src/dawn/tests/end2end/Texture3DTests.cpp - dawn - Git at Google

 // Copyright 2021 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 <algorithm>
 #include <vector>

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

 namespace dawn {
 namespace {

 constexpr static uint32_t kRTSize = 4;
 constexpr wgpu::TextureFormat kFormat = wgpu::TextureFormat::RGBA8Unorm;

 class Texture3DTests : public DawnTest {};

 TEST_P(Texture3DTests, Sampling) {
     utils::BasicRenderPass renderPass = utils::CreateBasicRenderPass(device, kRTSize, kRTSize);

     // Set up pipeline. Two triangles will be drawn via the pipeline. They will fill the entire
     // color attachment with data sampled from 3D texture.
     wgpu::ShaderModule vsModule = utils::CreateShaderModule(device, R"(
         @vertex
         fn main(@builtin(vertex_index) VertexIndex : u32) -> @builtin(position) vec4f {
             var pos = array(
                 vec2f(-1.0, 1.0),
                 vec2f( -1.0, -1.0),
                 vec2f(1.0, 1.0),
                 vec2f(1.0, 1.0),
                 vec2f(-1.0, -1.0),
                 vec2f(1.0, -1.0));

             return vec4f(pos[VertexIndex], 0.0, 1.0);
         })");

     wgpu::ShaderModule fsModule = utils::CreateShaderModule(device, R"(
         @group(0) @binding(0) var samp : sampler;
         @group(0) @binding(1) var tex : texture_3d<f32>;

         @fragment
         fn main(@builtin(position) FragCoord : vec4f) -> @location(0) vec4f {
             return textureSample(tex, samp, vec3f(FragCoord.xy / 4.0, 1.5 / 4.0));
         })");

     utils::ComboRenderPipelineDescriptor pipelineDescriptor;
     pipelineDescriptor.vertex.module = vsModule;
     pipelineDescriptor.cFragment.module = fsModule;
     pipelineDescriptor.cTargets[0].format = renderPass.colorFormat;
     wgpu::RenderPipeline pipeline = device.CreateRenderPipeline(&pipelineDescriptor);

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

     wgpu::Extent3D copySize = {kRTSize, kRTSize, kRTSize};

     // Create a 3D texture, fill the texture via a B2T copy with well-designed data.
     // The 3D texture will be used as the data source of a sampler in shader.
     wgpu::TextureDescriptor descriptor;
     descriptor.dimension = wgpu::TextureDimension::e3D;
     descriptor.size = copySize;
     descriptor.format = kFormat;
     descriptor.usage = wgpu::TextureUsage::CopyDst | wgpu::TextureUsage::TextureBinding;
     wgpu::Texture texture = device.CreateTexture(&descriptor);
     wgpu::TextureView textureView = texture.CreateView();

     uint32_t bytesPerRow = utils::GetMinimumBytesPerRow(kFormat, copySize.width);
     uint32_t sizeInBytes =
         utils::RequiredBytesInCopy(bytesPerRow, copySize.height, copySize, kFormat);
     const uint32_t bytesPerTexel = utils::GetTexelBlockSizeInBytes(kFormat);
     uint32_t size = sizeInBytes / bytesPerTexel;
     std::vector<utils::RGBA8> data = std::vector<utils::RGBA8>(size);
     for (uint32_t z = 0; z < copySize.depthOrArrayLayers; ++z) {
         for (uint32_t y = 0; y < copySize.height; ++y) {
             for (uint32_t x = 0; x < copySize.width; ++x) {
                 uint32_t i = (z * copySize.height + y) * bytesPerRow / bytesPerTexel + x;
                 data[i] = utils::RGBA8(x, y, z, 255);
             }
         }
     }
     wgpu::Buffer buffer =
         utils::CreateBufferFromData(device, data.data(), sizeInBytes, wgpu::BufferUsage::CopySrc);

