Add OpenGL with Metal sample project

ios/samples/opengl-with-metal/.clang-format

@@ -0,0 +1,205 @@
+---
+Language:        ObjC
+# BasedOnStyle:  Google
+AccessModifierOffset: -1
+AlignAfterOpenBracket: DontAlign
+AlignConsecutiveMacros: None
+AlignConsecutiveAssignments: None
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+AlignConsecutiveDeclarations: None
+AlignEscapedNewlines: Left
+AlignOperands:   DontAlign
+AlignTrailingComments: true
+AllowAllArgumentsOnNextLine: true
+AllowAllConstructorInitializersOnNextLine: true
+AllowAllParametersOfDeclarationOnNextLine: true
+AllowShortEnumsOnASingleLine: true
+AllowShortBlocksOnASingleLine: Never
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: All
+AllowShortLambdasOnASingleLine: All
+AllowShortIfStatementsOnASingleLine: WithoutElse
+AllowShortLoopsOnASingleLine: true
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: true
+AlwaysBreakTemplateDeclarations: Yes
+AttributeMacros:
+  - __capability
+BinPackArguments: true
+BinPackParameters: true
+BraceWrapping:
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+  AfterControlStatement: Never
+  AfterEnum:       false
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+  SplitEmptyNamespace: true
+BreakBeforeBinaryOperators: None
+BreakBeforeConceptDeclarations: true
+BreakBeforeBraces: Attach
+BreakBeforeInheritanceComma: false
+BreakInheritanceList: BeforeColon
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializersBeforeComma: false
+BreakConstructorInitializers: BeforeColon
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+BreakStringLiterals: true
+ColumnLimit:     100
+CommentPragmas:  '^ IWYU pragma:'
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+ConstructorInitializerAllOnOneLineOrOnePerLine: true
+ConstructorInitializerIndentWidth: 4
+ContinuationIndentWidth: 8
+Cpp11BracedListStyle: true
+DeriveLineEnding: true
+DerivePointerAlignment: true
+DisableFormat:   false
+EmptyLineBeforeAccessModifier: LogicalBlock
+ExperimentalAutoDetectBinPacking: false
+FixNamespaceComments: true
+ForEachMacros:
+  - foreach
+  - Q_FOREACH
+  - BOOST_FOREACH
+StatementAttributeLikeMacros:
+  - Q_EMIT
+IncludeBlocks:   Preserve
+IncludeCategories:
+  - Regex:           '^<ext/.*\.h>'
+    Priority:        2
+    SortPriority:    0
+    CaseSensitive:   false
+  - Regex:           '^<.*\.h>'
+    Priority:        1
+    SortPriority:    0
+    CaseSensitive:   false
+  - Regex:           '^<.*'
+    Priority:        2
+    SortPriority:    0
+    CaseSensitive:   false
+  - Regex:           '.*'
+    Priority:        3
+    SortPriority:    0
+    CaseSensitive:   false
+IncludeIsMainRegex: '([-_](test|unittest))?$'
+IncludeIsMainSourceRegex: ''
+IndentAccessModifiers: false
+IndentCaseLabels: true
+IndentCaseBlocks: false
+IndentGotoLabels: true
+IndentPPDirectives: None
+IndentExternBlock: AfterExternBlock
+IndentRequires:  false
+IndentWidth:     4
+IndentWrappedFunctionNames: false
+InsertTrailingCommas: None
+JavaScriptQuotes: Leave
+JavaScriptWrapImports: true
+KeepEmptyLinesAtTheStartOfBlocks: false
+MacroBlockBegin: ''
+MacroBlockEnd:   ''
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: None
+ObjCBinPackProtocolList: Never
+ObjCBlockIndentWidth: 4
+ObjCBreakBeforeNestedBlockParam: true
+ObjCSpaceAfterProperty: false
+ObjCSpaceBeforeProtocolList: true
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+PenaltyBreakTemplateDeclaration: 10
+PenaltyExcessCharacter: 1000000
+PenaltyReturnTypeOnItsOwnLine: 200
+PenaltyIndentedWhitespace: 0
+PointerAlignment: Left
+RawStringFormats:
+  - Language:        Cpp
+    Delimiters:
+      - cc
+      - CC
+      - cpp
+      - Cpp
+      - CPP
+      - 'c++'
+      - 'C++'
+    CanonicalDelimiter: ''
+    BasedOnStyle:    google
+  - Language:        TextProto
+    Delimiters:
+      - pb
+      - PB
+      - proto
+      - PROTO
+    EnclosingFunctions:
+      - EqualsProto
+      - EquivToProto
+      - PARSE_PARTIAL_TEXT_PROTO
+      - PARSE_TEST_PROTO
+      - PARSE_TEXT_PROTO
+      - ParseTextOrDie
+      - ParseTextProtoOrDie
+      - ParseTestProto
+      - ParsePartialTestProto
+    CanonicalDelimiter: pb
+    BasedOnStyle:    google
+ReflowComments:  true
+ShortNamespaceLines: 1
+SortIncludes:    CaseSensitive
+SortJavaStaticImport: Before
+SortUsingDeclarations: true
+SpaceAfterCStyleCast: false
+SpaceAfterLogicalNot: false
+SpaceAfterTemplateKeyword: true
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeCaseColon: false
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+SpaceBeforeParens: ControlStatements
+SpaceAroundPointerQualifiers: Default
+SpaceBeforeRangeBasedForLoopColon: true
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+SpacesBeforeTrailingComments: 2
+SpacesInAngles:  false
+SpacesInConditionalStatement: false
+SpacesInContainerLiterals: true
+SpacesInCStyleCastParentheses: false
+SpacesInLineCommentPrefix:
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+  Maximum:         -1
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+SpacesInSquareBrackets: false
+SpaceBeforeSquareBrackets: false
+BitFieldColonSpacing: Both
+Standard:        Auto
+StatementMacros:
+  - Q_UNUSED
+  - QT_REQUIRE_VERSION
+TabWidth:        8
+UseCRLF:         false
+UseTab:          Never
+WhitespaceSensitiveMacros:
+  - STRINGIZE
+  - PP_STRINGIZE
+  - BOOST_PP_STRINGIZE
+  - NS_SWIFT_NAME
+  - CF_SWIFT_NAME
+...
+

