// 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/ComputePipelineVk.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/PipelineCacheVk.h"
#include "dawn/native/vulkan/PipelineLayoutVk.h"
#include "dawn/native/vulkan/ShaderModuleVk.h"
#include "dawn/native/vulkan/UtilsVulkan.h"
#include "dawn/native/vulkan/VulkanError.h"

namespace dawn::native::vulkan {

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

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

    // Vulkan devices need cache UUID field to be serialized into pipeline cache keys.
    mCacheKey.Record(device->GetDeviceInfo().properties.pipelineCacheUUID);

    VkComputePipelineCreateInfo createInfo;
    createInfo.sType = VK_STRUCTURE_TYPE_COMPUTE_PIPELINE_CREATE_INFO;
    createInfo.pNext = nullptr;
    createInfo.flags = 0;
    createInfo.layout = layout->GetHandle();
    createInfo.basePipelineHandle = VkPipeline{};
    createInfo.basePipelineIndex = -1;

    createInfo.stage.sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO;
    createInfo.stage.pNext = nullptr;
    createInfo.stage.flags = 0;
    createInfo.stage.stage = VK_SHADER_STAGE_COMPUTE_BIT;
    // Generate a new VkShaderModule with BindingRemapper tint transform for each pipeline
    const ProgrammableStage& computeStage = GetStage(SingleShaderStage::Compute);
    ShaderModule* module = ToBackend(computeStage.module.Get());
    const ShaderModule::Spirv* spirv;
    DAWN_TRY_ASSIGN((std::tie(createInfo.stage.module, spirv)),
                    module->GetHandleAndSpirv(computeStage.entryPoint.c_str(), layout));

    createInfo.stage.pName = computeStage.entryPoint.c_str();

    std::vector<OverridableConstantScalar> specializationDataEntries;
    std::vector<VkSpecializationMapEntry> specializationMapEntries;
    VkSpecializationInfo specializationInfo{};
    createInfo.stage.pSpecializationInfo = GetVkSpecializationInfo(
        computeStage, &specializationInfo, &specializationDataEntries, &specializationMapEntries);

    PNextChainBuilder stageExtChain(&createInfo.stage);

    VkPipelineShaderStageRequiredSubgroupSizeCreateInfoEXT subgroupSizeInfo = {};
    uint32_t computeSubgroupSize = device->GetComputeSubgroupSize();
    if (computeSubgroupSize != 0u) {
        ASSERT(device->GetDeviceInfo().HasExt(DeviceExt::SubgroupSizeControl));
        subgroupSizeInfo.requiredSubgroupSize = computeSubgroupSize;
        stageExtChain.Add(
            &subgroupSizeInfo,
            VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_REQUIRED_SUBGROUP_SIZE_CREATE_INFO_EXT);
    }

    // Record cache key information now since the createInfo is not stored.
    mCacheKey.Record(createInfo, layout).RecordIterable(*spirv);

    // Try to see if we have anything in the blob cache.
    Ref<PipelineCache> cache = ToBackend(GetDevice()->GetOrCreatePipelineCache(GetCacheKey()));
    DAWN_TRY(
        CheckVkSuccess(device->fn.CreateComputePipelines(device->GetVkDevice(), cache->GetHandle(),
                                                         1, &createInfo, nullptr, &*mHandle),
                       "CreateComputePipeline"));
    // TODO(dawn:549): Flush is currently in the same thread, but perhaps deferrable.
    DAWN_TRY(cache->FlushIfNeeded());

    SetLabelImpl();

    return {};
}

void ComputePipeline::SetLabelImpl() {
    SetDebugName(ToBackend(GetDevice()), mHandle, "Dawn_ComputePipeline", GetLabel());
}

ComputePipeline::~ComputePipeline() = default;

void ComputePipeline::DestroyImpl() {
    ComputePipelineBase::DestroyImpl();

    if (mHandle != VK_NULL_HANDLE) {
        ToBackend(GetDevice())->GetFencedDeleter()->DeleteWhenUnused(mHandle);
        mHandle = VK_NULL_HANDLE;
    }
}

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

void ComputePipeline::InitializeAsync(Ref<ComputePipelineBase> computePipeline,
                                      WGPUCreateComputePipelineAsyncCallback callback,
                                      void* userdata) {
    std::unique_ptr<CreateComputePipelineAsyncTask> asyncTask =
        std::make_unique<CreateComputePipelineAsyncTask>(std::move(computePipeline), callback,
                                                         userdata);
    CreateComputePipelineAsyncTask::RunAsync(std::move(asyncTask));
}

}  // namespace dawn::native::vulkan