metal: adjust language preference

In the case of unspecified language preference, we should return MSL first as oppse metal lib.
2025-11-01 16:39:02 -07:00
1035 changed files with 21632 additions and 190305 deletions
@@ -21,9 +21,8 @@ jobs:
      - name: Run update script
        env:
          GH_TOKEN: ${{ secrets.FILAMENTBOT_TOKEN }}
-          COMMIT_MESSAGE: ${{ steps.get_commit_msg.outputs.msg }}
        run: |
-          GOLDEN_BRANCH=$(echo "${COMMIT_MESSAGE}" | python3 test/renderdiff/src/commit_msg.py)
+          GOLDEN_BRANCH=$(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"
@@ -134,17 +134,18 @@ jobs:
        env:
          COMMIT_MESSAGE: ${{ steps.get_commit_msg.outputs.msg }}
        run: |
+          ls ./gltf/Models
          TEST_DIR=test/renderdiff
          source ${TEST_DIR}/src/preamble.sh
-          set -eux
+          start_
          GOLDEN_BRANCH=$(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 -eux`
-          set +eux
+          # Note that we need to upload the output even if comparison fails, so we undo `set -ex`
+          end_

          python3 ${TEST_DIR}/src/compare.py \
              --src=${GOLDEN_OUTPUT_DIR} \
@@ -157,7 +158,6 @@ 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 gltf_viewer
+        run: ./build.sh -W debug test_filamat filament
      - name: Run test
        run: ./out/cmake-debug/libs/filamat/test_filamat --gtest_filter=MaterialCompiler.Wgsl*

@@ -203,23 +203,3 @@ 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
@@ -62,11 +62,6 @@ 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`.

-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:
@@ -56,10 +56,6 @@ 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)
@@ -299,10 +295,15 @@ set(TOOLS ${CMAKE_CURRENT_SOURCE_DIR}/tools)
 # ==================================================================================================
 set(MIN_CLANG_VERSION "6.0")

-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_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")
    if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS MIN_CLANG_VERSION)
        message(FATAL_ERROR "Detected CXX compiler Clang ${CMAKE_CXX_COMPILER_VERSION} < ${MIN_CLANG_VERSION}")
    endif()
@@ -343,11 +344,7 @@ if (MSVC)
    set(CXX_STANDARD "/std:c++latest")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CXX_STANDARD} /W0 /Zc:__cplusplus")
 else()
-    if(FILAMENT_USING_GCC)
-      set(CMAKE_CXX_FLAGS "${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} ${CXX_STANDARD} -fstrict-aliasing -Wno-unknown-pragmas -Wno-unused-function -Wno-deprecated-declarations")
-    endif()
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CXX_STANDARD} -fstrict-aliasing -Wno-unknown-pragmas -Wno-unused-function -Wno-deprecated-declarations")
    if (APPLE)
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-nullability-extension")
    endif()
@@ -368,14 +365,10 @@ endif()
 if (LINUX)
    option(USE_STATIC_LIBCXX "Link against the static runtime libraries." ON)
    if (${USE_STATIC_LIBCXX})
-        if (FILAMENT_USING_GCC)
-            link_libraries("-static-libgcc -static-libstdc++")
-        else ()
-            set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
-            link_libraries("-static-libgcc -static-libstdc++")
-            link_libraries(libc++.a)
-            link_libraries(libc++abi.a)
-        endif()
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
+        link_libraries("-static-libgcc -static-libstdc++")
+        link_libraries(libc++.a)
+        link_libraries(libc++abi.a)
    endif()

    # Only linux, clang doesn't want to use a shared library that is not PIC.
@@ -400,8 +393,8 @@ 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 (when not using gcc)
-if (UNIX AND CMAKE_GENERATOR STREQUAL "Ninja" AND NOT FILAMENT_USING_GCC)
+# Add colors to ninja builds
+if (UNIX AND CMAKE_GENERATOR STREQUAL "Ninja")
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fcolor-diagnostics")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fcolor-diagnostics")
 endif()
@@ -755,61 +748,12 @@ function(combine_static_libs TARGET OUTPUT DEPS)
 endfunction()

 # ==================================================================================================
-# Configuration importing/exporting prebuilt "/tools" executables
+# Configuration for CMAKE_CROSSCOMPILING.
 # ==================================================================================================
-
-# 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()
-    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)
+    set(IMPORT_EXECUTABLES ${FILAMENT}/${IMPORT_EXECUTABLES_DIR}/ImportExecutables-${CMAKE_BUILD_TYPE}.cmake)
 endif()

 # ==================================================================================================
@@ -872,9 +816,7 @@ add_subdirectory(${LIBRARIES}/utils)
 add_subdirectory(${LIBRARIES}/viewer)
 add_subdirectory(${FILAMENT}/shaders)
 add_subdirectory(${EXTERNAL}/abseil/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}/basisu/tnt)
 add_subdirectory(${EXTERNAL}/civetweb/tnt)
 add_subdirectory(${EXTERNAL}/imgui/tnt)
 add_subdirectory(${EXTERNAL}/robin-map/tnt)
@@ -888,8 +830,7 @@ add_subdirectory(${EXTERNAL}/jsmn/tnt)
 add_subdirectory(${EXTERNAL}/stb/tnt)
 add_subdirectory(${EXTERNAL}/getopt)
 add_subdirectory(${EXTERNAL}/perfetto/tnt)
-add_subdirectory(${EXTERNAL}/basisu/tnt)
-
+add_subdirectory(${EXTERNAL}/zstd/tnt)

 # Note that this has to be placed after mikktspace in order for combine_static_libs to work.
 add_subdirectory(${LIBRARIES}/geometry)
@@ -913,11 +854,6 @@ if (FILAMENT_ENABLE_FGVIEWER)
    add_subdirectory(${LIBRARIES}/fgviewer)
 endif()

-if (FILAMENT_SUPPORTS_WEBP_TEXTURES)
-    add_subdirectory(${EXTERNAL}/libwebp/tnt)
-    add_definitions(-DFILAMENT_SUPPORTS_WEBP_TEXTURES)
-endif()
-
 if (FILAMENT_SUPPORTS_VULKAN)
    add_subdirectory(${LIBRARIES}/bluevk)
    add_subdirectory(${EXTERNAL}/vkmemalloc/tnt)
@@ -976,6 +912,6 @@ if (IS_HOST_PLATFORM)
 endif()

 # Generate exported executables for cross-compiled builds (Android, WebGL, and iOS)
-if ((NOT CMAKE_CROSSCOMPILING AND NOT FILAMENT_IMPORT_PREBUILT_EXECUTABLES) OR FILAMENT_EXPORT_PREBUILT_EXECUTABLES)
+if (NOT CMAKE_CROSSCOMPILING)
    export(TARGETS matc cmgen filamesh mipgen resgen uberz glslminifier FILE ${IMPORT_EXECUTABLES})
 endif()
@@ -31,7 +31,7 @@ repositories {
 }

 dependencies {
-    implementation 'com.google.android.filament:filament-android:1.68.0'
+    implementation 'com.google.android.filament:filament-android:1.66.0'
 }
 ```

@@ -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', '~> 1.68.0'
+pod 'Filament', '~> 1.66.0'
 ```

 ## Documentation
@@ -7,30 +7,6 @@ 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).

-## v1.68.1
-
-
-## 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.
@@ -100,7 +100,7 @@ buildscript {
        'kotlin': '2.0.21',
        'kotlin_coroutines': '1.9.0',
        'buildTools': '35.0.0',
-        'ndk': '29.0.14206865',
+        'ndk': '27.0.11718014',
        'androidx_core': '1.13.1',
        'androidx_annotations': '1.9.0'
    ]
@@ -51,6 +51,10 @@ 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
@@ -161,6 +165,7 @@ 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>
 )
@@ -557,8 +557,7 @@ extern "C" JNIEXPORT void JNICALL Java_com_google_android_filament_Engine_nSetBu
        jboolean disableHandleUseAfterFreeCheck,
        jint preferredShaderLanguage,
        jboolean forceGLES2Context, jboolean assertNativeWindowIsValid,
-        jint gpuContextPriority,
-        jlong sharedUboInitialSizeInBytes) {
+        jint gpuContextPriority) {
    Engine::Builder* builder = (Engine::Builder*) nativeBuilder;
    Engine::Config config = {
            .commandBufferSizeMB = (uint32_t) commandBufferSizeMB,
@@ -577,7 +576,6 @@ 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);
 }
@@ -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, jint uboBatchingMode) {
+        jlong nativeEngine, jobject buffer_, jint size, jint shBandCount, jint shadowQuality) {
    Engine* engine = (Engine*) nativeEngine;
    AutoBuffer buffer(env, buffer_, size);
    auto builder = Material::Builder();
@@ -33,7 +33,6 @@ 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);
@@ -280,17 +279,6 @@ 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,
@@ -147,15 +147,6 @@ 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;
@@ -99,15 +99,6 @@ 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];
@@ -264,8 +264,7 @@ public class Engine {
                    config.disableHandleUseAfterFreeCheck,
                    config.preferredShaderLanguage.ordinal(),
                    config.forceGLES2Context, config.assertNativeWindowIsValid,
-                    config.gpuContextPriority.ordinal(),
-                    config.sharedUboInitialSizeInBytes);
+                    config.gpuContextPriority.ordinal());
            return this;
        }

@@ -526,16 +525,6 @@ 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) {
@@ -1540,8 +1529,7 @@ public class Engine {
            boolean disableHandleUseAfterFreeCheck,
            int preferredShaderLanguage,
            boolean forceGLES2Context, boolean assertNativeWindowIsValid,
-            int gpuContextPriority,
-            long sharedUboInitialSizeInBytes);
+            int gpuContextPriority);
    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);
@@ -261,20 +261,6 @@ 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;
@@ -386,7 +372,6 @@ public class Material {
        private int mSize;
        private int mShBandCount = 0;
        private ShadowSamplingQuality mShadowSamplingQuality = ShadowSamplingQuality.LOW;
-        private UboBatchingMode mUboBatchingMode = UboBatchingMode.DEFAULT;


        /**
@@ -431,17 +416,6 @@ 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.
         *
@@ -454,7 +428,7 @@ public class Material {
        @NonNull
        public Material build(@NonNull Engine engine) {
            long nativeMaterial = nBuilderBuild(engine.getNativeObject(),
-                mBuffer, mSize, mShBandCount, mShadowSamplingQuality.ordinal(), mUboBatchingMode.ordinal());
+                mBuffer, mSize, mShBandCount, mShadowSamplingQuality.ordinal());
            if (nativeMaterial == 0) throw new IllegalStateException("Couldn't create Material");
            return new Material(nativeMaterial);
        }
@@ -813,21 +787,6 @@ 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.
     *
@@ -1120,7 +1079,7 @@ public class Material {
        mNativeObject = 0;
    }

-    private static native long nBuilderBuild(long nativeEngine, @NonNull Buffer buffer, int size, int shBandCount, int shadowQuality, int uboBatchingMode);
+    private static native long nBuilderBuild(long nativeEngine, @NonNull Buffer buffer, int size, int shBandCount, int shadowQuality);
    private static native long nCreateInstance(long nativeMaterial);
    private static native long nCreateInstanceWithName(long nativeMaterial, @NonNull String name);
    private static native long nGetDefaultInstance(long nativeMaterial);
@@ -1152,5 +1111,4 @@ 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);
 }
@@ -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 1.
-     *                   The maximum permissible value is 128.
+     * @param anisotropy Amount of anisotropy, should be a power-of-two. The default is 0.
+     *                   The maximum permissible value is 7.
     */
    public void setAnisotropy(float anisotropy) {
        mSampler = nSetAnisotropy(mSampler, anisotropy);
@@ -25,6 +25,7 @@ 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;

@@ -673,21 +674,6 @@ 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).
     *
@@ -1331,7 +1317,6 @@ 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);
@@ -16,9 +16,6 @@

 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
@@ -29,7 +26,6 @@ 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
@@ -123,8 +119,6 @@ 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()
@@ -311,39 +305,10 @@ 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
@@ -40,21 +40,7 @@ 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)
@@ -22,7 +22,6 @@ 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()
@@ -1,5 +1,5 @@
 GROUP=com.google.android.filament
-VERSION_NAME=1.68.0
+VERSION_NAME=1.66.0

 POM_DESCRIPTION=Real-time physically based rendering engine for Android.