ios/samples/opengl-with-metal/.gitignore

@@ -0,0 +1,4 @@
+## User settings
+xcuserdata/
+/generated/
+

ios/samples/opengl-with-metal/Materials/SampleExternalTexture.mat

@@ -0,0 +1,21 @@
+material {
+    name : SampleExternalTexture,
+    requires : [
+        color
+    ],
+    parameters : [
+        {
+            type : samplerExternal,
+            name : texture
+        }
+    ],
+    shadingModel : unlit,
+    culling : none
+}
+
+fragment {
+    void material(inout MaterialInputs material) {
+        prepareMaterial(material);
+        material.baseColor.rgb = texture(materialParams_texture, getColor().rg).rgb;
+    }
+}

ios/samples/opengl-with-metal/build-materials.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+set -e
+
+# Compile SampleExternalTexture material.
+
+HOST_TOOLS_PATH="${HOST_TOOLS_PATH:-../../../out/release/filament/bin}"
+matc_path=`find ${HOST_TOOLS_PATH} -name matc -type f | head -n 1`
+
+if [[ ! -e "${matc_path}" ]]; then
+  echo "error: No matc binary could be found in ${HOST_TOOLS_PATH}."
+  echo "error: Ensure Filament has been built/installed before building this app."
+  exit 1
+fi
+
+mkdir -p "${PROJECT_DIR}/generated/"
+"${matc_path}" \
+    --api all \
+    -f header \
+    -o "${PROJECT_DIR}/generated/SampleExternalTexture.inc" \
+    "${PROJECT_DIR}/Materials/SampleExternalTexture.mat"
+
+# FilamentView.mm includes the material, so touch it to force Xcode to recompile it.
+touch "${PROJECT_DIR}/opengl-with-metal/FilamentView.mm"

