add external sampler example

Five custom variables (varyings) are now available on the condition that
the `color` attribute is not requested.

FIXES=[404930099]

.clang-format

@@ -0,0 +1,68 @@
+BasedOnStyle: LLVM
+AccessModifierOffset: -4
+AlignAfterOpenBracket: DontAlign
+AlignConsecutiveAssignments: None
+AlignOperands: Align
+AllowAllArgumentsOnNextLine: false
+AllowAllConstructorInitializersOnNextLine: false
+AllowAllParametersOfDeclarationOnNextLine: true
+AllowShortBlocksOnASingleLine: false
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: All
+AllowShortIfStatementsOnASingleLine: Always
+AllowShortLambdasOnASingleLine: All
+AllowShortLoopsOnASingleLine: true
+AlwaysBreakAfterReturnType: None
+AlwaysBreakTemplateDeclarations: Yes
+BreakBeforeBraces: Custom
+BracedInitializerIndentWidth: 4
+BraceWrapping:
+  AfterCaseLabel: false
+  AfterClass: false
+  AfterControlStatement: Never
+  AfterEnum: false
+  AfterFunction: false
+  AfterNamespace: false
+  AfterUnion: false
+  BeforeCatch: false
+  BeforeElse: false
+  IndentBraces: false
+  SplitEmptyFunction: false
+  SplitEmptyRecord: true
+BreakBeforeBinaryOperators: None
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializers: BeforeColon
+BreakInheritanceList: BeforeColon
+ColumnLimit: 100
+CompactNamespaces: false
+ContinuationIndentWidth: 8
+Cpp11BracedListStyle: false
+IndentCaseLabels: true
+IndentPPDirectives: None
+IndentWidth: 4
+KeepEmptyLinesAtTheStartOfBlocks: true
+MaxEmptyLinesToKeep: 2
+NamespaceIndentation: None
+ObjCSpaceAfterProperty: false
+ObjCSpaceBeforeProtocolList: true
+PointerAlignment: Left
+ReflowComments: true
+SpaceAfterCStyleCast: true
+SpaceAfterLogicalNot: false
+SpaceAfterTemplateKeyword: false
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeCpp11BracedList: false
+SpaceBeforeCtorInitializerColon: true
+SpaceBeforeInheritanceColon: true
+SpaceBeforeParens: ControlStatements
+SpaceBeforeRangeBasedForLoopColon: false
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 0
+SpacesInAngles: false
+SpacesInCStyleCastParentheses: false
+SpacesInContainerLiterals: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+TabWidth: 4
+UseTab: Never
+PackConstructorInitializers: Never

.github/workflows/presubmit.yml

@@ -92,15 +92,33 @@ jobs:
 
   test-renderdiff:
     name: test-renderdiff
-    runs-on: ubuntu-22.04-16core
-
+    runs-on: macos-14-xlarge
     steps:
       - uses: actions/checkout@v4.1.6
-      - uses: ./.github/actions/ubuntu-apt-add-src
+      - name: Set up Homebrew
+        id: set-up-homebrew
+        uses: Homebrew/actions/setup-homebrew@master
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.x'
+      - name: Install python prereqs
+        run: pip install mako setuptools pyyaml
       - name: Run script
         run: |
-          source ./build/linux/ci-common.sh && bash test/renderdiff/test.sh
+          bash test/renderdiff/test.sh
       - uses: actions/upload-artifact@v4
         with:
           name: presubmit-renderdiff-result
           path: ./out/renderdiff_tests
+
+  validate-wgsl-webgpu:
+    name: validate-wgsl-webgpu
+    runs-on: ubuntu-22.04-8core
+
+    steps:
+      - uses: actions/checkout@v4.1.6
+      - name: Run build script
+        run: source ./build/linux/ci-common.sh && ./build.sh -W debug test_filamat filament
+      - name: Run test
+        run: ./out/cmake-debug/libs/filamat/test_filamat --gtest_filter=MaterialCompiler.Wgsl*

.github/workflows/release.yml

@@ -9,6 +9,11 @@ name: Release
 env:
   RELEASE_TAG: ${{ github.event.inputs.release_tag }}
 
+# The default GITHUB_TOKEN does not have write permissions, which is needed to upload release
+# assets.
+permissions:
+  contents: write
+
 on:
   workflow_dispatch:
     inputs:

CMakeLists.txt

@@ -139,14 +139,14 @@ else()
     set(LINUX FALSE)
 endif()
 
-if (LINUX)
-    if (NOT FILAMENT_OSMESA_PATH STREQUAL "")
-        if (NOT EXISTS ${FILAMENT_OSMESA_PATH}/)
-            message(FATAL_ERROR "Cannot find specified OSMesa build directory: ${FILAMENT_OSMESA_PATH}")
-        endif()
-        set(FILAMENT_SUPPORTS_OSMESA TRUE)
+if (NOT FILAMENT_OSMESA_PATH STREQUAL "")
+    if (NOT EXISTS ${FILAMENT_OSMESA_PATH}/)
+        message(FATAL_ERROR "Cannot find specified OSMesa build directory: ${FILAMENT_OSMESA_PATH}")
     endif()
+    set(FILAMENT_SUPPORTS_OSMESA TRUE)
+endif()
 
+if (LINUX)
     if (FILAMENT_SUPPORTS_WAYLAND)
         add_definitions(-DFILAMENT_SUPPORTS_WAYLAND)
         set(FILAMENT_SUPPORTS_X11 FALSE)
@@ -184,6 +184,12 @@ if (NOT ANDROID AND NOT WEBGL AND NOT IOS AND NOT FILAMENT_LINUX_IS_MOBILE)
     set(IS_HOST_PLATFORM TRUE)
 endif()
 
+if (APPLE)
+    if (FILAMENT_SUPPORTS_OSMESA)
+        add_definitions(-DFILAMENT_SUPPORTS_OSMESA)
+    endif()
+endif()
+
 if (WIN32)
     # Link statically against c/c++ lib to avoid missing redistriburable such as
     # "VCRUNTIME140.dll not found. Try reinstalling the app.", but give users
@@ -601,6 +607,14 @@ if (FILAMENT_SUPPORTS_METAL)
     set(MATC_API_FLAGS ${MATC_API_FLAGS} -a metal)
 endif()
 
+# With WebGPU, push constants are not supported. Skinning uses them.
+# WebGPU has a proposal to add push constants at https://github.com/gpuweb/gpuweb/blob/main/proposals/push-constants.md
+# With WebGPU, Tint does not support ClipDistance which is used in Stereo.  Mentioned in comment
+# https://github.com/google/dawn/blob/855d17b08abdf02f9142bf5a8f14d0ea088810a4/src/tint/lang/spirv/reader/ast_parser/function.cc#L4434
+if (FILAMENT_SUPPORTS_WEBGPU)
+    set(MATC_API_FLAGS ${MATC_API_FLAGS} -a webgpu --variant-filter=skinning,stereo)
+endif()
+
 # Disable ESSL 1.0 code generation.
 if (NOT FILAMENT_ENABLE_FEATURE_LEVEL_0)
     set(MATC_API_FLAGS ${MATC_API_FLAGS} -1)

NEW_RELEASE_NOTES.md

@@ -7,4 +7,6 @@ for next branch cut* header.
 appropriate header in [RELEASE_NOTES.md](./RELEASE_NOTES.md).
 
 ## Release notes for next branch cut
-- materials: add an optional `transformName` field to sampler material parameters. [⚠️ **New Material Version**]
+
+- materials: five custom variables (varyings) are now available on the condition that the `color` attribute is not requested (b/404930099). [⚠️ **New Material Version**]
+

README.md

@@ -31,7 +31,7 @@ repositories {
 }
 
 dependencies {
-    implementation 'com.google.android.filament:filament-android:1.58.0'
+    implementation 'com.google.android.filament:filament-android:1.58.1'
 }
 ```
 
@@ -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', '~> 1.58.0'
+pod 'Filament', '~> 1.58.1'
 ```
 
 ## Documentation

RELEASE_NOTES.md

@@ -7,6 +7,17 @@ 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).
 
+## v1.58.2
+
+- engine: Generate 1D instead of 3D LUTs for color grading whenever possible.
+
+## v1.58.1
+
+
+## v1.58.0
+
+- materials: add an optional `transformName` field to sampler material parameters. [⚠️ **New Material Version**]
+
 ## v1.57.3
 
 - android: breaking changes to API KTX1Loader::createIndirectLight and KTX1Loader::createSkybox

android/build.gradle

@@ -71,10 +71,9 @@ buildscript {
             .gradleProperty("com.google.android.filament.include-webgpu")
             .isPresent()
 
-    // TODO: Uncomment below when fgviewer is ready
-    // def fgviewer = providers
-    //         .gradleProperty("com.google.android.filament.fgviewer")
-    //         .isPresent()
+    def fgviewer = providers
+                 .gradleProperty("com.google.android.filament.fgviewer")
+                 .isPresent()
 
     def matdbg = providers
             .gradleProperty("com.google.android.filament.matdbg")
@@ -95,7 +94,7 @@ buildscript {
 
     ext.versions = [
         'jdk': 17,
-        'minSdk': 21,
+        'minSdk': 26,
         'targetSdk': 34,
         'compileSdk': 34,
         'kotlin': '2.0.21',
@@ -126,13 +125,12 @@ buildscript {
     ext.cmakeArgs = [
         "--no-warn-unused-cli",
         "-DANDROID_PIE=ON",
-        "-DANDROID_PLATFORM=21",
+        "-DANDROID_PLATFORM=26",
         "-DANDROID_STL=c++_static",
         "-DFILAMENT_DIST_DIR=${filamentPath}".toString(),
         "-DFILAMENT_SUPPORTS_VULKAN=${excludeVulkan ? 'OFF' : 'ON'}".toString(),
         "-DFILAMENT_SUPPORTS_WEBGPU=${includeWebGPU ? 'ON' : 'OFF'}".toString(),
-        // TODO: Uncomment below when fgviewer is ready
-        // "-DFILAMENT_ENABLE_FGVIEWER=${fgviewer ? 'ON' : 'OFF'}".toString(),
+        "-DFILAMENT_ENABLE_FGVIEWER=${fgviewer ? 'ON' : 'OFF'}".toString(),
         "-DFILAMENT_ENABLE_MATDBG=${matdbg ? 'ON' : 'OFF'}".toString(),
         "-DFILAMENT_DISABLE_MATOPT=${matnopt ? 'ON' : 'OFF'}".toString()
     ]
@@ -202,7 +200,7 @@ subprojects {
             ndkVersion versions.ndk
 
             defaultConfig {
-                minSdkVersion versions.minSdk
+                minSdkVersion 26
                 targetSdkVersion versions.targetSdk
 
                 externalNativeBuild {

android/filamat-android/CMakeLists.txt

@@ -11,6 +11,13 @@ if (FILAMENT_SUPPORTS_VULKAN)
     message("Library filamat ignores Vulkan settings")
 endif()
 
+if (FILAMENT_SUPPORTS_WEBGPU)
+    # See third_party/dawn/tnt/CMakeLists.txt and libs/filamat/CMakeLists.txt
+    add_library(tint STATIC IMPORTED)
+    set_target_properties(tint PROPERTIES IMPORTED_LOCATION
+            ${FILAMENT_DIR}/lib/${ANDROID_ABI}/libtint_combined.a)
+endif()
+
 add_library(${FILAMAT_FLAVOR} STATIC IMPORTED)
 set_target_properties(${FILAMAT_FLAVOR} PROPERTIES IMPORTED_LOCATION
         ${FILAMENT_DIR}/lib/${ANDROID_ABI}/lib${FILAMAT_FLAVOR}.a)
@@ -50,4 +57,5 @@ target_link_libraries(filamat-jni
         utils
         log
         smol-v
+        $<$<STREQUAL:${FILAMENT_SUPPORTS_WEBGPU},ON>:tint>
 )

android/filament-android/CMakeLists.txt

@@ -2,8 +2,7 @@ cmake_minimum_required(VERSION 3.19)
 project(filament-android)
 
 option(FILAMENT_SUPPORTS_VULKAN "Enables Vulkan on Android" OFF)
-# TODO: Uncomment below when fgviewer is ready
-# option(FILAMENT_ENABLE_FGVIEWER "Enables Frame Graph Viewer" OFF)
+option(FILAMENT_ENABLE_FGVIEWER "Enables Frame Graph Viewer" OFF)
 option(FILAMENT_ENABLE_MATDBG "Enables Material debugger" OFF)
 option(FILAMENT_DISABLE_MATOPT "Disables material optimizations" OFF)
 option(FILAMENT_SUPPORTS_WEBGPU "Enables WebGPU on Android" OFF)
@@ -30,10 +29,6 @@ add_library(filaflat STATIC IMPORTED)
 set_target_properties(filaflat PROPERTIES IMPORTED_LOCATION
         ${FILAMENT_DIR}/lib/${ANDROID_ABI}/libfilaflat.a)
 
-add_library(filamat STATIC IMPORTED)
-set_target_properties(filamat PROPERTIES IMPORTED_LOCATION
-        ${FILAMENT_DIR}/lib/${ANDROID_ABI}/libfilamat.a)
-
 add_library(geometry STATIC IMPORTED)
 set_target_properties(geometry PROPERTIES IMPORTED_LOCATION
         ${FILAMENT_DIR}/lib/${ANDROID_ABI}/libgeometry.a)
@@ -60,12 +55,11 @@ add_library(smol-v STATIC IMPORTED)
 set_target_properties(smol-v PROPERTIES IMPORTED_LOCATION
         ${FILAMENT_DIR}/lib/${ANDROID_ABI}/libsmol-v.a)
 
-# TODO: Uncomment below when fgviewer is ready
-# if (FILAMENT_ENABLE_FGVIEWER)
-#     add_library(fgviewer STATIC IMPORTED)
-#     set_target_properties(fgviewer PROPERTIES IMPORTED_LOCATION
-#             ${FILAMENT_DIR}/lib/${ANDROID_ABI}/libfgviewer.a)
-# endif()
+if (FILAMENT_ENABLE_FGVIEWER)
+    add_library(fgviewer STATIC IMPORTED)
+    set_target_properties(fgviewer PROPERTIES IMPORTED_LOCATION
+            ${FILAMENT_DIR}/lib/${ANDROID_ABI}/libfgviewer.a)
+endif()
 
 if (FILAMENT_ENABLE_MATDBG)
     add_library(matdbg STATIC IMPORTED)
@@ -133,8 +127,7 @@ target_link_libraries(filament-jni
     # libgeometry is PUBLIC because gltfio uses it.
     PUBLIC geometry
 
-    # TODO: Uncomment below when fgviewer is ready
-    # $<$<STREQUAL:${FILAMENT_ENABLE_FGVIEWER},ON>:fgviewer>
+    $<$<STREQUAL:${FILAMENT_ENABLE_FGVIEWER},ON>:fgviewer>
     $<$<STREQUAL:${FILAMENT_ENABLE_MATDBG},ON>:matdbg>
     $<$<STREQUAL:${FILAMENT_ENABLE_MATDBG},ON>:filamat>
     $<$<STREQUAL:${FILAMENT_SUPPORTS_VULKAN},ON>:bluevk>

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

@@ -68,6 +68,21 @@ Java_com_google_android_filament_Texture_nIsTextureSwizzleSupported(JNIEnv*, jcl
     return (jboolean) Texture::isTextureSwizzleSupported(*engine);
 }
 
+
+extern "C" JNIEXPORT jint JNICALL
+Java_com_google_android_filament_Texture_nGetMaxTextureSize(JNIEnv *, jclass,
+        jlong nativeEngine, jint sampler) {
+    Engine *engine = (Engine *) nativeEngine;
+    return Texture::getMaxTextureSize(*engine, (Texture::Sampler)sampler);
+}
+
+extern "C" JNIEXPORT jint JNICALL
+Java_com_google_android_filament_Texture_nGetMaxArrayTextureLayers(JNIEnv *, jclass,
+        jlong nativeEngine) {
+    Engine *engine = (Engine *) nativeEngine;
+    return Texture::getMaxArrayTextureLayers(*engine);
+}
+
 extern "C" JNIEXPORT jboolean JNICALL
 Java_com_google_android_filament_Texture_nValidatePixelFormatAndType(JNIEnv*, jclass,
         jint internalFormat, jint pixelDataFormat, jint pixelDataType) {

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

@@ -46,9 +46,8 @@ import static com.google.android.filament.Asserts.assertFloat4In;
  *
  * <h1>Performance</h1>
  *
- * Creating a new ColorGrading object may be more expensive than other Filament objects as a
- * 3D LUT may need to be generated. The generation of a 3D LUT, if necessary, may happen on
- * the CPU.
+ * Creating a new ColorGrading object may be more expensive than other Filament objects as a LUT may
+ * need to be generated. The generation of this LUT, if necessary, may happen on the CPU.
  *
  * <h1>Ordering</h1>
  *
@@ -160,6 +159,10 @@ public class ColorGrading {
          * quality level will use a 32x32x32 10 bit LUT, a high quality will use a 32x32x32 16 bit
          * LUT, and a ultra quality will use a 64x64x64 16 bit LUT.
          *
+         * This setting has no effect if generating a 1D LUT.
+         *
+         * This overrides the values set by format() and dimensions().
+         *
          * The default quality is {@link QualityLevel#MEDIUM}.
          *
          * @param qualityLevel The desired quality of the color grading process
@@ -175,6 +178,8 @@ public class ColorGrading {
          * When color grading is implemented using a 3D LUT, this sets the texture format of
          * of the LUT. This overrides the value set by quality().
          *
+         * This setting has no effect if generating a 1D LUT.
+         *
          * The default is INTEGER
          *
          * @param format The desired format of the 3D LUT.
@@ -190,6 +195,8 @@ public class ColorGrading {
          * When color grading is implemented using a 3D LUT, this sets the dimension of the LUT.
          * This overrides the value set by quality().
          *
+         * This setting has no effect if generating a 1D LUT.
+         *
          * The default is 32
          *
          * @param dim The desired dimension of the LUT. Between 16 and 64.
@@ -616,4 +623,3 @@ public class ColorGrading {
 
     private static native long nBuilderBuild(long nativeBuilder, long nativeEngine);
 }
-

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

@@ -691,6 +691,24 @@ public class Texture {
                 pixelDataType.ordinal());
     }
 
+    /**
+     * @param engine {@link Engine}
+     * @param type Texture sampler type
+     * @return The maximum size in texels of a texture of type \p type. At least 2048 for
+     *         2D textures, 256 for 3D textures
+     */
+    public static int getMaxTextureSize(@NonNull Engine engine, Sampler type) {
+        return nGetMaxTextureSize(engine.getNativeObject(), type.ordinal());
+    }
+
+    /**
+     * @param engine {@link Engine}
+     * @return The maximum number of layers supported by texture arrays. At least 256.
+     */
+    public static int getMaxArrayTextureLayers(@NonNull Engine engine) {
+        return nGetMaxArrayTextureLayers(engine.getNativeObject());
+    }
+
     /**
      * Use <code>Builder</code> to construct a <code>Texture</code> object instance.
      */
@@ -1289,6 +1307,8 @@ public class Texture {
     private static native boolean nIsTextureFormatSupported(long nativeEngine, int internalFormat);
     private static native boolean nIsTextureFormatMipmappable(long nativeEngine, int internalFormat);
     private static native boolean nIsTextureSwizzleSupported(long nativeEngine);
+    private static native int nGetMaxTextureSize(long nativeObject, int ordinal);
+    private static native int nGetMaxArrayTextureLayers(long nativeObject);
 
     private static native boolean nValidatePixelFormatAndType(int internalFormat, int pixelDataFormat,
             int pixelDataType);

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

@@ -31,8 +31,6 @@ package com.google.android.filament;
  *   <li>DisplayRangeToneMapper</li>
  * </ul>
  * </ul>
- *
- * You can create custom tone mapping operators by subclassing ToneMapper.
  */
 public class ToneMapper {
     private final long mNativeObject;

android/filament-utils-android/CMakeLists.txt

@@ -4,6 +4,8 @@ project(filament-utils-android)
 set(FILAMENT_DIR ${FILAMENT_DIST_DIR})
 set(IMAGEIO_DIR ../../libs/imageio)
 
+set(CMAKE_SYSTEM_VERSION 26)
+
 add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/../gltfio-android ${CMAKE_CURRENT_BINARY_DIR}/gltfio-android)
 
 add_library(camutils STATIC IMPORTED)
@@ -30,6 +32,10 @@ add_library(iblprefilter STATIC IMPORTED)
 set_target_properties(iblprefilter PROPERTIES IMPORTED_LOCATION
         ${FILAMENT_DIR}/lib/${ANDROID_ABI}/libfilament-iblprefilter.a)
 
+add_library(bluevk STATIC IMPORTED)
+set_target_properties(bluevk PROPERTIES IMPORTED_LOCATION
+        ${FILAMENT_DIR}/lib/${ANDROID_ABI}/libbluevk.a)
+
 set(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} -Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/libfilament-utils-jni.map")
 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,max-page-size=16384")
 
@@ -57,7 +63,8 @@ target_include_directories(filament-utils-jni PRIVATE
         ..
         ../../filament/backend/include
         ${IMAGEIO_DIR}/include
-        ../../libs/utils/include)
+        ../../libs/utils/include
+        ../../libs/bluevk/include)
 
 set_target_properties(filament-utils-jni PROPERTIES LINK_DEPENDS
         ${CMAKE_CURRENT_SOURCE_DIR}/libfilament-utils-jni.symbols)
@@ -71,4 +78,6 @@ target_link_libraries(filament-utils-jni
         image
         ktxreader
         viewer
+        bluevk
+        android
 )

android/filament-utils-android/build.gradle

@@ -12,6 +12,10 @@ android {
         }
     }
 
+    defaultConfig {
+        minSdkVersion 26
+    }        
+
     packagingOptions {
         // No need to package up the following shared libs, which arise as a side effect of our
         // externalNativeBuild dependencies. When clients pick and choose from project-level gradle

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

@@ -14,12 +14,21 @@
  * limitations under the License.
  */
 
+
+#include <android/hardware_buffer.h>
+#include <android/hardware_buffer_jni.h>
 #include <jni.h>
 
 #include <filament/Engine.h>
 #include <filament/IndirectLight.h>
 #include <filament/Skybox.h>
 
+#include <backend/Platform.h>
+#include <backend/platforms/PlatformEGLAndroid.h>
+#include <backend/platforms/VulkanPlatformAndroid.h>
+
+#include <utils/Log.h>
+
 #include <ktxreader/Ktx1Reader.h>
 
 #include "common/NioUtils.h"
@@ -29,6 +38,8 @@ using namespace filament::math;
 using namespace image;
 using namespace ktxreader;
 
+using namespace filament::backend;
+
 jlong nCreateHDRTexture(JNIEnv* env, jclass,
         jlong nativeEngine, jobject javaBuffer, jint remaining, jint internalFormat);
 
@@ -79,6 +90,37 @@ static jboolean nGetSphericalHarmonics(JNIEnv* env, jclass, jobject javaBuffer,
     return success ? JNI_TRUE : JNI_FALSE;
 }
 
+static jlong nSetExternalImageOnTexture(JNIEnv* env, jclass, jlong nativeEngine, jlong nativeTexture,
+        jobject hardwareBuffer, jboolean srgb) {
+    utils::slog.e <<"--------- jni nSetExternalImageOnTexture" << utils::io::endl;
+    Engine* engine = (Engine*) nativeEngine;
+    Texture* texture = (Texture*) nativeTexture;
+
+    Platform* platform = engine->getPlatform();
+    AHardwareBuffer* nativeBuffer = nullptr;
+    if (__builtin_available(android 26, *)) {
+        nativeBuffer = AHardwareBuffer_fromHardwareBuffer(env, hardwareBuffer);
+    }
+
+    utils::slog.e <<"--------- jni nSetExternalImageOnTexture buf=" << nativeBuffer << utils::io::endl;    
+
+    if (!nativeBuffer) {
+        return 0;
+    }
+
+    if (engine->getBackend() == Backend::OPENGL) {
+        PlatformEGLAndroid* eglPlatform = (PlatformEGLAndroid*) platform;
+        auto ref = eglPlatform->createExternalImage(nativeBuffer, srgb == JNI_TRUE);
+        texture->setExternalImage(*engine, ref);
+    } else if (engine->getBackend() == Backend::VULKAN) {
+        VulkanPlatformAndroid* vulkanPlatform = (VulkanPlatformAndroid*) platform;
+        auto ref = vulkanPlatform->createExternalImage(nativeBuffer, srgb == JNI_TRUE);
+        texture->setExternalImage(*engine, ref);
+    }
+    return 0;    
+}
+
+
 JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void*) {
     JNIEnv* env;
     if (vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6) != JNI_OK) {
@@ -108,5 +150,14 @@ JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void*) {
     rc = env->RegisterNatives(hdrloaderClass, hdrMethods, sizeof(hdrMethods) / sizeof(JNINativeMethod));
     if (rc != JNI_OK) return rc;
 
+    jclass loaderClass = env->FindClass("com/google/android/filament/utils/ExternalImage");
+    if (loaderClass == nullptr) return JNI_ERR;
+    static const JNINativeMethod methods[] = {
+        { (char*) "nSetExternalImageOnTexture", (char*) "(JJLandroid/hardware/HardwareBuffer;Z)J",
+            reinterpret_cast<void*>(nSetExternalImageOnTexture) },
+    };
+    rc = env->RegisterNatives(loaderClass, methods, sizeof(methods) / sizeof(JNINativeMethod));
+    if (rc != JNI_OK) return rc;    
+
     return JNI_VERSION_1_6;
 }

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

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2017 Romain Guy
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.android.filament.utils
+
+import android.hardware.HardwareBuffer
+import com.google.android.filament.Engine
+import com.google.android.filament.Texture
+
+object ExternalImage {
+    fun setOnTexture(
+        engine: Engine,
+        texture: Texture,
+        buffer: HardwareBuffer,
+        srgb: Boolean,
+    ) {
+        val nativeEngine = engine.nativeObject
+        val nativeTexture = texture.nativeObject
+        val l = nSetExternalImageOnTexture(nativeEngine, nativeTexture, buffer, srgb)
+    }
+
+    private external fun nSetExternalImageOnTexture(
+        nativeEngine: Long,
+        nativeTexture: Long,
+        buffer: HardwareBuffer,
+        srgb: Boolean,
+    ): Long
+}

android/gradle.properties

@@ -1,5 +1,5 @@
 GROUP=com.google.android.filament
-VERSION_NAME=1.58.0
+VERSION_NAME=1.58.1
 
 POM_DESCRIPTION=Real-time physically based rendering engine for Android.
 