@@ -17,20 +17,12 @@ filamentTools {
 }

 // don't forget to update MainACtivity.kt when/if changing this.
-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) {
+tasks.register('copyMesh', Copy) {
    from "../../../third_party/models/BusterDrone"
    into "src/main/assets/models"
 }

-preBuild.dependsOn copyDamagedHelmetGltf
-preBuild.dependsOn copyBusterGltf
+preBuild.dependsOn copyMesh

 clean.doFirst {
    delete "src/main/assets"
@@ -1,12 +0,0 @@
-*.iml
-.gradle
-/local.properties
-/.idea/workspace.xml
-/.idea/libraries
-/.idea/caches
-/.idea/gradle.xml
-.DS_Store
-/build
-/captures
-/src/main/assets
-.externalNativeBuild
@@ -1,52 +0,0 @@
-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')
-}
@@ -1,22 +0,0 @@
-<?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>
@@ -1,532 +0,0 @@
-/*
- * 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() }
-        }
-    }
-}
@@ -1,53 +0,0 @@
-// 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;
-    }
-}
@@ -1,34 +0,0 @@
-<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>
@@ -1,171 +0,0 @@
-<?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>
@@ -1,5 +0,0 @@
-<?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>
@@ -1,5 +0,0 @@
-<?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>
@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<resources>
-  <color name="colorPrimary">#3F51B5</color>
-  <color name="colorPrimaryDark">#303F9F</color>
-  <color name="colorAccent">#FF4081</color>
-</resources>
@@ -1,3 +0,0 @@
-<resources>
-  <string name="app_name">Material Instance Stress</string>
-</resources>
@@ -1,8 +0,0 @@
-<resources>
-
-  <!-- Base application theme. -->
-  <style name="AppTheme" parent="android:Theme.Material.Light.DarkActionBar">
-    <!-- Customize your theme here. -->
-  </style>
-
-</resources>
@@ -12,7 +12,6 @@ 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'
@@ -77,10 +77,6 @@ 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"
@@ -158,7 +154,7 @@ function print_fgviewer_help {
 }

 # Unless explicitly specified, NDK version will be selected as highest available version within same major release chain
-FILAMENT_NDK_VERSION=$(cat `dirname $0`/build/common/versions | grep GITHUB_NDK_VERSION | sed s/GITHUB_NDK_VERSION=//g | cut -f 1 -d ".")
+FILAMENT_NDK_VERSION=${FILAMENT_NDK_VERSION:-$(cat `dirname $0`/build/common/versions | grep GITHUB_NDK_VERSION | sed s/GITHUB_NDK_VERSION=//g | cut -f 1 -d ".")}

 # Internal variables
 ISSUE_CLEAN=false
@@ -221,11 +217,6 @@ 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=
@@ -251,37 +242,6 @@ 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=$2
@@ -305,7 +265,7 @@ function build_desktop_target {
    if [[ ! -d "CMakeFiles" ]] || [[ "${ISSUE_CMAKE_ALWAYS}" == "true" ]]; then
        cmake \
            -G "${BUILD_GENERATOR}" \
-            ${IMPORT_EXECUTABLES_DIR_OPTION} \
+            -DIMPORT_EXECUTABLES_DIR=out \
            -DCMAKE_BUILD_TYPE="$1" \
            -DCMAKE_INSTALL_PREFIX="../${lc_target}/filament" \
            ${EGL_ON_LINUX_OPTION} \
@@ -371,7 +331,7 @@ function build_webgl_with_target {
        source "${EMSDK}/emsdk_env.sh"
        cmake \
            -G "${BUILD_GENERATOR}" \
-            ${IMPORT_EXECUTABLES_DIR_OPTION} \
+            -DIMPORT_EXECUTABLES_DIR=out \
            -DCMAKE_TOOLCHAIN_FILE="${EMSDK}/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake" \
            -DCMAKE_BUILD_TYPE="$1" \
            -DCMAKE_INSTALL_PREFIX="../webgl-${lc_target}/filament" \
@@ -444,7 +404,7 @@ function build_android_target {
    if [[ ! -d "CMakeFiles" ]] || [[ "${ISSUE_CMAKE_ALWAYS}" == "true" ]]; then
        cmake \
            -G "${BUILD_GENERATOR}" \
-            ${IMPORT_EXECUTABLES_DIR_OPTION} \
+            -DIMPORT_EXECUTABLES_DIR=out \
            -DCMAKE_BUILD_TYPE="$1" \
            -DFILAMENT_NDK_VERSION="${FILAMENT_NDK_VERSION}" \
            -DCMAKE_INSTALL_PREFIX="../android-${lc_target}/filament" \
@@ -678,7 +638,7 @@ function build_ios_target {
    if [[ ! -d "CMakeFiles" ]] || [[ "${ISSUE_CMAKE_ALWAYS}" == "true" ]]; then
        cmake \
            -G "${BUILD_GENERATOR}" \
-            ${IMPORT_EXECUTABLES_DIR_OPTION} \
+            -DIMPORT_EXECUTABLES_DIR=out \
            -DCMAKE_BUILD_TYPE="$1" \
            -DCMAKE_INSTALL_PREFIX="../ios-${lc_target}/filament" \
            -DIOS_ARCH="${arch}" \
@@ -850,7 +810,7 @@ function check_debug_release_build {

 pushd "$(dirname "$0")" > /dev/null

-while getopts ":hacCfgimp:q:uvWslwedtk:bVx:S:X:Py:" opt; do
+while getopts ":hacCfgimp:q:uvWslwedtk:bVx:S:X:P" opt; do
    case ${opt} in
        h)
            print_help
@@ -1019,20 +979,6 @@ while getopts ":hacCfgimp:q:uvWslwedtk:bVx:S:X:Py:" opt; do
            ;;
        X)  OSMESA_OPTION="-DFILAMENT_OSMESA_PATH=${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 ""
@@ -1067,13 +1013,6 @@ 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 [[ "${ISSUE_CLEAN}" == "true" ]]; then
    build_clean
 fi
@@ -18,8 +18,8 @@ if [[ "$GITHUB_WORKFLOW" ]]; then
    fi
 fi

-# Unless explicitly specified, NDK version will be selected as highest available version within same major release chain
-FILAMENT_NDK_VERSION=$(cat `dirname $0`/../common/versions | grep GITHUB_NDK_VERSION | sed s/GITHUB_NDK_VERSION=//g)
+# Unless explicitly specified, NDK version will be set to match exactly the required one
+FILAMENT_NDK_VERSION=${GITHUB_NDK_VERSION:-27.0.11718014}

 (! 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" &&
@@ -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=29.0.14206865
+GITHUB_NDK_VERSION=27.0.11718014
 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
@@ -75,7 +75,7 @@ set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
 #   C_FLAGS += -Wl,-pie
 #   CXX_FLAGS += -lstdc++

-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIE -march=armv8-a -mtune=cortex-a78" CACHE STRING "Toolchain CFLAGS")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIE -mcpu=cortex-a57" 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 "${CMAKE_SHARED_LINKER_FLAGS} -static-libstdc++" CACHE STRING "Toolchain LDFLAGS")
@@ -87,7 +87,7 @@ set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
 # for hardfp: CFLAGS must have -mhard-float
 #             LDFLAGS must have -Wl,--no-warn-mismatch
 #
-set(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS} -mthumb -march=armv7-a -mfloat-abi=softfp -mfpu=neon-vfpv4 -fPIE" CACHE STRING "Toolchain CFLAGS")
+set(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS} -mthumb -march=armv7-a -mcpu=cortex-a15 -mfloat-abi=softfp -mfpu=neon-vfpv4 -fPIE" CACHE STRING "Toolchain CFLAGS")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CMAKE_C_FLAGS}" CACHE STRING "Toolchain CXXFLAGS")
 set(CMAKE_EXE_LINKER_FLAGS    "${CMAKE_EXE_LINKER_FLAGS}    -march=armv7-a -Wl,--no-warn-mismatch -L${TOOLCHAIN}/arm-linux-androideabi/lib/armv7-a -static-libstdc++ -fPIE -pie" CACHE STRING "Toolchain LDFLAGS")
 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -march=armv7-a -Wl,--no-warn-mismatch -L${TOOLCHAIN}/arm-linux-androideabi/lib/armv7-a -static-libstdc++" CACHE STRING "Toolchain LDFLAGS")
@@ -165,8 +165,8 @@ Portal</a>.</p>
 <p>To publish under the <code>com.google.android</code> namespace, you'll also need to email
 <code>central-support@sonatype.com</code> with your account information to request access.</p>
 <p>Then, generate a user token through the Sonatype website. Navigate to
-<a href="https://central.sonatype.com/usertoken">https://central.sonatype.com/usertoken</a>
-and select <strong>Generate User Token</strong>.</p>
+<a href="https://central.sonatype.com/account">https://central.sonatype.com/account</a> and select <strong>Generate
+User Token</strong>.</p>
 <p>Finally, add the generated token credentials to <code>~/.gradle/gradle.properties</code>. (Note: these are
 different from the credentials used to log into your Sonatype account):</p>
 <pre><code class="language-gradle"># Generated Sonatype token
@@ -180,7 +180,7 @@ rm -r Vulkan-Headers-1.3.232 v1.3.232.zip
                                <i class="fa fa-angle-left"></i>
                            </a>

-                            <a rel="next prefetch" href="../dup/fgviewer.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
+                            <a rel="next prefetch" href="../dup/filamat.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
                                <i class="fa fa-angle-right"></i>
                            </a>

@@ -194,7 +194,7 @@ rm -r Vulkan-Headers-1.3.232 v1.3.232.zip
                        <i class="fa fa-angle-left"></i>
                    </a>