ios/samples/opengl-with-metal/opengl-with-metal.xcodeproj/project.pbxproj

@@ -0,0 +1,626 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 51;
+	objects = {
+
+/* Begin PBXBuildFile section */
+		037381A6D6D13AA13D79563D /* main.m in Sources */ = {isa = PBXBuildFile; fileRef = 043060C4DDB4C47C75EF968B /* main.m */; };
+		0AB8534CB26606AA32916007 /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 1125C700035D85226683BA8B /* LaunchScreen.storyboard */; };
+		17F46E446C53C4FC74B03678 /* ViewController.m in Sources */ = {isa = PBXBuildFile; fileRef = 35349C2A02D7529C9C4BCF6B /* ViewController.m */; };
+		281DC60C812C87E85F2CE221 /* OpenGLRenderer.m in Sources */ = {isa = PBXBuildFile; fileRef = CCA67E7698F0B56AD9A58A48 /* OpenGLRenderer.m */; };
+		85405FFC40B21CF740624319 /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 706A1DC52266EF64E14FF640 /* Main.storyboard */; };
+		C89FD0AED426B0ACD72D60EA /* FilamentView.mm in Sources */ = {isa = PBXBuildFile; fileRef = CB6C5FD88C436000DD965ADC /* FilamentView.mm */; };
+		C934369EA0A94C164389D173 /* AppDelegate.m in Sources */ = {isa = PBXBuildFile; fileRef = ED4585D5DADDFE0F6A4D062A /* AppDelegate.m */; };
+		CDB6574385173B1ED32A378A /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 98FC2E89E9A22E81B48E07F1 /* Assets.xcassets */; };
+/* End PBXBuildFile section */
+
+/* Begin PBXFileReference section */
+		043060C4DDB4C47C75EF968B /* main.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = main.m; sourceTree = "<group>"; };
+		13E13F807CB56F3012F2754A /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/Main.storyboard; sourceTree = "<group>"; };
+		35349C2A02D7529C9C4BCF6B /* ViewController.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = ViewController.m; sourceTree = "<group>"; };
+		41CD4384CEA9A27EAD1F4E78 /* OpenGLRenderer.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = OpenGLRenderer.h; sourceTree = "<group>"; };
+		41D5A62743118906B18CE880 /* FilamentView.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = FilamentView.h; sourceTree = "<group>"; };
+		50812F7C66F0097C3B943196 /* SampleExternalTexture.mat */ = {isa = PBXFileReference; path = SampleExternalTexture.mat; sourceTree = "<group>"; };
+		8EF3BD853AAF0BBF9C91E2D1 /* AppDelegate.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = AppDelegate.h; sourceTree = "<group>"; };
+		98FC2E89E9A22E81B48E07F1 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
+		ACC14CCCD1CA04F4149A01DC /* ViewController.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = ViewController.h; sourceTree = "<group>"; };
+		C259E1FF8EB7FA3967CDF382 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist; path = Info.plist; sourceTree = "<group>"; };
+		CB6C5FD88C436000DD965ADC /* FilamentView.mm */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.objcpp; path = FilamentView.mm; sourceTree = "<group>"; };
+		CCA67E7698F0B56AD9A58A48 /* OpenGLRenderer.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = OpenGLRenderer.m; sourceTree = "<group>"; };
+		E8488AEBE47D01C1113CE9A7 /* opengl-with-metal.app */ = {isa = PBXFileReference; includeInIndex = 0; lastKnownFileType = wrapper.application; path = "opengl-with-metal.app"; sourceTree = BUILT_PRODUCTS_DIR; };
+		ED4585D5DADDFE0F6A4D062A /* AppDelegate.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = AppDelegate.m; sourceTree = "<group>"; };
+		F19281C87D7C0055DA3B529E /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
+/* End PBXFileReference section */
+
+/* Begin PBXGroup section */
+		45D2C566E5728D79A7DC3D51 /* opengl-with-metal */ = {
+			isa = PBXGroup;
+			children = (
+				8EF3BD853AAF0BBF9C91E2D1 /* AppDelegate.h */,
+				ED4585D5DADDFE0F6A4D062A /* AppDelegate.m */,
+				98FC2E89E9A22E81B48E07F1 /* Assets.xcassets */,
+				41D5A62743118906B18CE880 /* FilamentView.h */,
+				CB6C5FD88C436000DD965ADC /* FilamentView.mm */,
+				C259E1FF8EB7FA3967CDF382 /* Info.plist */,
+				1125C700035D85226683BA8B /* LaunchScreen.storyboard */,
+				043060C4DDB4C47C75EF968B /* main.m */,
+				706A1DC52266EF64E14FF640 /* Main.storyboard */,
+				41CD4384CEA9A27EAD1F4E78 /* OpenGLRenderer.h */,
+				CCA67E7698F0B56AD9A58A48 /* OpenGLRenderer.m */,
+				ACC14CCCD1CA04F4149A01DC /* ViewController.h */,
+				35349C2A02D7529C9C4BCF6B /* ViewController.m */,
+			);
+			path = "opengl-with-metal";
+			sourceTree = "<group>";
+		};
+		60AE3AE6BBC783E012B39C42 = {
+			isa = PBXGroup;
+			children = (
+				8B665C7F795FAFD5DC243AB4 /* Materials */,
+				45D2C566E5728D79A7DC3D51 /* opengl-with-metal */,
+				A9B12968D94EB2DAA0D1AE8F /* Products */,
+			);
+			sourceTree = "<group>";
+		};
+		8B665C7F795FAFD5DC243AB4 /* Materials */ = {
+			isa = PBXGroup;
+			children = (
+				50812F7C66F0097C3B943196 /* SampleExternalTexture.mat */,
+			);
+			path = Materials;
+			sourceTree = "<group>";
+		};
+		A9B12968D94EB2DAA0D1AE8F /* Products */ = {
+			isa = PBXGroup;
+			children = (
+				E8488AEBE47D01C1113CE9A7 /* opengl-with-metal.app */,
+			);
+			name = Products;
+			sourceTree = "<group>";
+		};
+/* End PBXGroup section */
+
+/* Begin PBXNativeTarget section */
+		B0E1B421425E498202D23DDC /* opengl-with-metal */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = 7E2F6625D421C5BF994E927A /* Build configuration list for PBXNativeTarget "opengl-with-metal" */;
+			buildPhases = (
+				01344766CBA21ABB00EAE5C6 /* Build Materials */,
+				E8415BEF9B975206B207CBE9 /* Sources */,
+				DB41346C969215BF2FE36E29 /* Resources */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+			);
+			name = "opengl-with-metal";
+			productName = "opengl-with-metal";
+			productReference = E8488AEBE47D01C1113CE9A7 /* opengl-with-metal.app */;
+			productType = "com.apple.product-type.application";
+		};
