src/dawn/native/vulkan/ResolveTextureLoadingUtilsVk.cpp - dawn - Git at Google

 // Copyright 2024 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/native/vulkan/ResolveTextureLoadingUtilsVk.h"

 #include <sstream>
 #include <string>
 #include <utility>

 #include "absl/container/inlined_vector.h"
 #include "dawn/common/Assert.h"
 #include "dawn/common/Enumerator.h"
 #include "dawn/native/BindGroup.h"
 #include "dawn/native/Commands.h"
 #include "dawn/native/Device.h"
 #include "dawn/native/InternalPipelineStore.h"
 #include "dawn/native/utils/WGPUHelpers.h"
 #include "dawn/native/vulkan/BindGroupLayoutVk.h"
 #include "dawn/native/vulkan/BindGroupVk.h"
 #include "dawn/native/vulkan/DeviceVk.h"
 #include "dawn/native/vulkan/PipelineLayoutVk.h"
 #include "dawn/native/vulkan/RenderPipelineVk.h"
 #include "dawn/native/vulkan/TextureVk.h"
 #include "dawn/native/vulkan/UtilsVulkan.h"
 #include "dawn/native/vulkan/VulkanError.h"
 #include "dawn/native/webgpu_absl_format.h"

 namespace dawn::native::vulkan {

 namespace {

 constexpr char kBlitToColorVS[] = R"(

 @vertex fn vert_fullscreen_quad(
   @builtin(vertex_index) vertex_index : u32,
 ) -> @builtin(position) vec4f {
   const pos = array(
       vec2f(-1.0, -1.0),
       vec2f( 3.0, -1.0),
       vec2f(-1.0,  3.0));
   return vec4f(pos[vertex_index], 0.0, 1.0);
 }
 )";

 std::string GenerateFS(const BlitColorToColorWithDrawPipelineKey& pipelineKey) {
     std::ostringstream outputStructStream;
     std::ostringstream assignOutputsStream;
     std::ostringstream finalStream;

     finalStream << "enable chromium_internal_input_attachments;";

     for (auto i : IterateBitSet(pipelineKey.attachmentsToExpandResolve)) {
         finalStream << absl::StrFormat(
             "@group(0) @binding(%u) @input_attachment_index(%u) var srcTex%u : "
             "input_attachment<f32>;\n",
             i, i, i);

         outputStructStream << absl::StrFormat("@location(%u) output%u : vec4f,\n", i, i);

         assignOutputsStream << absl::StrFormat(
             "\toutputColor.output%u = inputAttachmentLoad(srcTex%u);\n", i, i);
     }

     finalStream << "struct OutputColor {\n" << outputStructStream.str() << "}\n\n";
     finalStream << R"(
 @fragment fn blit_to_color() -> OutputColor {
     var outputColor : OutputColor;
 )" << assignOutputsStream.str()
                 << R"(
     return outputColor;
 })";

     return finalStream.str();
 }

 ResultOrError<Ref<RenderPipelineBase>> GetOrCreateColorBlitPipeline(
     DeviceBase* device,
     const BlitColorToColorWithDrawPipelineKey& pipelineKey,
     uint8_t colorAttachmentCount) {
     InternalPipelineStore* store = device->GetInternalPipelineStore();
     {
         auto it = store->expandResolveTexturePipelines.find(pipelineKey);
         if (it != store->expandResolveTexturePipelines.end()) {
             return it->second;
         }
     }

     // vertex shader.
     Ref<ShaderModuleBase> vshaderModule;
     DAWN_TRY_ASSIGN(vshaderModule, utils::CreateShaderModule(device, kBlitToColorVS));

     // fragment shader's source will depend on pipeline key.
     std::string fsCode = GenerateFS(pipelineKey);
     Ref<ShaderModuleBase> fshaderModule;
     DAWN_TRY_ASSIGN(fshaderModule, utils::CreateShaderModule(
                                        device, fsCode.c_str(),
                                        {tint::wgsl::Extension::kChromiumInternalInputAttachments}));

     FragmentState fragmentState = {};
     fragmentState.module = fshaderModule.Get();