-                    <a rel="next prefetch" href="../dup/fgviewer.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
+                    <a rel="next prefetch" href="../dup/filamat.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
                        <i class="fa fa-angle-right"></i>
                    </a>
            </nav>
@@ -200,12 +200,6 @@ inside the Filament source tree.</p>
 force a clean build by adding the <code>-c</code> flag in that case.</p>
 <p>To install the libraries and executables in <code>out/debug/</code> and <code>out/release/</code>, add the <code>-i</code> flag.
 The script offers more features described by executing <code>build.sh -h</code>.</p>
-<p>For more specialized options, please also consider the following pages:</p>
-<ul>
-<li><code>-d</code>: <a href="https://google.github.io/filament/dup/matdbg.html"><code>matdbg</code></a></li>
-<li><code>-t</code>: <a href="https://google.github.io/filament/dup/fgviewer.html"><code>fgviewer</code></a></li>
-<li><code>-b</code> and <code>-y</code>: <a href="https://google.github.io/filament/notes/asan_ubsan.html">ASAN/UBSAN builds</a></li>
-</ul>
 <h3 id="filament-specific-cmake-options"><a class="header" href="#filament-specific-cmake-options">Filament-specific CMake Options</a></h3>
 <p>The following CMake options are boolean options specific to Filament:</p>
 <ul>
@@ -1,345 +0,0 @@
-<!DOCTYPE HTML>
-<html lang="en" class="light sidebar-visible" dir="ltr">
-    <head>
-        <!-- Book generated using mdBook -->
-        <meta charset="UTF-8">
-        <title>fgviewer - Filament</title>
-
-
-        <!-- Custom HTML head -->
-
-        <meta name="description" content="">
-        <meta name="viewport" content="width=device-width, initial-scale=1">
-        <meta name="theme-color" content="#ffffff">
-
-        <link rel="shortcut icon" href="../favicon.png">
-        <link rel="stylesheet" href="../css/variables.css">
-        <link rel="stylesheet" href="../css/general.css">
-        <link rel="stylesheet" href="../css/chrome.css">
-
-        <!-- Fonts -->
-        <link rel="stylesheet" href="../FontAwesome/css/font-awesome.css">
-        <link rel="stylesheet" href="../fonts/fonts.css">
-
-        <!-- Highlight.js Stylesheets -->
-        <link rel="stylesheet" href="../highlight.css">
-        <link rel="stylesheet" href="../tomorrow-night.css">
-        <link rel="stylesheet" href="../ayu-highlight.css">
-
-        <!-- Custom theme stylesheets -->
-
-        <!-- MathJax -->
-        <script async src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
-
-        <!-- Provide site root to javascript -->
-        <script>
-            var path_to_root = "../";
-            var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "light" : "light";
-        </script>
-        <!-- Start loading toc.js asap -->
-        <script src="../toc.js"></script>
-    </head>
-    <body>
-    <div id="body-container">
-        <!-- Work around some values being stored in localStorage wrapped in quotes -->
-        <script>
-            try {
-                var theme = localStorage.getItem('mdbook-theme');
-                var sidebar = localStorage.getItem('mdbook-sidebar');
-
-                if (theme.startsWith('"') && theme.endsWith('"')) {
-                    localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1));
-                }
-
-                if (sidebar.startsWith('"') && sidebar.endsWith('"')) {
-                    localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1));
-                }
-            } catch (e) { }
-        </script>
-
-        <!-- Set the theme before any content is loaded, prevents flash -->
-        <script>
-            var theme;
-            try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
-            if (theme === null || theme === undefined) { theme = default_theme; }
-            const html = document.documentElement;
-            html.classList.remove('light')
-            html.classList.add(theme);
-            html.classList.add("js");
-        </script>
-
-        <input type="checkbox" id="sidebar-toggle-anchor" class="hidden">
-
-        <!-- Hide / unhide sidebar before it is displayed -->
-        <script>
-            var sidebar = null;
-            var sidebar_toggle = document.getElementById("sidebar-toggle-anchor");
-            if (document.body.clientWidth >= 1080) {
-                try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
-                sidebar = sidebar || 'visible';
-            } else {
-                sidebar = 'hidden';
-            }
-            sidebar_toggle.checked = sidebar === 'visible';
-            html.classList.remove('sidebar-visible');
-            html.classList.add("sidebar-" + sidebar);
-        </script>
-
-        <nav id="sidebar" class="sidebar" aria-label="Table of contents">
-            <div style="display:flex;align-items:center;justify-content:center">
-                <img class="flogo" src="../images/filament_logo_small.png"></img>
-            </div>
-            <!-- populated by js -->
-            <mdbook-sidebar-scrollbox class="sidebar-scrollbox"></mdbook-sidebar-scrollbox>
-            <noscript>
-                <iframe class="sidebar-iframe-outer" src="../toc.html"></iframe>
-            </noscript>
-            <div id="sidebar-resize-handle" class="sidebar-resize-handle">
-                <div class="sidebar-resize-indicator"></div>
-            </div>
-        </nav>
-
-        <div id="page-wrapper" class="page-wrapper">
-
-            <div class="page">
-                <div id="menu-bar-hover-placeholder"></div>
-                <div id="menu-bar" class="menu-bar sticky">
-                    <div class="left-buttons">
-                        <label id="sidebar-toggle" class="icon-button" for="sidebar-toggle-anchor" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar">
-                            <i class="fa fa-bars"></i>
-                        </label>
-                        <!-- Filament: disable themes because the markdeep part does not look good for dark themes -->
-                        <!--
-                        <button id="theme-toggle" class="icon-button" type="button" title="Change theme" aria-label="Change theme" aria-haspopup="true" aria-expanded="false" aria-controls="theme-list">
-                            <i class="fa fa-paint-brush"></i>
-                        </button>
-                        <ul id="theme-list" class="theme-popup" aria-label="Themes" role="menu">
-                            <li role="none"><button role="menuitem" class="theme" id="light">Light</button></li>
-                            <li role="none"><button role="menuitem" class="theme" id="rust">Rust</button></li>
-                            <li role="none"><button role="menuitem" class="theme" id="coal">Coal</button></li>
-                            <li role="none"><button role="menuitem" class="theme" id="navy">Navy</button></li>
-                            <li role="none"><button role="menuitem" class="theme" id="ayu">Ayu</button></li>
-                        </ul>
-                        -->
-                        <button id="search-toggle" class="icon-button" type="button" title="Search. (Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar">
-                            <i class="fa fa-search"></i>
-                        </button>
-                    </div>
-
-                    <h1 class="menu-title">Filament</h1>
-
-                    <div class="right-buttons">
-                        <a href="https://github.com/google/filament" title="Git repository" aria-label="Git repository">
-                            <i id="git-repository-button" class="fa fa-github"></i>
-                        </a>
-
-                    </div>
-                </div>
-
-                <div id="search-wrapper" class="hidden">
-                    <form id="searchbar-outer" class="searchbar-outer">
-                        <input type="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header">
-                    </form>
-                    <div id="searchresults-outer" class="searchresults-outer hidden">
-                        <div id="searchresults-header" class="searchresults-header"></div>
-                        <ul id="searchresults">
-                        </ul>
-                    </div>
-                </div>
-
-                <!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM -->
-                <script>
-                    document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible');
-                    document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible');
-                    Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) {
-                        link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
-                    });
-                </script>
-
-                <div id="content" class="content">
-                    <main>
-                        <h1 id="fgviewer"><a class="header" href="#fgviewer">fgviewer</a></h1>
-<ol>
-<li><a href="#capabilities">Capabilities</a></li>
-<li><a href="#setup-for-desktop">Setup for Desktop</a></li>
-<li><a href="#setup-for-android">Setup for Android</a></li>
-<li><a href="#debugger-usage">Debugger Usage</a></li>
-<li><a href="#architecture-overview">Architecture Overview</a></li>
-<li><a href="#c-server">C++ Server</a></li>
-<li><a href="#javascript-client">JavaScript Client</a></li>
-<li><a href="#http-requests">HTTP Requests</a></li>
-<li><a href="#wish-list">Wish List</a></li>
-</ol>
-<h2 id="capabilities"><a class="header" href="#capabilities">Capabilities</a></h2>
-<p>fgviewer is a library and web application for real-time visualization of the frame graph in Filament.
-It displays active passes and resource usage, providing insights into the rendering pipeline.</p>
-<h2 id="setup-for-desktop"><a class="header" href="#setup-for-desktop">Setup for Desktop</a></h2>
-<p>When using the easy build script, include the <code>-t</code> argument. For example:</p>
-<pre><code>./build.sh -ft debug gltf_viewer
-</code></pre>
-<p>The <code>t</code> enables a CMake option called <code>FILAMENT_ENABLE_FGVIEWER</code> and the <code>f</code> ensures that CMake gets
-re-run so that the option is honored.</p>
-<p>Next, set an environment variable as follows. In Windows, use <code>set</code> instead of <code>export</code>.</p>
-<pre><code>export FILAMENT_FGVIEWER_PORT=8050
-</code></pre>
-<p>Next, launch any app that links against a debug build of a Filament and point your web browser to
-http://localhost:8050. Skip ahead to <strong>Debugger Usage</strong>.</p>
-<h2 id="setup-for-android"><a class="header" href="#setup-for-android">Setup for Android</a></h2>
-<p>Rebuild Filament for Android after enabling a CMake option called <code>FILAMENT_ENABLE_FGVIEWER</code>. Note that
-CMake is invoked from several places for Android (both gradle and our easy build script), so one
-pragmatic and reliable way of doing this is to simply hack <code>CMakeLists.txt</code> and
-<code>filament-android/CMakeLists.txt</code> by unconditionally setting <code>FILAMENT_ENABLE_FGVIEWER</code> to <code>ON</code>.</p>
-<p>After rebuilding Filament with the option enabled, ensure that internet permissions are enabled in
-your app by adding the following into your manifest as a child of the <code>&lt;manifest&gt;</code> element.</p>
-<pre><code>&lt;uses-permission android:name="android.permission.INTERNET" /&gt;
-</code></pre>
-<p>Now launch your app as usual. The Filament Engine sets up a server that is hardcoded to listen to
-port <code>8085</code>. Next, you will need to forward your device's TCP port <code>8085</code> to your host port of choice.
-For example, to forward the fgviewer server on your device to port <code>8085</code> on your host machine, do the
-following:</p>
-<pre><code>adb forward tcp:8085 tcp:8085
-</code></pre>
-<p>This lets you go to http://localhost:8085 in Chrome on your host machine.</p>
-<h2 id="debugger-usage"><a class="header" href="#debugger-usage">Debugger Usage</a></h2>
-<p>After opening the fgviewer page in your browser, you can see the active views are on the left panel.
-Then you can select any of them to see the active passes and resources for that view.</p>
-<p align="center">
-  <img width="600px" src=https://github.com/user-attachments/assets/2d31767f-fc25-4f17-8c14-528fe5c6b698>
-</p>
-<h2 id="architecture-overview"><a class="header" href="#architecture-overview">Architecture Overview</a></h2>
-<p align="center">
-  <img width="450" src=https://github.com/user-attachments/assets/537ebb89-6ad0-4b93-bbeb-207d4fe9ec5a>
-</p>
-<p>The fgviewer library has two parts: a C++ server and a JavaScript client. The C++ server is
-responsible for instancing a <a href="https://github.com/civetweb/civetweb">civetweb</a> context that handles HTTP requests. The
-JavaScript client is a small web app that contains a view into an in-browser database of framegraphs.</p>
-<p>When a new connection is established, the client asks the server for a list of framegraphs
-in order to populate its in-browser database. If the connection is lost (e.g. if the app crashes),
-then the database stays intact and the web app is still functional.</p>
-<h2 id="c-server"><a class="header" href="#c-server">C++ Server</a></h2>
-<p>The civetweb server is wrapped by our <code>DebugServer</code> class, which provides a public interface consisting of
-a few methods invoked by the Filament engine.</p>
-<p>Since each view corresponds to a frame graph, the engine should notify <code>DebugServer</code> of any changes to the views
-on the engine side.</p>
-<ul>
-<li><strong>createView</strong> Notifies the debugger that a new view has been created.</li>
-<li><strong>updateView</strong> Notifies the debugger of updates to an existing view.</li>
-<li><strong>destroyView</strong> Notifies the debugger that a view is being removed.</li>
-</ul>
-<h2 id="javascript-client"><a class="header" href="#javascript-client">JavaScript Client</a></h2>
-<p>The web app is built using LitElement, a lightweight library for creating Web Components. Our goal is to keep the code simple and modern, avoiding frameworks like React or Angular.</p>
-<p>The app presents a view over a pseudo-database, which is essentially a global variable holding a dictionary that maps frame graph ids to objects following the JSON structure described below.</p>
-<h2 id="http-requests"><a class="header" href="#http-requests">HTTP requests</a></h2>
-<p>The server responds to the following GET requests by returning a JSON blob. The <code>{id}</code> in these
-requests is a concept specific to fgviewer (not Filament) which is an 8-digit hex string for identifying frame graphs.</p>
-<hr />
-<p><code>/api/framegraphs</code></p>
-<p>Returns an array containing all framegraphs in an app. Example:</p>
-<pre><code class="language-json">[{
-    "fgid": "00000000",
-    "viewName": "Main View",
-    "passes": [{
-        "name": "shadow pass",
-        "reads": [],
-        "writes": ["0"]
-    }],
-    "resources": [{
-        "id": "0",
-        "name": "shadowmap",
-        "properties": [{"resolution": "256x256"}, {"is_subresource": "false"}]
-    }]
-},
-{
-    "fgid": "00000001",
-    "viewName": "UI view",
-    ...
-}]
-</code></pre>
-<hr />
-<p><code>/api/framegraph?fg={id}</code></p>
-<p>Returns a specific framegraph info. Example:</p>
-<pre><code class="language-json">{
-  "fgid": "00000000",
-  "viewName": "Main View",
-  "passes": [{
-    "name": "shadow pass",
-    "reads": [],
-    "writes": ["0"]
-  }],
-  "resources": [{
-    "id": "0",
-    "name": "shadowmap",
-    "properties": [{"resolution": "256x256"}, {"is_subresource": "false"}]
-  }]
-}
-</code></pre>
-<hr />
-<p><code>/api/status</code></p>
-<p>Returns one of the below:</p>
-<ul>
-<li><code>0</code>: first time connected</li>
-<li><code>1</code>: no-op</li>
-<li><code>{fgid}</code>: the corresponding frame graph has an update
-<ul>
-<li>Then the web view can request for the actual info using the previous api</li>
-</ul>
-</li>
-</ul>
-<p>If the request gets timeout, the web page show disconnected to the user.</p>
-<hr />
-<h2 id="wish-list"><a class="header" href="#wish-list">Wish List</a></h2>
-<ul>
-<li>Display the texture contents on the webview</li>
-</ul>
-
-                    </main>
-
-                    <nav class="nav-wrapper" aria-label="Page navigation">
-                        <!-- Mobile navigation buttons -->
-                            <a rel="prev" href="../dup/bluevk.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
-                                <i class="fa fa-angle-left"></i>
-                            </a>
-
-                            <a rel="next prefetch" href="../dup/filamat.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
-                                <i class="fa fa-angle-right"></i>
-                            </a>
-
-                        <div style="clear: both"></div>
-                    </nav>
-                </div>
-            </div>
-
-            <nav class="nav-wide-wrapper" aria-label="Page navigation">
-                    <a rel="prev" href="../dup/bluevk.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
-                        <i class="fa fa-angle-left"></i>
-                    </a>
-
-                    <a rel="next prefetch" href="../dup/filamat.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
-                        <i class="fa fa-angle-right"></i>
-                    </a>
-            </nav>
-
-        </div>
-
-
-
-
-        <script>
-            window.playground_copyable = true;
-        </script>
-
-
-        <script src="../elasticlunr.min.js"></script>
-        <script src="../mark.min.js"></script>
-        <script src="../searcher.js"></script>
-
-        <script src="../clipboard.min.js"></script>
-        <script src="../highlight.js"></script>
-        <script src="../book.js"></script>
-
-        <!-- Custom JS scripts -->
-
-
-    </div>
-    </body>
-</html>
@@ -336,7 +336,7 @@ void material(inout MaterialInputs material) {

                    <nav class="nav-wrapper" aria-label="Page navigation">
                        <!-- Mobile navigation buttons -->
-                            <a rel="prev" href="../dup/fgviewer.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
+                            <a rel="prev" href="../dup/bluevk.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
                                <i class="fa fa-angle-left"></i>
                            </a>

@@ -350,7 +350,7 @@ void material(inout MaterialInputs material) {
            </div>

            <nav class="nav-wide-wrapper" aria-label="Page navigation">
-                    <a rel="prev" href="../dup/fgviewer.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
+                    <a rel="prev" href="../dup/bluevk.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
                        <i class="fa fa-angle-left"></i>
                    </a>

@@ -181,7 +181,7 @@ important for <code>matc</code> (material compiler).</p>
 }

 dependencies {
-    implementation 'com.google.android.filament:filament-android:1.68.0'
+    implementation 'com.google.android.filament:filament-android:1.66.0'
 }
 </code></pre>
 <p>Here are all the libraries available in the group <code>com.google.android.filament</code>:</p>
@@ -196,7 +196,7 @@ dependencies {
 </div>
 <h3 id="ios"><a class="header" href="#ios">iOS</a></h3>
 <p>iOS projects can use CocoaPods to install the latest release:</p>
-<pre><code class="language-shell">pod 'Filament', '~&gt; 1.68.0'
+<pre><code class="language-shell">pod 'Filament', '~&gt; 1.66.0'
 </code></pre>
 <h2 id="documentation"><a class="header" href="#documentation">Documentation</a></h2>
 <ul>
@@ -160,15 +160,10 @@
                    <main>
                        <h1 id="running-with-asanubsan"><a class="header" href="#running-with-asanubsan">Running with ASAN/UBSAN</a></h1>
 <h2 id="enabling"><a class="header" href="#enabling">Enabling</a></h2>
-<p>When building though <code>build.sh</code>, pass the <code>-b</code> flag. This sets the cmake variable
+<p>When building though build.sh, pass the <code>-b</code> flag. This sets the cmake variable
 <code>FILAMENT_ENABLE_ASAN_UBSAN=ON</code> which eventually passes <code>"-fsanitize=address -fsanitize=undefined"</code>
 to all compile and link operations.</p>
-<p>It might be desirable to pair the <code>-b</code> with <code>-y release</code>. The <code>-y</code> flag indicates that targets
-in <code>/tools</code> will be built separately from the filament target, and the filament build depends on
-the <code>/tools</code> targets as prebuilt binaries. This separation reduces ASAN/UBSAN build time
-considerably. This option assumes that the user is trying to catch sanitization issues for
-filament and not the tools that are used to build filament.</p>
-<p>If building through CMake directly, or an IDE like CLion that doesn't use <code>build.sh</code>, instead pass
+<p>If building through CMake directly, or an IDE like CLion that doesn't use build.sh, instead pass
 <code>-DFILAMENT_ENABLE_ASAN_UBSAN=ON</code> to cmake in order to get the same result.</p>
 <h2 id="getting-memory-leak-detection-on-mac"><a class="header" href="#getting-memory-leak-detection-on-mac">Getting memory leak detection on Mac</a></h2>
 <p>Memory leak detection isn't enabled by default on MacOS. There are two issues to address, first is
@@ -8,10 +8,10 @@ tar -xvzf filament-release-web.tgz
 rm filament-release-web.tgz
 rm filament-web.zip
 rm filament.d.ts
-cp ../../../web/samples/remote.html index.html
+cp ../../web/samples/remote.html index.html

 popd

 git status
 echo ""
-echo "All done! Next, commit the changed files"
+echo "All done! Next, make a git commit that updates docs/remote."
@@ -46,9 +46,6 @@
    "libs/matdbg/README.md": {
        "dest": "dup/matdbg.md"
    },
-    "libs/fgviewer/README.md": {
-        "dest": "dup/fgviewer.md"
-    },
    "tools/normal-blending/README.md": {
        "dest": "dup/normal_blending.md"
    },
@@ -1,15 +0,0 @@
-attrs==25.4.0
-certifi==2025.10.5
-h11==0.16.0
-idna==3.11
-outcome==1.3.0.post0
-PySocks==1.7.1
-selenium==4.37.0
-sniffio==1.3.1
-sortedcontainers==2.4.0
-trio==0.31.0
-trio-websocket==0.12.2
-typing_extensions==4.15.0
-urllib3==2.6.0
-websocket-client==1.9.0
-wsproto==1.2.0
@@ -140,8 +140,6 @@ if __name__ == "__main__":
  res, err = execute('mdbook build', cwd=MDBOOK_DIR)
  assert res == 0, f"failed to execute `mdbook`. return-code={res} err=\"{err}\""

-  RAW_IGNORES = shutil.ignore_patterns('update_remote_ui.sh')
-
-  shutil.copytree(RAW_COPIES_DIR, BOOK_OUPUT_DIR, ignore=RAW_IGNORES, dirs_exist_ok=True)
+  shutil.copytree(RAW_COPIES_DIR, BOOK_OUPUT_DIR, dirs_exist_ok=True)
  shutil.copy(os.path.join(MARKDEEP_DIR, FILAMENT_MD), BOOK_OUPUT_DIR)
  shutil.copy(os.path.join(MARKDEEP_DIR, MATERIALS_MD), BOOK_OUPUT_DIR)
@@ -32,7 +32,6 @@
  - [Libraries](./notes/libs.md)
    - [bluegl](./dup/bluegl.md)
    - [bluevk](./dup/bluevk.md)
-    - [fgviewer](./dup/fgviewer.md)
    - [filamat](./dup/filamat.md)
    - [gltfio](./dup/gltfio.md)
    - [iblprefilter](./dup/iblprefilter.md)
@@ -9,8 +9,8 @@ To publish under the `com.google.android` namespace, you'll also need to email
 `central-support@sonatype.com` with your account information to request access.

