// Copyright 2018 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "dawn/native/vulkan/RenderPipelineVk.h"

#include <memory>
#include <utility>
#include <vector>

#include "dawn/native/CreatePipelineAsyncTask.h"
#include "dawn/native/vulkan/DeviceVk.h"
#include "dawn/native/vulkan/FencedDeleter.h"
#include "dawn/native/vulkan/PipelineLayoutVk.h"
#include "dawn/native/vulkan/RenderPassCache.h"
#include "dawn/native/vulkan/ShaderModuleVk.h"
#include "dawn/native/vulkan/TextureVk.h"
#include "dawn/native/vulkan/UtilsVulkan.h"
#include "dawn/native/vulkan/VulkanError.h"

namespace dawn::native::vulkan {

namespace {

VkVertexInputRate VulkanInputRate(wgpu::VertexStepMode stepMode) {
    switch (stepMode) {
        case wgpu::VertexStepMode::Vertex:
            return VK_VERTEX_INPUT_RATE_VERTEX;
        case wgpu::VertexStepMode::Instance:
            return VK_VERTEX_INPUT_RATE_INSTANCE;
    }
    UNREACHABLE();
}

VkFormat VulkanVertexFormat(wgpu::VertexFormat format) {
    switch (format) {
        case wgpu::VertexFormat::Uint8x2:
            return VK_FORMAT_R8G8_UINT;
        case wgpu::VertexFormat::Uint8x4:
            return VK_FORMAT_R8G8B8A8_UINT;
        case wgpu::VertexFormat::Sint8x2:
            return VK_FORMAT_R8G8_SINT;
        case wgpu::VertexFormat::Sint8x4:
            return VK_FORMAT_R8G8B8A8_SINT;
        case wgpu::VertexFormat::Unorm8x2:
            return VK_FORMAT_R8G8_UNORM;
        case wgpu::VertexFormat::Unorm8x4:
            return VK_FORMAT_R8G8B8A8_UNORM;
        case wgpu::VertexFormat::Snorm8x2:
            return VK_FORMAT_R8G8_SNORM;
        case wgpu::VertexFormat::Snorm8x4:
            return VK_FORMAT_R8G8B8A8_SNORM;
        case wgpu::VertexFormat::Uint16x2:
            return VK_FORMAT_R16G16_UINT;
        case wgpu::VertexFormat::Uint16x4:
            return VK_FORMAT_R16G16B16A16_UINT;
        case wgpu::VertexFormat::Sint16x2:
            return VK_FORMAT_R16G16_SINT;
        case wgpu::VertexFormat::Sint16x4:
            return VK_FORMAT_R16G16B16A16_SINT;
        case wgpu::VertexFormat::Unorm16x2:
            return VK_FORMAT_R16G16_UNORM;
        case wgpu::VertexFormat::Unorm16x4:
            return VK_FORMAT_R16G16B16A16_UNORM;
        case wgpu::VertexFormat::Snorm16x2:
            return VK_FORMAT_R16G16_SNORM;
        case wgpu::VertexFormat::Snorm16x4:
            return VK_FORMAT_R16G16B16A16_SNORM;
        case wgpu::VertexFormat::Float16x2:
            return VK_FORMAT_R16G16_SFLOAT;
        case wgpu::VertexFormat::Float16x4:
            return VK_FORMAT_R16G16B16A16_SFLOAT;
        case wgpu::VertexFormat::Float32:
            return VK_FORMAT_R32_SFLOAT;
        case wgpu::VertexFormat::Float32x2:
            return VK_FORMAT_R32G32_SFLOAT;
        case wgpu::VertexFormat::Float32x3:
            return VK_FORMAT_R32G32B32_SFLOAT;
        case wgpu::VertexFormat::Float32x4:
            return VK_FORMAT_R32G32B32A32_SFLOAT;
        case wgpu::VertexFormat::Uint32:
            return VK_FORMAT_R32_UINT;
        case wgpu::VertexFormat::Uint32x2:
            return VK_FORMAT_R32G32_UINT;
        case wgpu::VertexFormat::Uint32x3:
            return VK_FORMAT_R32G32B32_UINT;
        case wgpu::VertexFormat::Uint32x4:
            return VK_FORMAT_R32G32B32A32_UINT;
        case wgpu::VertexFormat::Sint32:
            return VK_FORMAT_R32_SINT;
        case wgpu::VertexFormat::Sint32x2:
            return VK_FORMAT_R32G32_SINT;
        case wgpu::VertexFormat::Sint32x3:
            return VK_FORMAT_R32G32B32_SINT;
        case wgpu::VertexFormat::Sint32x4:
            return VK_FORMAT_R32G32B32A32_SINT;
        default:
            UNREACHABLE();
    }
}