     // Color target states.
     PerColorAttachment<ColorTargetState> colorTargets = {};
     PerColorAttachment<wgpu::ColorTargetStateExpandResolveTextureDawn> msaaExpandResolveStates{};

     for (auto [i, target] : Enumerate(colorTargets)) {
         target.format = pipelineKey.colorTargetFormats[i];
         // We shouldn't change the color targets that are not involved in.
         if (pipelineKey.resolveTargetsMask[i]) {
             target.nextInChain = &msaaExpandResolveStates[i];
             msaaExpandResolveStates[i].enabled = pipelineKey.attachmentsToExpandResolve[i];
             if (msaaExpandResolveStates[i].enabled) {
                 target.writeMask = wgpu::ColorWriteMask::All;
             } else {
                 target.writeMask = wgpu::ColorWriteMask::None;
             }
         } else {
             target.writeMask = wgpu::ColorWriteMask::None;
         }
     }

     fragmentState.targetCount = colorAttachmentCount;
     fragmentState.targets = colorTargets.data();

     RenderPipelineDescriptor renderPipelineDesc = {};
     renderPipelineDesc.label = "blit_color_to_color";
     renderPipelineDesc.vertex.module = vshaderModule.Get();
     renderPipelineDesc.fragment = &fragmentState;

     // Depth stencil state.
     DepthStencilState depthStencilState = {};
     if (pipelineKey.depthStencilFormat != wgpu::TextureFormat::Undefined) {
         depthStencilState.format = pipelineKey.depthStencilFormat;

         renderPipelineDesc.depthStencil = &depthStencilState;
     }

     // Multisample state.
     DAWN_ASSERT(pipelineKey.sampleCount > 1);
     renderPipelineDesc.multisample.count = pipelineKey.sampleCount;

     renderPipelineDesc.layout = nullptr;

     Ref<RenderPipelineBase> pipeline;
     DAWN_TRY_ASSIGN(
         pipeline, device->CreateRenderPipeline(&renderPipelineDesc, /*allowInternalBinding=*/true));

     store->expandResolveTexturePipelines.emplace(pipelineKey, pipeline);
     return pipeline;
 }

 }  // namespace

 MaybeError BeginRenderPassAndExpandResolveTextureWithDraw(Device* device,
                                                           CommandRecordingContext* commandContext,
                                                           const BeginRenderPassCmd* renderPass,
                                                           const VkRenderPassBeginInfo& beginInfo) {
     DAWN_ASSERT(device->IsLockedByCurrentThreadIfNeeded());

     // Construct pipeline key
     BlitColorToColorWithDrawPipelineKey pipelineKey;
     ColorAttachmentIndex colorAttachmentCount =
         GetHighestBitIndexPlusOne(renderPass->attachmentState->GetColorAttachmentsMask());
     for (ColorAttachmentIndex colorIdx :
          IterateBitSet(renderPass->attachmentState->GetColorAttachmentsMask())) {
         const auto& colorAttachment = renderPass->colorAttachments[colorIdx];
         const auto& view = colorAttachment.view;
         DAWN_ASSERT(view != nullptr);
         const Format& format = view->GetFormat();
         TextureComponentType baseType = format.GetAspectInfo(Aspect::Color).baseType;
         // Blitting integer textures are not currently supported.
         DAWN_ASSERT(baseType == TextureComponentType::Float);

         if (colorAttachment.loadOp == wgpu::LoadOp::ExpandResolveTexture) {
             // TODO(42240662): Handle the cases where resolveTarget is altered by workarounds such
             // as ResolveMultipleAttachmentInSeparatePasses/AlwaysResolveIntoZeroLevelAndLayer. We
             // need to careful handle such cases because the render pass' compatibility could be
             // affected as well.
             DAWN_INVALID_IF(colorAttachment.resolveTarget == nullptr,
                             "resolveTarget at %d has been removed by some workarounds. %s doesn't "
                             "support this yet.",
                             colorIdx, colorAttachment.loadOp);
             DAWN_ASSERT(colorAttachment.resolveTarget->GetLayerCount() == 1u);
             DAWN_ASSERT(colorAttachment.resolveTarget->GetDimension() ==
                         wgpu::TextureViewDimension::e2D);
             pipelineKey.attachmentsToExpandResolve.set(colorIdx);
         }
         pipelineKey.resolveTargetsMask.set(colorIdx, colorAttachment.resolveTarget != nullptr);

         pipelineKey.colorTargetFormats[colorIdx] = format.format;
         pipelineKey.sampleCount = view->GetTexture()->GetSampleCount();
     }