@@ -30,4 +30,5 @@ com.google.android.filament.abis=all
 #com.google.android.filament.include-webgpu
 
 #com.google.android.filament.matdbg
+#com.google.android.filament.fgviewer
 #com.google.android.filament.matnopt

android/samples/sample-external-image/.gitignore

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

android/samples/sample-external-image/build.gradle

@@ -0,0 +1,55 @@
+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.externalimg'
+
+    compileSdkVersion versions.compileSdk
+    defaultConfig {
+        applicationId "com.google.android.filament.externalimg"
+        minSdkVersion 26
+        targetSdkVersion versions.targetSdk
+    }
+
+    // NOTE: This is a workaround required because the AGP task collectReleaseDependencies
+    //       is not configuration-cache friendly yet; this is only useful for Play publication
+    dependenciesInfo {
+        includeInApk = false
+    }
+
+    // We use the .filamat extension for materials compiled with matc
+    // Telling aapt to not compress them allows to load them efficiently
+    aaptOptions {
+        noCompress 'filamat', 'ktx'
+    }
+
+    compileOptions {
+        sourceCompatibility versions.jdk
+        targetCompatibility versions.jdk
+    }
+}
+
+dependencies {
+    implementation deps.kotlin
+    implementation deps.androidx.core
+    implementation project(':filament-android')
+    implementation project(':filament-utils-android')    
+}

android/samples/sample-external-image/src/main/AndroidManifest.xml

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+  Copyright (C) 2019 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.
+ -->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+  <uses-permission android:name="android.permission.CAMERA" />
+
+  <uses-feature android:name="android.hardware.camera" />
+  <uses-feature android:name="android.hardware.camera.autofocus" />
+
+  <application
+      android:allowBackup="true"
+      android:icon="@mipmap/ic_launcher"
+      android:label="@string/app_name"
+      android:roundIcon="@mipmap/ic_launcher_round"
+      android:supportsRtl="true"
+      android:theme="@style/AppTheme">
+    <activity
+        android:exported="true"
+        android:name=".MainActivity">
+      <intent-filter>
+        <action android:name="android.intent.action.MAIN"/>
+
+        <category android:name="android.intent.category.LAUNCHER"/>
+      </intent-filter>
+    </activity>
+  </application>
+
+</manifest>

android/samples/sample-external-image/src/main/java/com/google/android/filament/externalimg/CameraHelper.kt

@@ -0,0 +1,247 @@
+/*
+ * Copyright (C) 2019 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.externalimg
+
+import android.app.Activity
+import android.content.Context
+import android.content.pm.PackageManager
+import android.graphics.SurfaceTexture
+import android.hardware.camera2.*
+import android.os.Handler
+import android.os.HandlerThread
+import android.util.Log
+import android.util.Size
+import android.view.Surface
+import androidx.core.content.ContextCompat
+
+import android.Manifest
+import android.graphics.ImageFormat
+import android.hardware.HardwareBuffer
+import android.media.ImageReader
+import android.opengl.Matrix
+import android.os.Build
+import android.os.Looper
+import androidx.annotation.RequiresApi
+
+import com.google.android.filament.*
+
+import java.util.concurrent.Semaphore
+import java.util.concurrent.TimeUnit
+
+/**
+ * Toy class that handles all interaction with the Android camera2 API.
+ * Sets the "textureTransform" and "videoTexture" parameters on the given Filament material.
+ */
+class CameraHelper(val activity: Activity, private val filamentEngine: Engine, private val filamentMaterial: MaterialInstance) {
+    private lateinit var cameraId: String
+    private lateinit var captureRequest: CaptureRequest
+
+    private val cameraOpenCloseLock = Semaphore(1)
+    private var backgroundHandler: Handler? = null
+    private var backgroundThread: HandlerThread? = null
+    private var cameraDevice: CameraDevice? = null
+    private var captureSession: CameraCaptureSession? = null
+    private var resolution = Size(640, 480)
+    private var filamentTexture: Texture? = null
+    private var filamentStream: Stream? = null
+    private val imageReader = ImageReader.newInstance(
+            resolution.width,
+            resolution.height,
+            ImageFormat.PRIVATE,
+            kImageReaderMaxImages,
+            HardwareBuffer.USAGE_GPU_SAMPLED_IMAGE)
+
+    @Suppress("deprecation")
+    private val display = if (Build.VERSION.SDK_INT >= 30) {
+        Api30Impl.getDisplay(activity)
+    } else {
+        activity.windowManager.defaultDisplay!!
+    }
+
+    @RequiresApi(30)
+    class Api30Impl {
+        companion object {
+            fun getDisplay(context: Context) = context.display!!
+        }
+    }
+
+    private val cameraCallback = object : CameraDevice.StateCallback() {
+        override fun onOpened(cameraDevice: CameraDevice) {
+            cameraOpenCloseLock.release()
+            this@CameraHelper.cameraDevice = cameraDevice
+            createCaptureSession()
+        }
+        override fun onDisconnected(cameraDevice: CameraDevice) {
+            cameraOpenCloseLock.release()
+            cameraDevice.close()
+            this@CameraHelper.cameraDevice = null
+        }
+        override fun onError(cameraDevice: CameraDevice, error: Int) {
+            onDisconnected(cameraDevice)
+            this@CameraHelper.activity.finish()
+        }
+    }
+
+    /**
+     * Fetches the latest image (if any) from ImageReader and passes its HardwareBuffer to Filament.
+     */
+    fun pushExternalImageToFilament() {
+        val stream = filamentStream
+        if (stream != null) {
+            imageReader.acquireLatestImage()?.also {
+                stream.setAcquiredImage(it.hardwareBuffer, Handler(Looper.getMainLooper())) {
+                    it.close()
+                }
+            }
+        }
+    }
+
+    /**
+     * Finds the front-facing Android camera, requests permission, and sets up a listener that will
+     * start a capture session as soon as the camera is ready.
+     */
+    fun openCamera() {
+        val manager = activity.getSystemService(Context.CAMERA_SERVICE) as CameraManager
+        try {
+            for (cameraId in manager.cameraIdList) {
+                val characteristics = manager.getCameraCharacteristics(cameraId)
+                val cameraDirection = characteristics.get(CameraCharacteristics.LENS_FACING)
+                if (cameraDirection != null && cameraDirection == CameraCharacteristics.LENS_FACING_FRONT) {
+                    continue
+                }
+
+                this.cameraId = cameraId
+                Log.i(kLogTag, "Selected camera $cameraId.")
+
+                val map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP) ?: continue
+                resolution = map.getOutputSizes(SurfaceTexture::class.java)[0]
+                Log.i(kLogTag, "Highest resolution is $resolution.")
+            }
+        } catch (e: CameraAccessException) {
+            Log.e(kLogTag, e.toString())
+        } catch (e: NullPointerException) {
+            Log.e(kLogTag, "Camera2 API is not supported on this device.")
+        }
+
+        val permission = ContextCompat.checkSelfPermission(this.activity, Manifest.permission.CAMERA)
+        if (permission != PackageManager.PERMISSION_GRANTED) {
+            activity.requestPermissions(arrayOf(Manifest.permission.CAMERA), kRequestCameraPermission)
+            return
+        }
+        if (!cameraOpenCloseLock.tryAcquire(2500, TimeUnit.MILLISECONDS)) {
+            throw RuntimeException("Time out waiting to lock camera opening.")
+        }
+        manager.openCamera(cameraId, cameraCallback, backgroundHandler)
+    }
+
+    fun onResume() {
+        backgroundThread = HandlerThread("CameraBackground").also { it.start() }
+        backgroundHandler = Handler(backgroundThread?.looper!!)
+    }
+
+    fun onPause() {
+        backgroundThread?.quitSafely()
+        try {
+            backgroundThread?.join()
+            backgroundThread = null
+            backgroundHandler = null
+        } catch (e: InterruptedException) {
+            Log.e(kLogTag, e.toString())
+        }
+    }
+
+    fun onRequestPermissionsResult(requestCode: Int, grantResults: IntArray): Boolean {
+        if (requestCode == kRequestCameraPermission) {
+            if (grantResults.size != 1 || grantResults[0] != PackageManager.PERMISSION_GRANTED) {
+                Log.e(kLogTag, "Unable to obtain camera position.")
+            }
+            return true
+        }
+        return false
+    }
+
+    private fun createCaptureSession() {
+        filamentStream?.apply { filamentEngine.destroyStream(this) }
+
+        // [Re]create the Filament Stream object that gets bound to the Texture.
+        filamentStream = Stream.Builder().build(filamentEngine)
+
+        // Create the Filament Texture object if we haven't done so already.
+        if (filamentTexture == null) {
+            filamentTexture = Texture.Builder()
+                    .sampler(Texture.Sampler.SAMPLER_EXTERNAL)
+                    .format(Texture.InternalFormat.RGB8)
+                    .build(filamentEngine)
+        }
+
+        // We are texturing a front-facing square shape so we need to generate a matrix that transforms (u, v, 0, 1)
+        // into a new UV coordinate according to the screen rotation and the aspect ratio of the camera image.
+        val aspectRatio = resolution.width.toFloat() / resolution.height.toFloat()
+        val textureTransform = FloatArray(16)
+        Matrix.setIdentityM(textureTransform, 0)
+        when (display.rotation) {
+            Surface.ROTATION_0 -> {
+                Matrix.translateM(textureTransform, 0, 1.0f, 0.0f, 0.0f)
+                Matrix.rotateM(textureTransform, 0, 90.0f, 0.0f, 0.0f, 1.0f)
+                Matrix.translateM(textureTransform, 0, 1.0f, 0.0f, 0.0f)
+                Matrix.scaleM(textureTransform, 0, -1.0f, 1.0f / aspectRatio, 1.0f)
+            }
+            Surface.ROTATION_90 -> {
+                Matrix.translateM(textureTransform, 0, 1.0f, 1.0f, 0.0f)
+                Matrix.rotateM(textureTransform, 0, 180.0f, 0.0f, 0.0f, 1.0f)
+                Matrix.translateM(textureTransform, 0, 1.0f, 0.0f, 0.0f)
+                Matrix.scaleM(textureTransform, 0, -1.0f / aspectRatio, 1.0f, 1.0f)
+            }
+            Surface.ROTATION_270 -> {
+                Matrix.translateM(textureTransform, 0, 1.0f, 0.0f, 0.0f)
+                Matrix.scaleM(textureTransform, 0, -1.0f / aspectRatio, 1.0f, 1.0f)
+            }
+        }
+
+        // Connect the Stream to the Texture and the Texture to the MaterialInstance.
+        val sampler = TextureSampler(TextureSampler.MinFilter.LINEAR, TextureSampler.MagFilter.LINEAR, TextureSampler.WrapMode.CLAMP_TO_EDGE)
+        filamentTexture!!.setExternalStream(filamentEngine, filamentStream!!)
+        filamentMaterial.setParameter("videoTexture", filamentTexture!!, sampler)
+        filamentMaterial.setParameter("textureTransform", MaterialInstance.FloatElement.MAT4, textureTransform, 0, 1)
+
+        // Start the capture session. You could also use TEMPLATE_PREVIEW here.
+        val captureRequestBuilder = cameraDevice!!.createCaptureRequest(CameraDevice.TEMPLATE_RECORD)
+        captureRequestBuilder.addTarget(imageReader.surface)
+
+        cameraDevice?.createCaptureSession(listOf(imageReader.surface),
+                object : CameraCaptureSession.StateCallback() {
+                    override fun onConfigured(cameraCaptureSession: CameraCaptureSession) {
+                        if (cameraDevice == null) return
+                        captureSession = cameraCaptureSession
+                        captureRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE)
+                        captureRequest = captureRequestBuilder.build()
+                        captureSession!!.setRepeatingRequest(captureRequest, null, backgroundHandler)
+                        Log.i(kLogTag, "Created CaptureRequest.")
+                    }
+                    override fun onConfigureFailed(session: CameraCaptureSession) {
+                        Log.e(kLogTag, "onConfigureFailed")
+                    }
+                }, null)
+    }
+
+    companion object {
+        private const val kLogTag = "CameraHelper"
+        private const val kRequestCameraPermission = 1
+        private const val kImageReaderMaxImages = 7
+    }
+
+}

android/samples/sample-external-image/src/main/java/com/google/android/filament/externalimg/CameraHelper.kt~

@@ -0,0 +1,247 @@
+/*
+ * Copyright (C) 2019 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.externalimg
+
+import android.app.Activity
+import android.content.Context
+import android.content.pm.PackageManager
+import android.graphics.SurfaceTexture
+import android.hardware.camera2.*
+import android.os.Handler
+import android.os.HandlerThread
+import android.util.Log
+import android.util.Size
+import android.view.Surface
+import androidx.core.content.ContextCompat
+
+import android.Manifest
+import android.graphics.ImageFormat
+import android.hardware.HardwareBuffer
+import android.media.ImageReader
+import android.opengl.Matrix
+import android.os.Build
+import android.os.Looper
+import androidx.annotation.RequiresApi
+
+import com.google.android.filament.*
+
+import java.util.concurrent.Semaphore
+import java.util.concurrent.TimeUnit
+
+/**
+ * Toy class that handles all interaction with the Android camera2 API.
+ * Sets the "textureTransform" and "videoTexture" parameters on the given Filament material.
+ */
+class CameraHelper(val activity: Activity, private val filamentEngine: Engine, private val filamentMaterial: MaterialInstance) {
+    private lateinit var cameraId: String
+    private lateinit var captureRequest: CaptureRequest
+
+    private val cameraOpenCloseLock = Semaphore(1)
+    private var backgroundHandler: Handler? = null
+    private var backgroundThread: HandlerThread? = null
+    private var cameraDevice: CameraDevice? = null
+    private var captureSession: CameraCaptureSession? = null
+    private var resolution = Size(640, 480)
+    private var filamentTexture: Texture? = null
+    private var filamentStream: Stream? = null
+    private val imageReader = ImageReader.newInstance(
+            resolution.width,
+            resolution.height,
+            ImageFormat.PRIVATE,
+            kImageReaderMaxImages,
+            HardwareBuffer.USAGE_GPU_SAMPLED_IMAGE)
+
+    @Suppress("deprecation")
+    private val display = if (Build.VERSION.SDK_INT >= 30) {
+        Api30Impl.getDisplay(activity)
+    } else {
+        activity.windowManager.defaultDisplay!!
+    }
+
+    @RequiresApi(30)
+    class Api30Impl {
+        companion object {
+            fun getDisplay(context: Context) = context.display!!
+        }
+    }
+
+    private val cameraCallback = object : CameraDevice.StateCallback() {
+        override fun onOpened(cameraDevice: CameraDevice) {
+            cameraOpenCloseLock.release()
+            this@CameraHelper.cameraDevice = cameraDevice
+            createCaptureSession()
+        }
+        override fun onDisconnected(cameraDevice: CameraDevice) {
+            cameraOpenCloseLock.release()
+            cameraDevice.close()
+            this@CameraHelper.cameraDevice = null
+        }
+        override fun onError(cameraDevice: CameraDevice, error: Int) {
+            onDisconnected(cameraDevice)
+            this@CameraHelper.activity.finish()
+        }
+    }
+
+    /**
+     * Fetches the latest image (if any) from ImageReader and passes its HardwareBuffer to Filament.
+     */
+    fun pushExternalImageToFilament() {
+        val stream = filamentStream
+        if (stream != null) {
+            imageReader.acquireLatestImage()?.also {
+                stream.setAcquiredImage(it.hardwareBuffer, Handler(Looper.getMainLooper())) {
+                    it.close()
+                }
+            }
+        }
+    }
+
+    /**
+     * Finds the front-facing Android camera, requests permission, and sets up a listener that will
+     * start a capture session as soon as the camera is ready.
+     */
+    fun openCamera() {
+        val manager = activity.getSystemService(Context.CAMERA_SERVICE) as CameraManager
+        try {
+            for (cameraId in manager.cameraIdList) {
+                val characteristics = manager.getCameraCharacteristics(cameraId)
+                val cameraDirection = characteristics.get(CameraCharacteristics.LENS_FACING)
+                if (cameraDirection != null && cameraDirection == CameraCharacteristics.LENS_FACING_FRONT) {
+                    continue
+                }
+
+                this.cameraId = cameraId
+                Log.i(kLogTag, "Selected camera $cameraId.")
+
+                val map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP) ?: continue
+                resolution = map.getOutputSizes(SurfaceTexture::class.java)[0]
+                Log.i(kLogTag, "Highest resolution is $resolution.")
+            }
+        } catch (e: CameraAccessException) {
+            Log.e(kLogTag, e.toString())
+        } catch (e: NullPointerException) {
+            Log.e(kLogTag, "Camera2 API is not supported on this device.")
+        }
+
+        val permission = ContextCompat.checkSelfPermission(this.activity, Manifest.permission.CAMERA)
+        if (permission != PackageManager.PERMISSION_GRANTED) {
+            activity.requestPermissions(arrayOf(Manifest.permission.CAMERA), kRequestCameraPermission)
+            return
+        }
+        if (!cameraOpenCloseLock.tryAcquire(2500, TimeUnit.MILLISECONDS)) {
+            throw RuntimeException("Time out waiting to lock camera opening.")
+        }
+        manager.openCamera(cameraId, cameraCallback, backgroundHandler)
+    }
+
+    fun onResume() {
+        backgroundThread = HandlerThread("CameraBackground").also { it.start() }
+        backgroundHandler = Handler(backgroundThread?.looper!!)
+    }
+
+    fun onPause() {
+        backgroundThread?.quitSafely()
+        try {
+            backgroundThread?.join()
+            backgroundThread = null
+            backgroundHandler = null
+        } catch (e: InterruptedException) {
+            Log.e(kLogTag, e.toString())
+        }
+    }
+
+    fun onRequestPermissionsResult(requestCode: Int, grantResults: IntArray): Boolean {
+        if (requestCode == kRequestCameraPermission) {
+            if (grantResults.size != 1 || grantResults[0] != PackageManager.PERMISSION_GRANTED) {
+                Log.e(kLogTag, "Unable to obtain camera position.")
+            }
+            return true
+        }
+        return false
+    }
+
+    private fun createCaptureSession() {
+        filamentStream?.apply { filamentEngine.destroyStream(this) }
+
+        // [Re]create the Filament Stream object that gets bound to the Texture.
+        filamentStream = Stream.Builder().build(filamentEngine)
+
+        // Create the Filament Texture object if we haven't done so already.
+        if (filamentTexture == null) {
+            filamentTexture = Texture.Builder()
+                    .sampler(Texture.Sampler.SAMPLER_EXTERNAL)
+                    .format(Texture.InternalFormat.RGB8)
+                    .build(filamentEngine)
+        }
+
+        // We are texturing a front-facing square shape so we need to generate a matrix that transforms (u, v, 0, 1)
+        // into a new UV coordinate according to the screen rotation and the aspect ratio of the camera image.
+        val aspectRatio = resolution.width.toFloat() / resolution.height.toFloat()
+        val textureTransform = FloatArray(16)
+        Matrix.setIdentityM(textureTransform, 0)
+        when (display.rotation) {
+            Surface.ROTATION_0 -> {
+                Matrix.translateM(textureTransform, 0, 1.0f, 0.0f, 0.0f)
+                Matrix.rotateM(textureTransform, 0, 90.0f, 0.0f, 0.0f, 1.0f)
+                Matrix.translateM(textureTransform, 0, 1.0f, 0.0f, 0.0f)
+                Matrix.scaleM(textureTransform, 0, -1.0f, 1.0f / aspectRatio, 1.0f)
+            }
+            Surface.ROTATION_90 -> {
+                Matrix.translateM(textureTransform, 0, 1.0f, 1.0f, 0.0f)
+                Matrix.rotateM(textureTransform, 0, 180.0f, 0.0f, 0.0f, 1.0f)
+                Matrix.translateM(textureTransform, 0, 1.0f, 0.0f, 0.0f)
+                Matrix.scaleM(textureTransform, 0, -1.0f / aspectRatio, 1.0f, 1.0f)
+            }
+            Surface.ROTATION_270 -> {
+                Matrix.translateM(textureTransform, 0, 1.0f, 0.0f, 0.0f)
+                Matrix.scaleM(textureTransform, 0, -1.0f / aspectRatio, 1.0f, 1.0f)
+            }
+        }
+
+        // Connect the Stream to the Texture and the Texture to the MaterialInstance.
+        val sampler = TextureSampler(TextureSampler.MinFilter.LINEAR, TextureSampler.MagFilter.LINEAR, TextureSampler.WrapMode.CLAMP_TO_EDGE)
+        filamentTexture!!.setExternalStream(filamentEngine, filamentStream!!)
+        filamentMaterial.setParameter("videoTexture", filamentTexture!!, sampler)
+        filamentMaterial.setParameter("textureTransform", MaterialInstance.FloatElement.MAT4, textureTransform, 0, 1)
+
+        // Start the capture session. You could also use TEMPLATE_PREVIEW here.
+        val captureRequestBuilder = cameraDevice!!.createCaptureRequest(CameraDevice.TEMPLATE_RECORD)
+        captureRequestBuilder.addTarget(imageReader.surface)
+
+        cameraDevice?.createCaptureSession(listOf(imageReader.surface),
+                object : CameraCaptureSession.StateCallback() {
+                    override fun onConfigured(cameraCaptureSession: CameraCaptureSession) {
+                        if (cameraDevice == null) return
+                        captureSession = cameraCaptureSession
+                        captureRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE)
+                        captureRequest = captureRequestBuilder.build()
+                        captureSession!!.setRepeatingRequest(captureRequest, null, backgroundHandler)
+                        Log.i(kLogTag, "Created CaptureRequest.")
+                    }
+                    override fun onConfigureFailed(session: CameraCaptureSession) {
+                        Log.e(kLogTag, "onConfigureFailed")
+                    }
+                }, null)
+    }
+
+    companion object {
+        private const val kLogTag = "CameraHelper"
+        private const val kRequestCameraPermission = 1
+        private const val kImageReaderMaxImages = 7
+    }
+
+}

android/samples/sample-external-image/src/main/java/com/google/android/filament/externalimg/ExternalImageHelper.kt

@@ -0,0 +1,193 @@
+import android.graphics.*
+import android.hardware.HardwareBuffer
+import android.media.Image
+import android.media.ImageReader
+import android.os.Build
+import android.os.Handler
+import android.os.HandlerThread
+import android.util.Log
+import android.view.Surface
+import androidx.annotation.RequiresApi
+import java.util.concurrent.CompletableFuture
+import java.util.concurrent.TimeUnit
+import java.util.concurrent.TimeoutException
+
+@RequiresApi(Build.VERSION_CODES.O)
+object CanvasToHardwareBufferUtil {
+    private const val TAG = "CanvasToHardwareBufferKt"
+    private const val IMAGE_READER_TIMEOUT_MS = 3000L // Timeout for waiting buffer
+
+    fun drawToHardwareBuffer(
+        width: Int,
+        height: Int,
+    ): HardwareBuffer? {
+        if (width <= 0 || height <= 0) {
+            Log.e(TAG, "Invalid dimensions: width=$width, height=$height")
+            return null
+        }
+
+        var handlerThread: HandlerThread? = null
+        var imageReader: ImageReader? = null
+        var surface: Surface? = null // Keep track for logging/debugging if needed
+        // Use var as it's assigned within the try block after future completion
+        var receivedHardwareBuffer: HardwareBuffer? = null
+
+        try {
+            // 1. Setup HandlerThread for ImageReader callbacks
+            handlerThread = HandlerThread("ImageReaderThreadKt").apply { start() }
+            val imageReaderHandler = Handler(handlerThread.looper)
+
+            // 2. Use CompletableFuture to wait for the buffer from the listener
+            val bufferFuture = CompletableFuture<HardwareBuffer>()
+
+            // 3. Create ImageReader
+            val usageFlags =
+                HardwareBuffer.USAGE_GPU_SAMPLED_IMAGE or
+                    HardwareBuffer.USAGE_GPU_COLOR_OUTPUT or
+                    HardwareBuffer.USAGE_CPU_READ_RARELY // Adjust as needed
+
+            imageReader =
+                ImageReader.newInstance(width, height, PixelFormat.RGBA_8888, 1, usageFlags)
+
+            // 4. Set Listener to capture the buffer
+            imageReader.setOnImageAvailableListener({ reader ->
+                var image: Image? = null
+                var hardwareBuffer: HardwareBuffer? = null
+                try {
+                    // Use `use` block for automatic image.close()
+                    image = reader.acquireLatestImage()
+                    if (image == null) {
+                        Log.w(TAG, "ImageReader listener fired but no image available.")
+                        // Complete exceptionally if buffer wasn't already completed.
+                        bufferFuture.completeExceptionally(
+                            RuntimeException("ImageReader listener fired but no image available"),
+                        )
+                        return@setOnImageAvailableListener
+                    }
+
+                    hardwareBuffer = image.hardwareBuffer
+                    if (hardwareBuffer != null) {
+                        // IMPORTANT: Don't close the HardwareBuffer here!
+                        // Transfer ownership via the CompletableFuture.
+                        if (!bufferFuture.isDone) { // Avoid completing more than once
+                            bufferFuture.complete(hardwareBuffer)
+                        } else {
+                            // Future was already completed (maybe exceptionally), close this buffer
+                            Log.w(TAG, "Future already done, closing redundant HardwareBuffer")
+                            hardwareBuffer.close()
+                        }
+                    } else {
+                        Log.e(TAG, "Failed to get HardwareBuffer from Image.")
+                        if (!bufferFuture.isDone) {
+                            bufferFuture.completeExceptionally(
+                                RuntimeException("Failed to get HardwareBuffer from Image"),
+                            )
+                        }
+                    }
+                } catch (e: Exception) {
+                    Log.e(TAG, "Error in ImageReader listener", e)
+                    if (!bufferFuture.isDone) {
+                        bufferFuture.completeExceptionally(e) // Propagate error
+                    }
+                    // If we got the buffer but failed elsewhere, ensure it's closed
+                    hardwareBuffer?.takeUnless { it.isClosed }?.close()
+                } finally {
+                    // image?.close() // Handled by acquiring reader itself or image.use{} if used
+                    image?.close() // Close image if not using `use` or if error before `use` finishes
+                }
+            }, imageReaderHandler)
+
+            // 5. Get the Surface to draw onto
+            surface =
+                imageReader.surface
+                    ?: throw RuntimeException("Failed to get Surface from ImageReader")
+
+            // 6. Lock Canvas and Draw
+            val canvas: Canvas? = surface.lockHardwareCanvas() // Use hardware accelerated canvas
+            if (canvas != null) {
+                try {
+                    // --- Your Drawing Code Here ---
+                    val paint =
+                        Paint().apply {
+                            isAntiAlias = true // Good practice
+                        }
+
+                    // Blue background
+                    paint.color = Color.BLUE
+                    canvas.drawRect(0f, 0f, width.toFloat(), height.toFloat(), paint)
+
+                    // White text
+                    paint.color = Color.WHITE
+                    paint.textSize = 40f
+                    paint.textAlign = Paint.Align.CENTER
+                    canvas.drawText(
+                        "Hello HardwareBuffer! (Kotlin)",
+                        width / 2f,
+                        height / 2f,
+                        paint,
+                    )
+                    // --- End Drawing Code ---
+                } finally {
+                    // 7. Unlock Canvas and Post
+                    surface.unlockCanvasAndPost(canvas)
+                }
+            } else {
+                throw RuntimeException("Failed to lock Hardware Canvas")
+            }
+
+            // 8. Wait for the listener to provide the HardwareBuffer
+            try {
+                // Wait for the buffer; this blocks the current thread.
+                receivedHardwareBuffer =
+                    bufferFuture.get(IMAGE_READER_TIMEOUT_MS, TimeUnit.MILLISECONDS)
+                // Ownership of receivedHardwareBuffer is now transferred to the caller
+            } catch (timeout: TimeoutException) {
+                Log.e(TAG, "Timeout waiting for HardwareBuffer from ImageReader listener")
+                bufferFuture.cancel(true) // Attempt to cancel listener processing
+                throw timeout // Re-throw
+            }
+        } catch (e: Exception) {
+            Log.e(TAG, "Failed to draw to HardwareBuffer", e)
+            // Ensure buffer is closed if acquired but an error occurred before returning it
+            receivedHardwareBuffer?.takeUnless { it.isClosed }?.close()
+            return null // Indicate failure
+        } finally {
+            // 9. Cleanup
+            try {
+                imageReader?.close() // Also releases the Surface implicitly
+            } catch (e: Exception) {
+                Log.e(TAG, "Error closing ImageReader", e)
+            }
+            try {
+                handlerThread?.quitSafely()
+            } catch (e: Exception) {
+                Log.e(TAG, "Error quitting HandlerThread", e)
+            }
+            // Note: Do NOT close receivedHardwareBuffer here if returning successfully.
+            // The caller is responsible for closing the returned buffer.
+        }
+
+        // Return the buffer; caller MUST close it.
+        return receivedHardwareBuffer
+    }
+
+    // --- Example Usage (must be called from appropriate context/thread, like a coroutine) ---
+    /*
+    @RequiresApi(Build.VERSION_CODES.O)
+    suspend fun exampleUsage() = withContext(Dispatchers.IO) { // Run blocking code off main thread
+        val myBuffer: HardwareBuffer? = CanvasToHardwareBufferUtil.drawToHardwareBuffer(640, 480)
+
+        // Use the 'use' extension function for automatic closing
+        myBuffer?.use { buffer ->
+            // ... Use the buffer (e.g., create an EGLImage, pass to Vulkan, etc.) ...
+            Log.d(TAG, "Successfully created HardwareBuffer: $buffer. Now using it...")
+            // buffer.close() // 'use' handles this automatically
+
+        } ?: run {
+             Log.e(TAG, "Failed to create HardwareBuffer.")
+        }
+
+         Log.d(TAG,"HardwareBuffer processing finished (buffer closed if obtained).")
+    }
+     */
+}

android/samples/sample-external-image/src/main/java/com/google/android/filament/externalimg/ExternalImageHelper.kt~