+/* End PBXNativeTarget section */
+
+/* Begin PBXProject section */
+		7EE573B8758F17CB9E2909BC /* Project object */ = {
+			isa = PBXProject;
+			attributes = {
+				LastUpgradeCheck = 1200;
+				TargetAttributes = {
+				};
+			};
+			buildConfigurationList = 8A2E8E30287A1D946C1876A1 /* Build configuration list for PBXProject "opengl-with-metal" */;
+			compatibilityVersion = "Xcode 10.0";
+			developmentRegion = en;
+			hasScannedForEncodings = 0;
+			knownRegions = (
+				Base,
+				en,
+			);
+			mainGroup = 60AE3AE6BBC783E012B39C42;
+			projectDirPath = "";
+			projectRoot = "";
+			targets = (
+				B0E1B421425E498202D23DDC /* opengl-with-metal */,
+			);
+		};
+/* End PBXProject section */
+
+/* Begin PBXResourcesBuildPhase section */
+		DB41346C969215BF2FE36E29 /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				CDB6574385173B1ED32A378A /* Assets.xcassets in Resources */,
+				0AB8534CB26606AA32916007 /* LaunchScreen.storyboard in Resources */,
+				85405FFC40B21CF740624319 /* Main.storyboard in Resources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXResourcesBuildPhase section */
+
+/* Begin PBXShellScriptBuildPhase section */
+		01344766CBA21ABB00EAE5C6 /* Build Materials */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputFileListPaths = (
+			);
+			inputPaths = (
+				"$(SRCROOT)/Materials/SampleExternalTexture.mat",
+			);
+			name = "Build Materials";
+			outputFileListPaths = (
+			);
+			outputPaths = (
+				"$(SRCROOT)/generated/SampleExternalTexture.inc",
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "#!/usr/bin/env bash\n\nset -e\n\n# Compile SampleExternalTexture material.\n\nHOST_TOOLS_PATH=\"${HOST_TOOLS_PATH:-../../../out/release/filament/bin}\"\nmatc_path=`find ${HOST_TOOLS_PATH} -name matc -type f | head -n 1`\n\nif [[ ! -e \"${matc_path}\" ]]; then\n  echo \"error: No matc binary could be found in ${HOST_TOOLS_PATH}.\"\n  echo \"error: Ensure Filament has been built/installed before building this app.\"\n  exit 1\nfi\n\nmkdir -p \"${PROJECT_DIR}/generated/\"\n\"${matc_path}\" \\\n    --api all \\\n    -f header \\\n    -o \"${PROJECT_DIR}/generated/SampleExternalTexture.inc\" \\\n    \"${PROJECT_DIR}/Materials/SampleExternalTexture.mat\"\n\n# FilamentView.mm includes the material, so touch it to force Xcode to recompile it.\ntouch \"${PROJECT_DIR}/opengl-with-metal/FilamentView.mm\"\n";
+		};
+/* End PBXShellScriptBuildPhase section */
+
+/* Begin PBXSourcesBuildPhase section */
+		E8415BEF9B975206B207CBE9 /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				C934369EA0A94C164389D173 /* AppDelegate.m in Sources */,
+				C89FD0AED426B0ACD72D60EA /* FilamentView.mm in Sources */,
+				281DC60C812C87E85F2CE221 /* OpenGLRenderer.m in Sources */,
+				17F46E446C53C4FC74B03678 /* ViewController.m in Sources */,
+				037381A6D6D13AA13D79563D /* main.m in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXSourcesBuildPhase section */
+
+/* Begin PBXVariantGroup section */
+		1125C700035D85226683BA8B /* LaunchScreen.storyboard */ = {
+			isa = PBXVariantGroup;
+			children = (
+				F19281C87D7C0055DA3B529E /* Base */,
+			);
+			name = LaunchScreen.storyboard;
+			sourceTree = "<group>";
+		};
+		706A1DC52266EF64E14FF640 /* Main.storyboard */ = {
+			isa = PBXVariantGroup;
+			children = (
+				13E13F807CB56F3012F2754A /* Base */,
+			);
+			name = Main.storyboard;
+			sourceTree = "<group>";
+		};
+/* End PBXVariantGroup section */
+
+/* Begin XCBuildConfiguration section */
+		0697750BEA3FED3189ABC522 /* OpenGL Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CODE_SIGN_IDENTITY = "iPhone Developer";
+				ENABLE_BITCODE = NO;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"FILAMENT_APP_USE_OPENGL=1",
+					"$(inherited)",
+				);
+				HEADER_SEARCH_PATHS = (
+					"../../../out/ios-debug/filament/include",
+					generated,
+				);
+				INFOPLIST_FILE = "opengl-with-metal/Info.plist";
+				IPHONEOS_DEPLOYMENT_TARGET = 12.1;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				LIBRARY_SEARCH_PATHS = (
+					"../../../out/ios-debug/filament/lib/$(CURRENT_ARCH)",
+					"../../../out/ios-debug/filament/lib/universal",
+				);
+				OTHER_LDFLAGS = (
+					"-lfilament",
+					"-lbackend",
+					"-lfilaflat",
+					"-lfilabridge",
+					"-lutils",
+					"-lsmol-v",
+					"-lgeometry",
+					"-libl",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = "${DEVELOPMENT_TEAM}.google.filament.opengl-with-metal";
+				SDKROOT = iphoneos;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = "OpenGL Debug";
+		};
+		1CA256248CDBE5DFCD5C1C9E /* Metal Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CODE_SIGN_IDENTITY = "iPhone Developer";
+				ENABLE_BITCODE = NO;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"FILAMENT_APP_USE_METAL=1",
+					"$(inherited)",
+					GLES_SILENCE_DEPRECATION,
+				);
+				HEADER_SEARCH_PATHS = (
+					"../../../out/ios-release/filament/include",
+					generated,
+				);
+				INFOPLIST_FILE = "opengl-with-metal/Info.plist";
+				IPHONEOS_DEPLOYMENT_TARGET = 12.1;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				LIBRARY_SEARCH_PATHS = (
+					"../../../out/ios-release/filament/lib/$(CURRENT_ARCH)",
+					"../../../out/ios-release/filament/lib/universal",
+				);
+				OTHER_LDFLAGS = (
+					"-lfilament",
+					"-lbackend",
+					"-lfilaflat",
+					"-lfilabridge",
+					"-lutils",
+					"-lsmol-v",
+					"-lgeometry",
+					"-libl",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = "${DEVELOPMENT_TEAM}.google.filament.opengl-with-metal";
+				SDKROOT = iphoneos;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = "Metal Release";
+		};
+		26B8BCC486630D414875157F /* Metal Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
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+}

