setShadowType
      */
     public enum ShadowType {
-        /**
-         * percentage-closer filtered shadows (default)
-         */
+        /** percentage-closer filtered shadows (default) */
         PCF,
-        /**
-         * variance shadows
-         */
+        /** variance shadows */
         VSM,
-        /**
-         * PCF with contact hardening simulation
-         */
+        /** PCF with contact hardening simulation */
         DPCF,
-        /**
-         * PCF with soft shadows and contact hardening
-         */
+        /** PCF with soft shadows and contact hardening */
         PCSS,
         PCFd,
     }
@@ -2225,14 +2092,14 @@ public class View {
     /**
      * View-level options for VSM Shadowing.
      * @see #setVsmShadowOptions
-     * @warning This API is still experimental and subject to change.
+     * <b>Warning:</b> This API is still experimental and subject to change.
      */
     public static class VsmShadowOptions {
         /**
          * Sets the number of anisotropic samples to use when sampling a VSM shadow map. If greater
          * than 0, mipmaps will automatically be generated each frame for all lights.
          *
-         * The number of anisotropic samples = 2 ^ vsmAnisotropy.
+         * <p>The number of anisotropic samples = 2 ^ vsmAnisotropy.</p>
          */
         public int anisotropy = 0;
         /**
@@ -2266,7 +2133,7 @@ public class View {
     /**
      * View-level options for DPCF and PCSS Shadowing.
      * @see #setSoftShadowOptions
-     * @warning This API is still experimental and subject to change.
+     * <b>Warning:</b> This API is still experimental and subject to change.
      */
     public static class SoftShadowOptions {
         /**

android/filament-tools/.gitignore

@@ -0,0 +1,12 @@
+*.iml
+.gradle
+/local.properties
+/.idea/workspace.xml
+/.idea/libraries
+/.idea/caches
+/.idea/gradle.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+/.cxx

android/filament-tools/build.gradle

@@ -0,0 +1,64 @@
+plugins {
+    id "de.undercouch.download" version "5.6.0"
+}
+
+apply from: rootProject.file('gradle/gradle-mvn-push.gradle')
+
+def tools = ['matc', 'cmgen']
+
+def platforms = [
+    'mac':     [classifier: 'osx-aarch_64',    archive: "filament-v${VERSION_NAME}-mac.tgz",     path: { t -> "filament/bin/${t}" }],
+    'linux':   [classifier: 'linux-x86_64',   archive: "filament-v${VERSION_NAME}-linux.tgz",   path: { t -> "filament/bin/${t}" }],
+    'windows': [classifier: 'windows-x86_64', archive: "filament-v${VERSION_NAME}-windows.tgz", path: { t -> "bin/${t}.exe" }]
+]
+
+platforms.each { platform, config ->
+    def platformName = platform.capitalize()
+    def remoteUrl = "https://github.com/google/filament/releases/download/v${VERSION_NAME}/${config.archive}"
+    def downloadFile = file("${buildDir}/downloads/${config.archive}")
+    def extractDir = file("${buildDir}/extracted/filament-v${VERSION_NAME}-${platform}")
+
+    task "downloadRelease${platformName}"(type: Download) {
+        src remoteUrl
+        dest downloadFile
+        overwrite false
+    }
+
+    def extractionTask = task "extractTools${platformName}"(dependsOn: "downloadRelease${platformName}", type: Copy) {
+        group = "setup"
+        from tarTree(resources.gzip(downloadFile))
+
+        // Include specific tools based on platform pattern
+        include tools.collect { tool -> config.path(tool) }
+
+        // Flatten the path so it lands directly in 'into'
+        eachFile { fcd ->
+            fcd.relativePath = new RelativePath(true, fcd.name)
+        }
+
+        into extractDir
+        includeEmptyDirs = false
+    }
+}
+
+publishing {
+    publications {
+        tools.each { toolName ->
+            create(toolName, MavenPublication) {
+                artifactId = toolName
+
+                platforms.each { platform, config ->
+                    def extractDir = file("${buildDir}/extracted/filament-v${VERSION_NAME}-${platform}")
+                    def archivePath = config.path(toolName)
+                    def exeName = new File(archivePath).name
+
+                    artifact(new File(extractDir, exeName)) {
+                        classifier = config.classifier
+                        extension = "exe"
+                        builtBy tasks.named("extractTools${platform.capitalize()}")
+                    }
+                }
+            }
+        }
+    }
+}

android/filament-tools/gradle.properties

@@ -0,0 +1,2 @@
+POM_NAME=Filament
+POM_PACKAGING=exe

android/filament-utils-android/CMakeLists.txt

@@ -22,6 +22,10 @@ add_library(image STATIC IMPORTED)
 set_target_properties(image PROPERTIES IMPORTED_LOCATION
         ${FILAMENT_DIR}/lib/${ANDROID_ABI}/libimage.a)
 
+add_library(imageio-lite STATIC IMPORTED)
+set_target_properties(imageio-lite PROPERTIES IMPORTED_LOCATION
+        ${FILAMENT_DIR}/lib/${ANDROID_ABI}/libimageio-lite.a)
+
 add_library(ktxreader STATIC IMPORTED)
 set_target_properties(ktxreader PROPERTIES IMPORTED_LOCATION
         ${FILAMENT_DIR}/lib/${ANDROID_ABI}/libktxreader.a)
@@ -30,6 +34,10 @@ add_library(viewer STATIC IMPORTED)
 set_target_properties(viewer PROPERTIES IMPORTED_LOCATION
         ${FILAMENT_DIR}/lib/${ANDROID_ABI}/libviewer.a)
 
+add_library(imagediff STATIC IMPORTED)
+set_target_properties(imagediff PROPERTIES IMPORTED_LOCATION
+        ${FILAMENT_DIR}/lib/${ANDROID_ABI}/libimagediff.a)
+
 add_library(civetweb STATIC IMPORTED)
 set_target_properties(civetweb PROPERTIES IMPORTED_LOCATION
         ${FILAMENT_DIR}/lib/${ANDROID_ABI}/libcivetweb.a)
@@ -57,6 +65,7 @@ add_library(filament-utils-jni SHARED
         src/main/cpp/IBLPrefilterContext.cpp
         src/main/cpp/Utils.cpp
         src/main/cpp/Manipulator.cpp
+        src/main/cpp/ImageDiff.cpp
         src/main/cpp/RemoteServer.cpp
 
         ${IMAGEIO_DIR}/include/imageio/ImageDecoder.h
@@ -74,6 +83,7 @@ target_include_directories(filament-utils-jni PRIVATE
         ${FILAMENT_DIR}/include
         ../../filament/backend/include
         ${IMAGEIO_DIR}/include
+        ../../libs/imagediff/include
         ../../libs/utils/include)
 
 set_target_properties(filament-utils-jni PROPERTIES LINK_DEPENDS ${VERSION_SCRIPT})
@@ -85,10 +95,13 @@ target_link_libraries(filament-utils-jni
         PRIVATE camutils
         PRIVATE iblprefilter
         PRIVATE image
+        PRIVATE imageio-lite
         PRIVATE filament-jni
         PRIVATE ktxreader
         PRIVATE viewer
+        PRIVATE imagediff
         PRIVATE log
         PRIVATE utils
         PRIVATE perfetto        # needed only when FILAMENT_ENABLE_PERFETTO is defined
+        PRIVATE jnigraphics     # needed for AndroidBitmap_* functions in ImageDiff
 )

android/filament-utils-android/src/main/cpp/AutomationEngine.cpp

@@ -159,37 +159,50 @@ extern "C" JNIEXPORT void JNICALL
 Java_com_google_android_filament_utils_AutomationEngine_nGetViewerOptions(JNIEnv* env, jclass,
         jlong nativeObject, jobject result) {
     AutomationEngine* automation = (AutomationEngine*) nativeObject;
-    auto options = automation->getViewerOptions();
+    const auto& settings = automation->getSettings();
+    const auto& options = settings.viewer;
 
     const jclass klass = env->GetObjectClass(result);
 
-    const jfieldID cameraAperture = env->GetFieldID(klass, "cameraAperture", "F");
-    const jfieldID cameraSpeed = env->GetFieldID(klass, "cameraSpeed", "F");
-    const jfieldID cameraISO = env->GetFieldID(klass, "cameraISO", "F");
-    const jfieldID cameraNear = env->GetFieldID(klass, "cameraNear", "F");
-    const jfieldID cameraFar = env->GetFieldID(klass, "cameraFar", "F");
     const jfieldID groundShadowStrength = env->GetFieldID(klass, "groundShadowStrength", "F");
     const jfieldID groundPlaneEnabled = env->GetFieldID(klass, "groundPlaneEnabled", "Z");
     const jfieldID skyboxEnabled = env->GetFieldID(klass, "skyboxEnabled", "Z");
-    const jfieldID cameraFocalLength = env->GetFieldID(klass, "cameraFocalLength", "F");
-    const jfieldID cameraFocusDistance = env->GetFieldID(klass, "cameraFocusDistance", "F");
     const jfieldID autoScaleEnabled = env->GetFieldID(klass, "autoScaleEnabled", "Z");
     const jfieldID autoInstancingEnabled = env->GetFieldID(klass, "autoInstancingEnabled", "Z");
 
-    env->SetFloatField(result, cameraAperture, options.cameraAperture);
-    env->SetFloatField(result, cameraSpeed, options.cameraSpeed);
-    env->SetFloatField(result, cameraISO, options.cameraISO);
-    env->SetFloatField(result, cameraNear, options.cameraNear);
-    env->SetFloatField(result, cameraFar, options.cameraFar);
     env->SetFloatField(result, groundShadowStrength, options.groundShadowStrength);
     env->SetBooleanField(result, groundPlaneEnabled, options.groundPlaneEnabled);
     env->SetBooleanField(result, skyboxEnabled, options.skyboxEnabled);
-    env->SetFloatField(result, cameraFocalLength, options.cameraFocalLength);
-    env->SetFloatField(result, cameraFocusDistance, options.cameraFocusDistance);
     env->SetBooleanField(result, autoScaleEnabled, options.autoScaleEnabled);
     env->SetBooleanField(result, autoInstancingEnabled, options.autoInstancingEnabled);
 }
 
+extern "C" JNIEXPORT void JNICALL
+Java_com_google_android_filament_utils_AutomationEngine_nGetCameraSettings(JNIEnv* env, jclass,
+        jlong nativeObject, jobject result) {
+    AutomationEngine* automation = (AutomationEngine*) nativeObject;
+    const auto& settings = automation->getSettings();
+    const auto& camera = settings.camera;
+
+    const jclass klass = env->GetObjectClass(result);
+
+    const jfieldID aperture = env->GetFieldID(klass, "aperture", "F");
+    const jfieldID shutterSpeed = env->GetFieldID(klass, "shutterSpeed", "F");
+    const jfieldID sensitivity = env->GetFieldID(klass, "sensitivity", "F");
+    const jfieldID near = env->GetFieldID(klass, "near", "F");
+    const jfieldID far = env->GetFieldID(klass, "far", "F");
+    const jfieldID focalLength = env->GetFieldID(klass, "focalLength", "F");
+    const jfieldID focusDistance = env->GetFieldID(klass, "focusDistance", "F");
+
+    env->SetFloatField(result, aperture, camera.aperture);
+    env->SetFloatField(result, shutterSpeed, camera.shutterSpeed);
+    env->SetFloatField(result, sensitivity, camera.sensitivity);
+    env->SetFloatField(result, near, camera.near);
+    env->SetFloatField(result, far, camera.far);
+    env->SetFloatField(result, focalLength, camera.focalLength);
+    env->SetFloatField(result, focusDistance, camera.focusDistance);
+}
+
 extern "C" JNIEXPORT jlong JNICALL
 Java_com_google_android_filament_utils_AutomationEngine_nGetColorGrading(JNIEnv*, jclass,
         jlong nativeObject, jlong nativeEngine) {
@@ -215,6 +228,18 @@ Java_com_google_android_filament_utils_AutomationEngine_nShouldClose(JNIEnv*, jc
     return automation->shouldClose();
 }
 
+extern "C" JNIEXPORT jint JNICALL
+Java_com_google_android_filament_utils_AutomationEngine_nGetTestCount(JNIEnv*, jclass, jlong native) {
+    AutomationEngine* automation = (AutomationEngine*) native;
+    return (jint) automation->testCount();
+}
+
+extern "C" JNIEXPORT jint JNICALL
+Java_com_google_android_filament_utils_AutomationEngine_nGetCurrentTest(JNIEnv*, jclass, jlong native) {
+    AutomationEngine* automation = (AutomationEngine*) native;
+    return (jint) automation->currentTest();
+}
+
 extern "C" JNIEXPORT void JNICALL
 Java_com_google_android_filament_utils_AutomationEngine_nDestroy(JNIEnv*, jclass, jlong native) {
     AutomationEngine* automation = (AutomationEngine*) native;