@@ -0,0 +1,180 @@
+import android.graphics.*
+import android.hardware.HardwareBuffer
+import android.media.Image
+import android.media.ImageReader
+import android.os.Build
+import android.os.Handler
+import android.os.HandlerThread
+import android.util.Log
+import android.view.Surface
+import androidx.annotation.RequiresApi
+import java.util.concurrent.CompletableFuture
+import java.util.concurrent.TimeUnit
+import java.util.concurrent.TimeoutException
+
+@RequiresApi(Build.VERSION_CODES.O)
+object CanvasToHardwareBufferUtil {
+
+    private const val TAG = "CanvasToHardwareBufferKt"
+    private const val IMAGE_READER_TIMEOUT_MS = 3000L // Timeout for waiting buffer
+
+    fun drawToHardwareBuffer(width: Int, height: Int): HardwareBuffer? {
+        if (width <= 0 || height <= 0) {
+            Log.e(TAG, "Invalid dimensions: width=$width, height=$height")
+            return null
+        }
+
+        var handlerThread: HandlerThread? = null
+        var imageReader: ImageReader? = null
+        var surface: Surface? = null // Keep track for logging/debugging if needed
+        // Use var as it's assigned within the try block after future completion
+        var receivedHardwareBuffer: HardwareBuffer? = null
+
+        try {
+            // 1. Setup HandlerThread for ImageReader callbacks
+            handlerThread = HandlerThread("ImageReaderThreadKt").apply { start() }
+            val imageReaderHandler = Handler(handlerThread.looper)
+
+            // 2. Use CompletableFuture to wait for the buffer from the listener
+            val bufferFuture = CompletableFuture<HardwareBuffer>()
+
+            // 3. Create ImageReader
+            val usageFlags = HardwareBuffer.USAGE_GPU_SAMPLED_IMAGE or
+                    HardwareBuffer.USAGE_GPU_COLOR_OUTPUT or
+                    HardwareBuffer.USAGE_CPU_READ_RARELY // Adjust as needed
+
+            imageReader = ImageReader.newInstance(width, height, PixelFormat.RGBA_8888, 1, usageFlags)
+
+            // 4. Set Listener to capture the buffer
+            imageReader.setOnImageAvailableListener({ reader ->
+                var image: Image? = null
+                var hardwareBuffer: HardwareBuffer? = null
+                try {
+                    // Use `use` block for automatic image.close()
+                    image = reader.acquireLatestImage()
+                    if (image == null) {
+                        Log.w(TAG, "ImageReader listener fired but no image available.")
+                        // Complete exceptionally if buffer wasn't already completed.
+                        bufferFuture.completeExceptionally(RuntimeException("ImageReader listener fired but no image available"))
+                        return@setOnImageAvailableListener
+                    }
+
+                    hardwareBuffer = image.hardwareBuffer
+                    if (hardwareBuffer != null) {
+                        // IMPORTANT: Don't close the HardwareBuffer here!
+                        // Transfer ownership via the CompletableFuture.
+                        if (!bufferFuture.isDone) { // Avoid completing more than once
+                           bufferFuture.complete(hardwareBuffer)
+                        } else {
+                            // Future was already completed (maybe exceptionally), close this buffer
+                            Log.w(TAG, "Future already done, closing redundant HardwareBuffer")
+                            hardwareBuffer.close()
+                        }
+                    } else {
+                        Log.e(TAG, "Failed to get HardwareBuffer from Image.")
+                        if (!bufferFuture.isDone) {
+                            bufferFuture.completeExceptionally(RuntimeException("Failed to get HardwareBuffer from Image"))
+                        }
+                    }
+                } catch (e: Exception) {
+                    Log.e(TAG, "Error in ImageReader listener", e)
+                    if (!bufferFuture.isDone) {
+                        bufferFuture.completeExceptionally(e) // Propagate error
+                    }
+                    // If we got the buffer but failed elsewhere, ensure it's closed
+                    hardwareBuffer?.takeUnless { it.isClosed }?.close()
+                } finally {
+                    // image?.close() // Handled by acquiring reader itself or image.use{} if used
+                     image?.close() // Close image if not using `use` or if error before `use` finishes
+                }
+            }, imageReaderHandler)
+
+            // 5. Get the Surface to draw onto
+            surface = imageReader.surface ?: throw RuntimeException("Failed to get Surface from ImageReader")
+
+            // 6. Lock Canvas and Draw
+            val canvas: Canvas? = surface.lockHardwareCanvas() // Use hardware accelerated canvas
+            if (canvas != null) {
+                try {
+                    // --- Your Drawing Code Here ---
+                    val paint = Paint().apply {
+                        isAntiAlias = true // Good practice
+                    }
+
+                    // Blue background
+                    paint.color = Color.BLUE
+                    canvas.drawRect(0f, 0f, width.toFloat(), height.toFloat(), paint)
+
+                    // White text
+                    paint.color = Color.WHITE
+                    paint.textSize = 40f
+                    paint.textAlign = Paint.Align.CENTER
+                    canvas.drawText("Hello HardwareBuffer! (Kotlin)", width / 2f, height / 2f, paint)
+                    // --- End Drawing Code ---
+
+                } finally {
+                    // 7. Unlock Canvas and Post
+                    surface.unlockCanvasAndPost(canvas)
+                }
+            } else {
+                throw RuntimeException("Failed to lock Hardware Canvas")
+            }
+
+            // 8. Wait for the listener to provide the HardwareBuffer
+            try {
+                 // Wait for the buffer; this blocks the current thread.
+                receivedHardwareBuffer = bufferFuture.get(IMAGE_READER_TIMEOUT_MS, TimeUnit.MILLISECONDS)
+                 // Ownership of receivedHardwareBuffer is now transferred to the caller
+            } catch(timeout: TimeoutException) {
+                 Log.e(TAG, "Timeout waiting for HardwareBuffer from ImageReader listener")
+                 bufferFuture.cancel(true) // Attempt to cancel listener processing
+                 throw timeout // Re-throw
+            }
+
+
+        } catch (e: Exception) {
+            Log.e(TAG, "Failed to draw to HardwareBuffer", e)
+            // Ensure buffer is closed if acquired but an error occurred before returning it
+            receivedHardwareBuffer?.takeUnless { it.isClosed }?.close()
+            return null // Indicate failure
+
+        } finally {
+            // 9. Cleanup
+            try {
+                 imageReader?.close() // Also releases the Surface implicitly
+            } catch (e: Exception) {
+                 Log.e(TAG, "Error closing ImageReader", e)
+            }
+            try {
+                 handlerThread?.quitSafely()
+            } catch (e: Exception) {
+                 Log.e(TAG, "Error quitting HandlerThread", e)
+            }
+            // Note: Do NOT close receivedHardwareBuffer here if returning successfully.
+            // The caller is responsible for closing the returned buffer.
+        }
+
+        // Return the buffer; caller MUST close it.
+        return receivedHardwareBuffer
+    }
+
+    // --- Example Usage (must be called from appropriate context/thread, like a coroutine) ---
+    /*
+    @RequiresApi(Build.VERSION_CODES.O)
+    suspend fun exampleUsage() = withContext(Dispatchers.IO) { // Run blocking code off main thread
+        val myBuffer: HardwareBuffer? = CanvasToHardwareBufferUtil.drawToHardwareBuffer(640, 480)
+
+        // Use the 'use' extension function for automatic closing
+        myBuffer?.use { buffer ->
+            // ... Use the buffer (e.g., create an EGLImage, pass to Vulkan, etc.) ...
+            Log.d(TAG, "Successfully created HardwareBuffer: $buffer. Now using it...")
+            // buffer.close() // 'use' handles this automatically
+
+        } ?: run {
+             Log.e(TAG, "Failed to create HardwareBuffer.")
+        }
+
+         Log.d(TAG,"HardwareBuffer processing finished (buffer closed if obtained).")
+    }
+    */
+}

android/samples/sample-external-image/src/main/java/com/google/android/filament/externalimg/MainActivity.kt

@@ -0,0 +1,469 @@
+/*
+ * Copyright (C) 2019 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.externalimg
+
+import android.animation.ValueAnimator
+import android.app.Activity
+import android.hardware.HardwareBuffer
+import android.opengl.Matrix
+import android.os.Bundle
+import android.view.Choreographer
+import android.view.Surface
+import android.view.SurfaceView
+import android.view.animation.LinearInterpolator
+import androidx.core.app.ActivityCompat
+
+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 com.google.android.filament.utils.ExternalImage
+import com.google.android.filament.utils.Utils
+
+import java.nio.ByteBuffer
+import java.nio.ByteOrder
+import java.nio.channels.Channels
+
+import kotlin.math.*
+
+import android.util.Log
+
+class MainActivity : Activity(), ActivityCompat.OnRequestPermissionsResultCallback {
+    companion object {
+        init {
+            Filament.init()
+        }
+    }
+
+    private var TAG = "filament.externalimg"
+
+    private lateinit var surfaceView: SurfaceView
+    private lateinit var uiHelper: UiHelper
+    private lateinit var displayHelper: DisplayHelper
+    private lateinit var choreographer: Choreographer
+
+    private lateinit var engine: Engine
+    private lateinit var renderer: Renderer
+    private lateinit var scene: Scene
+    private lateinit var view: View
+
+    // This is the Filament camera, not the phone camera. :)
+    private lateinit var camera: Camera
+
+    private var filamentTexture: Texture? = null
+
+    // Other Filament objects:
+    private lateinit var material: Material
+    private lateinit var materialInstance: MaterialInstance
+    private lateinit var vertexBuffer: VertexBuffer
+    private lateinit var indexBuffer: IndexBuffer
+
+    // Filament entity representing a renderable object
+    @Entity private var renderable = 0
+    @Entity private var light = 0
+
+    private var myCount : Int = 0
+
+    // A swap chain is Filament's representation of a surface
+    private var swapChain: SwapChain? = null
+
+    // Performs the rendering and schedules new frames
+    private val frameScheduler = FrameCallback()
+
+    private val animator = ValueAnimator.ofFloat(0.0f, 50.0f)
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        Utils.init()
+
+        surfaceView = SurfaceView(this)
+        setContentView(surfaceView)
+
+        choreographer = Choreographer.getInstance()
+
+        displayHelper = DisplayHelper(this)
+
+        setupSurfaceView()
+        setupFilament()
+        setupView()
+        setupScene()
+
+//        ExternalImage.setOnTexture(engine,, texture, buffer, srgb)
+
+//        cameraHelper = CameraHelper(this, engine, materialInstance)
+//        cameraHelper.openCamera()
+    }
+
+    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()
+        setupMaterial()
+        createMesh()
+
+        // To create a renderable we first create a generic entity
+        renderable = EntityManager.get().create()
+
+        // We then create a renderable component on that entity
+        // A renderable is made of several primitives; in this case we declare only 1
+        // If we wanted each face of the cube to have a different material, we could
+        // declare 6 primitives (1 per face) and give each of them a different material
+        // instance, setup with different parameters
+        RenderableManager.Builder(1)
+                // Overall bounding box of the renderable
+                .boundingBox(Box(0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f))
+                // Sets the mesh data of the first primitive, 6 faces of 6 indices each
+                .geometry(0, PrimitiveType.TRIANGLES, vertexBuffer, indexBuffer, 0, 6 * 6)
+                // Sets the material of the first primitive
+                .material(0, materialInstance)
+                .build(engine, renderable)
+
+        // Add the entity to the scene to render it
+        scene.addEntity(renderable)
+
+        // We now need a light, let's create a directional light
+        light = EntityManager.get().create()
+
+        // Create a color from a temperature (5,500K)
+        val (r, g, b) = Colors.cct(5_500.0f)
+        LightManager.Builder(LightManager.Type.DIRECTIONAL)
+                .color(r, g, b)
+                // Intensity of the sun in lux on a clear day
+                .intensity(110_000.0f)
+                // The direction is normalized on our behalf
+                .direction(0.0f, -0.5f, -1.0f)
+                .castShadows(true)
+                .build(engine, light)
+
+        // Add the entity to the scene to light it
+        scene.addEntity(light)
+
+        // Set the exposure on the camera, this exposure follows the sunny f/16 rule
+        // Since we've defined a light that has the same intensity as the sun, it
+        // guarantees a proper exposure
+        camera.setExposure(16.0f, 1.0f / 125.0f, 100.0f)
+
+        // Move the camera back to see the object
+        camera.lookAt(0.0, 0.0, 6.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0)
+
+        startAnimation()
+    }
+
+    private fun loadMaterial() {
+        readUncompressedAsset("materials/lit.filamat").let {
+            material = Material.Builder().payload(it, it.remaining()).build(engine)
+        }
+    }
+
+    private fun setupMaterial() {
+        materialInstance = material.createInstance()
+        materialInstance.setParameter("baseColor", Colors.RgbType.SRGB, 1.0f, 0.85f, 0.57f)
+        materialInstance.setParameter("roughness", 0.3f)
+
+        val textureTransform = FloatArray(16)
+        Matrix.setIdentityM(textureTransform, 0)
+
+        filamentTexture = Texture.Builder()
+            .sampler(Texture.Sampler.SAMPLER_EXTERNAL)
+            .width(400)
+            .height(400)        
+            .format(Texture.InternalFormat.RGBA8)
+            .build(engine)
+
+        val sampler = TextureSampler(TextureSampler.MinFilter.LINEAR, TextureSampler.MagFilter.LINEAR, TextureSampler.WrapMode.CLAMP_TO_EDGE)
+        materialInstance.setParameter("videoTexture", filamentTexture!!, sampler)
+        materialInstance.setParameter("textureTransform", MaterialInstance.FloatElement.MAT4, textureTransform, 0, 1)
+    }
+
+    private fun createMesh() {
+        val floatSize = 4
+        val shortSize = 2
+        // A vertex is a position + a tangent frame:
+        // 3 floats for XYZ position, 4 floats for normal+tangents (quaternion)
+        val vertexSize = 3 * floatSize + 4 * floatSize
+
+        // Define a vertex and a function to put a vertex in a ByteBuffer
+        @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(-1.5f, -1.5f, -1.0f, tfNZ))
+                .put(Vertex(-1.5f,  1.5f, -1.0f, tfNZ))
+                .put(Vertex( 1.5f,  1.5f, -1.0f, tfNZ))
+                .put(Vertex( 1.5f, -1.5f, -1.0f, tfNZ))
+                // Face +X
+                .put(Vertex( 1.5f, -1.5f, -1.0f, tfPX))
+                .put(Vertex( 1.5f,  1.5f, -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(-1.5f,  1.5f, -1.0f, tfNX))
+                .put(Vertex(-1.5f, -1.5f, -1.0f, tfNX))
+                // Face -Y
+                .put(Vertex(-1.0f, -1.0f,  1.0f, tfNY))
+                .put(Vertex(-1.5f, -1.5f, -1.0f, tfNY))
+                .put(Vertex( 1.5f, -1.5f, -1.0f, tfNY))
+                .put(Vertex( 1.0f, -1.0f,  1.0f, tfNY))
+                // Face +Y
+                .put(Vertex(-1.5f,  1.5f, -1.0f, tfPY))
+                .put(Vertex(-1.0f,  1.0f,  1.0f, tfPY))
+                .put(Vertex( 1.0f,  1.0f,  1.0f, tfPY))
+                .put(Vertex( 1.5f,  1.5f, -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 startAnimation() {
+        // Animate the triangle
+        animator.interpolator = LinearInterpolator()
+        animator.duration = 6000
+        animator.repeatMode = ValueAnimator.RESTART
+        animator.repeatCount = ValueAnimator.INFINITE
+        animator.addUpdateListener(object : ValueAnimator.AnimatorUpdateListener {
+            val transformMatrix = FloatArray(16)
+            override fun onAnimationUpdate(animator: ValueAnimator) {
+                val t = animator.animatedValue as Float
+                val radians = sin(t) * 3.0f * PI.toFloat()
+                Matrix.setRotateM(transformMatrix, 0, radians, 0.0f, 1.0f, 0.0f)
+                val tcm = engine.transformManager
+                tcm.setTransform(tcm.getInstance(renderable), transformMatrix)
+            }
+        })
+        animator.start()
+    }
+
+    override fun onResume() {
+        super.onResume()
+        choreographer.postFrameCallback(frameScheduler)
+        animator.start()
+//        cameraHelper.onResume()
+    }
+
+    override fun onPause() {
+        super.onPause()
+        choreographer.removeFrameCallback(frameScheduler)
+        animator.cancel()
+//        cameraHelper.onPause()
+    }
+
+    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)
+        engine.destroyEntity(renderable)
+        engine.destroyRenderer(renderer)
+        engine.destroyVertexBuffer(vertexBuffer)
+        engine.destroyIndexBuffer(indexBuffer)
+        engine.destroyMaterialInstance(materialInstance)
+        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)
+        entityManager.destroy(renderable)
+        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 (myCount < 1) {
+                    val mybuffer: HardwareBuffer? = CanvasToHardwareBufferUtil.drawToHardwareBuffer(400, 400)
+                    mybuffer?.use { buffer : HardwareBuffer ->
+                                        // ... Use the buffer (e.g., create an EGLImage, pass to Vulkan, etc.) ...
+                                    Log.d(TAG, "Successfully created HardwareBuffer: $buffer. Now using it...")
+                                    // buffer.close() // 'use' handles this automatically
+                                    ExternalImage.setOnTexture(engine, filamentTexture!!, buffer, false)                                    
+
+                    } ?: run {
+                        Log.e(TAG, "Failed to create HardwareBuffer.")
+                    }
+                }
+                myCount ++;
+
+//                cameraHelper.pushExternalImageToFilament()
+
+                // 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, 20.0, Camera.Fov.VERTICAL)
+
+            view.viewport = Viewport(0, 0, width, height)
+
+            FilamentHelper.synchronizePendingFrames(engine)
+        }
+    }
+
+    private fun readUncompressedAsset(@Suppress("SameParameterValue") 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() }
+        }
+    }
+
+    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
+//        if (!cameraHelper.onRequestPermissionsResult(requestCode, grantResults)) {
+//            this.onRequestPermissionsResult(requestCode, permissions, grantResults)
+//        }
+    }
+
+}

android/samples/sample-external-image/src/main/java/com/google/android/filament/externalimg/MainActivity.kt~

@@ -0,0 +1,446 @@
+/*
+ * Copyright (C) 2019 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.externalimg
+
+import android.animation.ValueAnimator
+import android.app.Activity
+import android.hardware.HardwareBuffer
+import android.opengl.Matrix
+import android.os.Bundle
+import android.view.Choreographer
+import android.view.Surface
+import android.view.SurfaceView
+import android.view.animation.LinearInterpolator
+import androidx.core.app.ActivityCompat
+
+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.*
+
+import android.util.Log
+
+class MainActivity : Activity(), ActivityCompat.OnRequestPermissionsResultCallback {
+    companion object {
+        init {
+            Filament.init()
+        }
+    }
+
+    private var TAG = "filament.externalimg"
+    
+    private lateinit var surfaceView: SurfaceView
+    private lateinit var uiHelper: UiHelper
+    private lateinit var displayHelper: DisplayHelper
+    private lateinit var choreographer: Choreographer
+
+    private lateinit var engine: Engine
+    private lateinit var renderer: Renderer
+    private lateinit var scene: Scene
+    private lateinit var view: View
+
+    // This is the Filament camera, not the phone camera. :)
+    private lateinit var camera: Camera
+
+    // Other Filament objects:
+    private lateinit var material: Material
+    private lateinit var materialInstance: MaterialInstance
+    private lateinit var vertexBuffer: VertexBuffer
+    private lateinit var indexBuffer: IndexBuffer
+
+    // Filament entity representing a renderable object
+    @Entity private var renderable = 0
+    @Entity private var light = 0
+
+    private var myCount : Int = 0
+
+    // A swap chain is Filament's representation of a surface
+    private var swapChain: SwapChain? = null
+
+    // Performs the rendering and schedules new frames
+    private val frameScheduler = FrameCallback()
+
+    private val animator = ValueAnimator.ofFloat(0.0f, 50.0f)
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        surfaceView = SurfaceView(this)
+        setContentView(surfaceView)
+
+        choreographer = Choreographer.getInstance()
+
+        displayHelper = DisplayHelper(this)
+
+        setupSurfaceView()
+        setupFilament()
+        setupView()
+        setupScene()
+
+//        cameraHelper = CameraHelper(this, engine, materialInstance)
+//        cameraHelper.openCamera()
+    }
+
+    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()
+        setupMaterial()
+        createMesh()
+
+        // To create a renderable we first create a generic entity
+        renderable = EntityManager.get().create()
+
+        // We then create a renderable component on that entity
+        // A renderable is made of several primitives; in this case we declare only 1
+        // If we wanted each face of the cube to have a different material, we could
+        // declare 6 primitives (1 per face) and give each of them a different material
+        // instance, setup with different parameters
+        RenderableManager.Builder(1)
+                // Overall bounding box of the renderable
+                .boundingBox(Box(0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f))
+                // Sets the mesh data of the first primitive, 6 faces of 6 indices each
+                .geometry(0, PrimitiveType.TRIANGLES, vertexBuffer, indexBuffer, 0, 6 * 6)
+                // Sets the material of the first primitive
+                .material(0, materialInstance)
+                .build(engine, renderable)
+
+        // Add the entity to the scene to render it
+        scene.addEntity(renderable)
+
+        // We now need a light, let's create a directional light
+        light = EntityManager.get().create()
+
+        // Create a color from a temperature (5,500K)
+        val (r, g, b) = Colors.cct(5_500.0f)
+        LightManager.Builder(LightManager.Type.DIRECTIONAL)
+                .color(r, g, b)
+                // Intensity of the sun in lux on a clear day
+                .intensity(110_000.0f)
+                // The direction is normalized on our behalf
+                .direction(0.0f, -0.5f, -1.0f)
+                .castShadows(true)
+                .build(engine, light)
+
+        // Add the entity to the scene to light it
+        scene.addEntity(light)
+
+        // Set the exposure on the camera, this exposure follows the sunny f/16 rule
+        // Since we've defined a light that has the same intensity as the sun, it
+        // guarantees a proper exposure
+        camera.setExposure(16.0f, 1.0f / 125.0f, 100.0f)
+
+        // Move the camera back to see the object
+        camera.lookAt(0.0, 0.0, 6.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0)
+
+        startAnimation()
+    }
+
+    private fun loadMaterial() {
+        readUncompressedAsset("materials/lit.filamat").let {
+            material = Material.Builder().payload(it, it.remaining()).build(engine)
+        }
+    }
+
+    private fun setupMaterial() {
+        materialInstance = material.createInstance()
+        materialInstance.setParameter("baseColor", Colors.RgbType.SRGB, 1.0f, 0.85f, 0.57f)
+        materialInstance.setParameter("roughness", 0.3f)
+    }
+
+    private fun createMesh() {
+        val floatSize = 4
+        val shortSize = 2
+        // A vertex is a position + a tangent frame:
+        // 3 floats for XYZ position, 4 floats for normal+tangents (quaternion)
+        val vertexSize = 3 * floatSize + 4 * floatSize
+
+        // Define a vertex and a function to put a vertex in a ByteBuffer
+        @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(-1.5f, -1.5f, -1.0f, tfNZ))
+                .put(Vertex(-1.5f,  1.5f, -1.0f, tfNZ))
+                .put(Vertex( 1.5f,  1.5f, -1.0f, tfNZ))
+                .put(Vertex( 1.5f, -1.5f, -1.0f, tfNZ))
+                // Face +X
+                .put(Vertex( 1.5f, -1.5f, -1.0f, tfPX))
+                .put(Vertex( 1.5f,  1.5f, -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(-1.5f,  1.5f, -1.0f, tfNX))
+                .put(Vertex(-1.5f, -1.5f, -1.0f, tfNX))
+                // Face -Y
+                .put(Vertex(-1.0f, -1.0f,  1.0f, tfNY))
+                .put(Vertex(-1.5f, -1.5f, -1.0f, tfNY))
+                .put(Vertex( 1.5f, -1.5f, -1.0f, tfNY))
+                .put(Vertex( 1.0f, -1.0f,  1.0f, tfNY))
+                // Face +Y
+                .put(Vertex(-1.5f,  1.5f, -1.0f, tfPY))
+                .put(Vertex(-1.0f,  1.0f,  1.0f, tfPY))
+                .put(Vertex( 1.0f,  1.0f,  1.0f, tfPY))
+                .put(Vertex( 1.5f,  1.5f, -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 startAnimation() {
+        // Animate the triangle
+        animator.interpolator = LinearInterpolator()
+        animator.duration = 6000
+        animator.repeatMode = ValueAnimator.RESTART
+        animator.repeatCount = ValueAnimator.INFINITE
+        animator.addUpdateListener(object : ValueAnimator.AnimatorUpdateListener {
+            val transformMatrix = FloatArray(16)
+            override fun onAnimationUpdate(animator: ValueAnimator) {
+                val t = animator.animatedValue as Float
+                val radians = sin(t) * 3.0f * PI.toFloat()
+                Matrix.setRotateM(transformMatrix, 0, radians, 0.0f, 1.0f, 0.0f)
+                val tcm = engine.transformManager
+                tcm.setTransform(tcm.getInstance(renderable), transformMatrix)
+            }
+        })
+        animator.start()
+    }
+
+    override fun onResume() {
+        super.onResume()
+        choreographer.postFrameCallback(frameScheduler)
+        animator.start()
+//        cameraHelper.onResume()
+    }
+
+    override fun onPause() {
+        super.onPause()
+        choreographer.removeFrameCallback(frameScheduler)
+        animator.cancel()
+//        cameraHelper.onPause()
+    }
+
+    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)
+        engine.destroyEntity(renderable)
+        engine.destroyRenderer(renderer)
+        engine.destroyVertexBuffer(vertexBuffer)
+        engine.destroyIndexBuffer(indexBuffer)
+        engine.destroyMaterialInstance(materialInstance)
+        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)
+        entityManager.destroy(renderable)
+        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 (myCount < 1) {
+                    val mybuffer: HardwareBuffer? = CanvasToHardwareBufferUtil.drawToHardwareBuffer(400, 400)
+                    mybuffer?.use { buffer : HardwareBuffer ->
+                                        // ... Use the buffer (e.g., create an EGLImage, pass to Vulkan, etc.) ...
+                                    Log.d(TAG, "Successfully created HardwareBuffer: $buffer. Now using it...")
+                                    // buffer.close() // 'use' handles this automatically
+                                    
+                    } ?: run {
+                        Log.e(TAG, "Failed to create HardwareBuffer.")
+                    }
+                }
+                myCount ++;
+                
+//                cameraHelper.pushExternalImageToFilament()
+
+                // 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, 20.0, Camera.Fov.VERTICAL)
+
+            view.viewport = Viewport(0, 0, width, height)
+
+            FilamentHelper.synchronizePendingFrames(engine)
+        }
+    }
+
+    private fun readUncompressedAsset(@Suppress("SameParameterValue") 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() }
+        }
+    }
+
+    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
+//        if (!cameraHelper.onRequestPermissionsResult(requestCode, grantResults)) {
+//            this.onRequestPermissionsResult(requestCode, permissions, grantResults)
+//        }
+    }
+
+}

android/samples/sample-external-image/src/main/materials/lit.mat

@@ -0,0 +1,73 @@
+// 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)
+
+    // Custom vertex shader outputs
+    variables : [
+        uv
+    ],
+
+    // 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 : samplerExternal,
+            name : videoTexture
+        },
+        {
+            type : mat4,
+            name : textureTransform
+        }
+    ],
+}
+
+vertex {
+    void materialVertex(inout MaterialVertexInputs material) {
+        material.uv = 0.5 * (getPosition() + vec4(1));
+    }
+}
+
+fragment {
+    void material(inout MaterialInputs material) {
+        prepareMaterial(material);
+        material.roughness = materialParams.roughness;
+        material.metallic = 0.0;
+
+        // Apply the video stream to the +Z face on the cube.
+        if (variable_uv.z >= 1.0) {
+            vec2 uv = (materialParams.textureTransform * vec4(variable_uv.xy, 0, 1)).xy;
+            material.baseColor.rgb = inverseTonemapSRGB(texture(materialParams_videoTexture, uv).rgb);
+        } else {
+            material.baseColor.rgb = materialParams.baseColor;
+        }
+    }
+}

android/samples/sample-external-image/src/main/res/drawable-v24/ic_launcher_foreground.xml

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

android/samples/sample-external-image/src/main/res/drawable/ic_launcher_background.xml

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

android/samples/sample-external-image/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

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

android/samples/sample-external-image/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

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

android/samples/sample-external-image/src/main/res/values/colors.xml

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

android/samples/sample-external-image/src/main/res/values/strings.xml

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

android/samples/sample-external-image/src/main/res/values/strings.xml~

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

android/samples/sample-external-image/src/main/res/values/styles.xml

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

android/settings.gradle

@@ -18,5 +18,6 @@ include ':samples:sample-stream-test'
 include ':samples:sample-texture-view'
 include ':samples:sample-textured-object'
 include ':samples:sample-transparent-view'
+include ':samples:sample-external-image'
 
 rootProject.name = 'filament'

build.sh

@@ -541,6 +541,7 @@ function build_android {
         ./gradlew \
             -Pcom.google.android.filament.dist-dir=../out/android-debug/filament \
             -Pcom.google.android.filament.abis=${ABI_GRADLE_OPTION} \
+            ${WEBGPU_ANDROID_GRADLE_OPTION} \
             :filamat-android:assembleDebug
 
         if [[ "${BUILD_ANDROID_SAMPLES}" == "true" ]]; then
@@ -591,6 +592,7 @@ function build_android {
         ./gradlew \
             -Pcom.google.android.filament.dist-dir=../out/android-release/filament \
             -Pcom.google.android.filament.abis=${ABI_GRADLE_OPTION} \
+            ${WEBGPU_ANDROID_GRADLE_OPTION} \
             :filamat-android:assembleRelease
 
         if [[ "${BUILD_ANDROID_SAMPLES}" == "true" ]]; then

build/linux/ci-common.sh

@@ -30,6 +30,9 @@ if [[ "$GITHUB_WORKFLOW" ]]; then
     sudo apt-get install clang-$GITHUB_CLANG_VERSION libc++-$GITHUB_CLANG_VERSION-dev libc++abi-$GITHUB_CLANG_VERSION-dev
     sudo apt-get install mesa-common-dev libxi-dev libxxf86vm-dev
 
+    # For dawn
+    sudo apt-get install libxrandr-dev libxinerama-dev libxcursor-dev libxi-dev libx11-xcb-dev
+
     sudo update-alternatives --install /usr/bin/cc cc /usr/bin/clang-${GITHUB_CLANG_VERSION} 100
     sudo update-alternatives --install /usr/bin/c++ c++ /usr/bin/clang++-${GITHUB_CLANG_VERSION} 100
 fi

docs/Materials.md.html

@@ -13,7 +13,7 @@ This document is part of the [Filament project](https://github.com/google/filame
 ## Authors
 
 - [Romain Guy](https://github.com/romainguy), [@romainguy](https://twitter.com/romainguy)
-- [Mathias Agopian](https://github.com/pixelflinger), [@darthmoosious](https://twitter.com/darthmoosious)
+- [Mathias Agopian](https://github.com/pixelflinger), [@pixelflinger](https://bsky.app/profile/pixelflinger.bsky.social)
 
 # Overview
 
@@ -78,26 +78,27 @@ in table [standardProperties].
         Property        |      Definition
 -----------------------:|:---------------------
 **baseColor**           | Diffuse albedo for non-metallic surfaces, and specular color for metallic surfaces
-**metallic**            | Whether a surface appears to be dielectric (0.0) or conductor (1.0). Often used as a binary value (0 or 1)
 **roughness**           | Perceived smoothness (1.0) or roughness (0.0) of a surface. Smooth surfaces exhibit sharp reflections
+**metallic**            | Whether a surface appears to be dielectric (0.0) or conductor (1.0). Often used as a binary value (0 or 1)
 **reflectance**         | Fresnel reflectance at normal incidence for dielectric surfaces. This directly controls the strength of the reflections
-**sheenColor**          | Strength of the sheen layer
-**sheenRoughness**      | Perceived smoothness or roughness of the sheen layer
+**ambientOcclusion**    | Defines how much of the ambient light is accessible to a surface point. It is a per-pixel shadowing factor between 0.0 and 1.0
 **clearCoat**           | Strength of the clear coat layer
 **clearCoatRoughness**  | Perceived smoothness or roughness of the clear coat layer
+**clearCoatNormal**     | A detail normal used to perturb the clear coat layer using _bump mapping_ (_normal mapping_)
 **anisotropy**          | Amount of anisotropy in either the tangent or bitangent direction
 **anisotropyDirection** | Local surface direction in tangent space
-**ambientOcclusion**    | Defines how much of the ambient light is accessible to a surface point. It is a per-pixel shadowing factor between 0.0 and 1.0
-**normal**              | A detail normal used to perturb the surface using _bump mapping_ (_normal mapping_)
-**bentNormal**          | A normal pointing in the average unoccluded direction. Can be used to improve indirect lighting quality
-**clearCoatNormal**     | A detail normal used to perturb the clear coat layer using _bump mapping_ (_normal mapping_)
-**emissive**            | Additional diffuse albedo to simulate emissive surfaces (such as neons, etc.) This property is mostly useful in an HDR pipeline with a bloom pass
-**postLightingColor**   | Additional color that can be blended with the result of the lighting computations. See `postLightingBlending`
-**ior**                 | Index of refraction, either for refractive objects or as an alternative to reflectance
-**transmission**        | Defines how much of the diffuse light of a dielectric is transmitted through the object, in other words this defines how transparent an object is
-**absorption**          | Absorption factor for refractive objects
-**microThickness**      | Thickness of the thin layer of refractive objects
 **thickness**           | Thickness of the solid volume of refractive objects
+**sheenColor**          | Strength of the sheen layer
+**sheenRoughness**      | Perceived smoothness or roughness of the sheen layer
+**emissive**            | Additional diffuse albedo to simulate emissive surfaces (such as neons, etc.) This property is mostly useful in an HDR pipeline with a bloom pass
+**normal**              | A detail normal used to perturb the surface using _bump mapping_ (_normal mapping_)
+**postLightingColor**   | Additional color that can be blended with the result of the lighting computations. See `postLightingBlending`
+**absorption**          | Absorption factor for refractive objects
+**transmission**        | Defines how much of the diffuse light of a dielectric is transmitted through the object, in other words this defines how transparent an object is
+**ior**                 | Index of refraction, either for refractive objects or as an alternative to reflectance
+**microThickness**      | Thickness of the thin layer of refractive objects
+**bentNormal**          | A normal pointing in the average unoccluded direction. Can be used to improve indirect lighting quality
+**shadowStrength**      | Strength factor between 0 and 1 for all shadows received by this material
 [Table [standardProperties]: Properties of the standard model]
 
 The type and range of each property is described in table [standardPropertiesTypes].
@@ -1272,6 +1273,9 @@ Description
       when selecting any shading model that is not `unlit`. See the shader sections of this document
       for more information on how to access these attributes from the shaders.
 
