src/tests/end2end/VideoViewsTests.cpp - dawn - Git at Google

 // Copyright 2021 The Dawn Authors
 //
 // 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 "VideoViewsTests.h"

 #include "utils/ComboRenderPipelineDescriptor.h"
 #include "utils/WGPUHelpers.h"

 VideoViewsTestBackend::PlatformTexture::PlatformTexture(wgpu::Texture&& texture)
     : wgpuTexture(texture) {
 }
 VideoViewsTestBackend::PlatformTexture::~PlatformTexture() = default;

 VideoViewsTestBackend::~VideoViewsTestBackend() = default;

 constexpr std::array<RGBA8, 2> VideoViewsTests::kYellowYUVColor;
 constexpr std::array<RGBA8, 2> VideoViewsTests::kWhiteYUVColor;
 constexpr std::array<RGBA8, 2> VideoViewsTests::kBlueYUVColor;
 constexpr std::array<RGBA8, 2> VideoViewsTests::kRedYUVColor;

 void VideoViewsTests::SetUp() {
     DawnTest::SetUp();
     DAWN_TEST_UNSUPPORTED_IF(UsesWire());
     DAWN_TEST_UNSUPPORTED_IF(!IsMultiPlanarFormatsSupported());

     mBackend = VideoViewsTestBackend::Create();
     mBackend->OnSetUp(device.Get());
 }

 void VideoViewsTests::TearDown() {
     if (!UsesWire() && IsMultiPlanarFormatsSupported()) {
         mBackend->OnTearDown();
     }
     DawnTest::TearDown();
 }

 std::vector<wgpu::FeatureName> VideoViewsTests::GetRequiredFeatures() {
     std::vector<wgpu::FeatureName> requiredFeatures = {};
     mIsMultiPlanarFormatsSupported = SupportsFeatures({wgpu::FeatureName::DawnMultiPlanarFormats});
     if (mIsMultiPlanarFormatsSupported) {
         requiredFeatures.push_back(wgpu::FeatureName::DawnMultiPlanarFormats);
     }
     requiredFeatures.push_back(wgpu::FeatureName::DawnInternalUsages);
     return requiredFeatures;
 }

 bool VideoViewsTests::IsMultiPlanarFormatsSupported() const {
     return mIsMultiPlanarFormatsSupported;
 }

 // Returns a pre-prepared multi-planar formatted texture
 // The encoded texture data represents a 4x4 converted image. When |isCheckerboard| is true,
 // the top left is a 2x2 yellow block, bottom right is a 2x2 red block, top right is a 2x2
 // blue block, and bottom left is a 2x2 white block. When |isCheckerboard| is false, the
 // image is converted from a solid yellow 4x4 block.
 // static
 std::vector<uint8_t> VideoViewsTests::GetTestTextureData(wgpu::TextureFormat format,
                                                          bool isCheckerboard) {
     constexpr uint8_t Yy = kYellowYUVColor[kYUVLumaPlaneIndex].r;
     constexpr uint8_t Yu = kYellowYUVColor[kYUVChromaPlaneIndex].r;
     constexpr uint8_t Yv = kYellowYUVColor[kYUVChromaPlaneIndex].g;

     switch (format) {
         // The first 16 bytes is the luma plane (Y), followed by the chroma plane (UV) which
         // is half the number of bytes (subsampled by 2) but same bytes per line as luma
         // plane.
         case wgpu::TextureFormat::R8BG8Biplanar420Unorm:
             if (isCheckerboard) {
                 constexpr uint8_t Wy = kWhiteYUVColor[kYUVLumaPlaneIndex].r;
                 constexpr uint8_t Wu = kWhiteYUVColor[kYUVChromaPlaneIndex].r;
                 constexpr uint8_t Wv = kWhiteYUVColor[kYUVChromaPlaneIndex].g;

                 constexpr uint8_t Ry = kRedYUVColor[kYUVLumaPlaneIndex].r;
                 constexpr uint8_t Ru = kRedYUVColor[kYUVChromaPlaneIndex].r;
                 constexpr uint8_t Rv = kRedYUVColor[kYUVChromaPlaneIndex].g;

                 constexpr uint8_t By = kBlueYUVColor[kYUVLumaPlaneIndex].r;
                 constexpr uint8_t Bu = kBlueYUVColor[kYUVChromaPlaneIndex].r;
                 constexpr uint8_t Bv = kBlueYUVColor[kYUVChromaPlaneIndex].g;