 Then, generate a user token through the Sonatype website. Navigate to
-[https://central.sonatype.com/usertoken](https://central.sonatype.com/usertoken)
-and select **Generate User Token**.
+[https://central.sonatype.com/account](https://central.sonatype.com/account) and select **Generate
+User Token**.

 Finally, add the generated token credentials to `~/.gradle/gradle.properties`. (Note: these are
 different from the credentials used to log into your Sonatype account):
@@ -2,17 +2,11 @@

 ## Enabling

-When building though `build.sh`, pass the `-b` flag. This sets the cmake variable
+When building though build.sh, pass the `-b` flag. This sets the cmake variable
 `FILAMENT_ENABLE_ASAN_UBSAN=ON` which eventually passes `"-fsanitize=address -fsanitize=undefined"`
 to all compile and link operations.

-It might be desirable to pair the `-b` with `-y release`. The `-y` flag indicates that targets
-in `/tools` will be built separately from the filament target, and the filament build depends on
-the `/tools` targets as prebuilt binaries. This separation reduces ASAN/UBSAN build time
-considerably. This option assumes that the user is trying to catch sanitization issues for
-filament and not the tools that are used to build filament.
-
-If building through CMake directly, or an IDE like CLion that doesn't use `build.sh`, instead pass
+If building through CMake directly, or an IDE like CLion that doesn't use build.sh, instead pass
 `-DFILAMENT_ENABLE_ASAN_UBSAN=ON` to cmake in order to get the same result.

 ## Getting memory leak detection on Mac
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+pushd "$(dirname "$0")" > /dev/null
+
+curl -OL https://nightly.link/google/filament/workflows/web-continuous/main/filament-web.zip
+unzip -q filament-web.zip
+tar -xvzf filament-release-web.tgz
+rm filament-release-web.tgz
+rm filament-web.zip
+rm filament.d.ts
+cp ../../web/samples/remote.html index.html
+
+popd
+
+git status
+echo ""
+echo "All done! Next, make a git commit that updates docs/remote."
@@ -139,7 +139,6 @@ set(SRCS
        src/details/SwapChain.cpp
        src/details/Sync.cpp
        src/details/Texture.cpp
-        src/details/UboManager.cpp
        src/details/VertexBuffer.cpp
        src/details/View.cpp
        src/ds/PerViewDescriptorSetUtils.cpp
@@ -219,7 +218,6 @@ set(PRIVATE_HDRS
        src/details/Stream.h
        src/details/SwapChain.h
        src/details/Texture.h
-        src/details/UboManager.h
        src/details/VertexBuffer.h
        src/details/View.h
        src/downcast.h
@@ -365,7 +363,7 @@ add_definitions(
 # Generate all .filamat: default material, skyboxes, and post-process
 # ==================================================================================================

-if (CMAKE_CROSSCOMPILING OR FILAMENT_IMPORT_PREBUILT_EXECUTABLES)
+if (CMAKE_CROSSCOMPILING)
    include(${IMPORT_EXECUTABLES})
 endif()

@@ -710,13 +708,6 @@ if (MSVC)
 elseif(WEBGL)
    # Avoid strict-vtable-pointers here, it is broken in WebAssembly.
    set(OPTIMIZATION_FLAGS -fvisibility-inlines-hidden)
-elseif(FILAMENT_USING_GCC)
-    set(OPTIMIZATION_FLAGS
-        -ffast-math
-        -fno-finite-math-only
-        -ffp-contract=fast
-        -fvisibility-inlines-hidden
-    )
 else()
    set(OPTIMIZATION_FLAGS
        -ffast-math
@@ -738,18 +729,6 @@ set(LINUX_COMPILER_FLAGS

 if (MSVC)
    set(FILAMENT_WARNINGS /W3)
-elseif (FILAMENT_USING_GCC)
-    # GCC is not officially supported, so use a weaker set of warnings (incl. not using -Werror).
-    set(FILAMENT_WARNINGS
-            -Wall -Wextra-semi -Wundef
-            -Wno-unused-parameter -Wno-missing-field-initializers
-            -Wno-unused-but-set-variable -Wno-unused-variable -Wno-unused-function
-            -Wnon-virtual-dtor -Wimplicit-fallthrough
-            -Wno-strict-aliasing
-            -Wno-changes-meaning -Wno-return-type
-            -Wno-invalid-constexpr -Wno-parentheses
-            -Wno-sign-compare -Wno-deprecated-declarations
-    )
 else()
    set(FILAMENT_WARNINGS
            -Wall -Wextra -Wno-unused-parameter -Wno-missing-field-initializers
@@ -92,7 +92,7 @@ Copy your platform's Makefile below into a `Makefile` inside the same directory.
 ### Linux

 ```make
-FILAMENT_LIBS=-lfilament -lbackend -lbluegl -lbluevk -lfilabridge -lfilaflat -lutils -lgeometry -lsmol-v -libl -labseil
+FILAMENT_LIBS=-lfilament -lbackend -lbluegl -lbluevk -lfilabridge -lfilaflat -lutils -lgeometry -lsmol-v -lvkshaders -libl -labseil
 CC=clang++

 main: main.o
@@ -110,7 +110,7 @@ clean:
 ### macOS