VkPrimitiveTopology VulkanPrimitiveTopology(wgpu::PrimitiveTopology topology) {
    switch (topology) {
        case wgpu::PrimitiveTopology::PointList:
            return VK_PRIMITIVE_TOPOLOGY_POINT_LIST;
        case wgpu::PrimitiveTopology::LineList:
            return VK_PRIMITIVE_TOPOLOGY_LINE_LIST;
        case wgpu::PrimitiveTopology::LineStrip:
            return VK_PRIMITIVE_TOPOLOGY_LINE_STRIP;
        case wgpu::PrimitiveTopology::TriangleList:
            return VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST;
        case wgpu::PrimitiveTopology::TriangleStrip:
            return VK_PRIMITIVE_TOPOLOGY_TRIANGLE_STRIP;
    }
    UNREACHABLE();
}

bool ShouldEnablePrimitiveRestart(wgpu::PrimitiveTopology topology) {
    // Primitive restart is always enabled in WebGPU but Vulkan validation rules ask that
    // primitive restart be only enabled on primitive topologies that support restarting.
    switch (topology) {
        case wgpu::PrimitiveTopology::PointList:
        case wgpu::PrimitiveTopology::LineList:
        case wgpu::PrimitiveTopology::TriangleList:
            return false;
        case wgpu::PrimitiveTopology::LineStrip:
        case wgpu::PrimitiveTopology::TriangleStrip:
            return true;
    }
    UNREACHABLE();
}

VkFrontFace VulkanFrontFace(wgpu::FrontFace face) {
    switch (face) {
        case wgpu::FrontFace::CCW:
            return VK_FRONT_FACE_COUNTER_CLOCKWISE;
        case wgpu::FrontFace::CW:
            return VK_FRONT_FACE_CLOCKWISE;
    }
    UNREACHABLE();
}

VkCullModeFlagBits VulkanCullMode(wgpu::CullMode mode) {
    switch (mode) {
        case wgpu::CullMode::None:
            return VK_CULL_MODE_NONE;
        case wgpu::CullMode::Front:
            return VK_CULL_MODE_FRONT_BIT;
        case wgpu::CullMode::Back:
            return VK_CULL_MODE_BACK_BIT;
    }
    UNREACHABLE();
}

VkBlendFactor VulkanBlendFactor(wgpu::BlendFactor factor) {
    switch (factor) {
        case wgpu::BlendFactor::Zero:
            return VK_BLEND_FACTOR_ZERO;
        case wgpu::BlendFactor::One:
            return VK_BLEND_FACTOR_ONE;
        case wgpu::BlendFactor::Src:
            return VK_BLEND_FACTOR_SRC_COLOR;
        case wgpu::BlendFactor::OneMinusSrc:
            return VK_BLEND_FACTOR_ONE_MINUS_SRC_COLOR;
        case wgpu::BlendFactor::SrcAlpha:
            return VK_BLEND_FACTOR_SRC_ALPHA;
        case wgpu::BlendFactor::OneMinusSrcAlpha:
            return VK_BLEND_FACTOR_ONE_MINUS_SRC_ALPHA;
        case wgpu::BlendFactor::Dst:
            return VK_BLEND_FACTOR_DST_COLOR;
        case wgpu::BlendFactor::OneMinusDst:
            return VK_BLEND_FACTOR_ONE_MINUS_DST_COLOR;
        case wgpu::BlendFactor::DstAlpha:
            return VK_BLEND_FACTOR_DST_ALPHA;
        case wgpu::BlendFactor::OneMinusDstAlpha:
            return VK_BLEND_FACTOR_ONE_MINUS_DST_ALPHA;
        case wgpu::BlendFactor::SrcAlphaSaturated:
            return VK_BLEND_FACTOR_SRC_ALPHA_SATURATE;
        case wgpu::BlendFactor::Constant:
            return VK_BLEND_FACTOR_CONSTANT_COLOR;
        case wgpu::BlendFactor::OneMinusConstant:
            return VK_BLEND_FACTOR_ONE_MINUS_CONSTANT_COLOR;
    }
    UNREACHABLE();
}