                 // clang-format off
                         return {
                             Wy, Wy, Ry, Ry, // plane 0, start + 0
                             Wy, Wy, Ry, Ry,
                             Yy, Yy, By, By,
                             Yy, Yy, By, By,
                             Wu, Wv, Ru, Rv, // plane 1, start + 16
                             Yu, Yv, Bu, Bv,
                         };
                 // clang-format on
             } else {
                 // clang-format off
                         return {
                             Yy, Yy, Yy, Yy,  // plane 0, start + 0
                             Yy, Yy, Yy, Yy,
                             Yy, Yy, Yy, Yy,
                             Yy, Yy, Yy, Yy,
                             Yu, Yv, Yu, Yv,  // plane 1, start + 16
                             Yu, Yv, Yu, Yv,
                         };
                 // clang-format on
             }
         default:
             UNREACHABLE();
             return {};
     }
 }

 // Vertex shader used to render a sampled texture into a quad.
 wgpu::ShaderModule VideoViewsTests::GetTestVertexShaderModule() const {
     return utils::CreateShaderModule(device, R"(
                 struct VertexOut {
                     [[location(0)]] texCoord : vec2 <f32>;
                     [[builtin(position)]] position : vec4<f32>;
                 };

                 [[stage(vertex)]]
                 fn main([[builtin(vertex_index)]] VertexIndex : u32) -> VertexOut {
                     var pos = array<vec2<f32>, 6>(
                         vec2<f32>(-1.0, 1.0),
                         vec2<f32>(-1.0, -1.0),
                         vec2<f32>(1.0, -1.0),
                         vec2<f32>(-1.0, 1.0),
                         vec2<f32>(1.0, -1.0),
                         vec2<f32>(1.0, 1.0)
                     );
                     var output : VertexOut;
                     output.position = vec4<f32>(pos[VertexIndex], 0.0, 1.0);
                     output.texCoord = vec2<f32>(output.position.xy * 0.5) + vec2<f32>(0.5, 0.5);
                     return output;
             })");
 }

 // Samples the luminance (Y) plane from an imported NV12 texture into a single channel of an RGBA
 // output attachment and checks for the expected pixel value in the rendered quad.
 TEST_P(VideoViewsTests, NV12SampleYtoR) {
     std::unique_ptr<VideoViewsTestBackend::PlatformTexture> platformTexture =
         mBackend->CreateVideoTextureForTest(wgpu::TextureFormat::R8BG8Biplanar420Unorm,
                                             wgpu::TextureUsage::TextureBinding,
                                             /*isCheckerboard*/ false);
     ASSERT_NE(platformTexture.get(), nullptr);
     if (!platformTexture->CanWrapAsWGPUTexture()) {
         mBackend->DestroyVideoTextureForTest(std::move(platformTexture));
         GTEST_SKIP() << "Skipped because not supported.";
     }
     wgpu::TextureViewDescriptor viewDesc;
     viewDesc.format = wgpu::TextureFormat::R8Unorm;
     viewDesc.aspect = wgpu::TextureAspect::Plane0Only;
     wgpu::TextureView textureView = platformTexture->wgpuTexture.CreateView(&viewDesc);

     utils::ComboRenderPipelineDescriptor renderPipelineDescriptor;
     renderPipelineDescriptor.vertex.module = GetTestVertexShaderModule();

     renderPipelineDescriptor.cFragment.module = utils::CreateShaderModule(device, R"(
             [[group(0), binding(0)]] var sampler0 : sampler;
             [[group(0), binding(1)]] var texture : texture_2d<f32>;

             [[stage(fragment)]]
             fn main([[location(0)]] texCoord : vec2<f32>) -> [[location(0)]] vec4<f32> {
                let y : f32 = textureSample(texture, sampler0, texCoord).r;
                return vec4<f32>(y, 0.0, 0.0, 1.0);
             })");

     utils::BasicRenderPass renderPass = utils::CreateBasicRenderPass(
         device, kYUVImageDataWidthInTexels, kYUVImageDataHeightInTexels);
     renderPipelineDescriptor.cTargets[0].format = renderPass.colorFormat;
     renderPipelineDescriptor.primitive.topology = wgpu::PrimitiveTopology::TriangleList;

     wgpu::RenderPipeline renderPipeline = device.CreateRenderPipeline(&renderPipelineDescriptor);

     wgpu::Sampler sampler = device.CreateSampler();

     wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
     {
         wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPass.renderPassInfo);
         pass.SetPipeline(renderPipeline);
         pass.SetBindGroup(0, utils::MakeBindGroup(device, renderPipeline.GetBindGroupLayout(0),
                                                   {{0, sampler}, {1, textureView}}));
         pass.Draw(6);
         pass.EndPass();
     }

     wgpu::CommandBuffer commands = encoder.Finish();
     queue.Submit(1, &commands);

