wgpu: code clean up based on feedback

which is needed to draw the triangle if the test is enabled.

.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
@@ -179,7 +179,7 @@ jobs:
           fetch-depth: 0
       - uses: ./.github/actions/linux-prereq
       - name: Run build script
-        run: ./build.sh -W debug test_filamat filament
+        run: ./build.sh -W debug test_filamat filament gltf_viewer
       - name: Run test
         run: ./out/cmake-debug/libs/filamat/test_filamat --gtest_filter=MaterialCompiler.Wgsl*
 
@@ -203,3 +203,23 @@ jobs:
           ./build.sh -p desktop debug gltf_viewer
       - name: Run test
         run: bash test/code-correctness/test.sh
+
+  test-backend:
+    name: test-backend
+    runs-on: macos-14-xlarge
+    steps:
+      - uses: actions/checkout@v4.1.6
+        with:
+          fetch-depth: 0
+      - uses: ./.github/actions/mac-prereq
+      - uses: ./.github/actions/get-mesa
+      - uses: ./.github/actions/get-vulkan-sdk
+      - name: Prerequisites
+        run: |
+          # Must have at least clang-16 for a webgpu/dawn build.
+          sudo xcode-select -s /Applications/Xcode_16.2.app/Contents/Developer
+        shell: bash
+      - name: Run backend tests
+        shell: bash
+        run: |
+          bash test/backend/test.sh

.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.
@@ -62,7 +62,12 @@ force a clean build by adding the `-c` flag in that case.
 To install the libraries and executables in `out/debug/` and `out/release/`, add the `-i` flag.
 The script offers more features described by executing `build.sh -h`.
 
-### Filament-specific CMake Options
+For more specialized options, please also consider the following pages:
+ - `-d`: [`matdbg`](https://google.github.io/filament/dup/matdbg.html)
+ - `-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
 
 The following CMake options are boolean options specific to Filament:
 
@@ -84,7 +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:
 
@@ -143,7 +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:
@@ -164,7 +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:
@@ -175,9 +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:
 
@@ -220,7 +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.
@@ -237,7 +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:
@@ -246,9 +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`).
@@ -276,7 +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
@@ -308,7 +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.
@@ -349,7 +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 "")
@@ -56,6 +57,10 @@ option(FILAMENT_ENABLE_FGVIEWER "Enable the frame graph viewer" OFF)
 
 option(FILAMENT_USE_ABSEIL_LOGGING "Use Abseil to log, may increase binary size" OFF)
 
+option(FILAMENT_ENABLE_EXPERIMENTAL_GCC_SUPPORT "Enable GCC support (unsupported)" OFF)
+
+option(FILAMENT_SUPPORTS_WEBP_TEXTURES "Enable webp texture support for Filament (builds libwebp when ON)" OFF)
+
 # This is to disable GTAO for the short-term while we investigate a way to better manage size increases.
 # On the regular filament build (where size is of less concern), we enable GTAO by default.
 option(FILAMENT_DISABLE_GTAO "Disable GTAO" OFF)
@@ -295,15 +300,10 @@ set(TOOLS ${CMAKE_CURRENT_SOURCE_DIR}/tools)
 # ==================================================================================================
 set(MIN_CLANG_VERSION "6.0")
 
-if (CMAKE_C_COMPILER_ID MATCHES "Clang")
-    if (CMAKE_C_COMPILER_VERSION VERSION_LESS MIN_CLANG_VERSION)
-        message(FATAL_ERROR "Detected C compiler Clang ${CMAKE_C_COMPILER_VERSION} < ${MIN_CLANG_VERSION}")
-    endif()
-elseif (NOT MSVC)
-    message(FATAL_ERROR "Detected C compiler ${CMAKE_C_COMPILER_ID} is unsupported")
-endif()
-
-if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+set(FILAMENT_USING_GCC OFF)
+if (CMAKE_C_COMPILER_ID MATCHES "GNU" AND FILAMENT_ENABLE_EXPERIMENTAL_GCC_SUPPORT)
+    set(FILAMENT_USING_GCC ON)
+elseif (CMAKE_C_COMPILER_ID MATCHES "Clang")
     if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS MIN_CLANG_VERSION)
         message(FATAL_ERROR "Detected CXX compiler Clang ${CMAKE_CXX_COMPILER_VERSION} < ${MIN_CLANG_VERSION}")
     endif()
@@ -344,7 +344,11 @@ if (MSVC)
     set(CXX_STANDARD "/std:c++latest")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CXX_STANDARD} /W0 /Zc:__cplusplus")
 else()
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CXX_STANDARD} -fstrict-aliasing -Wno-unknown-pragmas -Wno-unused-function -Wno-deprecated-declarations")
+    if(FILAMENT_USING_GCC)
+      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CXX_STANDARD} -Wno-changes-meaning -Wno-return-type -Wno-attributes -Wno-unknown-pragmas -Wno-class-memaccess -Wno-multichar -Wno-deprecated-declarations -Wno-subobject-linkage -Wno-invalid-constexpr")
+    else()
+      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CXX_STANDARD} -fstrict-aliasing -Wno-unknown-pragmas -Wno-unused-function -Wno-deprecated-declarations")
+    endif()
     if (APPLE)
         set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-nullability-extension")
     endif()
@@ -364,11 +368,23 @@ 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 (${USE_STATIC_LIBCXX})
-        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
-        link_libraries("-static-libgcc -static-libstdc++")
-        link_libraries(libc++.a)
-        link_libraries(libc++abi.a)
+        if (FILAMENT_USING_GCC)
+            link_libraries("-static-libgcc -static-libstdc++")
+        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()
 
     # Only linux, clang doesn't want to use a shared library that is not PIC.
@@ -393,8 +409,8 @@ if (MSVC)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_CRT_SECURE_NO_WARNINGS -D_CRT_NONSTDC_NO_DEPRECATE")
 endif()
 
-# Add colors to ninja builds
-if (UNIX AND CMAKE_GENERATOR STREQUAL "Ninja")
+# Add colors to ninja builds (when not using gcc)
+if (UNIX AND CMAKE_GENERATOR STREQUAL "Ninja" AND NOT FILAMENT_USING_GCC)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fcolor-diagnostics")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fcolor-diagnostics")
 endif()
@@ -466,7 +482,7 @@ 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.
@@ -556,6 +572,10 @@ 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)
@@ -567,7 +587,7 @@ 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)
@@ -748,12 +768,61 @@ function(combine_static_libs TARGET OUTPUT DEPS)
 endfunction()
 
