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

 // Copyright 2018 The Dawn & Tint Authors
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are met:
 //
 // 1. Redistributions of source code must retain the above copyright notice, this
 //    list of conditions and the following disclaimer.
 //
 // 2. Redistributions in binary form must reproduce the above copyright notice,
 //    this list of conditions and the following disclaimer in the documentation
 //    and/or other materials provided with the distribution.
 //
 // 3. Neither the name of the copyright holder nor the names of its
 //    contributors may be used to endorse or promote products derived from
 //    this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 #include <array>
 #include <cmath>
 #include <vector>

 #include "dawn/tests/DawnTest.h"

 #include "dawn/common/Assert.h"
 #include "dawn/common/Constants.h"
 #include "dawn/utils/ComboRenderPipelineDescriptor.h"
 #include "dawn/utils/WGPUHelpers.h"

 namespace dawn {
 namespace {

 constexpr static unsigned int kRTSize = 64;

 const char* kBasicFS = R"(
             @group(0) @binding(0) var sampler0 : sampler;
             @group(0) @binding(1) var texture0 : texture_2d<f32>;

             @fragment
             fn main(@builtin(position) FragCoord : vec4f) -> @location(0) vec4f {
                 return textureSample(texture0, sampler0, FragCoord.xy / vec2(2.0, 2.0));
             })";

 const char* kPassThroughUserFunctionsFS = R"(
             @group(0) @binding(0) var sampler0 : sampler;
             @group(0) @binding(1) var texture0 : texture_2d<f32>;

             fn foo(t : texture_2d<f32>, s : sampler, FragCoord : vec4f) -> vec4f {
                 return textureSample(t, s, FragCoord.xy / vec2(2.0, 2.0));
             }

             @fragment
             fn main(@builtin(position) FragCoord : vec4f) -> @location(0) vec4f {
                 return foo(texture0, sampler0, FragCoord);
             })";

 struct AddressModeTestCase {
     wgpu::AddressMode mMode;
     uint8_t mExpected2;
     uint8_t mExpected3;
 };
 AddressModeTestCase addressModes[] = {
     {
         wgpu::AddressMode::Repeat,
         0,
         255,
     },
     {
         wgpu::AddressMode::MirrorRepeat,
         255,
         0,
     },
     {
         wgpu::AddressMode::ClampToEdge,
         255,
         255,
     },
 };

 class SamplerTest : public DawnTest {
   protected:
     void SetUp() override {
         DawnTest::SetUp();
         mRenderPass = utils::CreateBasicRenderPass(device, kRTSize, kRTSize);

         wgpu::TextureDescriptor descriptor;
         descriptor.dimension = wgpu::TextureDimension::e2D;
         descriptor.size.width = 2;
         descriptor.size.height = 2;
         descriptor.size.depthOrArrayLayers = 1;
         descriptor.sampleCount = 1;
         descriptor.format = wgpu::TextureFormat::RGBA8Unorm;
         descriptor.mipLevelCount = 1;
         descriptor.usage = wgpu::TextureUsage::CopyDst | wgpu::TextureUsage::TextureBinding;
         wgpu::Texture texture = device.CreateTexture(&descriptor);

         // Create a 2x2 checkerboard texture, with black in the top left and bottom right corners.
         const uint32_t rowPixels = kTextureBytesPerRowAlignment / sizeof(utils::RGBA8);
         std::array<utils::RGBA8, rowPixels * 2> pixels;
         pixels[0] = pixels[rowPixels + 1] = utils::RGBA8::kBlack;
         pixels[1] = pixels[rowPixels] = utils::RGBA8::kWhite;

         wgpu::Buffer stagingBuffer =
             utils::CreateBufferFromData(device, pixels.data(), pixels.size() * sizeof(utils::RGBA8),
                                         wgpu::BufferUsage::CopySrc);
         wgpu::ImageCopyBuffer imageCopyBuffer = utils::CreateImageCopyBuffer(stagingBuffer, 0, 256);
         wgpu::ImageCopyTexture imageCopyTexture =
             utils::CreateImageCopyTexture(texture, 0, {0, 0, 0});
         wgpu::Extent3D copySize = {2, 2, 1};

         wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
         encoder.CopyBufferToTexture(&imageCopyBuffer, &imageCopyTexture, &copySize);