android/filament-utils-android/src/main/cpp/ImageDiff.cpp

@@ -0,0 +1,217 @@
+/*
+ * Copyright (C) 2026 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <jni.h>
+#include <android/bitmap.h>
+
+#include <imagediff/ImageDiff.h>
+#include <utils/Log.h>
+
+#include <vector>
+
+using namespace imagediff;
+using namespace utils;
+
+namespace {
+
+struct BitmapLock {
+    JNIEnv* env;
+    jobject bitmap;
+    void* pixels;
+    AndroidBitmapInfo info;
+
+    BitmapLock(JNIEnv* env, jobject bitmap) : env(env), bitmap(bitmap), pixels(nullptr) {
+        if (!bitmap) return;
+        if (AndroidBitmap_getInfo(env, bitmap, &info) < 0) {
+            return;
+        }
+        if (AndroidBitmap_lockPixels(env, bitmap, &pixels) < 0) {
+            pixels = nullptr;
+        }
+    }
+
+    ~BitmapLock() {
+        if (pixels) {
+            AndroidBitmap_unlockPixels(env, bitmap);
+        }
+    }
+
+    bool isValid() const { return pixels != nullptr; }
+
+    imagediff::Bitmap toBitmap() const {
+        return {
+            .width = (uint32_t) info.width,
+            .height = (uint32_t) info.height,
+            .stride = (size_t) info.stride,
+            .data = pixels
+        };
+    }
+};
+
+} // namespace
+
+
+
+// Helper to convert C++ ImageDiffResult to Java Result
+jobject createResult(JNIEnv* env, ImageDiffResult const& result, bool generateDiff) {
+    // Create Result class/objects
+    jclass resultClass = env->FindClass("com/google/android/filament/utils/ImageDiff$Result");
+    jmethodID resultCtor = env->GetMethodID(resultClass, "<init>", "()V");
+    jobject resultObj = env->NewObject(resultClass, resultCtor);
+    jfieldID statusField = env->GetFieldID(resultClass, "status", "Lcom/google/android/filament/utils/ImageDiff$Result$Status;");
+    jfieldID failingCountField = env->GetFieldID(resultClass, "failingPixelCount", "J");
+    jfieldID maxDiffField = env->GetFieldID(resultClass, "maxDiffFound", "[F");
+    jfieldID diffImageField = env->GetFieldID(resultClass, "diffImage", "Landroid/graphics/Bitmap;");
+
+    // Map Status enum
+    jclass statusEnum = env->FindClass("com/google/android/filament/utils/ImageDiff$Result$Status");
+    jobject statusObj = nullptr;
+    jfieldID enumField = nullptr;
+    switch (result.status) {
+        case ImageDiffResult::Status::PASSED:
+            enumField = env->GetStaticFieldID(statusEnum, "PASSED", "Lcom/google/android/filament/utils/ImageDiff$Result$Status;");
+            break;
+        case ImageDiffResult::Status::SIZE_MISMATCH:
+             enumField = env->GetStaticFieldID(statusEnum, "SIZE_MISMATCH", "Lcom/google/android/filament/utils/ImageDiff$Result$Status;");
+            break;
+        case ImageDiffResult::Status::PIXEL_DIFFERENCE:
+             enumField = env->GetStaticFieldID(statusEnum, "PIXEL_DIFFERENCE", "Lcom/google/android/filament/utils/ImageDiff$Result$Status;");
+            break;
+    }
+    statusObj = env->GetStaticObjectField(statusEnum, enumField);
+    env->SetObjectField(resultObj, statusField, statusObj);
+
+    env->SetLongField(resultObj, failingCountField, (jlong) result.failingPixelCount);
+
+    jfloatArray maxDiffArray = env->NewFloatArray(4);
+    env->SetFloatArrayRegion(maxDiffArray, 0, 4, result.maxDiffFound);
+    env->SetObjectField(resultObj, maxDiffField, maxDiffArray);
+
+    if (generateDiff && result.diffImage.getWidth() > 0) {
+        jclass bitmapClass = env->FindClass("android/graphics/Bitmap");
+        jmethodID createBitmap = env->GetStaticMethodID(bitmapClass, "createBitmap", 
+            "(IILandroid/graphics/Bitmap$Config;)Landroid/graphics/Bitmap;");
+        
+        jclass configClass = env->FindClass("android/graphics/Bitmap$Config");
+        jfieldID argb8888 = env->GetStaticFieldID(configClass, "ARGB_8888", "Landroid/graphics/Bitmap$Config;");
+        jobject configObj = env->GetStaticObjectField(configClass, argb8888);
+
+        uint32_t width = result.diffImage.getWidth();
+        uint32_t height = result.diffImage.getHeight();
+        jobject diffBitmap = env->CallStaticObjectMethod(bitmapClass, createBitmap, (jint)width, (jint)height, configObj);
+        
+        if (diffBitmap) {
+            void* diffPixels;
+            if (AndroidBitmap_lockPixels(env, diffBitmap, &diffPixels) == 0) {
+                float const* src = result.diffImage.getPixelRef();
+                uint8_t* dst = (uint8_t*) diffPixels;
+                uint32_t channels = result.diffImage.getChannels(); // usually 4
+                
+                for (size_t i = 0; i < width * height; ++i) {
+                    for (int c = 0; c < 4; ++c) {
+                        float v = 0.0f;
+                        if (c < channels) v = src[i * channels + c];
+                        if (c == 3 && channels < 4) v = 1.0f; // Alpha 1.0 if missing
+                        dst[i * 4 + c] = (uint8_t) std::min(255.0f, std::max(0.0f, v * 255.0f));
+                    }
+                }
+                AndroidBitmap_unlockPixels(env, diffBitmap);
+                env->SetObjectField(resultObj, diffImageField, diffBitmap);
+            }
+        }
+    }
+    
+    return resultObj;
+}
+
+extern "C" JNIEXPORT jobject JNICALL
+Java_com_google_android_filament_utils_ImageDiff_nCompareBasic(JNIEnv* env, jclass,
+        jobject refBitmap, jobject candBitmap, jint mode, jint swizzle, jint channelMask,
+        jfloat maxAbsDiff, jfloat maxFailingPixelsFraction, jobject maskBitmap) {
+
+    BitmapLock refArg(env, refBitmap);
+    BitmapLock candArg(env, candBitmap);
+    BitmapLock maskArg(env, maskBitmap);
+
+    if (!refArg.isValid() || !candArg.isValid()) {
+         ImageDiffResult emptyResult; 
+         emptyResult.status = ImageDiffResult::Status::SIZE_MISMATCH; // or ERROR
+         return createResult(env, emptyResult, false);
+    }
+
+    ImageDiffConfig config;
+    config.mode = (ImageDiffConfig::Mode) mode;
+    config.swizzle = (ImageDiffConfig::Swizzle) swizzle;
+    config.channelMask = (uint8_t) channelMask;
+    config.maxAbsDiff = maxAbsDiff;
+    config.maxFailingPixelsFraction = maxFailingPixelsFraction;
+
+    imagediff::Bitmap const* maskPtr = nullptr;
+    imagediff::Bitmap maskVal;
+    if (maskBitmap && maskArg.isValid()) {
+         maskVal = maskArg.toBitmap();
+         maskPtr = &maskVal;
+    }
+
+    bool generateDiff = true;
+    ImageDiffResult result = compare(refArg.toBitmap(), candArg.toBitmap(), config, maskPtr, generateDiff);
+
+    return createResult(env, result, generateDiff);
+}
+
+extern "C" JNIEXPORT jobject JNICALL
+Java_com_google_android_filament_utils_ImageDiff_nCompareJson(JNIEnv* env, jclass,
+        jobject refBitmap, jobject candBitmap, jstring jsonConfig, jobject maskBitmap) {
+        
+    BitmapLock refArg(env, refBitmap);
+    BitmapLock candArg(env, candBitmap);
+    BitmapLock maskArg(env, maskBitmap);
+
+    if (!refArg.isValid() || !candArg.isValid()) {
+         ImageDiffResult emptyResult; 
+         emptyResult.status = ImageDiffResult::Status::SIZE_MISMATCH; // or ERROR
+         return createResult(env, emptyResult, false);
+    }
+
+    ImageDiffConfig config;
+    const char* nativeJson = env->GetStringUTFChars(jsonConfig, 0);
+    size_t length = env->GetStringUTFLength(jsonConfig);
+    
+    bool parsed = parseConfig(nativeJson, length, &config);
+    env->ReleaseStringUTFChars(jsonConfig, nativeJson);
+
+    if (!parsed) {
+        // Fallback to default or error?
+        // We could log error.
+        utils::slog.e << "ImageDiff JNI: Failed to parse JSON config" << utils::io::endl;
+        ImageDiffResult errResult;
+        errResult.status = ImageDiffResult::Status::PIXEL_DIFFERENCE; // assume fail
+        return createResult(env, errResult, false);
+    }
+
+    imagediff::Bitmap const* maskPtr = nullptr;
+    imagediff::Bitmap maskVal;
+    if (maskBitmap && maskArg.isValid()) {
+         maskVal = maskArg.toBitmap();
+         maskPtr = &maskVal;
+    }
+
+    bool generateDiff = true;
+    ImageDiffResult result = compare(refArg.toBitmap(), candArg.toBitmap(), config, maskPtr, generateDiff);
+
+    return createResult(env, result, generateDiff);
+}
+

android/filament-utils-android/src/main/java/com/google/android/filament/utils/AutomationEngine.java

@@ -94,20 +94,23 @@ public class AutomationEngine {
      * Allows remote control for the viewer.
      */
     public static class ViewerOptions {
-        public float cameraAperture = 16.0f;
-        public float cameraSpeed = 125.0f;
-        public float cameraISO = 100.0f;
-        public float cameraNear = 0.1f;
-        public float cameraFar = 100.0f;
         public float groundShadowStrength = 0.75f;
         public boolean groundPlaneEnabled = false;
         public boolean skyboxEnabled = true;
-        public float cameraFocalLength = 28.0f;
-        public float cameraFocusDistance = 0.0f;
         public boolean autoScaleEnabled = true;
         public boolean autoInstancingEnabled = false;
     }
 
+    public static class CameraSettings {
+        public float aperture = 16.0f;
+        public float shutterSpeed = 125.0f;
+        public float sensitivity = 100.0f;
+        public float near = 0.1f;
+        public float far = 100.0f;
+        public float focalLength = 28.0f;
+        public float focusDistance = 10.0f;
+    }
+
     /**
      * Creates an automation engine from a JSON specification.
      *
@@ -229,6 +232,13 @@ public class AutomationEngine {
         return result;
     }
 
+    @NonNull
+    public CameraSettings getCameraSettings() {
+        CameraSettings result = new CameraSettings();
+        nGetCameraSettings(mNativeObject, result);
+        return result;
+    }
+
     /**
      * Gets a color grading object that corresponds to the latest settings.
      *
@@ -261,6 +271,9 @@ public class AutomationEngine {
      */
     public boolean shouldClose() { return nShouldClose(mNativeObject); }
 
+    public int getTestCount() { return nGetTestCount(mNativeObject); }
+    public int getCurrentTest() { return nGetCurrentTest(mNativeObject); }
+
     @Override
     protected void finalize() throws Throwable {
         nDestroy(mNativeObject);
@@ -280,9 +293,12 @@ public class AutomationEngine {
             long[] materials, long ibl, int sunlight, int[] assetLights, long lightManager,
             long scene, long renderer);
     private static native void nGetViewerOptions(long nativeObject, Object result);
+    private static native void nGetCameraSettings(long nativeObject, Object result);
     private static native long nGetColorGrading(long nativeObject, long nativeEngine);
     private static native void nSignalBatchMode(long nativeObject);
     private static native void nStopRunning(long nativeObject);
     private static native boolean nShouldClose(long nativeObject);
+    private static native int nGetTestCount(long nativeObject);
+    private static native int nGetCurrentTest(long nativeObject);
     private static native void nDestroy(long nativeObject);
 }

android/filament-utils-android/src/main/java/com/google/android/filament/utils/ImageDiff.java

@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2026 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.android.filament.utils;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import android.graphics.Bitmap;
+
+public class ImageDiff {
+    public enum Mode {
+        LEAF, AND, OR
+    }
+
+    public enum Swizzle {
+        RGBA, BGRA
+    }
+
+    public static class Config {
+        @NonNull
+        public Mode mode = Mode.LEAF;
+        @NonNull
+        public Swizzle swizzle = Swizzle.RGBA;
+        public int channelMask = 0xF;
+        public float maxAbsDiff = 0.0f;
+        public float maxFailingPixelsFraction = 0.0f;
+        // Children not supported in this simple wrapper for now, can be added if needed
+    }
+
+    public static class Result {
+        public enum Status {
+            PASSED,
+            SIZE_MISMATCH,
+            PIXEL_DIFFERENCE
+        }
+
+        public Status status;
+        public long failingPixelCount;
+        public float[] maxDiffFound; // [R, G, B, A]
+        public Bitmap diffImage; // Null if not generated
+    }
+
+    /**
+     * Compares two bitmaps using a configuration object.
+     *
+     * @param reference Golden image
+     * @param candidate Actual image
+     * @param config    Comparison configuration
+     * @param mask      Optional mask (grayscale)
+     * @return Result of comparison
+     */
+    @NonNull
+    public static Result compareBasic(@NonNull Bitmap reference, @NonNull Bitmap candidate,
+            @NonNull Config config, @Nullable Bitmap mask) {
+        return nCompareBasic(reference, candidate, config.mode.ordinal(), config.swizzle.ordinal(),
+                config.channelMask, config.maxAbsDiff, config.maxFailingPixelsFraction, mask);
+    }
+
+    /**
+     * Compares two bitmaps using a JSON configuration string.
+     *
+     * @param reference Golden image
+     * @param candidate Actual image
+     * @param jsonConfig Comparison configuration in JSON format
+     * @param mask      Optional mask (grayscale)
+     * @return Result of comparison
+     */
+    @NonNull
+    public static Result compare(@NonNull Bitmap reference, @NonNull Bitmap candidate,
+            @NonNull String jsonConfig, @Nullable Bitmap mask) {
+        return nCompareJson(reference, candidate, jsonConfig, mask);
+    }
+
+    private static native Result nCompareBasic(Bitmap reference, Bitmap candidate, int mode, int swizzle,
+            int channelMask, float maxAbsDiff, float maxFailingPixelsFraction, Bitmap mask);
+
+    private static native Result nCompareJson(Bitmap reference, Bitmap candidate, String jsonConfig, Bitmap mask);
+}

android/filament-utils-android/src/main/java/com/google/android/filament/utils/ModelViewer.kt

@@ -16,6 +16,9 @@
 
 package com.google.android.filament.utils
 
+import android.graphics.Bitmap
+import android.os.Handler
+import android.os.Looper
 import android.view.MotionEvent
 import android.view.Surface
 import android.view.SurfaceView
@@ -26,6 +29,7 @@ import com.google.android.filament.android.UiHelper
 import com.google.android.filament.gltfio.*
 import kotlinx.coroutines.*
 import java.nio.Buffer
+import java.nio.ByteBuffer
 
 private const val kNearPlane = 0.05f     // 5 cm
 private const val kFarPlane = 1000.0f    // 1 km
@@ -119,6 +123,8 @@ class ModelViewer(
     private val target = DoubleArray(3)
     private val upward = DoubleArray(3)
 
+    private var debugFrameCallback: ((Bitmap) -> Unit)? = null
+
     init {
         renderer = engine.createRenderer()
         scene = engine.createScene()
@@ -305,10 +311,39 @@ class ModelViewer(
         // Render the scene, unless the renderer wants to skip the frame.
         if (renderer.beginFrame(swapChain!!, frameTimeNanos)) {
             renderer.render(view)
+
+            debugFrameCallback?.let {
+                val viewport = view.viewport
+                val bitmap = Bitmap.createBitmap(viewport.width, viewport.height,
+                        Bitmap.Config.ARGB_8888)
+                val buffer = ByteBuffer.allocateDirect(viewport.width * viewport.height * 4)
+
+                val handler = Handler(Looper.getMainLooper())
+                val pixelBufferDescriptor = Texture.PixelBufferDescriptor(buffer,
+                        Texture.Format.RGBA, Texture.Type.UBYTE, 1, 0, 0, 0, handler) {
+                    buffer.rewind()
+                    bitmap.copyPixelsFromBuffer(buffer)
+                    it(bitmap)
+                }
+                renderer.readPixels(viewport.left, viewport.bottom, viewport.width,
+                                    viewport.height, pixelBufferDescriptor)
+                debugFrameCallback = null
+            }
+
             renderer.endFrame()
         }
     }
 
+    /*
+     * Sets a callback that will be invoked with the next rendered frame as a Bitmap. Note that this
+     * is a one-time callback.
+     *
+     *  @param callback   callback to be invoked with a rendered frame as [Bitmap]
+     */
+    fun debugGetNextFrameCallback(callback: (Bitmap) -> Unit) {
+        debugFrameCallback = callback
+    }
+
     private fun populateScene(asset: FilamentAsset) {
         val rcm = engine.renderableManager
         var count = 0

android/gltfio-android/CMakeLists.txt

@@ -6,6 +6,7 @@ option(FILAMENT_ENABLE_FGVIEWER "Enables Frame Graph Viewer" OFF)
 option(FILAMENT_ENABLE_MATDBG "Enables Material debugger" OFF)
 option(FILAMENT_DISABLE_MATOPT "Disables material optimizations" OFF)
 option(FILAMENT_SUPPORTS_WEBGPU "Enables WebGPU on Android" OFF)
+option(FILAMENT_SUPPORTS_WEBP_TEXTURES "Enable webp texture support on Android" OFF)
 
 set(CMAKE_CXX_STANDARD 20)
 
@@ -30,6 +31,12 @@ add_library(stb STATIC IMPORTED)
 set_target_properties(stb PROPERTIES IMPORTED_LOCATION
         ${FILAMENT_DIR}/lib/${ANDROID_ABI}/libstb.a)
 
+if (FILAMENT_SUPPORTS_WEBP_TEXTURES)
+        add_library(webpdecoder STATIC IMPORTED)
+        set_target_properties(webpdecoder PROPERTIES IMPORTED_LOCATION
+                ${FILAMENT_DIR}/lib/${ANDROID_ABI}/libwebpdecoder.a)
+endif()
+
 add_library(basis_transcoder STATIC IMPORTED)
 set_target_properties(basis_transcoder PROPERTIES IMPORTED_LOCATION
         ${FILAMENT_DIR}/lib/${ANDROID_ABI}/libbasis_transcoder.a)
@@ -81,6 +88,10 @@ set(GLTFIO_INCLUDE_DIRS
         ../../libs/ktxreader/include
 )
 
+if (FILAMENT_SUPPORTS_WEBP_TEXTURES)
+        list(APPEND GLTFIO_INCLUDE_DIRS ../../third_party/libwebp/src)
+endif()
+
 add_library(gltfio-jni SHARED ${GLTFIO_SRCS})
 
 target_compile_definitions(gltfio-jni PUBLIC GLTFIO_DRACO_SUPPORTED=1)
@@ -107,3 +118,6 @@ target_link_libraries(gltfio-jni
         PRIVATE perfetto        # needed only when FILAMENT_ENABLE_PERFETTO is defined
         PRIVATE log             # needed only when perfetto above is used
 )
+if (FILAMENT_SUPPORTS_WEBP_TEXTURES)
+        target_link_libraries(gltfio-jni PRIVATE webpdecoder)
+endif()

android/gltfio-android/src/main/cpp/ResourceLoader.cpp

@@ -128,6 +128,18 @@ Java_com_google_android_filament_gltfio_ResourceLoader_nCreateKtx2Provider(JNIEn
     return (jlong) createKtx2Provider(engine);
 }
 
