src/dawn/tests/end2end/FragDepthTests.cpp - dawn.git - Git at Google


            
            // Copyright 2022 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 "src/dawn/tests/DawnTest.h"

            
            #include "src/dawn/utils/ComboRenderPipelineDescriptor.h"

            
            #include "src/dawn/utils/WGPUHelpers.h"


            namespace dawn {

            
            namespace {


            constexpr wgpu::TextureFormat kDepthFormat = wgpu::TextureFormat::Depth32Float;


            class FragDepthTests : public DawnTest {

            
              protected:

            
                void SetUp() override {

            
                    DawnTest::SetUp();


                    // TODO(crbug.com/473870505): [Capture] support depth/stencil and multi-planar textures.

            
                    DAWN_SUPPRESS_TEST_IF(IsCaptureReplayCheckingEnabled());

            
                }

            
            };


            // Test that when writing to FragDepth the result is clamped to the viewport.

            
            TEST_P(FragDepthTests, FragDepthIsClampedToViewport) {

            
                wgpu::ShaderModule module = utils::CreateShaderModule(device, R"(

            
                    @vertex fn vs() -> @builtin(position) vec4f {

            
                        return vec4f(0.0, 0.0, 0.5, 1.0);

            
                    }


                    @fragment fn fs() -> @builtin(frag_depth) f32 {

            
                        return 1.0;

            
                    }

            
                )");


                // Create the pipeline that uses frag_depth to output the depth.

            
                utils::ComboRenderPipelineDescriptor pDesc;

            
                pDesc.vertex.module = module;

            
                pDesc.primitive.topology = wgpu::PrimitiveTopology::PointList;

            
                pDesc.cFragment.module = module;

            
                pDesc.cFragment.targetCount = 0;


                wgpu::DepthStencilState* pDescDS = pDesc.EnableDepthStencil(kDepthFormat);

            
                pDescDS->depthWriteEnabled = wgpu::OptionalBool::True;

            
                pDescDS->depthCompare = wgpu::CompareFunction::Always;

            
                wgpu::RenderPipeline pipeline = device.CreateRenderPipeline(&pDesc);


                // Create a depth-only render pass.

            
                wgpu::TextureDescriptor depthDesc;

            
                depthDesc.size = {1, 1};

            
                depthDesc.usage = wgpu::TextureUsage::RenderAttachment | wgpu::TextureUsage::CopySrc;

            
                depthDesc.format = kDepthFormat;

            
                wgpu::Texture depthTexture = device.CreateTexture(&depthDesc);


                utils::ComboRenderPassDescriptor renderPassDesc({}, depthTexture.CreateView());

            
                renderPassDesc.cDepthStencilAttachmentInfo.stencilLoadOp = wgpu::LoadOp::Undefined;

            
                renderPassDesc.cDepthStencilAttachmentInfo.stencilStoreOp = wgpu::StoreOp::Undefined;


                // Draw a point with a skewed viewport, so 1.0 depth gets clamped to 0.5.

            
                wgpu::CommandEncoder encoder = device.CreateCommandEncoder();

            
                wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPassDesc);

            
                pass.SetViewport(0, 0, 1, 1, 0.0, 0.5);

            
                pass.SetPipeline(pipeline);

            
                pass.Draw(1);

            
                pass.End();


                wgpu::CommandBuffer commands = encoder.Finish();

            
                queue.Submit(1, &commands);


                EXPECT_PIXEL_FLOAT_EQ(0.5f, depthTexture, 0, 0);

            
            }


            // Test for the immediate data logic for ClampFragDepth in Vulkan to check that changing the

            
            // pipeline layout doesn't invalidate the immediate data that were set.