 # ==================================================================================================
-# Configuration for CMAKE_CROSSCOMPILING.
+# Configuration importing/exporting prebuilt "/tools" executables
 # ==================================================================================================
+
+# In certain cases, we want the ability to separate the build type/flags (release, debug) of tools
+# (matc, resgen, etc...) from filament.  Cross compilation is one such case (e.g. building material
+# with matc running on host while building filament for Android) [1]. Another example is when client
+# wants to enable ASAN for filament but not the tool [2].
+#
+# Here are the varibles that are used to determine behavior is such flows:
+#   - CMAKE_CROSSCOMPILING : Set by cmake to indicate the build's target platform is different
+#     from the host platform.
+#   - IMPORT_EXECUTABLES_DIR : This is the directory containing the /ImportExecutables-type.cmake
+#     which are then included in other CMakeLists.txt to enable finding targets that have been
+#     prebuilt. This is set by the client in their `cmake` invocation.
+#   - IMPORT_EXECUTABLES : Path to a file to for 1) exporting the prebuilt targets or 2)
+#     importing a previously exported targets. (Used internally and should not be set by client).
+#   - FILAMENT_EXPORT_PREBUILT_EXECUTABLES_DIR : A path set by the client to indicate that
+#     they wish to export the tools as prebuilts, and the corresponding targets will be recorded
+#     in a cmake file (i.e IMPORT_EXECUTABLES). IMPORT_EXECUTABLES will be set relative to the the
+#     given path. This will set FILAMENT_EXPORT_PREBUILT_EXECUTABLES=ON.
+#   - FILAMENT_IMPORT_PREBUILT_EXECUTABLES_DIR : A path set by the client to indicate that they wish
+#     to import the tools as prebuilts from a .cmake file. The location (IMPORT_EXECUTABLES) of the
+#     file is relative to the path given. This will set FILAMENT_IMPORT_PREBUILT_EXECUTABLES=ON.
+#   - IMPORT_PREBUILT_EXECUTABLES and EXPORT_PREBUILT_EXECUTABLES are internal booleans set to
+#     ON based on the prescence of FILAMENT_IMPORT_PREBUILT_EXECUTABLES_DIR and
+#     FILAMENT_EXPORT_PREBUILT_EXECUTABLES_DIR.
+#
+# In conclusion, for cases
+#   - [1] (crosscompiling), the client must set IMPORT_EXECUTABLES_DIR for both when they are building
+#     the tools and when they are building the target-platform filament.
+#   - [2] (all other instances), the client must set FILAMENT_EXPORT_PREBUILT_EXECUTABLES_DIR in
+#     the prebuilt exporting step, and set FILAMENT_IMPORT_PREBUILT_EXECUTABLES_DIR in the importing
+#     step.
+
+# TODO: Fold the cross compilation case into the more general FILAMENT_IMPORT/EXPORT variables.
+
+if (FILAMENT_EXPORT_PREBUILT_EXECUTABLES_DIR)
+   set(FILAMENT_EXPORT_PREBUILT_EXECUTABLES ON)
+   set(IMPORT_EXECUTABLES_DIR ${FILAMENT_EXPORT_PREBUILT_EXECUTABLES_DIR})
+endif()
+
+if (FILAMENT_IMPORT_PREBUILT_EXECUTABLES_DIR)
+   set(FILAMENT_IMPORT_PREBUILT_EXECUTABLES ON)
+   set(IMPORT_EXECUTABLES_DIR ${FILAMENT_IMPORT_PREBUILT_EXECUTABLES_DIR})
+endif()
+
 if (WEBGL)
     set(IMPORT_EXECUTABLES ${FILAMENT}/${IMPORT_EXECUTABLES_DIR}/ImportExecutables-Release.cmake)
 else()
-    set(IMPORT_EXECUTABLES ${FILAMENT}/${IMPORT_EXECUTABLES_DIR}/ImportExecutables-${CMAKE_BUILD_TYPE}.cmake)
+    if (FILAMENT_EXPORT_PREBUILT_EXECUTABLES OR FILAMENT_IMPORT_PREBUILT_EXECUTABLES)
+        set(IMPORT_EXECUTABLES_BUILD_TYPE Prebuilt)
+    else()
+        set(IMPORT_EXECUTABLES_BUILD_TYPE ${CMAKE_BUILD_TYPE})
+    endif()
+    set(IMPORT_EXECUTABLES ${FILAMENT}/${IMPORT_EXECUTABLES_DIR}/ImportExecutables-${IMPORT_EXECUTABLES_BUILD_TYPE}.cmake)
 endif()
 
 # ==================================================================================================
@@ -816,7 +885,9 @@ 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(${EXTERNAL}/robin-map/tnt)
@@ -830,7 +901,8 @@ add_subdirectory(${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)
+
 
 # Note that this has to be placed after mikktspace in order for combine_static_libs to work.
 add_subdirectory(${LIBRARIES}/geometry)
@@ -854,6 +926,10 @@ if (FILAMENT_ENABLE_FGVIEWER)
     add_subdirectory(${LIBRARIES}/fgviewer)
 endif()
 
+if (FILAMENT_SUPPORTS_WEBP_TEXTURES)
+    add_subdirectory(${EXTERNAL}/libwebp/tnt)
+endif()
+
 if (FILAMENT_SUPPORTS_VULKAN)
     add_subdirectory(${LIBRARIES}/bluevk)
     add_subdirectory(${EXTERNAL}/vkmemalloc/tnt)
@@ -909,9 +985,10 @@ if (IS_HOST_PLATFORM)
     add_subdirectory(${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)
-if (NOT CMAKE_CROSSCOMPILING)
+if ((NOT CMAKE_CROSSCOMPILING AND NOT FILAMENT_IMPORT_PREBUILT_EXECUTABLES) OR FILAMENT_EXPORT_PREBUILT_EXECUTABLES)
     export(TARGETS matc cmgen filamesh mipgen resgen uberz glslminifier FILE ${IMPORT_EXECUTABLES})
 endif()

README.md

@@ -31,7 +31,7 @@ repositories {
 }
 
 dependencies {
-    implementation 'com.google.android.filament:filament-android:1.66.0'
+    implementation 'com.google.android.filament:filament-android:1.68.5'
 }
 ```
 
@@ -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', '~> 1.66.0'
+pod 'Filament', '~> 1.68.5'
 ```
 
 ## Documentation

RELEASE_NOTES.md

@@ -7,6 +7,51 @@ 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).
 
+## v1.69.0
+
+- 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.
+- third_party: Optionally add libwebp to build
+  - controlled by cmake flag FILAMENT_SUPPORTS_WEBP_TEXTURES, defaults to OFF
+  - actual webp texture support for libs/gltfio coming in subsequent change
+
+## v1.67.0
+
+- materials: Add a new API getParameterTransformName that will return the value of the transformName field of a sampler
+parameter. [⚠️ **Recompile Materials**]
+
+## v1.66.2
+
+
 ## v1.66.1
 
 - filamat: Removed a dependency on Glslang's deprecated SPIR-V remapper.