+extern "C" JNIEXPORT jboolean JNICALL
+Java_com_google_android_filament_gltfio_ResourceLoader_nIsWebpSupported(JNIEnv*, jclass) {
+    return (jboolean) isWebpSupported();
+}
+
+extern "C" JNIEXPORT jlong JNICALL
+Java_com_google_android_filament_gltfio_ResourceLoader_nCreateWebpProvider(JNIEnv*, jclass,
+        jlong nativeEngine) {
+    Engine* engine = (Engine*) nativeEngine;
+    return (jlong) createWebpProvider(engine);
+}
+
 extern "C" JNIEXPORT void JNICALL
 Java_com_google_android_filament_gltfio_ResourceLoader_nDestroyTextureProvider(JNIEnv*, jclass,
         jlong nativeProvider) {

android/gltfio-android/src/main/java/com/google/android/filament/gltfio/ResourceLoader.java

@@ -37,6 +37,7 @@ public class ResourceLoader {
     private final long mNativeObject;
     private final long mNativeStbProvider;
     private final long mNativeKtx2Provider;
+    private final long mNativeWebpProvider;
 
     /**
      * Constructs a resource loader tied to the given Filament engine.
@@ -50,9 +51,17 @@ public class ResourceLoader {
         mNativeObject = nCreateResourceLoader(nativeEngine, false);
         mNativeStbProvider = nCreateStbProvider(nativeEngine);
         mNativeKtx2Provider = nCreateKtx2Provider(nativeEngine);
+
         nAddTextureProvider(mNativeObject, "image/jpeg", mNativeStbProvider);
         nAddTextureProvider(mNativeObject, "image/png", mNativeStbProvider);
         nAddTextureProvider(mNativeObject, "image/ktx2", mNativeKtx2Provider);
+        if (nIsWebpSupported()) {
+            mNativeWebpProvider = nCreateWebpProvider(nativeEngine);            
+            nAddTextureProvider(mNativeObject, "image/webp", mNativeWebpProvider);
+        }
+        else {
+            mNativeWebpProvider = 0;
+        }
     }
 
     /**
@@ -68,9 +77,17 @@ public class ResourceLoader {
         mNativeObject = nCreateResourceLoader(nativeEngine, normalizeSkinningWeights);
         mNativeStbProvider = nCreateStbProvider(nativeEngine);
         mNativeKtx2Provider = nCreateKtx2Provider(nativeEngine);
+ 
         nAddTextureProvider(mNativeObject, "image/jpeg", mNativeStbProvider);
         nAddTextureProvider(mNativeObject, "image/png", mNativeStbProvider);
         nAddTextureProvider(mNativeObject, "image/ktx2", mNativeKtx2Provider);
+        if (nIsWebpSupported()) {
+            mNativeWebpProvider = nCreateWebpProvider(nativeEngine);            
+            nAddTextureProvider(mNativeObject, "image/webp", mNativeWebpProvider);
+        }
+        else {
+            mNativeWebpProvider = 0;
+        }
     }
 
     /**
@@ -80,6 +97,9 @@ public class ResourceLoader {
         nDestroyResourceLoader(mNativeObject);
         nDestroyTextureProvider(mNativeStbProvider);
         nDestroyTextureProvider(mNativeKtx2Provider);
+        if (nIsWebpSupported()) {       
+            nDestroyTextureProvider(mNativeWebpProvider);        
+        }
     }
 
     /**
@@ -191,6 +211,9 @@ public class ResourceLoader {
 
     private static native long nCreateStbProvider(long nativeEngine);
     private static native long nCreateKtx2Provider(long nativeEngine);
+    private static native boolean nIsWebpSupported();
+    private static native long nCreateWebpProvider(long nativeEngine);
+
     private static native void nAddTextureProvider(long nativeLoader, String url, long nativeProvider);
     private static native void nDestroyTextureProvider(long nativeProvider);
 }

android/gradle.properties

@@ -1,5 +1,5 @@
 GROUP=com.google.android.filament
-VERSION_NAME=1.67.0
+VERSION_NAME=1.69.2
 
 POM_DESCRIPTION=Real-time physically based rendering engine for Android.
 

android/samples/README.md

@@ -80,54 +80,12 @@ frame and the external texture are perfectly synchronized.
 
 ![Stream Test](../../docs/images/samples/sample_stream_test.jpg)
 
-## Prerequisites
+## Building Samples
 
 Before you start, make sure to read [Filament's README](../../README.md). You need to be able to
 compile Filament's native library and Filament's AAR for this project. The easiest way to proceed
 is to install all the required dependencies and to run the following commands at the root of the
-source tree:
+source tree.
 
-```shell
-./build.sh -p desktop -i release
-./build.sh -p android release
-```
+To build the samples, please follow the steps described in [BUILDING.md](../../BUILDING.md#android)
 
-This will build all the native components and the AAR required by this sample application.
-
-If you do not use the build script, you must set the `filament_tools_dir` property when invoking
-Gradle, either from the command line or from `local.properties`. This property must point to the
-distribution/install directory for desktop (produced by make/ninja install). This directory must
-contain `bin/matc` and `bin/cmgen`.
-
-Example:
-```shell
-./gradlew -Pfilament_tools_dir=../../dist-release assembleDebug
-```
-
-## Important: SDK location
-
-Either ensure your `ANDROID_HOME` environment variable is set or make sure the root project
-contains a `local.properties` file with the `sdk.dir` property pointing to your installation of
-the Android SDK.
-
-## Compiling
-
-### Android Studio
-
-You must use the latest stable release of Android Studio. To open the project, point Studio to the
-`android` folder. After opening the project and syncing to gradle, select the sample of your choice
-using the drop-down widget in the toolbar.
-
-To compile and run each sample make sure you have selected the appropriate build variant
-(arm7, arm8, x86 or x86_64). If you are not sure you can simply select the "universal"
-variant which includes all the other ones.
-
-### Command Line
-
-From the `android` directory in the project root:
-
-```shell
-./gradlew :samples:sample-hello-triangle:installDebug
-```
-
-Replace `sample-hello-triangle` with your preferred project.

android/samples/sample-gltf-viewer/src/main/java/com/google/android/filament/gltf/MainActivity.kt

@@ -389,9 +389,9 @@ class MainActivity : Activity() {
         viewerContent.assetLights = modelViewer.asset?.lightEntities
         automation.applySettings(modelViewer.engine, json, viewerContent)
         modelViewer.view.colorGrading = automation.getColorGrading(modelViewer.engine)
-        modelViewer.cameraFocalLength = automation.viewerOptions.cameraFocalLength
-        modelViewer.cameraNear = automation.viewerOptions.cameraNear
-        modelViewer.cameraFar = automation.viewerOptions.cameraFar
+        modelViewer.cameraFocalLength = automation.cameraSettings.focalLength
+        modelViewer.cameraNear = automation.cameraSettings.near
+        modelViewer.cameraFar = automation.cameraSettings.far
         updateRootTransform()
     }
 

android/samples/sample-render-validation/build.gradle

@@ -0,0 +1,35 @@
+plugins {
+    id 'com.android.application'
+    id 'kotlin-android'
+}
+
+project.ext.isSample = true
+
+kotlin {
+    jvmToolchain(versions.jdk)
+}
+
+android {
+    namespace 'com.google.android.filament.validation'
+
+    compileSdkVersion versions.compileSdk
+    defaultConfig {
+        applicationId "com.google.android.filament.validation"
+        minSdkVersion versions.minSdk
+        targetSdkVersion versions.targetSdk
+    }
+
+    compileOptions {
+        sourceCompatibility versions.jdk
+        targetCompatibility versions.jdk
+    }
+}
+
+dependencies {
+    implementation deps.kotlin
+    implementation deps.coroutines.core
+    implementation project(':filament-android')
+    implementation project(':gltfio-android')
+    implementation project(':filament-utils-android')
+    implementation project(':filament-utils-android')
+}

android/samples/sample-render-validation/src/main/AndroidManifest.xml

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" />
+
+    <application
+        android:allowBackup="true"
+        android:label="Filament Validation"
+        android:supportsRtl="true"
+        android:largeHeap="true"
+        android:requestLegacyExternalStorage="true"
+        android:theme="@android:style/Theme.NoTitleBar">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:configChanges="orientation|screenSize|screenLayout|keyboardHidden"
+            android:screenOrientation="fullSensor">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

android/samples/sample-render-validation/src/main/java/com/google/android/filament/validation/MainActivity.kt

@@ -0,0 +1,154 @@
+/*
+ * Copyright (C) 2026 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.android.filament.validation
+
+import android.app.Activity
+import android.os.Bundle
+import android.util.Log
+import android.view.Choreographer
+import android.view.SurfaceView
+import android.view.WindowManager
+import android.widget.TextView
+import android.widget.Toast
+import com.google.android.filament.utils.ModelViewer
+import com.google.android.filament.utils.Utils
+import java.io.File
+
+class MainActivity : Activity(), ValidationRunner.Callback {
+
+    companion object {
+        init {
+            Utils.init()
+            System.loadLibrary("filament-utils-jni")
+        }
+        private const val TAG = "FilamentValidation"
+    }
+
+    private lateinit var surfaceView: SurfaceView
+    private lateinit var choreographer: Choreographer
+    private lateinit var modelViewer: ModelViewer
+    private lateinit var statusTextView: TextView
+    private var validationRunner: ValidationRunner? = null
+    
+    // Frame callback
+    private val frameScheduler = object : Choreographer.FrameCallback {
+        override fun doFrame(frameTimeNanos: Long) {
+            choreographer.postFrameCallback(this)
+            modelViewer.render(frameTimeNanos)
+            validationRunner?.onFrame(frameTimeNanos)
+        }
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        
+        // Simple layout
+        val layout = android.widget.FrameLayout(this)
+        surfaceView = SurfaceView(this)
+        layout.addView(surfaceView)
+        
+        statusTextView = TextView(this)
+        statusTextView.setTextColor(0xFFFFFFFF.toInt())
+        statusTextView.textSize = 16f
+        statusTextView.setPadding(20, 20, 20, 20)
+        statusTextView.text = "Initializing..."
+        layout.addView(statusTextView)
+        
+        setContentView(layout)
+        window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
+
+        choreographer = Choreographer.getInstance()
+        modelViewer = ModelViewer(surfaceView)
+        
+        // Check permissions? 
+        // We assume 'adb install -g' or permissions granted.
+        // But for scoped storage we might not need PERMISSION if reading from app-specific dirs, 
+        // but user mentioned /sdcard/ so we need MANAGE_EXTERNAL_STORAGE or READ_EXTERNAL_STORAGE.
+        // For waiting/simplicity, we just try.
+        
+        handleIntent()
+    }
+    
+    private fun handleIntent() {
+        val intent = intent
+        val testConfigPath = intent.getStringExtra("test_config")
+        
+        if (testConfigPath != null) {
+            startValidation(testConfigPath)
+        } else {
+             statusTextView.text = "No test_config provided via Intent.\nUse -e test_config <path>"
+             Log.w(TAG, "No test config provided")
+        }
+    }
+
+    private fun startValidation(configPath: String) {
+        try {
+            Log.i(TAG, "Parsing config from $configPath")
+            val config = ConfigParser.parseFromPath(configPath)
+            
+            val outputDir = File(getExternalFilesDir(null), "validation_results")
+            Log.i(TAG, "Output dir: ${outputDir.absolutePath}")
+            
+            validationRunner = ValidationRunner(this, modelViewer, config, outputDir)
+            validationRunner?.callback = this
+            validationRunner?.start()
+            
+        } catch (e: Exception) {
+            Log.e(TAG, "Failed to start validation", e)
+            statusTextView.text = "Error: ${e.message}"
+        }
+    }
+
+    override fun onResume() {
+        super.onResume()
+        choreographer.postFrameCallback(frameScheduler)
+    }
+
+    override fun onPause() {
+        super.onPause()
+        choreographer.removeFrameCallback(frameScheduler)
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        choreographer.removeFrameCallback(frameScheduler)
+    }
+
+    override fun onTestFinished(result: ValidationRunner.TestResult) {
+        runOnUiThread {
+            val status = "Test ${result.name} finished: ${if(result.passed) "PASS" else "FAIL"}"
+            statusTextView.text = status
+            Log.i(TAG, status)
+        }
+    }
+
+    override fun onAllTestsFinished() {
+        runOnUiThread {
+            statusTextView.text = "All tests finished!"
+            Log.i(TAG, "All tests finished")
+            // Optional: Auto-close activity?
+            // finish()
+        }
+    }
+
+    override fun onStatusChanged(status: String) {
+        runOnUiThread {
+            statusTextView.text = status
+        }
+    }
+}
+

android/samples/sample-render-validation/src/main/java/com/google/android/filament/validation/TestConfig.kt

@@ -0,0 +1,166 @@
+/*
+ * Copyright (C) 2026 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.android.filament.validation
+
+import org.json.JSONArray
+import org.json.JSONObject
+import java.io.File
+import java.io.IOException
+
+data class RenderTestConfig(
+    val name: String,
+    val backends: List<String>,
+    val models: Map<String, String>, // name -> path
+    val tests: List<TestConfig>
+)
+
+data class TestConfig(
+    val name: String,
+    val description: String?,
+    val backends: List<String>,
+    val models: Set<String>,
+    val rendering: JSONObject,
+    val tolerance: JSONObject?
+)
+
+
+// See test/renderdiff/FORMAT.md for the full specification matched by this parser.
+class ConfigParser {
+    companion object {
+        fun parseFromPath(path: String): RenderTestConfig {
+            val file = File(path)
+            val jsonTxt = removeComments(file.readText())
+            val json = JSONObject(jsonTxt)
+            return parseRenderTestConfig(json, file.parentFile)
+        }
+
+        private fun removeComments(json: String): String {
+            return json.lines().joinToString("\n") { it.substringBefore("//") }
+        }
+
+        private fun parseRenderTestConfig(json: JSONObject, baseDir: File?): RenderTestConfig {
+            val name = json.getString("name")
+            val backends = json.getJSONArray("backends").toList<String>()
+            
+            val modelSearchPaths = json.optJSONArray("model_search_paths")?.toList<String>() ?: emptyList()
+            val models = mutableMapOf<String, String>()
+            
+            baseDir?.let { dir ->
+                modelSearchPaths.forEach { searchPath ->
+                    val searchDir = File(dir, searchPath)
+                    if (searchDir.exists()) {
+                        searchDir.walkTopDown().filter { it.isFile && (it.extension == "glb" || it.extension == "gltf") }.forEach { file ->
+                            models[file.nameWithoutExtension] = file.absolutePath
+                        }
+                    }
+                }
+            }
+
+            val presetsJson = json.optJSONArray("presets")
+            val presets = mutableMapOf<String, PresetConfig>()
+            if (presetsJson != null) {
+                for (i in 0 until presetsJson.length()) {
+                    val p = parsePreset(presetsJson.getJSONObject(i), models.keys)
+                    presets[p.name] = p
+                }
+            }
+
+            val testsJson = json.getJSONArray("tests")
+            val tests = mutableListOf<TestConfig>()
+            for (i in 0 until testsJson.length()) {
+                tests.add(parseTestConfig(testsJson.getJSONObject(i), models.keys, presets, backends))
+            }
+
+            return RenderTestConfig(name, backends, models, tests)
+        }
+
+        private fun parsePreset(json: JSONObject, existingModels: Set<String>): PresetConfig {
+            val name = json.getString("name")
+            val rendering = json.getJSONObject("rendering")
+            val models = json.optJSONArray("models")?.toList<String>() ?: emptyList()
+            
+            // Validate models
+            models.forEach { if (!existingModels.contains(it)) throw IllegalArgumentException("Model $it not found") }
+
+            val tolerance = json.optJSONObject("tolerance")
+            return PresetConfig(name, rendering, models, tolerance)
+        }
+
+        private fun parseTestConfig(
+            json: JSONObject, 
+            existingModels: Set<String>, 
+            presets: Map<String, PresetConfig>, 
+            defaultBackends: List<String>
+        ): TestConfig {
+            val name = json.getString("name")
+            val description = json.optString("description")
+            val backends = json.optJSONArray("backends")?.toList<String>() ?: defaultBackends
+            
+            val applyPresets = json.optJSONArray("apply_presets")?.toList<String>() ?: emptyList()
+            
+            val rendering = JSONObject()
+            val combinedModels = mutableSetOf<String>()
+            var lastTolerance: JSONObject? = null
+
+            applyPresets.forEach { presetName ->
+                val preset = presets[presetName] ?: throw IllegalArgumentException("Unknown preset $presetName")
+                // Merge rendering (flat copy)
+                val keys = preset.rendering.keys()
+                while(keys.hasNext()) {
+                    val k = keys.next()
+                    rendering.put(k, preset.rendering.get(k))
+                }
+                combinedModels.addAll(preset.models)
+                if (preset.tolerance != null) lastTolerance = preset.tolerance
+            }
+
+            val testRendering = json.optJSONObject("rendering")
+            if (testRendering != null) {
+                val keys = testRendering.keys()
+                while(keys.hasNext()) {
+                    val k = keys.next()
+                    rendering.put(k, testRendering.get(k))
+                }
+            }
+
+            val testModels = json.optJSONArray("models")?.toList<String>() ?: emptyList()
+            combinedModels.addAll(testModels)
+            
+             // Validate models
+            combinedModels.forEach { if (!existingModels.contains(it)) throw IllegalArgumentException("Model $it not found") }
+
+            val tolerance = json.optJSONObject("tolerance") ?: lastTolerance
+
+            return TestConfig(name, description, backends, combinedModels, rendering, tolerance)
+        }
+    }
+}
+
+data class PresetConfig(
+    val name: String,
+    val rendering: JSONObject,
+    val models: List<String>,
+    val tolerance: JSONObject?
+)
+
+private inline fun <reified T> JSONArray.toList(): List<T> {
+    val list = mutableListOf<T>()
+    for (i in 0 until length()) {
+        list.add(get(i) as T)
+    }
+    return list
+}

android/samples/sample-render-validation/src/main/java/com/google/android/filament/validation/ValidationRunner.kt

