// Copyright 2019 The SwiftShader Authors. All Rights Reserved.
//
// 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 "VkPipelineCache.hpp"
#include <cstring>

namespace vk {

PipelineCache::SpirvShaderKey::SpirvShaderKey(const VkShaderStageFlagBits pipelineStage,
                                              const std::string &entryPointName,
                                              const std::vector<uint32_t> &insns,
                                              const vk::RenderPass *renderPass,
                                              const uint32_t subpassIndex,
                                              const vk::SpecializationInfo &specializationInfo)
    : pipelineStage(pipelineStage)
    , entryPointName(entryPointName)
    , insns(insns)
    , renderPass(renderPass)
    , subpassIndex(subpassIndex)
    , specializationInfo(specializationInfo)
{
}

bool PipelineCache::SpirvShaderKey::operator<(const SpirvShaderKey &other) const
{
	if(pipelineStage != other.pipelineStage)
	{
		return pipelineStage < other.pipelineStage;
	}

	if(renderPass != other.renderPass)
	{
		return renderPass < other.renderPass;
	}

	if(subpassIndex != other.subpassIndex)
	{
		return subpassIndex < other.subpassIndex;
	}

	if(insns.size() != other.insns.size())
	{
		return insns.size() < other.insns.size();
	}

	if(entryPointName.size() != other.entryPointName.size())
	{
		return entryPointName.size() < other.entryPointName.size();
	}

	int cmp = memcmp(entryPointName.c_str(), other.entryPointName.c_str(), entryPointName.size());
	if(cmp != 0)
	{
		return cmp < 0;
	}

	cmp = memcmp(insns.data(), other.insns.data(), insns.size() * sizeof(uint32_t));
	if(cmp != 0)
	{
		return cmp < 0;
	}

	return (specializationInfo < other.specializationInfo);
}

PipelineCache::PipelineCache(const VkPipelineCacheCreateInfo *pCreateInfo, void *mem)
    : dataSize(ComputeRequiredAllocationSize(pCreateInfo))
    , data(reinterpret_cast<uint8_t *>(mem))
{
	CacheHeader *header = reinterpret_cast<CacheHeader *>(mem);
	header->headerLength = sizeof(CacheHeader);
	header->headerVersion = VK_PIPELINE_CACHE_HEADER_VERSION_ONE;
	header->vendorID = VENDOR_ID;
	header->deviceID = DEVICE_ID;
	memcpy(header->pipelineCacheUUID, SWIFTSHADER_UUID, VK_UUID_SIZE);

	if(pCreateInfo->pInitialData && (pCreateInfo->initialDataSize > 0))
	{
		memcpy(data + sizeof(CacheHeader), pCreateInfo->pInitialData, pCreateInfo->initialDataSize);
	}
}

PipelineCache::~PipelineCache()
{
	spirvShaders.clear();
	computePrograms.clear();
}

void PipelineCache::destroy(const VkAllocationCallbacks *pAllocator)
{
	vk::deallocate(data, pAllocator);
}

size_t PipelineCache::ComputeRequiredAllocationSize(const VkPipelineCacheCreateInfo *pCreateInfo)
{
	return pCreateInfo->initialDataSize + sizeof(CacheHeader);
}

VkResult PipelineCache::getData(size_t *pDataSize, void *pData)
{
	if(!pData)
	{
		*pDataSize = dataSize;
		return VK_SUCCESS;
	}

	if(*pDataSize != dataSize)
	{
		*pDataSize = 0;
		return VK_INCOMPLETE;
	}

	if(*pDataSize > 0)
	{
		memcpy(pData, data, *pDataSize);
	}

	return VK_SUCCESS;
}

VkResult PipelineCache::merge(uint32_t srcCacheCount, const VkPipelineCache *pSrcCaches)
{
	for(uint32_t i = 0; i < srcCacheCount; i++)
	{
		PipelineCache *srcCache = Cast(pSrcCaches[i]);

		{
			marl::lock thisLock(spirvShadersMutex);
			marl::lock srcLock(srcCache->spirvShadersMutex);
			spirvShaders.insert(srcCache->spirvShaders.begin(), srcCache->spirvShaders.end());
		}

		{
			marl::lock thisLock(computeProgramsMutex);
			marl::lock srcLock(srcCache->computeProgramsMutex);
			computePrograms.insert(srcCache->computePrograms.begin(), srcCache->computePrograms.end());
		}
	}

	return VK_SUCCESS;
}

}  // namespace vk