src/dawn/tests/end2end/FragDepthTests.cpp - dawn - 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 "dawn/tests/DawnTest.h"
 #include "dawn/utils/ComboRenderPipelineDescriptor.h"
 #include "dawn/utils/WGPUHelpers.h"

 namespace dawn {
 namespace {

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

 class FragDepthTests : public DawnTest {};

 // Test that when writing to FragDepth the result is clamped to the viewport.
 TEST_P(FragDepthTests, FragDepthIsClampedToViewport) {
     // TODO(dawn:1125): Add the shader transform to clamp the frag depth to the GL backend.
     DAWN_SUPPRESS_TEST_IF(IsOpenGL() || IsOpenGLES());

     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.vertex.entryPoint = "vs";
     pDesc.primitive.topology = wgpu::PrimitiveTopology::PointList;
     pDesc.cFragment.module = module;
     pDesc.cFragment.entryPoint = "fs";
     pDesc.cFragment.targetCount = 0;

     wgpu::DepthStencilState* pDescDS = pDesc.EnableDepthStencil(kDepthFormat);
     pDescDS->depthWriteEnabled = 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 push constant logic for ClampFragDepth in Vulkan to check that changing the
 // pipeline layout doesn't invalidate the push constants that were set.
 TEST_P(FragDepthTests, ChangingPipelineLayoutDoesntInvalidateViewport) {
     // TODO(dawn:1125): Add the shader transform to clamp the frag depth to the GL backend.
     DAWN_SUPPRESS_TEST_IF(IsOpenGL() || IsOpenGLES());

     // 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> uniformDepth : f32;
         @fragment fn fsUniform() -> @builtin(frag_depth) f32 {
             return uniformDepth;
         }

         @group(0) @binding(0) var<storage, read> storageDepth : f32;
         @fragment fn fsStorage() -> @builtin(frag_depth) f32 {
             return storageDepth;
         }
     )");

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

     wgpu::DepthStencilState* upDescDS = upDesc.EnableDepthStencil(kDepthFormat);
     upDescDS->depthWriteEnabled = 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.vertex.entryPoint = "vs";
     spDesc.primitive.topology = wgpu::PrimitiveTopology::PointList;
     spDesc.cFragment.module = module;
     spDesc.cFragment.entryPoint = "fsStorage";
     spDesc.cFragment.targetCount = 0;

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

     wgpu::Buffer storageBuffer =
         utils::CreateBufferFromData<float>(device, wgpu::BufferUsage::Storage, {1.0});
     wgpu::BindGroup storageBG =
         utils::MakeBindGroup(device, storagePipeline.GetBindGroupLayout(0), {{0, storageBuffer}});

     // 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(storagePipeline);
     pass.SetBindGroup(0, storageBG);
     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.vertex.entryPoint = "vs";
     pDesc.primitive.topology = wgpu::PrimitiveTopology::PointList;
     pDesc.cFragment.module = module;
     pDesc.cFragment.entryPoint = "fs";
     pDesc.cFragment.targetCount = 0;

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

 }  // 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 "dawn/tests/DawnTest.h"
	#include "dawn/utils/ComboRenderPipelineDescriptor.h"
	#include "dawn/utils/WGPUHelpers.h"

	namespace dawn {
	namespace {

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

	class FragDepthTests : public DawnTest {};

	// Test that when writing to FragDepth the result is clamped to the viewport.
	TEST_P(FragDepthTests, FragDepthIsClampedToViewport) {
	// TODO(dawn:1125): Add the shader transform to clamp the frag depth to the GL backend.
	DAWN_SUPPRESS_TEST_IF(IsOpenGL() \|\| IsOpenGLES());

	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.vertex.entryPoint = "vs";
	pDesc.primitive.topology = wgpu::PrimitiveTopology::PointList;
	pDesc.cFragment.module = module;
	pDesc.cFragment.entryPoint = "fs";
	pDesc.cFragment.targetCount = 0;

	wgpu::DepthStencilState* pDescDS = pDesc.EnableDepthStencil(kDepthFormat);
	pDescDS->depthWriteEnabled = 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 push constant logic for ClampFragDepth in Vulkan to check that changing the
	// pipeline layout doesn't invalidate the push constants that were set.
	TEST_P(FragDepthTests, ChangingPipelineLayoutDoesntInvalidateViewport) {
	// TODO(dawn:1125): Add the shader transform to clamp the frag depth to the GL backend.
	DAWN_SUPPRESS_TEST_IF(IsOpenGL() \|\| IsOpenGLES());

	// 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> uniformDepth : f32;
	@fragment fn fsUniform() -> @builtin(frag_depth) f32 {
	return uniformDepth;
	}

	@group(0) @binding(0) var<storage, read> storageDepth : f32;
	@fragment fn fsStorage() -> @builtin(frag_depth) f32 {
	return storageDepth;
	}
	)");

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

	wgpu::DepthStencilState* upDescDS = upDesc.EnableDepthStencil(kDepthFormat);
	upDescDS->depthWriteEnabled = 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.vertex.entryPoint = "vs";
	spDesc.primitive.topology = wgpu::PrimitiveTopology::PointList;
	spDesc.cFragment.module = module;
	spDesc.cFragment.entryPoint = "fsStorage";
	spDesc.cFragment.targetCount = 0;

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

	wgpu::Buffer storageBuffer =
	utils::CreateBufferFromData<float>(device, wgpu::BufferUsage::Storage, {1.0});
	wgpu::BindGroup storageBG =
	utils::MakeBindGroup(device, storagePipeline.GetBindGroupLayout(0), {{0, storageBuffer}});

	// 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(storagePipeline);
	pass.SetBindGroup(0, storageBG);
	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.vertex.entryPoint = "vs";
	pDesc.primitive.topology = wgpu::PrimitiveTopology::PointList;
	pDesc.cFragment.module = module;
	pDesc.cFragment.entryPoint = "fs";
	pDesc.cFragment.targetCount = 0;

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

	} // anonymous namespace
	} // namespace dawn