ios/samples/opengl-with-metal/opengl-with-metal.xcodeproj/project.xcworkspace/contents.xcworkspacedata

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+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
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+   </FileRef>
+</Workspace>

ios/samples/opengl-with-metal/opengl-with-metal.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
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+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
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+	<true/>
+</dict>
+</plist>

ios/samples/opengl-with-metal/opengl-with-metal.xcodeproj/xcshareddata/xcschemes/opengl-with-metal Metal.xcscheme

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ios/samples/opengl-with-metal/opengl-with-metal.xcodeproj/xcshareddata/xcschemes/opengl-with-metal OpenGL.xcscheme

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+   <ProfileAction
+      buildConfiguration = "OpenGL Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "B0E1B421425E498202D23DDC"
+            BuildableName = "opengl-with-metal.app"
+            BlueprintName = "opengl-with-metal"
+            ReferencedContainer = "container:opengl-with-metal.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+      <CommandLineArguments>
+      </CommandLineArguments>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "OpenGL Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "OpenGL Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

ios/samples/opengl-with-metal/opengl-with-metal/AppDelegate.h

@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2022 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.
+ */
+
+#import <UIKit/UIKit.h>
+
+@interface AppDelegate : UIResponder <UIApplicationDelegate>
+
+@property(strong, nonatomic) UIWindow* window;
+
+@end

ios/samples/opengl-with-metal/opengl-with-metal/AppDelegate.m

@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2022 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.
+ */
+
+#import "AppDelegate.h"
+
+@interface AppDelegate ()
+
+@end
+
+@implementation AppDelegate
+
+@end

ios/samples/opengl-with-metal/opengl-with-metal/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,98 @@
+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "76x76",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "76x76",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "83.5x83.5",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ios-marketing",
+      "size" : "1024x1024",
+      "scale" : "1x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

ios/samples/opengl-with-metal/opengl-with-metal/Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

ios/samples/opengl-with-metal/opengl-with-metal/Base.lproj/LaunchScreen.storyboard

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+</document>

ios/samples/opengl-with-metal/opengl-with-metal/Base.lproj/Main.storyboard

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14313.18" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
+    <device id="retina4_7" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14283.14"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="ViewController" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC" customClass="FilamentView">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>

ios/samples/opengl-with-metal/opengl-with-metal/FilamentView.h

@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2022 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.
+ */
+
+#import <UIKit/UIKit.h>
+
+@interface FilamentView : UIView
+
+@end