VkBlendOp VulkanBlendOperation(wgpu::BlendOperation operation) {
    switch (operation) {
        case wgpu::BlendOperation::Add:
            return VK_BLEND_OP_ADD;
        case wgpu::BlendOperation::Subtract:
            return VK_BLEND_OP_SUBTRACT;
        case wgpu::BlendOperation::ReverseSubtract:
            return VK_BLEND_OP_REVERSE_SUBTRACT;
        case wgpu::BlendOperation::Min:
            return VK_BLEND_OP_MIN;
        case wgpu::BlendOperation::Max:
            return VK_BLEND_OP_MAX;
    }
    UNREACHABLE();
}

VkColorComponentFlags VulkanColorWriteMask(wgpu::ColorWriteMask mask,
                                           bool isDeclaredInFragmentShader) {
    // Vulkan and Dawn color write masks match, static assert it and return the mask
    static_assert(static_cast<VkColorComponentFlagBits>(wgpu::ColorWriteMask::Red) ==
                  VK_COLOR_COMPONENT_R_BIT);
    static_assert(static_cast<VkColorComponentFlagBits>(wgpu::ColorWriteMask::Green) ==
                  VK_COLOR_COMPONENT_G_BIT);
    static_assert(static_cast<VkColorComponentFlagBits>(wgpu::ColorWriteMask::Blue) ==
                  VK_COLOR_COMPONENT_B_BIT);
    static_assert(static_cast<VkColorComponentFlagBits>(wgpu::ColorWriteMask::Alpha) ==
                  VK_COLOR_COMPONENT_A_BIT);

    // According to Vulkan SPEC (Chapter 14.3): "The input values to blending or color
    // attachment writes are undefined for components which do not correspond to a fragment
    // shader outputs", we set the color write mask to 0 to prevent such undefined values
    // being written into the color attachments.
    return isDeclaredInFragmentShader ? static_cast<VkColorComponentFlags>(mask)
                                      : static_cast<VkColorComponentFlags>(0);
}

VkPipelineColorBlendAttachmentState ComputeColorDesc(const ColorTargetState* state,
                                                     bool isDeclaredInFragmentShader) {
    VkPipelineColorBlendAttachmentState attachment;
    attachment.blendEnable = state->blend != nullptr ? VK_TRUE : VK_FALSE;
    if (attachment.blendEnable) {
        attachment.srcColorBlendFactor = VulkanBlendFactor(state->blend->color.srcFactor);
        attachment.dstColorBlendFactor = VulkanBlendFactor(state->blend->color.dstFactor);
        attachment.colorBlendOp = VulkanBlendOperation(state->blend->color.operation);
        attachment.srcAlphaBlendFactor = VulkanBlendFactor(state->blend->alpha.srcFactor);
        attachment.dstAlphaBlendFactor = VulkanBlendFactor(state->blend->alpha.dstFactor);
        attachment.alphaBlendOp = VulkanBlendOperation(state->blend->alpha.operation);
    } else {
        // Swiftshader's Vulkan implementation appears to expect these values to be valid
        // even when blending is not enabled.
        attachment.srcColorBlendFactor = VK_BLEND_FACTOR_ONE;
        attachment.dstColorBlendFactor = VK_BLEND_FACTOR_ZERO;
        attachment.colorBlendOp = VK_BLEND_OP_ADD;
        attachment.srcAlphaBlendFactor = VK_BLEND_FACTOR_ONE;
        attachment.dstAlphaBlendFactor = VK_BLEND_FACTOR_ZERO;
        attachment.alphaBlendOp = VK_BLEND_OP_ADD;
    }
    attachment.colorWriteMask = VulkanColorWriteMask(state->writeMask, isDeclaredInFragmentShader);
    return attachment;
}