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

         mTextureView = texture.CreateView();
     }

     // Initializes the pipeline used by tests. Uses `bgl` to set the pipeline
     // layout if it is non-null; otherwise the pipeline is constructed with the
     // default layout.
     void InitShaders(const char* frag_shader, wgpu::BindGroupLayout bgl = nullptr) {
         auto vsModule = utils::CreateShaderModule(device, R"(
             @vertex
             fn main(@builtin(vertex_index) VertexIndex : u32) -> @builtin(position) vec4f {
                 var pos = array(
                     vec2f(-2.0, -2.0),
                     vec2f(-2.0,  2.0),
                     vec2f( 2.0, -2.0),
                     vec2f(-2.0,  2.0),
                     vec2f( 2.0, -2.0),
                     vec2f( 2.0,  2.0));
                 return vec4f(pos[VertexIndex], 0.0, 1.0);
             }
         )");
         auto fsModule = utils::CreateShaderModule(device, frag_shader);

         utils::ComboRenderPipelineDescriptor pipelineDescriptor;

         if (bgl) {
             wgpu::PipelineLayout pl = utils::MakePipelineLayout(device, {bgl});
             pipelineDescriptor.layout = pl;
         }

         pipelineDescriptor.vertex.module = vsModule;
         pipelineDescriptor.cFragment.module = fsModule;
         pipelineDescriptor.cTargets[0].format = mRenderPass.colorFormat;

         mPipeline = device.CreateRenderPipeline(&pipelineDescriptor);
     }

     // Creates a sampler with the given address modes.
     wgpu::Sampler CreateSampler(AddressModeTestCase u,
                                 AddressModeTestCase v,
                                 AddressModeTestCase w) {
         wgpu::Sampler sampler;
         wgpu::SamplerDescriptor descriptor = {};
         descriptor.minFilter = wgpu::FilterMode::Nearest;
         descriptor.magFilter = wgpu::FilterMode::Nearest;
         descriptor.mipmapFilter = wgpu::MipmapFilterMode::Nearest;
         descriptor.addressModeU = u.mMode;
         descriptor.addressModeV = v.mMode;
         descriptor.addressModeW = w.mMode;
         return device.CreateSampler(&descriptor);
     }

     // Creates a bind group that has a sampler with the given address modes and
     // `mTextureView` as the texture to be sampled.
     wgpu::BindGroup CreateBindGroup(AddressModeTestCase u,
                                     AddressModeTestCase v,
                                     AddressModeTestCase w) {
         wgpu::Sampler sampler = CreateSampler(u, v, w);
         return utils::MakeBindGroup(device, mPipeline.GetBindGroupLayout(0),
                                     {{0, sampler}, {1, mTextureView}});
     }

     // Tests drawing with the given address modes and bind group (if non-null).
     // The pipeline must already have been configured. If the bind group is
     // null, creates a bind group that has a sampler with the given address
     // modes. If non-null, the bind group must be compatible with the configured
     // pipeline.
     void TestAddressModes(AddressModeTestCase u,
                           AddressModeTestCase v,
                           AddressModeTestCase w,
                           wgpu::BindGroup bindGroup = nullptr) {
         if (!bindGroup) {
             bindGroup = CreateBindGroup(u, v, w);
         }

         wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
         {
             wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&mRenderPass.renderPassInfo);
             pass.SetPipeline(mPipeline);
             pass.SetBindGroup(0, bindGroup);
             pass.Draw(6);
             pass.End();
         }