     // Test the luma plane in the top left corner of RGB image.
     EXPECT_PIXEL_RGBA8_EQ(kYellowYUVColor[kYUVLumaPlaneIndex], renderPass.color, 0, 0);
     mBackend->DestroyVideoTextureForTest(std::move(platformTexture));
 }

 // Samples the chrominance (UV) plane from an imported texture into two channels of an RGBA output
 // attachment and checks for the expected pixel value in the rendered quad.
 TEST_P(VideoViewsTests, NV12SampleUVtoRG) {
     std::unique_ptr<VideoViewsTestBackend::PlatformTexture> platformTexture =
         mBackend->CreateVideoTextureForTest(wgpu::TextureFormat::R8BG8Biplanar420Unorm,
                                             wgpu::TextureUsage::TextureBinding,
                                             /*isCheckerboard*/ false);
     ASSERT_NE(platformTexture.get(), nullptr);
     if (!platformTexture->CanWrapAsWGPUTexture()) {
         mBackend->DestroyVideoTextureForTest(std::move(platformTexture));
         GTEST_SKIP() << "Skipped because not supported.";
     }

     wgpu::TextureViewDescriptor viewDesc;
     viewDesc.format = wgpu::TextureFormat::RG8Unorm;
     viewDesc.aspect = wgpu::TextureAspect::Plane1Only;
     wgpu::TextureView textureView = platformTexture->wgpuTexture.CreateView(&viewDesc);

     utils::ComboRenderPipelineDescriptor renderPipelineDescriptor;
     renderPipelineDescriptor.vertex.module = GetTestVertexShaderModule();

     renderPipelineDescriptor.cFragment.module = utils::CreateShaderModule(device, R"(
             [[group(0), binding(0)]] var sampler0 : sampler;
             [[group(0), binding(1)]] var texture : texture_2d<f32>;

             [[stage(fragment)]]
             fn main([[location(0)]] texCoord : vec2<f32>) -> [[location(0)]] vec4<f32> {
                let u : f32 = textureSample(texture, sampler0, texCoord).r;
                let v : f32 = textureSample(texture, sampler0, texCoord).g;
                return vec4<f32>(u, v, 0.0, 1.0);
             })");

     utils::BasicRenderPass renderPass = utils::CreateBasicRenderPass(
         device, kYUVImageDataWidthInTexels, kYUVImageDataHeightInTexels);
     renderPipelineDescriptor.cTargets[0].format = renderPass.colorFormat;
     renderPipelineDescriptor.primitive.topology = wgpu::PrimitiveTopology::TriangleList;

     wgpu::RenderPipeline renderPipeline = device.CreateRenderPipeline(&renderPipelineDescriptor);

     wgpu::Sampler sampler = device.CreateSampler();

     wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
     {
         wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPass.renderPassInfo);
         pass.SetPipeline(renderPipeline);
         pass.SetBindGroup(0, utils::MakeBindGroup(device, renderPipeline.GetBindGroupLayout(0),
                                                   {{0, sampler}, {1, textureView}}));
         pass.Draw(6);
         pass.EndPass();
     }

     wgpu::CommandBuffer commands = encoder.Finish();
     queue.Submit(1, &commands);

     // Test the chroma plane in the top left corner of RGB image.
     EXPECT_PIXEL_RGBA8_EQ(kYellowYUVColor[kYUVChromaPlaneIndex], renderPass.color, 0, 0);
     mBackend->DestroyVideoTextureForTest(std::move(platformTexture));
 }

 // Renders a NV12 "checkerboard" texture into a RGB quad then checks the color at specific
 // points to ensure the image has not been flipped.
 TEST_P(VideoViewsTests, NV12SampleYUVtoRGB) {
     // TODO(https://crbug.com/dawn/733): Figure out why Nvidia bot occasionally fails testing all
     // four corners.
     DAWN_SUPPRESS_TEST_IF(IsNvidia());

     std::unique_ptr<VideoViewsTestBackend::PlatformTexture> platformTexture =
         mBackend->CreateVideoTextureForTest(wgpu::TextureFormat::R8BG8Biplanar420Unorm,
                                             wgpu::TextureUsage::TextureBinding,
                                             /*isCheckerboard*/ true);
     ASSERT_NE(platformTexture.get(), nullptr);
     if (!platformTexture->CanWrapAsWGPUTexture()) {
         mBackend->DestroyVideoTextureForTest(std::move(platformTexture));
         GTEST_SKIP() << "Skipped because not supported.";
     }