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

     wgpu::ImageCopyBuffer imageCopyBuffer =
         utils::CreateImageCopyBuffer(buffer, 0, bytesPerRow, copySize.height);
     wgpu::ImageCopyTexture imageCopyTexture = utils::CreateImageCopyTexture(texture, 0, {0, 0, 0});
     encoder.CopyBufferToTexture(&imageCopyBuffer, &imageCopyTexture, &copySize);

     wgpu::BindGroup bindGroup = utils::MakeBindGroup(device, pipeline.GetBindGroupLayout(0),
                                                      {{0, sampler}, {1, textureView}});

     wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPass.renderPassInfo);
     pass.SetPipeline(pipeline);
     pass.SetBindGroup(0, bindGroup);
     pass.Draw(6);
     pass.End();

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

     // We sample data from the 3D texture at depth slice 1: 1.5 / 4.0 for z axis in textureSampler()
     // in shader, so the expected color at coordinate(x, y) should be (x, y, 1, 255).
     for (uint32_t i = 0; i < kRTSize; ++i) {
         for (uint32_t j = 0; j < kRTSize; ++j) {
             EXPECT_PIXEL_RGBA8_EQ(utils::RGBA8(i, j, 1, 255), renderPass.color, i, j);
         }
     }
 }

 // Regression test for crbug.com/dawn/2072 where the WSize of D3D UAV descriptor ends up being 0.
 // (which is invalid as noted by the debug layers)
 TEST_P(Texture3DTests, LatestMipClampsDepthSizeForStorageTextures) {
     wgpu::TextureDescriptor tDesc;
     tDesc.dimension = wgpu::TextureDimension::e3D;
     tDesc.size = {2, 2, 1};
     tDesc.mipLevelCount = 2;
     tDesc.usage = wgpu::TextureUsage::StorageBinding;
     tDesc.format = wgpu::TextureFormat::R32Uint;
     wgpu::Texture t = device.CreateTexture(&tDesc);

     wgpu::TextureViewDescriptor vDesc;
     vDesc.baseMipLevel = 1;
     vDesc.mipLevelCount = 1;
     wgpu::TextureView v = t.CreateView(&vDesc);

     wgpu::ComputePipelineDescriptor pDesc;
     pDesc.compute.module = utils::CreateShaderModule(device, R"(
         @group(0) @binding(0) var t : texture_storage_3d<r32uint, write>;
         @compute @workgroup_size(1) fn main() {
             _ = t;
         }
     )");
     wgpu::ComputePipeline pipeline = device.CreateComputePipeline(&pDesc);

     wgpu::BindGroup bg = utils::MakeBindGroup(device, pipeline.GetBindGroupLayout(0), {{0, v}});

     wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
     wgpu::ComputePassEncoder pass = encoder.BeginComputePass();
     pass.SetBindGroup(0, bg);
     pass.SetPipeline(pipeline);
     pass.DispatchWorkgroups(1);
     pass.End();

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

 // Test 3d texture slices used as render attachments.
 TEST_P(Texture3DTests, Rendering) {
     // TODO(crbug.com/dawn/2275): D3D12 debug layer reports the same subresource of 3d texture
     // cannot be written at the same time, which is a bug of D3D12 debug layer.
     // Remove this suppression once the issue is fixed.
     DAWN_SUPPRESS_TEST_IF(IsD3D12() && IsBackendValidationEnabled());

     // Set up pipeline. Bottom-left triangle will be drawn via the pipeline.
     wgpu::ShaderModule vsModule = utils::CreateShaderModule(device, R"(
         @vertex
         fn main(@builtin(vertex_index) VertexIndex : u32) -> @builtin(position) vec4f {
             var pos = array(
                 vec2f(-1.0,  1.0),
                 vec2f( 1.0, -1.0),
                 vec2f(-1.0, -1.0));

             return vec4f(pos[VertexIndex], 0.0, 1.0);
         })");

     wgpu::ShaderModule fsModule = utils::CreateShaderModule(device, R"(
         struct Output {
             @location(0) color0 : vec4f,
             @location(1) color1 : vec4f,
         }