VkStencilOp VulkanStencilOp(wgpu::StencilOperation op) {
    switch (op) {
        case wgpu::StencilOperation::Keep:
            return VK_STENCIL_OP_KEEP;
        case wgpu::StencilOperation::Zero:
            return VK_STENCIL_OP_ZERO;
        case wgpu::StencilOperation::Replace:
            return VK_STENCIL_OP_REPLACE;
        case wgpu::StencilOperation::IncrementClamp:
            return VK_STENCIL_OP_INCREMENT_AND_CLAMP;
        case wgpu::StencilOperation::DecrementClamp:
            return VK_STENCIL_OP_DECREMENT_AND_CLAMP;
        case wgpu::StencilOperation::Invert:
            return VK_STENCIL_OP_INVERT;
        case wgpu::StencilOperation::IncrementWrap:
            return VK_STENCIL_OP_INCREMENT_AND_WRAP;
        case wgpu::StencilOperation::DecrementWrap:
            return VK_STENCIL_OP_DECREMENT_AND_WRAP;
    }
    UNREACHABLE();
}

VkPipelineDepthStencilStateCreateInfo ComputeDepthStencilDesc(const DepthStencilState* descriptor) {
    VkPipelineDepthStencilStateCreateInfo depthStencilState;
    depthStencilState.sType = VK_STRUCTURE_TYPE_PIPELINE_DEPTH_STENCIL_STATE_CREATE_INFO;
    depthStencilState.pNext = nullptr;
    depthStencilState.flags = 0;

    // Depth writes only occur if depth is enabled
    depthStencilState.depthTestEnable =
        (descriptor->depthCompare == wgpu::CompareFunction::Always &&
         !descriptor->depthWriteEnabled)
            ? VK_FALSE
            : VK_TRUE;
    depthStencilState.depthWriteEnable = descriptor->depthWriteEnabled ? VK_TRUE : VK_FALSE;
    depthStencilState.depthCompareOp = ToVulkanCompareOp(descriptor->depthCompare);
    depthStencilState.depthBoundsTestEnable = false;
    depthStencilState.minDepthBounds = 0.0f;
    depthStencilState.maxDepthBounds = 1.0f;

    depthStencilState.stencilTestEnable = StencilTestEnabled(descriptor) ? VK_TRUE : VK_FALSE;

    depthStencilState.front.failOp = VulkanStencilOp(descriptor->stencilFront.failOp);
    depthStencilState.front.passOp = VulkanStencilOp(descriptor->stencilFront.passOp);
    depthStencilState.front.depthFailOp = VulkanStencilOp(descriptor->stencilFront.depthFailOp);
    depthStencilState.front.compareOp = ToVulkanCompareOp(descriptor->stencilFront.compare);

    depthStencilState.back.failOp = VulkanStencilOp(descriptor->stencilBack.failOp);
    depthStencilState.back.passOp = VulkanStencilOp(descriptor->stencilBack.passOp);
    depthStencilState.back.depthFailOp = VulkanStencilOp(descriptor->stencilBack.depthFailOp);
    depthStencilState.back.compareOp = ToVulkanCompareOp(descriptor->stencilBack.compare);

    // Dawn doesn't have separate front and back stencil masks.
    depthStencilState.front.compareMask = descriptor->stencilReadMask;
    depthStencilState.back.compareMask = descriptor->stencilReadMask;
    depthStencilState.front.writeMask = descriptor->stencilWriteMask;
    depthStencilState.back.writeMask = descriptor->stencilWriteMask;