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

@@ -51,10 +51,6 @@ add_library(bluevk STATIC IMPORTED)
 set_target_properties(bluevk PROPERTIES IMPORTED_LOCATION
         ${FILAMENT_DIR}/lib/${ANDROID_ABI}/libbluevk.a)
 
-add_library(vkshaders STATIC IMPORTED)
-set_target_properties(vkshaders PROPERTIES IMPORTED_LOCATION
-        ${FILAMENT_DIR}/lib/${ANDROID_ABI}/libvkshaders.a)
-
 if (FILAMENT_SUPPORTS_WEBGPU)
         add_library(webgpu_dawn STATIC IMPORTED)
         set_target_properties(webgpu_dawn PROPERTIES IMPORTED_LOCATION
@@ -138,6 +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.
@@ -165,10 +162,15 @@ target_link_libraries(filament-jni
     PRIVATE $<$<STREQUAL:${FILAMENT_ENABLE_MATDBG},ON>:matdbg>
     PRIVATE $<$<STREQUAL:${FILAMENT_ENABLE_MATDBG},ON>:filamat>
     PRIVATE $<$<STREQUAL:${FILAMENT_SUPPORTS_VULKAN},ON>:bluevk>
-    PRIVATE $<$<STREQUAL:${FILAMENT_SUPPORTS_VULKAN},ON>:vkshaders>
     PRIVATE $<$<STREQUAL:${FILAMENT_SUPPORTS_VULKAN},ON>:smol-v>
     PRIVATE $<$<STREQUAL:${FILAMENT_SUPPORTS_WEBGPU},ON>:webgpu_dawn>
 )
 
 # 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/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) {
@@ -557,7 +573,8 @@ extern "C" JNIEXPORT void JNICALL Java_com_google_android_filament_Engine_nSetBu
         jboolean disableHandleUseAfterFreeCheck,
         jint preferredShaderLanguage,
         jboolean forceGLES2Context, jboolean assertNativeWindowIsValid,
-        jint gpuContextPriority) {
+        jint gpuContextPriority,
+        jlong sharedUboInitialSizeInBytes) {
     Engine::Builder* builder = (Engine::Builder*) nativeBuilder;
     Engine::Config config = {
             .commandBufferSizeMB = (uint32_t) commandBufferSizeMB,
@@ -576,6 +593,7 @@ extern "C" JNIEXPORT void JNICALL Java_com_google_android_filament_Engine_nSetBu
             .forceGLES2Context = (bool) forceGLES2Context,
             .assertNativeWindowIsValid = (bool) assertNativeWindowIsValid,
             .gpuContextPriority = (Engine::GpuContextPriority) gpuContextPriority,
+            .sharedUboInitialSizeInBytes = (uint32_t) sharedUboInitialSizeInBytes,
     };
     builder->config(&config);
 }

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);
@@ -279,6 +280,17 @@ Java_com_google_android_filament_Material_nHasParameter(JNIEnv* env, jclass,
     return (jboolean) hasParameter;
 }
 
+extern "C" JNIEXPORT jstring JNICALL
+Java_com_google_android_filament_Material_nGetParameterTransformName(JNIEnv* env, jclass,
+        jlong nativeMaterial, jstring samplerName_) {
+    Material* material = (Material*) nativeMaterial;
+    const char* samplerName = env->GetStringUTFChars(samplerName_, 0);
+    const char* transformName = material->getParameterTransformName(samplerName);
+    jstring transformName_ = env->NewStringUTF(transformName ? transformName : "");
+    env->ReleaseStringUTFChars(samplerName_, samplerName);
+    return transformName_;
+}
+
 extern "C"
 JNIEXPORT void JNICALL
 Java_com_google_android_filament_Material_nCompile(JNIEnv *env, jclass clazz,

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/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>
@@ -388,6 +393,57 @@ 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 +663,4 @@ 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

@@ -147,6 +147,15 @@ Java_com_google_android_filament_View_nSetDynamicResolutionOptions(JNIEnv*, jcla
     view->setDynamicResolutionOptions(options);
 }
 
+extern "C" JNIEXPORT void JNICALL
+Java_com_google_android_filament_View_nGetLastDynamicResolutionScale(JNIEnv *env, jclass, jlong nativeView, jfloatArray out_) {
+    jfloat* out = env->GetFloatArrayElements(out_, nullptr);
+    View *view = (View *) nativeView;
+    math::float2 result = view->getLastDynamicResolutionScale();
+    std::copy_n(result.v, 2, out);
+    env->ReleaseFloatArrayElements(out_, out, 0);
+}
+
 extern "C" JNIEXPORT void JNICALL
 Java_com_google_android_filament_View_nSetShadowType(JNIEnv*, jclass, jlong nativeView, jint type) {
     View* view = (View*) nativeView;

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

@@ -99,6 +99,15 @@ final class Asserts {
         }
     }
 
+    @NonNull @Size(min = 2)
+    static float[] assertFloat2(@Nullable float[] out) {
+        if (out == null) out = new float[2];
+        else if (out.length < 2) {
+            throw new ArrayIndexOutOfBoundsException("Array length must be at least 2");
+        }
+        return out;
+    }
+
     @NonNull @Size(min = 4)
     static float[] assertFloat4(@Nullable float[] out) {
         if (out == null) out = new float[4];

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

@@ -264,7 +264,8 @@ public class Engine {
                     config.disableHandleUseAfterFreeCheck,
                     config.preferredShaderLanguage.ordinal(),
                     config.forceGLES2Context, config.assertNativeWindowIsValid,
-                    config.gpuContextPriority.ordinal());
+                    config.gpuContextPriority.ordinal(),
+                    config.sharedUboInitialSizeInBytes);
             return this;
         }
 
@@ -525,6 +526,16 @@ public class Engine {
          * GPU context priority level. Controls GPU work scheduling and preemption.
          */
         public GpuContextPriority gpuContextPriority = GpuContextPriority.DEFAULT;
+
+        /**
+         * The initial size in bytes of the shared uniform buffer used for material instance batching.
+         *
+         * If the buffer runs out of space during a frame, it will be automatically reallocated
+         * with a larger capacity. Setting an appropriate initial size can help avoid runtime
+         * reallocations, which can cause a minor performance stutter, at the cost of higher
+         * initial memory usage.
+         */
+        public long sharedUboInitialSizeInBytes = 256 * 64;
     }
 
     private Engine(long nativeEngine, Config config) {
@@ -928,6 +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
@@ -1181,6 +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
@@ -1472,6 +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);
@@ -1488,6 +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);
@@ -1529,7 +1560,8 @@ public class Engine {
             boolean disableHandleUseAfterFreeCheck,
             int preferredShaderLanguage,
             boolean forceGLES2Context, boolean assertNativeWindowIsValid,
-            int gpuContextPriority);
+            int gpuContextPriority,
+            long sharedUboInitialSizeInBytes);
     private static native void nSetBuilderFeatureLevel(long nativeBuilder, int ordinal);
     private static native void nSetBuilderSharedContext(long nativeBuilder, long sharedContext);
     private static native void nSetBuilderPaused(long nativeBuilder, boolean paused);

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

@@ -261,6 +261,20 @@ 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 +386,7 @@ public class Material {
         private int mSize;
         private int mShBandCount = 0;
         private ShadowSamplingQuality mShadowSamplingQuality = ShadowSamplingQuality.LOW;
+        private UboBatchingMode mUboBatchingMode = UboBatchingMode.DEFAULT;
 
 
         /**
@@ -416,6 +431,17 @@ 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 +454,7 @@ 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);
         }
@@ -787,6 +813,21 @@ public class Material {
         return nHasParameter(getNativeObject(), name);
     }
 
+    /**
+     * 
+     * Returns the name of the transform parameter associated with the given sampler parameter.
+     * In the case the parameter doesn't have a transform name field, it will return an empty string.
+     * 
+     * @param samplerName the name of the sampler parameter to query.
+     * 
+     * @see
+     * <a href="https://google.github.io/filament/Materials.html#materialdefinitions/materialblock/general:parameters">
+     * General: parameters</a>
+     */
+    public String getParameterTransformName(@NonNull String samplerName) {
+        return nGetParameterTransformName(getNativeObject(), samplerName);
+    }
+
     /**
      * Sets the value of a bool parameter on this material's default instance.
      *
@@ -1079,7 +1120,7 @@ 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);
@@ -1111,4 +1152,5 @@ public class Material {
     private static native int nGetRequiredAttributes(long nativeMaterial);
 
     private static native boolean nHasParameter(long nativeMaterial, @NonNull String name);
+    private static native String nGetParameterTransformName(long nativeMaterial, @NonNull String samplerName);
 }