     DAWN_ASSERT(pipelineKey.attachmentsToExpandResolve.any());

     pipelineKey.depthStencilFormat = wgpu::TextureFormat::Undefined;
     if (renderPass->depthStencilAttachment.view != nullptr) {
         pipelineKey.depthStencilFormat =
             renderPass->depthStencilAttachment.view->GetFormat().format;
     }

     Ref<RenderPipelineBase> pipeline;
     DAWN_TRY_ASSIGN(pipeline, GetOrCreateColorBlitPipeline(
                                   device, pipelineKey, static_cast<uint8_t>(colorAttachmentCount)));

     RenderPipeline* pipelineVk = ToBackend(pipeline.Get());
     PipelineLayout* layoutVk = ToBackend(pipeline->GetLayout());
     DAWN_ASSERT(layoutVk != nullptr);

     // Construct bind group.
     Ref<BindGroupLayoutBase> bgl;
     DAWN_TRY_ASSIGN(bgl, pipelineVk->GetBindGroupLayout(0));

     Ref<BindGroupBase> bindGroup;
     absl::InlinedVector<BindGroupEntry, kMaxColorAttachments> bgEntries = {};

     for (auto colorIdx : IterateBitSet(pipelineKey.attachmentsToExpandResolve)) {
         const auto& colorAttachment = renderPass->colorAttachments[colorIdx];
         bgEntries.push_back({});
         auto& bgEntry = bgEntries.back();
         bgEntry.binding = static_cast<uint8_t>(colorIdx);
         bgEntry.textureView = colorAttachment.resolveTarget.Get();

         // Transition the resolve texture
         auto* textureVk = static_cast<Texture*>(colorAttachment.resolveTarget->GetTexture());
         textureVk->TransitionUsageNow(commandContext, kResolveAttachmentLoadingUsage,
                                       wgpu::ShaderStage::Fragment,
                                       colorAttachment.resolveTarget->GetSubresourceRange());
     }

     BindGroupDescriptor bgDesc = {};
     bgDesc.layout = bgl.Get();
     bgDesc.entryCount = bgEntries.size();
     bgDesc.entries = bgEntries.data();
     DAWN_TRY_ASSIGN(bindGroup, device->CreateBindGroup(&bgDesc, UsageValidationMode::Internal));
     BindGroup* bindGroupVk = ToBackend(bindGroup.Get());

     // Start the render pass
     VkCommandBuffer commandBuffer = commandContext->commandBuffer;

     device->fn.CmdBeginRenderPass(commandBuffer, &beginInfo, VK_SUBPASS_CONTENTS_INLINE);

     // Draw to perform the blit.
     VkViewport viewport{};
     viewport.x = 0.0f;
     viewport.y = 0.0f;
     viewport.width = static_cast<float>(renderPass->width);
     viewport.height = static_cast<float>(renderPass->height);
     viewport.minDepth = 0.0f;
     viewport.maxDepth = 1.0f;
     device->fn.CmdSetViewport(commandBuffer, 0, 1, &viewport);

     VkRect2D scissor{};
     scissor.offset = {0, 0};
     scissor.extent.width = renderPass->width;
     scissor.extent.height = renderPass->height;
     device->fn.CmdSetScissor(commandBuffer, 0, 1, &scissor);

     device->fn.CmdBindPipeline(commandBuffer, VK_PIPELINE_BIND_POINT_GRAPHICS,
                                *pipelineVk->GetHandle());
     device->fn.CmdBindDescriptorSets(commandBuffer, VK_PIPELINE_BIND_POINT_GRAPHICS,
                                      *layoutVk->GetHandle(), 0, 1, &*bindGroupVk->GetHandle(), 0,
                                      nullptr);
     device->fn.CmdDraw(commandBuffer, 3, 1, 0, 0);

     device->fn.CmdNextSubpass(commandBuffer, VK_SUBPASS_CONTENTS_INLINE);

     // Subpass dependency automatically transitions the layouts of the resolve textures
     // to RenderAttachment. So we need to notify TextureVk and don't need to use any explicit
     // barriers.
     for (auto colorIdx : IterateBitSet(pipelineKey.attachmentsToExpandResolve)) {
         const auto& colorAttachment = renderPass->colorAttachments[colorIdx];
         auto* textureVk = static_cast<Texture*>(colorAttachment.resolveTarget->GetTexture());
         textureVk->UpdateUsage(wgpu::TextureUsage::RenderAttachment, wgpu::ShaderStage::Fragment,
                                colorAttachment.resolveTarget->GetSubresourceRange());
     }

     return {};
 }
 }  // namespace dawn::native::vulkan
	// Copyright 2024 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/native/vulkan/ResolveTextureLoadingUtilsVk.h"