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

         utils::RGBA8 expectedU2(u.mExpected2, u.mExpected2, u.mExpected2, 255);
         utils::RGBA8 expectedU3(u.mExpected3, u.mExpected3, u.mExpected3, 255);
         utils::RGBA8 expectedV2(v.mExpected2, v.mExpected2, v.mExpected2, 255);
         utils::RGBA8 expectedV3(v.mExpected3, v.mExpected3, v.mExpected3, 255);
         EXPECT_PIXEL_RGBA8_EQ(utils::RGBA8::kBlack, mRenderPass.color, 0, 0);
         EXPECT_PIXEL_RGBA8_EQ(utils::RGBA8::kWhite, mRenderPass.color, 0, 1);
         EXPECT_PIXEL_RGBA8_EQ(utils::RGBA8::kWhite, mRenderPass.color, 1, 0);
         EXPECT_PIXEL_RGBA8_EQ(utils::RGBA8::kBlack, mRenderPass.color, 1, 1);
         EXPECT_PIXEL_RGBA8_EQ(expectedU2, mRenderPass.color, 2, 0);
         EXPECT_PIXEL_RGBA8_EQ(expectedU3, mRenderPass.color, 3, 0);
         EXPECT_PIXEL_RGBA8_EQ(expectedV2, mRenderPass.color, 0, 2);
         EXPECT_PIXEL_RGBA8_EQ(expectedV3, mRenderPass.color, 0, 3);
     }

     utils::BasicRenderPass mRenderPass;
     wgpu::RenderPipeline mPipeline;
     wgpu::TextureView mTextureView;
 };

 // Test drawing a rect with a checkerboard texture with different address modes.
 TEST_P(SamplerTest, AddressMode) {
     InitShaders(kBasicFS);
     for (auto u : addressModes) {
         for (auto v : addressModes) {
             for (auto w : addressModes) {
                 TestAddressModes(u, v, w);
             }
         }
     }
 }

 // Test that passing texture and sampler objects through user-defined functions works correctly.
 TEST_P(SamplerTest, PassThroughUserFunctionParameters) {
     InitShaders(kPassThroughUserFunctionsFS);
     for (auto u : addressModes) {
         for (auto v : addressModes) {
             for (auto w : addressModes) {
                 TestAddressModes(u, v, w);
             }
         }
     }
 }

 DAWN_INSTANTIATE_TEST(SamplerTest,
                       D3D11Backend(),
                       D3D12Backend(),
                       MetalBackend(),
                       OpenGLBackend(),
                       OpenGLESBackend(),
                       VulkanBackend());

 class StaticSamplerTest : public SamplerTest {
   protected:
     std::vector<wgpu::FeatureName> GetRequiredFeatures() override {
         std::vector<wgpu::FeatureName> requiredFeatures = {};
         if (SupportsFeatures({wgpu::FeatureName::StaticSamplers})) {
             requiredFeatures.push_back(wgpu::FeatureName::StaticSamplers);
         }
         return requiredFeatures;
     }

     void SetUp() override {
         SamplerTest::SetUp();

         DAWN_TEST_UNSUPPORTED_IF(!SupportsFeatures({wgpu::FeatureName::StaticSamplers}));
     }

     // Creates a bind group layout with a static sampler with the given address
     // modes as well as the texture to be sampled.
     wgpu::BindGroupLayout CreateBindGroupLayoutWithStaticSampler(AddressModeTestCase u,
                                                                  AddressModeTestCase v,
                                                                  AddressModeTestCase w) {
         wgpu::Sampler sampler = CreateSampler(u, v, w);
         std::vector<wgpu::BindGroupLayoutEntry> entries;

         wgpu::BindGroupLayoutEntry binding = {};
         binding.binding = 0;
         binding.visibility = wgpu::ShaderStage::Fragment;
         wgpu::StaticSamplerBindingLayout staticSamplerBinding = {};
         staticSamplerBinding.sampler = sampler;
         binding.nextInChain = &staticSamplerBinding;
         entries.push_back(binding);

         wgpu::BindGroupLayoutEntry binding1 = {};
         binding1.binding = 1;
         binding1.visibility = wgpu::ShaderStage::Fragment;
         binding1.texture.sampleType = wgpu::TextureSampleType::Float;
         entries.push_back(binding1);

         wgpu::BindGroupLayoutDescriptor desc = {};
         desc.entryCount = 2;
         desc.entries = entries.data();

         return device.CreateBindGroupLayout(&desc);
     }

     // Creates a bind group from the given layout (which must have a static
     // sampler at binding 0) that contains the texture to be sampled.
     wgpu::BindGroup CreateBindGroupWithStaticSampler(wgpu::BindGroupLayout bgl) {
         return utils::MakeBindGroup(device, bgl, {{1, mTextureView}});
     }
 };