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/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();
 
@@ -1172,6 +1182,38 @@ 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>.
      *
@@ -1364,6 +1406,8 @@ 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/TextureSampler.java

@@ -294,8 +294,8 @@ public class TextureSampler {
     /**
      * This controls anisotropic filtering.
      *
-     * @param anisotropy Amount of anisotropy, should be a power-of-two. The default is 0.
-     *                   The maximum permissible value is 7.
+     * @param anisotropy Amount of anisotropy, should be a power-of-two. The default is 1.
+     *                   The maximum permissible value is 128.
      */
     public void setAnisotropy(float anisotropy) {
         mSampler = nSetAnisotropy(mSampler, anisotropy);

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

@@ -25,7 +25,6 @@ import java.util.EnumSet;
 
 import static com.google.android.filament.Asserts.assertFloat3In;
 import static com.google.android.filament.Asserts.assertFloat4In;
-import static com.google.android.filament.Colors.LinearColor;
 
 import com.google.android.filament.proguard.UsedByNative;
 
@@ -674,6 +673,21 @@ public class View {
         return mDynamicResolution;
     }
 
+    /**
+     * Returns the last dynamic resolution scale factor used by this view. This value is updated
+     * when Renderer::render(View*) is called
+     * @param out A 2-float array where the value will be stored, or null in which case the array is
+     *            allocated.
+     * @return A 2-float array containing the horizontal and the vertical scale factors
+     * @see Renderer#render(View)
+     */
+    @NonNull @Size(min = 2)
+    public float[] getLastDynamicResolutionScale(@Nullable @Size(min = 2) float[] out) {
+        out = Asserts.assertFloat2(out);
+        nGetLastDynamicResolutionScale(getNativeObject(), out);
+        return out;
+    }
+
     /**
      * Sets the rendering quality for this view (e.g. color precision).
      *
@@ -1317,6 +1331,7 @@ public class View {
     private static native void nSetDithering(long nativeView, int dithering);
     private static native int nGetDithering(long nativeView);
     private static native void nSetDynamicResolutionOptions(long nativeView, boolean enabled, boolean homogeneousScaling, float minScale, float maxScale, float sharpness, int quality);
+    private static native void nGetLastDynamicResolutionScale(long nativeView, float[] out);
     private static native void nSetRenderQuality(long nativeView, int hdrColorBufferQuality);
     private static native void nSetDynamicLightingOptions(long nativeView, float zLightNear, float zLightFar);
     private static native void nSetShadowType(long nativeView, int type);
@@ -2026,10 +2041,6 @@ public class View {
              * use an AABB neighborhood
              */
             AABB,
-            /**
-             * use the variance of the neighborhood (not recommended)
-             */
-            VARIANCE,
             /**
              * use both AABB and variance
              */
@@ -2060,7 +2071,7 @@ public class View {
         }
 
         /**
-         * reconstruction filter width typically between 1 (sharper) and 2 (smoother)
+         * @deprecated has no effect.
          */
         public float filterWidth = 1.0f;
         /**
@@ -2080,9 +2091,9 @@ public class View {
          */
         public boolean enabled = false;
         /**
-         * 4x TAA upscaling. Disables Dynamic Resolution. [BETA]
+         * Upscaling factor. Disables Dynamic Resolution. [BETA]
          */
-        public boolean upscaling = false;
+        public float upscaling = 1.0f;
         /**
          * whether to filter the history buffer
          */
@@ -2095,6 +2106,10 @@ public class View {
          * whether to use the YcoCg color-space for history rejection
          */
         public boolean useYCoCg = false;
+        /**
+         * set to true for HDR content
+         */
+        public boolean hdr = true;
         /**
          * type of color gamut box
          */

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-aarch64',    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/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/filament-utils-android/src/main/java/com/google/android/filament/utils/TextureLoader.kt

@@ -40,7 +40,21 @@ fun loadTexture(engine: Engine, resources: Resources, resourceId: Int, type: Tex
     options.inPremultiplied = type == TextureType.COLOR
 
     val bitmap = BitmapFactory.decodeResource(resources, resourceId, options)
+    return buildTexture(engine, bitmap, type)
+}
 
+fun loadTexture(engine: Engine, bytes: ByteArray, type: TextureType, offset: Int = 0, length: Int = bytes.size): Texture {
+    val options = BitmapFactory.Options()
+    // Color is the only type of texture we want to pre-multiply with the alpha channel
+    // Pre-multiplication is the default behavior, so we need to turn it off here
+    options.inPremultiplied = type == TextureType.COLOR
+
+    val bitmap = BitmapFactory.decodeByteArray(bytes, offset, length, options)
+    return buildTexture(engine, bitmap, type)
+}
+
+
+private fun buildTexture(engine: Engine, bitmap: Bitmap, type: TextureType): Texture {
     val texture = Texture.Builder()
             .width(bitmap.width)
             .height(bitmap.height)

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

@@ -22,6 +22,7 @@ object Utils {
     /**
      * Initializes the utils JNI layer. Must be called before using any utils functionality.
      */
+    @JvmStatic
     fun init() {
         // Load Filament first to ensure that the NioUtils Java class is available in the JNIEnv.
         Filament.init()

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=1.66.0
+VERSION_NAME=1.68.5
 
 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/build.gradle

@@ -17,12 +17,20 @@ filamentTools {
 }
 
 // don't forget to update MainACtivity.kt when/if changing this.
-tasks.register('copyMesh', Copy) {
+tasks.register('copyDamagedHelmetGltf', Copy) {
+    from file("../../../third_party/models/DamagedHelmet/DamagedHelmet.glb")
+    into file("src/main/assets/models")
+    rename {String fileName -> "helmet.glb"}
+}
+
+// don't forget to update MainACtivity.kt when/if changing this.
+tasks.register('copyBusterGltf', Copy) {
     from "../../../third_party/models/BusterDrone"
     into "src/main/assets/models"
 }
 
-preBuild.dependsOn copyMesh
+preBuild.dependsOn copyDamagedHelmetGltf
+preBuild.dependsOn copyBusterGltf
 
 clean.doFirst {
     delete "src/main/assets"

android/samples/sample-material-instance-stress/.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-material-instance-stress/build.gradle

@@ -0,0 +1,52 @@
+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.materialinstancestress'
+
+    compileSdkVersion versions.compileSdk
+    defaultConfig {
+        applicationId "com.google.android.filament.materialinstancestress"
+        minSdkVersion versions.minSdk
+        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-material-instance-stress/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-material-instance-stress/src/main/java/com/google/android/filament/materialinstancestress/MainActivity.kt