+!!! Note: Interaction with custom variables
+    When the `color` attribute is specified, only four custom variables are available instead of five.
+
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ JSON
 material {
     parameters : [
@@ -1302,7 +1306,7 @@ Type
 :    array of `string`
 
 Value
-:     Up to 4 strings, each must be a valid GLSL identifier.
+:     Up to 5 strings, each must be a valid GLSL identifier.
 
 Description
 :     Defines custom interpolants (or variables) that are output by the material's vertex shader.
@@ -1318,6 +1322,10 @@ Description
       particular if `default` is specified the default precision is used is the fragment shader
       (`mediump`) and in the vertex shader (`highp`).
 
+!!! Warning: Interaction with required attributes
+    If the `color` attribute is specified in the `required` list, then only four variables can be used
+    instead of five.
+
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ JSON
 material {
     name : Skybox,

filament/backend/CMakeLists.txt

@@ -108,8 +108,12 @@ if (FILAMENT_SUPPORTS_OPENGL AND NOT FILAMENT_USE_EXTERNAL_GLES3)
         list(APPEND SRCS src/opengl/platforms/PlatformCocoaTouchGL.mm)
         list(APPEND SRCS src/opengl/platforms/CocoaTouchExternalImage.mm)
     elseif (APPLE)
-        list(APPEND SRCS src/opengl/platforms/PlatformCocoaGL.mm)
-        list(APPEND SRCS src/opengl/platforms/CocoaExternalImage.mm)
+        if (FILAMENT_SUPPORTS_OSMESA)
+            list(APPEND SRCS src/opengl/platforms/PlatformOSMesa.cpp)
+        else()
+            list(APPEND SRCS src/opengl/platforms/PlatformCocoaGL.mm)
+            list(APPEND SRCS src/opengl/platforms/CocoaExternalImage.mm)
+        endif()
     elseif (WEBGL)
         list(APPEND SRCS src/opengl/platforms/PlatformWebGL.cpp)
     elseif (LINUX)
@@ -173,10 +177,12 @@ endif()
 if (FILAMENT_SUPPORTS_VULKAN)
     list(APPEND SRCS
             include/backend/platforms/VulkanPlatform.h
-            src/vulkan/caching/VulkanDescriptorSetManager.cpp
-            src/vulkan/caching/VulkanDescriptorSetManager.h
-            src/vulkan/caching/VulkanPipelineLayoutCache.cpp
-            src/vulkan/caching/VulkanPipelineLayoutCache.h
+            src/vulkan/VulkanDescriptorSetCache.cpp
+            src/vulkan/VulkanDescriptorSetCache.h
+            src/vulkan/VulkanDescriptorSetLayoutCache.cpp
+            src/vulkan/VulkanDescriptorSetLayoutCache.h
+            src/vulkan/VulkanPipelineLayoutCache.cpp
+            src/vulkan/VulkanPipelineLayoutCache.h
             src/vulkan/memory/ResourceManager.cpp
             src/vulkan/memory/ResourceManager.h
             src/vulkan/memory/ResourcePointer.h
@@ -233,17 +239,44 @@ if (FILAMENT_SUPPORTS_VULKAN)
     elseif (APPLE OR IOS)
         list(APPEND SRCS src/vulkan/platform/VulkanPlatformApple.mm)
     elseif (ANDROID)
-        list(APPEND SRCS src/vulkan/platform/VulkanPlatformAndroid.cpp)
+        list(APPEND SRCS
+            include/backend/platforms/VulkanPlatformAndroid.h
+            src/vulkan/platform/VulkanPlatformAndroid.cpp
+        )
     endif()
 endif()
 
 if (FILAMENT_SUPPORTS_WEBGPU)
     list(APPEND SRCS
+            include/backend/platforms/WebGPUPlatform.h
+            src/webgpu/platform/WebGPUPlatform.cpp
+            src/webgpu/WebGPUConstants.h
             src/webgpu/WebGPUDriver.cpp
             src/webgpu/WebGPUDriver.h
-            src/webgpu/WebGPUPlatform.cpp
-            src/webgpu/WebGPUPlatform.h
     )
+    if (WIN32)
+        list(APPEND SRCS src/webgpu/platform/WebGPUPlatformWindows.cpp)
+    elseif (LINUX)
+        list(APPEND SRCS src/webgpu/platform/WebGPUPlatformLinux.cpp)
+    elseif (APPLE OR IOS)
+        list(APPEND SRCS src/webgpu/platform/WebGPUPlatformApple.mm)
+    elseif (ANDROID)
+        list(APPEND SRCS src/webgpu/platform/WebGPUPlatformAndroid.cpp)
+    endif()
+
+    if (TNT_DEV)
+        set(FILAMENT_WEBGPU_IMMEDIATE_ERROR_HANDLING_DEFAULT ON)
+    else()
+        set(FILAMENT_WEBGPU_IMMEDIATE_ERROR_HANDLING_DEFAULT OFF)
+    endif()
+
+    option(FILAMENT_WEBGPU_IMMEDIATE_ERROR_HANDLING
+            "Enable immediate_error_handling for the WebGPU backend Dawn implementation"
+            ${FILAMENT_WEBGPU_IMMEDIATE_ERROR_HANDLING_DEFAULT})
+endif()
+
+if (ANDROID)
+    list(APPEND SRCS src/BackendUtilsAndroid.cpp)
 endif()
 
 # ==================================================================================================
@@ -389,9 +422,12 @@ set(LINUX_LINKER_OPTIMIZATION_FLAGS
         -Wl,--exclude-libs,bluegl
 )
 
-if (LINUX AND FILAMENT_SUPPORTS_OSMESA)
-    set(OSMESA_COMPILE_FLAGS
-        -I${FILAMENT_OSMESA_PATH}/include/GL)
+if (FILAMENT_SUPPORTS_OSMESA)
+    if (LINUX)
+        set(OSMESA_COMPILE_FLAGS -I${FILAMENT_OSMESA_PATH}/include/GL)
+    elseif (APPLE)
+        set(OSMESA_COMPILE_FLAGS -I${FILAMENT_OSMESA_PATH}/include)
+    endif()
 endif()
 
 if (MSVC)
@@ -426,6 +462,10 @@ if (FILAMENT_SUPPORTS_METAL)
     target_compile_definitions(${TARGET} PRIVATE $<$<BOOL:${FILAMENT_METAL_PROFILING}>:FILAMENT_METAL_PROFILING>)
 endif()
 
+if (FILAMENT_SUPPORTS_WEBGPU)
+    target_compile_definitions(${TARGET} PRIVATE $<$<BOOL:${FILAMENT_WEBGPU_IMMEDIATE_ERROR_HANDLING}>:FILAMENT_WEBGPU_IMMEDIATE_ERROR_HANDLING>)
+endif()
+
 target_link_libraries(${TARGET} PRIVATE
         ${OSMESA_LINKER_FLAGS}
         $<$<AND:$<PLATFORM_ID:Linux>,$<CONFIG:Release>>:${LINUX_LINKER_OPTIMIZATION_FLAGS}>
@@ -454,6 +494,7 @@ if (APPLE OR LINUX)
         test/ShaderGenerator.cpp
         test/TrianglePrimitive.cpp
         test/Arguments.cpp
+        test/Lifetimes.cpp
         test/test_FeedbackLoops.cpp
         test/test_Blit.cpp
         test/test_MissingRequiredAttributes.cpp

filament/backend/include/backend/DriverEnums.h

@@ -126,6 +126,10 @@ static_assert(MAX_VERTEX_BUFFER_COUNT <= MAX_VERTEX_ATTRIBUTE_COUNT,
 static constexpr size_t CONFIG_UNIFORM_BINDING_COUNT = 9;   // This is guaranteed by OpenGL ES.
 static constexpr size_t CONFIG_SAMPLER_BINDING_COUNT = 4;   // This is guaranteed by OpenGL ES.
 
+static constexpr uint8_t EXTERNAL_SAMPLER_DATA_INDEX_UNUSED =
+        uint8_t(-1);// Case where the descriptor set binding isnt using any external sampler state
+                     // and therefore doesn't have a valid entry.
+
 /**
  * Defines the backend's feature levels.
  */
@@ -182,6 +186,7 @@ enum class ShaderLanguage {
     SPIRV = 2,
     MSL = 3,
     METAL_LIBRARY = 4,
+    WGSL = 5,
 };
 
 static constexpr const char* shaderLanguageToString(ShaderLanguage shaderLanguage) {
@@ -196,6 +201,8 @@ static constexpr const char* shaderLanguageToString(ShaderLanguage shaderLanguag
             return "MSL";
         case ShaderLanguage::METAL_LIBRARY:
             return "Metal precompiled library";
+        case ShaderLanguage::WGSL:
+            return "WGSL";
     }
 }
 
@@ -249,21 +256,19 @@ struct DescriptorSetLayoutBinding {
     DescriptorFlags flags = DescriptorFlags::NONE;
     uint16_t count = 0;
 
+    uint8_t externalSamplerDataIndex = EXTERNAL_SAMPLER_DATA_INDEX_UNUSED;
+
     friend inline bool operator==(
             DescriptorSetLayoutBinding const& lhs,
             DescriptorSetLayoutBinding const& rhs) noexcept {
         return lhs.type == rhs.type &&
                lhs.flags == rhs.flags &&
                lhs.count == rhs.count &&
-               lhs.stageFlags == rhs.stageFlags;
+               lhs.stageFlags == rhs.stageFlags &&
+               lhs.externalSamplerDataIndex == rhs.externalSamplerDataIndex;
     }
 };
 
-struct DescriptorSetLayout {
-    utils::FixedCapacityVector<DescriptorSetLayoutBinding> bindings;
-};
-
-
 /**
  * Bitmask for selecting render buffers
  */
@@ -807,6 +812,33 @@ static constexpr bool isStencilFormat(TextureFormat format) noexcept {
     }
 }
 
+inline constexpr bool isColorFormat(TextureFormat format) noexcept {
+    switch (format) {
+        // Standard color formats
+        case TextureFormat::R8:
+        case TextureFormat::RG8:
+        case TextureFormat::RGBA8:
+        case TextureFormat::R16F:
+        case TextureFormat::RG16F:
+        case TextureFormat::RGBA16F:
+        case TextureFormat::R32F:
+        case TextureFormat::RG32F:
+        case TextureFormat::RGBA32F:
+        case TextureFormat::RGB10_A2:
+        case TextureFormat::R11F_G11F_B10F:
+        case TextureFormat::SRGB8:
+        case TextureFormat::SRGB8_A8:
+        case TextureFormat::RGB8:
+        case TextureFormat::RGB565:
+        case TextureFormat::RGB5_A1:
+        case TextureFormat::RGBA4:
+            return true;
+        default:
+            break;
+    }
+    return false;
+}
+
 static constexpr bool isUnsignedIntFormat(TextureFormat format) {
     switch (format) {
         case TextureFormat::R8UI:
@@ -938,8 +970,28 @@ enum class SamplerCompareFunc : uint8_t {
     N           //!< Never. The depth / stencil test always fails.
 };
 
+//! this API is copied from (and only applies to) the Vulkan spec.
+//! These specify YUV to RGB conversions.
+enum class SamplerYcbcrModelConversion : uint8_t {
+    RGB_IDENTITY = 0,
+    YCBCR_IDENTITY = 1,
+    YCBCR_709 = 2,
+    YCBCR_601 = 3,
+    YCBCR_2020 = 4,
+};
+
+enum class SamplerYcbcrRange : uint8_t {
+    ITU_FULL = 0,
+    ITU_NARROW = 1,
+};
+
+enum class ChromaLocation : uint8_t {
+    COSITED_EVEN = 0,
+    MIDPOINT = 1,
+};
+
 //! Sampler parameters
-struct SamplerParams { // NOLINT
+struct SamplerParams {             // NOLINT
     SamplerMagFilter filterMag      : 1;    //!< magnification filter (NEAREST)
     SamplerMinFilter filterMin      : 3;    //!< minification filter  (NEAREST)
     SamplerWrapMode wrapS           : 2;    //!< s-coordinate wrap mode (CLAMP_TO_EDGE)
@@ -994,6 +1046,7 @@ private:
         return SamplerParams::LessThan{}(lhs, rhs);
     }
 };
+
 static_assert(sizeof(SamplerParams) == 4);
 
 // The limitation to 64-bits max comes from how we store a SamplerParams in our JNI code
@@ -1001,6 +1054,93 @@ static_assert(sizeof(SamplerParams) == 4);
 static_assert(sizeof(SamplerParams) <= sizeof(uint64_t),
         "SamplerParams must be no more than 64 bits");
 
+//! Sampler parameters
+struct SamplerYcbcrConversion {// NOLINT
+    SamplerYcbcrModelConversion ycbcrModel : 4;
+    TextureSwizzle r : 4;
+    TextureSwizzle g : 4;
+    TextureSwizzle b : 4;
+    TextureSwizzle a : 4;
+    SamplerYcbcrRange ycbcrRange : 1;
+    ChromaLocation xChromaOffset : 1;
+    ChromaLocation yChromaOffset : 1;
+    SamplerMagFilter chromaFilter : 1;
+    uint8_t padding;
+
+    struct Hasher {
+        size_t operator()(const SamplerYcbcrConversion p) const noexcept {
+            // we don't use std::hash<> here, so we don't have to include <functional>
+            return *reinterpret_cast<uint32_t const*>(reinterpret_cast<char const*>(&p));
+        }
+    };
+
+    struct EqualTo {
+        bool operator()(SamplerYcbcrConversion lhs, SamplerYcbcrConversion rhs) const noexcept {
+            assert_invariant(lhs.padding == 0);
+            auto* pLhs = reinterpret_cast<uint32_t const*>(reinterpret_cast<char const*>(&lhs));
+            auto* pRhs = reinterpret_cast<uint32_t const*>(reinterpret_cast<char const*>(&rhs));
+            return *pLhs == *pRhs;
+        }
+    };
+
+    struct LessThan {
+        bool operator()(SamplerYcbcrConversion lhs, SamplerYcbcrConversion rhs) const noexcept {
+            assert_invariant(lhs.padding == 0);
+            auto* pLhs = reinterpret_cast<uint32_t const*>(reinterpret_cast<char const*>(&lhs));
+            auto* pRhs = reinterpret_cast<uint32_t const*>(reinterpret_cast<char const*>(&rhs));
+            return *pLhs < *pRhs;
+        }
+    };
+
+private:
+    friend inline bool operator == (SamplerYcbcrConversion lhs, SamplerYcbcrConversion rhs)
+            noexcept {
+        return SamplerYcbcrConversion::EqualTo{}(lhs, rhs);
+    }
+    friend inline bool operator != (SamplerYcbcrConversion lhs, SamplerYcbcrConversion rhs)
+            noexcept {
+        return  !SamplerYcbcrConversion::EqualTo{}(lhs, rhs);
+    }
+    friend inline bool operator < (SamplerYcbcrConversion lhs, SamplerYcbcrConversion rhs)
+            noexcept {
+        return SamplerYcbcrConversion::LessThan{}(lhs, rhs);
+    }
+};
+
+static_assert(sizeof(SamplerYcbcrConversion) == 4);
+
+static_assert(sizeof(SamplerYcbcrConversion) <= sizeof(uint64_t),
+        "SamplerYcbcrConversion must be no more than 64 bits");
+
+struct ExternalSamplerDatum {
+    ExternalSamplerDatum(SamplerYcbcrConversion ycbcr, SamplerParams spm, uint32_t extFmt)
+        : YcbcrConversion(ycbcr),
+          samplerParams(spm),
+          externalFormat(extFmt) {}
+    bool operator==(ExternalSamplerDatum const& rhs) const {
+        return (YcbcrConversion == rhs.YcbcrConversion && samplerParams == rhs.samplerParams &&
+                externalFormat == rhs.externalFormat);
+    }
+    struct EqualTo {
+        bool operator()(const ExternalSamplerDatum& lhs,
+                const ExternalSamplerDatum& rhs) const noexcept {
+            return (lhs.YcbcrConversion == rhs.YcbcrConversion &&
+                lhs.samplerParams == rhs.samplerParams &&
+                lhs.externalFormat == rhs.externalFormat);
+        }
+    };
+    SamplerYcbcrConversion YcbcrConversion;
+    SamplerParams samplerParams;
+    uint32_t externalFormat;
+};
+// No implicit padding allowed due to it being a hash key.
+static_assert(sizeof(ExternalSamplerDatum) == 12);
+
+struct DescriptorSetLayout {
+    utils::FixedCapacityVector<DescriptorSetLayoutBinding> bindings;
+    utils::FixedCapacityVector<ExternalSamplerDatum> externalSamplerData;
+};
+
 //! blending equation function
 enum class BlendEquation : uint8_t {
     ADD,                    //!< the fragment is added to the color buffer

filament/backend/include/backend/platforms/PlatformCocoaGL.h

@@ -33,7 +33,7 @@ public:
     PlatformCocoaGL();
     ~PlatformCocoaGL() noexcept override;
 
-    ExternalImageHandle createExternalImage(void* cvPixelBuffer) noexcept;
+    ExternalImageHandle UTILS_PUBLIC createExternalImage(void* cvPixelBuffer) noexcept;
 
 protected:
     // --------------------------------------------------------------------------------------------

filament/backend/include/backend/platforms/PlatformCocoaTouchGL.h

@@ -32,7 +32,7 @@ public:
     PlatformCocoaTouchGL();
     ~PlatformCocoaTouchGL() noexcept override;
 
-    ExternalImageHandle createExternalImage(void* cvPixelBuffer) noexcept;
+    ExternalImageHandle UTILS_PUBLIC createExternalImage(void* cvPixelBuffer) noexcept;
 
     // --------------------------------------------------------------------------------------------
     // Platform Interface

filament/backend/include/backend/platforms/PlatformEGL.h

@@ -50,7 +50,7 @@ public:
     /**
      * Creates an ExternalImage from a EGLImageKHR
      */
-    ExternalImageHandle createExternalImage(EGLImageKHR eglImage) noexcept;
+    ExternalImageHandle UTILS_PUBLIC createExternalImage(EGLImageKHR eglImage) noexcept;
 
 protected:
     // --------------------------------------------------------------------------------------------

filament/backend/include/backend/platforms/PlatformEGLAndroid.h

@@ -23,6 +23,7 @@
 #include <backend/platforms/PlatformEGL.h>
 
 #include <utils/android/PerformanceHintManager.h>
+#include <utils/compiler.h>
 
 #include <chrono>
 
@@ -43,8 +44,21 @@ public:
     PlatformEGLAndroid() noexcept;
     ~PlatformEGLAndroid() noexcept override;
 
-protected:
+    /**
+     * Creates an ExternalImage from a EGLImageKHR
+     */
+    ExternalImageHandle UTILS_PUBLIC createExternalImage(AHardwareBuffer const* buffer, bool sRGB) noexcept;
 
+    struct UTILS_PUBLIC ExternalImageDescAndroid {
+        uint32_t width;      // Texture width
+        uint32_t height;     // Texture height
+        TextureFormat format;// Texture format
+        TextureUsage usage;  // Texture usage flags
+    };
+
+    ExternalImageDescAndroid UTILS_PUBLIC getExternalImageDesc(ExternalImageHandle externalImage) noexcept;
+
+protected:
     // --------------------------------------------------------------------------------------------
     // Platform Interface
 
@@ -57,11 +71,6 @@ protected:
     Driver* createDriver(void* sharedContext,
             const Platform::DriverConfig& driverConfig) noexcept override;
 
-    /**
-     * Creates an ExternalImage from a EGLImageKHR
-     */
-    ExternalImageHandle createExternalImage(AHardwareBuffer const *buffer, bool sRGB) noexcept;
-
     // --------------------------------------------------------------------------------------------
     // OpenGLPlatform Interface
 
@@ -95,15 +104,26 @@ protected:
      */
     AcquiredImage transformAcquiredImage(AcquiredImage source) noexcept override;
 
-    bool setExternalImage(ExternalImageHandleRef externalImage, ExternalTexture* texture) noexcept override;
+    OpenGLPlatform::ExternalTexture* createExternalImageTexture() noexcept override;
+    void destroyExternalImageTexture(ExternalTexture* texture) noexcept override;
 
     struct ExternalImageEGLAndroid : public ExternalImageEGL {
         AHardwareBuffer* aHardwareBuffer = nullptr;
+        uint32_t width;      // Texture width
+        uint32_t height;     // Texture height
+        TextureFormat format;// Texture format
+        TextureUsage usage;  // Texture usage flags
         bool sRGB = false;
+
     protected:
         ~ExternalImageEGLAndroid() override;
     };
 
+    bool setExternalImage(ExternalImageHandleRef externalImage,
+            ExternalTexture* texture) noexcept override;
+    bool setImage(ExternalImageEGLAndroid const* eglExternalImage,
+            ExternalTexture* texture) noexcept;
+
 protected:
     bool makeCurrent(ContextType type,
             SwapChain* drawSwapChain,

filament/backend/include/backend/platforms/PlatformOSMesa.h

@@ -21,7 +21,12 @@
 
 #include "bluegl/BlueGL.h"
 
+#if defined(__linux__)
 #include <osmesa.h>
+#elif defined(__APPLE__)
+#undef GLAPI
+#include <GL/osmesa.h>
+#endif
 
 #include <backend/platforms/OpenGLPlatform.h>
 #include <backend/DriverEnums.h>

filament/backend/include/backend/platforms/VulkanPlatform.h

@@ -18,6 +18,7 @@
 #define TNT_FILAMENT_BACKEND_PLATFORMS_VULKANPLATFORM_H
 
 #include <backend/Platform.h>
+#include <backend/DriverEnums.h>
 
 #include <bluevk/BlueVK.h>
 
@@ -317,6 +318,11 @@ public:
          */
         uint32_t layers;
 
+        /**
+         * The numbers of samples per texel
+         */
+        VkSampleCountFlagBits samples;
+
         /**
          * The format of the external image
          */
@@ -347,22 +353,48 @@ public:
          */
         uint32_t memoryTypeBits;
     };
-    virtual ExternalImageMetadata getExternalImageMetadata(void* externalImage);
+    virtual ExternalImageMetadata getExternalImageMetadata(ExternalImageHandleRef externalImage);
 
     using ImageData = std::pair<VkImage, VkDeviceMemory>;
-    virtual ImageData createExternalImage(void* externalImage,
-            const ExternalImageMetadata& metadata);
+    virtual ImageData createExternalImageData(ExternalImageHandleRef externalImage,
+            const ExternalImageMetadata& metadata, uint32_t memoryTypeIndex,
+            VkImageUsageFlags usage);
+
+    virtual VkSampler createExternalSampler(SamplerYcbcrConversion chroma,
+            SamplerParams sampler,
+            uint32_t internalFormat);
+
+    virtual VkImageView createExternalImageView(SamplerYcbcrConversion chroma,
+            uint32_t internalFormat, VkImage image, VkImageSubresourceRange range,
+            VkImageViewType viewType, VkComponentMapping swizzle);
+
+protected:
+    virtual ExtensionSet getSwapchainInstanceExtensions() const;
+
+    using SurfaceBundle = std::tuple<VkSurfaceKHR, VkExtent2D>;
+    virtual SurfaceBundle createVkSurfaceKHR(void* nativeWindow, VkInstance instance,
+            uint64_t flags) const noexcept;
 
 private:
-    static ExtensionSet getSwapchainInstanceExtensions();
-    static ExternalImageMetadata getExternalImageMetadataImpl(void* externalImage,
+    // Platform dependent helper methods
+    static ExtensionSet getSwapchainInstanceExtensionsImpl();
+
+    static ExternalImageMetadata getExternalImageMetadataImpl(ExternalImageHandleRef externalImage,
             VkDevice device);
-    static ImageData createExternalImageImpl(void* externalImage, VkDevice device,
-            const VkAllocationCallbacks* allocator, const ExternalImageMetadata& metadata);
+
+    static ImageData createExternalImageDataImpl(ExternalImageHandleRef externalImage,
+            VkDevice device, const ExternalImageMetadata& metadata, uint32_t memoryTypeIndex,
+            VkImageUsageFlags usage);
+    static VkSampler createExternalSamplerImpl(VkDevice device,
+            SamplerYcbcrConversion chroma, SamplerParams sampler,
+            uint32_t internalFormat);
+    static VkImageView createExternalImageViewImpl(VkDevice device,
+            SamplerYcbcrConversion chroma, uint32_t internalFormat, VkImage image,
+            VkImageSubresourceRange range, VkImageViewType viewType,
+            VkComponentMapping swizzle);
 
     // Platform dependent helper methods
-    using SurfaceBundle = std::tuple<VkSurfaceKHR, VkExtent2D>;
-    static SurfaceBundle createVkSurfaceKHR(void* nativeWindow, VkInstance instance,
+    static SurfaceBundle createVkSurfaceKHRImpl(void* nativeWindow, VkInstance instance,
             uint64_t flags) noexcept;
 
     friend struct VulkanPlatformPrivate;

filament/backend/include/backend/platforms/VulkanPlatformAndroid.h

@@ -0,0 +1,71 @@
+/*
+ * 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_VULKAN_PLATFORM_ANDROID_H
+#define TNT_FILAMENT_BACKEND_PLATFORMS_VULKAN_PLATFORM_ANDROID_H
+
+#include <backend/DriverEnums.h>
+#include <backend/platforms/VulkanPlatform.h>
+
+#include <android/hardware_buffer.h>
+
+namespace filament::backend {
+
+class VulkanPlatformAndroid : public VulkanPlatform {
+public:
+    Platform::ExternalImageHandle UTILS_PUBLIC createExternalImage(AHardwareBuffer const* buffer,
+            bool sRGB) noexcept;
+
+    struct UTILS_PUBLIC ExternalImageDescAndroid {
+        uint32_t width;      // Texture width
+        uint32_t height;     // Texture height
+        TextureFormat format;// Texture format
+        TextureUsage usage;  // Texture usage flags
+    };
+
+    ExternalImageDescAndroid UTILS_PUBLIC getExternalImageDesc(
+            ExternalImageHandleRef externalImage) const noexcept;
+
+protected:
+    struct ExternalImageVulkanAndroid : public Platform::ExternalImage {
+        AHardwareBuffer* aHardwareBuffer = nullptr;
+        bool sRGB = false;
+        unsigned int width;  // Texture width
+        unsigned int height; // Texture height
+        TextureFormat format;// Texture format
+        TextureUsage usage;  // Texture usage flags
+
+    protected:
+        ~ExternalImageVulkanAndroid() override;
+    };
+
+    virtual ExternalImageMetadata getExternalImageMetadata(ExternalImageHandleRef externalImage);
+
+    using ImageData = VulkanPlatform::ImageData;
+    virtual ImageData createExternalImageData(ExternalImageHandleRef externalImage,
+            const ExternalImageMetadata& metadata, uint32_t memoryTypeIndex,
+            VkImageUsageFlags usage);
+
+    virtual ExtensionSet getSwapchainInstanceExtensions() const;
+
+    using SurfaceBundle = VulkanPlatform::SurfaceBundle;
+    virtual SurfaceBundle createVkSurfaceKHR(void* nativeWindow, VkInstance instance,
+            uint64_t flags) const noexcept;
+};
+
+}// namespace filament::backend
+
+#endif// TNT_FILAMENT_BACKEND_PLATFORMS_VULKAN_PLATFORM_ANDROID_H

filament/backend/include/backend/platforms/WebGPUPlatform.h

@@ -0,0 +1,59 @@
+/*
+ * 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_WEBGPUPLATFORM_H
+#define TNT_FILAMENT_BACKEND_PLATFORMS_WEBGPUPLATFORM_H
+
+#include <backend/Platform.h>
+
+#include <webgpu/webgpu_cpp.h>
+
+#include <cstdint>
+
+namespace filament::backend {
+
+/**
+ * A Platform interface, handling the environment-specific concerns, e.g. OS, for creating a WebGPU
+ * driver (backend).
+ */
+class WebGPUPlatform final : public Platform {
+public:
+    WebGPUPlatform();
+    ~WebGPUPlatform() override = default;
+
+    [[nodiscard]] int getOSVersion() const noexcept final { return 0; }
+
+    [[nodiscard]] wgpu::Instance& getInstance() noexcept { return mInstance; }
+
+    // either returns a valid surface or panics
+    [[nodiscard]] wgpu::Surface createSurface(void* nativeWindow, uint64_t flags);
+    // either returns a valid adapter or panics
+    [[nodiscard]] wgpu::Adapter requestAdapter(wgpu::Surface const& surface);
+    // either returns a valid device or panics
+    [[nodiscard]] wgpu::Device requestDevice(wgpu::Adapter const& adapter);
+
+protected:
+    [[nodiscard]] Driver* createDriver(void* sharedContext,
+            const Platform::DriverConfig& driverConfig) noexcept override;
+
+private:
+    // we may consider having the driver own this in the future
+    wgpu::Instance mInstance;
+};
+
+}// namespace filament::backend
+
+#endif// TNT_FILAMENT_BACKEND_PLATFORMS_WEBGPUPLATFORM_H

filament/backend/include/private/backend/BackendUtilsAndroid.h

@@ -14,29 +14,23 @@
  * limitations under the License.
  */
 
-#ifndef TNT_FILAMENT_BACKEND_WEBGPUPLATFORM_H
-#define TNT_FILAMENT_BACKEND_WEBGPUPLATFORM_H
+#ifndef TNT_FILAMENT_BACKEND_PRIVATE_BACKENDUTILSANDROID_H
+#define TNT_FILAMENT_BACKEND_PRIVATE_BACKENDUTILSANDROID_H
 