 // Test drawing a rect with a checkerboard texture using a static sampler with different address
 // modes.
 TEST_P(StaticSamplerTest, AddressMode) {
     for (auto u : addressModes) {
         for (auto v : addressModes) {
             for (auto w : addressModes) {
                 // Create the bind group layout with a static sampler for the
                 // given address modes, configure the pipeline with that layout,
                 // and test drawing with a bind group created from that layout.
                 auto bgl = CreateBindGroupLayoutWithStaticSampler(u, v, w);
                 InitShaders(kBasicFS, bgl);
                 TestAddressModes(u, v, w, CreateBindGroupWithStaticSampler(bgl));
             }
         }
     }
 }

 // Test that passing texture and static sampler objects through user-defined functions works
 // correctly.
 TEST_P(StaticSamplerTest, PassThroughUserFunctionParameters) {
     for (auto u : addressModes) {
         for (auto v : addressModes) {
             for (auto w : addressModes) {
                 // Create the bind group layout with a static sampler for the
                 // given address modes, configure the pipeline with that layout,
                 // and test drawing with a bind group created from that layout.
                 auto bgl = CreateBindGroupLayoutWithStaticSampler(u, v, w);
                 InitShaders(kPassThroughUserFunctionsFS, bgl);
                 TestAddressModes(u, v, w, CreateBindGroupWithStaticSampler(bgl));
             }
         }
     }
 }

 DAWN_INSTANTIATE_TEST(StaticSamplerTest,
                       D3D11Backend(),
                       D3D12Backend(),
                       MetalBackend(),
                       OpenGLBackend(),
                       OpenGLESBackend(),
                       VulkanBackend());

 }  // anonymous namespace
 }  // namespace dawn
	// Copyright 2018 The Dawn & Tint Authors
	//
	// Redistribution and use in source and binary forms, with or without
	// modification, are permitted provided that the following conditions are met:
	//
	// 1. Redistributions of source code must retain the above copyright notice, this
	// list of conditions and the following disclaimer.
	//
	// 2. Redistributions in binary form must reproduce the above copyright notice,
	// this list of conditions and the following disclaimer in the documentation
	// and/or other materials provided with the distribution.
	//
	// 3. Neither the name of the copyright holder nor the names of its
	// contributors may be used to endorse or promote products derived from
	// this software without specific prior written permission.
	//
	// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
	// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
	// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
	// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
	// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

	#include <array>
	#include <cmath>
	#include <vector>

	#include "dawn/tests/DawnTest.h"

	#include "dawn/common/Assert.h"
	#include "dawn/common/Constants.h"
	#include "dawn/utils/ComboRenderPipelineDescriptor.h"
	#include "dawn/utils/WGPUHelpers.h"

	namespace dawn {
	namespace {

	constexpr static unsigned int kRTSize = 64;

	const char* kBasicFS = R"(
	@group(0) @binding(0) var sampler0 : sampler;
	@group(0) @binding(1) var texture0 : texture_2d<f32>;

	@fragment
	fn main(@builtin(position) FragCoord : vec4f) -> @location(0) vec4f {
	return textureSample(texture0, sampler0, FragCoord.xy / vec2(2.0, 2.0));
	})";

	const char* kPassThroughUserFunctionsFS = R"(
	@group(0) @binding(0) var sampler0 : sampler;
	@group(0) @binding(1) var texture0 : texture_2d<f32>;

	fn foo(t : texture_2d<f32>, s : sampler, FragCoord : vec4f) -> vec4f {
	return textureSample(t, s, FragCoord.xy / vec2(2.0, 2.0));
	}