 ```make
-FILAMENT_LIBS=-lfilament -lbackend -lbluegl -lbluevk -lfilabridge -lfilaflat -lutils -lgeometry -lsmol-v -libl -labseil
+FILAMENT_LIBS=-lfilament -lbackend -lbluegl -lbluevk -lfilabridge -lfilaflat -lutils -lgeometry -lsmol-v -lvkshaders -libl -labseil
 FRAMEWORKS=-framework Cocoa -framework Metal -framework CoreVideo
 CC=clang++
 ARCH ?= $(shell uname -m)
@@ -140,7 +140,7 @@ used to change the run-time library version.

 ```make
 FILAMENT_LIBS=filament.lib backend.lib bluegl.lib bluevk.lib filabridge.lib filaflat.lib \
-              utils.lib geometry.lib smol-v.lib ibl.lib abseil.lib
+              utils.lib geometry.lib smol-v.lib ibl.lib vkshaders.lib abseil.lib
 CC=cl.exe

 main.exe: main.obj
@@ -104,10 +104,6 @@ if (FILAMENT_SUPPORTS_OPENGL AND NOT FILAMENT_USE_EXTERNAL_GLES3)
        list(APPEND SRCS src/VirtualMachineEnv.cpp)
    endif ()
    if (ANDROID)
-        list(APPEND SRCS src/AndroidNdk.cpp)
-        list(APPEND SRCS src/AndroidNativeWindow.cpp)
-        list(APPEND SRCS src/AndroidSwapChainHelper.cpp)
-        list(APPEND SRCS src/AndroidFrameCallback.cpp)
        list(APPEND SRCS src/opengl/platforms/ExternalStreamManagerAndroid.cpp)
        list(APPEND SRCS src/opengl/platforms/PlatformEGLAndroid.cpp)
    elseif (IOS)
@@ -206,8 +202,6 @@ if (FILAMENT_SUPPORTS_VULKAN)
            src/vulkan/VulkanDriverFactory.h
            src/vulkan/VulkanExternalImageManager.cpp
            src/vulkan/VulkanExternalImageManager.h
-            src/vulkan/VulkanStreamedImageManager.cpp
-            src/vulkan/VulkanStreamedImageManager.h
            src/vulkan/VulkanFboCache.cpp
            src/vulkan/VulkanFboCache.h
            src/vulkan/VulkanHandles.cpp
@@ -254,21 +248,10 @@ if (FILAMENT_SUPPORTS_VULKAN)
            src/vulkan/utils/Spirv.h
            src/vulkan/utils/StaticVector.h
    )
-    if (LINUX)
-        list(APPEND SRCS
-            src/vulkan/platform/VulkanPlatformLinux.cpp
-            include/backend/platforms/VulkanPlatformLinux.h
-        )
-    elseif (WIN32)
-        list(APPEND SRCS
-            include/backend/platforms/VulkanPlatformWindows.h
-            src/vulkan/platform/VulkanPlatformWindows.cpp
-        )
+    if (LINUX OR WIN32)
+        list(APPEND SRCS src/vulkan/platform/VulkanPlatformLinuxWindows.cpp)
    elseif (APPLE OR IOS)
-        list(APPEND SRCS
-            include/backend/platforms/VulkanPlatformApple.h
-            src/vulkan/platform/VulkanPlatformApple.mm
-        )
+        list(APPEND SRCS src/vulkan/platform/VulkanPlatformApple.mm)
    elseif (ANDROID)
        list(APPEND SRCS
            include/backend/platforms/VulkanPlatformAndroid.h
@@ -318,8 +301,6 @@ if (FILAMENT_SUPPORTS_WEBGPU)
            src/webgpu/WebGPURenderPrimitive.h
            src/webgpu/WebGPURenderTarget.cpp
            src/webgpu/WebGPURenderTarget.h
-            src/webgpu/WebGPUStagePool.cpp
-            src/webgpu/WebGPUStagePool.h
            src/webgpu/WebGPUStrings.h
            src/webgpu/WebGPUSwapChain.cpp
            src/webgpu/WebGPUSwapChain.h
@@ -386,6 +367,46 @@ endif()
 add_library(${TARGET}_headers INTERFACE)
 target_include_directories(${TARGET}_headers INTERFACE ${PUBLIC_HDR_DIR})

+# ==================================================================================================
+# Build SPIRV snippets used by the Vulkan backend.
+# ==================================================================================================
+
+set(VKSHADERS_DIR  "${CMAKE_CURRENT_BINARY_DIR}/generated/vkshaders")
+
+file(MAKE_DIRECTORY ${VKSHADERS_DIR})
+
+get_resgen_vars(${VKSHADERS_DIR} vkshaders)
+
+set(VKSHADER_BINS)
+function(build_vkshader SOURCE TARGET_PATH)
+    set(SOURCE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/src/vulkan/${SOURCE}")
+    set(VKSHADER_BINS ${VKSHADER_BINS} ${TARGET_PATH} PARENT_SCOPE)
+    add_custom_command(
+            OUTPUT ${TARGET_PATH}
+            COMMAND matc --raw -o ${TARGET_PATH} ${SOURCE_PATH}
+            MAIN_DEPENDENCY ${SOURCE_PATH}
+            DEPENDS matc ${SOURCE_PATH}
+            COMMENT "Building SPIR-V")
+endfunction()
+build_vkshader("BlitDepth.vs" "BlitDepthVs.spv")
+build_vkshader("BlitDepth.fs" "BlitDepthFs.spv")
+
+add_custom_command(
+        OUTPUT ${RESGEN_OUTPUTS}
+        COMMAND resgen ${RESGEN_FLAGS} ${VKSHADER_BINS}
+        DEPENDS resgen ${VKSHADER_BINS}
+        COMMENT "Aggregating compiled VK shaders")
+
+if (DEFINED RESGEN_SOURCE_FLAGS)
+    set_source_files_properties(${RESGEN_SOURCE} PROPERTIES COMPILE_FLAGS ${RESGEN_SOURCE_FLAGS})
+endif()
+
+set(DUMMY_SRC "${VKSHADERS_DIR}/dummy.c")
+add_custom_command(OUTPUT ${DUMMY_SRC} COMMAND echo "//" > ${DUMMY_SRC})
+
+add_library(vkshaders STATIC ${DUMMY_SRC} ${RESGEN_SOURCE})
+set_target_properties(vkshaders PROPERTIES FOLDER Filament/Generated)
+
 # ==================================================================================================
 # Dependencies
 # ==================================================================================================
@@ -419,7 +440,7 @@ if(FILAMENT_SUPPORTS_OPENGL AND NOT IOS AND NOT ANDROID AND NOT WEBGL)
 endif()

 if (FILAMENT_SUPPORTS_VULKAN)
-    target_link_libraries(${TARGET} PUBLIC bluevk vkmemalloc smol-v)
+    target_link_libraries(${TARGET} PUBLIC bluevk vkmemalloc vkshaders smol-v)
    target_link_libraries(${TARGET} PRIVATE SPIRV-Headers)
 endif()

@@ -448,13 +469,6 @@ if (MSVC)
 elseif(WEBGL)
    # Avoid strict-vtable-pointers here, it is broken in WebAssembly.
    set(OPTIMIZATION_FLAGS -fvisibility-inlines-hidden)
-elseif(FILAMENT_USING_GCC)
-    set(OPTIMIZATION_FLAGS
-        -ffast-math
-        -fno-finite-math-only
-        -ffp-contract=fast
-        -fvisibility-inlines-hidden
-    )
 else()
    set(OPTIMIZATION_FLAGS
        -ffast-math
@@ -481,13 +495,6 @@ endif()

 if (MSVC)
    set(FILAMENT_WARNINGS /W3)
-elseif (FILAMENT_USING_GCC)
-    # GCC is not officially supported, so use a weaker set of warnings (incl. not using -Werror)
-    set(FILAMENT_WARNINGS
-            -Wall -Wno-unused-parameter -Wno-missing-field-initializers
-            -Wdeprecated -Wnon-virtual-dtor -Wno-strict-aliasing
-            -Wno-invalid-constexpr -Wno-parentheses -Wno-unused-variable
-    )
 else()
    set(FILAMENT_WARNINGS
            -Wall -Wextra -Wno-unused-parameter -Wno-missing-field-initializers
@@ -538,7 +545,7 @@ endif()
 # ==================================================================================================
 set(INSTALL_TYPE ARCHIVE)
 install(TARGETS ${TARGET} ${INSTALL_TYPE} DESTINATION lib/${DIST_DIR})
-install(TARGETS ${INSTALL_TYPE} DESTINATION lib/${DIST_DIR})
+install(TARGETS vkshaders ${INSTALL_TYPE} DESTINATION lib/${DIST_DIR})
 install(DIRECTORY ${PUBLIC_HDR_DIR}/backend DESTINATION include)

 if (FILAMENT_SUPPORTS_WEBGPU)
@@ -569,7 +576,6 @@ if (APPLE OR LINUX)
        test/test_BufferUpdates.cpp
        test/test_Callbacks.cpp
        test/test_MemoryMappedBuffer.cpp
-        test/test_MsaaSwapChain.cpp
        test/test_MRT.cpp
        test/test_PushConstants.cpp
        test/test_LoadImage.cpp
@@ -0,0 +1,63 @@
+/*
+ * 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.
+ */
+
+#ifndef TNT_FILAMENT_BACKEND_BUFFEROBJECTSTREAMDESCRIPTOR_H
+#define TNT_FILAMENT_BACKEND_BUFFEROBJECTSTREAMDESCRIPTOR_H
+
+#include <backend/Handle.h>
+
+#include <vector>
+
+namespace filament::backend {
+
+/**
+ * The type of association between a buffer object and a stream.
+ */
+ enum class BufferObjectStreamAssociationType { TRANSFORM_MATRIX };
+
+/**
+ * A descriptor for a buffer object to stream association.
+ */
+class UTILS_PUBLIC BufferObjectStreamDescriptor {
+public:
+    //! creates an empty descriptor
+    BufferObjectStreamDescriptor() noexcept = default;
+
+    BufferObjectStreamDescriptor(const BufferObjectStreamDescriptor& rhs) = delete;
+    BufferObjectStreamDescriptor& operator=(const BufferObjectStreamDescriptor& rhs) = delete;
+
+    BufferObjectStreamDescriptor(BufferObjectStreamDescriptor&& rhs) = default;
+    BufferObjectStreamDescriptor& operator=(BufferObjectStreamDescriptor&& rhs) = default;
+
+    // --------------------------------------------------------------------------------------------
+
+    struct StreamDataDescriptor {
+        uint32_t offset;
+        Handle<HwStream> stream;
+        BufferObjectStreamAssociationType associationType;
+    };
+
+    std::vector<StreamDataDescriptor> mStreams;
+};
+
+} // namespace filament::backend
+
+#if !defined(NDEBUG)
+utils::io::ostream& operator<<(utils::io::ostream& out,
+        const filament::backend::BufferObjectStreamDescriptor& b);
+#endif
+
+#endif // TNT_FILAMENT_BACKEND_BUFFEROBJECTSTREAMDESCRIPTOR_H
@@ -1681,7 +1681,7 @@ static_assert(sizeof(StencilState::StencilOperations) == 5u,
 static_assert(sizeof(StencilState) == 12u,
        "StencilState size not what was intended");

-using FrameScheduledCallback = utils::Invocable<void(PresentCallable)>;
+using FrameScheduledCallback = utils::Invocable<void(backend::PresentCallable)>;

 enum class Workaround : uint16_t {
    // The EASU pass must split because shader compiler flattens early-exit branch
@@ -1707,13 +1707,7 @@ enum class Workaround : uint16_t {
    EMULATE_SRGB_SWAPCHAIN,
 };

-using StereoscopicType = Platform::StereoscopicType;
-
-using FrameTimestamps = Platform::FrameTimestamps;
-
-using CompositorTiming = Platform::CompositorTiming;
-
-using AsynchronousMode = Platform::AsynchronousMode;
+using StereoscopicType = backend::Platform::StereoscopicType;

 } // namespace filament::backend

@@ -19,17 +19,13 @@
 #ifndef TNT_FILAMENT_BACKEND_PLATFORM_H
 #define TNT_FILAMENT_BACKEND_PLATFORM_H

-#include <utils/CString.h>
 #include <utils/compiler.h>
 #include <utils/Invocable.h>
-#include <utils/Mutex.h>

 #include <stddef.h>
 #include <stdint.h>

 #include <atomic>
-#include <memory>
-#include <mutex>

 namespace filament::backend {

@@ -74,9 +70,6 @@ public:
        ExternalImageHandle& operator=(ExternalImageHandle const& rhs) noexcept;
        ExternalImageHandle& operator=(ExternalImageHandle&& rhs) noexcept;

-        bool operator==(const ExternalImageHandle& rhs) const noexcept {
-            return mTarget == rhs.mTarget;
-        }
        explicit operator bool() const noexcept { return mTarget != nullptr; }

        ExternalImage* UTILS_NULLABLE get() noexcept { return mTarget; }
@@ -98,113 +91,6 @@ public:

    using ExternalImageHandleRef = ExternalImageHandle const&;

-    struct CompositorTiming {
-        /** duration in nanosecond since epoch of std::steady_clock */
-        using time_point_ns = int64_t;
-        /** duration in nanosecond on the std::steady_clock */
-        using duration_ns = int64_t;
-        static constexpr time_point_ns INVALID = -1;    //!< value not supported
-        /**
-         * The timestamp [ns] since epoch of the next time the compositor will begin composition.
-         * This is effectively the deadline for when the compositor must receive a newly queued
-         * frame.
-         */
-        time_point_ns compositeDeadline;
-
-        /**
-         * The time delta [ns] between subsequent composition events.
-         */
-        duration_ns compositeInterval;
-
-        /**
-         * The time delta [ns] between the start of composition and the expected present time of
-         * that composition. This can be used to estimate the latency of the actual present time.
-         */
-        duration_ns compositeToPresentLatency;
-
-        /**
-         * The timestamp [ns] since epoch of the system's expected presentation time.
-         * INVALID if not supported.
-         */
-        time_point_ns expectedPresentTime;
-
-        /**
-         * The timestamp [ns] since epoch of the current frame's start (i.e. vsync)
-         * INVALID if not supported.
-         */
-        time_point_ns frameTime;
-
-        /**
-         * The timestamp [ns] since epoch of the current frame's deadline
-         * INVALID if not supported.
-         */
-        time_point_ns frameTimelineDeadline;
-    };
-
-    struct FrameTimestamps {
-        /** duration in nanosecond since epoch of std::steady_clock */
-        using time_point_ns = int64_t;
-        static constexpr time_point_ns INVALID = -1;    //!< value not supported
-        static constexpr time_point_ns PENDING = -2;    //!< value not yet available
-
-        /**
-         * The time the application requested this frame be presented.
-         * If the application does not request a presentation time explicitly,
-         * this will correspond to buffer's queue time.
-         */
-        time_point_ns requestedPresentTime;
-
-        /**
-         * The time when all the application's rendering to the surface was completed.
-         */
-        time_point_ns acquireTime;
-
-        /**
-         * The time when the compositor selected this frame as the one to use for the next
-         * composition. This is the earliest indication that the frame was submitted in time.
-         */
-        time_point_ns latchTime;
-
-        /**
-         * The first time at which the compositor began preparing composition for this frame.
-         * Zero if composition was handled by the display and the compositor didn't do any
-         * rendering.
-         */
-        time_point_ns firstCompositionStartTime;
-
-        /**
-         * The last time at which the compositor began preparing composition for this frame, for
-         * frames composited more than once. Zero if composition was handled by the display and the
-         * compositor didn't do any rendering.
-         */
-        time_point_ns lastCompositionStartTime;
-
-        /**
-         * The time at which the compositor's rendering work for this frame finished. This will be
-         * INVALID if composition was handled by the display and the compositor didn't do any
-         * rendering.
-         */
-        time_point_ns gpuCompositionDoneTime;
-
-        /**
-         * The time at which this frame started to scan out to the physical display.
-         */
-        time_point_ns displayPresentTime;
-
-        /**
-         * The time when the buffer became available for reuse as a buffer the client can target
-         * without blocking. This is generally the point when all read commands of the buffer have
-         * been submitted, but not necessarily completed.
-         */
-        time_point_ns dequeueReadyTime;
-
-        /**
-         * The time at which all reads for the purpose of display/composition were completed for
-         * this frame.
-         */
-        time_point_ns releaseTime;
-    };
-
    /**
     * The type of technique for stereoscopic rendering. (Note that the materials used will need to
     * be compatible with the chosen technique.)
@@ -255,28 +141,6 @@ public:
        REALTIME,
    };

-    /**
-     * Defines how asynchronous operations are handled by the engine.
-     */
-    enum class AsynchronousMode : uint8_t {
-        /**