     wgpu::TextureViewDescriptor lumaViewDesc;
     lumaViewDesc.format = wgpu::TextureFormat::R8Unorm;
     lumaViewDesc.aspect = wgpu::TextureAspect::Plane0Only;
     wgpu::TextureView lumaTextureView = platformTexture->wgpuTexture.CreateView(&lumaViewDesc);

     wgpu::TextureViewDescriptor chromaViewDesc;
     chromaViewDesc.format = wgpu::TextureFormat::RG8Unorm;
     chromaViewDesc.aspect = wgpu::TextureAspect::Plane1Only;
     wgpu::TextureView chromaTextureView = platformTexture->wgpuTexture.CreateView(&chromaViewDesc);

     utils::ComboRenderPipelineDescriptor renderPipelineDescriptor;
     renderPipelineDescriptor.vertex.module = GetTestVertexShaderModule();

     renderPipelineDescriptor.cFragment.module = utils::CreateShaderModule(device, R"(
             [[group(0), binding(0)]] var sampler0 : sampler;
             [[group(0), binding(1)]] var lumaTexture : texture_2d<f32>;
             [[group(0), binding(2)]] var chromaTexture : texture_2d<f32>;

             [[stage(fragment)]]
             fn main([[location(0)]] texCoord : vec2<f32>) -> [[location(0)]] vec4<f32> {
                let y : f32 = textureSample(lumaTexture, sampler0, texCoord).r;
                let u : f32 = textureSample(chromaTexture, sampler0, texCoord).r;
                let v : f32 = textureSample(chromaTexture, sampler0, texCoord).g;
                return vec4<f32>(y, u, v, 1.0);
             })");

     utils::BasicRenderPass renderPass = utils::CreateBasicRenderPass(
         device, kYUVImageDataWidthInTexels, kYUVImageDataHeightInTexels);
     renderPipelineDescriptor.cTargets[0].format = renderPass.colorFormat;

     wgpu::RenderPipeline renderPipeline = device.CreateRenderPipeline(&renderPipelineDescriptor);

     wgpu::Sampler sampler = device.CreateSampler();

     wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
     {
         wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPass.renderPassInfo);
         pass.SetPipeline(renderPipeline);
         pass.SetBindGroup(
             0, utils::MakeBindGroup(device, renderPipeline.GetBindGroupLayout(0),
                                     {{0, sampler}, {1, lumaTextureView}, {2, chromaTextureView}}));
         pass.Draw(6);
         pass.EndPass();
     }

     wgpu::CommandBuffer commands = encoder.Finish();
     queue.Submit(1, &commands);

     // Test four corners of the checkerboard image (YUV color space).
     RGBA8 yellowYUV(kYellowYUVColor[kYUVLumaPlaneIndex].r, kYellowYUVColor[kYUVChromaPlaneIndex].r,
                     kYellowYUVColor[kYUVChromaPlaneIndex].g, 0xFF);
     EXPECT_PIXEL_RGBA8_EQ(yellowYUV, renderPass.color, 0, 0);  // top left

     RGBA8 redYUV(kRedYUVColor[kYUVLumaPlaneIndex].r, kRedYUVColor[kYUVChromaPlaneIndex].r,
                  kRedYUVColor[kYUVChromaPlaneIndex].g, 0xFF);
     EXPECT_PIXEL_RGBA8_EQ(redYUV, renderPass.color, kYUVImageDataWidthInTexels - 1,
                           kYUVImageDataHeightInTexels - 1);  // bottom right

     RGBA8 blueYUV(kBlueYUVColor[kYUVLumaPlaneIndex].r, kBlueYUVColor[kYUVChromaPlaneIndex].r,
                   kBlueYUVColor[kYUVChromaPlaneIndex].g, 0xFF);
     EXPECT_PIXEL_RGBA8_EQ(blueYUV, renderPass.color, kYUVImageDataWidthInTexels - 1,
                           0);  // top right

     RGBA8 whiteYUV(kWhiteYUVColor[kYUVLumaPlaneIndex].r, kWhiteYUVColor[kYUVChromaPlaneIndex].r,
                    kWhiteYUVColor[kYUVChromaPlaneIndex].g, 0xFF);
     EXPECT_PIXEL_RGBA8_EQ(whiteYUV, renderPass.color, 0,
                           kYUVImageDataHeightInTexels - 1);  // bottom left
     mBackend->DestroyVideoTextureForTest(std::move(platformTexture));
 }