@@ -0,0 +1,327 @@
+/*
+ * Copyright (C) 2026 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.android.filament.validation
+
+import android.content.Context
+import android.graphics.Bitmap
+import android.util.Log
+import com.google.android.filament.Engine
+import com.google.android.filament.Renderer
+import com.google.android.filament.View
+import com.google.android.filament.utils.AutomationEngine
+import com.google.android.filament.utils.ImageDiff
+import com.google.android.filament.utils.ModelViewer
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import org.json.JSONObject
+import java.io.File
+import java.io.FileOutputStream
+import java.nio.ByteBuffer
+import java.nio.ByteOrder
+
+class ValidationRunner(
+    private val context: Context,
+    private val modelViewer: ModelViewer,
+    private val config: RenderTestConfig,
+    private val outputDir: File
+) {
+
+    private var currentState = State.IDLE
+    private var currentTestIndex = 0
+    private var currentModelIndex = 0
+    private var currentEngine: AutomationEngine? = null
+    private var currentTestConfig: TestConfig? = null
+    private var currentModelName: String? = null
+    
+    private var loadStartFence: com.google.android.filament.Fence? = null
+    private var loadStartTime = 0L
+
+    enum class State {
+        IDLE,
+        LOADING_MODEL,
+        WAITING_FOR_FENCE,
+        RUNNING_TEST,
+        COMPARING
+    }
+
+    interface Callback {
+        fun onTestFinished(result: TestResult)
+        fun onAllTestsFinished()
+        fun onStatusChanged(status: String)
+    }
+
+    var callback: Callback? = null
+
+    fun start() {
+        if (config.tests.isEmpty()) {
+            callback?.onAllTestsFinished()
+            return
+        }
+        currentTestIndex = 0
+        currentModelIndex = 0
+        startTest(config.tests[0])
+    }
+
+    private fun startTest(test: TestConfig) {
+        currentTestConfig = test
+        if (test.models.isEmpty()) {
+            nextTest()
+            return
+        }
+        currentModelIndex = 0
+        startModel(test.models.elementAt(0))
+    }
+
+    private fun startModel(modelName: String) {
+        currentModelName = modelName
+        val modelPath = config.models[modelName]
+        if (modelPath == null) {
+            Log.e("ValidationRunner", "Model $modelName not found")
+            nextModel()
+            return
+        }
+        
+        currentState = State.LOADING_MODEL
+        callback?.onStatusChanged("Loading $modelName for ${currentTestConfig?.name}")
+        
+        // Load model on main thread (required by ModelViewer)
+        // We assume this is called from main thread or we dispatch
+        loadModel(modelPath)
+    }
+
+    private fun loadModel(path: String) {
+        // Assume called on Main Thread
+        modelViewer.destroyModel()
+        try {
+            val bytes = File(path).readBytes()
+            val buffer = ByteBuffer.wrap(bytes)
+            modelViewer.loadModelGlb(buffer)
+            modelViewer.transformToUnitCube()
+            loadStartFence = modelViewer.engine.createFence()
+            loadStartTime = System.nanoTime()
+            currentState = State.WAITING_FOR_FENCE
+        } catch (e: Exception) {
+             Log.e("ValidationRunner", "Failed to load $path", e)
+             nextModel()
+        }
+    }
+
+    fun onFrame(frameTimeNanos: Long) {
+        when (currentState) {
+            State.IDLE -> {}
+            State.WAITING_FOR_FENCE -> {
+                loadStartFence?.let { fence ->
+                     if (fence.wait(com.google.android.filament.Fence.Mode.FLUSH, 0) == com.google.android.filament.Fence.FenceStatus.CONDITION_SATISFIED) {
+                         modelViewer.engine.destroyFence(fence)
+                         loadStartFence = null
+                         
+                         // Compile materials (simplified)
+                         modelViewer.scene.forEach { entity ->
+                             // ... existing material compilation logic ...
+                         }
+                         
+                         startAutomation()
+                     }
+                }
+            }
+            State.RUNNING_TEST -> {
+                currentEngine?.let { engine ->
+                    val content = AutomationEngine.ViewerContent()
+                    content.view = modelViewer.view
+                    content.renderer = modelViewer.renderer
+                    content.scene = modelViewer.scene
+                    content.lightManager = modelViewer.engine.lightManager
+                    
+                    // Tick
+                    // Delta time? 
+                    val deltaTime = 1.0f / 60.0f // Fixed step for consistency?
+                    engine.tick(modelViewer.engine, content, deltaTime)
+                    
+                    if (!engine.isRunning) {
+                        // Test finished (for this spec)
+                        currentState = State.COMPARING
+                        captureAndCompare()
+                    }
+                }
+            }
+            State.COMPARING -> {} // Busy
+            State.LOADING_MODEL -> {}
+        }
+    }
+
+    private fun startAutomation() {
+        val test = currentTestConfig!!
+        val specJson = JSONObject()
+        specJson.put("name", test.name)
+        specJson.put("base", test.rendering)
+        val fullSpec = "[${specJson.toString()}]"
+
+        currentEngine = AutomationEngine(fullSpec)
+        val options = AutomationEngine.Options()
+        options.sleepDuration = 0.0f // Minimal sleep, let frames drive it
+        options.minFrameCount = 5 // Ensure some frames pass
+        currentEngine?.setOptions(options)
+        currentEngine?.startRunning()
+        currentState = State.RUNNING_TEST
+    }
+
+
+    private fun captureAndCompare() {
+        callback?.onStatusChanged("Comparing ${currentTestConfig?.name}...")
+        val view = modelViewer.view
+        val renderer = modelViewer.renderer
+        val width = view.viewport.width
+        val height = view.viewport.height
+
+        val buffer = ByteBuffer.allocateDirect(width * height * 4)
+        
+        val pbd = com.google.android.filament.Texture.PixelBufferDescriptor(
+            buffer,
+            com.google.android.filament.Texture.Format.RGBA,
+            com.google.android.filament.Texture.Type.UBYTE,
+            1, 0, 0, 0, 0, // alignment, left, top, stride (0=default)
+            null // handler (null = current thread? no, handler is for callback)
+        ) {
+            // Callback when readPixels is done
+            // Dispatch to background thread for comparison to avoid blocking UI?
+            // "it" is undefined here? The callback interface is Runnable?
+            // Kotlin lambda for Runnable.
+            compareCapturedImage(buffer, width, height)
+        }
+        renderer.readPixels(0, 0, width, height, pbd)
+    }
+
+    private fun compareCapturedImage(buffer: java.nio.Buffer, width: Int, height: Int) {
+         // This runs on... which thread? Filament driver thread possibly.
+         // We should use a helper to process.
+         
+         val testName = currentTestConfig!!.name
+         val modelName = currentModelName!!
+         val backend = "opengl" // Hardcoded for now, or get from View/Engine?
+         val testFullName = "${testName}.${backend}.${modelName}"
+         
+         // Golden path
+         // We expect a golden directory.
+         val goldenFile = File(config.models.get(modelName)!!).parentFile.parentFile.resolve("golden/${testFullName}.png") 
+         // Strategy: models are in .../models/model.glb
+         // Goldens are in .../golden/
+         
+         Thread {
+             try {
+                // Convert buffer to Bitmap
+                val bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888)
+                bitmap.copyPixelsFromBuffer(buffer)
+                
+                // Flip Y? ReadPixels is typically bottom-up?
+                // Filament readPixels is bottom-left? YES.
+                // Bitmap is top-left.
+                // We need to flip.
+                val matrix = android.graphics.Matrix()
+                matrix.postScale(1f, -1f)
+                val flipped = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true)
+                
+                var passed = false
+                if (goldenFile.exists()) {
+                    val golden = android.graphics.BitmapFactory.decodeFile(goldenFile.absolutePath)
+                    if (golden != null) {
+                        // Populate tolerance from config
+                        val tol = currentTestConfig?.tolerance ?: org.json.JSONObject()
+                        val tolJson = tol.toString()
+                        
+                        val result = ImageDiff.compare(golden, flipped, tolJson, null)
+                        passed = (result.status == ImageDiff.Result.Status.PASSED)
+                        
+                        // Save diff if failed?
+                         if (!passed) {
+                            val diffFile = File(outputDir, "${testFullName}_diff.png")
+                            if (result.diffImage != null) {
+                                FileOutputStream(diffFile).use { out ->
+                                    result.diffImage.compress(Bitmap.CompressFormat.PNG, 100, out)
+                                }
+                            }
+                         }
+                    } else {
+                        Log.e("ValidationRunner", "Failed to load golden: ${goldenFile.absolutePath}")
+                    }
+                } else {
+                    Log.w("ValidationRunner", "Golden not found: ${goldenFile.absolutePath}")
+                }
+                
+                // Save output
+                val outFile = File(outputDir, "${testFullName}.png")
+                FileOutputStream(outFile).use { out ->
+                    flipped.compress(Bitmap.CompressFormat.PNG, 100, out)
+                }
+
+                callback?.onTestFinished(TestResult(testFullName, passed))
+                
+                // Schedule next model on main thread
+                // Use Handler or View.post
+                modelViewer.view.viewport
+                // dispatch nextModel()
+                android.os.Handler(android.os.Looper.getMainLooper()).post {
+                    nextModel()
+                }
+
+             } catch (e: Exception) {
+                 Log.e("ValidationRunner", "Comparison failed", e)
+                 android.os.Handler(android.os.Looper.getMainLooper()).post { nextModel() }
+             }
+         }.start()
+    }
+
+    private fun nextModel() {
+        currentModelIndex++
+        if (currentTestConfig != null && currentModelIndex < currentTestConfig!!.models.size) {
+            startModel(currentTestConfig!!.models.elementAt(currentModelIndex))
+        } else {
+            nextTest()
+        }
+    }
+
+
+    private fun nextTest() {
+        currentTestIndex++
+        if (currentTestIndex < config.tests.size) {
+            startTest(config.tests[currentTestIndex])
+        } else {
+            currentState = State.IDLE
+            zipResults()
+            callback?.onAllTestsFinished()
+        }
+    }
+
+    private fun zipResults() {
+        callback?.onStatusChanged("Zipping results...")
+        val zipFile = File(outputDir, "results.zip")
+        try {
+            java.util.zip.ZipOutputStream(java.io.FileOutputStream(zipFile)).use { zos ->
+                outputDir.walkTopDown().filter { it.isFile && it.name != "results.zip" }.forEach { file ->
+                    val entryName = file.relativeTo(outputDir).path
+                    zos.putNextEntry(java.util.zip.ZipEntry(entryName))
+                    file.inputStream().use { it.copyTo(zos) }
+                    zos.closeEntry()
+                }
+            }
+            Log.i("ValidationRunner", "Zipped results to ${zipFile.absolutePath}")
+        } catch (e: Exception) {
+            Log.e("ValidationRunner", "Failed to zip results", e)
+        }
+    }
+
+    data class TestResult(val name: String, val passed: Boolean)
+

android/samples/sample-texture-target/.gitignore

@@ -0,0 +1,12 @@
+*.iml
+.gradle
+/local.properties
+/.idea/workspace.xml
+/.idea/libraries
+/.idea/caches
+/.idea/gradle.xml
+.DS_Store
+/build
+/captures
+/src/main/assets
+.externalNativeBuild

android/samples/sample-texture-target/build.gradle

@@ -0,0 +1,53 @@
+plugins {
+    id 'com.android.application'
+    id 'kotlin-android'
+    id 'filament-tools-plugin'
+}
+
+project.ext.isSample = true
+
+kotlin {
+    jvmToolchain(versions.jdk)
+}
+
+filamentTools {
+    materialInputDir = project.layout.projectDirectory.dir("src/main/materials")
+    materialOutputDir = project.layout.projectDirectory.dir("src/main/assets/materials")
+}
+
+clean.doFirst {
+    delete "src/main/assets"
+}
+
+android {
+    namespace 'com.google.android.filament.texturetarget'
+
+    compileSdkVersion versions.compileSdk
+    defaultConfig {
+        applicationId "com.google.android.filament.texturetarget"
+        minSdkVersion 26
+        targetSdkVersion versions.targetSdk
+    }
+
+    // NOTE: This is a workaround required because the AGP task collectReleaseDependencies
+    //       is not configuration-cache friendly yet; this is only useful for Play publication
+    dependenciesInfo {
+        includeInApk = false
+    }
+
+    // We use the .filamat extension for materials compiled with matc
+    // Telling aapt to not compress them allows to load them efficiently
+    aaptOptions {
+        noCompress 'filamat', 'ktx'
+    }
+
+    compileOptions {
+        sourceCompatibility versions.jdk
+        targetCompatibility versions.jdk
+    }
+}
+
+dependencies {
+    implementation deps.kotlin
+    implementation project(':filament-android')
+}

android/samples/sample-texture-target/src/main/AndroidManifest.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+  <application
+      android:allowBackup="true"
+      android:icon="@mipmap/ic_launcher"
+      android:label="@string/app_name"
+      android:roundIcon="@mipmap/ic_launcher_round"
+      android:supportsRtl="true"
+      android:theme="@style/AppTheme">
+    <activity
+        android:exported="true"
+        android:name=".MainActivity">
+      <intent-filter>
+        <action android:name="android.intent.action.MAIN"/>
+
+        <category android:name="android.intent.category.LAUNCHER"/>
+      </intent-filter>
+    </activity>
+  </application>
+
+</manifest>

android/samples/sample-texture-target/src/main/java/com/google/android/filament/texturetarget/MainActivity.kt