	#include <sstream>
	#include <string>
	#include <utility>

	#include "absl/container/inlined_vector.h"
	#include "dawn/common/Assert.h"
	#include "dawn/common/Enumerator.h"
	#include "dawn/native/BindGroup.h"
	#include "dawn/native/Commands.h"
	#include "dawn/native/Device.h"
	#include "dawn/native/InternalPipelineStore.h"
	#include "dawn/native/utils/WGPUHelpers.h"
	#include "dawn/native/vulkan/BindGroupLayoutVk.h"
	#include "dawn/native/vulkan/BindGroupVk.h"
	#include "dawn/native/vulkan/DeviceVk.h"
	#include "dawn/native/vulkan/PipelineLayoutVk.h"
	#include "dawn/native/vulkan/RenderPipelineVk.h"
	#include "dawn/native/vulkan/TextureVk.h"
	#include "dawn/native/vulkan/UtilsVulkan.h"
	#include "dawn/native/vulkan/VulkanError.h"
	#include "dawn/native/webgpu_absl_format.h"

	namespace dawn::native::vulkan {

	namespace {

	constexpr char kBlitToColorVS[] = R"(

	@vertex fn vert_fullscreen_quad(
	@builtin(vertex_index) vertex_index : u32,
	) -> @builtin(position) vec4f {
	const pos = array(
	vec2f(-1.0, -1.0),
	vec2f( 3.0, -1.0),
	vec2f(-1.0, 3.0));
	return vec4f(pos[vertex_index], 0.0, 1.0);
	}
	)";

	std::string GenerateFS(const BlitColorToColorWithDrawPipelineKey& pipelineKey) {
	std::ostringstream outputStructStream;
	std::ostringstream assignOutputsStream;
	std::ostringstream finalStream;

	finalStream << "enable chromium_internal_input_attachments;";

	for (auto i : IterateBitSet(pipelineKey.attachmentsToExpandResolve)) {
	finalStream << absl::StrFormat(
	"@group(0) @binding(%u) @input_attachment_index(%u) var srcTex%u : "
	"input_attachment<f32>;\n",
	i, i, i);

	outputStructStream << absl::StrFormat("@location(%u) output%u : vec4f,\n", i, i);

	assignOutputsStream << absl::StrFormat(
	"\toutputColor.output%u = inputAttachmentLoad(srcTex%u);\n", i, i);
	}

	finalStream << "struct OutputColor {\n" << outputStructStream.str() << "}\n\n";
	finalStream << R"(
	@fragment fn blit_to_color() -> OutputColor {
	var outputColor : OutputColor;
	)" << assignOutputsStream.str()
	<< R"(
	return outputColor;
	})";

	return finalStream.str();
	}

	ResultOrError<Ref<RenderPipelineBase>> GetOrCreateColorBlitPipeline(
	DeviceBase* device,
	const BlitColorToColorWithDrawPipelineKey& pipelineKey,
	uint8_t colorAttachmentCount) {
	InternalPipelineStore* store = device->GetInternalPipelineStore();
	{
	auto it = store->expandResolveTexturePipelines.find(pipelineKey);
	if (it != store->expandResolveTexturePipelines.end()) {
	return it->second;
	}
	}

	// vertex shader.
	Ref<ShaderModuleBase> vshaderModule;
	DAWN_TRY_ASSIGN(vshaderModule, utils::CreateShaderModule(device, kBlitToColorVS));

	// fragment shader's source will depend on pipeline key.
	std::string fsCode = GenerateFS(pipelineKey);
	Ref<ShaderModuleBase> fshaderModule;
	DAWN_TRY_ASSIGN(fshaderModule, utils::CreateShaderModule(
	device, fsCode.c_str(),
	{tint::wgsl::Extension::kChromiumInternalInputAttachments}));

	FragmentState fragmentState = {};
	fragmentState.module = fshaderModule.Get();