         @fragment
         fn main() -> Output {
             var output : Output;
             output.color0 = vec4f(0.0, 1.0, 0.0, 1.0);
             output.color1 = vec4f(0.0, 1.0, 0.0, 1.0);
             return output;
         })");

     utils::ComboRenderPipelineDescriptor pipelineDescriptor;
     pipelineDescriptor.vertex.module = vsModule;
     pipelineDescriptor.cFragment.module = fsModule;
     pipelineDescriptor.cTargets[0].format = kFormat;
     pipelineDescriptor.cTargets[1].format = kFormat;
     pipelineDescriptor.cFragment.targetCount = 2;
     wgpu::RenderPipeline pipeline = device.CreateRenderPipeline(&pipelineDescriptor);

     // Create a 3D texture and 3D texture view which will be used as a render attachment.
     wgpu::TextureDescriptor textureDescriptor;
     textureDescriptor.dimension = wgpu::TextureDimension::e3D;
     textureDescriptor.size = {kRTSize, kRTSize, kRTSize};
     textureDescriptor.mipLevelCount = 2;
     textureDescriptor.format = kFormat;
     textureDescriptor.usage = wgpu::TextureUsage::CopySrc | wgpu::TextureUsage::RenderAttachment;
     wgpu::Texture renderTarget = device.CreateTexture(&textureDescriptor);

     wgpu::TextureViewDescriptor viewDescriptor;
     viewDescriptor.dimension = wgpu::TextureViewDimension::e3D;
     viewDescriptor.baseMipLevel = 1;
     viewDescriptor.mipLevelCount = 1;
     viewDescriptor.baseArrayLayer = 0;
     viewDescriptor.arrayLayerCount = 1;
     wgpu::TextureView view = renderTarget.CreateView(&viewDescriptor);

     // Clear and render to the depth slice index 0 and 1 of 3D texture at mip level 1
     utils::ComboRenderPassDescriptor renderPass({view, view});
     renderPass.cColorAttachments[0].depthSlice = 0;
     renderPass.cColorAttachments[0].clearValue = {1.0f, 0.0f, 0.0f, 1.0f};
     renderPass.cColorAttachments[1].depthSlice = 1;
     renderPass.cColorAttachments[1].clearValue = {1.0f, 0.0f, 0.0f, 1.0f};

     wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
     wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPass);
     pass.SetPipeline(pipeline);
     pass.Draw(3);
     pass.End();

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

     uint32_t mipSize = std::max(kRTSize >> viewDescriptor.baseMipLevel, 1u);
     std::vector<utils::RGBA8> expected(mipSize * mipSize);
     // Only bottom-left triangle should be drawn with green color (0, 255, 0, 255), other pixels
     // stay red color (255, 0, 0, 255).
     for (uint32_t i = 0; i < mipSize; ++i) {
         for (uint32_t j = 0; j < mipSize; ++j) {
             expected[i * mipSize + j] =
                 j < i ? utils::RGBA8(0, 255, 0, 255) : utils::RGBA8(255, 0, 0, 255);
         }
     }

     EXPECT_TEXTURE_EQ(expected.data(), renderTarget, {0, 0, 0}, {mipSize, mipSize, 1},
                       viewDescriptor.baseMipLevel);
     EXPECT_TEXTURE_EQ(expected.data(), renderTarget, {0, 0, 1}, {mipSize, mipSize, 1},
                       viewDescriptor.baseMipLevel);
 }

 DAWN_INSTANTIATE_TEST(Texture3DTests,
                       D3D11Backend(),
                       D3D12Backend(),
                       MetalBackend(),
                       OpenGLBackend(),
                       OpenGLESBackend(),
                       VulkanBackend());