            
            TEST_P(FragDepthTests, ChangingPipelineLayoutDoesntInvalidateViewport) {

            
                // TODO(dawn:1805): Load ByteAddressBuffer in Pixel Shader doesn't work with NVIDIA on D3D11

            
                DAWN_SUPPRESS_TEST_IF(IsD3D11() && IsNvidia());


                wgpu::ShaderModule module = utils::CreateShaderModule(device, R"(

            
                    @vertex fn vs() -> @builtin(position) vec4f {

            
                        return vec4f(0.0, 0.0, 0.5, 1.0);

            
                    }


                    @group(0) @binding(0) var<uniform> uniformDepth1 : f32;

            
                    @fragment fn fsUniform1() -> @builtin(frag_depth) f32 {

            
                        return uniformDepth1;

            
                    }


                    @group(0) @binding(0) var tex : texture_2d<f32>;

            
                    @fragment fn fsUniform2() -> @builtin(frag_depth) f32 {

            
                        return textureLoad(tex, vec2u(0), 0).r;

            
                    }

            
                )");


                // Create the pipeline and bindgroup for the pipeline layout with a uniform buffer.

            
                utils::ComboRenderPipelineDescriptor upDesc;

            
                upDesc.vertex.module = module;

            
                upDesc.primitive.topology = wgpu::PrimitiveTopology::PointList;

            
                upDesc.cFragment.module = module;

            
                upDesc.cFragment.entryPoint = "fsUniform1";

            
                upDesc.cFragment.targetCount = 0;


                wgpu::DepthStencilState* upDescDS = upDesc.EnableDepthStencil(kDepthFormat);

            
                upDescDS->depthWriteEnabled = wgpu::OptionalBool::True;

            
                upDescDS->depthCompare = wgpu::CompareFunction::Always;

            
                wgpu::RenderPipeline uniformPipeline = device.CreateRenderPipeline(&upDesc);


                wgpu::Buffer uniformBuffer =

            
                    utils::CreateBufferFromData<float>(device, wgpu::BufferUsage::Uniform, {0.0});

            
                wgpu::BindGroup uniformBG =

            
                    utils::MakeBindGroup(device, uniformPipeline.GetBindGroupLayout(0), {{0, uniformBuffer}});


                // Create the pipeline and bindgroup for the pipeline layout with a uniform buffer.

            
                utils::ComboRenderPipelineDescriptor spDesc;

            
                spDesc.vertex.module = module;

            
                spDesc.primitive.topology = wgpu::PrimitiveTopology::PointList;

            
                spDesc.cFragment.module = module;

            
                spDesc.cFragment.entryPoint = "fsUniform2";

            
                spDesc.cFragment.targetCount = 0;


                wgpu::DepthStencilState* spDescDS = spDesc.EnableDepthStencil(kDepthFormat);

            
                spDescDS->depthWriteEnabled = wgpu::OptionalBool::True;

            
                spDescDS->depthCompare = wgpu::CompareFunction::Always;

            
                wgpu::RenderPipeline texturePipeline = device.CreateRenderPipeline(&spDesc);


                wgpu::TextureDescriptor texDesc = {};

            
                texDesc.size = {1, 1, 1};

            
                texDesc.format = wgpu::TextureFormat::R32Float;

            
                texDesc.usage = wgpu::TextureUsage::TextureBinding | wgpu::TextureUsage::CopyDst;

            
                wgpu::Texture texture = device.CreateTexture(&texDesc);


                wgpu::TexelCopyTextureInfo texelCopyTextureInfo =

            
                    utils::CreateTexelCopyTextureInfo(texture, 0, {0, 0, 0});

            
                wgpu::TexelCopyBufferLayout texelCopyBufferLayout =

            
                    utils::CreateTexelCopyBufferLayout(0, sizeof(float));

            
                wgpu::Extent3D copyExtent = {1, 1, 1};


                float one = 1.0;

            
                queue.WriteTexture(&texelCopyTextureInfo, &one, sizeof(float), &texelCopyBufferLayout,

            
                                   &copyExtent);


                wgpu::BindGroup textureBG = utils::MakeBindGroup(device, texturePipeline.GetBindGroupLayout(0),

            
                                                                 {{0, texture.CreateView()}});


                // Create a depth-only render pass.