 #include <backend/DriverEnums.h>
-#include <backend/Platform.h>
-
-#include "webgpu/webgpu_cpp.h"
 
 namespace filament::backend {
 
-class WebGPUPlatform
-    final : public Platform {
-public:
+/**
+ * Maps AHardwareBuffer format to TextureFormat.
+ */
+TextureFormat mapToFilamentFormat(unsigned int format, bool isSrgbTransfer) noexcept;
 
-    int getOSVersion() const noexcept final { return 0; }
-
-    ~WebGPUPlatform() noexcept override = default;
-
-protected:
-
-    Driver* createDriver(void* sharedContext, const Platform::DriverConfig& driverConfig) noexcept override;
-};
+/**
+ * Maps AHardwareBuffer usage to TextureUsage.
+ */
+TextureUsage mapToFilamentUsage(unsigned int usage, TextureFormat format) noexcept;
 
 } // namespace filament
 
-#endif // TNT_FILAMENT_BACKEND_WEBGPUPLATFORM_H
+#endif // TNT_FILAMENT_BACKEND_PRIVATE_BACKENDUTILSANDROID_H

filament/backend/include/private/backend/DriverAPI.inc

@@ -362,6 +362,8 @@ DECL_DRIVER_API_SYNCHRONOUS_0(bool, isProtectedTexturesSupported)
 DECL_DRIVER_API_SYNCHRONOUS_0(bool, isDepthClampSupported)
 DECL_DRIVER_API_SYNCHRONOUS_0(uint8_t, getMaxDrawBuffers)
 DECL_DRIVER_API_SYNCHRONOUS_0(size_t, getMaxUniformBufferSize)
+DECL_DRIVER_API_SYNCHRONOUS_N(size_t, getMaxTextureSize, backend::SamplerType, target)
+DECL_DRIVER_API_SYNCHRONOUS_0(size_t, getMaxArrayTextureLayers)
 DECL_DRIVER_API_SYNCHRONOUS_0(math::float2, getClipSpaceParams)
 DECL_DRIVER_API_SYNCHRONOUS_N(void, setupExternalImage2, backend::Platform::ExternalImageHandleRef, image)
 DECL_DRIVER_API_SYNCHRONOUS_N(void, setupExternalImage, void*, image)

filament/backend/src/BackendUtilsAndroid.cpp

@@ -0,0 +1,98 @@
+/*
+ * 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 "private/backend/BackendUtilsAndroid.h"
+
+#include <android/hardware_buffer.h>
+
+namespace filament::backend {
+
+TextureFormat mapToFilamentFormat(unsigned int format, bool isSrgbTransfer) noexcept {
+    if (isSrgbTransfer) {
+        switch (format) {
+            case AHARDWAREBUFFER_FORMAT_R8G8B8_UNORM:
+                return TextureFormat::SRGB8;
+            default:
+                return TextureFormat::SRGB8_A8;
+        }
+    }
+    switch (format) {
+        case AHARDWAREBUFFER_FORMAT_R8G8B8A8_UNORM:
+        case AHARDWAREBUFFER_FORMAT_R8G8B8X8_UNORM:
+            return TextureFormat::RGBA8;
+        case AHARDWAREBUFFER_FORMAT_R8G8B8_UNORM:
+        case AHARDWAREBUFFER_FORMAT_Y8Cb8Cr8_420:
+            return TextureFormat::RGB8;
+        case AHARDWAREBUFFER_FORMAT_R5G6B5_UNORM:
+            return TextureFormat::RGB565;
+        case AHARDWAREBUFFER_FORMAT_R16G16B16A16_FLOAT:
+            return TextureFormat::RGBA16F;
+        case AHARDWAREBUFFER_FORMAT_R10G10B10A2_UNORM:
+            return TextureFormat::RGB10_A2;
+        case AHARDWAREBUFFER_FORMAT_D16_UNORM:
+            return TextureFormat::DEPTH16;
+        case AHARDWAREBUFFER_FORMAT_D24_UNORM:
+            return TextureFormat::DEPTH24;
+        case AHARDWAREBUFFER_FORMAT_D24_UNORM_S8_UINT:
+            return TextureFormat::DEPTH24_STENCIL8;
+        case AHARDWAREBUFFER_FORMAT_D32_FLOAT:
+            return TextureFormat::DEPTH32F;
+        case AHARDWAREBUFFER_FORMAT_D32_FLOAT_S8_UINT:
+            return TextureFormat::DEPTH32F_STENCIL8;
+        case AHARDWAREBUFFER_FORMAT_S8_UINT:
+            return TextureFormat::STENCIL8;
+        case AHARDWAREBUFFER_FORMAT_R8_UNORM:
+            return TextureFormat::R8;
+        default:
+            return TextureFormat::UNUSED;
+    }
+}
+
+TextureUsage mapToFilamentUsage(unsigned int usage, TextureFormat format) noexcept {
+    TextureUsage usageFlags = TextureUsage::NONE;
+
+    if (usage & AHARDWAREBUFFER_USAGE_GPU_SAMPLED_IMAGE) {
+        usageFlags |= TextureUsage::SAMPLEABLE;
+    }
+
+    if (usage & AHARDWAREBUFFER_USAGE_GPU_FRAMEBUFFER) {
+        if (isDepthFormat(format)) {
+            usageFlags |= TextureUsage::DEPTH_ATTACHMENT;
+        }
+        if (isStencilFormat(format)) {
+            usageFlags |= TextureUsage::STENCIL_ATTACHMENT;
+        }
+        if (isColorFormat(format)) {
+            usageFlags |= TextureUsage::COLOR_ATTACHMENT;
+        }
+    }
+
+    if (usage & AHARDWAREBUFFER_USAGE_GPU_DATA_BUFFER) {
+        usageFlags |= TextureUsage::UPLOADABLE;
+    }
+
+    if (usage & AHARDWAREBUFFER_USAGE_PROTECTED_CONTENT) {
+        usageFlags |= TextureUsage::PROTECTED;
+    }
+
+    if (usageFlags == TextureUsage::NONE) {
+        usageFlags = TextureUsage::COLOR_ATTACHMENT | TextureUsage::SAMPLEABLE;
+    }
+
+    return usageFlags;
+}
+
+} // namespace backend::filament

filament/backend/src/PlatformFactory.cpp

@@ -19,6 +19,11 @@
 #include <utils/Systrace.h>
 #include <utils/debug.h>
 
+// We need to keep this up top for the linux (X11) name collisions.
+#if defined(FILAMENT_SUPPORTS_WEBGPU)
+    #include "backend/platforms/WebGPUPlatform.h"
+#endif
+
 #if defined(__ANDROID__)
     #include <sys/system_properties.h>
     #if defined(FILAMENT_SUPPORTS_OPENGL) && !defined(FILAMENT_USE_EXTERNAL_GLES3)
@@ -30,7 +35,11 @@
     #endif
 #elif defined(__APPLE__)
     #if defined(FILAMENT_SUPPORTS_OPENGL) && !defined(FILAMENT_USE_EXTERNAL_GLES3)
-        #include <backend/platforms/PlatformCocoaGL.h>
+        #if defined(FILAMENT_SUPPORTS_OSMESA)
+            #include <backend/platforms/PlatformOSMesa.h>
+        #else
+            #include <backend/platforms/PlatformCocoaGL.h>
+        #endif
     #endif
 #elif defined(__linux__)
     #if defined(FILAMENT_SUPPORTS_X11)
@@ -55,7 +64,11 @@
 #endif
 
 #if defined(FILAMENT_DRIVER_SUPPORTS_VULKAN)
-    #include "backend/platforms/VulkanPlatform.h"
+    #if defined(__ANDROID__)
+        #include "backend/platforms/VulkanPlatformAndroid.h"
+    #else
+        #include "backend/platforms/VulkanPlatform.h"
+    #endif
 #endif
 
 #if defined (FILAMENT_SUPPORTS_METAL)
@@ -65,9 +78,6 @@ filament::backend::Platform* createDefaultMetalPlatform();
 #endif
 
 #include "noop/PlatformNoop.h"
-#if defined(FILAMENT_SUPPORTS_WEBGPU)
-    #include "webgpu/WebGPUPlatform.h"
-#endif
 
 namespace filament::backend {
 
@@ -104,7 +114,11 @@ Platform* PlatformFactory::create(Backend* backend) noexcept {
     }
     if (*backend == Backend::VULKAN) {
         #if defined(FILAMENT_DRIVER_SUPPORTS_VULKAN)
-            return new VulkanPlatform();
+            #if defined(__ANDROID__)
+                return new VulkanPlatformAndroid();
+            #else
+                return new VulkanPlatform();
+            #endif
         #else
             return nullptr;
         #endif
@@ -132,7 +146,11 @@ Platform* PlatformFactory::create(Backend* backend) noexcept {
         #elif defined(FILAMENT_IOS)
             return new PlatformCocoaTouchGL();
         #elif defined(__APPLE__)
-            return new PlatformCocoaGL();
+            #if defined(FILAMENT_SUPPORTS_OSMESA)
+                return new PlatformOSMesa();
+            #else
+                return new PlatformCocoaGL();
+            #endif
         #elif defined(__linux__)
             #if defined(FILAMENT_SUPPORTS_X11)
                 return new PlatformGLX();

filament/backend/src/metal/MetalDriver.mm

@@ -1177,6 +1177,16 @@ size_t MetalDriver::getMaxUniformBufferSize() {
     return 256 * 1024 * 1024;   // TODO: return the actual size instead of hardcoding the minspec
 }
 
+size_t MetalDriver::getMaxTextureSize(SamplerType) {
+    // TODO: return the actual size instead of hardcoding the minspec
+    return 2048;
+}
+
+size_t MetalDriver::getMaxArrayTextureLayers() {
+    // TODO: return the actual size instead of hardcoding the minspec
+    return 256;
+}
+
 void MetalDriver::updateIndexBuffer(Handle<HwIndexBuffer> ibh, BufferDescriptor&& data,
         uint32_t byteOffset) {
     FILAMENT_CHECK_PRECONDITION(data.buffer)

filament/backend/src/metal/MetalShaderCompiler.mm

@@ -138,6 +138,7 @@ bool MetalShaderCompiler::isParallelShaderCompileSupported() const noexcept {
             case ShaderLanguage::ESSL1:
             case ShaderLanguage::ESSL3:
             case ShaderLanguage::SPIRV:
+            case ShaderLanguage::WGSL:
                 break;
         }
 

filament/backend/src/noop/NoopDriver.cpp

@@ -240,6 +240,14 @@ size_t NoopDriver::getMaxUniformBufferSize() {
     return 16384u;
 }
 
+size_t NoopDriver::getMaxTextureSize(SamplerType target) {
+    return 2048u;
+}
+
+size_t NoopDriver::getMaxArrayTextureLayers() {
+    return 256u;
+}
+
 void NoopDriver::updateIndexBuffer(Handle<HwIndexBuffer> ibh, BufferDescriptor&& p,
         uint32_t byteOffset) {
     scheduleDestroy(std::move(p));

filament/backend/src/noop/PlatformNoop.cpp

@@ -20,7 +20,7 @@
 
 namespace filament::backend {
 
-Driver* PlatformNoop::createDriver(void* const sharedGLContext, const Platform::DriverConfig& driverConfig) noexcept {
+Driver* PlatformNoop::createDriver(void* sharedGLContext, const Platform::DriverConfig& driverConfig) noexcept {
     return NoopDriver::create();
 }
 

filament/backend/src/opengl/OpenGLContext.cpp

@@ -94,18 +94,22 @@ OpenGLContext::OpenGLContext(OpenGLPlatform& platform,
     }
     #endif
 
-    OpenGLContext::initExtensions(&ext, state.major, state.minor);
+    initExtensions(&ext, state.major, state.minor);
 
-    OpenGLContext::initProcs(&procs, ext, state.major, state.minor);
+    initProcs(&procs, ext, state.major, state.minor);
 
-    OpenGLContext::initBugs(&bugs, ext, state.major, state.minor,
+    initBugs(&bugs, ext, state.major, state.minor,
             state.vendor, state.renderer, state.version, state.shader);
 
     glGetIntegerv(GL_MAX_RENDERBUFFER_SIZE,             &gets.max_renderbuffer_size);
     glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS,           &gets.max_texture_image_units);
     glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS,  &gets.max_combined_texture_image_units);
+    glGetIntegerv(GL_MAX_TEXTURE_SIZE,                  &gets.max_texture_size);
+    glGetIntegerv(GL_MAX_CUBE_MAP_TEXTURE_SIZE,         &gets.max_cubemap_texture_size);
+    glGetIntegerv(GL_MAX_3D_TEXTURE_SIZE,               &gets.max_3d_texture_size);
+    glGetIntegerv(GL_MAX_ARRAY_TEXTURE_LAYERS,          &gets.max_array_texture_layers);
 
-    mFeatureLevel = OpenGLContext::resolveFeatureLevel(state.major, state.minor, ext, gets, bugs);
+    mFeatureLevel = resolveFeatureLevel(state.major, state.minor, ext, gets, bugs);
 
 #ifdef BACKEND_OPENGL_VERSION_GLES
     mShaderModel = ShaderModel::MOBILE;
@@ -177,6 +181,14 @@ OpenGLContext::OpenGLContext(OpenGLPlatform& platform,
                     << gets.max_anisotropy << '\n'
             << "GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS = "
                     << gets.max_combined_texture_image_units << '\n'
+            << "GL_MAX_TEXTURE_SIZE = "
+                    << gets.max_texture_size << '\n'
+            << "GL_MAX_CUBE_MAP_TEXTURE_SIZE = "
+                    << gets.max_cubemap_texture_size << '\n'
+            << "GL_MAX_3D_TEXTURE_SIZE = "
+                    << gets.max_3d_texture_size << '\n'
+            << "GL_MAX_ARRAY_TEXTURE_LAYERS = "
+                    << gets.max_array_texture_layers << '\n'
             << "GL_MAX_DRAW_BUFFERS = "
                     << gets.max_draw_buffers << '\n'
             << "GL_MAX_RENDERBUFFER_SIZE = "

filament/backend/src/opengl/OpenGLContext.h

@@ -203,6 +203,10 @@ public:
         GLint max_renderbuffer_size;
         GLint max_samples;
         GLint max_texture_image_units;
+        GLint max_texture_size;
+        GLint max_cubemap_texture_size;
+        GLint max_3d_texture_size;
+        GLint max_array_texture_layers;
         GLint max_transform_feedback_separate_attribs;
         GLint max_uniform_block_size;
         GLint max_uniform_buffer_bindings;

filament/backend/src/opengl/OpenGLDriver.cpp

@@ -148,8 +148,8 @@ using namespace utils;
 namespace filament::backend {
 
 Driver* OpenGLDriverFactory::create(
-        OpenGLPlatform* const platform,
-        void* const sharedGLContext,
+        OpenGLPlatform* platform,
+        void* sharedGLContext,
         const Platform::DriverConfig& driverConfig) noexcept {
     return OpenGLDriver::create(platform, sharedGLContext, driverConfig);
 }
@@ -159,10 +159,10 @@ using namespace GLUtils;
 // ------------------------------------------------------------------------------------------------
 
 UTILS_NOINLINE
-OpenGLDriver* OpenGLDriver::create(OpenGLPlatform* const platform,
-        void* const /*sharedGLContext*/, const Platform::DriverConfig& driverConfig) noexcept {
+OpenGLDriver* OpenGLDriver::create(OpenGLPlatform* platform,
+        void* /*sharedGLContext*/, const Platform::DriverConfig& driverConfig) noexcept {
     assert_invariant(platform);
-    OpenGLPlatform* const ec = platform;
+    OpenGLPlatform* ec = platform;
 
 #if 0
     // this is useful for development, but too verbose even for debug builds
@@ -230,7 +230,7 @@ OpenGLDriver* OpenGLDriver::create(OpenGLPlatform* const platform,
     constexpr size_t defaultSize = FILAMENT_OPENGL_HANDLE_ARENA_SIZE_IN_MB * 1024U * 1024U;
     Platform::DriverConfig validConfig{ driverConfig };
     validConfig.handleArenaSize = std::max(driverConfig.handleArenaSize, defaultSize);
-    OpenGLDriver* const driver = new(std::nothrow) OpenGLDriver(ec, validConfig);
+    OpenGLDriver* driver = new(std::nothrow) OpenGLDriver(ec, validConfig);
     return driver;
 }
 
@@ -2460,6 +2460,26 @@ size_t OpenGLDriver::getMaxUniformBufferSize() {
     return mContext.gets.max_uniform_block_size;
 }
 
+size_t OpenGLDriver::getMaxTextureSize(SamplerType target) {
+    switch (target) {
+        case SamplerType::SAMPLER_2D:
+        case SamplerType::SAMPLER_2D_ARRAY:
+        case SamplerType::SAMPLER_EXTERNAL:
+            return mContext.gets.max_texture_size;
+        case SamplerType::SAMPLER_CUBEMAP:
+            return mContext.gets.max_cubemap_texture_size;
+        case SamplerType::SAMPLER_3D:
+            return mContext.gets.max_3d_texture_size;
+        case SamplerType::SAMPLER_CUBEMAP_ARRAY:
+            return mContext.gets.max_cubemap_texture_size;
+    }
+    return 0;
+}
+
+size_t OpenGLDriver::getMaxArrayTextureLayers() {
+    return mContext.gets.max_array_texture_layers;
+}
+
 // ------------------------------------------------------------------------------------------------
 // Swap chains
 // ------------------------------------------------------------------------------------------------

filament/backend/src/opengl/platforms/PlatformCocoaTouchGL.mm

@@ -64,7 +64,7 @@ PlatformCocoaTouchGL::~PlatformCocoaTouchGL() noexcept {
     delete pImpl;
 }
 
-Driver* PlatformCocoaTouchGL::createDriver(void* const sharedGLContext, const Platform::DriverConfig& driverConfig) noexcept {
+Driver* PlatformCocoaTouchGL::createDriver(void* sharedGLContext, const Platform::DriverConfig& driverConfig) noexcept {
     EAGLSharegroup* sharegroup = (__bridge EAGLSharegroup*) sharedGLContext;
 
     EAGLContext *context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES3 sharegroup:sharegroup];

filament/backend/src/opengl/platforms/PlatformEGLAndroid.cpp

@@ -19,6 +19,7 @@
 #include <backend/platforms/PlatformEGL.h>
 #include <backend/platforms/PlatformEGLAndroid.h>
 
+#include <private/backend/BackendUtilsAndroid.h>
 #include <private/backend/VirtualMachineEnv.h>
 
 #include "opengl/GLUtils.h"
@@ -34,6 +35,8 @@
 #include <utils/ostream.h>
 #include <utils/Panic.h>
 #include <utils/Log.h>
+#include <utils/compiler.h>
+#include <utils/ostream.h>
 
 #include <EGL/egl.h>
 #include <EGL/eglext.h>
@@ -231,26 +234,133 @@ Driver* PlatformEGLAndroid::createDriver(void* sharedContext,
     return driver;
 }
 
-PlatformEGLAndroid::ExternalImageEGLAndroid::~ExternalImageEGLAndroid() = default;
+PlatformEGLAndroid::ExternalImageEGLAndroid::~ExternalImageEGLAndroid() {
+    if (__builtin_available(android 26, *)) {
+        if (aHardwareBuffer) {
+            AHardwareBuffer_release(aHardwareBuffer);
+        }
+    }
+}
 
-Platform::ExternalImageHandle PlatformEGLAndroid::createExternalImage(AHardwareBuffer const* buffer, bool sRGB) noexcept {
-    auto* const p = new(std::nothrow) ExternalImageEGLAndroid;
-    p->aHardwareBuffer = const_cast<AHardwareBuffer*>(buffer);
-    p->sRGB = sRGB;
-    return ExternalImageHandle{ p };
+Platform::ExternalImageHandle PlatformEGLAndroid::createExternalImage(AHardwareBuffer const* buffer,
+        bool sRGB) noexcept {
+    if (__builtin_available(android 26, *)) {
+        auto* const p = new (std::nothrow) ExternalImageEGLAndroid;
+        auto hardwareBuffer = const_cast<AHardwareBuffer*>(buffer);
+        AHardwareBuffer_acquire(hardwareBuffer);
+        p->aHardwareBuffer = hardwareBuffer;
+        p->sRGB = sRGB;
+        AHardwareBuffer_Desc hardwareBufferDescription = {};
+        AHardwareBuffer_describe(hardwareBuffer, &hardwareBufferDescription);
+        p->height = hardwareBufferDescription.height;
+        p->width = hardwareBufferDescription.width;
+        auto textureFormat = mapToFilamentFormat(hardwareBufferDescription.format, sRGB);
+        p->usage = mapToFilamentUsage(hardwareBufferDescription.usage, textureFormat);
+        return ExternalImageHandle{ p };
+    }
+
+    return Platform::ExternalImageHandle{};
+}
+
+PlatformEGLAndroid::ExternalImageDescAndroid PlatformEGLAndroid::getExternalImageDesc(
+        ExternalImageHandle externalImage) noexcept {
+    auto const* const eglExternalImage =
+            static_cast<ExternalImageEGLAndroid const*>(externalImage.get());
+    ExternalImageDescAndroid metadata = {};
+    if (!eglExternalImage) {
+        return metadata;
+    }
+    metadata.height = eglExternalImage->height;
+    metadata.width = eglExternalImage->width;
+    metadata.format = eglExternalImage->format;
+    metadata.usage = eglExternalImage->usage;
+    return metadata;
 }
 
 bool PlatformEGLAndroid::setExternalImage(ExternalImageHandleRef externalImage,
         UTILS_UNUSED_IN_RELEASE ExternalTexture* texture) noexcept {
-    auto const* const eglExternalImage = static_cast<ExternalImageEGLAndroid const*>(externalImage.get());
+    auto const* const eglExternalImage =
+            static_cast<ExternalImageEGLAndroid const*>(externalImage.get());
     if (eglExternalImage->aHardwareBuffer) {
-        // TODO: implement PlatformEGLAndroid::setExternalImage w/ AHardwareBuffer
-        return true;
+        return PlatformEGLAndroid::setImage(eglExternalImage, texture);
     }
     // not a AHardwareBuffer, fallback to the inherited version
     return PlatformEGL::setExternalImage(externalImage, texture);
 }
 
+OpenGLPlatform::ExternalTexture* PlatformEGLAndroid::createExternalImageTexture() noexcept {
+    ExternalTexture* outTexture = new (std::nothrow) ExternalTexture{};
+    glGenTextures(1, &outTexture->id);
+    return outTexture;
+}
+
+void PlatformEGLAndroid::destroyExternalImageTexture(ExternalTexture* texture) noexcept {
+    glDeleteTextures(1, &texture->id);
+    delete texture;
+}
+
+bool PlatformEGLAndroid::setImage(ExternalImageEGLAndroid const* eglExternalImage,
+        UTILS_UNUSED_IN_RELEASE ExternalTexture* texture) noexcept {
+    AHardwareBuffer* hardwareBuffer = eglExternalImage->aHardwareBuffer;
+
+    // Get the EGL client buffer from AHardwareBuffer
+    EGLClientBuffer clientBuffer = eglGetNativeClientBufferANDROID(hardwareBuffer);
+    EGLint imageAttrs[] = {
+        EGL_IMAGE_PRESERVED_KHR, EGL_TRUE,
+        EGL_NONE, EGL_NONE,  // Reserve space
+        EGL_NONE, EGL_NONE,  // Reserve space
+        EGL_NONE             // Ensure the list always ends with EGL_NONE
+    };
+    int attrIndex = 2;
+    if (eglExternalImage->sRGB) {
+        imageAttrs[attrIndex++] = EGL_GL_COLORSPACE;
+        imageAttrs[attrIndex++] = EGL_GL_COLORSPACE_SRGB;
+    }
+
+    if (static_cast<bool>(eglExternalImage->usage & TextureUsage::PROTECTED)) {
+        imageAttrs[attrIndex++] = EGL_PROTECTED_CONTENT_EXT;
+        imageAttrs[attrIndex++] = EGL_TRUE;
+    }
+    // Create an EGLImage from the client buffer
+    EGLImageKHR eglImage = eglCreateImageKHR(eglGetCurrentDisplay(), EGL_NO_CONTEXT,
+            EGL_NATIVE_BUFFER_ANDROID, clientBuffer, imageAttrs);
+    if (eglImage == EGL_NO_IMAGE_KHR) {
+        // Handle error
+        slog.e << "Failed to create EGL image" << io::endl;
+        glDeleteTextures(1, &texture->id);
+        return false;
+    }
+
+    // Create and bind the OpenGL texture
+    GLint prevActiveTexture, prevTexture;
+    glGetIntegerv(GL_ACTIVE_TEXTURE, &prevActiveTexture);
+    glGetIntegerv(GL_TEXTURE_BINDING_2D, &prevTexture);
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(texture->target, texture->id);
+    GLenum error = glGetError();
+    if (UTILS_UNLIKELY(error != GL_NO_ERROR)) {
+        slog.e << "Error after glBindTexture: " << error << io::endl;
+        glDeleteTextures(1, &texture->id);
+        eglDestroyImageKHR(eglGetCurrentDisplay(), eglImage);
+        glActiveTexture(prevActiveTexture);
+        glBindTexture(GL_TEXTURE_2D, prevTexture);
+        return false;
+    }
+    glEGLImageTargetTexture2DOES(texture->target, static_cast<GLeglImageOES>(eglImage));
+    error = glGetError();
+    if (UTILS_UNLIKELY(error != GL_NO_ERROR)) {
+        slog.e << "Error after glEGLImageTargetTexture2DOES: " << error << io::endl;
+        glDeleteTextures(1, &texture->id);
+        eglDestroyImageKHR(eglGetCurrentDisplay(), eglImage);
+        glActiveTexture(prevActiveTexture);
+        glBindTexture(GL_TEXTURE_2D, prevTexture);
+        return false;
+    }
+    glActiveTexture(prevActiveTexture);
+    glBindTexture(GL_TEXTURE_2D, prevTexture);
+    return true;
+}
+
 void PlatformEGLAndroid::setPresentationTime(int64_t presentationTimeInNanosecond) noexcept {
     EGLSurface currentDrawSurface = eglGetCurrentSurface(EGL_DRAW);
     if (currentDrawSurface != EGL_NO_SURFACE) {

filament/backend/src/opengl/platforms/PlatformGLX.cpp

@@ -128,7 +128,7 @@ namespace filament::backend {
 
 using namespace backend;
 
-Driver* PlatformGLX::createDriver(void* const sharedGLContext,
+Driver* PlatformGLX::createDriver(void* sharedGLContext,
         const DriverConfig& driverConfig) noexcept {
     loadLibraries();
     // Get the display device

filament/backend/src/opengl/platforms/PlatformOSMesa.cpp

@@ -22,6 +22,12 @@
 #include <dlfcn.h>
 #include <memory>
 
+#if defined(__linux__)
+// This is to ensure that linking during compilation will not fail even if
+// OSMesaGetProcAddress is not linked.
+__attribute__((weak)) OSMESAproc OSMesaGetProcAddress(char const*);
+#endif
+
 namespace filament::backend {
 
 using namespace backend;
@@ -44,20 +50,27 @@ struct OSMesaSwapchain {
 
 struct OSMesaAPI {
 private:
-    using CreateContextFunc = OSMesaContext (*)(GLenum format, OSMesaContext);
+    using CreateContextAttribsFunc = OSMesaContext (*)(const int *, OSMesaContext);
     using DestroyContextFunc = GLboolean (*)(OSMesaContext);
     using MakeCurrentFunc = GLboolean (*)(OSMesaContext ctx, void* buffer, GLenum type,
             GLsizei width, GLsizei height);
     using GetProcAddressFunc = OSMESAproc (*)(const char* funcName);
 
 public:
-    CreateContextFunc OSMesaCreateContext;
-    DestroyContextFunc OSMesaDestroyContext;
-    MakeCurrentFunc OSMesaMakeCurrent;
-    GetProcAddressFunc OSMesaGetProcAddress;
+    CreateContextAttribsFunc fOSMesaCreateContextAttribs;
+    DestroyContextFunc fOSMesaDestroyContext;
+    MakeCurrentFunc fOSMesaMakeCurrent;
+    GetProcAddressFunc fOSMesaGetProcAddress;
 
     OSMesaAPI() {
-        constexpr char const* libraryNames[] = {"libOSMesa.so", "libosmesa.so"};
+        static constexpr char const* libraryNames[] = {
+#if defined(__linux__)
+            "libOSMesa.so",
+            "libosmesa.so",
+#elif defined(__APPLE__)
+            "libOSMesa.dylib",
+#endif
+        };
         for (char const* libName: libraryNames) {
             mLib = dlopen(libName, RTLD_GLOBAL | RTLD_NOW);
             if (mLib) {
@@ -65,18 +78,27 @@ public:
             }
         }
         if (mLib) {
-            OSMesaGetProcAddress = (GetProcAddressFunc) dlsym(mLib, "OSMesaGetProcAddress");
-        } else {
-            OSMesaGetProcAddress = (GetProcAddressFunc) dlsym(RTLD_LOCAL, "OSMesaGetProcAddress");
+            // Loading from a libosmesa.os
+            fOSMesaGetProcAddress = (GetProcAddressFunc) dlsym(mLib, "OSMesaGetProcAddress");
         }
+#if defined(__linux__)
+        else {
+            // Filament is built into a .so
+            fOSMesaGetProcAddress = (GetProcAddressFunc) dlsym(RTLD_LOCAL, "OSMesaGetProcAddress");
+        }
+        if (!fOSMesaGetProcAddress) {
+            // Statically linking osmesa
+            fOSMesaGetProcAddress = OSMesaGetProcAddress;
+        }
+#endif // __linux__
 