@@ -0,0 +1,532 @@
+/*
+ * Copyright (C) 2025 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.materialinstancestress
+
+import android.animation.ValueAnimator
+import android.app.Activity
+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.*
+import com.google.android.filament.VertexBuffer.*
+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.cos
+import kotlin.math.sin
+
+class MainActivity : Activity() {
+    // Make sure to initialize Filament first
+    // This loads the JNI library needed by most API calls
+    companion object {
+        init {
+            Filament.init()
+        }
+
+        private const val NUM_CUBES = 1000
+        private const val GRID_SIZE = 10
+        private const val SPACING = 2.5f
+    }
+
+    // The View we want to render into
+    private lateinit var surfaceView: SurfaceView
+    // UiHelper is provided by Filament to manage SurfaceView and SurfaceTexture
+    private lateinit var uiHelper: UiHelper
+    // DisplayHelper is provided by Filament to manage the display
+    private lateinit var displayHelper: DisplayHelper
+    // Choreographer is used to schedule new frames
+    private lateinit var choreographer: Choreographer
+
+    // Engine creates and destroys Filament resources
+    // Each engine must be accessed from a single thread of your choosing
+    // Resources cannot be shared across engines
+    private lateinit var engine: Engine
+    // A renderer instance is tied to a single surface (SurfaceView, TextureView, etc.)
+    private lateinit var renderer: Renderer
+    // A scene holds all the renderable, lights, etc. to be drawn
+    private lateinit var scene: Scene
+    // A view defines a viewport, a scene and a camera for rendering
+    private lateinit var view: View
+    // Should be pretty obvious :)
+    private lateinit var camera: Camera
+
+    private lateinit var material: Material
+    private lateinit var vertexBuffer: VertexBuffer
+    private lateinit var indexBuffer: IndexBuffer
+
+    // Filament entity representing a renderable object
+    @Entity private val renderables = IntArray(NUM_CUBES)
+    private val materialInstances = arrayOfNulls<MaterialInstance>(NUM_CUBES)
+    private val translationMatrices = Array(NUM_CUBES) { FloatArray(16) }
+
+    @Entity private var light = 0
+
+    // A swap chain is Filament's representation of a surface
+    private var swapChain: SwapChain? = null
+
+    private var cameraRadius = 42.7f // Initial distance (calculated from original 15Y, 40Z)
+    private var cameraTheta = 0.0f  // Azimuth (horizontal) in radians
+    private var cameraPhi = 0.358f  // Elevation (vertical) in radians (from original 15Y, 40Z)
+
+    private var mLastX = 0.0f
+    private var mLastY = 0.0f
+    private val DRAG_SPEED = 0.005f
+
+    // Performs the rendering and schedules new frames
+    private val frameScheduler = FrameCallback()
+
+    private val animator = ValueAnimator.ofFloat(0.0f, 360.0f)
+
+    private val animatorListener = object : ValueAnimator.AnimatorUpdateListener {
+        // Pre-allocate matrix to avoid GC churn
+        private val transformMatrix = FloatArray(16)
+
+        override fun onAnimationUpdate(a: ValueAnimator) {
+            val tcm = engine.transformManager
+            val time = a.animatedFraction // 0.0 to 1.0
+
+            // Calculate the sine wave scale factor.
+            // sin(time * 2 * PI) oscillates between -1.0 and 1.0.
+            // We multiply by 0.5f (so it's -0.5 to 0.5) and add 1.0f.
+            // This makes the final 'scale' oscillate between 0.5 and 1.5.
+            val scale = 1.0f + sin(time * 2.0 * Math.PI).toFloat() * 0.5f
+
+            val localScale = (scale - 0.5f) * 0.5f + 0.5f
+
+            for (i in 0 until NUM_CUBES) {
+                val inst = tcm.getInstance(renderables[i])
+                val materialInst = materialInstances[i] ?: continue
+
+                // Get the cube's base position from its stored matrix
+                // The translation is in elements 12 (x), 13 (y), and 14 (z)
+                val baseX = translationMatrices[i][12]
+                val baseY = translationMatrices[i][13]
+                val baseZ = translationMatrices[i][14]
+
+                // Set the transformMatrix to a new translation matrix,
+                // scaled from the center (0,0,0)
+                Matrix.setIdentityM(transformMatrix, 0)
+                Matrix.translateM(transformMatrix, 0,
+                        baseX * scale,
+                        baseY * scale,
+                        baseZ * scale)
+                Matrix.scaleM(transformMatrix, 0, localScale, localScale, localScale)
+
+                tcm.setTransform(inst, transformMatrix)
+
+                // Vary roughness
+                val roughness = 0.5f + 0.5f * sin(time * 2.0 * Math.PI + i * 0.1).toFloat()
+                materialInst.setParameter("roughness", roughness)
+
+                // Vary color (using linear RGB)
+                val r = 0.5f + 0.5f * cos(time * 2.0 * Math.PI + i * 0.5).toFloat()
+                val g = 0.5f + 0.5f * sin(time * 2.0 * Math.PI + i * 0.3).toFloat()
+                val b = 0.5f + 0.5f * cos(time * 2.0 * Math.PI + i * 0.1).toFloat()
+                materialInst.setParameter("baseColor", Colors.RgbType.LINEAR, r, g, b)
+            }
+        }
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        surfaceView = SurfaceView(this)
+        setContentView(surfaceView)
+
+        surfaceView.setOnTouchListener(touchListener)
+        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())
+    }
+
+    private fun setupView() {
+        scene.skybox = Skybox.Builder().color(0.035f, 0.035f, 0.035f, 1.0f).build(engine)
+        view.camera = camera
+        view.scene = scene
+    }
+
+    private fun setupScene() {
+        loadMaterial()
+        createMesh()
+
+        val tcm = engine.transformManager
+        val center = (GRID_SIZE - 1) * 0.5f
+
+        for (i in 0 until NUM_CUBES) {
+            // Calculate grid position
+            val x = (i % GRID_SIZE) - center
+            val y = ((i / GRID_SIZE) % GRID_SIZE) - center
+            val z = (i / (GRID_SIZE * GRID_SIZE)) - center
+
+            val posX = x * SPACING
+            val posY = y * SPACING
+            val posZ = z * SPACING
+
+            // Create material instance for this cube
+            materialInstances[i] = material.createInstance()
+
+            // Set initial parameters (will be overwritten by animator, but good practice)
+            materialInstances[i]?.setParameter("baseColor", Colors.RgbType.SRGB, 1.0f, 0.85f, 0.57f)
+            materialInstances[i]?.setParameter("metallic", 0.0f)
+            materialInstances[i]?.setParameter("roughness", 0.3f)
+
+            // Create the renderable entity
+            renderables[i] = EntityManager.get().create()
+
+            // Create the renderable component
+            RenderableManager.Builder(1)
+                .boundingBox(Box(0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f))
+                .geometry(0, PrimitiveType.TRIANGLES, vertexBuffer, indexBuffer, 0, 6 * 6)
+                .material(0, materialInstances[i]!!)
+                .build(engine, renderables[i])
+
+            // Add to scene
+            scene.addEntity(renderables[i])
+
+            // Set its initial transform
+            // Store the base translation matrix
+            Matrix.setIdentityM(translationMatrices[i], 0)
+            Matrix.translateM(translationMatrices[i], 0, posX, posY, posZ)
+
+            // Get the transform component instance
+            val inst = tcm.getInstance(renderables[i])
+            tcm.setTransform(inst, translationMatrices[i])
+        }
+
+        // We now need a light, let's create a directional light
+        light = EntityManager.get().create()
+
+        val (r, g, b) = Colors.cct(5_500.0f)
+        LightManager.Builder(LightManager.Type.DIRECTIONAL)
+                .color(r, g, b)
+                .intensity(110_000.0f)
+                .direction(0.0f, -0.5f, -1.0f)
+                .castShadows(true)
+                .build(engine, light)
+
+        scene.addEntity(light)
+
+        camera.setExposure(16.0f, 1.0f / 125.0f, 100.0f)
+
+        updateCamera()
+
+        startAnimation()
+    }
+
+    private fun loadMaterial() {
+        readUncompressedAsset("materials/lit.filamat").let {
+            material = Material.Builder().payload(it, it.remaining()).build(engine)
+        }
+    }
+
+    private fun createMesh() {
+        val floatSize = 4
+        val shortSize = 2
+        val vertexSize = 3 * floatSize + 4 * floatSize
+
+        // A vertex is a position + a tangent frame:
+        // 3 floats for XYZ position, 4 floats for normal+tangents (quaternion)
+        @Suppress("ArrayInDataClass")
+        data class Vertex(val x: Float, val y: Float, val z: Float, val tangents: FloatArray)
+        fun ByteBuffer.put(v: Vertex): ByteBuffer {
+            putFloat(v.x)
+            putFloat(v.y)
+            putFloat(v.z)
+            v.tangents.forEach { putFloat(it) }
+            return this
+        }
+
+        // 6 faces, 4 vertices per face
+        val vertexCount = 6 * 4
+
+        // Create tangent frames, one per face
+        val tfPX = FloatArray(4)
+        val tfNX = FloatArray(4)
+        val tfPY = FloatArray(4)
+        val tfNY = FloatArray(4)
+        val tfPZ = FloatArray(4)
+        val tfNZ = FloatArray(4)
+
+        MathUtils.packTangentFrame( 0.0f,  1.0f, 0.0f, 0.0f, 0.0f, -1.0f,  1.0f,  0.0f,  0.0f, tfPX)
+        MathUtils.packTangentFrame( 0.0f,  1.0f, 0.0f, 0.0f, 0.0f, -1.0f, -1.0f,  0.0f,  0.0f, tfNX)
+        MathUtils.packTangentFrame(-1.0f,  0.0f, 0.0f, 0.0f, 0.0f, -1.0f,  0.0f,  1.0f,  0.0f, tfPY)
+        MathUtils.packTangentFrame(-1.0f,  0.0f, 0.0f, 0.0f, 0.0f,  1.0f,  0.0f, -1.0f,  0.0f, tfNY)
+        MathUtils.packTangentFrame( 0.0f,  1.0f, 0.0f, 1.0f, 0.0f,  0.0f,  0.0f,  0.0f,  1.0f, tfPZ)
+        MathUtils.packTangentFrame( 0.0f, -1.0f, 0.0f, 1.0f, 0.0f,  0.0f,  0.0f,  0.0f, -1.0f, tfNZ)
+
+        val vertexData = ByteBuffer.allocate(vertexCount * vertexSize)
+                // It is important to respect the native byte order
+                .order(ByteOrder.nativeOrder())
+                // Face -Z
+                .put(Vertex(-1.0f, -1.0f, -1.0f, tfNZ))
+                .put(Vertex(-1.0f,  1.0f, -1.0f, tfNZ))
+                .put(Vertex( 1.0f,  1.0f, -1.0f, tfNZ))
+                .put(Vertex( 1.0f, -1.0f, -1.0f, tfNZ))
+                // Face +X
+                .put(Vertex( 1.0f, -1.0f, -1.0f, tfPX))
+                .put(Vertex( 1.0f,  1.0f, -1.0f, tfPX))
+                .put(Vertex( 1.0f,  1.0f,  1.0f, tfPX))
+                .put(Vertex( 1.0f, -1.0f,  1.0f, tfPX))
+                // Face +Z
+                .put(Vertex(-1.0f, -1.0f,  1.0f, tfPZ))
+                .put(Vertex( 1.0f, -1.0f,  1.0f, tfPZ))
+                .put(Vertex( 1.0f,  1.0f,  1.0f, tfPZ))
+                .put(Vertex(-1.0f,  1.0f,  1.0f, tfPZ))
+                // Face -X
+                .put(Vertex(-1.0f, -1.0f,  1.0f, tfNX))
+                .put(Vertex(-1.0f,  1.0f,  1.0f, tfNX))
+                .put(Vertex(-1.0f,  1.0f, -1.0f, tfNX))
+                .put(Vertex(-1.0f, -1.0f, -1.0f, tfNX))
+                // Face -Y
+                .put(Vertex(-1.0f, -1.0f,  1.0f, tfNY))
+                .put(Vertex(-1.0f, -1.0f, -1.0f, tfNY))
+                .put(Vertex( 1.0f, -1.0f, -1.0f, tfNY))
+                .put(Vertex( 1.0f, -1.0f,  1.0f, tfNY))
+                // Face +Y
+                .put(Vertex(-1.0f,  1.0f, -1.0f, tfPY))
+                .put(Vertex(-1.0f,  1.0f,  1.0f, tfPY))
+                .put(Vertex( 1.0f,  1.0f,  1.0f, tfPY))
+                .put(Vertex( 1.0f,  1.0f, -1.0f, tfPY))
+                // Make sure the cursor is pointing in the right place in the byte buffer
+                .flip()
+
+        // Declare the layout of our mesh
+        vertexBuffer = VertexBuffer.Builder()
+                .bufferCount(1)
+                .vertexCount(vertexCount)
+                // Because we interleave position and color data we must specify offset and stride
+                // We could use de-interleaved data by declaring two buffers and giving each
+                // attribute a different buffer index
+                .attribute(VertexAttribute.POSITION, 0, AttributeType.FLOAT3, 0,             vertexSize)
+                .attribute(VertexAttribute.TANGENTS, 0, AttributeType.FLOAT4, 3 * floatSize, vertexSize)
+                .build(engine)
+
+        // Feed the vertex data to the mesh
+        // We only set 1 buffer because the data is interleaved
+        vertexBuffer.setBufferAt(engine, 0, vertexData)
+
+        // Create the indices
+        val indexData = ByteBuffer.allocate(6 * 2 * 3 * shortSize)
+                .order(ByteOrder.nativeOrder())
+        repeat(6) {
+            val i = (it * 4).toShort()
+            indexData
+                    .putShort(i).putShort((i + 1).toShort()).putShort((i + 2).toShort())
+                    .putShort(i).putShort((i + 2).toShort()).putShort((i + 3).toShort())
+        }
+        indexData.flip()
+
+        // 6 faces, 2 triangles per face,
+        indexBuffer = IndexBuffer.Builder()
+                .indexCount(vertexCount * 2)
+                .bufferType(IndexBuffer.Builder.IndexType.USHORT)
+                .build(engine)
+        indexBuffer.setBuffer(engine, indexData)
+    }
+
+    private fun updateCamera() {
+        // Calculate eye position from spherical coordinates
+        val eyeY = cameraRadius * sin(cameraPhi)
+        val horizontalRadius = cameraRadius * cos(cameraPhi)
+        val eyeX = horizontalRadius * sin(cameraTheta)
+        val eyeZ = horizontalRadius * cos(cameraTheta)
+
+        // Point the camera at the center (0,0,0)
+        camera.lookAt(eyeX.toDouble(), eyeY.toDouble(), eyeZ.toDouble(), // eye
+                0.0, 0.0, 0.0, // center
+                0.0, 1.0, 0.0) // up
+    }
+
+    private val touchListener = object : android.view.View.OnTouchListener {
+        override fun onTouch(v: android.view.View?, event: android.view.MotionEvent?): Boolean {
+            if (event == null) return false
+            when (event.action) {
+                android.view.MotionEvent.ACTION_DOWN -> {
+                    mLastX = event.x
+                    mLastY = event.y
+                    return true
+                }
+                android.view.MotionEvent.ACTION_MOVE -> {
+                    val dx = event.x - mLastX
+                    val dy = event.y - mLastY
+
+                    cameraTheta -= dx * DRAG_SPEED
+                    cameraPhi += dy * DRAG_SPEED
+
+                    // Clamp vertical angle to avoid flipping over
+                    cameraPhi = cameraPhi.coerceIn(-1.5f, 1.5f)
+
+                    updateCamera()
+
+                    mLastX = event.x
+                    mLastY = event.y
+                    return true
+                }
+            }
+            return v?.onTouchEvent(event) ?: false
+        }
+    }
+
+    private fun startAnimation() {
+        animator.interpolator = LinearInterpolator()
+        animator.duration = 6000
+        animator.repeatMode = ValueAnimator.RESTART
+        animator.repeatCount = ValueAnimator.INFINITE
+        animator.addUpdateListener(animatorListener)
+        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()
+
+        // Stop the animation and any pending frame
+        choreographer.removeFrameCallback(frameScheduler)
+        animator.cancel();
+
+        // Always detach the surface before destroying the engine
+        uiHelper.detach()
+
+        // Cleanup all resources
+        engine.destroyEntity(light)
+
+        // Destroy all 1000 entities and material instances
+        for (i in 0 until NUM_CUBES) {
+            engine.destroyEntity(renderables[i])
+            materialInstances[i]?.let { engine.destroyMaterialInstance(it) }
+        }
+
+        engine.destroyRenderer(renderer)
+        engine.destroyVertexBuffer(vertexBuffer)
+        engine.destroyIndexBuffer(indexBuffer)
+        engine.destroyMaterial(material)
+        engine.destroyView(view)
+        engine.destroyScene(scene)
+        engine.destroyCameraComponent(camera.entity)
+
+        // Engine.destroyEntity() destroys Filament related resources only
+        // (components), not the entity itself
+        val entityManager = EntityManager.get()
+        entityManager.destroy(light)
+        for (entity in renderables) {
+            entityManager.destroy(entity)
+        }
+        entityManager.destroy(camera.entity)
+
+        // Destroying the engine will free up any resource you may have forgotten
+        // to destroy, but it's recommended to do the cleanup properly
+        engine.destroy()
+    }
+
+    inner class FrameCallback : Choreographer.FrameCallback {
+        override fun doFrame(frameTimeNanos: Long) {
+            // Schedule the next frame
+            choreographer.postFrameCallback(this)
+
+            // This check guarantees that we have a swap chain
+            if (uiHelper.isReadyToRender) {
+                // If beginFrame() returns false you should skip the frame
+                // This means you are sending frames too quickly to the GPU
+                if (renderer.beginFrame(swapChain!!, frameTimeNanos)) {
+                    renderer.render(view)
+                    renderer.endFrame()
+                }
+            }
+        }
+    }
+
+    inner class SurfaceCallback : UiHelper.RendererCallback {
+        override fun onNativeWindowChanged(surface: Surface) {
+            swapChain?.let { engine.destroySwapChain(it) }
+            swapChain = engine.createSwapChain(surface)
+            displayHelper.attach(renderer, surfaceView.display)
+        }
+
+        override fun onDetachedFromSurface() {
+            displayHelper.detach()
+            swapChain?.let {
+                engine.destroySwapChain(it)
+                // Required to ensure we don't return before Filament is done executing the
+                // destroySwapChain command, otherwise Android might destroy the Surface
+                // too early
+                engine.flushAndWait()
+                swapChain = null
+            }
+        }
+
+        override fun onResized(width: Int, height: Int) {
+            val aspect = width.toDouble() / height.toDouble()
+            camera.setProjection(45.0, aspect, 0.1, 100.0, Camera.Fov.VERTICAL)
+
+            view.viewport = Viewport(0, 0, width, height)
+
+            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-material-instance-stress/src/main/materials/lit.mat