-         * Asynchronous operations are disabled. This is the default.
-         */
-        NONE,
-
-        /**
-         * Attempts to use a dedicated worker thread for asynchronous tasks. If threading is not
-         * supported by the platform, it automatically falls back to using an amortization strategy.
-         */
-        THREAD_PREFERRED,
-
-        /**
-         * Uses an amortization strategy, processing a small number of asynchronous tasks during
-         * each engine update cycle.
-         */
-        AMORTIZATION,
-    };
-
    struct DriverConfig {
        /**
         * Size of handle arena in bytes. Setting to 0 indicates default value is to be used.
@@ -346,11 +210,6 @@ public:
         *      - VulkanPlatform
         */
        bool vulkanEnableStagingBufferBypass = false;
-
-        /**
-         * Asynchronous mode for the engine. Defines how asynchronous operations are handled.
-         */
-        AsynchronousMode asynchronousMode = AsynchronousMode::NONE;
    };

    Platform() noexcept;
@@ -388,65 +247,6 @@ public:
     */
    virtual bool pumpEvents() noexcept;

-    // --------------------------------------------------------------------------------------------
-    // Swapchain timing APIs
-
-    /**
-     * Whether this platform supports compositor timing querying.
-     *
-     * @return true if this Platform supports compositor timings, false otherwise [default]
-     * @see queryCompositorTiming()
-     * @see setPresentFrameId()
-     * @see queryFrameTimestamps()
-     */
-    virtual bool isCompositorTimingSupported() const noexcept;
-
-    /**
-     * If compositor timing is supported, fills the provided CompositorTiming structure
-     * with timing information form the compositor the swapchain's native window is using.
-     * The swapchain'snative window must be valid (i.e. not a headless swapchain).
-     * @param swapchain to query the compositor timing from
-     * @return true on success, false otherwise (e.g. if not supported)
-     * @see isCompositorTimingSupported()
-     */
-    virtual bool queryCompositorTiming(SwapChain const* UTILS_NONNULL swapchain,
-            CompositorTiming* UTILS_NONNULL outCompositorTiming) const noexcept;
-
-    /**
-     * Associate a generic frameId which must be monotonically increasing (albeit not strictly) with
-     * the next frame to be presented on the specified swapchain.
-     *
-     * This must be called from the backend thread.
-     *
-     * @param swapchain
-     * @param frameId
-     * @return true on success, false otherwise
-     * @see isCompositorTimingSupported()
-     * @see queryFrameTimestamps()
-     */
-    virtual bool setPresentFrameId(SwapChain const* UTILS_NONNULL swapchain,
-            uint64_t frameId) noexcept;
-
-    /**
-     * If compositor timing is supported, fills the provided FrameTimestamps structure
-     * with timing information of a given frame, identified by the frame id, of the specified
-     * swapchain. The system only keeps a limited history of frames timings.
-     *
-     * This API is thread safe and can be called from any thread.
-     *
-     * @param swapchain swapchain to query the timestamps of
-     * @param frameId frame we're interested it
-     * @param outFrameTimestamps output structure receiving the timestamps
-     * @return true if successful, false otherwise
-     * @see isCompositorTimingSupported()
-     * @see setPresentFrameId()
-     */
-    virtual bool queryFrameTimestamps(SwapChain const* UTILS_NONNULL swapchain,
-            uint64_t frameId, FrameTimestamps* UTILS_NONNULL outFrameTimestamps) const noexcept;
-
-    // --------------------------------------------------------------------------------------------
-    // Caching APIs
-
    /**
     * InsertBlobFunc is an Invocable to an application-provided function that a
     * backend implementation may use to insert a key/value pair into the
@@ -539,25 +339,13 @@ public:
    size_t retrieveBlob(const void* UTILS_NONNULL key, size_t keySize,
            void* UTILS_NONNULL value, size_t valueSize);

-    // --------------------------------------------------------------------------------------------
-    // Debugging APIs
-
-    using DebugUpdateStatFunc = utils::Invocable<void(const char* UTILS_NONNULL key,
-            uint64_t intValue, utils::CString stringValue)>;
+    using DebugUpdateStatFunc = utils::Invocable<void(const char* UTILS_NONNULL key, uint64_t value)>;

    /**
     * Sets the callback function that the backend can use to update backend-specific statistics
     * to aid with debugging. This callback is guaranteed to be called on the Filament driver
     * thread.
     *
-     * The callback signature is (key, intValue, stringValue). Note that for any given call,
-     * only one of the value parameters (intValue or stringValue) will be meaningful, depending on
-     * the specific key.
-     *
-     * IMPORTANT_NOTE: because the callback is called on the driver thread, only quick, non-blocking
-     * work should be done inside it. Furthermore, no graphics API calls (such as GL calls) should
-     * be made, which could interfere with Filament's driver state.
-     *
     * @param debugUpdateStat   an Invocable that updates debug statistics
     */
    void setDebugUpdateStatFunc(DebugUpdateStatFunc&& debugUpdateStat) noexcept;
@@ -576,32 +364,15 @@ public:
     * This function is guaranteed to be called only on a single thread, the Filament driver
     * thread.
     *
-     * @param key           a null-terminated C-string with the key of the debug statistic
-     * @param intValue      the updated integer value of key (the string value passed to the
-     *                      callback will be empty)
+     * @param key          a null-terminated C-string with the key of the debug statistic
+     * @param value        the updated value of key
     */
-    void debugUpdateStat(const char* UTILS_NONNULL key, uint64_t intValue);
-
-    /**
-     * To track backend-specific statistics, the backend implementation can call the
-     * application-provided callback function debugUpdateStatFunc to associate or update a value
-     * with a given key. It is possible for this function to be called multiple times with the
-     * same key, in which case newer values should overwrite older values.
-     *
-     * This function is guaranteed to be called only on a single thread, the Filament driver
-     * thread.
-     *
-     * @param key           a null-terminated C-string with the key of the debug statistic
-     * @param stringValue   the updated string value of key (the integer value passed to the
-     *                      callback will be 0)
-     */
-    void debugUpdateStat(const char* UTILS_NONNULL key, utils::CString stringValue);
+    void debugUpdateStat(const char* UTILS_NONNULL key, uint64_t value);

 private:
-    std::shared_ptr<InsertBlobFunc> mInsertBlob;
-    std::shared_ptr<RetrieveBlobFunc> mRetrieveBlob;
-    std::shared_ptr<DebugUpdateStatFunc> mDebugUpdateStat;
-    mutable utils::Mutex mMutex;
+    InsertBlobFunc mInsertBlob;
+    RetrieveBlobFunc mRetrieveBlob;
+    DebugUpdateStatFunc mDebugUpdateStat;
 };

 } // namespace filament
@@ -1,79 +0,0 @@
-/*
- * 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.
- */
-
-#ifndef FILAMENT_BACKEND_ANDROIDNDK_H
-#define FILAMENT_BACKEND_ANDROIDNDK_H
-
-#include <android/native_window.h>
-#include <android/hardware_buffer.h>
-
-#define FILAMENT_REQUIRES_API(x) __attribute__((__availability__(android,introduced=x)))
-
-#define FILAMENT_USE_DLSYM(api) (__ANDROID_API__ < (api))
-
-namespace filament::backend {
-
-class AndroidNdk {
-public:
-    AndroidNdk();
-
-#if FILAMENT_USE_DLSYM(26)
-
-    static void AHardwareBuffer_acquire(
-            AHardwareBuffer* buffer) FILAMENT_REQUIRES_API(26) {
-        ndk.AHardwareBuffer_acquire(buffer);
-    }
-
-    static void AHardwareBuffer_release(
-            AHardwareBuffer* buffer) FILAMENT_REQUIRES_API(26) {
-        ndk.AHardwareBuffer_release(buffer);
-    }
-
-    static void AHardwareBuffer_describe(
-            AHardwareBuffer const* buffer, AHardwareBuffer_Desc* desc) FILAMENT_REQUIRES_API(26) {
-        ndk.AHardwareBuffer_describe(buffer, desc);
-    }
-
-#else
-
-    static void AHardwareBuffer_acquire(
-            AHardwareBuffer* buffer) FILAMENT_REQUIRES_API(26) {
-        ::AHardwareBuffer_acquire(buffer);
-    }
-    static void AHardwareBuffer_release(
-            AHardwareBuffer* buffer) FILAMENT_REQUIRES_API(26) {
-        ::AHardwareBuffer_release(buffer);
-    }
-    static void AHardwareBuffer_describe(
-            AHardwareBuffer const* buffer, AHardwareBuffer_Desc* desc) FILAMENT_REQUIRES_API(26) {
-        ::AHardwareBuffer_describe(buffer, desc);
-    }
-
-#endif
-
-private:
-#if FILAMENT_USE_DLSYM(26)
-    static struct Ndk {
-        void (*AHardwareBuffer_acquire)(AHardwareBuffer*);
-        void (*AHardwareBuffer_release)(AHardwareBuffer*);
-        void (*AHardwareBuffer_describe)(AHardwareBuffer const*, AHardwareBuffer_Desc*);
-    } ndk;
-#endif
-};
-
-} // filament::backend
-
-#endif //FILAMENT_BACKEND_ANDROIDNDK_H
@@ -430,7 +430,7 @@ public:
    virtual bool isExtraContextSupported() const noexcept;

    /**
-     * Creates an OpenGL context with the same configuration as the main context and makes it
+     * Creates an OpenGL context with the same configuration than the main context and makes it
     * current to the current thread. Must not be called from the main driver thread.
     * createContext() is only supported if isExtraContextSupported() returns true.
     * These additional contexts will be automatically terminated in terminate.
@@ -443,7 +443,7 @@ public:

    /**
     * Detach and destroy the current context if any and releases all resources associated to
-     * this thread. This must be called from the same thread where createContext() was called.
+     * this thread.
     */
    virtual void releaseContext() noexcept;
 };
@@ -25,7 +25,6 @@
 #include <EGL/eglext.h>
 #include <EGL/eglplatform.h>

-#include <utils/compiler.h>
 #include <utils/Invocable.h>

 #include <initializer_list>
@@ -101,6 +100,10 @@ protected:
    bool isProtectedContextSupported() const noexcept override;
    bool isSRGBSwapChainSupported() const noexcept override;
    bool isMSAASwapChainSupported(uint32_t samples) const noexcept override;
+
+    SwapChain* createSwapChain(void* nativewindow, uint64_t flags) override;
+    SwapChain* createSwapChain(uint32_t width, uint32_t height, uint64_t flags) override;
+    void destroySwapChain(SwapChain* swapChain) noexcept override;
    bool isSwapChainProtected(SwapChain* swapChain) noexcept override;

    ContextType getCurrentContextType() const noexcept override;
@@ -155,9 +158,17 @@ protected:
        return egl.makeCurrent(context, mEGLDummySurface, mEGLDummySurface);
    }

-    EGLDisplay getEglDisplay() const noexcept { return mEGLDisplay; }
-    EGLConfig getEglConfig() const noexcept { return mEGLConfig; }
-    EGLConfig getSuitableConfigForSwapChain(uint64_t flags, bool window, bool pbuffer) const;
+    // TODO: this should probably use getters instead.
+    EGLDisplay mEGLDisplay = EGL_NO_DISPLAY;
+    EGLContext mEGLContext = EGL_NO_CONTEXT;
+    EGLContext mEGLContextProtected = EGL_NO_CONTEXT;
+    EGLSurface mEGLDummySurface = EGL_NO_SURFACE;
+    ContextType mCurrentContextType = ContextType::NONE;
+    // mEGLConfig is valid only if ext.egl.KHR_no_config_context is false
+    EGLConfig mEGLConfig = EGL_NO_CONFIG_KHR;
+    Config mContextAttribs;
+    std::vector<EGLContext> mAdditionalContexts;
+    bool mMSAA4XSupport = false;

    // supported extensions detected at runtime
    struct {
@@ -174,11 +185,7 @@ protected:
        } egl;
    } ext;

-    struct SwapChainEGL : public SwapChain {
-        SwapChainEGL(PlatformEGL const& platform, void* nativeWindow, uint64_t flags);
-        SwapChainEGL(PlatformEGL const& platform, uint32_t width, uint32_t height, uint64_t flags);
-        void terminate(PlatformEGL& platform);
-
+    struct SwapChainEGL : public Platform::SwapChain {
        EGLSurface sur = EGL_NO_SURFACE;
        Config attribs{};
        EGLNativeWindowType nativeWindow{};
@@ -194,25 +201,10 @@ protected:
        ~ExternalImageEGL() override;
    };

-private:
-    // prevent derived classes' implementations to call through
-    [[nodiscard]] SwapChain* createSwapChain(void* nativeWindow, uint64_t flags) override;
-    [[nodiscard]] SwapChain* createSwapChain(uint32_t width, uint32_t height, uint64_t flags) override;
-    void destroySwapChain(SwapChain* swapChain) noexcept override;
-
+protected:
    EGLConfig findSwapChainConfig(uint64_t flags, bool window, bool pbuffer) const;

-    EGLDisplay mEGLDisplay = EGL_NO_DISPLAY;
-    EGLContext mEGLContext = EGL_NO_CONTEXT;
-    EGLContext mEGLContextProtected = EGL_NO_CONTEXT;
-    EGLSurface mEGLDummySurface = EGL_NO_SURFACE;
-    ContextType mCurrentContextType = ContextType::NONE;
-    // mEGLConfig is valid only if ext.egl.KHR_no_config_context is false
-    EGLConfig mEGLConfig = EGL_NO_CONFIG_KHR;
-    Config mContextAttribs;
-    std::vector<EGLContext> mAdditionalContexts;
-    bool mMSAA4XSupport = false;
-
+private:
    class EGL {
        EGLDisplay& mEGLDisplay;
        EGLSurface mCurrentDrawSurface = EGL_NO_SURFACE;
@@ -17,10 +17,7 @@
 #ifndef TNT_FILAMENT_BACKEND_OPENGL_OPENGL_PLATFORM_EGL_ANDROID_H
 #define TNT_FILAMENT_BACKEND_OPENGL_OPENGL_PLATFORM_EGL_ANDROID_H

-#include "AndroidNdk.h"
-
 #include <backend/AcquiredImage.h>
-#include <backend/DriverEnums.h>
 #include <backend/Platform.h>
 #include <backend/platforms/OpenGLPlatform.h>
 #include <backend/platforms/PlatformEGL.h>
@@ -28,8 +25,6 @@
 #include <utils/android/PerformanceHintManager.h>
 #include <utils/compiler.h>

-#include <math/mat3.h>
-
 #include <chrono>

 #include <stddef.h>
@@ -43,7 +38,7 @@ class ExternalStreamManagerAndroid;
 * A concrete implementation of OpenGLPlatform and subclass of PlatformEGL that supports
 * EGL on Android. It adds Android streaming functionality to PlatformEGL.
 */
-class PlatformEGLAndroid : public PlatformEGL, public AndroidNdk {
+class PlatformEGLAndroid : public PlatformEGL {
 public:

    PlatformEGLAndroid() noexcept;
@@ -72,17 +67,9 @@ public:
     * @return `true` on success, `false` on failure. The default implementation
     *         returns `false`.
     */
-    bool convertSyncToFd(Sync* sync, int* fd) noexcept;
+    bool convertSyncToFd(Platform::Sync* sync, int* fd) noexcept;

 protected:
-    struct {
-        struct {
-            bool ANDROID_presentation_time = false;
-            bool ANDROID_get_frame_timestamps = false;
-            bool ANDROID_native_fence_sync = false;
-        } egl;
-    } ext;
-
    // --------------------------------------------------------------------------------------------
    // Platform Interface

@@ -93,22 +80,12 @@ protected:
    int getOSVersion() const noexcept override;