            
                wgpu::TextureDescriptor depthDesc;

            
                depthDesc.size = {1, 1};

            
                depthDesc.usage = wgpu::TextureUsage::RenderAttachment | wgpu::TextureUsage::CopySrc;

            
                depthDesc.format = kDepthFormat;

            
                wgpu::Texture depthTexture = device.CreateTexture(&depthDesc);


                utils::ComboRenderPassDescriptor renderPassDesc({}, depthTexture.CreateView());

            
                renderPassDesc.cDepthStencilAttachmentInfo.stencilLoadOp = wgpu::LoadOp::Undefined;

            
                renderPassDesc.cDepthStencilAttachmentInfo.stencilStoreOp = wgpu::StoreOp::Undefined;


                // Draw two point with a different pipeline layout to check Vulkan's behavior.

            
                wgpu::CommandEncoder encoder = device.CreateCommandEncoder();

            
                wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPassDesc);

            
                pass.SetViewport(0, 0, 1, 1, 0.0, 0.5);


                // Writes 0.0.

            
                pass.SetPipeline(uniformPipeline);

            
                pass.SetBindGroup(0, uniformBG);

            
                pass.Draw(1);


                // Writes 1.0 clamped to 0.5.

            
                pass.SetPipeline(texturePipeline);

            
                pass.SetBindGroup(0, textureBG);

            
                pass.Draw(1);


                pass.End();

            
                wgpu::CommandBuffer commands = encoder.Finish();

            
                queue.Submit(1, &commands);


                EXPECT_PIXEL_FLOAT_EQ(0.5f, depthTexture, 0, 0);

            
            }


            // Check that if the fragment is outside of the viewport during rasterization, it is clipped

            
            // even if it output @builtin(frag_depth).

            
            TEST_P(FragDepthTests, RasterizationClipBeforeFS) {

            
                // TODO(dawn:1616): Metal too needs to clamping of @builtin(frag_depth) to the viewport.

            
                DAWN_SUPPRESS_TEST_IF(IsMetal());


                wgpu::ShaderModule module = utils::CreateShaderModule(device, R"(

            
                    @vertex fn vs() -> @builtin(position) vec4f {

            
                        return vec4f(0.0, 0.0, 5.0, 1.0);

            
                    }


                    @fragment fn fs() -> @builtin(frag_depth) f32 {

            
                        return 0.5;

            
                    }

            
                )");


                // Create the pipeline and bindgroup for the pipeline layout with a uniform buffer.

            
                utils::ComboRenderPipelineDescriptor pDesc;

            
                pDesc.vertex.module = module;

            
                pDesc.primitive.topology = wgpu::PrimitiveTopology::PointList;

            
                pDesc.cFragment.module = module;

            
                pDesc.cFragment.targetCount = 0;


                wgpu::DepthStencilState* pDescDS = pDesc.EnableDepthStencil(kDepthFormat);

            
                pDescDS->depthWriteEnabled = wgpu::OptionalBool::True;

            
                pDescDS->depthCompare = wgpu::CompareFunction::Always;

            
                wgpu::RenderPipeline uniformPipeline = device.CreateRenderPipeline(&pDesc);


                // Create a depth-only render pass.

            
                wgpu::TextureDescriptor depthDesc;

            
                depthDesc.size = {1, 1};

            
                depthDesc.usage = wgpu::TextureUsage::RenderAttachment | wgpu::TextureUsage::CopySrc;

            
                depthDesc.format = kDepthFormat;

            
                wgpu::Texture depthTexture = device.CreateTexture(&depthDesc);


                utils::ComboRenderPassDescriptor renderPassDesc({}, depthTexture.CreateView());

            
                renderPassDesc.cDepthStencilAttachmentInfo.depthClearValue = 0.0f;

            
                renderPassDesc.cDepthStencilAttachmentInfo.stencilLoadOp = wgpu::LoadOp::Undefined;

            
                renderPassDesc.cDepthStencilAttachmentInfo.stencilStoreOp = wgpu::StoreOp::Undefined;


                // Draw a point with a depth outside of the viewport. It should get discarded.