@@ -0,0 +1,53 @@
+// Simple lit material that defines 3 parameters:
+// - baseColor
+// - roughness
+// - metallic
+//
+// These parameters can be used by the application to change the appearance of the material.
+//
+// This source material must be compiled to a binary material using the matc tool.
+// The command used to compile this material is:
+// matc -p mobile -a opengl -o app/src/main/assets/lit.filamat app/src/materials/lit.mat
+//
+// See build.gradle for an example of how to compile materials automatically
+// Please refer to the documentation for more information about matc and the materials system.
+
+material {
+    name : lit,
+
+    // Dynamic lighting is enabled on this material
+    shadingModel : lit,
+
+    // We don't need to declare a "requires" array, lit materials
+    // always requires the "tangents" vertex attribute (the normal
+    // is required for lighting, tangent/bitangent for normal mapping
+    // and anisotropy)
+
+    // List of parameters exposed by this material
+    parameters : [
+        // The color must be passed in linear space, not sRGB
+        {
+            type : float3,
+            name : baseColor
+        },
+        {
+            type : float,
+            name : roughness
+        },
+        {
+            type : float,
+            name : metallic
+        }
+    ],
+}
+
+fragment {
+    void material(inout MaterialInputs material) {
+        prepareMaterial(material);
+
+        // Nothing fancy here, we simply copy the parameters
+        material.baseColor.rgb = materialParams.baseColor;
+        material.roughness = materialParams.roughness;
+        material.metallic = materialParams.metallic;
+    }
+}