@@ -0,0 +1,449 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.android.filament.texturetarget
+
+import android.animation.ValueAnimator
+import android.app.Activity
+import android.hardware.HardwareBuffer
+import android.opengl.Matrix
+import android.os.Bundle
+import android.view.Choreographer
+import android.view.Surface
+import android.view.SurfaceView
+import android.view.animation.LinearInterpolator
+import com.google.android.filament.*
+import com.google.android.filament.RenderableManager.PrimitiveType
+import com.google.android.filament.VertexBuffer.AttributeType
+import com.google.android.filament.VertexBuffer.VertexAttribute
+import com.google.android.filament.android.DisplayHelper
+import com.google.android.filament.android.FilamentHelper
+import com.google.android.filament.android.UiHelper
+import java.nio.ByteBuffer
+import java.nio.ByteOrder
+import java.nio.channels.Channels
+import kotlin.math.PI
+import kotlin.math.cos
+import kotlin.math.sin
+
+class MainActivity : Activity() {
+    companion object {
+        init {
+            Filament.init()
+        }
+    }
+
+    private lateinit var surfaceView: SurfaceView
+    private lateinit var uiHelper: UiHelper
+    private lateinit var displayHelper: DisplayHelper
+    private lateinit var choreographer: Choreographer
+
+    private lateinit var engine: Engine
+    private lateinit var renderer: Renderer
+    private lateinit var scene: Scene
+    private lateinit var view: View
+    private lateinit var camera: Camera
+
+    private lateinit var triangleMaterial: Material
+    private lateinit var texturedMaterial: Material
+    private lateinit var triangleVertexBuffer: VertexBuffer
+    private lateinit var triangleIndexBuffer: IndexBuffer
+    private lateinit var quadVertexBuffer: VertexBuffer
+    private lateinit var quadIndexBuffer: IndexBuffer
+
+    @Entity private var triangleRenderable = 0
+    @Entity private var quadRenderable = 0
+
+    private var swapChain: SwapChain? = null
+
+    private val frameScheduler = FrameCallback()
+    private val animator = ValueAnimator.ofFloat(0.0f, 360.0f)
+
+    private var hardwareBuffer: HardwareBuffer? = null
+    private var texture: Texture? = null
+    private var renderTarget: RenderTarget? = null
+
+    private var useExternalTexture = true
+
+    private lateinit var offscreenView: View
+    private lateinit var offscreenCamera: Camera
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        // To use set this flag with adb, run
+        // adb shell am start -n com.google.android.filament.texturetarget/.MainActivity --ez useExternalTexture false
+        useExternalTexture = intent.getBooleanExtra("useExternalTexture", true)
+        surfaceView = SurfaceView(this)
+        setContentView(surfaceView)
+        choreographer = Choreographer.getInstance()
+        displayHelper = DisplayHelper(this)
+        setupSurfaceView()
+        setupFilament()
+        setupView()
+        setupScene()
+    }
+
+    private fun setupSurfaceView() {
+        uiHelper = UiHelper(UiHelper.ContextErrorPolicy.DONT_CHECK)
+        uiHelper.renderCallback = SurfaceCallback()
+        uiHelper.attachTo(surfaceView)
+    }
+
+    private fun setupFilament() {
+        engine = Engine.create()
+        renderer = engine.createRenderer()
+        scene = engine.createScene()
+        view = engine.createView()
+        camera = engine.createCamera(engine.entityManager.create())
+        offscreenView = engine.createView()
+        offscreenCamera = engine.createCamera(engine.entityManager.create())
+    }
+
+    private fun setupView() {
+        scene.skybox = Skybox.Builder()
+            .priority(0)
+            .color(0.0f, 0.0f, 1.0f, 1.0f).build(engine)
+
+        // This is the view that will be drawn on screen.
+        view.camera = camera
+        view.scene = scene
+        view.isPostProcessingEnabled = false
+
+        // This is the view that will be rendered off-screen.
+        offscreenView.camera = offscreenCamera
+        offscreenView.scene = scene
+        offscreenView.isPostProcessingEnabled = false
+    }
+
+    private fun setupScene() {
+        loadMaterials()
+        createTriangleMesh()
+        createQuadMesh()
+
+        // layer 1: skybox
+        // layer 2: triangle
+        // layer 3: quad
+
+        triangleMaterial.defaultInstance.cullingMode = Material.CullingMode.NONE;
+        texturedMaterial.defaultInstance.cullingMode = Material.CullingMode.NONE;
+
+        // The triangle is a regular renderable.
+        triangleRenderable = EntityManager.get().create()
+        RenderableManager.Builder(1)
+            .geometry(0, PrimitiveType.TRIANGLES, triangleVertexBuffer, triangleIndexBuffer, 0, 3)
+            .material(0, triangleMaterial.defaultInstance)
+            .culling(false)
+            .castShadows(false)
+            .receiveShadows(false)
+            .layerMask(7, 2)
+            .build(engine, triangleRenderable)
+
+        // The quad is a regular renderable.
+        quadRenderable = EntityManager.get().create()
+        RenderableManager.Builder(1)
+            .geometry(0, PrimitiveType.TRIANGLES, quadVertexBuffer, quadIndexBuffer, 0, 6)
+            .material(0, texturedMaterial.defaultInstance)
+            .culling(false)
+            .castShadows(false)
+            .receiveShadows(false)
+            .layerMask(7, 4)
+            .build(engine, quadRenderable)
+
+        // We only want to render the triangle in the offscreen view.
+        offscreenView.setVisibleLayers(7, 3)    // render skybox + triangle
+
+        // We only want to render the quad in the on-screen view.
+        view.setVisibleLayers(7, 4)             // render quad only
+
+        scene.addEntity(triangleRenderable)
+        scene.addEntity(quadRenderable)
+
+        startAnimation()
+    }
+
+    private fun loadMaterials() {
+        readUncompressedAsset("materials/baked_color.filamat").let {
+            triangleMaterial = Material.Builder().payload(it, it.remaining()).build(engine)
+        }
+
+        if (useExternalTexture) {
+            readUncompressedAsset("materials/texturedExternal.filamat").let {
+                texturedMaterial = Material.Builder().payload(it, it.remaining()).build(engine)
+            }
+        } else {
+            readUncompressedAsset("materials/textured.filamat").let {
+                texturedMaterial = Material.Builder().payload(it, it.remaining()).build(engine)
+            }
+        }
+    }
+
+    private fun createTriangleMesh() {
+        val intSize = 4
+        val floatSize = 4
+        val shortSize = 2
+        val vertexSize = 3 * floatSize + intSize
+
+        data class Vertex(val x: Float, val y: Float, val z: Float, val color: Int)
+        fun ByteBuffer.put(v: Vertex): ByteBuffer {
+            putFloat(v.x)
+            putFloat(v.y)
+            putFloat(v.z)
+            putInt(v.color)
+            return this
+        }
+
+        val vertexCount = 3
+        val a1 = PI * 2.0 / 3.0
+        val a2 = PI * 4.0 / 3.0
+
+        val vertexData = ByteBuffer.allocate(vertexCount * vertexSize)
+            .order(ByteOrder.nativeOrder())
+            .put(Vertex(1.0f, 0.0f, 0.0f, 0xffff0000.toInt()))
+            .put(Vertex(cos(a1).toFloat(), sin(a1).toFloat(), 0.0f, 0xff00ff00.toInt()))
+            .put(Vertex(cos(a2).toFloat(), sin(a2).toFloat(), 0.0f, 0xff0000ff.toInt()))
+            .flip()
+
+        triangleVertexBuffer = VertexBuffer.Builder()
+            .bufferCount(1)
+            .vertexCount(vertexCount)
+            .attribute(VertexAttribute.POSITION, 0, AttributeType.FLOAT3, 0, vertexSize)
+            .attribute(VertexAttribute.COLOR, 0, AttributeType.UBYTE4, 3 * floatSize, vertexSize)
+            .normalized(VertexAttribute.COLOR)
+            .build(engine)
+        triangleVertexBuffer.setBufferAt(engine, 0, vertexData)
+
+        val indexData = ByteBuffer.allocate(vertexCount * shortSize)
+            .order(ByteOrder.nativeOrder())
+            .putShort(0)
+            .putShort(1)
+            .putShort(2)
+            .flip()
+
+        triangleIndexBuffer = IndexBuffer.Builder()
+            .indexCount(3)
+            .bufferType(IndexBuffer.Builder.IndexType.USHORT)
+            .build(engine)
+        triangleIndexBuffer.setBuffer(engine, indexData)
+    }
+
+    private fun createQuadMesh() {
+        val floatSize = 4
+        val shortSize = 2
+        val vertexSize = (2 * floatSize) + (2 * floatSize) // position + UV
+
+        data class Vertex(val x: Float, val y: Float, val u: Float, val v: Float)
+        fun ByteBuffer.put(v: Vertex): ByteBuffer {
+            putFloat(v.x)
+            putFloat(v.y)
+            putFloat(v.u)
+            putFloat(v.v)
+            return this
+        }
+
+        val vertexCount = 4
+        val vertexData = ByteBuffer.allocate(vertexCount * vertexSize)
+            .order(ByteOrder.nativeOrder())
+            .put(Vertex(-1.0f, -1.0f, 0.0f, 0.0f))
+            .put(Vertex( 1.0f, -1.0f, 1.0f, 0.0f))
+            .put(Vertex( 1.0f,  1.0f, 1.0f, 1.0f))
+            .put(Vertex(-1.0f,  1.0f, 0.0f, 1.0f))
+            .flip()
+
+        quadVertexBuffer = VertexBuffer.Builder()
+            .bufferCount(1)
+            .vertexCount(vertexCount)
+            .attribute(VertexAttribute.POSITION, 0, AttributeType.FLOAT2, 0, vertexSize)
+            .attribute(VertexAttribute.UV0, 0, AttributeType.FLOAT2, 2 * floatSize, vertexSize)
+            .build(engine)
+        quadVertexBuffer.setBufferAt(engine, 0, vertexData)
+
+        val indexData = ByteBuffer.allocate(6 * shortSize)
+            .order(ByteOrder.nativeOrder())
+            .putShort(0).putShort(1).putShort(2)
+            .putShort(0).putShort(2).putShort(3)
+            .flip()
+
+        quadIndexBuffer = IndexBuffer.Builder()
+            .indexCount(6)
+            .bufferType(IndexBuffer.Builder.IndexType.USHORT)
+            .build(engine)
+        quadIndexBuffer.setBuffer(engine, indexData)
+    }
+
+    private fun startAnimation() {
+        animator.interpolator = LinearInterpolator()
+        animator.duration = 4000
+        animator.repeatMode = ValueAnimator.RESTART
+        animator.repeatCount = ValueAnimator.INFINITE
+        animator.addUpdateListener { a ->
+            val transformMatrix = FloatArray(16)
+            Matrix.setRotateM(transformMatrix, 0, -(a.animatedValue as Float), 0.0f, 0.0f, 1.0f)
+            val tcm = engine.transformManager
+            tcm.setTransform(tcm.getInstance(triangleRenderable), transformMatrix)
+        }
+        animator.start()
+    }
+
+    override fun onResume() {
+        super.onResume()
+        choreographer.postFrameCallback(frameScheduler)
+        animator.start()
+    }
+
+    override fun onPause() {
+        super.onPause()
+        choreographer.removeFrameCallback(frameScheduler)
+        animator.cancel()
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        choreographer.removeFrameCallback(frameScheduler)
+        animator.cancel()
+        uiHelper.detach()
+
+        // Destroy all renderables.
+        scene.remove(triangleRenderable)
+        scene.remove(quadRenderable)
+
+        // Destroy all resources.
+        engine.destroyEntity(triangleRenderable)
+        engine.destroyEntity(quadRenderable)
+        engine.destroyRenderer(renderer)
+        engine.destroyVertexBuffer(triangleVertexBuffer)
+        engine.destroyIndexBuffer(triangleIndexBuffer)
+        engine.destroyVertexBuffer(quadVertexBuffer)
+        engine.destroyIndexBuffer(quadIndexBuffer)
+        engine.destroyMaterial(triangleMaterial)
+        engine.destroyMaterial(texturedMaterial)
+        engine.destroyView(view)
+        engine.destroyView(offscreenView)
+        engine.destroyScene(scene)
+        engine.destroyCameraComponent(camera.entity)
+        engine.destroyCameraComponent(offscreenCamera.entity)
+        renderTarget?.let { engine.destroyRenderTarget(it) }
+        texture?.let { engine.destroyTexture(it) }
+        hardwareBuffer?.close()
+
+        val entityManager = EntityManager.get()
+        entityManager.destroy(triangleRenderable)
+        entityManager.destroy(quadRenderable)
+        entityManager.destroy(camera.entity)
+        entityManager.destroy(offscreenCamera.entity)
+
+        engine.destroy()
+    }
+
+    inner class FrameCallback : Choreographer.FrameCallback {
+        override fun doFrame(frameTimeNanos: Long) {
+            choreographer.postFrameCallback(this)
+            if (uiHelper.isReadyToRender) {
+                if (renderer.beginFrame(swapChain!!, frameTimeNanos)) {
+                    // Render the triangle to the texture.
+                    renderer.render(offscreenView)
+                    // Render the quad to the screen.
+                    renderer.render(view)
+                    renderer.endFrame()
+                }
+            }
+        }
+    }
+
+    inner class SurfaceCallback : UiHelper.RendererCallback {
+        override fun onNativeWindowChanged(surface: Surface) {
+            swapChain?.let { engine.destroySwapChain(it) }
+            swapChain = engine.createSwapChain(surface, uiHelper.swapChainFlags)
+            displayHelper.attach(renderer, surfaceView.display)
+        }
+
+        override fun onDetachedFromSurface() {
+            displayHelper.detach()
+            swapChain?.let {
+                engine.destroySwapChain(it)
+                engine.flushAndWait()
+                swapChain = null
+            }
+        }
+
+        override fun onResized(width: Int, height: Int) {
+            // On-screen camera
+            val zoom = 1.0
+            val aspect = width.toDouble() / height.toDouble()
+            camera.setProjection(Camera.Projection.ORTHO, -aspect * zoom, aspect * zoom, -zoom, zoom, 0.0, 10.0)
+            view.viewport = Viewport(0, 0, width, height)
+
+            // Off-screen camera
+            val offscreenZoom = 1.5
+            offscreenCamera.setProjection(Camera.Projection.ORTHO,
+                -aspect * offscreenZoom, aspect * offscreenZoom,
+                -offscreenZoom, offscreenZoom, 0.0, 10.0)
+            offscreenView.viewport = Viewport(0, 0, width, height)
+
+            // If we have a render target, destroy it.
+            renderTarget?.let { engine.destroyRenderTarget(it) }
+            texture?.let { engine.destroyTexture(it) }
+            hardwareBuffer?.close()
+
+            if (useExternalTexture) {
+                // Create a new render target.
+                hardwareBuffer = HardwareBuffer.create(width, height,
+                    HardwareBuffer.RGBA_8888, 1,
+                    HardwareBuffer.USAGE_GPU_SAMPLED_IMAGE or HardwareBuffer.USAGE_GPU_COLOR_OUTPUT)
+
+                texture = Texture.Builder()
+                    .width(width)
+                    .height(height)
+                    .usage(Texture.Usage.COLOR_ATTACHMENT or Texture.Usage.SAMPLEABLE)
+                    .sampler(Texture.Sampler.SAMPLER_EXTERNAL)
+                    .format(Texture.InternalFormat.RGBA8)
+                    .external()
+                    .build(engine)
+
+                texture!!.setExternalImage(engine, hardwareBuffer!!)
+            } else {
+                texture = Texture.Builder()
+                    .width(width)
+                    .height(height)
+                    .levels(1)
+                    .usage(Texture.Usage.COLOR_ATTACHMENT or Texture.Usage.SAMPLEABLE)
+                    .format(Texture.InternalFormat.RGBA8)
+                    .build(engine)
+            }
+
+            renderTarget = RenderTarget.Builder()
+                .texture(RenderTarget.AttachmentPoint.COLOR, texture!!)
+                .build(engine)
+
+            offscreenView.renderTarget = renderTarget
+            // Set the texture on the quad material.
+            texturedMaterial.defaultInstance.setParameter("texture", texture!!,
+                TextureSampler(TextureSampler.MinFilter.LINEAR, TextureSampler.MagFilter.LINEAR,
+                               TextureSampler.WrapMode.CLAMP_TO_EDGE))
+            FilamentHelper.synchronizePendingFrames(engine)
+        }
+    }
+
+    private fun readUncompressedAsset(assetName: String): ByteBuffer {
+        assets.openFd(assetName).use { fd ->
+            val input = fd.createInputStream()
+            val dst = ByteBuffer.allocate(fd.length.toInt())
+            val src = Channels.newChannel(input)
+            src.read(dst)
+            src.close()
+            return dst.apply { rewind() }
+        }
+    }
+}

android/samples/sample-texture-target/src/main/materials/baked_color.mat

@@ -0,0 +1,18 @@
+material {
+    name : baked_color,
+    shadingModel : unlit,
+    requires : [
+        color
+    ]
+}
+
+fragment {
+    void material(inout MaterialInputs material) {
+        // You must always call the prepareMaterial() function
+        prepareMaterial(material);
+
+        // We set the material's color to the color interpolated from
+        // the model's vertices
+        material.baseColor = getColor();
+    }
+}

android/samples/sample-texture-target/src/main/materials/textured.mat

@@ -0,0 +1,20 @@
+material {
+    name : textured,
+    shadingModel : unlit,
+    parameters : [
+        {
+            type : sampler2d,
+            name : texture
+        }
+    ],
+    requires: [
+        uv0
+    ]
+}
+
+fragment {
+    void material(inout MaterialInputs material) {
+        prepareMaterial(material);
+        material.baseColor = texture(materialParams_texture, uvToRenderTargetUV(getUV0()));
+    }
+}

android/samples/sample-texture-target/src/main/materials/texturedExternal.mat

@@ -0,0 +1,20 @@
+material {
+    name : textured,
+    shadingModel : unlit,
+    parameters : [
+        {
+            type : samplerExternal,
+            name : texture
+        }
+    ],
+    requires: [
+        uv0
+    ]
+}
+
+fragment {
+    void material(inout MaterialInputs material) {
+        prepareMaterial(material);
+        material.baseColor = texture(materialParams_texture, uvToRenderTargetUV(getUV0()));
+    }
+}

android/samples/sample-texture-target/src/main/res/drawable-v24/ic_launcher_foreground.xml