	// Color target states.
	PerColorAttachment<ColorTargetState> colorTargets = {};
	PerColorAttachment<wgpu::ColorTargetStateExpandResolveTextureDawn> msaaExpandResolveStates{};

	for (auto [i, target] : Enumerate(colorTargets)) {
	target.format = pipelineKey.colorTargetFormats[i];
	// We shouldn't change the color targets that are not involved in.
	if (pipelineKey.resolveTargetsMask[i]) {
	target.nextInChain = &msaaExpandResolveStates[i];
	msaaExpandResolveStates[i].enabled = pipelineKey.attachmentsToExpandResolve[i];
	if (msaaExpandResolveStates[i].enabled) {
	target.writeMask = wgpu::ColorWriteMask::All;
	} else {
	target.writeMask = wgpu::ColorWriteMask::None;
	}
	} else {
	target.writeMask = wgpu::ColorWriteMask::None;
	}
	}

	fragmentState.targetCount = colorAttachmentCount;
	fragmentState.targets = colorTargets.data();

	RenderPipelineDescriptor renderPipelineDesc = {};
	renderPipelineDesc.label = "blit_color_to_color";
	renderPipelineDesc.vertex.module = vshaderModule.Get();
	renderPipelineDesc.fragment = &fragmentState;

	// Depth stencil state.
	DepthStencilState depthStencilState = {};
	if (pipelineKey.depthStencilFormat != wgpu::TextureFormat::Undefined) {
	depthStencilState.format = pipelineKey.depthStencilFormat;

	renderPipelineDesc.depthStencil = &depthStencilState;
	}

	// Multisample state.
	DAWN_ASSERT(pipelineKey.sampleCount > 1);
	renderPipelineDesc.multisample.count = pipelineKey.sampleCount;

	renderPipelineDesc.layout = nullptr;

	Ref<RenderPipelineBase> pipeline;
	DAWN_TRY_ASSIGN(
	pipeline, device->CreateRenderPipeline(&renderPipelineDesc, /allowInternalBinding=/true));

	store->expandResolveTexturePipelines.emplace(pipelineKey, pipeline);
	return pipeline;
	}

	} // namespace

	MaybeError BeginRenderPassAndExpandResolveTextureWithDraw(Device* device,
	CommandRecordingContext* commandContext,
	const BeginRenderPassCmd* renderPass,
	const VkRenderPassBeginInfo& beginInfo) {
	DAWN_ASSERT(device->IsLockedByCurrentThreadIfNeeded());

	// Construct pipeline key
	BlitColorToColorWithDrawPipelineKey pipelineKey;
	ColorAttachmentIndex colorAttachmentCount =
	GetHighestBitIndexPlusOne(renderPass->attachmentState->GetColorAttachmentsMask());
	for (ColorAttachmentIndex colorIdx :
	IterateBitSet(renderPass->attachmentState->GetColorAttachmentsMask())) {
	const auto& colorAttachment = renderPass->colorAttachments[colorIdx];
	const auto& view = colorAttachment.view;
	DAWN_ASSERT(view != nullptr);
	const Format& format = view->GetFormat();
	TextureComponentType baseType = format.GetAspectInfo(Aspect::Color).baseType;
	// Blitting integer textures are not currently supported.
	DAWN_ASSERT(baseType == TextureComponentType::Float);

	if (colorAttachment.loadOp == wgpu::LoadOp::ExpandResolveTexture) {
	// TODO(42240662): Handle the cases where resolveTarget is altered by workarounds such
	// as ResolveMultipleAttachmentInSeparatePasses/AlwaysResolveIntoZeroLevelAndLayer. We
	// need to careful handle such cases because the render pass' compatibility could be
	// affected as well.
	DAWN_INVALID_IF(colorAttachment.resolveTarget == nullptr,
	"resolveTarget at %d has been removed by some workarounds. %s doesn't "
	"support this yet.",
	colorIdx, colorAttachment.loadOp);
	DAWN_ASSERT(colorAttachment.resolveTarget->GetLayerCount() == 1u);
	DAWN_ASSERT(colorAttachment.resolveTarget->GetDimension() ==
	wgpu::TextureViewDimension::e2D);
	pipelineKey.attachmentsToExpandResolve.set(colorIdx);
	}
	pipelineKey.resolveTargetsMask.set(colorIdx, colorAttachment.resolveTarget != nullptr);

	pipelineKey.colorTargetFormats[colorIdx] = format.format;
	pipelineKey.sampleCount = view->GetTexture()->GetSampleCount();
	}

	DAWN_ASSERT(pipelineKey.attachmentsToExpandResolve.any());

	pipelineKey.depthStencilFormat = wgpu::TextureFormat::Undefined;
	if (renderPass->depthStencilAttachment.view != nullptr) {
	pipelineKey.depthStencilFormat =
	renderPass->depthStencilAttachment.view->GetFormat().format;
	}