-        FILAMENT_CHECK_PRECONDITION(OSMesaGetProcAddress)
-                << "Unable to against libOSMesa to create a software GL context";
+        FILAMENT_CHECK_PRECONDITION(fOSMesaGetProcAddress)
+                << "Unable to link against libOSMesa to create a software GL context";
 
-        OSMesaCreateContext = (CreateContextFunc) OSMesaGetProcAddress("OSMesaCreateContext");
-        OSMesaDestroyContext =
-                (DestroyContextFunc) OSMesaGetProcAddress("OSMesaDestroyContext");
-        OSMesaMakeCurrent = (MakeCurrentFunc) OSMesaGetProcAddress("OSMesaMakeCurrent");
+        fOSMesaCreateContextAttribs =
+                (CreateContextAttribsFunc) fOSMesaGetProcAddress("OSMesaCreateContextAttribs");
+        fOSMesaDestroyContext = (DestroyContextFunc) fOSMesaGetProcAddress("OSMesaDestroyContext");
+        fOSMesaMakeCurrent = (MakeCurrentFunc) fOSMesaGetProcAddress("OSMesaMakeCurrent");
     }
 
     ~OSMesaAPI() {
@@ -90,14 +112,24 @@ private:
 
 }// anonymous namespace
 
-Driver* PlatformOSMesa::createDriver(void* const sharedGLContext,
+Driver* PlatformOSMesa::createDriver(void* sharedGLContext,
         const DriverConfig& driverConfig) noexcept {
+
     OSMesaAPI* api = new OSMesaAPI();
     mOsMesaApi = api;
 
+    static constexpr int attribs[] = {
+        OSMESA_FORMAT, GL_RGBA,
+        OSMESA_DEPTH_BITS, 24,
+        OSMESA_STENCIL_BITS, 8,
+        OSMESA_ACCUM_BITS, 0,
+        OSMESA_PROFILE, OSMESA_CORE_PROFILE,
+        0,
+    };
+
     FILAMENT_CHECK_PRECONDITION(sharedGLContext == nullptr)
             << "shared GL context is not supported with PlatformOSMesa";
-    mContext = api->OSMesaCreateContext(GL_RGBA, NULL);
+    mContext = api->fOSMesaCreateContextAttribs(attribs, NULL);
 
     // We need to do a no-op makecurrent here so that the context will be in a correct state before
     // any GL calls.
@@ -113,7 +145,7 @@ Driver* PlatformOSMesa::createDriver(void* const sharedGLContext,
 
 void PlatformOSMesa::terminate() noexcept {
     OSMesaAPI* api = (OSMesaAPI*) mOsMesaApi;
-    api->OSMesaDestroyContext(mContext);
+    api->fOSMesaDestroyContext(mContext);
     delete api;
     mOsMesaApi = nullptr;
 
@@ -141,7 +173,7 @@ bool PlatformOSMesa::makeCurrent(ContextType type, SwapChain* drawSwapChain,
     OSMesaAPI* api = (OSMesaAPI*) mOsMesaApi;
     OSMesaSwapchain* impl = (OSMesaSwapchain*) drawSwapChain;
 
-    auto result = api->OSMesaMakeCurrent(mContext, (BackingType*) impl->buffer.get(),
+    auto result = api->fOSMesaMakeCurrent(mContext, (BackingType*) impl->buffer.get(),
             BACKING_GL_TYPE, impl->width, impl->height);
     FILAMENT_CHECK_POSTCONDITION(result == GL_TRUE) << "OSMesaMakeCurrent failed!";
 

filament/backend/src/opengl/platforms/PlatformWGL.cpp

@@ -75,7 +75,7 @@ struct WGLSwapChain {
 
 static PFNWGLCREATECONTEXTATTRIBSARBPROC wglCreateContextAttribs = nullptr;
 
-Driver* PlatformWGL::createDriver(void* const sharedGLContext,
+Driver* PlatformWGL::createDriver(void* sharedGLContext,
         const Platform::DriverConfig& driverConfig) noexcept {
     int result = 0;
     int pixelFormat = 0;

filament/backend/src/opengl/platforms/PlatformWebGL.cpp

@@ -20,7 +20,7 @@ namespace filament::backend {
 
 using namespace backend;
 
-Driver* PlatformWebGL::createDriver(void* const sharedGLContext,
+Driver* PlatformWebGL::createDriver(void* sharedGLContext,
         const Platform::DriverConfig& driverConfig) noexcept {
     return OpenGLPlatform::createDefaultDriver(this, sharedGLContext, driverConfig);
 }

filament/backend/src/vulkan/VulkanConstants.h

@@ -93,7 +93,7 @@
 #endif
 
 #ifndef NDEBUG
-#define FVK_DEBUG_FLAGS (FVK_DEBUG_PERFORMANCE | FVK_DEBUG_FORWARDED_FLAG)
+#define FVK_DEBUG_FLAGS (FVK_DEBUG_PERFORMANCE | FVK_DEBUG_FORWARDED_FLAG | FVK_DEBUG_VALIDATION)
 #else
 #define FVK_DEBUG_FLAGS 0
 #endif

filament/backend/src/vulkan/VulkanDescriptorSetCache.cpp

@@ -14,35 +14,25 @@
  * limitations under the License.
  */
 
-#include "VulkanDescriptorSetManager.h"
+#include "VulkanDescriptorSetCache.h"
 
-#include "vulkan/VulkanCommands.h"
-#include "vulkan/VulkanHandles.h"
-#include "vulkan/VulkanConstants.h"
+#include "VulkanCommands.h"
+#include "VulkanHandles.h"
+#include "VulkanConstants.h"
 
 #include <utils/FixedCapacityVector.h>
 #include <utils/Panic.h>
 
-#include <math.h>
-
 #include <algorithm>
 #include <memory>
-#include <type_traits>
 #include <vector>
 
 namespace filament::backend {
 
 namespace {
 
-using BitmaskGroup = VulkanDescriptorSetLayout::Bitmask;
 using DescriptorCount = VulkanDescriptorSetLayout::Count;
-using DescriptorSetLayoutArray = VulkanDescriptorSetManager::DescriptorSetLayoutArray;
-using BitmaskGroupHashFn = utils::hash::MurmurHashFn<BitmaskGroup>;
-struct BitmaskGroupEqual {
-    bool operator()(BitmaskGroup const& k1, BitmaskGroup const& k2) const {
-        return k1 == k2;
-    }
-};
+using DescriptorSetLayoutArray = VulkanDescriptorSetCache::DescriptorSetLayoutArray;
 
 // We create a pool for each layout as defined by the number of descriptors of each type. For
 // example, a layout of
@@ -199,72 +189,12 @@ struct Equal {
     }
 };
 
-template<typename Bitmask>
-uint32_t createBindings(VkDescriptorSetLayoutBinding* toBind, uint32_t count, VkDescriptorType type,
-        Bitmask const& mask) {
-    Bitmask alreadySeen;
-    mask.forEachSetBit([&](size_t index) {
-        VkShaderStageFlags stages = 0;
-        uint32_t binding = 0;
-        if (index < fvkutils::getFragmentStageShift<Bitmask>()) {
-            binding = (uint32_t) index;
-            stages |= VK_SHADER_STAGE_VERTEX_BIT;
-            auto fragIndex = index + fvkutils::getFragmentStageShift<Bitmask>();
-            if (mask.test(fragIndex)) {
-                stages |= VK_SHADER_STAGE_FRAGMENT_BIT;
-                alreadySeen.set(fragIndex);
-            }
-        } else if (!alreadySeen.test(index)) {
-            // We are in fragment stage bits
-            binding = (uint32_t) (index - fvkutils::getFragmentStageShift<Bitmask>());
-            stages |= VK_SHADER_STAGE_FRAGMENT_BIT;
-        }
-
-        if (stages) {
-            toBind[count++] = {
-                .binding = binding,
-                .descriptorType = type,
-                .descriptorCount = 1,
-                .stageFlags = stages,
-            };
-        }
-    });
-    return count;
-}
-
-inline VkDescriptorSetLayout createLayout(VkDevice device, BitmaskGroup const& bitmaskGroup) {
-    // Note that the following *needs* to be static so that VkDescriptorSetLayoutCreateInfo will not
-    // refer to stack memory.
-    VkDescriptorSetLayoutBinding toBind[VulkanDescriptorSetLayout::MAX_BINDINGS];
-    uint32_t count = 0;
-
-    count = createBindings(toBind, count, VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC,
-            bitmaskGroup.dynamicUbo);
-    count = createBindings(toBind, count, VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, bitmaskGroup.ubo);
-    count = createBindings(toBind, count, VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
-            bitmaskGroup.sampler);
-    count = createBindings(toBind, count, VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT,
-            bitmaskGroup.inputAttachment);
-
-    assert_invariant(count != 0 && "Need at least one binding for descriptor set layout.");
-    VkDescriptorSetLayoutCreateInfo dlinfo = {
-            .sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO,
-            .pNext = nullptr,
-            .bindingCount = count,
-            .pBindings = toBind,
-    };
-
-    VkDescriptorSetLayout layout;
-    vkCreateDescriptorSetLayout(device, &dlinfo, VKALLOC, &layout);
-    return layout;
-}
-
 } // anonymous namespace
 
 // This is an ever-expanding pool of sets where it
 //    1. Keeps a list of smaller pools of different layout-dimensions.
 //    2. Will add a pool if existing pool are not compatible with the requested layout o runs out.
-class VulkanDescriptorSetManager::DescriptorInfinitePool {
+class VulkanDescriptorSetCache::DescriptorInfinitePool {
 private:
     static constexpr uint16_t EXPECTED_SET_COUNT = 10;
     static constexpr float SET_COUNT_GROWTH_FACTOR = 1.5;
@@ -319,61 +249,34 @@ private:
     std::vector<std::unique_ptr<DescriptorPool>> mPools;
 };
 
-class VulkanDescriptorSetManager::DescriptorSetLayoutManager {
-public:
-    DescriptorSetLayoutManager(VkDevice device)
-        : mDevice(device) {}
 
-    VkDescriptorSetLayout getVkLayout(VulkanDescriptorSetLayout::Bitmask const& bitmasks) {
-        if (auto itr = mVkLayouts.find(bitmasks); itr != mVkLayouts.end()) {
-            return itr->second;
-        }
-        auto vklayout = createLayout(mDevice, bitmasks);
-        mVkLayouts[bitmasks] = vklayout;
-        return vklayout;
-    }
-
-    ~DescriptorSetLayoutManager() {
-        for (auto& itr: mVkLayouts) {
-            vkDestroyDescriptorSetLayout(mDevice, itr.second, VKALLOC);
-        }
-    }
-
-private:
-    VkDevice mDevice;
-    tsl::robin_map<BitmaskGroup, VkDescriptorSetLayout, BitmaskGroupHashFn, BitmaskGroupEqual>
-            mVkLayouts;
-};
-
-VulkanDescriptorSetManager::VulkanDescriptorSetManager(VkDevice device,
+VulkanDescriptorSetCache::VulkanDescriptorSetCache(VkDevice device,
         fvkmemory::ResourceManager* resourceManager)
     : mDevice(device),
       mResourceManager(resourceManager),
-      mLayoutManager(std::make_unique<DescriptorSetLayoutManager>(device)),
       mDescriptorPool(std::make_unique<DescriptorInfinitePool>(device)) {}
 
-VulkanDescriptorSetManager::~VulkanDescriptorSetManager() = default;
+VulkanDescriptorSetCache::~VulkanDescriptorSetCache() = default;
 
-void VulkanDescriptorSetManager::terminate() noexcept{
-    mLayoutManager.reset();
+void VulkanDescriptorSetCache::terminate() noexcept{
     mDescriptorPool.reset();
     clearHistory();
 }
 
 // bind() is not really binding the set but just stashing until we have all the info
 // (pipelinelayout).
-void VulkanDescriptorSetManager::bind(uint8_t setIndex,
+void VulkanDescriptorSetCache::bind(uint8_t setIndex,
         fvkmemory::resource_ptr<VulkanDescriptorSet> set,
         backend::DescriptorSetOffsetArray&& offsets) {
     set->setOffsets(std::move(offsets));
     mStashedSets[setIndex] = set;
 }
 
-void VulkanDescriptorSetManager::unbind(uint8_t setIndex) {
+void VulkanDescriptorSetCache::unbind(uint8_t setIndex) {
     mStashedSets[setIndex] = {};
 }
 
-void VulkanDescriptorSetManager::commit(VulkanCommandBuffer* commands,
+void VulkanDescriptorSetCache::commit(VulkanCommandBuffer* commands,
         VkPipelineLayout pipelineLayout, fvkutils::DescriptorSetMask const& setMask) {
     // setMask indicates the set of descriptor sets the driver wants to bind, curMask is the
     // actual set of sets that *needs* to be bound.
@@ -412,7 +315,7 @@ void VulkanDescriptorSetManager::commit(VulkanCommandBuffer* commands,
     };
 }
 
-void VulkanDescriptorSetManager::updateBuffer(fvkmemory::resource_ptr<VulkanDescriptorSet> set,
+void VulkanDescriptorSetCache::updateBuffer(fvkmemory::resource_ptr<VulkanDescriptorSet> set,
         uint8_t binding, fvkmemory::resource_ptr<VulkanBufferObject> bufferObject,
         VkDeviceSize offset, VkDeviceSize size) noexcept {
     VkDescriptorBufferInfo const info = {
@@ -438,7 +341,7 @@ void VulkanDescriptorSetManager::updateBuffer(fvkmemory::resource_ptr<VulkanDesc
     set->acquire(bufferObject);
 }
 
-void VulkanDescriptorSetManager::updateSampler(fvkmemory::resource_ptr<VulkanDescriptorSet> set,
+void VulkanDescriptorSetCache::updateSampler(fvkmemory::resource_ptr<VulkanDescriptorSet> set,
         uint8_t binding, fvkmemory::resource_ptr<VulkanTexture> texture,
         VkSampler sampler) noexcept {
     VkDescriptorImageInfo info{
@@ -470,13 +373,13 @@ void VulkanDescriptorSetManager::updateSampler(fvkmemory::resource_ptr<VulkanDes
     set->acquire(texture);
 }
 
-void VulkanDescriptorSetManager::updateInputAttachment(
+void VulkanDescriptorSetCache::updateInputAttachment(
         fvkmemory::resource_ptr<VulkanDescriptorSet> set,
         VulkanAttachment const& attachment) noexcept {
-    // TOOD: fill-in this region
+    // TOOD: fill this in.
 }
 
-fvkmemory::resource_ptr<VulkanDescriptorSet> VulkanDescriptorSetManager::createSet(
+fvkmemory::resource_ptr<VulkanDescriptorSet> VulkanDescriptorSetCache::createSet(
         Handle<HwDescriptorSet> handle, fvkmemory::resource_ptr<VulkanDescriptorSetLayout> layout) {
     auto const vkSet = mDescriptorPool->obtainSet(layout);
     auto const& count = layout->count;
@@ -492,12 +395,7 @@ fvkmemory::resource_ptr<VulkanDescriptorSet> VulkanDescriptorSetManager::createS
             });
 }
 
-void VulkanDescriptorSetManager::initVkLayout(
-        fvkmemory::resource_ptr<VulkanDescriptorSetLayout> layout) {
-    layout->setVkLayout(mLayoutManager->getVkLayout(layout->bitmask));
-}
-
-void VulkanDescriptorSetManager::clearHistory() {
+void VulkanDescriptorSetCache::clearHistory() {
     mStashedSets = {};
 }
 

filament/backend/src/vulkan/VulkanDescriptorSetCache.h

@@ -14,10 +14,10 @@
  * limitations under the License.
  */
 
-#ifndef TNT_FILAMENT_BACKEND_CACHING_VULKANDESCRIPTORSETMANAGER_H
-#define TNT_FILAMENT_BACKEND_CACHING_VULKANDESCRIPTORSETMANAGER_H
+#ifndef TNT_FILAMENT_BACKEND_CACHING_VULKANDESCRIPTORSETCACHE_H
+#define TNT_FILAMENT_BACKEND_CACHING_VULKANDESCRIPTORSETCACHE_H
 
-#include "vulkan/VulkanHandles.h"
+#include "VulkanHandles.h"
 #include "vulkan/memory/ResourcePointer.h"
 #include "vulkan/utils/Definitions.h"  // For DescriptorSetMask
 
@@ -34,20 +34,16 @@
 
 namespace filament::backend {
 
-// [GDSR]: Great-Descriptor-Set-Refactor: As of 03/20/24, the Filament frontend is planning to
-// introduce descriptor set. This PR will arrive before that change is complete. As such, some of
-// the methods introduced here will be obsolete, and certain logic will be generalized.
-
-// Abstraction over the pool and the layout cache.
-class VulkanDescriptorSetManager {
+// Abstraction over the descriptor set pool.
+class VulkanDescriptorSetCache {
 public:
     static constexpr uint8_t UNIQUE_DESCRIPTOR_SET_COUNT =
             VulkanDescriptorSetLayout::UNIQUE_DESCRIPTOR_SET_COUNT;
 
     using DescriptorSetLayoutArray = VulkanDescriptorSetLayout::DescriptorSetLayoutArray;
 
-    VulkanDescriptorSetManager(VkDevice device, fvkmemory::ResourceManager* resourceManager);
-    ~VulkanDescriptorSetManager();
+    VulkanDescriptorSetCache(VkDevice device, fvkmemory::ResourceManager* resourceManager);
+    ~VulkanDescriptorSetCache();
 
     void terminate() noexcept;
 
@@ -72,12 +68,9 @@ public:
     fvkmemory::resource_ptr<VulkanDescriptorSet> createSet(Handle<HwDescriptorSet> handle,
             fvkmemory::resource_ptr<VulkanDescriptorSetLayout> layout);
 
-    void initVkLayout(fvkmemory::resource_ptr<VulkanDescriptorSetLayout> layout);
-
     void clearHistory();
 
 private:
-    class DescriptorSetLayoutManager;
     class DescriptorInfinitePool;
 
     using DescriptorSetArray =
@@ -85,7 +78,6 @@ private:
 
     VkDevice mDevice;
     fvkmemory::ResourceManager* mResourceManager;
-    std::unique_ptr<DescriptorSetLayoutManager> mLayoutManager;
     std::unique_ptr<DescriptorInfinitePool> mDescriptorPool;
     std::pair<VulkanAttachment, VkDescriptorImageInfo> mInputAttachment;
     DescriptorSetArray mStashedSets = {};
@@ -99,4 +91,4 @@ private:
 
 }// namespace filament::backend
 
-#endif// TNT_FILAMENT_BACKEND_CACHING_VULKANDESCRIPTORSETMANAGER_H
+#endif// TNT_FILAMENT_BACKEND_CACHING_VULKANDESCRIPTORSETCACHE_H

filament/backend/src/vulkan/VulkanDescriptorSetLayoutCache.cpp

@@ -0,0 +1,110 @@
+/*
+ * 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 "VulkanDescriptorSetLayoutCache.h"
+
+#include "VulkanHandles.h"
+
+namespace filament::backend {
+
+namespace {
+
+using BitmaskGroup = VulkanDescriptorSetLayout::Bitmask;
+
+template<typename Bitmask>
+uint32_t appendBindings(VkDescriptorSetLayoutBinding* toBind, VkDescriptorType type,
+        Bitmask const& mask) {
+    uint32_t count = 0;
+    Bitmask alreadySeen;
+    mask.forEachSetBit([&](size_t index) {
+        VkShaderStageFlags stages = 0;
+        uint32_t binding = 0;
+        if (index < fvkutils::getFragmentStageShift<Bitmask>()) {
+            binding = (uint32_t) index;
+            stages |= VK_SHADER_STAGE_VERTEX_BIT;
+            auto fragIndex = index + fvkutils::getFragmentStageShift<Bitmask>();
+            if (mask.test(fragIndex)) {
+                stages |= VK_SHADER_STAGE_FRAGMENT_BIT;
+                alreadySeen.set(fragIndex);
+            }
+        } else if (!alreadySeen.test(index)) {
+            // We are in fragment stage bits
+            binding = (uint32_t) (index - fvkutils::getFragmentStageShift<Bitmask>());
+            stages |= VK_SHADER_STAGE_FRAGMENT_BIT;
+        }
+
+        if (stages) {
+            toBind[count++] = {
+                .binding = binding,
+                .descriptorType = type,
+                .descriptorCount = 1,
+                .stageFlags = stages,
+            };
+        }
+    });
+    return count;
+}
+
+} // anonymous namespace
+
+VulkanDescriptorSetLayoutCache::VulkanDescriptorSetLayoutCache(VkDevice device,
+        fvkmemory::ResourceManager* resourceManager)
+    : mDevice(device),
+      mResourceManager(resourceManager) {}
+
+VulkanDescriptorSetLayoutCache::~VulkanDescriptorSetLayoutCache() = default;
+
+void VulkanDescriptorSetLayoutCache::terminate() noexcept {
+    for (auto& itr: mVkLayouts) {
+        vkDestroyDescriptorSetLayout(mDevice, itr.second, VKALLOC);
+    }
+}
+
+fvkmemory::resource_ptr<VulkanDescriptorSetLayout> VulkanDescriptorSetLayoutCache::createLayout(
+        Handle<HwDescriptorSetLayout> handle, backend::DescriptorSetLayout&& info) {
+    auto layout = fvkmemory::resource_ptr<VulkanDescriptorSetLayout>::make(mResourceManager, handle,
+            info);
+    VkDescriptorSetLayout vklayout = VK_NULL_HANDLE;
+    auto const& bitmasks = layout->bitmask;
+    if (auto itr = mVkLayouts.find(bitmasks); itr != mVkLayouts.end()) {
+        vklayout = itr->second;
+    } else {
+        VkDescriptorSetLayoutBinding toBind[VulkanDescriptorSetLayout::MAX_BINDINGS];
+        uint32_t count = 0;
+        count += appendBindings(&toBind[count], VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC,
+                bitmasks.dynamicUbo);
+        count += appendBindings(&toBind[count], VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, bitmasks.ubo);
+        count += appendBindings(&toBind[count], VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
+                bitmasks.sampler);
+        count += appendBindings(&toBind[count], VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT,
+                bitmasks.inputAttachment);
+
+        assert_invariant(count != 0 && "Need at least one binding for descriptor set layout.");
+        VkDescriptorSetLayoutCreateInfo dlinfo = {
+            .sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO,
+            .pNext = nullptr,
+            .bindingCount = count,
+            .pBindings = toBind,
+        };
+
+        vkCreateDescriptorSetLayout(mDevice, &dlinfo, VKALLOC, &vklayout);
+        mVkLayouts[bitmasks] = vklayout;
+    }
+    layout->setVkLayout(vklayout);
+    return layout;
+}
+
+} // namespace filament::backend

filament/backend/src/vulkan/VulkanDescriptorSetLayoutCache.h

@@ -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_CACHING_VULKANDESCRIPTORSETLAYOUTCACHE_H
+#define TNT_FILAMENT_BACKEND_CACHING_VULKANDESCRIPTORSETLAYOUTCACHE_H
+
+#include "VulkanHandles.h"
+
+#include "vulkan/memory/ResourcePointer.h"
+
+#include <backend/DriverEnums.h>
+#include <backend/Program.h>
+#include <backend/TargetBufferInfo.h>
+
+#include <utils/bitset.h>
+
+#include <bluevk/BlueVK.h>
+#include <tsl/robin_map.h>
+
+#include <memory>
+
+namespace filament::backend {
+
+class VulkanDescriptorSetLayoutCache {
+public:
+    VulkanDescriptorSetLayoutCache(VkDevice device, fvkmemory::ResourceManager* resourceManager);
+    ~VulkanDescriptorSetLayoutCache();
+
+    void terminate() noexcept;
+
+    fvkmemory::resource_ptr<VulkanDescriptorSetLayout> createLayout(
+            Handle<HwDescriptorSetLayout> handle, backend::DescriptorSetLayout&& info);
+
+private:
+    VkDevice mDevice;
+    fvkmemory::ResourceManager* mResourceManager;
+
+    using BitmaskGroup = VulkanDescriptorSetLayout::Bitmask;
+    using BitmaskGroupHashFn = utils::hash::MurmurHashFn<BitmaskGroup>;
+    struct BitmaskGroupEqual {
+        bool operator()(BitmaskGroup const& k1, BitmaskGroup const& k2) const { return k1 == k2; }
+    };
+
+    tsl::robin_map<BitmaskGroup, VkDescriptorSetLayout, BitmaskGroupHashFn, BitmaskGroupEqual>
+            mVkLayouts;
+};
+
+} // namespace filament::backend
+
+#endif// TNT_FILAMENT_BACKEND_CACHING_VULKANDESCRIPTORSETLAYOUTCACHE_H

filament/backend/src/vulkan/VulkanDriver.cpp

@@ -17,7 +17,6 @@
 #include "VulkanDriver.h"
 
 #include "CommandStreamDispatcher.h"
-#include "DataReshaper.h"
 #include "SystraceProfile.h"
 #include "VulkanAsyncHandles.h"
 #include "VulkanBuffer.h"
@@ -35,7 +34,6 @@
 #include <backend/platforms/VulkanPlatform.h>
 
 #include <utils/CString.h>
-#include <utils/FixedCapacityVector.h>
 #include <utils/Panic.h>
 
 #ifndef NDEBUG
@@ -44,8 +42,6 @@
 
 using namespace bluevk;
 
-using utils::FixedCapacityVector;
-
 #if defined(__clang__)
 // Vulkan functions often immediately dereference pointers, so it's fine to pass in a pointer
 // to a stack-allocated variable.
@@ -219,7 +215,8 @@ VulkanDriver::VulkanDriver(VulkanPlatform* platform, VulkanContext const& contex
       mSamplerCache(mPlatform->getDevice()),
       mBlitter(mPlatform->getPhysicalDevice(), &mCommands),
       mReadPixels(mPlatform->getDevice()),
-      mDescriptorSetManager(mPlatform->getDevice(), &mResourceManager),
+      mDescriptorSetLayoutCache(mPlatform->getDevice(), &mResourceManager),
+      mDescriptorSetCache(mPlatform->getDevice(), &mResourceManager),
       mQueryManager(mPlatform->getDevice()),
       mIsSRGBSwapChainSupported(mPlatform->getCustomization().isSRGBSwapChainSupported),
       mStereoscopicType(driverConfig.stereoscopicType) {
@@ -329,7 +326,8 @@ void VulkanDriver::terminate() {
     mPipelineCache.terminate();
     mFramebufferCache.reset();
     mSamplerCache.terminate();
-    mDescriptorSetManager.terminate();
+    mDescriptorSetLayoutCache.terminate();
+    mDescriptorSetCache.terminate();
     mPipelineLayoutCache.terminate();
 
     // Before terminating ResourceManager, we must make sure all of the resource_ptrs have been unset.
@@ -365,7 +363,7 @@ void VulkanDriver::collectGarbage() {
     FVK_SYSTRACE_SCOPE();
     // Command buffers need to be submitted and completed before other resources can be gc'd.
     mCommands.gc();
-    mDescriptorSetManager.clearHistory();
+    mDescriptorSetCache.clearHistory();
     mStagePool.gc();
     mFramebufferCache.gc();
     mPipelineCache.gc();
@@ -408,7 +406,7 @@ void VulkanDriver::updateDescriptorSetBuffer(
     FVK_SYSTRACE_SCOPE();
     auto set = resource_ptr<VulkanDescriptorSet>::cast(&mResourceManager, dsh);
     auto buffer = resource_ptr<VulkanBufferObject>::cast(&mResourceManager, boh);
-    mDescriptorSetManager.updateBuffer(set, binding, buffer, offset, size);
+    mDescriptorSetCache.updateBuffer(set, binding, buffer, offset, size);
 }
 
 void VulkanDriver::updateDescriptorSetTexture(
@@ -421,7 +419,7 @@ void VulkanDriver::updateDescriptorSetTexture(
     auto texture = resource_ptr<VulkanTexture>::cast(&mResourceManager, th);
 
     VkSampler const vksampler = mSamplerCache.getSampler(params);
-    mDescriptorSetManager.updateSampler(set, binding, texture, vksampler);
+    mDescriptorSetCache.updateSampler(set, binding, texture, vksampler);
 }
 
 void VulkanDriver::flush(int) {
@@ -554,13 +552,45 @@ void VulkanDriver::createTextureViewSwizzleR(Handle<HwTexture> th, Handle<HwText
    texture.inc();
 }
 
-void VulkanDriver::createTextureExternalImage2R(Handle<HwTexture> th,
-        backend::SamplerType target,  backend::TextureFormat format,
-        uint32_t width, uint32_t height, backend::TextureUsage usage,
+void VulkanDriver::createTextureExternalImage2R(Handle<HwTexture> th, backend::SamplerType target,
+        backend::TextureFormat format, uint32_t width, uint32_t height, backend::TextureUsage usage,
         Platform::ExternalImageHandleRef externalImage) {
     FVK_SYSTRACE_SCOPE();
+    const auto& metadata = mPlatform->getExternalImageMetadata(externalImage);
+    if (metadata.isProtected) {
+        usage |= backend::TextureUsage::PROTECTED;
+    }
 