android/samples/sample-material-instance-stress/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-material-instance-stress/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-material-instance-stress/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-material-instance-stress/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-material-instance-stress/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-material-instance-stress/src/main/res/values/strings.xml

@@ -0,0 +1,3 @@
+<resources>
+  <string name="app_name">Material Instance Stress</string>
+</resources>

android/samples/sample-material-instance-stress/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/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'
@@ -12,10 +13,12 @@ include ':samples:sample-image-based-lighting'
 include ':samples:sample-lit-cube'
 include ':samples:sample-live-wallpaper'
 include ':samples:sample-material-builder'
+include ':samples:sample-material-instance-stress'
 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'
 

build.sh

@@ -77,6 +77,10 @@ function print_help {
     echo "        meant for building the samples."
     echo "    -P"
     echo "        Enable perfetto traces on Android. Disabled by default on the Release build, enabled otherwise."
+    echo "    -y build_type"
+    echo "        Build the filament dependent tools (matc, resgen) separately from the project. This will set"
+    echo "        the tools as prebuilts that filament target will then use to build. The built_type option"
+    echo "        (debug|release) is meant to indicate the type of build of the resulting prebuilts."
     echo ""
     echo "Build types:"
     echo "    release"
@@ -154,7 +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
@@ -217,6 +221,11 @@ OSMESA_OPTION=""
 IOS_BUILD_SIMULATOR=false
 BUILD_UNIVERSAL_LIBRARIES=false
 