            
                wgpu::CommandEncoder encoder = device.CreateCommandEncoder();

            
                wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPassDesc);

            
                pass.SetPipeline(uniformPipeline);

            
                pass.Draw(1);

            
                pass.End();


                wgpu::CommandBuffer commands = encoder.Finish();

            
                queue.Submit(1, &commands);


                // The fragment should be discarded so the depth stayed 0.0, the depthClearValue.

            
                EXPECT_PIXEL_FLOAT_EQ(0.0f, depthTexture, 0, 0);

            
            }


            DAWN_INSTANTIATE_TEST(FragDepthTests,

            
                                  D3D11Backend(),

            
                                  D3D12Backend(),

            
                                  MetalBackend(),

            
                                  OpenGLBackend(),

            
                                  OpenGLESBackend(),

            
                                  VulkanBackend(),

            
                                  WebGPUBackend());


            }  // anonymous namespace

            
            }  // namespace dawn
	// Copyright 2022 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 "src/dawn/tests/DawnTest.h"
	#include "src/dawn/utils/ComboRenderPipelineDescriptor.h"
	#include "src/dawn/utils/WGPUHelpers.h"

	namespace dawn {
	namespace {

	constexpr wgpu::TextureFormat kDepthFormat = wgpu::TextureFormat::Depth32Float;

	class FragDepthTests : public DawnTest {
	protected:
	void SetUp() override {
	DawnTest::SetUp();

	// TODO(crbug.com/473870505): [Capture] support depth/stencil and multi-planar textures.
	DAWN_SUPPRESS_TEST_IF(IsCaptureReplayCheckingEnabled());
	}
	};

	// Test that when writing to FragDepth the result is clamped to the viewport.
	TEST_P(FragDepthTests, FragDepthIsClampedToViewport) {
	wgpu::ShaderModule module = utils::CreateShaderModule(device, R"(
	@vertex fn vs() -> @builtin(position) vec4f {
	return vec4f(0.0, 0.0, 0.5, 1.0);
	}

	@fragment fn fs() -> @builtin(frag_depth) f32 {
	return 1.0;
	}
	)");

	// Create the pipeline that uses frag_depth to output the depth.
	utils::ComboRenderPipelineDescriptor pDesc;
	pDesc.vertex.module = module;
	pDesc.primitive.topology = wgpu::PrimitiveTopology::PointList;
	pDesc.cFragment.module = module;
	pDesc.cFragment.targetCount = 0;

	wgpu::DepthStencilState* pDescDS = pDesc.EnableDepthStencil(kDepthFormat);
	pDescDS->depthWriteEnabled = wgpu::OptionalBool::True;
	pDescDS->depthCompare = wgpu::CompareFunction::Always;
	wgpu::RenderPipeline pipeline = device.CreateRenderPipeline(&pDesc);

	// Create a depth-only render pass.
	wgpu::TextureDescriptor depthDesc;
	depthDesc.size = {1, 1};
	depthDesc.usage = wgpu::TextureUsage::RenderAttachment \| wgpu::TextureUsage::CopySrc;
	depthDesc.format = kDepthFormat;
	wgpu::Texture depthTexture = device.CreateTexture(&depthDesc);

	utils::ComboRenderPassDescriptor renderPassDesc({}, depthTexture.CreateView());
	renderPassDesc.cDepthStencilAttachmentInfo.stencilLoadOp = wgpu::LoadOp::Undefined;
	renderPassDesc.cDepthStencilAttachmentInfo.stencilStoreOp = wgpu::StoreOp::Undefined;

	// Draw a point with a skewed viewport, so 1.0 depth gets clamped to 0.5.
	wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
	wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPassDesc);
	pass.SetViewport(0, 0, 1, 1, 0.0, 0.5);
	pass.SetPipeline(pipeline);
	pass.Draw(1);
	pass.End();

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

	EXPECT_PIXEL_FLOAT_EQ(0.5f, depthTexture, 0, 0);
	}

	// Test for the immediate data logic for ClampFragDepth in Vulkan to check that changing the
	// pipeline layout doesn't invalidate the immediate data that were set.
	TEST_P(FragDepthTests, ChangingPipelineLayoutDoesntInvalidateViewport) {
	// TODO(dawn:1805): Load ByteAddressBuffer in Pixel Shader doesn't work with NVIDIA on D3D11
	DAWN_SUPPRESS_TEST_IF(IsD3D11() && IsNvidia());

	wgpu::ShaderModule module = utils::CreateShaderModule(device, R"(
	@vertex fn vs() -> @builtin(position) vec4f {
	return vec4f(0.0, 0.0, 0.5, 1.0);
	}