    // The stencil reference is always dynamic
    depthStencilState.front.reference = 0;
    depthStencilState.back.reference = 0;

    return depthStencilState;
}

}  // anonymous namespace

// static
Ref<RenderPipeline> RenderPipeline::CreateUninitialized(
    Device* device,
    const RenderPipelineDescriptor* descriptor) {
    return AcquireRef(new RenderPipeline(device, descriptor));
}

MaybeError RenderPipeline::Initialize() {
    Device* device = ToBackend(GetDevice());
    PipelineLayout* layout = ToBackend(GetLayout());

    // There are at most 2 shader stages in render pipeline, i.e. vertex and fragment
    std::array<VkPipelineShaderStageCreateInfo, 2> shaderStages;
    std::array<std::vector<OverridableConstantScalar>, 2> specializationDataEntriesPerStages;
    std::array<std::vector<VkSpecializationMapEntry>, 2> specializationMapEntriesPerStages;
    std::array<VkSpecializationInfo, 2> specializationInfoPerStages;
    uint32_t stageCount = 0;

    for (auto stage : IterateStages(this->GetStageMask())) {
        VkPipelineShaderStageCreateInfo shaderStage;

        const ProgrammableStage& programmableStage = GetStage(stage);
        ShaderModule* module = ToBackend(programmableStage.module.Get());
        const ShaderModule::Spirv* spirv;
        DAWN_TRY_ASSIGN(std::tie(shaderStage.module, spirv),
                        module->GetHandleAndSpirv(programmableStage.entryPoint.c_str(), layout));

        shaderStage.sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO;
        shaderStage.pNext = nullptr;
        shaderStage.flags = 0;
        shaderStage.pSpecializationInfo = nullptr;
        shaderStage.pName = programmableStage.entryPoint.c_str();

        switch (stage) {
            case dawn::native::SingleShaderStage::Vertex: {
                shaderStage.stage = VK_SHADER_STAGE_VERTEX_BIT;
                break;
            }
            case dawn::native::SingleShaderStage::Fragment: {
                shaderStage.stage = VK_SHADER_STAGE_FRAGMENT_BIT;
                break;
            }
            default: {
                // For render pipeline only Vertex and Fragment stage is possible
                DAWN_UNREACHABLE();
                break;
            }
        }

        shaderStage.pSpecializationInfo =
            GetVkSpecializationInfo(programmableStage, &specializationInfoPerStages[stageCount],
                                    &specializationDataEntriesPerStages[stageCount],
                                    &specializationMapEntriesPerStages[stageCount]);

        DAWN_ASSERT(stageCount < 2);
        shaderStages[stageCount] = shaderStage;
        stageCount++;

        // Record cache key for each shader since it will become inaccessible later on.
        GetCacheKey()->Record(stage).RecordIterable(*spirv);
    }

    PipelineVertexInputStateCreateInfoTemporaryAllocations tempAllocations;
    VkPipelineVertexInputStateCreateInfo vertexInputCreateInfo =
        ComputeVertexInputDesc(&tempAllocations);

    VkPipelineInputAssemblyStateCreateInfo inputAssembly;
    inputAssembly.sType = VK_STRUCTURE_TYPE_PIPELINE_INPUT_ASSEMBLY_STATE_CREATE_INFO;
    inputAssembly.pNext = nullptr;
    inputAssembly.flags = 0;
    inputAssembly.topology = VulkanPrimitiveTopology(GetPrimitiveTopology());
    inputAssembly.primitiveRestartEnable = ShouldEnablePrimitiveRestart(GetPrimitiveTopology());

    // A placeholder viewport/scissor info. The validation layers force use to provide at least
    // one scissor and one viewport here, even if we choose to make them dynamic.
    VkViewport viewportDesc;
    viewportDesc.x = 0.0f;
    viewportDesc.y = 0.0f;
    viewportDesc.width = 1.0f;
    viewportDesc.height = 1.0f;
    viewportDesc.minDepth = 0.0f;
    viewportDesc.maxDepth = 1.0f;
    VkRect2D scissorRect;
    scissorRect.offset.x = 0;
    scissorRect.offset.y = 0;
    scissorRect.extent.width = 1;
    scissorRect.extent.height = 1;
    VkPipelineViewportStateCreateInfo viewport;
    viewport.sType = VK_STRUCTURE_TYPE_PIPELINE_VIEWPORT_STATE_CREATE_INFO;
    viewport.pNext = nullptr;
    viewport.flags = 0;
    viewport.viewportCount = 1;
    viewport.pViewports = &viewportDesc;
    viewport.scissorCount = 1;
    viewport.pScissors = &scissorRect;