+ISSUE_SPLIT_BUILD=false
+SPLIT_BUILD_TYPE=""
+PREBUILT_TOOLS_DIR=""
+IMPORT_EXECUTABLES_DIR_OPTION="-DIMPORT_EXECUTABLES_DIR=out"
+
 BUILD_GENERATOR=Ninja
 BUILD_COMMAND=ninja
 BUILD_CUSTOM_TARGETS=
@@ -242,6 +251,37 @@ function build_clean_aggressive {
     git clean -qfX android
 }
 
+function build_tools_for_split_build {
+    local build_type_arg=$1
+    local lc_build_type=$(echo "${build_type_arg}" | tr '[:upper:]' '[:lower:]')
+    PREBUILT_TOOLS_DIR="out/prebuilt-tools-${lc_build_type}"
+
+    echo "Building tools for split build (${lc_build_type}) in ${PREBUILT_TOOLS_DIR}..."
+    mkdir -p "${PREBUILT_TOOLS_DIR}"
+
+    pushd "${PREBUILT_TOOLS_DIR}" > /dev/null
+
+    local lc_name=$(echo "${UNAME}" | tr '[:upper:]' '[:lower:]')
+    local architectures=""
+    if [[ "${lc_name}" == "darwin" ]]; then
+        if [[ "${BUILD_UNIVERSAL_LIBRARIES}" == "true" ]]; then
+            architectures="-DCMAKE_OSX_ARCHITECTURES=arm64;x86_64"
+        fi
+    fi
+
+    cmake \
+        -G "${BUILD_GENERATOR}" \
+        -DFILAMENT_EXPORT_PREBUILT_EXECUTABLES_DIR=${PREBUILT_TOOLS_DIR} \
+        -DCMAKE_BUILD_TYPE="${build_type_arg}" \
+        ${WEBGPU_OPTION} \
+        ${architectures} \
+        ../..
+
+    ${BUILD_COMMAND} ${WEB_HOST_TOOLS}
+
+    popd > /dev/null
+}
+
 function build_desktop_target {
     local lc_target=$(echo "$1" | tr '[:upper:]' '[:lower:]')
     local build_targets=$2
@@ -265,7 +305,7 @@ function build_desktop_target {
     if [[ ! -d "CMakeFiles" ]] || [[ "${ISSUE_CMAKE_ALWAYS}" == "true" ]]; then
         cmake \
             -G "${BUILD_GENERATOR}" \
-            -DIMPORT_EXECUTABLES_DIR=out \
+            ${IMPORT_EXECUTABLES_DIR_OPTION} \
             -DCMAKE_BUILD_TYPE="$1" \
             -DCMAKE_INSTALL_PREFIX="../${lc_target}/filament" \
             ${EGL_ON_LINUX_OPTION} \
@@ -331,7 +371,7 @@ function build_webgl_with_target {
         source "${EMSDK}/emsdk_env.sh"
         cmake \
             -G "${BUILD_GENERATOR}" \
-            -DIMPORT_EXECUTABLES_DIR=out \
+            ${IMPORT_EXECUTABLES_DIR_OPTION} \
             -DCMAKE_TOOLCHAIN_FILE="${EMSDK}/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake" \
             -DCMAKE_BUILD_TYPE="$1" \
             -DCMAKE_INSTALL_PREFIX="../webgl-${lc_target}/filament" \
@@ -404,7 +444,7 @@ function build_android_target {
     if [[ ! -d "CMakeFiles" ]] || [[ "${ISSUE_CMAKE_ALWAYS}" == "true" ]]; then
         cmake \
             -G "${BUILD_GENERATOR}" \
-            -DIMPORT_EXECUTABLES_DIR=out \
+            ${IMPORT_EXECUTABLES_DIR_OPTION} \
             -DCMAKE_BUILD_TYPE="$1" \
             -DFILAMENT_NDK_VERSION="${FILAMENT_NDK_VERSION}" \
             -DCMAKE_INSTALL_PREFIX="../android-${lc_target}/filament" \
@@ -516,11 +556,14 @@ 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} \
@@ -533,6 +576,7 @@ 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
@@ -541,6 +585,7 @@ 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
@@ -573,6 +618,7 @@ 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} \
@@ -585,6 +631,7 @@ 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
@@ -593,6 +640,7 @@ 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
@@ -638,7 +686,7 @@ function build_ios_target {
     if [[ ! -d "CMakeFiles" ]] || [[ "${ISSUE_CMAKE_ALWAYS}" == "true" ]]; then
         cmake \
             -G "${BUILD_GENERATOR}" \
-            -DIMPORT_EXECUTABLES_DIR=out \
+            ${IMPORT_EXECUTABLES_DIR_OPTION} \
             -DCMAKE_BUILD_TYPE="$1" \
             -DCMAKE_INSTALL_PREFIX="../ios-${lc_target}/filament" \
             -DIOS_ARCH="${arch}" \
@@ -810,7 +858,7 @@ function check_debug_release_build {
 
 pushd "$(dirname "$0")" > /dev/null
 
-while getopts ":hacCfgimp:q:uvWslwedtk:bVx:S:X:P" opt; do
+while getopts ":hacCfgimp:q:uvWslwedtk:bVx:S:X:Py:" opt; do
     case ${opt} in
         h)
             print_help
@@ -979,6 +1027,20 @@ while getopts ":hacCfgimp:q:uvWslwedtk:bVx:S:X:P" opt; do
             ;;
         X)  OSMESA_OPTION="-DFILAMENT_OSMESA_PATH=${OPTARG}"
             ;;
+        y)
+            ISSUE_SPLIT_BUILD=true
+            SPLIT_BUILD_TYPE=${OPTARG}
+            case $(echo "${SPLIT_BUILD_TYPE}" | tr '[:upper:]' '[:lower:]') in
+                debug|release)
+                    ;;
+                *)
+                    echo "Unknown build type for -y: ${SPLIT_BUILD_TYPE}"
+                    echo "Build type must be one of [debug|release]"
+                    echo ""
+                    exit 1
+                    ;;
+            esac
+            ;;
         \?)
             echo "Invalid option: -${OPTARG}" >&2
             echo ""
@@ -1013,6 +1075,13 @@ done
 
 validate_build_command
 
+if [[ "${ISSUE_SPLIT_BUILD}" == "true" ]]; then
+    # Capitalize first letter of SPLIT_BUILD_TYPE
+    SPLIT_BUILD_TYPE_CAPITALIZED="$(echo ${SPLIT_BUILD_TYPE:0:1} | tr '[:lower:]' '[:upper:]')${SPLIT_BUILD_TYPE:1}"
+    build_tools_for_split_build "${SPLIT_BUILD_TYPE_CAPITALIZED}"
+    IMPORT_EXECUTABLES_DIR_OPTION="-DFILAMENT_IMPORT_PREBUILT_EXECUTABLES_DIR=${PREBUILT_TOOLS_DIR}"
+fi
+
 if [[ "${ISSUE_CLEAN}" == "true" ]]; then
     build_clean
 fi

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")