 DAWN_INSTANTIATE_TEST(VideoViewsTests, VideoViewsTestBackend::Backend());
	// Copyright 2021 The Dawn Authors
	//
	// 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 "VideoViewsTests.h"

	#include "utils/ComboRenderPipelineDescriptor.h"
	#include "utils/WGPUHelpers.h"

	VideoViewsTestBackend::PlatformTexture::PlatformTexture(wgpu::Texture&& texture)
	: wgpuTexture(texture) {
	}
	VideoViewsTestBackend::PlatformTexture::~PlatformTexture() = default;

	VideoViewsTestBackend::~VideoViewsTestBackend() = default;

	constexpr std::array<RGBA8, 2> VideoViewsTests::kYellowYUVColor;
	constexpr std::array<RGBA8, 2> VideoViewsTests::kWhiteYUVColor;
	constexpr std::array<RGBA8, 2> VideoViewsTests::kBlueYUVColor;
	constexpr std::array<RGBA8, 2> VideoViewsTests::kRedYUVColor;

	void VideoViewsTests::SetUp() {
	DawnTest::SetUp();
	DAWN_TEST_UNSUPPORTED_IF(UsesWire());
	DAWN_TEST_UNSUPPORTED_IF(!IsMultiPlanarFormatsSupported());

	mBackend = VideoViewsTestBackend::Create();
	mBackend->OnSetUp(device.Get());
	}

	void VideoViewsTests::TearDown() {
	if (!UsesWire() && IsMultiPlanarFormatsSupported()) {
	mBackend->OnTearDown();
	}
	DawnTest::TearDown();
	}

	std::vector<wgpu::FeatureName> VideoViewsTests::GetRequiredFeatures() {
	std::vector<wgpu::FeatureName> requiredFeatures = {};
	mIsMultiPlanarFormatsSupported = SupportsFeatures({wgpu::FeatureName::DawnMultiPlanarFormats});
	if (mIsMultiPlanarFormatsSupported) {
	requiredFeatures.push_back(wgpu::FeatureName::DawnMultiPlanarFormats);
	}
	requiredFeatures.push_back(wgpu::FeatureName::DawnInternalUsages);
	return requiredFeatures;
	}

	bool VideoViewsTests::IsMultiPlanarFormatsSupported() const {
	return mIsMultiPlanarFormatsSupported;
	}

	// Returns a pre-prepared multi-planar formatted texture
	// The encoded texture data represents a 4x4 converted image. When \|isCheckerboard\| is true,
	// the top left is a 2x2 yellow block, bottom right is a 2x2 red block, top right is a 2x2
	// blue block, and bottom left is a 2x2 white block. When \|isCheckerboard\| is false, the
	// image is converted from a solid yellow 4x4 block.
	// static
	std::vector<uint8_t> VideoViewsTests::GetTestTextureData(wgpu::TextureFormat format,
	bool isCheckerboard) {
	constexpr uint8_t Yy = kYellowYUVColor[kYUVLumaPlaneIndex].r;
	constexpr uint8_t Yu = kYellowYUVColor[kYUVChromaPlaneIndex].r;
	constexpr uint8_t Yv = kYellowYUVColor[kYUVChromaPlaneIndex].g;

	switch (format) {
	// The first 16 bytes is the luma plane (Y), followed by the chroma plane (UV) which
	// is half the number of bytes (subsampled by 2) but same bytes per line as luma
	// plane.
	case wgpu::TextureFormat::R8BG8Biplanar420Unorm:
	if (isCheckerboard) {
	constexpr uint8_t Wy = kWhiteYUVColor[kYUVLumaPlaneIndex].r;
	constexpr uint8_t Wu = kWhiteYUVColor[kYUVChromaPlaneIndex].r;
	constexpr uint8_t Wv = kWhiteYUVColor[kYUVChromaPlaneIndex].g;

	constexpr uint8_t Ry = kRedYUVColor[kYUVLumaPlaneIndex].r;
	constexpr uint8_t Ru = kRedYUVColor[kYUVChromaPlaneIndex].r;
	constexpr uint8_t Rv = kRedYUVColor[kYUVChromaPlaneIndex].g;

	constexpr uint8_t By = kBlueYUVColor[kYUVLumaPlaneIndex].r;
	constexpr uint8_t Bu = kBlueYUVColor[kYUVChromaPlaneIndex].r;
	constexpr uint8_t Bv = kBlueYUVColor[kYUVChromaPlaneIndex].g;