    VkPipelineRasterizationStateCreateInfo rasterization;
    rasterization.sType = VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_STATE_CREATE_INFO;
    rasterization.pNext = nullptr;
    rasterization.flags = 0;
    rasterization.depthClampEnable = ShouldClampDepth() ? VK_TRUE : VK_FALSE;
    rasterization.rasterizerDiscardEnable = VK_FALSE;
    rasterization.polygonMode = VK_POLYGON_MODE_FILL;
    rasterization.cullMode = VulkanCullMode(GetCullMode());
    rasterization.frontFace = VulkanFrontFace(GetFrontFace());
    rasterization.depthBiasEnable = IsDepthBiasEnabled();
    rasterization.depthBiasConstantFactor = GetDepthBias();
    rasterization.depthBiasClamp = GetDepthBiasClamp();
    rasterization.depthBiasSlopeFactor = GetDepthBiasSlopeScale();
    rasterization.lineWidth = 1.0f;

    VkPipelineMultisampleStateCreateInfo multisample;
    multisample.sType = VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO;
    multisample.pNext = nullptr;
    multisample.flags = 0;
    multisample.rasterizationSamples = VulkanSampleCount(GetSampleCount());
    multisample.sampleShadingEnable = VK_FALSE;
    multisample.minSampleShading = 0.0f;
    // VkPipelineMultisampleStateCreateInfo.pSampleMask is an array of length
    // ceil(rasterizationSamples / 32) and since we're passing a single uint32_t
    // we have to assert that this length is indeed 1.
    ASSERT(multisample.rasterizationSamples <= 32);
    VkSampleMask sampleMask = GetSampleMask();
    multisample.pSampleMask = &sampleMask;
    multisample.alphaToCoverageEnable = IsAlphaToCoverageEnabled();
    multisample.alphaToOneEnable = VK_FALSE;

    VkPipelineDepthStencilStateCreateInfo depthStencilState =
        ComputeDepthStencilDesc(GetDepthStencilState());

    VkPipelineColorBlendStateCreateInfo colorBlend;
    // colorBlend may hold pointers to elements in colorBlendAttachments, so it must have a
    // definition scope as same as colorBlend
    ityp::array<ColorAttachmentIndex, VkPipelineColorBlendAttachmentState, kMaxColorAttachments>
        colorBlendAttachments;
    if (GetStageMask() & wgpu::ShaderStage::Fragment) {
        // Initialize the "blend state info" that will be chained in the "create info" from the
        // data pre-computed in the ColorState
        for (auto& blend : colorBlendAttachments) {
            blend.blendEnable = VK_FALSE;
            blend.srcColorBlendFactor = VK_BLEND_FACTOR_ONE;
            blend.dstColorBlendFactor = VK_BLEND_FACTOR_ZERO;
            blend.colorBlendOp = VK_BLEND_OP_ADD;
            blend.srcAlphaBlendFactor = VK_BLEND_FACTOR_ONE;
            blend.dstAlphaBlendFactor = VK_BLEND_FACTOR_ZERO;
            blend.alphaBlendOp = VK_BLEND_OP_ADD;
            blend.colorWriteMask = 0;
        }

        const auto& fragmentOutputsWritten =
            GetStage(SingleShaderStage::Fragment).metadata->fragmentOutputsWritten;
        ColorAttachmentIndex highestColorAttachmentIndexPlusOne =
            GetHighestBitIndexPlusOne(GetColorAttachmentsMask());
        for (ColorAttachmentIndex i : IterateBitSet(GetColorAttachmentsMask())) {
            const ColorTargetState* target = GetColorTargetState(i);
            colorBlendAttachments[i] = ComputeColorDesc(target, fragmentOutputsWritten[i]);
        }