@@ -0,0 +1,34 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportHeight="108"
+    android:viewportWidth="108">
+  <path
+      android:fillType="evenOdd"
+      android:pathData="M32,64C32,64 38.39,52.99 44.13,50.95C51.37,48.37 70.14,49.57 70.14,49.57L108.26,87.69L108,109.01L75.97,107.97L32,64Z"
+      android:strokeColor="#00000000"
+      android:strokeWidth="1">
+    <aapt:attr name="android:fillColor">
+      <gradient
+          android:endX="78.5885"
+          android:endY="90.9159"
+          android:startX="48.7653"
+          android:startY="61.0927"
+          android:type="linear">
+        <item
+            android:color="#44000000"
+            android:offset="0.0"/>
+        <item
+            android:color="#00000000"
+            android:offset="1.0"/>
+      </gradient>
+    </aapt:attr>
+  </path>
+  <path
+      android:fillColor="#FFFFFF"
+      android:fillType="nonZero"
+      android:pathData="M66.94,46.02L66.94,46.02C72.44,50.07 76,56.61 76,64L32,64C32,56.61 35.56,50.11 40.98,46.06L36.18,41.19C35.45,40.45 35.45,39.3 36.18,38.56C36.91,37.81 38.05,37.81 38.78,38.56L44.25,44.05C47.18,42.57 50.48,41.71 54,41.71C57.48,41.71 60.78,42.57 63.68,44.05L69.11,38.56C69.84,37.81 70.98,37.81 71.71,38.56C72.44,39.3 72.44,40.45 71.71,41.19L66.94,46.02ZM62.94,56.92C64.08,56.92 65,56.01 65,54.88C65,53.76 64.08,52.85 62.94,52.85C61.8,52.85 60.88,53.76 60.88,54.88C60.88,56.01 61.8,56.92 62.94,56.92ZM45.06,56.92C46.2,56.92 47.13,56.01 47.13,54.88C47.13,53.76 46.2,52.85 45.06,52.85C43.92,52.85 43,53.76 43,54.88C43,56.01 43.92,56.92 45.06,56.92Z"
+      android:strokeColor="#00000000"
+      android:strokeWidth="1"/>
+</vector>

android/samples/sample-texture-target/src/main/res/drawable/ic_launcher_background.xml

@@ -0,0 +1,171 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportHeight="108"
+    android:viewportWidth="108">
+  <path
+      android:fillColor="#26A69A"
+      android:pathData="M0,0h108v108h-108z"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M9,0L9,108"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M19,0L19,108"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M29,0L29,108"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M39,0L39,108"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M49,0L49,108"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M59,0L59,108"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M69,0L69,108"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M79,0L79,108"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M89,0L89,108"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M99,0L99,108"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M0,9L108,9"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M0,19L108,19"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M0,29L108,29"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M0,39L108,39"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M0,49L108,49"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M0,59L108,59"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M0,69L108,69"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M0,79L108,79"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M0,89L108,89"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M0,99L108,99"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M19,29L89,29"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M19,39L89,39"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M19,49L89,49"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M19,59L89,59"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M19,69L89,69"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M19,79L89,79"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M29,19L29,89"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M39,19L39,89"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M49,19L49,89"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M59,19L59,89"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M69,19L69,89"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+  <path
+      android:fillColor="#00000000"
+      android:pathData="M79,19L79,89"
+      android:strokeColor="#33FFFFFF"
+      android:strokeWidth="0.8"/>
+</vector>

android/samples/sample-texture-target/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+  <background android:drawable="@drawable/ic_launcher_background"/>
+  <foreground android:drawable="@drawable/ic_launcher_foreground"/>
+</adaptive-icon>

android/samples/sample-texture-target/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+  <background android:drawable="@drawable/ic_launcher_background"/>
+  <foreground android:drawable="@drawable/ic_launcher_foreground"/>
+</adaptive-icon>

android/samples/sample-texture-target/src/main/res/values/colors.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+  <color name="colorPrimary">#3F51B5</color>
+  <color name="colorPrimaryDark">#303F9F</color>
+  <color name="colorAccent">#FF4081</color>
+</resources>

android/samples/sample-texture-target/src/main/res/values/strings.xml

@@ -0,0 +1,3 @@
+<resources>
+  <string name="app_name">Texture Target</string>
+</resources>

android/samples/sample-texture-target/src/main/res/values/styles.xml

@@ -0,0 +1,8 @@
+<resources>
+
+  <!-- Base application theme. -->
+  <style name="AppTheme" parent="android:Theme.Material.Light.DarkActionBar">
+    <!-- Customize your theme here. -->
+  </style>
+
+</resources>

android/settings.gradle

@@ -3,6 +3,7 @@ include ':filament-android'
 include ':filamat-android'
 include ':gltfio-android'
 include ':filament-utils-android'
+include ':filament-tools'
 
 // Samples
 include ':samples:sample-gltf-viewer'
@@ -17,7 +18,9 @@ include ':samples:sample-multi-view'
 include ':samples:sample-page-curl'
 include ':samples:sample-stream-test'
 include ':samples:sample-texture-view'
+include ':samples:sample-texture-target'
 include ':samples:sample-textured-object'
 include ':samples:sample-transparent-view'
+include ':samples:sample-render-validation'
 
 rootProject.name = 'filament'

build.sh

@@ -158,7 +158,7 @@ function print_fgviewer_help {
 }
 
 # Unless explicitly specified, NDK version will be selected as highest available version within same major release chain
-FILAMENT_NDK_VERSION=${FILAMENT_NDK_VERSION:-$(cat `dirname $0`/build/common/versions | grep GITHUB_NDK_VERSION | sed s/GITHUB_NDK_VERSION=//g | cut -f 1 -d ".")}
+FILAMENT_NDK_VERSION=$(cat `dirname $0`/build/common/versions | grep GITHUB_NDK_VERSION | sed s/GITHUB_NDK_VERSION=//g | cut -f 1 -d ".")
 
 # Internal variables
 ISSUE_CLEAN=false
@@ -214,8 +214,6 @@ ENABLE_PERFETTO=""
 
 BACKEND_DEBUG_FLAG_OPTION=""
 
-STEREOSCOPIC_OPTION=""
-
 OSMESA_OPTION=""
 
 IOS_BUILD_SIMULATOR=false
@@ -316,7 +314,6 @@ function build_desktop_target {
             ${ASAN_UBSAN_OPTION} \
             ${COVERAGE_OPTION} \
             ${BACKEND_DEBUG_FLAG_OPTION} \
-            ${STEREOSCOPIC_OPTION} \
             ${OSMESA_OPTION} \
             ${architectures} \
             ../..
@@ -455,7 +452,6 @@ function build_android_target {
             ${VULKAN_ANDROID_OPTION} \
             ${WEBGPU_OPTION} \
             ${BACKEND_DEBUG_FLAG_OPTION} \
-            ${STEREOSCOPIC_OPTION} \
             ${ENABLE_PERFETTO} \
             ../..
         ln -sf "out/cmake-android-${lc_target}-${arch}/compile_commands.json" \
@@ -556,11 +552,14 @@ function build_android {
         archive_android "Release"
     fi
 
+    local root_dir=$(pwd)
+
     pushd android > /dev/null
 
     if [[ "${ISSUE_DEBUG_BUILD}" == "true" ]]; then
         ./gradlew \
             -Pcom.google.android.filament.dist-dir=../out/android-debug/filament \
+            -Pcom.google.android.filament.tools-dir=${root_dir}/out/debug/filament \
             -Pcom.google.android.filament.abis=${ABI_GRADLE_OPTION} \
             ${VULKAN_ANDROID_GRADLE_OPTION} \
             ${WEBGPU_ANDROID_GRADLE_OPTION} \
@@ -573,6 +572,7 @@ function build_android {
 
         ./gradlew \
             -Pcom.google.android.filament.dist-dir=../out/android-debug/filament \
+            -Pcom.google.android.filament.tools-dir=${root_dir}/out/debug/filament \
             -Pcom.google.android.filament.abis=${ABI_GRADLE_OPTION} \
             ${WEBGPU_ANDROID_GRADLE_OPTION} \
             :filamat-android:assembleDebug
@@ -581,6 +581,7 @@ function build_android {
             for sample in ${ANDROID_SAMPLES}; do
                 ./gradlew \
                     -Pcom.google.android.filament.dist-dir=../out/android-debug/filament \
+                   -Pcom.google.android.filament.tools-dir=${root_dir}/out/debug/filament \
                     -Pcom.google.android.filament.abis=${ABI_GRADLE_OPTION} \
                     ${MATOPT_GRADLE_OPTION} \
                     :samples:${sample}:assembleDebug
@@ -613,6 +614,7 @@ function build_android {
     if [[ "${ISSUE_RELEASE_BUILD}" == "true" ]]; then
         ./gradlew \
             -Pcom.google.android.filament.dist-dir=../out/android-release/filament \
+            -Pcom.google.android.filament.tools-dir=${root_dir}/out/release/filament \
             -Pcom.google.android.filament.abis=${ABI_GRADLE_OPTION} \
             ${VULKAN_ANDROID_GRADLE_OPTION} \
             ${WEBGPU_ANDROID_GRADLE_OPTION} \
@@ -625,6 +627,7 @@ function build_android {
 
         ./gradlew \
             -Pcom.google.android.filament.dist-dir=../out/android-release/filament \
+            -Pcom.google.android.filament.tools-dir=${root_dir}/out/release/filament \
             -Pcom.google.android.filament.abis=${ABI_GRADLE_OPTION} \
             ${WEBGPU_ANDROID_GRADLE_OPTION} \
             :filamat-android:assembleRelease
@@ -633,6 +636,7 @@ function build_android {
             for sample in ${ANDROID_SAMPLES}; do
                 ./gradlew \
                     -Pcom.google.android.filament.dist-dir=../out/android-release/filament \
+                    -Pcom.google.android.filament.tools-dir=${root_dir}/out/release/filament \
                     -Pcom.google.android.filament.abis=${ABI_GRADLE_OPTION} \
                     ${MATOPT_GRADLE_OPTION} \
                     :samples:${sample}:assembleRelease
@@ -689,7 +693,6 @@ function build_ios_target {
             ${WEBGPU_OPTION} \
             ${MATDBG_OPTION} \
             ${MATOPT_OPTION} \
-            ${STEREOSCOPIC_OPTION} \
             ../..
         ln -sf "out/cmake-ios-${lc_target}-${arch}/compile_commands.json" \
            ../../compile_commands.json
@@ -1003,20 +1006,6 @@ while getopts ":hacCfgimp:q:uvWslwedtk:bVx:S:X:Py:" opt; do
             ;;
         x)  BACKEND_DEBUG_FLAG_OPTION="-DFILAMENT_BACKEND_DEBUG_FLAG=${OPTARG}"
             ;;
-        S)  case $(echo "${OPTARG}" | tr '[:upper:]' '[:lower:]') in
-                instanced)
-                    STEREOSCOPIC_OPTION="-DFILAMENT_SAMPLES_STEREO_TYPE=instanced"
-                    ;;
-                multiview)
-                    STEREOSCOPIC_OPTION="-DFILAMENT_SAMPLES_STEREO_TYPE=multiview"
-                    ;;
-                *)
-                    echo "Unknown stereoscopic type ${OPTARG}"
-                    echo "Type must be one of [instanced|multiview]"
-                    echo ""
-                    exit 1
-            esac
-            ;;
         X)  OSMESA_OPTION="-DFILAMENT_OSMESA_PATH=${OPTARG}"
             ;;
         y)

build/android/build.sh

@@ -18,8 +18,8 @@ if [[ "$GITHUB_WORKFLOW" ]]; then
     fi
 fi
 
-# Unless explicitly specified, NDK version will be set to match exactly the required one
-FILAMENT_NDK_VERSION=${GITHUB_NDK_VERSION:-27.0.11718014}
+# Unless explicitly specified, NDK version will be selected as highest available version within same major release chain
+FILAMENT_NDK_VERSION=$(cat `dirname $0`/../common/versions | grep GITHUB_NDK_VERSION | sed s/GITHUB_NDK_VERSION=//g)
 
 (! grep "${FILAMENT_NDK_VERSION}" `dirname $0`/../../android/build.gradle > /dev/null) &&
     echo "Mismatch of NDK versions: want ${FILAMENT_NDK_VERSION} and not found in android/build.gradle" &&

build/common/build-common.sh

@@ -34,6 +34,11 @@ if [[ "$TARGET" == "presubmit" ]]; then
     BUILD_RELEASE=release
 fi
 
+if [[ "$TARGET" == "presubmit-with-test" ]]; then
+    BUILD_RELEASE=release
+    RUN_TESTS=-u
+fi
+
 if [[ "$TARGET" == "debug" ]]; then
     BUILD_DEBUG=debug
     GENERATE_ARCHIVES=-a

build/common/test_list.txt

@@ -1,6 +1,5 @@
 libs/viewer/test_settings
 filament/test/test_filament --gtest_filter=-FilamentTest.FroxelData:FilamentExposureWithEngineTest.SetExposure:FilamentExposureWithEngineTest.ComputeEV100:RenderingTest.*
-filament/test/test_material_parser
 libs/math/test_math
 libs/image/test_image compare libs/image/tests/reference/
 libs/utils/test_utils

build/common/versions

@@ -3,7 +3,7 @@ GITHUB_CMAKE_VERSION=3.22.1
 GITHUB_NINJA_VERSION=1.10.2
 GITHUB_MESA_VERSION=24.2.1
 GITHUB_LLVM_VERSION=16
-GITHUB_NDK_VERSION=27.0.11718014
+GITHUB_NDK_VERSION=29.0.14206865
 GITHUB_EMSDK_VERSION=3.1.60
 GITHUB_VULKANSDK_VERSION=1.4.321.0
-GITHUB_GLTF_SAMPLE_ASSETS_COMMIT=d441dfdb87413ff412c620849a649d61789a470f
+GITHUB_GLTF_SAMPLE_ASSETS_COMMIT=d441dfdb87413ff412c620849a649d61789a470f

build/toolchain-aarch64-linux-android.cmake

@@ -75,7 +75,7 @@ set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
 #   C_FLAGS += -Wl,-pie
 #   CXX_FLAGS += -lstdc++
 