	// clang-format off
	return {
	Wy, Wy, Ry, Ry, // plane 0, start + 0
	Wy, Wy, Ry, Ry,
	Yy, Yy, By, By,
	Yy, Yy, By, By,
	Wu, Wv, Ru, Rv, // plane 1, start + 16
	Yu, Yv, Bu, Bv,
	};
	// clang-format on
	} else {
	// clang-format off
	return {
	Yy, Yy, Yy, Yy, // plane 0, start + 0
	Yy, Yy, Yy, Yy,
	Yy, Yy, Yy, Yy,
	Yy, Yy, Yy, Yy,
	Yu, Yv, Yu, Yv, // plane 1, start + 16
	Yu, Yv, Yu, Yv,
	};
	// clang-format on
	}
	default:
	UNREACHABLE();
	return {};
	}
	}

	// Vertex shader used to render a sampled texture into a quad.
	wgpu::ShaderModule VideoViewsTests::GetTestVertexShaderModule() const {
	return utils::CreateShaderModule(device, R"(
	struct VertexOut {
	[[location(0)]] texCoord : vec2 <f32>;
	[[builtin(position)]] position : vec4<f32>;
	};

	[[stage(vertex)]]
	fn main([[builtin(vertex_index)]] VertexIndex : u32) -> VertexOut {
	var pos = array<vec2<f32>, 6>(
	vec2<f32>(-1.0, 1.0),
	vec2<f32>(-1.0, -1.0),
	vec2<f32>(1.0, -1.0),
	vec2<f32>(-1.0, 1.0),
	vec2<f32>(1.0, -1.0),
	vec2<f32>(1.0, 1.0)
	);
	var output : VertexOut;
	output.position = vec4<f32>(pos[VertexIndex], 0.0, 1.0);
	output.texCoord = vec2<f32>(output.position.xy * 0.5) + vec2<f32>(0.5, 0.5);
	return output;
	})");
	}

	// Samples the luminance (Y) plane from an imported NV12 texture into a single channel of an RGBA
	// output attachment and checks for the expected pixel value in the rendered quad.
	TEST_P(VideoViewsTests, NV12SampleYtoR) {
	std::unique_ptr<VideoViewsTestBackend::PlatformTexture> platformTexture =
	mBackend->CreateVideoTextureForTest(wgpu::TextureFormat::R8BG8Biplanar420Unorm,
	wgpu::TextureUsage::TextureBinding,
	/isCheckerboard/ false);
	ASSERT_NE(platformTexture.get(), nullptr);
	if (!platformTexture->CanWrapAsWGPUTexture()) {
	mBackend->DestroyVideoTextureForTest(std::move(platformTexture));
	GTEST_SKIP() << "Skipped because not supported.";
	}
	wgpu::TextureViewDescriptor viewDesc;
	viewDesc.format = wgpu::TextureFormat::R8Unorm;
	viewDesc.aspect = wgpu::TextureAspect::Plane0Only;
	wgpu::TextureView textureView = platformTexture->wgpuTexture.CreateView(&viewDesc);

	utils::ComboRenderPipelineDescriptor renderPipelineDescriptor;
	renderPipelineDescriptor.vertex.module = GetTestVertexShaderModule();

	renderPipelineDescriptor.cFragment.module = utils::CreateShaderModule(device, R"(
	[[group(0), binding(0)]] var sampler0 : sampler;
	[[group(0), binding(1)]] var texture : texture_2d<f32>;

	[[stage(fragment)]]
	fn main([[location(0)]] texCoord : vec2<f32>) -> [[location(0)]] vec4<f32> {
	let y : f32 = textureSample(texture, sampler0, texCoord).r;
	return vec4<f32>(y, 0.0, 0.0, 1.0);
	})");

	utils::BasicRenderPass renderPass = utils::CreateBasicRenderPass(
	device, kYUVImageDataWidthInTexels, kYUVImageDataHeightInTexels);
	renderPipelineDescriptor.cTargets[0].format = renderPass.colorFormat;
	renderPipelineDescriptor.primitive.topology = wgpu::PrimitiveTopology::TriangleList;

	wgpu::RenderPipeline renderPipeline = device.CreateRenderPipeline(&renderPipelineDescriptor);

	wgpu::Sampler sampler = device.CreateSampler();

	wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
	{
	wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPass.renderPassInfo);
	pass.SetPipeline(renderPipeline);
	pass.SetBindGroup(0, utils::MakeBindGroup(device, renderPipeline.GetBindGroupLayout(0),
	{{0, sampler}, {1, textureView}}));
	pass.Draw(6);
	pass.EndPass();
	}

	wgpu::CommandBuffer commands = encoder.Finish();
	queue.Submit(1, &commands);