	Ref<RenderPipelineBase> pipeline;
	DAWN_TRY_ASSIGN(pipeline, GetOrCreateColorBlitPipeline(
	device, pipelineKey, static_cast<uint8_t>(colorAttachmentCount)));

	RenderPipeline* pipelineVk = ToBackend(pipeline.Get());
	PipelineLayout* layoutVk = ToBackend(pipeline->GetLayout());
	DAWN_ASSERT(layoutVk != nullptr);

	// Construct bind group.
	Ref<BindGroupLayoutBase> bgl;
	DAWN_TRY_ASSIGN(bgl, pipelineVk->GetBindGroupLayout(0));

	Ref<BindGroupBase> bindGroup;
	absl::InlinedVector<BindGroupEntry, kMaxColorAttachments> bgEntries = {};

	for (auto colorIdx : IterateBitSet(pipelineKey.attachmentsToExpandResolve)) {
	const auto& colorAttachment = renderPass->colorAttachments[colorIdx];
	bgEntries.push_back({});
	auto& bgEntry = bgEntries.back();
	bgEntry.binding = static_cast<uint8_t>(colorIdx);
	bgEntry.textureView = colorAttachment.resolveTarget.Get();

	// Transition the resolve texture
	auto* textureVk = static_cast<Texture*>(colorAttachment.resolveTarget->GetTexture());
	textureVk->TransitionUsageNow(commandContext, kResolveAttachmentLoadingUsage,
	wgpu::ShaderStage::Fragment,
	colorAttachment.resolveTarget->GetSubresourceRange());
	}

	BindGroupDescriptor bgDesc = {};
	bgDesc.layout = bgl.Get();
	bgDesc.entryCount = bgEntries.size();
	bgDesc.entries = bgEntries.data();
	DAWN_TRY_ASSIGN(bindGroup, device->CreateBindGroup(&bgDesc, UsageValidationMode::Internal));
	BindGroup* bindGroupVk = ToBackend(bindGroup.Get());

	// Start the render pass
	VkCommandBuffer commandBuffer = commandContext->commandBuffer;

	device->fn.CmdBeginRenderPass(commandBuffer, &beginInfo, VK_SUBPASS_CONTENTS_INLINE);

	// Draw to perform the blit.
	VkViewport viewport{};
	viewport.x = 0.0f;
	viewport.y = 0.0f;
	viewport.width = static_cast<float>(renderPass->width);
	viewport.height = static_cast<float>(renderPass->height);
	viewport.minDepth = 0.0f;
	viewport.maxDepth = 1.0f;
	device->fn.CmdSetViewport(commandBuffer, 0, 1, &viewport);

	VkRect2D scissor{};
	scissor.offset = {0, 0};
	scissor.extent.width = renderPass->width;
	scissor.extent.height = renderPass->height;
	device->fn.CmdSetScissor(commandBuffer, 0, 1, &scissor);

	device->fn.CmdBindPipeline(commandBuffer, VK_PIPELINE_BIND_POINT_GRAPHICS,
	*pipelineVk->GetHandle());
	device->fn.CmdBindDescriptorSets(commandBuffer, VK_PIPELINE_BIND_POINT_GRAPHICS,
	layoutVk->GetHandle(), 0, 1, &bindGroupVk->GetHandle(), 0,
	nullptr);
	device->fn.CmdDraw(commandBuffer, 3, 1, 0, 0);

	device->fn.CmdNextSubpass(commandBuffer, VK_SUBPASS_CONTENTS_INLINE);

	// Subpass dependency automatically transitions the layouts of the resolve textures
	// to RenderAttachment. So we need to notify TextureVk and don't need to use any explicit
	// barriers.
	for (auto colorIdx : IterateBitSet(pipelineKey.attachmentsToExpandResolve)) {
	const auto& colorAttachment = renderPass->colorAttachments[colorIdx];
	auto* textureVk = static_cast<Texture*>(colorAttachment.resolveTarget->GetTexture());
	textureVk->UpdateUsage(wgpu::TextureUsage::RenderAttachment, wgpu::ShaderStage::Fragment,
	colorAttachment.resolveTarget->GetSubresourceRange());
	}

	return {};
	}
	} // namespace dawn::native::vulkan