// Copyright 2022 The Dawn & Tint Authors
//
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#include "src/dawn/native/vulkan/PipelineCacheVk.h"

#include <memory>
#include <utility>

#include "src/dawn/native/Device.h"
#include "src/dawn/native/Error.h"
#include "src/dawn/native/Toggles.h"
#include "src/dawn/native/vulkan/DeviceVk.h"
#include "src/dawn/native/vulkan/FencedDeleter.h"
#include "src/dawn/native/vulkan/VulkanError.h"

namespace dawn::native::vulkan {

// static
Ref<PipelineCache> PipelineCache::Create(Device* device, const CacheKey& key) {
    Ref<PipelineCache> cache =
        AcquireRef(new PipelineCache(device, key, /*isMonolithicCache=*/false));
    cache->Initialize();
    return cache;
}

// static
Ref<PipelineCache> PipelineCache::CreateMonolithic(Device* device, const CacheKey& key) {
    Ref<PipelineCache> cache =
        AcquireRef(new PipelineCache(device, key, /*isMonolithicCache=*/true));
    cache->Initialize();
    return cache;
}

PipelineCache::PipelineCache(Device* device, const CacheKey& key, bool isMonolithicCache)
    : PipelineCacheBase(device->GetBlobCache(), key, isMonolithicCache),
      mDevice(device),
      mInvalidResultWorkaround(
          device->IsToggleEnabled(Toggle::VulkanIncompletePipelineCacheWorkaround)) {}

PipelineCache::~PipelineCache() {
    if (mHandle == VK_NULL_HANDLE) {
        return;
    }
    mDevice->fn.DestroyPipelineCache(mDevice->GetVkDevice(), mHandle, nullptr);
    mHandle = VK_NULL_HANDLE;
}

VkPipelineCache PipelineCache::GetHandle() const {
    return mHandle;
}

MaybeError PipelineCache::SerializeToBlobImpl(Blob* blob) {
    if (mHandle == VK_NULL_HANDLE) {
        // Pipeline cache isn't created successfully
        return {};
    }

    if (mSkipSerialize) {
        return {};
    }

    size_t bufferSize;
    DAWN_TRY(CheckVkSuccess(
        mDevice->fn.GetPipelineCacheData(mDevice->GetVkDevice(), mHandle, &bufferSize, nullptr),
        "GetPipelineCacheData"));

    if (bufferSize == 0 || bufferSize == mStoredDataSize) {
        // If current VkPipelineCache data size is same as `mStoredDataSize` assume nothing has
        // changed vs what is stored in the BlobCache.
        return {};
    }
    *blob = Blob::Create(bufferSize);
    auto result = mDevice->fn.GetPipelineCacheData(mDevice->GetVkDevice(), mHandle, &bufferSize,
                                                   blob->DataPtr());

    if (result == VK_INCOMPLETE && mInvalidResultWorkaround) {
        // Most of the time VK_INCOMPLETE is returned on Pixel 10 is due to a driver bug. The
        // serialized data both returned here and cached in the driver is likely corrupted. Don't
        // store it to the blob cache and don't call vkGetPipelineCacheData() since it will return
        // corrupted data in future calls.
        mSkipSerialize = true;
        *blob = {};
        return {};
    }

    DAWN_TRY(CheckVkSuccess(result, "GetPipelineCacheData"));

    if (bufferSize < blob->Size()) {
        // vkGetPipelineCacheData() returned less data than expected. Shrink the blob so
        // uninitialized data isn't stored in cache.
        *blob = Blob::Create(std::move(*blob), 0, bufferSize);
    }

    mStoredDataSize = bufferSize;

    return {};
}

void PipelineCache::Initialize() {
    Blob blob = PipelineCacheBase::Initialize();

    VkPipelineCacheCreateInfo createInfo;
    createInfo.flags = 0;
    createInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_CACHE_CREATE_INFO;
    createInfo.pNext = nullptr;
    createInfo.initialDataSize = blob.Size();
    createInfo.pInitialData = blob.DataPtr();

    mHandle = VK_NULL_HANDLE;

    // Attempts to create the pipeline cache but does not bubble the error, instead only logging.
    // This should be fine because the handle will be left as null and pipeline creation should
    // continue as if there was no cache.
    MaybeError maybeError = CheckVkSuccess(
        mDevice->fn.CreatePipelineCache(mDevice->GetVkDevice(), &createInfo, nullptr, &*mHandle),
        "CreatePipelineCache");
    if (maybeError.IsError()) {
        std::unique_ptr<ErrorData> error = maybeError.AcquireError();
        mDevice->EmitLog(wgpu::LoggingType::Info, error->GetFormattedMessage().c_str());
        return;
    }

    mStoredDataSize = blob.Size();
}

}  // namespace dawn::native::vulkan