	@group(0) @binding(0) var<uniform> uniformDepth1 : f32;
	@fragment fn fsUniform1() -> @builtin(frag_depth) f32 {
	return uniformDepth1;
	}

	@group(0) @binding(0) var tex : texture_2d<f32>;
	@fragment fn fsUniform2() -> @builtin(frag_depth) f32 {
	return textureLoad(tex, vec2u(0), 0).r;
	}
	)");

	// Create the pipeline and bindgroup for the pipeline layout with a uniform buffer.
	utils::ComboRenderPipelineDescriptor upDesc;
	upDesc.vertex.module = module;
	upDesc.primitive.topology = wgpu::PrimitiveTopology::PointList;
	upDesc.cFragment.module = module;
	upDesc.cFragment.entryPoint = "fsUniform1";
	upDesc.cFragment.targetCount = 0;

	wgpu::DepthStencilState* upDescDS = upDesc.EnableDepthStencil(kDepthFormat);
	upDescDS->depthWriteEnabled = wgpu::OptionalBool::True;
	upDescDS->depthCompare = wgpu::CompareFunction::Always;
	wgpu::RenderPipeline uniformPipeline = device.CreateRenderPipeline(&upDesc);

	wgpu::Buffer uniformBuffer =
	utils::CreateBufferFromData<float>(device, wgpu::BufferUsage::Uniform, {0.0});
	wgpu::BindGroup uniformBG =
	utils::MakeBindGroup(device, uniformPipeline.GetBindGroupLayout(0), {{0, uniformBuffer}});

	// Create the pipeline and bindgroup for the pipeline layout with a uniform buffer.
	utils::ComboRenderPipelineDescriptor spDesc;
	spDesc.vertex.module = module;
	spDesc.primitive.topology = wgpu::PrimitiveTopology::PointList;
	spDesc.cFragment.module = module;
	spDesc.cFragment.entryPoint = "fsUniform2";
	spDesc.cFragment.targetCount = 0;

	wgpu::DepthStencilState* spDescDS = spDesc.EnableDepthStencil(kDepthFormat);
	spDescDS->depthWriteEnabled = wgpu::OptionalBool::True;
	spDescDS->depthCompare = wgpu::CompareFunction::Always;
	wgpu::RenderPipeline texturePipeline = device.CreateRenderPipeline(&spDesc);

	wgpu::TextureDescriptor texDesc = {};
	texDesc.size = {1, 1, 1};
	texDesc.format = wgpu::TextureFormat::R32Float;
	texDesc.usage = wgpu::TextureUsage::TextureBinding \| wgpu::TextureUsage::CopyDst;
	wgpu::Texture texture = device.CreateTexture(&texDesc);

	wgpu::TexelCopyTextureInfo texelCopyTextureInfo =
	utils::CreateTexelCopyTextureInfo(texture, 0, {0, 0, 0});
	wgpu::TexelCopyBufferLayout texelCopyBufferLayout =
	utils::CreateTexelCopyBufferLayout(0, sizeof(float));
	wgpu::Extent3D copyExtent = {1, 1, 1};

	float one = 1.0;
	queue.WriteTexture(&texelCopyTextureInfo, &one, sizeof(float), &texelCopyBufferLayout,
	&copyExtent);

	wgpu::BindGroup textureBG = utils::MakeBindGroup(device, texturePipeline.GetBindGroupLayout(0),
	{{0, texture.CreateView()}});