	@fragment
	fn main(@builtin(position) FragCoord : vec4f) -> @location(0) vec4f {
	return foo(texture0, sampler0, FragCoord);
	})";

	struct AddressModeTestCase {
	wgpu::AddressMode mMode;
	uint8_t mExpected2;
	uint8_t mExpected3;
	};
	AddressModeTestCase addressModes[] = {
	{
	wgpu::AddressMode::Repeat,
	0,
	255,
	},
	{
	wgpu::AddressMode::MirrorRepeat,
	255,
	0,
	},
	{
	wgpu::AddressMode::ClampToEdge,
	255,
	255,
	},
	};

	class SamplerTest : public DawnTest {
	protected:
	void SetUp() override {
	DawnTest::SetUp();
	mRenderPass = utils::CreateBasicRenderPass(device, kRTSize, kRTSize);

	wgpu::TextureDescriptor descriptor;
	descriptor.dimension = wgpu::TextureDimension::e2D;
	descriptor.size.width = 2;
	descriptor.size.height = 2;
	descriptor.size.depthOrArrayLayers = 1;
	descriptor.sampleCount = 1;
	descriptor.format = wgpu::TextureFormat::RGBA8Unorm;
	descriptor.mipLevelCount = 1;
	descriptor.usage = wgpu::TextureUsage::CopyDst \| wgpu::TextureUsage::TextureBinding;
	wgpu::Texture texture = device.CreateTexture(&descriptor);

	// Create a 2x2 checkerboard texture, with black in the top left and bottom right corners.
	const uint32_t rowPixels = kTextureBytesPerRowAlignment / sizeof(utils::RGBA8);
	std::array<utils::RGBA8, rowPixels * 2> pixels;
	pixels[0] = pixels[rowPixels + 1] = utils::RGBA8::kBlack;
	pixels[1] = pixels[rowPixels] = utils::RGBA8::kWhite;

	wgpu::Buffer stagingBuffer =
	utils::CreateBufferFromData(device, pixels.data(), pixels.size() * sizeof(utils::RGBA8),
	wgpu::BufferUsage::CopySrc);
	wgpu::ImageCopyBuffer imageCopyBuffer = utils::CreateImageCopyBuffer(stagingBuffer, 0, 256);
	wgpu::ImageCopyTexture imageCopyTexture =
	utils::CreateImageCopyTexture(texture, 0, {0, 0, 0});
	wgpu::Extent3D copySize = {2, 2, 1};

	wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
	encoder.CopyBufferToTexture(&imageCopyBuffer, &imageCopyTexture, &copySize);

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

	mTextureView = texture.CreateView();
	}

	// Initializes the pipeline used by tests. Uses `bgl` to set the pipeline
	// layout if it is non-null; otherwise the pipeline is constructed with the
	// default layout.
	void InitShaders(const char* frag_shader, wgpu::BindGroupLayout bgl = nullptr) {
	auto vsModule = utils::CreateShaderModule(device, R"(
	@vertex
	fn main(@builtin(vertex_index) VertexIndex : u32) -> @builtin(position) vec4f {
	var pos = array(
	vec2f(-2.0, -2.0),
	vec2f(-2.0, 2.0),
	vec2f( 2.0, -2.0),
	vec2f(-2.0, 2.0),
	vec2f( 2.0, -2.0),
	vec2f( 2.0, 2.0));
	return vec4f(pos[VertexIndex], 0.0, 1.0);
	}
	)");
	auto fsModule = utils::CreateShaderModule(device, frag_shader);

	utils::ComboRenderPipelineDescriptor pipelineDescriptor;

	if (bgl) {
	wgpu::PipelineLayout pl = utils::MakePipelineLayout(device, {bgl});
	pipelineDescriptor.layout = pl;
	}

	pipelineDescriptor.vertex.module = vsModule;
	pipelineDescriptor.cFragment.module = fsModule;
	pipelineDescriptor.cTargets[0].format = mRenderPass.colorFormat;

	mPipeline = device.CreateRenderPipeline(&pipelineDescriptor);
	}

	// Creates a sampler with the given address modes.
	wgpu::Sampler CreateSampler(AddressModeTestCase u,
	AddressModeTestCase v,
	AddressModeTestCase w) {
	wgpu::Sampler sampler;
	wgpu::SamplerDescriptor descriptor = {};
	descriptor.minFilter = wgpu::FilterMode::Nearest;
	descriptor.magFilter = wgpu::FilterMode::Nearest;
	descriptor.mipmapFilter = wgpu::MipmapFilterMode::Nearest;
	descriptor.addressModeU = u.mMode;
	descriptor.addressModeV = v.mMode;
	descriptor.addressModeW = w.mMode;
	return device.CreateSampler(&descriptor);
	}