 }  // anonymous namespace
 }  // namespace dawn
	// Copyright 2021 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 <algorithm>
	#include <vector>

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

	namespace dawn {
	namespace {

	constexpr static uint32_t kRTSize = 4;
	constexpr wgpu::TextureFormat kFormat = wgpu::TextureFormat::RGBA8Unorm;

	class Texture3DTests : public DawnTest {};

	TEST_P(Texture3DTests, Sampling) {
	utils::BasicRenderPass renderPass = utils::CreateBasicRenderPass(device, kRTSize, kRTSize);

	// Set up pipeline. Two triangles will be drawn via the pipeline. They will fill the entire
	// color attachment with data sampled from 3D texture.
	wgpu::ShaderModule vsModule = utils::CreateShaderModule(device, R"(
	@vertex
	fn main(@builtin(vertex_index) VertexIndex : u32) -> @builtin(position) vec4f {
	var pos = array(
	vec2f(-1.0, 1.0),
	vec2f( -1.0, -1.0),
	vec2f(1.0, 1.0),
	vec2f(1.0, 1.0),
	vec2f(-1.0, -1.0),
	vec2f(1.0, -1.0));

	return vec4f(pos[VertexIndex], 0.0, 1.0);
	})");

	wgpu::ShaderModule fsModule = utils::CreateShaderModule(device, R"(
	@group(0) @binding(0) var samp : sampler;
	@group(0) @binding(1) var tex : texture_3d<f32>;

	@fragment
	fn main(@builtin(position) FragCoord : vec4f) -> @location(0) vec4f {
	return textureSample(tex, samp, vec3f(FragCoord.xy / 4.0, 1.5 / 4.0));
	})");

	utils::ComboRenderPipelineDescriptor pipelineDescriptor;
	pipelineDescriptor.vertex.module = vsModule;
	pipelineDescriptor.cFragment.module = fsModule;
	pipelineDescriptor.cTargets[0].format = renderPass.colorFormat;
	wgpu::RenderPipeline pipeline = device.CreateRenderPipeline(&pipelineDescriptor);

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

	wgpu::Extent3D copySize = {kRTSize, kRTSize, kRTSize};

	// Create a 3D texture, fill the texture via a B2T copy with well-designed data.
	// The 3D texture will be used as the data source of a sampler in shader.
	wgpu::TextureDescriptor descriptor;
	descriptor.dimension = wgpu::TextureDimension::e3D;
	descriptor.size = copySize;
	descriptor.format = kFormat;
	descriptor.usage = wgpu::TextureUsage::CopyDst \| wgpu::TextureUsage::TextureBinding;
	wgpu::Texture texture = device.CreateTexture(&descriptor);
	wgpu::TextureView textureView = texture.CreateView();

	uint32_t bytesPerRow = utils::GetMinimumBytesPerRow(kFormat, copySize.width);
	uint32_t sizeInBytes =
	utils::RequiredBytesInCopy(bytesPerRow, copySize.height, copySize, kFormat);
	const uint32_t bytesPerTexel = utils::GetTexelBlockSizeInBytes(kFormat);
	uint32_t size = sizeInBytes / bytesPerTexel;
	std::vector<utils::RGBA8> data = std::vector<utils::RGBA8>(size);
	for (uint32_t z = 0; z < copySize.depthOrArrayLayers; ++z) {
	for (uint32_t y = 0; y < copySize.height; ++y) {
	for (uint32_t x = 0; x < copySize.width; ++x) {
	uint32_t i = (z * copySize.height + y) * bytesPerRow / bytesPerTexel + x;
	data[i] = utils::RGBA8(x, y, z, 255);
	}
	}
	}
	wgpu::Buffer buffer =
	utils::CreateBufferFromData(device, data.data(), sizeInBytes, wgpu::BufferUsage::CopySrc);