        colorBlend.sType = VK_STRUCTURE_TYPE_PIPELINE_COLOR_BLEND_STATE_CREATE_INFO;
        colorBlend.pNext = nullptr;
        colorBlend.flags = 0;
        // LogicOp isn't supported so we disable it.
        colorBlend.logicOpEnable = VK_FALSE;
        colorBlend.logicOp = VK_LOGIC_OP_CLEAR;
        colorBlend.attachmentCount = static_cast<uint8_t>(highestColorAttachmentIndexPlusOne);
        colorBlend.pAttachments = colorBlendAttachments.data();
        // The blend constant is always dynamic so we fill in a placeholder value
        colorBlend.blendConstants[0] = 0.0f;
        colorBlend.blendConstants[1] = 0.0f;
        colorBlend.blendConstants[2] = 0.0f;
        colorBlend.blendConstants[3] = 0.0f;
    }

    // Tag all state as dynamic but stencil masks and depth bias.
    VkDynamicState dynamicStates[] = {
        VK_DYNAMIC_STATE_VIEWPORT,     VK_DYNAMIC_STATE_SCISSOR,
        VK_DYNAMIC_STATE_LINE_WIDTH,   VK_DYNAMIC_STATE_BLEND_CONSTANTS,
        VK_DYNAMIC_STATE_DEPTH_BOUNDS, VK_DYNAMIC_STATE_STENCIL_REFERENCE,
    };
    VkPipelineDynamicStateCreateInfo dynamic;
    dynamic.sType = VK_STRUCTURE_TYPE_PIPELINE_DYNAMIC_STATE_CREATE_INFO;
    dynamic.pNext = nullptr;
    dynamic.flags = 0;
    dynamic.dynamicStateCount = sizeof(dynamicStates) / sizeof(dynamicStates[0]);
    dynamic.pDynamicStates = dynamicStates;

    // Get a VkRenderPass that matches the attachment formats for this pipeline, load/store ops
    // don't matter so set them all to LoadOp::Load / StoreOp::Store. Whether the render pass
    // has resolve target and whether depth/stencil attachment is read-only also don't matter,
    // so set them both to false.
    VkRenderPass renderPass = VK_NULL_HANDLE;
    {
        RenderPassCacheQuery query;

        for (ColorAttachmentIndex i : IterateBitSet(GetColorAttachmentsMask())) {
            query.SetColor(i, GetColorAttachmentFormat(i), wgpu::LoadOp::Load, wgpu::StoreOp::Store,
                           false);
        }

        if (HasDepthStencilAttachment()) {
            query.SetDepthStencil(GetDepthStencilFormat(), wgpu::LoadOp::Load, wgpu::StoreOp::Store,
                                  wgpu::LoadOp::Load, wgpu::StoreOp::Store, false);
        }

        query.SetSampleCount(GetSampleCount());

        GetCacheKey()->Record(query);
        DAWN_TRY_ASSIGN(renderPass, device->GetRenderPassCache()->GetRenderPass(query));
    }

    // The create info chains in a bunch of things created on the stack here or inside state
    // objects.
    VkGraphicsPipelineCreateInfo createInfo;
    createInfo.sType = VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO;
    createInfo.pNext = nullptr;
    createInfo.flags = 0;
    createInfo.stageCount = stageCount;
    createInfo.pStages = shaderStages.data();
    createInfo.pVertexInputState = &vertexInputCreateInfo;
    createInfo.pInputAssemblyState = &inputAssembly;
    createInfo.pTessellationState = nullptr;
    createInfo.pViewportState = &viewport;
    createInfo.pRasterizationState = &rasterization;
    createInfo.pMultisampleState = &multisample;
    createInfo.pDepthStencilState = &depthStencilState;
    createInfo.pColorBlendState =
        (GetStageMask() & wgpu::ShaderStage::Fragment) ? &colorBlend : nullptr;
    createInfo.pDynamicState = &dynamic;
    createInfo.layout = ToBackend(GetLayout())->GetHandle();
    createInfo.renderPass = renderPass;
    createInfo.subpass = 0;
    createInfo.basePipelineHandle = VkPipeline{};
    createInfo.basePipelineIndex = -1;