	// Creates a bind group that has a sampler with the given address modes and
	// `mTextureView` as the texture to be sampled.
	wgpu::BindGroup CreateBindGroup(AddressModeTestCase u,
	AddressModeTestCase v,
	AddressModeTestCase w) {
	wgpu::Sampler sampler = CreateSampler(u, v, w);
	return utils::MakeBindGroup(device, mPipeline.GetBindGroupLayout(0),
	{{0, sampler}, {1, mTextureView}});
	}

	// Tests drawing with the given address modes and bind group (if non-null).
	// The pipeline must already have been configured. If the bind group is
	// null, creates a bind group that has a sampler with the given address
	// modes. If non-null, the bind group must be compatible with the configured
	// pipeline.
	void TestAddressModes(AddressModeTestCase u,
	AddressModeTestCase v,
	AddressModeTestCase w,
	wgpu::BindGroup bindGroup = nullptr) {
	if (!bindGroup) {
	bindGroup = CreateBindGroup(u, v, w);
	}

	wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
	{
	wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&mRenderPass.renderPassInfo);
	pass.SetPipeline(mPipeline);
	pass.SetBindGroup(0, bindGroup);
	pass.Draw(6);
	pass.End();
	}

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

	utils::RGBA8 expectedU2(u.mExpected2, u.mExpected2, u.mExpected2, 255);
	utils::RGBA8 expectedU3(u.mExpected3, u.mExpected3, u.mExpected3, 255);
	utils::RGBA8 expectedV2(v.mExpected2, v.mExpected2, v.mExpected2, 255);
	utils::RGBA8 expectedV3(v.mExpected3, v.mExpected3, v.mExpected3, 255);
	EXPECT_PIXEL_RGBA8_EQ(utils::RGBA8::kBlack, mRenderPass.color, 0, 0);
	EXPECT_PIXEL_RGBA8_EQ(utils::RGBA8::kWhite, mRenderPass.color, 0, 1);
	EXPECT_PIXEL_RGBA8_EQ(utils::RGBA8::kWhite, mRenderPass.color, 1, 0);
	EXPECT_PIXEL_RGBA8_EQ(utils::RGBA8::kBlack, mRenderPass.color, 1, 1);
	EXPECT_PIXEL_RGBA8_EQ(expectedU2, mRenderPass.color, 2, 0);
	EXPECT_PIXEL_RGBA8_EQ(expectedU3, mRenderPass.color, 3, 0);
	EXPECT_PIXEL_RGBA8_EQ(expectedV2, mRenderPass.color, 0, 2);
	EXPECT_PIXEL_RGBA8_EQ(expectedV3, mRenderPass.color, 0, 3);
	}

	utils::BasicRenderPass mRenderPass;
	wgpu::RenderPipeline mPipeline;
	wgpu::TextureView mTextureView;
	};

	// Test drawing a rect with a checkerboard texture with different address modes.
	TEST_P(SamplerTest, AddressMode) {
	InitShaders(kBasicFS);
	for (auto u : addressModes) {
	for (auto v : addressModes) {
	for (auto w : addressModes) {
	TestAddressModes(u, v, w);
	}
	}
	}
	}

	// Test that passing texture and sampler objects through user-defined functions works correctly.
	TEST_P(SamplerTest, PassThroughUserFunctionParameters) {
	InitShaders(kPassThroughUserFunctionsFS);
	for (auto u : addressModes) {
	for (auto v : addressModes) {
	for (auto w : addressModes) {
	TestAddressModes(u, v, w);
	}
	}
	}
	}