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

	wgpu::ImageCopyBuffer imageCopyBuffer =
	utils::CreateImageCopyBuffer(buffer, 0, bytesPerRow, copySize.height);
	wgpu::ImageCopyTexture imageCopyTexture = utils::CreateImageCopyTexture(texture, 0, {0, 0, 0});
	encoder.CopyBufferToTexture(&imageCopyBuffer, &imageCopyTexture, &copySize);

	wgpu::BindGroup bindGroup = utils::MakeBindGroup(device, pipeline.GetBindGroupLayout(0),
	{{0, sampler}, {1, textureView}});

	wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPass.renderPassInfo);
	pass.SetPipeline(pipeline);
	pass.SetBindGroup(0, bindGroup);
	pass.Draw(6);
	pass.End();

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

	// We sample data from the 3D texture at depth slice 1: 1.5 / 4.0 for z axis in textureSampler()
	// in shader, so the expected color at coordinate(x, y) should be (x, y, 1, 255).
	for (uint32_t i = 0; i < kRTSize; ++i) {
	for (uint32_t j = 0; j < kRTSize; ++j) {
	EXPECT_PIXEL_RGBA8_EQ(utils::RGBA8(i, j, 1, 255), renderPass.color, i, j);
	}
	}
	}

	// Regression test for crbug.com/dawn/2072 where the WSize of D3D UAV descriptor ends up being 0.
	// (which is invalid as noted by the debug layers)
	TEST_P(Texture3DTests, LatestMipClampsDepthSizeForStorageTextures) {
	wgpu::TextureDescriptor tDesc;
	tDesc.dimension = wgpu::TextureDimension::e3D;
	tDesc.size = {2, 2, 1};
	tDesc.mipLevelCount = 2;
	tDesc.usage = wgpu::TextureUsage::StorageBinding;
	tDesc.format = wgpu::TextureFormat::R32Uint;
	wgpu::Texture t = device.CreateTexture(&tDesc);

	wgpu::TextureViewDescriptor vDesc;
	vDesc.baseMipLevel = 1;
	vDesc.mipLevelCount = 1;
	wgpu::TextureView v = t.CreateView(&vDesc);

	wgpu::ComputePipelineDescriptor pDesc;
	pDesc.compute.module = utils::CreateShaderModule(device, R"(
	@group(0) @binding(0) var t : texture_storage_3d<r32uint, write>;
	@compute @workgroup_size(1) fn main() {
	_ = t;
	}
	)");
	wgpu::ComputePipeline pipeline = device.CreateComputePipeline(&pDesc);

	wgpu::BindGroup bg = utils::MakeBindGroup(device, pipeline.GetBindGroupLayout(0), {{0, v}});

	wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
	wgpu::ComputePassEncoder pass = encoder.BeginComputePass();
	pass.SetBindGroup(0, bg);
	pass.SetPipeline(pipeline);
	pass.DispatchWorkgroups(1);
	pass.End();

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

	// Test 3d texture slices used as render attachments.
	TEST_P(Texture3DTests, Rendering) {
	// TODO(crbug.com/dawn/2275): D3D12 debug layer reports the same subresource of 3d texture
	// cannot be written at the same time, which is a bug of D3D12 debug layer.
	// Remove this suppression once the issue is fixed.
	DAWN_SUPPRESS_TEST_IF(IsD3D12() && IsBackendValidationEnabled());

	// Set up pipeline. Bottom-left triangle will be drawn via the pipeline.
	wgpu::ShaderModule vsModule = utils::CreateShaderModule(device, R"(
	@vertex
	fn main(@builtin(vertex_index) VertexIndex : u32) -> @builtin(position) vec4f {
	var pos = array(
	vec2f(-1.0, 1.0),
	vec2f( 1.0, -1.0),
	vec2f(-1.0, -1.0));

	return vec4f(pos[VertexIndex], 0.0, 1.0);
	})");

	wgpu::ShaderModule fsModule = utils::CreateShaderModule(device, R"(
	struct Output {
	@location(0) color0 : vec4f,
	@location(1) color1 : vec4f,
	}