ios/samples/opengl-with-metal/opengl-with-metal/FilamentView.mm

@@ -0,0 +1,330 @@
+/*
+ * Copyright (C) 2022 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 "FilamentView.h"
+
+#include <filament/Camera.h>
+#include <filament/Engine.h>
+#include <filament/IndexBuffer.h>
+#include <filament/Material.h>
+#include <filament/RenderableManager.h>
+#include <filament/Renderer.h>
+#include <filament/Scene.h>
+#include <filament/Texture.h>
+#include <filament/TextureSampler.h>
+#include <filament/TransformManager.h>
+#include <filament/VertexBuffer.h>
+#include <filament/View.h>
+#include <filament/Viewport.h>
+
+#include <utils/EntityManager.h>
+
+#include <CoreVideo/CoreVideo.h>
+
+#import "OpenGLRenderer.h"
+
+// These defines are set in the "Preprocessor Macros" build setting for each scheme.
+#if !FILAMENT_APP_USE_METAL && !FILAMENT_APP_USE_OPENGL
+#error A valid FILAMENT_APP_USE_ backend define must be set.
+#endif
+
+using namespace filament;
+using utils::Entity;
+using utils::EntityManager;
+
+struct App {
+    VertexBuffer* vb;
+    IndexBuffer* ib;
+    Material* mat;
+    Texture* tex;
+    Entity renderable;
+    CVPixelBufferRef img;
+};
+
+struct Vertex {
+    filament::math::float2 position;
+    uint32_t color;
+};
+
+static const Vertex TRIANGLE_VERTICES[3] = {
+        {{1, 0}, 0xffff0000u},
+        {{cos(M_PI * 2 / 3), sin(M_PI * 2 / 3)}, 0xff00ff00u},
+        {{cos(M_PI * 4 / 3), sin(M_PI * 4 / 3)}, 0xff0000ffu},
+};
+
+static constexpr uint16_t TRIANGLE_INDICES[3] = {0, 1, 2};
+
+// This file is compiled via the matc tool. See the "Run Script" build phase.
+static constexpr uint8_t SAMPLE_EXTERNAL_TEXTURE_PACKAGE[] = {
+#include "SampleExternalTexture.inc"
+};
+
+@implementation FilamentView {
+    Engine* engine;
+    Renderer* renderer;
+    Scene* scene;
+    View* filaView;
+    Camera* camera;
+    SwapChain* swapChain;
+    App app;
+    CADisplayLink* displayLink;
+
+    // The amount of rotation to apply to the camera to offset the device's rotation (in radians)
+    float deviceRotation;
+    float desiredRotation;
+
+    OpenGLRenderer* openglRenderer;
+}
+
+- (instancetype)initWithCoder:(NSCoder*)coder {
+    if (self = [super initWithCoder:coder]) {
+#if FILAMENT_APP_USE_OPENGL
+        [self initializeGLLayer];
+#elif FILAMENT_APP_USE_METAL
+        [self initializeMetalLayer];
+#endif
+        openglRenderer = [OpenGLRenderer new];
+        [self initializeFilament];
+        self.contentScaleFactor = UIScreen.mainScreen.nativeScale;
+    }
+
+    // Call renderloop 60 times a second.
+    displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(renderloop)];
+    displayLink.preferredFramesPerSecond = 60;
+    [displayLink addToRunLoop:NSRunLoop.currentRunLoop forMode:NSDefaultRunLoopMode];
+
+    // Call didRotate when the device orientation changes.
+    [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
+    [[NSNotificationCenter defaultCenter] addObserver:self
+                                             selector:@selector(didRotate:)
+                                                 name:UIDeviceOrientationDidChangeNotification
+                                               object:nil];
+
+    return self;
+}
+
+- (void)dealloc {
+    engine->destroy(renderer);
+    engine->destroy(scene);
+    engine->destroy(filaView);
+    Entity c = camera->getEntity();
+    engine->destroyCameraComponent(c);
+    EntityManager::get().destroy(c);
+    engine->destroy(swapChain);
+    engine->destroy(&engine);
+}
+
+- (void)initializeMetalLayer {
+#if METAL_AVAILABLE
+    CAMetalLayer* metalLayer = (CAMetalLayer*)self.layer;
+    metalLayer.pixelFormat = MTLPixelFormatBGRA8Unorm;
+
+    CGRect nativeBounds = [UIScreen mainScreen].nativeBounds;
+    metalLayer.drawableSize = nativeBounds.size;
+#endif
+}
+
+- (void)initializeGLLayer {
+    CAEAGLLayer* glLayer = (CAEAGLLayer*)self.layer;
+    glLayer.opaque = YES;
+}
+
+- (void)initializeFilament {
+#if FILAMENT_APP_USE_OPENGL
+    engine = Engine::create(filament::Engine::Backend::OPENGL);
+#elif FILAMENT_APP_USE_METAL
+    engine = Engine::create(filament::Engine::Backend::METAL);
+#endif
+    swapChain = engine->createSwapChain((__bridge void*)self.layer);
+    renderer = engine->createRenderer();
+    scene = engine->createScene();
+    Entity c = EntityManager::get().create();
+    camera = engine->createCamera(c);
+    renderer->setClearOptions({.clearColor = {0.1, 0.125, 0.25, 1.0}, .clear = true});
+
+    filaView = engine->createView();
+    filaView->setPostProcessingEnabled(false);
+
+    app.vb = VertexBuffer::Builder()
+                     .vertexCount(3)
+                     .bufferCount(1)
+                     .attribute(VertexAttribute::POSITION, 0, VertexBuffer::AttributeType::FLOAT2,
+                             0, 12)
+                     .attribute(
+                             VertexAttribute::COLOR, 0, VertexBuffer::AttributeType::UBYTE4, 8, 12)
+                     .normalized(VertexAttribute::COLOR)
+                     .build(*engine);
+    app.vb->setBufferAt(*engine, 0, VertexBuffer::BufferDescriptor(TRIANGLE_VERTICES, 36, nullptr));
+
+    app.ib = IndexBuffer::Builder()
+                     .indexCount(3)
+                     .bufferType(IndexBuffer::IndexType::USHORT)
+                     .build(*engine);
+    app.ib->setBuffer(*engine, IndexBuffer::BufferDescriptor(TRIANGLE_INDICES, 6, nullptr));
+
+    app.mat = Material::Builder()