	DAWN_INSTANTIATE_TEST(SamplerTest,
	D3D11Backend(),
	D3D12Backend(),
	MetalBackend(),
	OpenGLBackend(),
	OpenGLESBackend(),
	VulkanBackend());

	class StaticSamplerTest : public SamplerTest {
	protected:
	std::vector<wgpu::FeatureName> GetRequiredFeatures() override {
	std::vector<wgpu::FeatureName> requiredFeatures = {};
	if (SupportsFeatures({wgpu::FeatureName::StaticSamplers})) {
	requiredFeatures.push_back(wgpu::FeatureName::StaticSamplers);
	}
	return requiredFeatures;
	}

	void SetUp() override {
	SamplerTest::SetUp();

	DAWN_TEST_UNSUPPORTED_IF(!SupportsFeatures({wgpu::FeatureName::StaticSamplers}));
	}

	// Creates a bind group layout with a static sampler with the given address
	// modes as well as the texture to be sampled.
	wgpu::BindGroupLayout CreateBindGroupLayoutWithStaticSampler(AddressModeTestCase u,
	AddressModeTestCase v,
	AddressModeTestCase w) {
	wgpu::Sampler sampler = CreateSampler(u, v, w);
	std::vector<wgpu::BindGroupLayoutEntry> entries;

	wgpu::BindGroupLayoutEntry binding = {};
	binding.binding = 0;
	binding.visibility = wgpu::ShaderStage::Fragment;
	wgpu::StaticSamplerBindingLayout staticSamplerBinding = {};
	staticSamplerBinding.sampler = sampler;
	binding.nextInChain = &staticSamplerBinding;
	entries.push_back(binding);

	wgpu::BindGroupLayoutEntry binding1 = {};
	binding1.binding = 1;
	binding1.visibility = wgpu::ShaderStage::Fragment;
	binding1.texture.sampleType = wgpu::TextureSampleType::Float;
	entries.push_back(binding1);

	wgpu::BindGroupLayoutDescriptor desc = {};
	desc.entryCount = 2;
	desc.entries = entries.data();

	return device.CreateBindGroupLayout(&desc);
	}

	// Creates a bind group from the given layout (which must have a static
	// sampler at binding 0) that contains the texture to be sampled.
	wgpu::BindGroup CreateBindGroupWithStaticSampler(wgpu::BindGroupLayout bgl) {
	return utils::MakeBindGroup(device, bgl, {{1, mTextureView}});
	}
	};

	// Test drawing a rect with a checkerboard texture using a static sampler with different address
	// modes.
	TEST_P(StaticSamplerTest, AddressMode) {
	for (auto u : addressModes) {
	for (auto v : addressModes) {
	for (auto w : addressModes) {
	// Create the bind group layout with a static sampler for the
	// given address modes, configure the pipeline with that layout,
	// and test drawing with a bind group created from that layout.
	auto bgl = CreateBindGroupLayoutWithStaticSampler(u, v, w);
	InitShaders(kBasicFS, bgl);
	TestAddressModes(u, v, w, CreateBindGroupWithStaticSampler(bgl));
	}
	}
	}
	}

	// Test that passing texture and static sampler objects through user-defined functions works
	// correctly.
	TEST_P(StaticSamplerTest, PassThroughUserFunctionParameters) {
	for (auto u : addressModes) {
	for (auto v : addressModes) {
	for (auto w : addressModes) {
	// Create the bind group layout with a static sampler for the
	// given address modes, configure the pipeline with that layout,
	// and test drawing with a bind group created from that layout.
	auto bgl = CreateBindGroupLayoutWithStaticSampler(u, v, w);
	InitShaders(kPassThroughUserFunctionsFS, bgl);
	TestAddressModes(u, v, w, CreateBindGroupWithStaticSampler(bgl));
	}
	}
	}
	}

	DAWN_INSTANTIATE_TEST(StaticSamplerTest,
	D3D11Backend(),
	D3D12Backend(),
	MetalBackend(),
	OpenGLBackend(),
	OpenGLESBackend(),
	VulkanBackend());

	} // anonymous namespace
	} // namespace dawn