    Driver* createDriver(void* sharedContext,
-            const DriverConfig& driverConfig) override;
-
-    bool isCompositorTimingSupported() const noexcept override;
-
-    bool queryCompositorTiming(SwapChain const* swapchain,
-            CompositorTiming* outCompositorTiming) const noexcept override;
-
-    bool setPresentFrameId(SwapChain const* swapchain, uint64_t frameId) noexcept override;
-
-    bool queryFrameTimestamps(SwapChain const* swapchain, uint64_t frameId,
-            FrameTimestamps* outFrameTimestamps) const noexcept override;
+            const Platform::DriverConfig& driverConfig) override;

    // --------------------------------------------------------------------------------------------
    // OpenGLPlatform Interface

-    struct SyncEGLAndroid : public Sync {
+    struct SyncEGLAndroid : public Platform::Sync {
        EGLSyncKHR sync;
    };

@@ -129,8 +106,8 @@ protected:

    Stream* createStream(void* nativeStream) noexcept override;
    void destroyStream(Stream* stream) noexcept override;
-    Sync* createSync() noexcept override;
-    void destroySync(Sync* sync) noexcept override;
+    Platform::Sync* createSync() noexcept override;
+    void destroySync(Platform::Sync* sync) noexcept override;
    void attach(Stream* stream, intptr_t tname) noexcept override;
    void detach(Stream* stream) noexcept override;
    void updateTexImage(Stream* stream, int64_t* timestamp) noexcept override;
@@ -143,7 +120,7 @@ protected:
     */
    AcquiredImage transformAcquiredImage(AcquiredImage source) noexcept override;

-    ExternalTexture* createExternalImageTexture() noexcept override;
+    OpenGLPlatform::ExternalTexture* createExternalImageTexture() noexcept override;
    void destroyExternalImageTexture(ExternalTexture* texture) noexcept override;

    struct ExternalImageEGLAndroid : public ExternalImageEGL {
@@ -163,23 +140,12 @@ protected:
    bool setImage(ExternalImageEGLAndroid const* eglExternalImage,
            ExternalTexture* texture) noexcept;

+protected:
    bool makeCurrent(ContextType type,
            SwapChain* drawSwapChain,
            SwapChain* readSwapChain) override;

 private:
-    struct SwapChainEGLAndroid;
-    struct AndroidDetails;
-
-    // prevent derived classes' implementations to call through
-    [[nodiscard]] SwapChain* createSwapChain(void* nativeWindow, uint64_t flags) override;
-    [[nodiscard]] SwapChain* createSwapChain(uint32_t width, uint32_t height, uint64_t flags) override;
-    void destroySwapChain(SwapChain* swapChain) noexcept override;
-
-    bool isProducerThrottlingControlSupported() const;
-
-    int32_t setProducerThrottlingEnabled(EGLNativeWindowType nativeWindow, bool enabled) const;
-
    struct InitializeJvmForPerformanceManagerIfNeeded {
        InitializeJvmForPerformanceManagerIfNeeded();
    };
@@ -190,13 +156,15 @@ private:

    int mOSVersion;
    ExternalStreamManagerAndroid& mExternalStreamManager;
-    AndroidDetails& mAndroidDetails;
    InitializeJvmForPerformanceManagerIfNeeded const mInitializeJvmForPerformanceManagerIfNeeded;
    utils::PerformanceHintManager mPerformanceHintManager;
    utils::PerformanceHintManager::Session mPerformanceHintSession;
+
    using clock = std::chrono::high_resolution_clock;
    clock::time_point mStartTimeOfActualWork;
-    SwapChainEGLAndroid* mCurrentDrawSwapChain{};
+
+    void* mNativeWindowLib = nullptr;
+    int32_t (*ANativeWindow_getBuffersDefaultDataSpace)(ANativeWindow* window) = nullptr;
    bool mAssertNativeWindowIsValid = false;
 };

@@ -26,10 +26,7 @@

 #include <backend/DriverEnums.h>

-#include <shared_mutex>
-#include <thread>
 #include <vector>
-#include <unordered_map>

 namespace filament::backend {

@@ -51,10 +48,6 @@ protected:

    void terminate() noexcept override;

-    bool isExtraContextSupported() const noexcept override;
-    void createContext(bool shared) override;
-    void releaseContext() noexcept override;
-
    SwapChain* createSwapChain(void* nativewindow, uint64_t flags) noexcept override;
    SwapChain* createSwapChain(uint32_t width, uint32_t height, uint64_t flags) noexcept override;
    void destroySwapChain(SwapChain* swapChain) noexcept override;
@@ -67,10 +60,6 @@ private:
    GLXFBConfig mGLXConfig{};
    GLXPbuffer mDummySurface;
    std::vector<GLXPbuffer> mPBuffers;
-
-    // Variables for shared contexts
-    std::unordered_map<std::thread::id, GLXContext> mAdditionalContexts;
-    std::shared_mutex mAdditionalContextsLock;
 };

 } // namespace filament::backend
@@ -437,19 +437,22 @@ protected:
        std::shared_ptr<VulkanCmdFence> fenceStatus;
    };

+    virtual ExtensionSet getSwapchainInstanceExtensions() const;
+
    using SurfaceBundle = std::tuple<VkSurfaceKHR, VkExtent2D>;
-    virtual ExtensionSet getSwapchainInstanceExtensions() const = 0;
    virtual SurfaceBundle createVkSurfaceKHR(void* nativeWindow, VkInstance instance,
-            uint64_t flags) const noexcept = 0;
+            uint64_t flags) const noexcept;

    virtual VkExternalFenceHandleTypeFlagBits getFenceExportFlags() const noexcept;

-    /**
-     * Query if transient attachments are supported by the backend.
-     */
-    bool isTransientAttachmentSupported() const noexcept;
-
 private:
+    // Platform dependent helper methods
+    static ExtensionSet getSwapchainInstanceExtensionsImpl();
+
+    // Platform dependent helper methods
+    static SurfaceBundle createVkSurfaceKHRImpl(void* nativeWindow, VkInstance instance,
+            uint64_t flags) noexcept;
+
    friend struct VulkanPlatformPrivate;
 };

@@ -17,18 +17,14 @@
 #ifndef TNT_FILAMENT_BACKEND_PLATFORMS_VULKAN_PLATFORM_ANDROID_H
 #define TNT_FILAMENT_BACKEND_PLATFORMS_VULKAN_PLATFORM_ANDROID_H

-#include "AndroidNdk.h"
-
 #include <backend/DriverEnums.h>
 #include <backend/platforms/VulkanPlatform.h>

-#include <utils/compiler.h>
-
 #include <android/hardware_buffer.h>

 namespace filament::backend {

-class VulkanPlatformAndroid : public VulkanPlatform, public AndroidNdk {
+class VulkanPlatformAndroid : public VulkanPlatform {
 public:
    ExternalImageHandle UTILS_PUBLIC createExternalImage(AHardwareBuffer const* buffer,
            bool sRGB) noexcept;
@@ -40,17 +36,13 @@ public:
        TextureUsage usage;  // Texture usage flags
    };

-    VulkanPlatformAndroid();
-
-    ~VulkanPlatformAndroid() noexcept override;
-
    ExternalImageDescAndroid UTILS_PUBLIC getExternalImageDesc(
            ExternalImageHandleRef externalImage) const noexcept;

-    ExternalImageMetadata extractExternalImageMetadata(
+    virtual ExternalImageMetadata extractExternalImageMetadata(
            ExternalImageHandleRef image) const override;

-    ImageData createVkImageFromExternal(ExternalImageHandleRef image) const override;
+    virtual ImageData createVkImageFromExternal(ExternalImageHandleRef image) const override;

    /**
     * Converts a sync to an external file descriptor, if possible. Accepts an
@@ -61,49 +53,25 @@ public:
     * @return `true` on success, `false` on failure. The default implementation
     *         returns `false`.
     */
-    bool convertSyncToFd(Sync* sync, int* fd) const noexcept;
-
-    int getOSVersion() const noexcept override;
-
-    void terminate() override;
-
-    Driver* createDriver(void* sharedContext,
-        DriverConfig const& driverConfig) override;
-
-
-    bool isCompositorTimingSupported() const noexcept override;
-
-    bool queryCompositorTiming(SwapChain const* swapchain,
-            CompositorTiming* outCompositorTiming) const noexcept override;
-
-    bool setPresentFrameId(SwapChain const* swapchain, uint64_t frameId) noexcept override;
-
-    bool queryFrameTimestamps(SwapChain const* swapchain, uint64_t frameId,
-            FrameTimestamps* outFrameTimestamps) const noexcept override;
-
+    bool convertSyncToFd(Platform::Sync* sync, int* fd) const noexcept;

 protected:
-    ExtensionSet getSwapchainInstanceExtensions() const override;
+    virtual ExtensionSet getSwapchainInstanceExtensions() const override;

-    using SurfaceBundle = SurfaceBundle;
-    SurfaceBundle createVkSurfaceKHR(void* nativeWindow, VkInstance instance,
+    using SurfaceBundle = VulkanPlatform::SurfaceBundle;
+    virtual SurfaceBundle createVkSurfaceKHR(void* nativeWindow, VkInstance instance,
            uint64_t flags) const noexcept override;

-    VkExternalFenceHandleTypeFlagBits getFenceExportFlags() const noexcept override;
+    virtual VkExternalFenceHandleTypeFlagBits getFenceExportFlags() const noexcept override;

 private:
-    struct AndroidDetails;
-
-    struct ExternalImageVulkanAndroid : public ExternalImage {
+    struct ExternalImageVulkanAndroid : public Platform::ExternalImage {
        AHardwareBuffer* aHardwareBuffer = nullptr;
        bool sRGB = false;

    protected:
        ~ExternalImageVulkanAndroid() override;
    };
-
-    AndroidDetails& mAndroidDetails;
-    int mOSVersion{};
 };

 }// namespace filament::backend
@@ -1,33 +0,0 @@
-/*
- * 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.
- */
-
-#ifndef TNT_FILAMENT_BACKEND_PLATFORMS_VULKANPLATFORMAPPLE_H
-#define TNT_FILAMENT_BACKEND_PLATFORMS_VULKANPLATFORMAPPLE_H
-
-#include <backend/platforms/VulkanPlatform.h>
-
-namespace filament::backend {
-
-class VulkanPlatformApple : public VulkanPlatform {
-protected:
-    ExtensionSet getSwapchainInstanceExtensions() const override;
-    SurfaceBundle createVkSurfaceKHR(void* nativeWindow, VkInstance instance,
-            uint64_t flags) const noexcept override;
-};
-
-} // namespace filament::backend
-
-#endif // TNT_FILAMENT_BACKEND_PLATFORMS_VULKANPLATFORMAPPLE_H
@@ -1,33 +0,0 @@
-/*
- * 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.
- */
-
-#ifndef TNT_FILAMENT_BACKEND_PLATFORMS_VULKANPLATFORMLINUX_H
-#define TNT_FILAMENT_BACKEND_PLATFORMS_VULKANPLATFORMLINUX_H
-
-#include <backend/platforms/VulkanPlatform.h>
-
-namespace filament::backend {
-
-class VulkanPlatformLinux : public VulkanPlatform {
-protected:
-    ExtensionSet getSwapchainInstanceExtensions() const override;
-    SurfaceBundle createVkSurfaceKHR(void* nativeWindow, VkInstance instance,
-            uint64_t flags) const noexcept override;
-};
-
-} // namespace filament::backend
-
-#endif // TNT_FILAMENT_BACKEND_PLATFORMS_VULKANPLATFORMLINUX_H
@@ -1,33 +0,0 @@
-/*
- * Copyright (C) 2023 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.
- */
-
-#ifndef TNT_FILAMENT_BACKEND_PLATFORMS_VULKANPLATFORMWINDOWS_H
-#define TNT_FILAMENT_BACKEND_PLATFORMS_VULKANPLATFORMWINDOWS_H
-
-#include <backend/platforms/VulkanPlatform.h>
-
-namespace filament::backend {
-
-class VulkanPlatformWindows : public VulkanPlatform {
-protected:
-    ExtensionSet getSwapchainInstanceExtensions() const override;
-    SurfaceBundle createVkSurfaceKHR(void* nativeWindow, VkInstance instance,
-            uint64_t flags) const noexcept override;
-};
-
-} // namespace filament::backend
-
-#endif // TNT_FILAMENT_BACKEND_PLATFORMS_VULKANPLATFORMWINDOWS_H
@@ -22,6 +22,7 @@
 #include "private/backend/Driver.h"

 #include <backend/BufferDescriptor.h>
+#include <backend/BufferObjectStreamDescriptor.h>
 #include <backend/CallbackHandler.h>
 #include <backend/DriverEnums.h>
 #include <backend/Handle.h>
@@ -51,6 +51,7 @@
 namespace filament::backend {

 class BufferDescriptor;
+class BufferObjectStreamDescriptor;
 class CallbackHandler;
 class PixelBufferDescriptor;
 class Program;
@@ -337,7 +337,6 @@ DECL_DRIVER_API_SYNCHRONOUS_N(int64_t, getStreamTimestamp, backend::StreamHandle
 DECL_DRIVER_API_SYNCHRONOUS_N(void, updateStreams, backend::DriverApi*, driver)
 DECL_DRIVER_API_SYNCHRONOUS_N(backend::FenceStatus, getFenceStatus, backend::FenceHandle, fh)
 DECL_DRIVER_API_SYNCHRONOUS_N(backend::FenceStatus, fenceWait, backend::FenceHandle, fh, uint64_t, timeout)
-DECL_DRIVER_API_SYNCHRONOUS_N(void, fenceCancel, backend::FenceHandle, fh)
 DECL_DRIVER_API_SYNCHRONOUS_N(void, getPlatformSync, backend::SyncHandle, sh,
        backend::CallbackHandler*, handler, backend::Platform::SyncCallback, cb, void*, userData)
 DECL_DRIVER_API_SYNCHRONOUS_N(bool, isTextureFormatSupported, backend::TextureFormat, format)
@@ -367,10 +366,6 @@ DECL_DRIVER_API_SYNCHRONOUS_N(void, setupExternalImage, void*, image)
 DECL_DRIVER_API_SYNCHRONOUS_N(backend::TimerQueryResult, getTimerQueryValue, backend::TimerQueryHandle, tqh, uint64_t*, elapsedTime)
 DECL_DRIVER_API_SYNCHRONOUS_N(bool, isWorkaroundNeeded, backend::Workaround, workaround)
 DECL_DRIVER_API_SYNCHRONOUS_0(backend::FeatureLevel, getFeatureLevel)
-DECL_DRIVER_API_SYNCHRONOUS_0(size_t, getUniformBufferOffsetAlignment)
-DECL_DRIVER_API_SYNCHRONOUS_0(bool, isCompositorTimingSupported)
-DECL_DRIVER_API_SYNCHRONOUS_N(bool, queryFrameTimestamps, backend::SwapChainHandle, swapChain, uint64_t, frameId, backend::FrameTimestamps*, outFrameTimestamps)
-DECL_DRIVER_API_SYNCHRONOUS_N(bool, queryCompositorTiming, backend::SwapChainHandle, swapChain, backend::CompositorTiming*, outCompositorTiming)

 /*
 * Updating driver objects
@@ -392,6 +387,10 @@ DECL_DRIVER_API_N(updateBufferObject,
        backend::BufferDescriptor&&, data,
        uint32_t, byteOffset)

+DECL_DRIVER_API_N(registerBufferObjectStreams,
+        backend::BufferObjectHandle, boh,
+        backend::BufferObjectStreamDescriptor&&, streams)
+
 DECL_DRIVER_API_N(updateBufferObjectUnsynchronized,
        backend::BufferObjectHandle, boh,
        backend::BufferDescriptor&&, data,
@@ -169,11 +169,10 @@ public:
     * Destroy the object D at Handle<B> and frees Handle<B>
     * e.g.:
     *      Handle<HwTexture> h = ...;
-     *      deallocate<GLTexture>(h);
+     *      deallocate(h);
     */
-    template<typename D, typename B,
-            typename = std::enable_if_t<std::is_base_of_v<B, D>, D>>
-    void deallocate(Handle<B>& handle) noexcept {
+    template<typename D>
+    void deallocate(Handle<D>& handle) noexcept {
        D const* d = handle_cast<const D*>(handle);
        deallocate(handle, d);
    }
@@ -209,7 +208,7 @@ public:
                HandleBase::HandleId const index = (handle.getId() & HANDLE_INDEX_MASK);
                // if we've already handed out this handle index before, it's definitely a
                // use-after-free, otherwise it's probably just a corrupted handle
-                if (index < mId.load(std::memory_order_relaxed)) {
+                if (index < mId) {
                    FILAMENT_CHECK_POSTCONDITION(p != nullptr)
                            << "use-after-free of heap Handle with id=" << handle.getId()
                            << ", tag=" << getHandleTag(handle.getId()).c_str_safe();
@@ -1,139 +0,0 @@
-/*
- * 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.
- */
-
-#include "AndroidFrameCallback.h"
-
-#include <android/choreographer.h>
-#include <android/looper.h>
-
-#include <private/utils/Tracing.h>
-
-#include <utils/Panic.h>
-#include <utils/debug.h>
-#include <utils/JobSystem.h>
-
-#include <atomic>
-#include <cstddef>
-#include <cstdint>
-#include <mutex>