	@fragment
	fn main() -> Output {
	var output : Output;
	output.color0 = vec4f(0.0, 1.0, 0.0, 1.0);
	output.color1 = vec4f(0.0, 1.0, 0.0, 1.0);
	return output;
	})");

	utils::ComboRenderPipelineDescriptor pipelineDescriptor;
	pipelineDescriptor.vertex.module = vsModule;
	pipelineDescriptor.cFragment.module = fsModule;
	pipelineDescriptor.cTargets[0].format = kFormat;
	pipelineDescriptor.cTargets[1].format = kFormat;
	pipelineDescriptor.cFragment.targetCount = 2;
	wgpu::RenderPipeline pipeline = device.CreateRenderPipeline(&pipelineDescriptor);

	// Create a 3D texture and 3D texture view which will be used as a render attachment.
	wgpu::TextureDescriptor textureDescriptor;
	textureDescriptor.dimension = wgpu::TextureDimension::e3D;
	textureDescriptor.size = {kRTSize, kRTSize, kRTSize};
	textureDescriptor.mipLevelCount = 2;
	textureDescriptor.format = kFormat;
	textureDescriptor.usage = wgpu::TextureUsage::CopySrc \| wgpu::TextureUsage::RenderAttachment;
	wgpu::Texture renderTarget = device.CreateTexture(&textureDescriptor);

	wgpu::TextureViewDescriptor viewDescriptor;
	viewDescriptor.dimension = wgpu::TextureViewDimension::e3D;
	viewDescriptor.baseMipLevel = 1;
	viewDescriptor.mipLevelCount = 1;
	viewDescriptor.baseArrayLayer = 0;
	viewDescriptor.arrayLayerCount = 1;
	wgpu::TextureView view = renderTarget.CreateView(&viewDescriptor);

	// Clear and render to the depth slice index 0 and 1 of 3D texture at mip level 1
	utils::ComboRenderPassDescriptor renderPass({view, view});
	renderPass.cColorAttachments[0].depthSlice = 0;
	renderPass.cColorAttachments[0].clearValue = {1.0f, 0.0f, 0.0f, 1.0f};
	renderPass.cColorAttachments[1].depthSlice = 1;
	renderPass.cColorAttachments[1].clearValue = {1.0f, 0.0f, 0.0f, 1.0f};

	wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
	wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPass);
	pass.SetPipeline(pipeline);
	pass.Draw(3);
	pass.End();

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

	uint32_t mipSize = std::max(kRTSize >> viewDescriptor.baseMipLevel, 1u);
	std::vector<utils::RGBA8> expected(mipSize * mipSize);
	// Only bottom-left triangle should be drawn with green color (0, 255, 0, 255), other pixels
	// stay red color (255, 0, 0, 255).
	for (uint32_t i = 0; i < mipSize; ++i) {
	for (uint32_t j = 0; j < mipSize; ++j) {
	expected[i * mipSize + j] =
	j < i ? utils::RGBA8(0, 255, 0, 255) : utils::RGBA8(255, 0, 0, 255);
	}
	}

	EXPECT_TEXTURE_EQ(expected.data(), renderTarget, {0, 0, 0}, {mipSize, mipSize, 1},
	viewDescriptor.baseMipLevel);
	EXPECT_TEXTURE_EQ(expected.data(), renderTarget, {0, 0, 1}, {mipSize, mipSize, 1},
	viewDescriptor.baseMipLevel);
	}

	DAWN_INSTANTIATE_TEST(Texture3DTests,
	D3D11Backend(),
	D3D12Backend(),
	MetalBackend(),
	OpenGLBackend(),
	OpenGLESBackend(),
	VulkanBackend());

	} // anonymous namespace
	} // namespace dawn