-    // FIXME: implement createTextureExternalImage2R
+    VkImageUsageFlags vkUsage = metadata.usage;
+    if (any(usage & TextureUsage::BLIT_SRC)) {
+        vkUsage |= VK_IMAGE_USAGE_TRANSFER_SRC_BIT;
+    }
+
+    if (any(usage & (TextureUsage::BLIT_DST & TextureUsage::UPLOADABLE))) {
+        vkUsage |= VK_IMAGE_USAGE_TRANSFER_DST_BIT;
+    }
+
+    assert_invariant(width == metadata.width);
+    assert_invariant(height == metadata.height);
+    assert_invariant(fvkutils::getVkFormat(format) == metadata.format);
+
+    VkMemoryPropertyFlags const requiredMemoryFlags = any(usage & TextureUsage::UPLOADABLE)
+                                                              ? VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT
+                                                              : VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT;
+    uint32_t const memoryTypeIndex =
+            mContext.selectMemoryType(metadata.memoryTypeBits, requiredMemoryFlags);
+    FILAMENT_CHECK_POSTCONDITION(memoryTypeIndex != VK_MAX_MEMORY_TYPES)
+            << "failed to find a valid memory type for external image memory.";
+
+    const auto& data =
+            mPlatform->createExternalImageData(externalImage, metadata, memoryTypeIndex, vkUsage);
+
+    auto texture = resource_ptr<VulkanTexture>::make(&mResourceManager, th, mPlatform->getDevice(),
+            mAllocator, &mResourceManager, &mCommands, data.first, data.second, metadata.format,
+            metadata.samples, metadata.width, metadata.height, metadata.layerCount, usage,
+            mStagePool);
+
+    texture.inc();
 }
 
 void VulkanDriver::createTextureExternalImageR(Handle<HwTexture> th, backend::SamplerType target,
@@ -568,22 +598,7 @@ void VulkanDriver::createTextureExternalImageR(Handle<HwTexture> th, backend::Sa
         void* externalImage) {
     FVK_SYSTRACE_SCOPE();
 
-    const auto& metadata = mPlatform->getExternalImageMetadata(externalImage);
-    if (metadata.isProtected) {
-        usage |= backend::TextureUsage::PROTECTED;
-    }
-
-    assert_invariant(width == metadata.width);
-    assert_invariant(height == metadata.height);
-    assert_invariant(fvkutils::getVkFormat(format) == metadata.format);
-
-    const auto& data = mPlatform->createExternalImage(externalImage, metadata);
-
-    auto texture = resource_ptr<VulkanTexture>::make(&mResourceManager, th, mPlatform->getDevice(),
-        mAllocator, &mResourceManager, &mCommands, data.first, data.second, metadata.format,
-        1, metadata.width, metadata.height, /*depth=*/1, usage, mStagePool);
-
-    texture.inc();
+    // not supported in this backend
 }
 
 void VulkanDriver::createTextureExternalImagePlaneR(Handle<HwTexture> th,
@@ -761,8 +776,7 @@ void VulkanDriver::createTimerQueryR(Handle<HwTimerQuery> tqh, int) {
 
 void VulkanDriver::createDescriptorSetLayoutR(Handle<HwDescriptorSetLayout> dslh,
         backend::DescriptorSetLayout&& info) {
-    auto layout = resource_ptr<VulkanDescriptorSetLayout>::make(&mResourceManager, dslh, info);
-    mDescriptorSetManager.initVkLayout(layout);
+    auto layout = mDescriptorSetLayoutCache.createLayout(dslh, std::move(info));
     layout.inc();
 }
 
@@ -771,7 +785,7 @@ void VulkanDriver::createDescriptorSetR(Handle<HwDescriptorSet> dsh,
     FVK_SYSTRACE_SCOPE();
     fvkmemory::resource_ptr<VulkanDescriptorSetLayout> layout =
             fvkmemory::resource_ptr<VulkanDescriptorSetLayout>::cast(&mResourceManager, dslh);
-    auto set = mDescriptorSetManager.createSet(dsh, layout);
+    auto set = mDescriptorSetCache.createSet(dsh, layout);
     set.inc();
 }
 
@@ -1130,6 +1144,16 @@ size_t VulkanDriver::getMaxUniformBufferSize() {
     return 32768;
 }
 
+size_t VulkanDriver::getMaxTextureSize(SamplerType) {
+    // TODO: return the actual size instead of hardcoded value
+    return 2048;
+}
+
+size_t VulkanDriver::getMaxArrayTextureLayers() {
+    // TODO: return the actual size instead of hardcoded value
+    return 256;
+}
+
 void VulkanDriver::setVertexBufferObject(Handle<HwVertexBuffer> vbh, uint32_t index,
         Handle<HwBufferObject> boh) {
     auto vb = resource_ptr<VulkanVertexBuffer>::cast(&mResourceManager, vbh);
@@ -1266,10 +1290,9 @@ void VulkanDriver::generateMipmaps(Handle<HwTexture> th) {
             mBlitter.blit(VK_FILTER_LINEAR, dst, dstOffsets, src, srcOffsets);
         }
 
-        level++;
         srcw = dstw;
         srch = dsth;
-    } while ((srcw > 1 || srch > 1) && level < t->levels);
+    } while ((srcw > 1 || srch > 1) && ++level < t->levels - 1);
 }
 
 void VulkanDriver::compilePrograms(CompilerPriorityQueue priority,
@@ -1467,7 +1490,7 @@ void VulkanDriver::nextSubpass(int) {
 
     if (mCurrentRenderPass.params.subpassMask & 0x1) {
         VulkanAttachment& subpassInput = renderTarget->getColor0();
-        mDescriptorSetManager.updateInputAttachment({}, subpassInput);
+        mDescriptorSetCache.updateInputAttachment({}, subpassInput);
     }
 }
 
@@ -1794,9 +1817,9 @@ void VulkanDriver::bindDescriptorSet(
         backend::DescriptorSetOffsetArray&& offsets) {
     if (dsh) {
         auto set = resource_ptr<VulkanDescriptorSet>::cast(&mResourceManager, dsh);
-        mDescriptorSetManager.bind(setIndex, set, std::move(offsets));
+        mDescriptorSetCache.bind(setIndex, set, std::move(offsets));
     } else {
-        mDescriptorSetManager.unbind(setIndex);
+        mDescriptorSetCache.unbind(setIndex);
     }
 }
 
@@ -1804,7 +1827,7 @@ void VulkanDriver::draw2(uint32_t indexOffset, uint32_t indexCount, uint32_t ins
     FVK_SYSTRACE_SCOPE();
     VkCommandBuffer cmdbuffer = mCurrentRenderPass.commandBuffer->buffer();
 
-    mDescriptorSetManager.commit(mCurrentRenderPass.commandBuffer,
+    mDescriptorSetCache.commit(mCurrentRenderPass.commandBuffer,
             mBoundPipeline.pipelineLayout,
             mBoundPipeline.descriptorSetMask);
 

filament/backend/src/vulkan/VulkanDriver.h

@@ -27,8 +27,9 @@
 #include "VulkanSamplerCache.h"
 #include "VulkanStagePool.h"
 #include "VulkanQueryManager.h"
-#include "vulkan/caching/VulkanDescriptorSetManager.h"
-#include "vulkan/caching/VulkanPipelineLayoutCache.h"
+#include "vulkan/VulkanDescriptorSetCache.h"
+#include "vulkan/VulkanDescriptorSetLayoutCache.h"
+#include "vulkan/VulkanPipelineLayoutCache.h"
 #include "vulkan/memory/ResourceManager.h"
 #include "vulkan/memory/ResourcePointer.h"
 #include "vulkan/utils/Definitions.h"
@@ -137,7 +138,8 @@ private:
     VulkanSamplerCache mSamplerCache;
     VulkanBlitter mBlitter;
     VulkanReadPixels mReadPixels;
-    VulkanDescriptorSetManager mDescriptorSetManager;
+    VulkanDescriptorSetLayoutCache mDescriptorSetLayoutCache;
+    VulkanDescriptorSetCache mDescriptorSetCache;
     VulkanQueryManager mQueryManager;
 
     // This is necessary for us to write to push constants after binding a pipeline.

filament/backend/src/vulkan/VulkanPipelineCache.cpp

@@ -15,15 +15,12 @@
  */
 
 #include "VulkanPipelineCache.h"
-#include "VulkanMemory.h"
-#include "caching/VulkanDescriptorSetManager.h"
 
 #include <utils/Log.h>
 #include <utils/Panic.h>
 
 #include "VulkanConstants.h"
 #include "VulkanHandles.h"
-#include "VulkanTexture.h"
 #include "vulkan/utils/Conversion.h"
 
 #if defined(__clang__)

filament/backend/src/vulkan/VulkanPipelineLayoutCache.h

@@ -17,7 +17,8 @@
 #ifndef TNT_FILAMENT_BACKEND_VULKANPIPELINELAYOUTCACHE_H
 #define TNT_FILAMENT_BACKEND_VULKANPIPELINELAYOUTCACHE_H
 
-#include <vulkan/VulkanHandles.h>
+#include "VulkanHandles.h"
+
 #include <bluevk/BlueVK.h>
 
 #include <utils/Hash.h>

filament/backend/src/vulkan/VulkanSamplerCache.cpp

@@ -23,79 +23,6 @@ using namespace bluevk;
 
 namespace filament::backend {
 
-constexpr inline VkSamplerAddressMode getWrapMode(SamplerWrapMode mode) noexcept {
-    switch (mode) {
-        case SamplerWrapMode::REPEAT:
-            return VK_SAMPLER_ADDRESS_MODE_REPEAT;
-        case SamplerWrapMode::CLAMP_TO_EDGE:
-            return VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
-        case SamplerWrapMode::MIRRORED_REPEAT:
-            return VK_SAMPLER_ADDRESS_MODE_MIRRORED_REPEAT;
-    }
-}
-
-constexpr inline VkFilter getFilter(SamplerMinFilter filter) noexcept {
-    switch (filter) {
-        case SamplerMinFilter::NEAREST:
-            return VK_FILTER_NEAREST;
-        case SamplerMinFilter::LINEAR:
-            return VK_FILTER_LINEAR;
-        case SamplerMinFilter::NEAREST_MIPMAP_NEAREST:
-            return VK_FILTER_NEAREST;
-        case SamplerMinFilter::LINEAR_MIPMAP_NEAREST:
-            return VK_FILTER_LINEAR;
-        case SamplerMinFilter::NEAREST_MIPMAP_LINEAR:
-            return VK_FILTER_NEAREST;
-        case SamplerMinFilter::LINEAR_MIPMAP_LINEAR:
-            return VK_FILTER_LINEAR;
-    }
-}
-
-constexpr inline VkFilter getFilter(SamplerMagFilter filter) noexcept {
-    switch (filter) {
-        case SamplerMagFilter::NEAREST:
-            return VK_FILTER_NEAREST;
-        case SamplerMagFilter::LINEAR:
-            return VK_FILTER_LINEAR;
-    }
-}
-
-constexpr inline VkSamplerMipmapMode getMipmapMode(SamplerMinFilter filter) noexcept {
-    switch (filter) {
-        case SamplerMinFilter::NEAREST:
-            return VK_SAMPLER_MIPMAP_MODE_NEAREST;
-        case SamplerMinFilter::LINEAR:
-            return VK_SAMPLER_MIPMAP_MODE_NEAREST;
-        case SamplerMinFilter::NEAREST_MIPMAP_NEAREST:
-            return VK_SAMPLER_MIPMAP_MODE_NEAREST;
-        case SamplerMinFilter::LINEAR_MIPMAP_NEAREST:
-            return VK_SAMPLER_MIPMAP_MODE_NEAREST;
-        case SamplerMinFilter::NEAREST_MIPMAP_LINEAR:
-            return VK_SAMPLER_MIPMAP_MODE_LINEAR;
-        case SamplerMinFilter::LINEAR_MIPMAP_LINEAR:
-            return VK_SAMPLER_MIPMAP_MODE_LINEAR;
-    }
-}
-
-constexpr inline float getMaxLod(SamplerMinFilter filter) noexcept {
-    switch (filter) {
-        case SamplerMinFilter::NEAREST:
-        case SamplerMinFilter::LINEAR:
-            // The Vulkan spec recommends a max LOD of 0.25 to "disable" mipmapping.
-            // See "Mapping of OpenGL to Vulkan filter modes" in the VK Spec.
-            return 0.25f;
-        case SamplerMinFilter::NEAREST_MIPMAP_NEAREST:
-        case SamplerMinFilter::LINEAR_MIPMAP_NEAREST:
-        case SamplerMinFilter::NEAREST_MIPMAP_LINEAR:
-        case SamplerMinFilter::LINEAR_MIPMAP_LINEAR:
-            return VK_LOD_CLAMP_NONE;
-    }
-}
-
-constexpr inline VkBool32 getCompareEnable(SamplerCompareMode mode) noexcept {
-    return mode == SamplerCompareMode::NONE ? VK_FALSE : VK_TRUE;
-}
-
 VulkanSamplerCache::VulkanSamplerCache(VkDevice device)
     : mDevice(device) {}
 
@@ -106,18 +33,18 @@ VkSampler VulkanSamplerCache::getSampler(SamplerParams params) noexcept {
     }
     VkSamplerCreateInfo samplerInfo {
         .sType = VK_STRUCTURE_TYPE_SAMPLER_CREATE_INFO,
-        .magFilter = getFilter(params.filterMag),
-        .minFilter = getFilter(params.filterMin),
-        .mipmapMode = getMipmapMode(params.filterMin),
-        .addressModeU = getWrapMode(params.wrapS),
-        .addressModeV = getWrapMode(params.wrapT),
-        .addressModeW = getWrapMode(params.wrapR),
-        .anisotropyEnable = params.anisotropyLog2 == 0 ? 0u : 1u,
+        .magFilter = fvkutils::getFilter(params.filterMag),
+        .minFilter = fvkutils::getFilter(params.filterMin),
+        .mipmapMode = fvkutils::getMipmapMode(params.filterMin),
+        .addressModeU = fvkutils::getWrapMode(params.wrapS),
+        .addressModeV = fvkutils::getWrapMode(params.wrapT),
+        .addressModeW = fvkutils::getWrapMode(params.wrapR),
+        .anisotropyEnable = params.anisotropyLog2 == 0 ? VK_FALSE : VK_TRUE,
         .maxAnisotropy = (float)(1u << params.anisotropyLog2),
-        .compareEnable = getCompareEnable(params.compareMode),
+        .compareEnable = fvkutils::getCompareEnable(params.compareMode),
         .compareOp = fvkutils::getCompareOp(params.compareFunc),
         .minLod = 0.0f,
-        .maxLod = getMaxLod(params.filterMin),
+        .maxLod = fvkutils::getMaxLod(params.filterMin),
         .borderColor = VK_BORDER_COLOR_INT_OPAQUE_BLACK,
         .unnormalizedCoordinates = VK_FALSE
     };

filament/backend/src/vulkan/VulkanTexture.cpp

@@ -55,63 +55,61 @@ VkComponentMapping composeSwizzle(VkComponentMapping const& prev, VkComponentMap
         VK_COMPONENT_SWIZZLE_A,
     };
 
-    auto const compose = [](VkComponentSwizzle out, VkComponentMapping const& prev,
-                                 uint8_t channelIndex) {
-        // We need to first change all identities to its equivalent channel.
-        if (out == VK_COMPONENT_SWIZZLE_IDENTITY) {
-            out = IDENTITY[channelIndex];
+    auto const compose = [](VkComponentMapping const& prev,
+                                 VkComponentMapping const& next) -> VkComponentMapping {
+        VkComponentSwizzle vals[4] = { next.r, next.g, next.b, next.a };
+        for (auto& out: vals) {
+            switch (out) {
+                case VK_COMPONENT_SWIZZLE_R:
+                    out = prev.r;
+                    break;
+                case VK_COMPONENT_SWIZZLE_G:
+                    out = prev.g;
+                    break;
+                case VK_COMPONENT_SWIZZLE_B:
+                    out = prev.b;
+                    break;
+                case VK_COMPONENT_SWIZZLE_A:
+                    out = prev.a;
+                    break;
+                // Do not modify the value
+                case VK_COMPONENT_SWIZZLE_IDENTITY:
+                case VK_COMPONENT_SWIZZLE_ZERO:
+                case VK_COMPONENT_SWIZZLE_ONE:
+                // Below is not exposed in Vulkan's API, but needs to be there for compilation.
+                case VK_COMPONENT_SWIZZLE_MAX_ENUM:
+                    break;
+            }
         }
-        switch (out) {
-            case VK_COMPONENT_SWIZZLE_R:
-                out = prev.r;
-                break;
-            case VK_COMPONENT_SWIZZLE_G:
-                out = prev.g;
-                break;
-            case VK_COMPONENT_SWIZZLE_B:
-                out = prev.b;
-                break;
-            case VK_COMPONENT_SWIZZLE_A:
-                out = prev.a;
-                break;
-            case VK_COMPONENT_SWIZZLE_IDENTITY:
-            case VK_COMPONENT_SWIZZLE_ZERO:
-            case VK_COMPONENT_SWIZZLE_ONE:
-                return out;
-            // Below is not exposed in Vulkan's API, but needs to be there for compilation.
-            case VK_COMPONENT_SWIZZLE_MAX_ENUM:
-                break;
-        }
-        // If the result correctly corresponds to the identity, just return identity.
-        if (IDENTITY[channelIndex] == out) {
-            return VK_COMPONENT_SWIZZLE_IDENTITY;
-        }
-        return out;
+        return { vals[0], vals[1], vals[2], vals[3] };
     };
 
-    auto const identityToChannel = [](VkComponentSwizzle val, uint8_t channelIndex) {
-        if (val != VK_COMPONENT_SWIZZLE_IDENTITY) {
-            return val;
+    auto const identityToChannel = [](VkComponentMapping const& mapping) -> VkComponentMapping {
+        VkComponentSwizzle vals[4] = { mapping.r, mapping.g, mapping.b, mapping.a };
+        for (uint8_t i = 0; i < 4; i++) {
+            if (vals[i] != VK_COMPONENT_SWIZZLE_IDENTITY) {
+                continue;
+            }
+            vals[i] = IDENTITY[i];
         }
-        return IDENTITY[channelIndex];
+        return { vals[0], vals[1], vals[2], vals[3] };
+    };
+    auto const channelToIdentity = [](VkComponentMapping const& mapping) -> VkComponentMapping {
+        VkComponentSwizzle vals[4] = { mapping.r, mapping.g, mapping.b, mapping.a };
+        for (uint8_t i = 0; i < 4; i++) {
+            if (IDENTITY[i] != vals[i]) {
+                continue;
+            }
+            vals[i] = VK_COMPONENT_SWIZZLE_IDENTITY;
+        }
+        return { vals[0], vals[1], vals[2], vals[3] };
     };
 
     // We make sure all all identities are mapped into respective channels so that actual channel
     // mapping will be passed onto the output.
-    VkComponentMapping const prevExplicit = {
-            identityToChannel(prev.r, 0),
-            identityToChannel(prev.g, 1),
-            identityToChannel(prev.b, 2),
-            identityToChannel(prev.a, 3),
-    };
-
-    // Note that the channel index corresponds to the VkComponentMapping struct layout.
-    return {
-        compose(next.r, prevExplicit, 0),
-        compose(next.g, prevExplicit, 1),
-        compose(next.b, prevExplicit, 2),
-        compose(next.a, prevExplicit, 3),
-    };
+    VkComponentMapping const prevExplicit = identityToChannel(prev);
+    VkComponentMapping const nextExplicit = identityToChannel(next);
+    return channelToIdentity(compose(prevExplicit, nextExplicit));
 }
 
 inline VulkanLayout getDefaultLayoutImpl(TextureUsage usage) {
@@ -153,7 +151,6 @@ uint8_t getLayerCountFromDepth(uint32_t const depth) {
     return getLayerCount(getSamplerTypeFromDepth(depth), depth);
 }
 
-
 } // anonymous namespace
 
 VulkanTextureState::VulkanTextureState(VkDevice device, VmaAllocator allocator,
@@ -249,12 +246,19 @@ VulkanTexture::VulkanTexture(VkDevice device, VkPhysicalDevice physicalDevice,
 
     // Determine if we can use the transient usage flag combined with lazily allocated memory.
     const bool useTransientAttachment =
-        // Lazily allocated memory is available.
-        context.isLazilyAllocatedMemorySupported() &&
-        // Usage consists of attachment flags only.
-        none(tusage & ~TextureUsage::ALL_ATTACHMENTS) &&
-        // Usage contains at least one attachment flag.
-        any(tusage & TextureUsage::ALL_ATTACHMENTS);
+            // Lazily allocated memory is available.
+            context.isLazilyAllocatedMemorySupported() &&
+            // Usage consists of attachment flags only.
+            none(tusage & ~TextureUsage::ALL_ATTACHMENTS) &&
+            // Usage contains at least one attachment flag.
+            any(tusage & TextureUsage::ALL_ATTACHMENTS) &&
+            // Depth resolve cannot use transient attachment because it uses a custom shader.
+            // TODO: see VulkanDriver::isDepthStencilResolveSupported() to know when to remove this
+            // restriction.
+            // Note that the custom shader does not resolve stencil. We do need to move to vk 1.2
+            // and above to be able to support stencil resolve (along with depth).
+            !(any(usage & TextureUsage::DEPTH_ATTACHMENT) && samples > 1);
+
     mState->mIsTransientAttachment = useTransientAttachment;
 
     const VkImageUsageFlags transientFlag =

filament/backend/src/vulkan/platform/VulkanPlatform.cpp

@@ -978,15 +978,37 @@ VkQueue VulkanPlatform::getProtectedGraphicsQueue() const noexcept {
 }
 
 VulkanPlatform::ExternalImageMetadata VulkanPlatform::getExternalImageMetadata(
-        void* externalImage) {
+        ExternalImageHandleRef externalImage) {
     return getExternalImageMetadataImpl(externalImage, mImpl->mDevice);
 }
 
-VulkanPlatform::ImageData VulkanPlatform::createExternalImage(void* externalImage,
-            const ExternalImageMetadata& metadata) {
-    return createExternalImageImpl(externalImage, mImpl->mDevice, nullptr, metadata);
+VulkanPlatform::ImageData VulkanPlatform::createExternalImageData(
+        ExternalImageHandleRef externalImage, const ExternalImageMetadata& metadata,
+        uint32_t memoryTypeIndex, VkImageUsageFlags usage) {
+    return createExternalImageDataImpl(externalImage, mImpl->mDevice, metadata, memoryTypeIndex,
+            usage);
 }
 
+VkSampler VulkanPlatform::createExternalSampler(SamplerYcbcrConversion chroma,
+        SamplerParams sampler, uint32_t internalFormat) {
+    return createExternalSamplerImpl(mImpl->mDevice, chroma, sampler, internalFormat);
+}
+
+VkImageView VulkanPlatform::createExternalImageView(SamplerYcbcrConversion chroma,
+        uint32_t internalFormat, VkImage image, VkImageSubresourceRange range,
+        VkImageViewType viewType, VkComponentMapping swizzle) {
+    return createExternalImageViewImpl(mImpl->mDevice, chroma, internalFormat, image, range,
+            viewType, swizzle);
+}
+
+ExtensionSet VulkanPlatform::getSwapchainInstanceExtensions() const {
+    return getSwapchainInstanceExtensionsImpl();
+}
+
+VulkanPlatform::SurfaceBundle VulkanPlatform::createVkSurfaceKHR(void* nativeWindow,
+        VkInstance instance, uint64_t flags) const noexcept {
+    return createVkSurfaceKHRImpl(nativeWindow, instance, flags);
+}
 #undef SWAPCHAIN_RET_FUNC
 
 }// namespace filament::backend

filament/backend/src/vulkan/platform/VulkanPlatformAndroid.cpp

@@ -13,28 +13,60 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-#include <backend/platforms/VulkanPlatform.h>
+#include <backend/platforms/VulkanPlatformAndroid.h>
+
+#include <backend/DriverEnums.h>
+#include <private/backend/BackendUtilsAndroid.h>
 
 #include "vulkan/VulkanConstants.h"
 
 #include <utils/Panic.h>
+#include "vulkan/utils/Image.h"
+#include "vulkan/utils/Conversion.h"
 
 #include <bluevk/BlueVK.h>
 
 #include <android/hardware_buffer.h>
 #include <android/native_window.h>
 
+#include <utility>
+
 using namespace bluevk;
 
 namespace filament::backend {
 
 namespace {
-void getVKFormatAndUsage(const AHardwareBuffer_Desc& desc, VkFormat& format,
-        VkImageUsageFlags& usage, bool& isProtected) {
+
+VkFormat transformVkFormat(VkFormat format, bool sRGB) {
+    if (!sRGB) {
+        return format;
+    }
+
+    switch (format) {
+        case VK_FORMAT_R8G8B8A8_UNORM:
+            format = VK_FORMAT_R8G8B8A8_SRGB;
+            break;
+        case VK_FORMAT_R8G8B8_UNORM:
+            format = VK_FORMAT_R8G8B8_SRGB;
+            break;
+        default:
+            break;
+    }
+
+    return format;
+}
+
+bool isProtectedFromUsage(uint64_t usage) {
+    return (usage & AHARDWAREBUFFER_USAGE_PROTECTED_CONTENT) ? true : false;
+}
+
+std::pair<VkFormat, VkImageUsageFlags> getVKFormatAndUsage(const AHardwareBuffer_Desc& desc,
+        bool sRGB) {
+    VkFormat format = VK_FORMAT_UNDEFINED;
+    VkImageUsageFlags usage = 0;
     // Refer to "11.2.17. External Memory Handle Types" in the spec, and
     // Tables 13/14 for how the following derivation works.
     bool isDepthFormat = false;
-    isProtected = false;
     switch (desc.format) {
         case AHARDWAREBUFFER_FORMAT_R8G8B8A8_UNORM:
             format = VK_FORMAT_R8G8B8A8_UNORM;
@@ -82,6 +114,8 @@ void getVKFormatAndUsage(const AHardwareBuffer_Desc& desc, VkFormat& format,
             format = VK_FORMAT_UNDEFINED;
     }
 
+    format = transformVkFormat(format, sRGB);
+
     // The following only concern usage flags derived from Table 14.
     usage = 0;
     if (desc.usage & AHARDWAREBUFFER_USAGE_GPU_SAMPLED_IMAGE) {
@@ -98,16 +132,14 @@ void getVKFormatAndUsage(const AHardwareBuffer_Desc& desc, VkFormat& format,
     if (desc.usage & AHARDWAREBUFFER_USAGE_GPU_DATA_BUFFER) {
         usage = VK_IMAGE_USAGE_STORAGE_BIT;
     }
-    if (desc.usage & AHARDWAREBUFFER_USAGE_PROTECTED_CONTENT) {
-        isProtected = true;
-    }
+
+    return { format, usage };
 }
 
-VulkanPlatform::ImageData allocateExternalImage(void* externalBuffer,
-        VkDevice device, const VkAllocationCallbacks* allocator,
-        VulkanPlatform::ExternalImageMetadata const& metadata) {
+VulkanPlatform::ImageData allocateExternalImage(AHardwareBuffer* buffer, VkDevice device,
+        VulkanPlatform::ExternalImageMetadata const& metadata, uint32_t memoryTypeIndex,
+        VkImageUsageFlags usage) {
     VulkanPlatform::ImageData data;
-    AHardwareBuffer* buffer = static_cast<AHardwareBuffer*>(externalBuffer);
 
     // if external format we need to specifiy it in the allocation
     const bool useExternalFormat = metadata.format == VK_FORMAT_UNDEFINED;
@@ -115,8 +147,8 @@ VulkanPlatform::ImageData allocateExternalImage(void* externalBuffer,
     const VkExternalFormatANDROID externalFormat = {
         .sType = VK_STRUCTURE_TYPE_EXTERNAL_FORMAT_ANDROID,
         .pNext = nullptr,
-        .externalFormat = metadata
-                .externalFormat,// pass down the format (external means we don't have it VK defined)
+        // pass down the format (external means we don't have it VK defined)
+        .externalFormat = metadata.externalFormat,
     };
     const VkExternalMemoryImageCreateInfo externalCreateInfo = {
         .sType = VK_STRUCTURE_TYPE_EXTERNAL_MEMORY_IMAGE_CREATE_INFO,
@@ -124,7 +156,7 @@ VulkanPlatform::ImageData allocateExternalImage(void* externalBuffer,
         .handleTypes = VK_EXTERNAL_MEMORY_HANDLE_TYPE_ANDROID_HARDWARE_BUFFER_BIT_ANDROID,
     };
 
-    VkImageCreateInfo imageInfo{.sType = VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO};
+    VkImageCreateInfo imageInfo{ .sType = VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO };
     imageInfo.pNext = &externalCreateInfo;
     imageInfo.format = metadata.format;
     imageInfo.imageType = VK_IMAGE_TYPE_2D;
@@ -135,12 +167,10 @@ VulkanPlatform::ImageData allocateExternalImage(void* externalBuffer,
     };
     imageInfo.mipLevels = 1;
     imageInfo.arrayLayers = metadata.layers;
-    imageInfo.usage = metadata.usage;
-    // In the unprotected case add R/W capabilities
-    if (metadata.isProtected == false)
-        imageInfo.usage |= VK_IMAGE_USAGE_TRANSFER_DST_BIT | VK_IMAGE_USAGE_TRANSFER_SRC_BIT;
+    imageInfo.samples = metadata.samples;
+    imageInfo.usage = usage;
 
-    VkResult result = vkCreateImage(device, &imageInfo, allocator, &data.first);
+    VkResult result = vkCreateImage(device, &imageInfo, VKALLOC, &data.first);
     FILAMENT_CHECK_POSTCONDITION(result == VK_SUCCESS)
             << "vkCreateImage failed with error=" << static_cast<int32_t>(result);
 
@@ -156,11 +186,13 @@ VulkanPlatform::ImageData allocateExternalImage(void* externalBuffer,
         .image = data.first,
         .buffer = VK_NULL_HANDLE,
     };
-    VkMemoryAllocateInfo allocInfo = {.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO,
+    VkMemoryAllocateInfo allocInfo = {
+        .sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO,
         .pNext = &memoryDedicatedAllocateInfo,
         .allocationSize = metadata.allocationSize,
-        .memoryTypeIndex = metadata.memoryTypeBits};
-    result = vkAllocateMemory(device, &allocInfo, allocator, &data.second);
+        .memoryTypeIndex = memoryTypeIndex,
+    };
+    result = vkAllocateMemory(device, &allocInfo, VKALLOC, &data.second);
     FILAMENT_CHECK_POSTCONDITION(result == VK_SUCCESS)
             << "vkAllocateMemory failed with error=" << static_cast<int32_t>(result);
 