	// Test the luma plane in the top left corner of RGB image.
	EXPECT_PIXEL_RGBA8_EQ(kYellowYUVColor[kYUVLumaPlaneIndex], renderPass.color, 0, 0);
	mBackend->DestroyVideoTextureForTest(std::move(platformTexture));
	}

	// Samples the chrominance (UV) plane from an imported texture into two channels of an RGBA output
	// attachment and checks for the expected pixel value in the rendered quad.
	TEST_P(VideoViewsTests, NV12SampleUVtoRG) {
	std::unique_ptr<VideoViewsTestBackend::PlatformTexture> platformTexture =
	mBackend->CreateVideoTextureForTest(wgpu::TextureFormat::R8BG8Biplanar420Unorm,
	wgpu::TextureUsage::TextureBinding,
	/isCheckerboard/ false);
	ASSERT_NE(platformTexture.get(), nullptr);
	if (!platformTexture->CanWrapAsWGPUTexture()) {
	mBackend->DestroyVideoTextureForTest(std::move(platformTexture));
	GTEST_SKIP() << "Skipped because not supported.";
	}

	wgpu::TextureViewDescriptor viewDesc;
	viewDesc.format = wgpu::TextureFormat::RG8Unorm;
	viewDesc.aspect = wgpu::TextureAspect::Plane1Only;
	wgpu::TextureView textureView = platformTexture->wgpuTexture.CreateView(&viewDesc);

	utils::ComboRenderPipelineDescriptor renderPipelineDescriptor;
	renderPipelineDescriptor.vertex.module = GetTestVertexShaderModule();

	renderPipelineDescriptor.cFragment.module = utils::CreateShaderModule(device, R"(
	[[group(0), binding(0)]] var sampler0 : sampler;
	[[group(0), binding(1)]] var texture : texture_2d<f32>;

	[[stage(fragment)]]
	fn main([[location(0)]] texCoord : vec2<f32>) -> [[location(0)]] vec4<f32> {
	let u : f32 = textureSample(texture, sampler0, texCoord).r;
	let v : f32 = textureSample(texture, sampler0, texCoord).g;
	return vec4<f32>(u, v, 0.0, 1.0);
	})");

	utils::BasicRenderPass renderPass = utils::CreateBasicRenderPass(
	device, kYUVImageDataWidthInTexels, kYUVImageDataHeightInTexels);
	renderPipelineDescriptor.cTargets[0].format = renderPass.colorFormat;
	renderPipelineDescriptor.primitive.topology = wgpu::PrimitiveTopology::TriangleList;

	wgpu::RenderPipeline renderPipeline = device.CreateRenderPipeline(&renderPipelineDescriptor);

	wgpu::Sampler sampler = device.CreateSampler();

	wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
	{
	wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPass.renderPassInfo);
	pass.SetPipeline(renderPipeline);
	pass.SetBindGroup(0, utils::MakeBindGroup(device, renderPipeline.GetBindGroupLayout(0),
	{{0, sampler}, {1, textureView}}));
	pass.Draw(6);
	pass.EndPass();
	}

	wgpu::CommandBuffer commands = encoder.Finish();
	queue.Submit(1, &commands);

	// Test the chroma plane in the top left corner of RGB image.
	EXPECT_PIXEL_RGBA8_EQ(kYellowYUVColor[kYUVChromaPlaneIndex], renderPass.color, 0, 0);
	mBackend->DestroyVideoTextureForTest(std::move(platformTexture));
	}

	// Renders a NV12 "checkerboard" texture into a RGB quad then checks the color at specific
	// points to ensure the image has not been flipped.
	TEST_P(VideoViewsTests, NV12SampleYUVtoRGB) {
	// TODO(https://crbug.com/dawn/733): Figure out why Nvidia bot occasionally fails testing all
	// four corners.
	DAWN_SUPPRESS_TEST_IF(IsNvidia());

	std::unique_ptr<VideoViewsTestBackend::PlatformTexture> platformTexture =
	mBackend->CreateVideoTextureForTest(wgpu::TextureFormat::R8BG8Biplanar420Unorm,
	wgpu::TextureUsage::TextureBinding,
	/isCheckerboard/ true);
	ASSERT_NE(platformTexture.get(), nullptr);
	if (!platformTexture->CanWrapAsWGPUTexture()) {
	mBackend->DestroyVideoTextureForTest(std::move(platformTexture));
	GTEST_SKIP() << "Skipped because not supported.";
	}