+                      .package((void*)SAMPLE_EXTERNAL_TEXTURE_PACKAGE,
+                              sizeof(SAMPLE_EXTERNAL_TEXTURE_PACKAGE))
+                      .build(*engine);
+
+    app.renderable = EntityManager::get().create();
+    RenderableManager::Builder(1)
+            .boundingBox({{-1, -1, -1}, {1, 1, 1}})
+            .material(0, app.mat->getDefaultInstance())
+            .geometry(0, RenderableManager::PrimitiveType::TRIANGLES, app.vb, app.ib, 0, 3)
+            .culling(false)
+            .receiveShadows(false)
+            .castShadows(false)
+            .build(*engine, app.renderable);
+    scene->addEntity(app.renderable);
+
+    NSDictionary* cvBufferProperties = @{
+        (__bridge NSString*)kCVPixelBufferOpenGLCompatibilityKey : @YES,
+        (__bridge NSString*)kCVPixelBufferMetalCompatibilityKey : @YES,
+    };
+    CVReturn cvret = CVPixelBufferCreate(kCFAllocatorDefault, 1024, 1024, kCVPixelFormatType_32BGRA,
+            (__bridge CFDictionaryRef)cvBufferProperties, &app.img);
+    assert(cvret == kCVReturnSuccess);
+
+    [openglRenderer setPixelBuffer:app.img];
+
+    app.tex = Texture::Builder()
+                      .width(1024)
+                      .height(1024)
+                      .sampler(Texture::Sampler::SAMPLER_EXTERNAL)
+                      .usage(Texture::Usage::SAMPLEABLE)
+                      .build(*engine);
+    app.tex->setExternalImage(*engine, app.img);
+
+    TextureSampler s{};
+    app.mat->getDefaultInstance()->setParameter("texture", app.tex, s);
+
+    filaView->setScene(scene);
+    filaView->setCamera(camera);
+    CGRect nativeBounds = [UIScreen mainScreen].nativeBounds;
+    filaView->setViewport(Viewport(0, 0, nativeBounds.size.width, nativeBounds.size.height));
+}
+
+- (void)renderloop {
+    [self update];
+
+    const Color3 RED{1.0, 0.0, 0.0};
+    const Color3 GREEN{0.0, 1.0, 0.0};
+    const Color3 BLUE{0.0, 0.0, 1.0};
+    const Color3 YELLOW{1.0, 1.0, 0.0};
+    const Color3 CYAN{0.0, 1.0, 1.0};
+    const Color3 PURPLE{1.0, 0.0, 1.0};
+    const Color3 WHITE{1.0, 1.0, 1.0};
+    const Color3 BLACK{0.0, 0.0, 0.0};
+
+// WARNING: Fast color strobing!
+// Sync mode will clear the OpenGL Scene and Filament Scene to the same color, cycling through a
+// list of colors frame-by-frame. This can be used to ensure that OpenGL rendering stays in sync
+// with Filament. With this mode enabled, the triangle should "disappear" and the entire screen
+// should always be a continuous color.
+#define TEST_SYNC 0
+#if TEST_SYNC
+    const Color3 colors[] = {RED, GREEN, BLUE, YELLOW, CYAN, PURPLE, WHITE, BLACK};
+
+    static size_t frameId = 0;
+    const Color3 filamentColor = colors[frameId++ % (sizeof(colors) / sizeof(Color3))];
+    const Color3 openGLColor = filamentColor;
+#else
+    const Color3 filamentColor = BLACK;
+    const Color3 openGLColor = GREEN;
+#endif
+
+    renderer->setClearOptions(
+            {.clearColor = {filamentColor.r, filamentColor.g, filamentColor.b, 1.0},
+                    .clear = true});
+
+    if (self->renderer->beginFrame(self->swapChain)) {
+        // Render OpenGL
+        // TODO: more synchronization might be necessary.
+        // Occasionally, when running in TEST_SYNC mode, the triangle is one color "ahead" of
+        // Filament.
+        [openglRenderer renderWithColor:openGLColor];
+
+        // Render Filament.
+        self->renderer->render(self->filaView);
+        self->renderer->endFrame();
+
+        // This line fixes the synchronization issues, but is highly inefficient:
+        // self->engine->flushAndWait();
+    }
+}
+
+- (void)update {
+    constexpr float ZOOM = 1.5f;
+    const uint32_t w = filaView->getViewport().width;
+    const uint32_t h = filaView->getViewport().height;
+    const float aspect = (float)w / h;
+    camera->setProjection(
+            Camera::Projection::ORTHO, -aspect * ZOOM, aspect * ZOOM, -ZOOM, ZOOM, 0, 1);
+    auto& tcm = engine->getTransformManager();
+
+    [self updateRotation];
+
+    tcm.setTransform(tcm.getInstance(app.renderable),
+            filament::math::mat4f::rotation(CACurrentMediaTime(), filament::math::float3{0, 0, 1}) *
+                    filament::math::mat4f::rotation(
+                            deviceRotation, filament::math::float3{0, 0, 1}));
+}
+
+- (void)didRotate:(NSNotification*)notification {
+    UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];
+    desiredRotation = [self rotationForDeviceOrientation:orientation];
+}
+
+- (void)updateRotation {
+    static const float ROTATION_SPEED = 0.1;
+    float diff = abs(desiredRotation - deviceRotation);
+    if (diff > FLT_EPSILON) {
+        if (desiredRotation > deviceRotation) {
+            deviceRotation += fmin(ROTATION_SPEED, diff);
+        }
+        if (desiredRotation < deviceRotation) {
+            deviceRotation -= fmin(ROTATION_SPEED, diff);
+        }
+    }
+}
+
++ (Class)layerClass {
+#if FILAMENT_APP_USE_OPENGL
+    return [CAEAGLLayer class];
+#elif FILAMENT_APP_USE_METAL
+    return [CAMetalLayer class];
+#endif
+}
+
+- (float)rotationForDeviceOrientation:(UIDeviceOrientation)orientation {
+    switch (orientation) {
+        default:
+        case UIDeviceOrientationPortrait:
+            return 0.0f;
+
+        case UIDeviceOrientationLandscapeRight:
+            return M_PI_2;
+
+        case UIDeviceOrientationLandscapeLeft:
+            return -M_PI_2;
+
+        case UIDeviceOrientationPortraitUpsideDown:
+            return M_PI;
+    }
+}
+
+@end