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIE -mcpu=cortex-a57" CACHE STRING "Toolchain CFLAGS")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIE -march=armv8-a -mtune=cortex-a78" CACHE STRING "Toolchain CFLAGS")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CMAKE_C_FLAGS}" CACHE STRING "Toolchain CXXFLAGS")
 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fPIE -pie -static-libstdc++" CACHE STRING "Toolchain LDFLAGS")
 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -static-libstdc++" CACHE STRING "Toolchain LDFLAGS")

build/toolchain-arm7-linux-android.cmake

@@ -87,7 +87,7 @@ set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
 # for hardfp: CFLAGS must have -mhard-float
 #             LDFLAGS must have -Wl,--no-warn-mismatch
 #
-set(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS} -mthumb -march=armv7-a -mcpu=cortex-a15 -mfloat-abi=softfp -mfpu=neon-vfpv4 -fPIE" CACHE STRING "Toolchain CFLAGS")
+set(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS} -mthumb -march=armv7-a -mfloat-abi=softfp -mfpu=neon-vfpv4 -fPIE" CACHE STRING "Toolchain CFLAGS")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CMAKE_C_FLAGS}" CACHE STRING "Toolchain CXXFLAGS")
 set(CMAKE_EXE_LINKER_FLAGS    "${CMAKE_EXE_LINKER_FLAGS}    -march=armv7-a -Wl,--no-warn-mismatch -L${TOOLCHAIN}/arm-linux-androideabi/lib/armv7-a -static-libstdc++ -fPIE -pie" CACHE STRING "Toolchain LDFLAGS")
 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -march=armv7-a -Wl,--no-warn-mismatch -L${TOOLCHAIN}/arm-linux-androideabi/lib/armv7-a -static-libstdc++" CACHE STRING "Toolchain LDFLAGS")

docs/Materials.md.html

@@ -97,6 +97,7 @@ in table [standardProperties].
 **transmission**        | Defines how much of the diffuse light of a dielectric is transmitted through the object, in other words this defines how transparent an object is
 **ior**                 | Index of refraction, either for refractive objects or as an alternative to reflectance
 **microThickness**      | Thickness of the thin layer of refractive objects
+**dispersion**          | Strength of the dispersion effect for refractive objects, specified as 20/Abbe number
 **bentNormal**          | A normal pointing in the average unoccluded direction. Can be used to improve indirect lighting quality
 **shadowStrength**      | Strength factor between 0 and 1 for all shadows received by this material
 [Table [standardProperties]: Properties of the standard model]
@@ -126,6 +127,7 @@ The type and range of each property is described in table [standardPropertiesTyp
 **absorption**          | float3   |  [0..n]                  |
 **microThickness**      | float    |  [0..n]                  |
 **thickness**           | float    |  [0..n]                  |
+**dispersion**          | float    |  [0..n]                  | Realistic values are between [0, 1], with the exception of Rutile, which has a value of 2.04
 [Table [standardPropertiesTypes]: Range and type of the standard model's properties]
 
 
@@ -153,13 +155,14 @@ The type and range of each property is described in table [standardPropertiesTyp
     as-is, which can lead to physically impossible materials, however, this might be desirable
     for artistic reasons.
 
-!!! Note: About `thickness` and `microThickness` for refraction
+!!! Note: About `thickness`, `microThickness` and `dispersion` for refraction
     `thickness` represents the thickness of solid objects in the direction of the normal, for
     satisfactory results, this should be provided per fragment (e.g.: as a texture) or at least per
     vertex. `microThickness` represent the thickness of the thin layer of an object, and can
     generally be provided as a constant value. For example, a 1mm thin hollow sphere of radius 1m,
-    would have a `thickness` of 1 and a `microThickness` of 0.001. Currently `thickness` is not
-    used when `refractionType` is set to `thin`.
+    would have a `thickness` of 1 and a `microThickness` of 0.001. Dispersion controls the angular
+    separation of colors transmitting through a volume, and can be set by a constant value.
+    Currently `thickness` and `dispersion` are not used when `refractionType` is set to `thin`.
 
 ### Base color
 
@@ -651,6 +654,26 @@ the `refractionType` is set to `solid` and `absorption` coefficients are set.
 ![Figure [varyingThickness]: `thickness` varying from 0.0 at the top of the prism to 3.0 at the
 bottom of the prism](images/material_thickness.png)
 
+### Dispersion
+
+The dispersion property controls the angular separation of colors transmitting through a relatively
+clear volume. It can only be used when `refractionType` is set to `volume`.
+Its value is specified as 20/Abbe number. When the value is zero, no dispersion is used.
+
+Table [commonMatDispersion] describes acceptable dispersion values for various types of materials.
+
+Material                   |   Abbe Number (V)	|  Dispersion (20/V)
+--------------------------:|:------------------:|:-----------------
+Rutile                     | 9.8                | 2.04
+Polycarbonate              | 32                 | 0.625
+Diamond                    | 55                 | 0.36
+Water                      | 55                 | 0.36
+Crown Glass                | 59                 | 0.33
+[Table [commonMatDispersion]: Dispersion of common materials]
+
+![Figure [dispersionProperty]: `dispersion` varying from 0.0
+(left) to 5.0 (right)](images/materials/dispersion.png)
+
 ## Subsurface model
 
 ### Thickness
@@ -2276,6 +2299,7 @@ struct MaterialInputs {
     float3 absorption;          // default float3(0.0, 0.0, 0.0)
     float ior;                  // default: 1.5
     float microThickness;       // default: 0.0, not available with refractionType "solid"
+    float dispersion;           // default: 0.0, not available with refractionType "thin"
 }
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
@@ -2456,9 +2480,9 @@ type aliases:
 **uint2**                        | uvec2        |  A vector of 2 unsigned integers
 **uint3**                        | uvec3        |  A vector of 3 unsigned integers
 **uint4**                        | uvec4        |  A vector of 4 unsigned integers
-**float2**                       | float2       |  A vector of 2 floats
-**float3**                       | float3       |  A vector of 3 floats
-**float4**                       | float4       |  A vector of 4 floats
+**float2**                       | vec2         |  A vector of 2 floats
+**float3**                       | vec3         |  A vector of 3 floats
+**float4**                       | vec4         |  A vector of 4 floats
 **float4x4**                     | mat4         |  A 4x4 float matrix
 **float3x3**                     | mat3         |  A 3x3 float matrix
 

docs/build/windows_android.html

@@ -3,7 +3,7 @@
     <head>
         <!-- Book generated using mdBook -->
         <meta charset="UTF-8">
-        <title>Build for Android on Windows - Filament</title>
+        <title>Android on Windows - Filament</title>
 
 
         <!-- Custom HTML head -->
@@ -273,7 +273,7 @@ copy filament-android\build\outputs\aar\filament-android-release.aar ..\..\out\
                                 <i class="fa fa-angle-left"></i>
                             </a>
 
-                            <a rel="next prefetch" href="../build/maven_release.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
+                            <a rel="next prefetch" href="../dup/contributing.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
                                 <i class="fa fa-angle-right"></i>
                             </a>
 
@@ -287,7 +287,7 @@ copy filament-android\build\outputs\aar\filament-android-release.aar ..\..\out\
                         <i class="fa fa-angle-left"></i>
                     </a>
 
-                    <a rel="next prefetch" href="../build/maven_release.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
+                    <a rel="next prefetch" href="../dup/contributing.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
                         <i class="fa fa-angle-right"></i>
                     </a>
             </nav>

docs/dup/backend_test.html

@@ -0,0 +1,255 @@
+<!DOCTYPE HTML>
+<html lang="en" class="light sidebar-visible" dir="ltr">
+    <head>
+        <!-- Book generated using mdBook -->
+        <meta charset="UTF-8">
+        <title>backend - Filament</title>
+
+
+        <!-- Custom HTML head -->
+
+        <meta name="description" content="">
+        <meta name="viewport" content="width=device-width, initial-scale=1">
+        <meta name="theme-color" content="#ffffff">
+
+        <link rel="shortcut icon" href="../favicon.png">
+        <link rel="stylesheet" href="../css/variables.css">
+        <link rel="stylesheet" href="../css/general.css">
+        <link rel="stylesheet" href="../css/chrome.css">
+
+        <!-- Fonts -->
+        <link rel="stylesheet" href="../FontAwesome/css/font-awesome.css">
+        <link rel="stylesheet" href="../fonts/fonts.css">
+
+        <!-- Highlight.js Stylesheets -->
+        <link rel="stylesheet" href="../highlight.css">
+        <link rel="stylesheet" href="../tomorrow-night.css">
+        <link rel="stylesheet" href="../ayu-highlight.css">
+
+        <!-- Custom theme stylesheets -->
+
+        <!-- MathJax -->
+        <script async src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
+
+        <!-- Provide site root to javascript -->
+        <script>
+            var path_to_root = "../";
+            var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "light" : "light";
+        </script>
+        <!-- Start loading toc.js asap -->
+        <script src="../toc.js"></script>
+    </head>
+    <body>
+    <div id="body-container">
+        <!-- Work around some values being stored in localStorage wrapped in quotes -->
+        <script>
+            try {
+                var theme = localStorage.getItem('mdbook-theme');
+                var sidebar = localStorage.getItem('mdbook-sidebar');
+
+                if (theme.startsWith('"') && theme.endsWith('"')) {
+                    localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1));
+                }
+
+                if (sidebar.startsWith('"') && sidebar.endsWith('"')) {
+                    localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1));
+                }
+            } catch (e) { }
+        </script>
+
+        <!-- Set the theme before any content is loaded, prevents flash -->
+        <script>
+            var theme;
+            try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
+            if (theme === null || theme === undefined) { theme = default_theme; }
+            const html = document.documentElement;
+            html.classList.remove('light')
+            html.classList.add(theme);
+            html.classList.add("js");
+        </script>
+
+        <input type="checkbox" id="sidebar-toggle-anchor" class="hidden">
+
+        <!-- Hide / unhide sidebar before it is displayed -->
+        <script>
+            var sidebar = null;
+            var sidebar_toggle = document.getElementById("sidebar-toggle-anchor");
+            if (document.body.clientWidth >= 1080) {
+                try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
+                sidebar = sidebar || 'visible';
+            } else {
+                sidebar = 'hidden';
+            }
+            sidebar_toggle.checked = sidebar === 'visible';
+            html.classList.remove('sidebar-visible');
+            html.classList.add("sidebar-" + sidebar);
+        </script>
+
+        <nav id="sidebar" class="sidebar" aria-label="Table of contents">
+            <div style="display:flex;align-items:center;justify-content:center">
+                <img class="flogo" src="../images/filament_logo_small.png"></img>
+            </div>
+            <!-- populated by js -->
+            <mdbook-sidebar-scrollbox class="sidebar-scrollbox"></mdbook-sidebar-scrollbox>
+            <noscript>
+                <iframe class="sidebar-iframe-outer" src="../toc.html"></iframe>
+            </noscript>
+            <div id="sidebar-resize-handle" class="sidebar-resize-handle">
+                <div class="sidebar-resize-indicator"></div>
+            </div>
+        </nav>
+
+        <div id="page-wrapper" class="page-wrapper">
+
+            <div class="page">
+                <div id="menu-bar-hover-placeholder"></div>
+                <div id="menu-bar" class="menu-bar sticky">
+                    <div class="left-buttons">
+                        <label id="sidebar-toggle" class="icon-button" for="sidebar-toggle-anchor" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar">
+                            <i class="fa fa-bars"></i>
+                        </label>
+                        <!-- Filament: disable themes because the markdeep part does not look good for dark themes -->
+                        <!--
+                        <button id="theme-toggle" class="icon-button" type="button" title="Change theme" aria-label="Change theme" aria-haspopup="true" aria-expanded="false" aria-controls="theme-list">
+                            <i class="fa fa-paint-brush"></i>
+                        </button>
+                        <ul id="theme-list" class="theme-popup" aria-label="Themes" role="menu">
+                            <li role="none"><button role="menuitem" class="theme" id="light">Light</button></li>
+                            <li role="none"><button role="menuitem" class="theme" id="rust">Rust</button></li>
+                            <li role="none"><button role="menuitem" class="theme" id="coal">Coal</button></li>
+                            <li role="none"><button role="menuitem" class="theme" id="navy">Navy</button></li>
+                            <li role="none"><button role="menuitem" class="theme" id="ayu">Ayu</button></li>
+                        </ul>
+                        -->
+                        <button id="search-toggle" class="icon-button" type="button" title="Search. (Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar">
+                            <i class="fa fa-search"></i>
+                        </button>
+                    </div>
+
+                    <h1 class="menu-title">Filament</h1>
+
+                    <div class="right-buttons">
+                        <a href="https://github.com/google/filament" title="Git repository" aria-label="Git repository">
+                            <i id="git-repository-button" class="fa fa-github"></i>
+                        </a>
+
+                    </div>
+                </div>
+
+                <div id="search-wrapper" class="hidden">
+                    <form id="searchbar-outer" class="searchbar-outer">
+                        <input type="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header">
+                    </form>
+                    <div id="searchresults-outer" class="searchresults-outer hidden">
+                        <div id="searchresults-header" class="searchresults-header"></div>
+                        <ul id="searchresults">
+                        </ul>
+                    </div>
+                </div>
+
+                <!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM -->
+                <script>
+                    document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible');
+                    document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible');
+                    Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) {
+                        link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
+                    });
+                </script>
+
+                <div id="content" class="content">
+                    <main>
+                        <h1 id="backend-unit-tests"><a class="header" href="#backend-unit-tests">Backend Unit Tests</a></h1>
+<p>These are tests that ensure the Filament backend is working properly on various operating systems
+and graphics backends.</p>
+<p>The majority of these tests generate images that are then compared against a known golden image.</p>
+<h2 id="running-with-a-specific-graphics-library"><a class="header" href="#running-with-a-specific-graphics-library">Running with a specific graphics library</a></h2>
+<p>Run with <code>-a&lt;backend&gt;</code> to run with a specific backend, such as <code>-avulkan</code> for vulkan or <code>-ametal</code>
+for metal.</p>
+<h2 id="image-comparisons"><a class="header" href="#image-comparisons">Image comparisons</a></h2>
+<p>The expected images are stored as PNG files in the <code>expected_images</code> subdirectory of the test source
+code. When cmake is run it will copy this directory to the build output creating
+<code>images/expected_images</code> inside the same directory as the unit test binary.</p>
+<p>The unit tests will then write their resulting images into <code>images/actual_images</code> in order to make
+the tests easier to debug.</p>
+<p>If an image comparison test fails, it writes a diff image to <code>images/diff_images</code> where each pixel of the diff is white (255,255,255) if the comparison for the corresponding pixel succeeds and black (0,0,0) of the comparison for the corresponding pixel fails.</p>
+<h3 id="python-utility-for-updating-golden-images-and-comparing-results"><a class="header" href="#python-utility-for-updating-golden-images-and-comparing-results">Python utility for updating golden images and comparing results</a></h3>
+<p>Inside the unit test source code directory there is a python script called
+<code>move_actual_images_to_expected.py</code>.
+It will display the actual and expected images side-by-side and copy the actual image into the
+source tree's <code>expected_images</code> directory if the user approves the change.</p>
+<h4 id="directories"><a class="header" href="#directories">Directories</a></h4>
+<p>The <code>-r</code> flag is required and should be the directory where the test binary is.</p>
+<p>If not running the script from the directory it's in, <code>-s</code> should be the source code's
+<code>expected_images</code> directory.</p>
+<h4 id="configuring-comparemove-behavior"><a class="header" href="#configuring-comparemove-behavior">Configuring compare/move behavior</a></h4>
+<p>The <code>-c</code> flag has the tool display the actual and expected images side-by-side. By default it
+does this by opening both with the OS's default behavior. <code>-p</code> can be used to specify a different
+terminal program.</p>
+<p>The <code>-m</code> flag has the tool move the actual image to overwrite the expected image in the source
+tree. If the images are also being compared then the move will only happen if the user approves the
+change.</p>
+<p>After updating the expected images, cmake will need to be run again to copy them to the binary's
+directory. Also, currently some platforms can't load images to compare and so have the hash
+hardcoded into the test source code, so for now those need to be updated by running the test and
+copying the value manually.</p>
+<h4 id="picking-which-tests-to-compare"><a class="header" href="#picking-which-tests-to-compare">Picking which tests to compare</a></h4>
+<p>The <code>-x</code> flag causes the tool to check the <code>test_detail.xml</code> file and only process the images who
+failed a comparison. <code>--gtest_output=xml</code> needs to be passed to the test binary to generate this
+file.</p>
+<p>The <code>-t</code> argument takes a list of images to compare, provided as the file name without the <code>.png</code>
+suffix.</p>
+<h2 id="unsupported-tests"><a class="header" href="#unsupported-tests">Unsupported tests</a></h2>
+<p>If a test depends on a feature that is unsupported by the current environment, it will start with
+the <code>SKIP_IF</code> macro. This will cause the test to not be run.</p>
+
+                    </main>
+
+                    <nav class="nav-wrapper" aria-label="Page navigation">
+                        <!-- Mobile navigation buttons -->
+                            <a rel="prev" href="../notes/tests.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
+                                <i class="fa fa-angle-left"></i>
+                            </a>
+
+                            <a rel="next prefetch" href="../dup/test_ci_backend.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
+                                <i class="fa fa-angle-right"></i>
+                            </a>
+
+                        <div style="clear: both"></div>
+                    </nav>
+                </div>
+            </div>
+
+            <nav class="nav-wide-wrapper" aria-label="Page navigation">
+                    <a rel="prev" href="../notes/tests.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
+                        <i class="fa fa-angle-left"></i>
+                    </a>
+
+                    <a rel="next prefetch" href="../dup/test_ci_backend.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
+                        <i class="fa fa-angle-right"></i>
+                    </a>
+            </nav>
+
+        </div>
+
+
+
+
+        <script>
+            window.playground_copyable = true;
+        </script>
+
+
+        <script src="../elasticlunr.min.js"></script>
+        <script src="../mark.min.js"></script>
+        <script src="../searcher.js"></script>
+
+        <script src="../clipboard.min.js"></script>
+        <script src="../highlight.js"></script>
+        <script src="../book.js"></script>
+
+        <!-- Custom JS scripts -->
+
+
+    </div>
+    </body>
+</html>