	wgpu::TextureViewDescriptor lumaViewDesc;
	lumaViewDesc.format = wgpu::TextureFormat::R8Unorm;
	lumaViewDesc.aspect = wgpu::TextureAspect::Plane0Only;
	wgpu::TextureView lumaTextureView = platformTexture->wgpuTexture.CreateView(&lumaViewDesc);

	wgpu::TextureViewDescriptor chromaViewDesc;
	chromaViewDesc.format = wgpu::TextureFormat::RG8Unorm;
	chromaViewDesc.aspect = wgpu::TextureAspect::Plane1Only;
	wgpu::TextureView chromaTextureView = platformTexture->wgpuTexture.CreateView(&chromaViewDesc);

	utils::ComboRenderPipelineDescriptor renderPipelineDescriptor;
	renderPipelineDescriptor.vertex.module = GetTestVertexShaderModule();

	renderPipelineDescriptor.cFragment.module = utils::CreateShaderModule(device, R"(
	[[group(0), binding(0)]] var sampler0 : sampler;
	[[group(0), binding(1)]] var lumaTexture : texture_2d<f32>;
	[[group(0), binding(2)]] var chromaTexture : texture_2d<f32>;

	[[stage(fragment)]]
	fn main([[location(0)]] texCoord : vec2<f32>) -> [[location(0)]] vec4<f32> {
	let y : f32 = textureSample(lumaTexture, sampler0, texCoord).r;
	let u : f32 = textureSample(chromaTexture, sampler0, texCoord).r;
	let v : f32 = textureSample(chromaTexture, sampler0, texCoord).g;
	return vec4<f32>(y, u, v, 1.0);
	})");

	utils::BasicRenderPass renderPass = utils::CreateBasicRenderPass(
	device, kYUVImageDataWidthInTexels, kYUVImageDataHeightInTexels);
	renderPipelineDescriptor.cTargets[0].format = renderPass.colorFormat;

	wgpu::RenderPipeline renderPipeline = device.CreateRenderPipeline(&renderPipelineDescriptor);

	wgpu::Sampler sampler = device.CreateSampler();

	wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
	{
	wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPass.renderPassInfo);
	pass.SetPipeline(renderPipeline);
	pass.SetBindGroup(
	0, utils::MakeBindGroup(device, renderPipeline.GetBindGroupLayout(0),
	{{0, sampler}, {1, lumaTextureView}, {2, chromaTextureView}}));
	pass.Draw(6);
	pass.EndPass();
	}

	wgpu::CommandBuffer commands = encoder.Finish();
	queue.Submit(1, &commands);

	// Test four corners of the checkerboard image (YUV color space).
	RGBA8 yellowYUV(kYellowYUVColor[kYUVLumaPlaneIndex].r, kYellowYUVColor[kYUVChromaPlaneIndex].r,
	kYellowYUVColor[kYUVChromaPlaneIndex].g, 0xFF);
	EXPECT_PIXEL_RGBA8_EQ(yellowYUV, renderPass.color, 0, 0); // top left

	RGBA8 redYUV(kRedYUVColor[kYUVLumaPlaneIndex].r, kRedYUVColor[kYUVChromaPlaneIndex].r,
	kRedYUVColor[kYUVChromaPlaneIndex].g, 0xFF);
	EXPECT_PIXEL_RGBA8_EQ(redYUV, renderPass.color, kYUVImageDataWidthInTexels - 1,
	kYUVImageDataHeightInTexels - 1); // bottom right

	RGBA8 blueYUV(kBlueYUVColor[kYUVLumaPlaneIndex].r, kBlueYUVColor[kYUVChromaPlaneIndex].r,
	kBlueYUVColor[kYUVChromaPlaneIndex].g, 0xFF);
	EXPECT_PIXEL_RGBA8_EQ(blueYUV, renderPass.color, kYUVImageDataWidthInTexels - 1,
	0); // top right

	RGBA8 whiteYUV(kWhiteYUVColor[kYUVLumaPlaneIndex].r, kWhiteYUVColor[kYUVChromaPlaneIndex].r,
	kWhiteYUVColor[kYUVChromaPlaneIndex].g, 0xFF);
	EXPECT_PIXEL_RGBA8_EQ(whiteYUV, renderPass.color, 0,
	kYUVImageDataHeightInTexels - 1); // bottom left
	mBackend->DestroyVideoTextureForTest(std::move(platformTexture));
	}

	DAWN_INSTANTIATE_TEST(VideoViewsTests, VideoViewsTestBackend::Backend());