    // Record cache key information now since createInfo is not stored.
    GetCacheKey()->Record(createInfo,
                          static_cast<const RenderPipeline*>(this)->GetLayout()->GetCacheKey());

    DAWN_TRY(
        CheckVkSuccess(device->fn.CreateGraphicsPipelines(device->GetVkDevice(), VkPipelineCache{},
                                                          1, &createInfo, nullptr, &*mHandle),
                       "CreateGraphicsPipeline"));

    SetLabelImpl();

    return {};
}

void RenderPipeline::SetLabelImpl() {
    SetDebugName(ToBackend(GetDevice()), mHandle, "Dawn_RenderPipeline", GetLabel());
}

VkPipelineVertexInputStateCreateInfo RenderPipeline::ComputeVertexInputDesc(
    PipelineVertexInputStateCreateInfoTemporaryAllocations* tempAllocations) {
    // Fill in the "binding info" that will be chained in the create info
    uint32_t bindingCount = 0;
    for (VertexBufferSlot slot : IterateBitSet(GetVertexBufferSlotsUsed())) {
        const VertexBufferInfo& bindingInfo = GetVertexBuffer(slot);

        VkVertexInputBindingDescription* bindingDesc = &tempAllocations->bindings[bindingCount];
        bindingDesc->binding = static_cast<uint8_t>(slot);
        bindingDesc->stride = bindingInfo.arrayStride;
        bindingDesc->inputRate = VulkanInputRate(bindingInfo.stepMode);

        bindingCount++;
    }

    // Fill in the "attribute info" that will be chained in the create info
    uint32_t attributeCount = 0;
    for (VertexAttributeLocation loc : IterateBitSet(GetAttributeLocationsUsed())) {
        const VertexAttributeInfo& attributeInfo = GetAttribute(loc);

        VkVertexInputAttributeDescription* attributeDesc =
            &tempAllocations->attributes[attributeCount];
        attributeDesc->location = static_cast<uint8_t>(loc);
        attributeDesc->binding = static_cast<uint8_t>(attributeInfo.vertexBufferSlot);
        attributeDesc->format = VulkanVertexFormat(attributeInfo.format);
        attributeDesc->offset = attributeInfo.offset;

        attributeCount++;
    }

    // Build the create info
    VkPipelineVertexInputStateCreateInfo createInfo;
    createInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO;
    createInfo.pNext = nullptr;
    createInfo.flags = 0;
    createInfo.vertexBindingDescriptionCount = bindingCount;
    createInfo.pVertexBindingDescriptions = tempAllocations->bindings.data();
    createInfo.vertexAttributeDescriptionCount = attributeCount;
    createInfo.pVertexAttributeDescriptions = tempAllocations->attributes.data();
    return createInfo;
}

RenderPipeline::~RenderPipeline() = default;

void RenderPipeline::DestroyImpl() {
    RenderPipelineBase::DestroyImpl();
    if (mHandle != VK_NULL_HANDLE) {
        ToBackend(GetDevice())->GetFencedDeleter()->DeleteWhenUnused(mHandle);
        mHandle = VK_NULL_HANDLE;
    }
}

VkPipeline RenderPipeline::GetHandle() const {
    return mHandle;
}

void RenderPipeline::InitializeAsync(Ref<RenderPipelineBase> renderPipeline,
                                     WGPUCreateRenderPipelineAsyncCallback callback,
                                     void* userdata) {
    std::unique_ptr<CreateRenderPipelineAsyncTask> asyncTask =
        std::make_unique<CreateRenderPipelineAsyncTask>(std::move(renderPipeline), callback,
                                                        userdata);
    CreateRenderPipelineAsyncTask::RunAsync(std::move(asyncTask));
}

}  // namespace dawn::native::vulkan