ios/samples/opengl-with-metal/opengl-with-metal/Info.plist

@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>

ios/samples/opengl-with-metal/opengl-with-metal/OpenGLRenderer.h

@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2022 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.
+ */
+
+#import <CoreVideo/CoreVideo.h>
+#import <Foundation/Foundation.h>
+
+typedef struct {
+    float r;
+    float g;
+    float b;
+} Color3;
+
+@interface OpenGLRenderer : NSObject
+
+- (void)setPixelBuffer:(CVPixelBufferRef)pixelBuffer;
+- (void)renderWithColor:(Color3)color;
+
+@end

ios/samples/opengl-with-metal/opengl-with-metal/OpenGLRenderer.m

@@ -0,0 +1,119 @@
+/*
+ * Copyright (C) 2022 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.
+ */
+
+#import "OpenGLRenderer.h"
+
+#import <QuartzCore/QuartzCore.h>
+
+#include <OpenGLES/ES2/gl.h>
+#include <OpenGLES/ES2/glext.h>
+
+@interface OpenGLRenderer ()
+
+- (void)setupContext;
+- (void)destroyFramebuffer;
+
+@end
+
+#define GL_UNSIGNED_INT_8_8_8_8_REV 0x8367
+
+@implementation OpenGLRenderer {
+    EAGLContext* _context;
+    GLuint _frameBuffer;
+    CVOpenGLESTextureCacheRef _textureCache;
+    CVOpenGLESTextureRef _texture;
+}
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        [self setupContext];
+        _frameBuffer = 0;
+        _texture = nil;
+    }
+    return self;
+}
+
+- (void)setPixelBuffer:(CVPixelBufferRef)pixelBuffer {
+    [EAGLContext setCurrentContext:_context];
+
+    [self destroyFramebuffer];
+
+    if (_texture) {
+        CFRelease(_texture);
+        _texture = nil;
+    }
+
+    if (!pixelBuffer) {
+        return;
+    }
+
+    const size_t width = CVPixelBufferGetWidth(pixelBuffer);
+    const size_t height = CVPixelBufferGetHeight(pixelBuffer);
+    CVReturn cvret = CVOpenGLESTextureCacheCreateTextureFromImage(kCFAllocatorDefault,
+            _textureCache, pixelBuffer, nil, GL_TEXTURE_2D, GL_RGBA, (GLsizei)width,
+            (GLsizei)height, GL_BGRA_EXT, GL_UNSIGNED_INT_8_8_8_8_REV, 0, &_texture);
+    assert(cvret == kCVReturnSuccess);
+
+    glGenFramebuffers(1, &_frameBuffer);
+    glBindFramebuffer(GL_FRAMEBUFFER, _frameBuffer);
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
+            CVOpenGLESTextureGetName(_texture), 0);
+    assert(glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE);
+}
+
+- (void)setupContext {
+    EAGLRenderingAPI api = kEAGLRenderingAPIOpenGLES2;
+    _context = [[EAGLContext alloc] initWithAPI:api];
+    assert(_context);
+
+    BOOL result = [EAGLContext setCurrentContext:_context];
+    assert(result);
+
+    CVReturn cvret =
+            CVOpenGLESTextureCacheCreate(kCFAllocatorDefault, nil, _context, nil, &_textureCache);
+    assert(cvret == kCVReturnSuccess);
+}
+
+- (void)destroyFramebuffer {
+    if (_frameBuffer == 0) {
+        return;
+    }
+
+    glDeleteFramebuffers(1, &_frameBuffer);
+    _frameBuffer = 0;
+}
+
+- (void)renderWithColor:(Color3)color {
+    [EAGLContext setCurrentContext:_context];
+
+    glBindFramebuffer(GL_FRAMEBUFFER, _frameBuffer);
+
+    glClearColor(color.r, color.g, color.b, 1.0);
+    glClear(GL_COLOR_BUFFER_BIT);
+
+    // From Apple's "OpenGLMetalInteroperability" sample:
+    // When rendering to a CVPixelBuffer with OpenGL, call glFlush to ensure OpenGL commands are
+    // excuted on the pixel buffer before Metal reads the buffer.
+    glFlush();
+}
+
+- (void)dealloc {
+    [self setPixelBuffer:nil];
+    CFRelease(_textureCache);
+}
+
+@end

ios/samples/opengl-with-metal/opengl-with-metal/ViewController.h

@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2022 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.
+ */
+
+#import <UIKit/UIKit.h>
+
+@interface ViewController : UIViewController
+
+@end

ios/samples/opengl-with-metal/opengl-with-metal/ViewController.m

@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2022 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.
+ */
+
+#import "ViewController.h"
+
+@interface ViewController ()
+
+@end
+
+@implementation ViewController
+
+- (BOOL)shouldAutorotate {
+    return NO;
+}
+
+@end

ios/samples/opengl-with-metal/opengl-with-metal/main.m

@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2022 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.
+ */
+
+#import <UIKit/UIKit.h>
+#import "AppDelegate.h"
+
+int main(int argc, char* argv[]) {
+    @autoreleasepool {
+        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
+    }
+}

ios/samples/opengl-with-metal/project.yml

@@ -0,0 +1,19 @@
+name: opengl-with-metal
+options:
+    bundleIdPrefix: ${DEVELOPMENT_TEAM}.google.filament
+include: ../app-template.yml
+targets:
+    opengl-with-metal:
+        templates:
+            - FilamentApp
+        preBuildScripts:
+            - path: build-materials.sh
+              name: Build Materials
+              inputFiles:
+                - $(SRCROOT)/Materials/SampleExternalTexture.mat
+              outputFiles:
+                - $(SRCROOT)/generated/SampleExternalTexture.inc
+        settings:
+          configs:
+            metal:
+              GCC_PREPROCESSOR_DEFINITIONS: ["GLES_SILENCE_DEPRECATION"]

ios/samples/opengl-with-metal/run-clang-format.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+
+set -e
+
+clang-format -style=file -i opengl-with-metal/*.h opengl-with-metal/*.m opengl-with-metal/*.mm
+