	// Create a depth-only render pass.
	wgpu::TextureDescriptor depthDesc;
	depthDesc.size = {1, 1};
	depthDesc.usage = wgpu::TextureUsage::RenderAttachment \| wgpu::TextureUsage::CopySrc;
	depthDesc.format = kDepthFormat;
	wgpu::Texture depthTexture = device.CreateTexture(&depthDesc);

	utils::ComboRenderPassDescriptor renderPassDesc({}, depthTexture.CreateView());
	renderPassDesc.cDepthStencilAttachmentInfo.stencilLoadOp = wgpu::LoadOp::Undefined;
	renderPassDesc.cDepthStencilAttachmentInfo.stencilStoreOp = wgpu::StoreOp::Undefined;

	// Draw two point with a different pipeline layout to check Vulkan's behavior.
	wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
	wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPassDesc);
	pass.SetViewport(0, 0, 1, 1, 0.0, 0.5);

	// Writes 0.0.
	pass.SetPipeline(uniformPipeline);
	pass.SetBindGroup(0, uniformBG);
	pass.Draw(1);

	// Writes 1.0 clamped to 0.5.
	pass.SetPipeline(texturePipeline);
	pass.SetBindGroup(0, textureBG);
	pass.Draw(1);

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

	EXPECT_PIXEL_FLOAT_EQ(0.5f, depthTexture, 0, 0);
	}

	// Check that if the fragment is outside of the viewport during rasterization, it is clipped
	// even if it output @builtin(frag_depth).
	TEST_P(FragDepthTests, RasterizationClipBeforeFS) {
	// TODO(dawn:1616): Metal too needs to clamping of @builtin(frag_depth) to the viewport.
	DAWN_SUPPRESS_TEST_IF(IsMetal());

	wgpu::ShaderModule module = utils::CreateShaderModule(device, R"(
	@vertex fn vs() -> @builtin(position) vec4f {
	return vec4f(0.0, 0.0, 5.0, 1.0);
	}

	@fragment fn fs() -> @builtin(frag_depth) f32 {
	return 0.5;
	}
	)");

	// Create the pipeline and bindgroup for the pipeline layout with a uniform buffer.
	utils::ComboRenderPipelineDescriptor pDesc;
	pDesc.vertex.module = module;
	pDesc.primitive.topology = wgpu::PrimitiveTopology::PointList;
	pDesc.cFragment.module = module;
	pDesc.cFragment.targetCount = 0;

	wgpu::DepthStencilState* pDescDS = pDesc.EnableDepthStencil(kDepthFormat);
	pDescDS->depthWriteEnabled = wgpu::OptionalBool::True;
	pDescDS->depthCompare = wgpu::CompareFunction::Always;
	wgpu::RenderPipeline uniformPipeline = device.CreateRenderPipeline(&pDesc);

	// Create a depth-only render pass.
	wgpu::TextureDescriptor depthDesc;
	depthDesc.size = {1, 1};
	depthDesc.usage = wgpu::TextureUsage::RenderAttachment \| wgpu::TextureUsage::CopySrc;
	depthDesc.format = kDepthFormat;
	wgpu::Texture depthTexture = device.CreateTexture(&depthDesc);

	utils::ComboRenderPassDescriptor renderPassDesc({}, depthTexture.CreateView());
	renderPassDesc.cDepthStencilAttachmentInfo.depthClearValue = 0.0f;
	renderPassDesc.cDepthStencilAttachmentInfo.stencilLoadOp = wgpu::LoadOp::Undefined;
	renderPassDesc.cDepthStencilAttachmentInfo.stencilStoreOp = wgpu::StoreOp::Undefined;

	// Draw a point with a depth outside of the viewport. It should get discarded.
	wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
	wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPassDesc);
	pass.SetPipeline(uniformPipeline);
	pass.Draw(1);
	pass.End();

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

	// The fragment should be discarded so the depth stayed 0.0, the depthClearValue.
	EXPECT_PIXEL_FLOAT_EQ(0.0f, depthTexture, 0, 0);
	}

	DAWN_INSTANTIATE_TEST(FragDepthTests,
	D3D11Backend(),
	D3D12Backend(),
	MetalBackend(),
	OpenGLBackend(),
	OpenGLESBackend(),
	VulkanBackend(),
	WebGPUBackend());

	} // anonymous namespace
	} // namespace dawn