-
-namespace filament::backend {
-
-using namespace utils;
-
-AndroidFrameCallback::AndroidFrameCallback() = default;
-
-AndroidFrameCallback::~AndroidFrameCallback() noexcept {
-    assert_invariant(!mLooperThread.joinable());
-    assert_invariant(mLooper == nullptr);
-}
-
-void AndroidFrameCallback::init() {
-    if (__builtin_available(android 33, *)) {
-        FILAMENT_CHECK_PRECONDITION(!mLooperThread.joinable()) << "init() already called";
-
-        // start the looper thread for our choreographer callbacks
-        mLooperThread = std::thread([this] {
-            // create the looper for this thread
-            mLooper = ALooper_prepare(0);
-            // acquire a reference, so we can use it from our main thread
-            ALooper_acquire(mLooper);
-            // set thread name
-            JobSystem::setThreadName("Filament Choreographer");
-            // set priority
-            JobSystem::setThreadPriority(JobSystem::Priority::DISPLAY);
-            // start the choreographer callbacks
-            if (__builtin_available(android 33, *)) {
-                mChoreographer = AChoreographer_getInstance();
-                // request our first callback for the next frame
-                AChoreographer_postVsyncCallback(mChoreographer, &vsyncCallback, this);
-            }
-            // signal we're ready to run and choreographer and looper are initialized
-            mInitBarrier.latch();
-            // our main loop just sits there to handle events
-            while (true) {
-                int const result = ALooper_pollOnce(-1, nullptr, nullptr, nullptr);
-                if (result == ALOOPER_POLL_ERROR || mExitRequested.
-                    load(std::memory_order_relaxed)) {
-                    return; // exit the loop
-                }
-            }
-        });
-
-        // wait for the thread and looper to be created and ready to run
-        mInitBarrier.await();
-    }
-}
-
-void AndroidFrameCallback::terminate() {
-    if (__builtin_available(android 33, *)) {
-        // the thread wouldn't be joinable if terminate() is called twice, or init() is not called.
-        if (mLooperThread.joinable()) {
-            // request exit
-            mExitRequested.store(true, std::memory_order_relaxed);
-            // wake the looper right away
-            ALooper_wake(mLooper);
-            // release our reference to the looper
-            ALooper_release(mLooper);
-            mLooper = nullptr;
-            // and make sure to wait for the thread to terminate
-            mLooperThread.join();
-        }
-    }
-}
-
-bool AndroidFrameCallback::isSupported() noexcept {
-    if (__builtin_available(android 33, *)) {
-        return true;
-    }
-    return false;
-}
-
-AndroidFrameCallback::Timeline AndroidFrameCallback::getPreferredTimeline() const noexcept {
-    std::lock_guard const l(mLock);
-    return mPreferredTimeline;
-}
-
-void AndroidFrameCallback::vsyncCallback(const AChoreographerFrameCallbackData* callbackData) {
-    if (__builtin_available(android 33, *)) {
-        FILAMENT_TRACING_CALL(FILAMENT_TRACING_CATEGORY_FILAMENT);
-
-        // request the next frame callback
-        AChoreographer_postVsyncCallback(mChoreographer, &vsyncCallback, this);
-
-        int64_t const frameTime = AChoreographerFrameCallbackData_getFrameTimeNanos(callbackData);
-
-        size_t const preferredIndex =
-                AChoreographerFrameCallbackData_getPreferredFrameTimelineIndex(callbackData);
-
-        int64_t const expectedPresentTime =
-                AChoreographerFrameCallbackData_getFrameTimelineExpectedPresentationTimeNanos(
-                        callbackData, preferredIndex);
-
-        int64_t const frameTimelineDeadline =
-                AChoreographerFrameCallbackData_getFrameTimelineDeadlineNanos(
-                        callbackData, preferredIndex);
-
-        std::lock_guard const l(mLock);
-        mPreferredTimeline = {
-            .frameTime = frameTime,
-            .expectedPresentTime = expectedPresentTime,
-            .frameTimelineDeadline = frameTimelineDeadline
-        };
-    }
-}
-
-}
@@ -1,82 +0,0 @@
-/*
- * 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.
- */
-
-#ifndef TNT_FILAMENT_BACKEND_ANDROIDFRAMECALLBACK_H
-#define TNT_FILAMENT_BACKEND_ANDROIDFRAMECALLBACK_H
-
-#include <android/choreographer.h>
-#include <android/looper.h>
-
-#include <utils/CountDownLatch.h>
-
-#include <atomic>
-#include <cstdint>
-#include <mutex>
-#include <thread>
-
-namespace filament::backend {
-
-/*
- * AndroidFrameCallback uses a dedicated thread running a Looper and uses
- * Choreographer to receive the FrameCallbackData.
- *
- */
-class AndroidFrameCallback {
-public:
-    struct Timeline {
-        using timepoint_ns = int64_t;
-        static constexpr timepoint_ns INVALID = -1;
-        timepoint_ns frameTime{ INVALID };
-        timepoint_ns expectedPresentTime{ INVALID };
-        timepoint_ns frameTimelineDeadline{ INVALID };
-    };
-
-    AndroidFrameCallback();
-
-    ~AndroidFrameCallback() noexcept;
-
-    AndroidFrameCallback(AndroidFrameCallback const&) = delete;
-    AndroidFrameCallback& operator=(AndroidFrameCallback const&) = delete;
-
-    void init();
-    void terminate();
-
-    static  bool isSupported() noexcept;
-
-    Timeline getPreferredTimeline() const noexcept;
-
-private:
-    // looper
-    std::thread mLooperThread;
-    mutable utils::CountDownLatch mInitBarrier{ 1 };
-    ALooper* mLooper = nullptr;
-    std::atomic_bool mExitRequested{ false };
-
-    // choreographer
-    AChoreographer* mChoreographer{};
-
-    void vsyncCallback(const AChoreographerFrameCallbackData* callbackData);
-    static void vsyncCallback(const AChoreographerFrameCallbackData* callbackData, void* data) {
-        static_cast<AndroidFrameCallback*>(data)->vsyncCallback(callbackData);
-    }
-
-    mutable std::mutex mLock;
-    Timeline mPreferredTimeline{};
-};
-
-} // namespace filament::backend
-
-#endif //TNT_FILAMENT_BACKEND_ANDROIDFRAMECALLBACK_H
@@ -1,141 +0,0 @@
-/*
- * 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.
- */
-
-#include "AndroidNativeWindow.h"
-
-#include <android/api-level.h>
-#include <android/native_window.h>
-
-#include <utils/compiler.h>
-#include <utils/Logger.h>
-
-#include <cstdint>
-#include <cerrno>
-#include <utility>
-
-#include <dlfcn.h>
-
-namespace filament::backend {
-
-std::pair<int, bool> NativeWindow::isValid(ANativeWindow* const anw) noexcept {
-#if __ANDROID_API__ >= 26
-    // libnativewindow.so is not available before API level 26, this means we can't call
-    // any method above 25 (even protected by __builtin_available()).
-    if (__builtin_available(android 28, *)) {
-        // this a proxy for is_valid()
-        auto const result = ANativeWindow_getBuffersDataSpace(anw);
-        return { result, result >= 0 };
-    }
-#endif
-
-    // fallback on using private APIs
-    NativeWindow const* pWindow = reinterpret_cast<NativeWindow const*>(anw);
-    if (UTILS_LIKELY(pWindow->query)) {
-        int isValid = 0;
-        int const err = pWindow->query(anw, IS_VALID, &isValid);
-        return { err, bool(isValid) };
-    }
-    return { -EINVAL, false };
-}
-
-int NativeWindow::getNextFrameId(ANativeWindow* anw, uint64_t* frameId) {
-    NativeWindow const* pWindow = reinterpret_cast<NativeWindow const*>(anw);
-    return pWindow->perform(anw, GET_NEXT_FRAME_ID, frameId);
-}
-
-int NativeWindow::enableFrameTimestamps(ANativeWindow* anw, bool enable) {
-    NativeWindow const* pWindow = reinterpret_cast<NativeWindow const*>(anw);
-    return pWindow->perform(anw, ENABLE_FRAME_TIMESTAMPS, enable);
-}
-
-int NativeWindow::frameTimestampsSupportsPresent(ANativeWindow* anw, bool* outSupportsPresent) {
-    NativeWindow const* pWindow = reinterpret_cast<NativeWindow const*>(anw);
-    int value = 0;
-    bool const success = pWindow->perform(anw, FRAME_TIMESTAMPS_SUPPORTS_PRESENT, &value);
-    if (success) {
-        *outSupportsPresent = bool(value);
-    }
-    return success;
-}
-
-int NativeWindow::getCompositorTiming(ANativeWindow* anw,
-        int64_t* compositeDeadline, int64_t* compositeInterval,
-        int64_t* compositeToPresentLatency) {
-    NativeWindow const* pWindow = reinterpret_cast<NativeWindow const*>(anw);
-    return pWindow->perform(anw, GET_COMPOSITOR_TIMING,
-            compositeDeadline, compositeInterval, compositeToPresentLatency);
-}
-
-int NativeWindow::getFrameTimestamps(ANativeWindow* anw,
-        uint64_t frameId,
-        int64_t* outRequestedPresentTime, int64_t* outAcquireTime,
-        int64_t* outLatchTime, int64_t* outFirstRefreshStartTime,
-        int64_t* outLastRefreshStartTime, int64_t* outGpuCompositionDoneTime,
-        int64_t* outDisplayPresentTime, int64_t* outDequeueReadyTime,
-        int64_t* outReleaseTime) {
-    NativeWindow const* pWindow = reinterpret_cast<NativeWindow const*>(anw);
-    return pWindow->perform(anw, GET_FRAME_TIMESTAMPS,
-            frameId, outRequestedPresentTime, outAcquireTime, outLatchTime,
-            outFirstRefreshStartTime, outLastRefreshStartTime,
-            outGpuCompositionDoneTime, outDisplayPresentTime,
-            outDequeueReadyTime, outReleaseTime);
-}
-
-AndroidProducerThrottling::AndroidProducerThrottling() {
-    // note: we don't need to dlclose() mNativeWindowLib here, because the library will be cleaned
-    // when the process ends and dlopen() are ref-counted. dlclose() NDK documentation documents
-    // not to call dlclose().
-
-    // libnativewindow.so is not available before API level 26, this means we can't call
-    // any method above 25 (even protected by __builtin_available()).
-
-    void* nativeWindowLibHandle = dlopen("libnativewindow.so", RTLD_LOCAL | RTLD_NOW);
-    if (nativeWindowLibHandle) {
-        mSetProducerThrottlingEnabled =
-                (int32_t(*)(ANativeWindow*, bool)) dlsym(nativeWindowLibHandle,
-                        "ANativeWindow_setProducerThrottlingEnabled");
-
-        mIsProducerThrottlingEnabled =
-                (int32_t(*)(ANativeWindow*, bool*)) dlsym(nativeWindowLibHandle,
-                        "ANativeWindow_isProducerThrottlingEnabled");
-
-        if (mSetProducerThrottlingEnabled && mIsProducerThrottlingEnabled) {
-            LOG(INFO) << "Producer Throttling API available";
-        }
-    }
-}
-
-int32_t AndroidProducerThrottling::setProducerThrottlingEnabled(
-        ANativeWindow* window, bool enabled) const {
-    if (mSetProducerThrottlingEnabled) {
-        return mSetProducerThrottlingEnabled(window, enabled);
-    }
-    return -1;
-}
-
-int32_t AndroidProducerThrottling::isProducerThrottlingEnabled(
-        ANativeWindow* window, bool* outEnabled) const {
-    if (mIsProducerThrottlingEnabled) {
-        return mIsProducerThrottlingEnabled(window, outEnabled);
-    }
-    return -1;
-}
-
-bool AndroidProducerThrottling::isSupported() const noexcept {
-    return mSetProducerThrottlingEnabled && mIsProducerThrottlingEnabled;
-}
-
-} // namespace filament::backend
@@ -1,81 +0,0 @@
-/*
- * 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.
- */
-
-#ifndef FILAMENT_BACKEND_ANDROIDNATIVEWINDOW_H
-#define FILAMENT_BACKEND_ANDROIDNATIVEWINDOW_H
-
-#include <android/native_window.h>
-
-#include <cstdint>
-#include <utility>
-
-namespace filament::backend {
-
-struct NativeWindow {
-    // this class can't be instantiated. It's used by casting ANativeWindow* to it.
-    NativeWindow() noexcept = delete;
-    ~NativeWindow() noexcept = delete;
-
-    // is valid query enum value
-    enum {
-        IS_VALID                = 17,
-        FRAME_TIMESTAMPS_SUPPORTS_PRESENT = 18,
-        GET_NEXT_FRAME_ID       = 24,
-        ENABLE_FRAME_TIMESTAMPS = 25,
-        GET_COMPOSITOR_TIMING   = 26,
-        GET_FRAME_TIMESTAMPS    = 27,
-    };
-
-#if defined(__LP64__)
-    uint64_t pad[18];
-#else
-    uint32_t pad[21];
-#endif
-    int (*query)(ANativeWindow const*, int, int*);
-    int (*perform)(ANativeWindow*, int, ...);
-
-    // return whether the ANativeWindow is valid
-    static std::pair<int, bool> isValid(ANativeWindow* anw) noexcept;
-
-    static int getNextFrameId(ANativeWindow* anw, uint64_t* frameId);
-    static int enableFrameTimestamps(ANativeWindow* anw, bool enable);
-    static int frameTimestampsSupportsPresent(ANativeWindow* anw, bool* outSupportsPresent);
-    static int getCompositorTiming(ANativeWindow* anw,
-            int64_t* compositeDeadline, int64_t* compositeInterval,
-            int64_t* compositeToPresentLatency);
-    static int getFrameTimestamps(ANativeWindow* anw,
-            uint64_t frameId,
-            int64_t* outRequestedPresentTime, int64_t* outAcquireTime,
-            int64_t* outLatchTime, int64_t* outFirstRefreshStartTime,
-            int64_t* outLastRefreshStartTime, int64_t* outGpuCompositionDoneTime,
-            int64_t* outDisplayPresentTime, int64_t* outDequeueReadyTime,
-            int64_t* outReleaseTime);
-};
-
-struct AndroidProducerThrottling {
-    AndroidProducerThrottling();
-    int32_t setProducerThrottlingEnabled(ANativeWindow* window, bool enabled) const;
-    int32_t isProducerThrottlingEnabled(ANativeWindow* window, bool* outEnabled) const;
-    bool isSupported() const noexcept;
-private:
-    int32_t (*mSetProducerThrottlingEnabled)(ANativeWindow* window, bool enabled) = nullptr;
-    int32_t (*mIsProducerThrottlingEnabled)(ANativeWindow* window, bool* outEnabled) = nullptr;
-};
-
-
-} // namespace filament::backend
-
-#endif //FILAMENT_BACKEND_ANDROIDNATIVEWINDOW_H
@@ -1,60 +0,0 @@
-/*
- * 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.
- */
-
-#include <backend/platforms/AndroidNdk.h>
-
-#include <android/hardware_buffer.h>
-
-#include <utils/compiler.h>
-
-#include <mutex>
-
-#include <dlfcn.h>
-
-namespace filament::backend {
-
-UTILS_UNUSED
-static std::once_flag sInitOnce{};
-
-template <typename T>
-UTILS_UNUSED
-static void loadSymbol(void* handle, const char* symbol, T& pfn) {
-    pfn = T(dlsym(handle, symbol));
-}
-
-#if FILAMENT_USE_DLSYM(26)
-AndroidNdk::Ndk AndroidNdk::ndk{};
-#endif
-
-AndroidNdk::AndroidNdk() {
-#if FILAMENT_USE_DLSYM(26)
-    std::call_once(sInitOnce, [] {
-        // note: we don't need to dlclose() mNativeWindowLib here, because the library will be cleaned
-        // when the process ends and dlopen() are ref-counted. dlclose() NDK documentation documents
-        // not to call dlclose().
-        if (__builtin_available(android 26, *)) {
-            void* h = dlopen("libnativewindow.so", RTLD_LOCAL | RTLD_NOW);
-            if (h) {
-                loadSymbol(h, "AHardwareBuffer_acquire", ndk.AHardwareBuffer_acquire);
-                loadSymbol(h, "AHardwareBuffer_release", ndk.AHardwareBuffer_release);
-                loadSymbol(h, "AHardwareBuffer_describe", ndk.AHardwareBuffer_describe);
-            }
-        }
-    });
-#endif
-}
-
-} // filament::backend
--- a/Show More
+++ b/Show More