@@ -169,23 +201,60 @@ VulkanPlatform::ImageData allocateExternalImage(void* externalBuffer,
 
 }// namespace
 
-VulkanPlatform::ExternalImageMetadata VulkanPlatform::getExternalImageMetadataImpl(void* externalImage,
-        VkDevice device) {
+VulkanPlatformAndroid::ExternalImageVulkanAndroid::~ExternalImageVulkanAndroid() = default;
+
+Platform::ExternalImageHandle VulkanPlatformAndroid::createExternalImage(
+        AHardwareBuffer const* buffer, bool sRGB) noexcept {
+    if (__builtin_available(android 26, *)) {
+        AHardwareBuffer_Desc hardwareBufferDescription = {};
+        AHardwareBuffer_describe(buffer, &hardwareBufferDescription);
+
+        auto* const p = new (std::nothrow) ExternalImageVulkanAndroid;
+        p->aHardwareBuffer = const_cast<AHardwareBuffer*>(buffer);
+        p->sRGB = sRGB;
+        p->height = hardwareBufferDescription.height;
+        p->width = hardwareBufferDescription.width;
+        TextureFormat textureFormat = mapToFilamentFormat(hardwareBufferDescription.format, sRGB);
+        p->format = textureFormat;
+        p->usage = mapToFilamentUsage(hardwareBufferDescription.usage, textureFormat);
+        return Platform::ExternalImageHandle{ p };
+    }
+
+    return Platform::ExternalImageHandle{};
+}
+
+VulkanPlatformAndroid::ExternalImageDescAndroid VulkanPlatformAndroid::getExternalImageDesc(
+        ExternalImageHandleRef externalImage) const noexcept {
+    auto const* fvkExternalImage =
+            static_cast<ExternalImageVulkanAndroid const*>(externalImage.get());
+
+    return {
+        .width = fvkExternalImage->width,
+        .height = fvkExternalImage->height,
+        .format = fvkExternalImage->format,
+        .usage = fvkExternalImage->usage,
+    };
+}
+
+VulkanPlatform::ExternalImageMetadata VulkanPlatformAndroid::getExternalImageMetadata(
+        ExternalImageHandleRef externalImage) {
+    auto const* fvkExternalImage =
+            static_cast<ExternalImageVulkanAndroid const*>(externalImage.get());
+
     ExternalImageMetadata metadata;
-    AHardwareBuffer* buffer = static_cast<AHardwareBuffer*>(externalImage);
+    AHardwareBuffer* buffer = fvkExternalImage->aHardwareBuffer;
     if (__builtin_available(android 26, *)) {
         AHardwareBuffer_Desc bufferDesc;
         AHardwareBuffer_describe(buffer, &bufferDesc);
         metadata.width = bufferDesc.width;
         metadata.height = bufferDesc.height;
         metadata.layers = bufferDesc.layers;
+        metadata.isProtected = isProtectedFromUsage(bufferDesc.usage);
+        std::tie(metadata.format, metadata.usage) =
+                getVKFormatAndUsage(bufferDesc, fvkExternalImage->sRGB);
+    }
 
-        getVKFormatAndUsage(bufferDesc, metadata.format, metadata.usage, metadata.isProtected);
-    }
-    // In the unprotected case add R/W capabilities
-    if (metadata.isProtected == false) {
-        metadata.usage |= VK_IMAGE_USAGE_TRANSFER_DST_BIT | VK_IMAGE_USAGE_TRANSFER_SRC_BIT;
-    }
+    metadata.samples = VK_SAMPLE_COUNT_1_BIT;
 
     VkAndroidHardwareBufferFormatPropertiesANDROID formatInfo = {
         .sType = VK_STRUCTURE_TYPE_ANDROID_HARDWARE_BUFFER_FORMAT_PROPERTIES_ANDROID,
@@ -195,36 +264,155 @@ VulkanPlatform::ExternalImageMetadata VulkanPlatform::getExternalImageMetadataIm
         .sType = VK_STRUCTURE_TYPE_ANDROID_HARDWARE_BUFFER_PROPERTIES_ANDROID,
         .pNext = &formatInfo,
     };
-    VkResult result = vkGetAndroidHardwareBufferPropertiesANDROID(device, buffer, &properties);
+    VkResult result = vkGetAndroidHardwareBufferPropertiesANDROID(getDevice(), buffer, &properties);
     FILAMENT_CHECK_POSTCONDITION(result == VK_SUCCESS)
             << "vkGetAndroidHardwareBufferProperties failed with error="
             << static_cast<int32_t>(result);
-    FILAMENT_CHECK_POSTCONDITION(metadata.format == formatInfo.format)
-            << "mismatched image format for external image (AHB)";
+
+    VkFormat bufferPropertiesFormat = transformVkFormat(formatInfo.format, fvkExternalImage->sRGB);
+    FILAMENT_CHECK_POSTCONDITION(metadata.format == bufferPropertiesFormat)
+            << "mismatched image format( " << metadata.format << ") and queried format("
+            << bufferPropertiesFormat << ") for external image (AHB)";
     metadata.externalFormat = formatInfo.externalFormat;
     metadata.allocationSize = properties.allocationSize;
     metadata.memoryTypeBits = properties.memoryTypeBits;
     return metadata;
 }
 
-VulkanPlatform::ImageData VulkanPlatform::createExternalImageImpl(void* externalImage,
-        VkDevice device, const VkAllocationCallbacks* allocator,
-        const ExternalImageMetadata& metadata) {
-    ImageData data = allocateExternalImage(externalImage, device, allocator, metadata);
-    VkResult result = vkBindImageMemory(device, data.first, data.second, 0);
+VulkanPlatformAndroid::ImageData VulkanPlatformAndroid::createExternalImageData(
+        ExternalImageHandleRef externalImage, const ExternalImageMetadata& metadata,
+        uint32_t memoryTypeIndex, VkImageUsageFlags usage) {
+    auto const* fvkExternalImage =
+            static_cast<ExternalImageVulkanAndroid const*>(externalImage.get());
+    ImageData data = allocateExternalImage(fvkExternalImage->aHardwareBuffer, getDevice(), metadata,
+            memoryTypeIndex, usage);
+    VkResult result = vkBindImageMemory(getDevice(), data.first, data.second, 0);
     FILAMENT_CHECK_POSTCONDITION(result == VK_SUCCESS)
-            << "vkBindImageMemory error=" << static_cast<int32_t>(result);
+        << "vkBindImageMemory error=" << static_cast<int32_t>(result);
     return data;
 }
 
-VulkanPlatform::ExtensionSet VulkanPlatform::getSwapchainInstanceExtensions() {
+VkImageView VulkanPlatform::createExternalImageViewImpl(VkDevice device, SamplerYcbcrConversion chroma,
+            uint32_t internalFormat, VkImage image, VkImageSubresourceRange range,
+            VkImageViewType viewType, VkComponentMapping swizzle){
+        VkExternalFormatANDROID externalFormat = {
+        .sType = VK_STRUCTURE_TYPE_EXTERNAL_FORMAT_ANDROID,
+        .pNext = nullptr,
+        .externalFormat = internalFormat,
+    };
+
+    TextureSwizzle const swizzleArray[] = {chroma.r, chroma.g, chroma.b, chroma.a};
+    VkSamplerYcbcrConversionCreateInfo conversionInfo = {
+        .sType = VK_STRUCTURE_TYPE_SAMPLER_YCBCR_CONVERSION_CREATE_INFO,
+        .pNext = &externalFormat,
+        .format = VK_FORMAT_UNDEFINED,
+        .ycbcrModel = fvkutils::getYcbcrModelConversion(chroma.ycbcrModel),
+        .ycbcrRange = fvkutils::getYcbcrRange(chroma.ycbcrRange),
+        .components = fvkutils::getSwizzleMap(swizzleArray),
+        .xChromaOffset = fvkutils::getChromaLocation(chroma.xChromaOffset),
+        .yChromaOffset = fvkutils::getChromaLocation(chroma.yChromaOffset),
+        .chromaFilter = fvkutils::getFilter(chroma.chromaFilter),
+    };
+    VkSamplerYcbcrConversion conversion = VK_NULL_HANDLE;
+    VkResult result = vkCreateSamplerYcbcrConversion(device, &conversionInfo,
+                                                     nullptr, &conversion);
+    FILAMENT_CHECK_POSTCONDITION(result == VK_SUCCESS)
+        << "Unable to create Ycbcr Conversion."
+        << " error=" << static_cast<int32_t>(result);
+
+    VkSamplerYcbcrConversionInfo samplerYcbcrConversionInfo = {
+        .sType = VK_STRUCTURE_TYPE_SAMPLER_YCBCR_CONVERSION_INFO,
+        .pNext = nullptr,
+        .conversion = conversion,
+    };
+
+    VkImageViewCreateInfo viewInfo = {
+        .sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO,
+        .pNext = &samplerYcbcrConversionInfo,
+        .flags = 0,
+        .image = image,
+        .viewType = viewType,
+        .format = VK_FORMAT_UNDEFINED,
+        .components = swizzle,
+        .subresourceRange = range,
+    };
+    VkImageView imageView;
+    result = vkCreateImageView(device, &viewInfo, VKALLOC, &imageView);
+    FILAMENT_CHECK_POSTCONDITION(result == VK_SUCCESS)
+        << "Unable to create VkImageView."
+        << " error=" << static_cast<int32_t>(result);
+
+    return imageView;
+}
+
+VkSampler VulkanPlatform::createExternalSamplerImpl(
+        VkDevice device, SamplerYcbcrConversion chroma, SamplerParams params,
+        uint32_t internalFormat) {
+    VkExternalFormatANDROID externalFormat = {
+        .sType = VK_STRUCTURE_TYPE_EXTERNAL_FORMAT_ANDROID,
+        .pNext = nullptr,
+        .externalFormat = internalFormat,
+    };
+
+    TextureSwizzle const swizzleArray[] = {chroma.r, chroma.g, chroma.b, chroma.a};
+    VkSamplerYcbcrConversionCreateInfo conversionInfo = {
+        .sType = VK_STRUCTURE_TYPE_SAMPLER_YCBCR_CONVERSION_CREATE_INFO,
+        .pNext = &externalFormat,
+        .format = VK_FORMAT_UNDEFINED,
+        .ycbcrModel = fvkutils::getYcbcrModelConversion(chroma.ycbcrModel),
+        .ycbcrRange = fvkutils::getYcbcrRange(chroma.ycbcrRange),
+        .components = fvkutils::getSwizzleMap(swizzleArray),
+        .xChromaOffset = fvkutils::getChromaLocation(chroma.xChromaOffset),
+        .yChromaOffset = fvkutils::getChromaLocation(chroma.yChromaOffset),
+        .chromaFilter = fvkutils::getFilter(chroma.chromaFilter),
+    };
+    VkSamplerYcbcrConversion conversion = VK_NULL_HANDLE;
+    VkResult result = vkCreateSamplerYcbcrConversion(device, &conversionInfo,
+                                                     nullptr, &conversion);
+    FILAMENT_CHECK_POSTCONDITION(result == VK_SUCCESS)
+        << "Unable to create Ycbcr Conversion."
+        << " error=" << static_cast<int32_t>(result);
+
+    VkSamplerYcbcrConversionInfo samplerYcbcrConversionInfo = {
+        .sType = VK_STRUCTURE_TYPE_SAMPLER_YCBCR_CONVERSION_INFO,
+        .pNext = nullptr,
+        .conversion = conversion,
+    };
+
+    VkSamplerCreateInfo samplerInfo = {
+        .sType = VK_STRUCTURE_TYPE_SAMPLER_CREATE_INFO,
+        .pNext = &samplerYcbcrConversionInfo,
+        .magFilter = fvkutils::getFilter(params.filterMag),
+        .minFilter = fvkutils::getFilter(params.filterMin),
+        .mipmapMode = fvkutils::getMipmapMode(params.filterMin),
+        .addressModeU = fvkutils::getWrapMode(params.wrapS),
+        .addressModeV = fvkutils::getWrapMode(params.wrapT),
+        .addressModeW = fvkutils::getWrapMode(params.wrapR),
+        .anisotropyEnable = params.anisotropyLog2 == 0 ? VK_FALSE : VK_TRUE,
+        .maxAnisotropy = (float)(1u << params.anisotropyLog2),
+        .compareEnable = fvkutils::getCompareEnable(params.compareMode),
+        .compareOp = fvkutils::getCompareOp(params.compareFunc),
+        .minLod = 0.0f,
+        .maxLod = fvkutils::getMaxLod(params.filterMin),
+        .borderColor = VK_BORDER_COLOR_INT_OPAQUE_BLACK,
+        .unnormalizedCoordinates = VK_FALSE,
+    };
+    VkSampler sampler;
+    result = vkCreateSampler(device, &samplerInfo, VKALLOC, &sampler);
+    FILAMENT_CHECK_POSTCONDITION(result == VK_SUCCESS)
+        << "Unable to create sampler."
+        << " error=" << static_cast<int32_t>(result);
+    return sampler;
+}
+
+VulkanPlatform::ExtensionSet VulkanPlatformAndroid::getSwapchainInstanceExtensions() const {
     return {
         VK_KHR_ANDROID_SURFACE_EXTENSION_NAME,
     };
 }
 
-VulkanPlatform::SurfaceBundle VulkanPlatform::createVkSurfaceKHR(void* nativeWindow,
-    VkInstance instance, uint64_t flags) noexcept {
+VulkanPlatform::SurfaceBundle VulkanPlatformAndroid::createVkSurfaceKHR(void* nativeWindow,
+        VkInstance instance, uint64_t flags) const noexcept {
     VkSurfaceKHR surface;
     VkExtent2D extent;
 
@@ -236,6 +424,26 @@ VulkanPlatform::SurfaceBundle VulkanPlatform::createVkSurfaceKHR(void* nativeWin
             vkCreateAndroidSurfaceKHR(instance, &createInfo, VKALLOC, (VkSurfaceKHR*) &surface);
     FILAMENT_CHECK_POSTCONDITION(result == VK_SUCCESS)
             << "vkCreateAndroidSurfaceKHR with error=" << static_cast<int32_t>(result);
-    return {surface, extent};
+    return { surface, extent };
 }
+
+// Deprecated platform dependent helper methods
+VulkanPlatform::ExtensionSet VulkanPlatform::getSwapchainInstanceExtensionsImpl() { return {}; }
+
+VulkanPlatform::ExternalImageMetadata VulkanPlatform::getExternalImageMetadataImpl(
+        ExternalImageHandleRef externalImage, VkDevice device) {
+    return ExternalImageMetadata{};
 }
+
+VulkanPlatform::ImageData VulkanPlatform::createExternalImageDataImpl(
+        ExternalImageHandleRef externalImage, VkDevice device,
+        const ExternalImageMetadata& metadata, uint32_t memoryTypeIndex, VkImageUsageFlags usage) {
+    return ImageData{};
+}
+
+VulkanPlatform::SurfaceBundle VulkanPlatform::createVkSurfaceKHRImpl(void* nativeWindow,
+        VkInstance instance, uint64_t flags) noexcept {
+    return SurfaceBundle{};
+}
+
+}// namespace filament::backend

filament/backend/src/vulkan/platform/VulkanPlatformApple.mm

@@ -52,7 +52,7 @@ using namespace bluevk;
 
 namespace filament::backend {
 
-VulkanPlatform::ExtensionSet VulkanPlatform::getSwapchainInstanceExtensions() {
+VulkanPlatform::ExtensionSet VulkanPlatform::getSwapchainInstanceExtensionsImpl() {
     ExtensionSet const ret = {
     #if defined(__APPLE__)
         VK_MVK_MACOS_SURFACE_EXTENSION_NAME,  // TODO: replace with VK_EXT_metal_surface
@@ -64,17 +64,30 @@ VulkanPlatform::ExtensionSet VulkanPlatform::getSwapchainInstanceExtensions() {
 }
 
 VulkanPlatform::ExternalImageMetadata VulkanPlatform::getExternalImageMetadataImpl(
-        void* externalImage, VkDevice device) {
+        ExternalImageHandleRef externalImage, VkDevice device) {
     return {};
 }
 
-VulkanPlatform::ImageData VulkanPlatform::createExternalImageImpl(void* externalImage,
-        VkDevice device, const VkAllocationCallbacks* allocator,
-        const ExternalImageMetadata& metadata) {
+VulkanPlatform::ImageData VulkanPlatform::createExternalImageDataImpl(
+        ExternalImageHandleRef externalImage, VkDevice device,
+        const ExternalImageMetadata& metadata, uint32_t memoryTypeIndex, VkImageUsageFlags usage) {
     return {};
 }
 
-VulkanPlatform::SurfaceBundle VulkanPlatform::createVkSurfaceKHR(void* nativeWindow,
+VkSampler VulkanPlatform::createExternalSamplerImpl(VkDevice device,
+    SamplerYcbcrConversion chroma,
+    SamplerParams sampler,
+    uint32_t internalFormat) {
+    return VK_NULL_HANDLE;
+}
+
+VkImageView VulkanPlatform::createExternalImageViewImpl(VkDevice device,
+        SamplerYcbcrConversion chroma, uint32_t internalFormat, VkImage image,
+        VkImageSubresourceRange range, VkImageViewType viewType, VkComponentMapping swizzle) {
+    return VK_NULL_HANDLE;
+}
+
+VulkanPlatform::SurfaceBundle VulkanPlatform::createVkSurfaceKHRImpl(void* nativeWindow,
         VkInstance instance, uint64_t flags) noexcept {
     VkSurfaceKHR surface;
     #if defined(__APPLE__)

filament/backend/src/vulkan/platform/VulkanPlatformLinuxWindows.cpp

@@ -85,17 +85,30 @@ using namespace bluevk;
 namespace filament::backend {
 
 VulkanPlatform::ExternalImageMetadata VulkanPlatform::getExternalImageMetadataImpl(
-        void* externalImage, VkDevice device) {
+        ExternalImageHandleRef externalImage, VkDevice device) {
     return {};
 }
 
-VulkanPlatform::ImageData VulkanPlatform::createExternalImageImpl(void* externalImage,
-        VkDevice device, const VkAllocationCallbacks* allocator,
-        const ExternalImageMetadata& metadata) {
+VulkanPlatform::ImageData VulkanPlatform::createExternalImageDataImpl(
+        ExternalImageHandleRef externalImage, VkDevice device,
+        const ExternalImageMetadata& metadata, uint32_t memoryTypeIndex, VkImageUsageFlags usage) {
     return {};
 }
 
-VulkanPlatform::ExtensionSet VulkanPlatform::getSwapchainInstanceExtensions() {
+VkSampler VulkanPlatform::createExternalSamplerImpl(VkDevice device,
+    SamplerYcbcrConversion chroma,
+    SamplerParams sampler,
+    uint32_t internalFormat) {
+    return VK_NULL_HANDLE;
+}
+
+VkImageView VulkanPlatform::createExternalImageViewImpl(VkDevice device,
+        SamplerYcbcrConversion chroma, uint32_t internalFormat, VkImage image,
+        VkImageSubresourceRange range, VkImageViewType viewType, VkComponentMapping swizzle) {
+    return VK_NULL_HANDLE;
+}
+
+VulkanPlatform::ExtensionSet VulkanPlatform::getSwapchainInstanceExtensionsImpl() {
     VulkanPlatform::ExtensionSet const ret = {
 #if defined(__linux__) && defined(FILAMENT_SUPPORTS_WAYLAND)
         VK_KHR_WAYLAND_SURFACE_EXTENSION_NAME,
@@ -113,7 +126,7 @@ VulkanPlatform::ExtensionSet VulkanPlatform::getSwapchainInstanceExtensions() {
     return ret;
 }
 
-VulkanPlatform::SurfaceBundle VulkanPlatform::createVkSurfaceKHR(void* nativeWindow,
+VulkanPlatform::SurfaceBundle VulkanPlatform::createVkSurfaceKHRImpl(void* nativeWindow,
         VkInstance instance, uint64_t flags) noexcept {
     VkSurfaceKHR surface;
 

filament/backend/src/vulkan/utils/Conversion.cpp

@@ -588,6 +588,79 @@ VkComponentMapping getSwizzleMap(TextureSwizzle const swizzle[4]) {
     return map;
 }
 
+VkFilter getFilter(SamplerMinFilter filter) {
+    switch (filter) {
+    case SamplerMinFilter::NEAREST:
+        return VK_FILTER_NEAREST;
+    case SamplerMinFilter::LINEAR:
+        return VK_FILTER_LINEAR;
+    case SamplerMinFilter::NEAREST_MIPMAP_NEAREST:
+        return VK_FILTER_NEAREST;
+    case SamplerMinFilter::LINEAR_MIPMAP_NEAREST:
+        return VK_FILTER_LINEAR;
+    case SamplerMinFilter::NEAREST_MIPMAP_LINEAR:
+        return VK_FILTER_NEAREST;
+    case SamplerMinFilter::LINEAR_MIPMAP_LINEAR:
+        return VK_FILTER_LINEAR;
+    }
+}
+
+VkFilter getFilter(SamplerMagFilter filter) {
+    switch (filter) {
+    case SamplerMagFilter::NEAREST:
+        return VK_FILTER_NEAREST;
+    case SamplerMagFilter::LINEAR:
+        return VK_FILTER_LINEAR;
+    }
+}
+
+VkSamplerMipmapMode getMipmapMode(SamplerMinFilter filter) {
+    switch (filter) {
+    case SamplerMinFilter::NEAREST:
+        return VK_SAMPLER_MIPMAP_MODE_NEAREST;
+    case SamplerMinFilter::LINEAR:
+        return VK_SAMPLER_MIPMAP_MODE_NEAREST;
+    case SamplerMinFilter::NEAREST_MIPMAP_NEAREST:
+        return VK_SAMPLER_MIPMAP_MODE_NEAREST;
+    case SamplerMinFilter::LINEAR_MIPMAP_NEAREST:
+        return VK_SAMPLER_MIPMAP_MODE_NEAREST;
+    case SamplerMinFilter::NEAREST_MIPMAP_LINEAR:
+        return VK_SAMPLER_MIPMAP_MODE_LINEAR;
+    case SamplerMinFilter::LINEAR_MIPMAP_LINEAR:
+        return VK_SAMPLER_MIPMAP_MODE_LINEAR;
+    }
+}
+
+VkSamplerAddressMode getWrapMode(SamplerWrapMode mode) {
+    switch (mode) {
+    case SamplerWrapMode::REPEAT:
+        return VK_SAMPLER_ADDRESS_MODE_REPEAT;
+    case SamplerWrapMode::CLAMP_TO_EDGE:
+        return VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
+    case SamplerWrapMode::MIRRORED_REPEAT:
+        return VK_SAMPLER_ADDRESS_MODE_MIRRORED_REPEAT;
+    }
+}
+
+VkBool32 getCompareEnable(SamplerCompareMode mode) {
+    return mode == SamplerCompareMode::NONE ? VK_FALSE : VK_TRUE;
+}
+
+float getMaxLod(SamplerMinFilter filter) {
+    switch (filter) {
+    case SamplerMinFilter::NEAREST:
+    case SamplerMinFilter::LINEAR:
+        // The Vulkan spec recommends a max LOD of 0.25 to "disable" mipmapping.
+        // See "Mapping of OpenGL to Vulkan filter modes" in the VK Spec.
+        return 0.25f;
+    case SamplerMinFilter::NEAREST_MIPMAP_NEAREST:
+    case SamplerMinFilter::LINEAR_MIPMAP_NEAREST:
+    case SamplerMinFilter::NEAREST_MIPMAP_LINEAR:
+    case SamplerMinFilter::LINEAR_MIPMAP_LINEAR:
+        return VK_LOD_CLAMP_NONE;
+    }
+}
+
 VkShaderStageFlags getShaderStageFlags(ShaderStageFlags stageFlags) {
     VkShaderStageFlags flags = 0x0;
     if (any(stageFlags & ShaderStageFlags::VERTEX))     flags |= VK_SHADER_STAGE_VERTEX_BIT;

filament/backend/src/vulkan/utils/Conversion.h

@@ -56,6 +56,19 @@ uint32_t getComponentCount(VkFormat format);
 VkComponentMapping getSwizzleMap(TextureSwizzle const swizzle[4]);
 VkShaderStageFlags getShaderStageFlags(ShaderStageFlags stageFlags);
 
+// Needed by the Platform for external sampler creation
+VkFilter getFilter(SamplerMinFilter filter);
+VkFilter getFilter(SamplerMagFilter filter);
+VkSamplerMipmapMode getMipmapMode(SamplerMinFilter filter);
+VkSamplerAddressMode getWrapMode(SamplerWrapMode mode);
+VkBool32 getCompareEnable(SamplerCompareMode mode);
+float getMaxLod(SamplerMinFilter filter);
+
+// Ycbcr related functions
+VkSamplerYcbcrModelConversion getYcbcrModelConversion(SamplerYcbcrModelConversion model);
+VkSamplerYcbcrRange getYcbcrRange(SamplerYcbcrRange range);
+VkChromaLocation getChromaLocation(ChromaLocation loc);
+
 inline VkImageViewType getViewType(SamplerType target) {
     switch (target) {
         case SamplerType::SAMPLER_CUBEMAP:

filament/backend/src/vulkan/utils/Image.cpp

@@ -193,6 +193,49 @@ uint8_t reduceSampleCount(uint8_t sampleCount, VkSampleCountFlags mask) {
     return mostSignificantBit((sampleCount - 1) & mask);
 }
 
+VkSamplerYcbcrModelConversion getYcbcrModelConversion(
+    SamplerYcbcrModelConversion model) {
+    switch (model) {
+    case SamplerYcbcrModelConversion::RGB_IDENTITY:
+        return VK_SAMPLER_YCBCR_MODEL_CONVERSION_RGB_IDENTITY;
+    case SamplerYcbcrModelConversion::YCBCR_IDENTITY:
+        return VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_IDENTITY;
+    case SamplerYcbcrModelConversion::YCBCR_709:
+        return VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_709;
+    case SamplerYcbcrModelConversion::YCBCR_601:
+        return VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_601;
+    case SamplerYcbcrModelConversion::YCBCR_2020:
+        return VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_2020;
+    default:
+        assert_invariant(false &&
+            "Unknown data type, conversion is not supported.");
+    }
+}
+
+VkSamplerYcbcrRange getYcbcrRange(SamplerYcbcrRange range) {
+    switch (range) {
+    case SamplerYcbcrRange::ITU_FULL:
+        return VK_SAMPLER_YCBCR_RANGE_ITU_FULL;
+    case SamplerYcbcrRange::ITU_NARROW:
+        return VK_SAMPLER_YCBCR_RANGE_ITU_NARROW;
+    default:
+        assert_invariant(false &&
+            "Unknown data type, conversion is not supported.");
+    }
+}
+
+VkChromaLocation getChromaLocation(ChromaLocation loc) {
+    switch (loc) {
+    case ChromaLocation::COSITED_EVEN:
+        return VK_CHROMA_LOCATION_COSITED_EVEN;
+    case ChromaLocation::MIDPOINT:
+        return VK_CHROMA_LOCATION_MIDPOINT;
+    default:
+        assert_invariant(false &&
+            "Unknown data type, conversion is not supported.");
+    }
+}
+
 } // namespace filament::backend::fvkutils
 
 bool operator<(const VkImageSubresourceRange& a, const VkImageSubresourceRange& b) {

filament/backend/src/webgpu/WebGPUConstants.h

@@ -0,0 +1,66 @@
+/*
+ * 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_WEBGPUCONSTANTS_H
+#define TNT_FILAMENT_BACKEND_WEBGPUCONSTANTS_H
+
+#include <utils/Log.h>
+
+#include <cstdint>
+
+// FWGPU is short for Filament WebGPU
+
+// turn on runtime validation, namely for debugging, that would normally not run (for release)
+#define FWGPU_DEBUG_VALIDATION     0x00000001
+// print/log system component details to the console, e.g. about the
+// instance, surface, adapter, device, etc.
+#define FWGPU_PRINT_SYSTEM         0x00000002
+
+// Set this to enable logging "only" to one output stream. This is useful in the case where we want
+// to debug with print statements and want ordered logging (e.g slog.i and slog.e will not appear in
+// order of calls).
+#define FWGPU_DEBUG_FORCE_LOG_TO_I 0x00000004
+
+// Useful default combinations
+#define FWGPU_DEBUG_EVERYTHING     0xFFFFFFFF
+
+#if defined(FILAMENT_BACKEND_DEBUG_FLAG)
+    #define FWGPU_DEBUG_FORWARDED_FLAG (FILAMENT_BACKEND_DEBUG_FLAG & FWGPU_DEBUG_EVERYTHING)
+#else
+    #define FWGPU_DEBUG_FORWARDED_FLAG 0
+#endif
+
+#ifndef NDEBUG
+    #define FWGPU_DEBUG_FLAGS FWGPU_DEBUG_FORWARDED_FLAG
+#else
+    #define FWGPU_DEBUG_FLAGS 0
+#endif
+
+#define FWGPU_ENABLED(flags) (((FWGPU_DEBUG_FLAGS) & (flags)) == (flags))
+
+#if FWGPU_ENABLED(FWGPU_DEBUG_FORCE_LOG_TO_I)
+    #define FWGPU_LOGI (utils::slog.i)
+    #define FWGPU_LOGD FWGPU_LOGI
+    #define FWGPU_LOGE FWGPU_LOGI
+    #define FWGPU_LOGW FWGPU_LOGI
+#else
+    #define FWGPU_LOGE (utils::slog.e)
+    #define FWGPU_LOGW (utils::slog.w)
+    #define FWGPU_LOGD (utils::slog.d)
+    #define FWGPU_LOGI (utils::slog.i)
+#endif
+
+#endif// TNT_FILAMENT_BACKEND_WEBGPUCONSTANTS_H