docs/dup/bluevk.html

@@ -158,7 +158,8 @@
 
                 <div id="content" class="content">
                     <main>
-                        <h2 id="updating-vulkan-headers"><a class="header" href="#updating-vulkan-headers">Updating Vulkan headers</a></h2>
+                        <h1 id="bluevk"><a class="header" href="#bluevk">bluevk</a></h1>
+<h2 id="updating-vulkan-headers"><a class="header" href="#updating-vulkan-headers">Updating Vulkan headers</a></h2>
 <p>To update the Vulkan headers, perform the following steps.</p>
 <p>First, find the latest version of the Vulkan headers here:
 https://github.com/KhronosGroup/Vulkan-Headers/tags</p>

docs/dup/building.html

@@ -158,8 +158,8 @@
 
                 <div id="content" class="content">
                     <main>
-                        <h2 id="building-filament"><a class="header" href="#building-filament">Building Filament</a></h2>
-<h3 id="prerequisites"><a class="header" href="#prerequisites">Prerequisites</a></h3>
+                        <h1 id="building-filament"><a class="header" href="#building-filament">Building Filament</a></h1>
+<h2 id="prerequisites"><a class="header" href="#prerequisites">Prerequisites</a></h2>
 <p>To build Filament, you must first install the following tools:</p>
 <ul>
 <li>CMake 3.22.1 (or more recent)</li>
@@ -175,14 +175,14 @@ section below.</p>
 <li>Android NDK 25.1 or higher</li>
 <li>Java 17</li>
 </ul>
-<h3 id="environment-variables"><a class="header" href="#environment-variables">Environment variables</a></h3>
+<h2 id="environment-variables"><a class="header" href="#environment-variables">Environment variables</a></h2>
 <p>To build Filament for Android, make sure the environment variable <code>ANDROID_HOME</code> points to the
 location of your Android SDK.</p>
 <p>When building for WebGL, you'll also need to set <code>EMSDK</code>. See <a href="#webassembly">WebAssembly</a>.</p>
 <h3 id="ide"><a class="header" href="#ide">IDE</a></h3>
 <p>We recommend using CLion to develop for Filament. Simply open the root directory's CMakeLists.txt
 in CLion to obtain a usable project.</p>
-<h3 id="easy-build"><a class="header" href="#easy-build">Easy build</a></h3>
+<h2 id="easy-build"><a class="header" href="#easy-build">Easy build</a></h2>
 <p>Once the required OS specific dependencies listed below are installed, you can use the script
 located in <code>build.sh</code> to build Filament easily on macOS and Linux.</p>
 <p>This script can be invoked from anywhere and will produce build artifacts in the <code>out/</code> directory
@@ -206,7 +206,7 @@ The script offers more features described by executing <code>build.sh -h</code>.
 <li><code>-t</code>: <a href="https://google.github.io/filament/dup/fgviewer.html"><code>fgviewer</code></a></li>
 <li><code>-b</code> and <code>-y</code>: <a href="https://google.github.io/filament/notes/asan_ubsan.html">ASAN/UBSAN builds</a></li>
 </ul>
-<h3 id="filament-specific-cmake-options"><a class="header" href="#filament-specific-cmake-options">Filament-specific CMake Options</a></h3>
+<h2 id="filament-specific-cmake-options"><a class="header" href="#filament-specific-cmake-options">Filament-specific CMake Options</a></h2>
 <p>The following CMake options are boolean options specific to Filament:</p>
 <ul>
 <li><code>FILAMENT_ENABLE_LTO</code>:           Enable link-time optimizations if supported by the compiler</li>
@@ -223,7 +223,7 @@ The script offers more features described by executing <code>build.sh -h</code>.
 cmake . -DOPTION=ON       # Replace OPTION with the option name, set to ON / OFF
 </code></pre>
 <p>Options can also be set with the CMake GUI.</p>
-<h3 id="linux"><a class="header" href="#linux">Linux</a></h3>
+<h2 id="linux"><a class="header" href="#linux">Linux</a></h2>
 <p>Make sure you've installed the following dependencies:</p>
 <ul>
 <li><code>clang-16</code> or higher</li>
@@ -265,7 +265,7 @@ update-alternatives --install /usr/bin/c++ c++ /usr/bin/clang++ 100
 <pre><code class="language-shell">ninja
 </code></pre>
 <p>This will build Filament, its tests and samples, and various host tools.</p>
-<h3 id="macos"><a class="header" href="#macos">macOS</a></h3>
+<h2 id="macos"><a class="header" href="#macos">macOS</a></h2>
 <p>To compile Filament you must have the most recent version of Xcode installed and you need to
 make sure the command line tools are setup by running:</p>
 <pre><code class="language-shell">xcode-select --install
@@ -278,14 +278,14 @@ cd out/cmake-release
 cmake -G Ninja -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=../release/filament ../..
 ninja
 </code></pre>
-<h3 id="ios"><a class="header" href="#ios">iOS</a></h3>
+<h2 id="ios"><a class="header" href="#ios">iOS</a></h2>
 <p>The easiest way to build Filament for iOS is to use <code>build.sh</code> and the
 <code>-p ios</code> flag. For instance to build the debug target:</p>
 <pre><code class="language-shell">./build.sh -p ios debug
 </code></pre>
 <p>See <a href="./ios/samples/README.html">ios/samples/README.md</a> for more information.</p>
-<h3 id="windows"><a class="header" href="#windows">Windows</a></h3>
-<h4 id="building-on-windows-with-visual-studio-2019-or-later"><a class="header" href="#building-on-windows-with-visual-studio-2019-or-later">Building on Windows with Visual Studio 2019 or later</a></h4>
+<h2 id="windows"><a class="header" href="#windows">Windows</a></h2>
+<h3 id="building-on-windows-with-visual-studio-2019-or-later"><a class="header" href="#building-on-windows-with-visual-studio-2019-or-later">Building on Windows with Visual Studio 2019 or later</a></h3>
 <p>Install the following components:</p>
 <ul>
 <li><a href="https://www.visualstudio.com/downloads">Visual Studio 2019 or later</a></li>
@@ -314,7 +314,7 @@ target in the <em>Solution Explorer</em> and choose <em>Build</em> to build a sp
 <code>out</code> folder run the following command.</p>
 <pre><code class="language-bat">cmake --build . --target gltf_viewer --config Release
 </code></pre>
-<h3 id="android"><a class="header" href="#android">Android</a></h3>
+<h2 id="android"><a class="header" href="#android">Android</a></h2>
 <p>Before building Filament for Android, make sure to build Filament for your host. Some of the
 host tools are required to successfully build for Android.</p>
 <p>Filament can be built for the following architectures:</p>
@@ -327,13 +327,42 @@ host tools are required to successfully build for Android.</p>
 <p>Note that the main target is the ARM 64-bit target. Our implementation is optimized first and
 foremost for <code>arm64-v8a</code>.</p>
 <p>To build Android on Windows machines, see <a href="android/Windows.html">android/Windows.md</a>.</p>
-<h4 id="easy-android-build"><a class="header" href="#easy-android-build">Easy Android build</a></h4>
+<h3 id="important-sdk-location"><a class="header" href="#important-sdk-location">Important: SDK location</a></h3>
+<p>Either ensure your <code>ANDROID_HOME</code> environment variable is set or make sure the root project
+contains a <code>local.properties</code> file with the <code>sdk.dir</code> property pointing to your installation of
+the Android SDK.</p>
+<h3 id="easy-android-build"><a class="header" href="#easy-android-build">Easy Android build</a></h3>
 <p>The easiest way to build Filament for Android is to use <code>build.sh</code> and the
 <code>-p android</code> flag. For instance to build the release target:</p>
 <pre><code class="language-shell">./build.sh -p android release
 </code></pre>
+<p>To build a sample (such as <code>android/samples/sample-hello-triangle</code>) for an ARM 64-bit phone, you would run</p>
+<pre><code class="language-shell">./build.sh -p android -q arm64-v8a -k sample-hello-triangle release
+</code></pre>
+<p>The output APK can be found in <code>android/samples/sample-hello-triangle/build/outputs/apk/release/sample-hello-triangle-release-unsigned.apk</code></p>
 <p>Run <code>build.sh -h</code> for more information.</p>
-<h4 id="manual-builds"><a class="header" href="#manual-builds">Manual builds</a></h4>
+<h3 id="android-studio"><a class="header" href="#android-studio">Android Studio</a></h3>
+<p>You must use the latest stable release of Android Studio.</p>
+<p>The Android build of filament is separated into java/kotlin client APIs, a layer of jni bindings
+that bridges java/kotlin with native code, and Filament and other component code that have been compiled
+into architecture-specific libraries. Our default Android Studio gradle setup can compile java/kotlin and
+the jni bindings for you, but it will treat the filament libraries as already compiled and present on
+the system.</p>
+<p>Therefore, before compiling the sample app or any other targets, you must
+make sure that the native filament libraries have been compiled and are located at a prescribed location
+so that the jni bindings can link against them. You can do so by using the easy build script</p>
+<pre><code class="language-shell">./build.sh -p android release -q arm64-v8a
+</code></pre>
+<p>Note that the above step will also install host machine tools into prescribed locations.  These tools are
+required for compiling Filament assets such as materials and environment maps.</p>
+<p>Now we are ready to compile the apps.  To open the project, point Studio to the <code>android</code> folder.
+After opening the project and syncing with Gradle, select the sample of your choice
+using the drop-down widget in the toolbar. Additionally, you will need to select a deployment target.
+By doing so, Android Studio will automatically try to compile the app only for that specific
+device's architecture. So if you are targeting a new Pixel phone, make sure that the step above
+(compiling the library) is targeting ARM 64-bit (<code>-q arm64-v8a</code> ), and if you are running the app on
+an emulator on a Linux machine with an x86 64-bit chipset, you would indicate (<code>-q x86_64</code>) in the above step.</p>
+<h3 id="manual-builds"><a class="header" href="#manual-builds">Manual builds</a></h3>
 <p>Invoke CMake in a build directory of your choice, inside of filament's directory. The commands
 below show how to build Filament for ARM 64-bit (<code>aarch64</code>).</p>
 <pre><code class="language-shell">mkdir out/android-build-release-aarch64
@@ -350,7 +379,7 @@ cmake -G Ninja -DCMAKE_TOOLCHAIN_FILE=../../build/toolchain-aarch64-linux-androi
 <p>This will generate Filament's Android binaries in <code>out/android-release</code>. This location is important
 to build the Android Studio projects located in <code>filament/android</code>. After install, the library
 binaries should be found in <code>out/android-release/filament/lib/arm64-v8a</code>.</p>
-<h4 id="aar"><a class="header" href="#aar">AAR</a></h4>
+<h3 id="aar"><a class="header" href="#aar">AAR</a></h3>
 <p>Before you attempt to build the AAR, make sure you've compiled and installed the native libraries
 as explained in the sections above. You must have the following ABIs built in
 <code>out/android-release/filament/lib/</code>:</p>
@@ -376,7 +405,7 @@ AAR.</p>
 </code></pre>
 <p>The <code>-Pcom.google.android.filament.dist-dir</code> can be used to specify a different installation
 directory (it must match the CMake install prefix used in the previous steps).</p>
-<h4 id="using-filaments-aar"><a class="header" href="#using-filaments-aar">Using Filament's AAR</a></h4>
+<h3 id="using-filaments-aar"><a class="header" href="#using-filaments-aar">Using Filament's AAR</a></h3>
 <p>Create a new module in your project and select <em>Import .JAR or .AAR Package</em> when prompted. Make
 sure to add the newly created module as a dependency to your application.</p>
 <p>If you do not wish to include all supported ABIs, make sure to create the appropriate flavors in
@@ -412,7 +441,7 @@ productFlavors {
     }
 }
 </code></pre>
-<h3 id="webassembly"><a class="header" href="#webassembly">WebAssembly</a></h3>
+<h2 id="webassembly"><a class="header" href="#webassembly">WebAssembly</a></h2>
 <p>The core Filament library can be cross-compiled to WebAssembly from either macOS or Linux. To get
 started, follow the instructions for building Filament on your platform (<a href="#macos">macOS</a> or
 <a href="#linux">linux</a>), which will ensure you have the proper dependencies installed.</p>

docs/dup/contributing.html

@@ -209,7 +209,7 @@ as possible. The current external dependencies of the runtime library include:</
 
                     <nav class="nav-wrapper" aria-label="Page navigation">
                         <!-- Mobile navigation buttons -->
-                            <a rel="prev" href="../build/maven_release.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
+                            <a rel="prev" href="../build/windows_android.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
                                 <i class="fa fa-angle-left"></i>
                             </a>
 
@@ -223,7 +223,7 @@ as possible. The current external dependencies of the runtime library include:</
             </div>
 
             <nav class="nav-wide-wrapper" aria-label="Page navigation">
-                    <a rel="prev" href="../build/maven_release.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
+                    <a rel="prev" href="../build/windows_android.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
                         <i class="fa fa-angle-left"></i>
                     </a>
 

docs/dup/docs.html

@@ -203,7 +203,7 @@ tree into <code>docs_src/src_mdbook/src/dup</code>. Moreover, to restore valid l
 to perform a number of URL replacements in addition to the copy. These replacements are
 described in <a href="https://github.com/google/filament/blob/main/docs_src/build/duplicates.json"><code>docs_src/build/duplicates.json</code></a>.</p>
 <h3 id="core-concept-docs"><a class="header" href="#core-concept-docs">Core concept docs</a></h3>
-<p>The primary design of Filament as a phyiscally-based renderer and details of its materials
+<p>The primary design of Filament as a physically-based renderer and details of its materials
 system are described in <code>Filament.md.html</code> and <code>Materials.md.html</code>, respectively. These two
 documents are written in <a href="https://casual-effects.com/markdeep/"><code>markdeep</code></a>. To embed them into our book, we</p>
 <ol>
@@ -253,7 +253,7 @@ add a link in <code>SUMMARY.md</code>, and perform the steps outlined in
 
                     <nav class="nav-wrapper" aria-label="Page navigation">
                         <!-- Mobile navigation buttons -->
-                            <a rel="prev" href="../notes/release_guide.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
+                            <a rel="prev" href="../release/branching.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
                                 <i class="fa fa-angle-left"></i>
                             </a>
 
@@ -267,7 +267,7 @@ add a link in <code>SUMMARY.md</code>, and perform the steps outlined in
             </div>
 
             <nav class="nav-wide-wrapper" aria-label="Page navigation">
-                    <a rel="prev" href="../notes/release_guide.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
+                    <a rel="prev" href="../release/branching.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
                         <i class="fa fa-angle-left"></i>
                     </a>