axmol/cocos/renderer/backend/ShaderCache.cpp

/****************************************************************************
 Copyright (c) 2018 Xiamen Yaji Software Co., Ltd.

 http://www.cocos2d-x.org

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 of this software and associated documentation files (the "Software"), to deal
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 all copies or substantial portions of the Software.

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 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 THE SOFTWARE.
 ****************************************************************************/

#include "ShaderCache.h"
#include "renderer/backend/Device.h"

CC_BACKEND_BEGIN

std::unordered_map<std::size_t, backend::ShaderModule*> ShaderCache::_cachedShaders;
ShaderCache* ShaderCache::_sharedShaderCache = nullptr;

ShaderCache* ShaderCache::getInstance()
{
    if (!_sharedShaderCache)
    {
        _sharedShaderCache = new ShaderCache();
        if (!_sharedShaderCache->init())
        {
            CC_SAFE_DELETE(_sharedShaderCache);
        }
    }
    return _sharedShaderCache;
}

void ShaderCache::destroyInstance()
{
    CC_SAFE_RELEASE_NULL(_sharedShaderCache);
}

ShaderCache::~ShaderCache()
{
    for (auto& shaderModule : _cachedShaders)
    {
        CC_SAFE_RELEASE(shaderModule.second);
    }
    CCLOGINFO("deallocing ProgramCache: %p", this);
}

bool ShaderCache::init()
{
    return true;
}

backend::ShaderModule* ShaderCache::newVertexShaderModule(std::string_view shaderSource)
{
    auto vertexShaderModule = newShaderModule(backend::ShaderStage::VERTEX, shaderSource);
    return vertexShaderModule;
}

backend::ShaderModule* ShaderCache::newFragmentShaderModule(std::string_view shaderSource)
{
    auto fragmenShaderModule = newShaderModule(backend::ShaderStage::FRAGMENT, shaderSource);
    return fragmenShaderModule;
}

backend::ShaderModule* ShaderCache::newShaderModule(backend::ShaderStage stage, std::string_view shaderSource)
{
    std::size_t key = std::hash<std::string_view>{}(shaderSource);
    auto iter       = _cachedShaders.find(key);
    if (_cachedShaders.end() != iter)
        return iter->second;

    auto shader = backend::Device::getInstance()->newShaderModule(stage, shaderSource);
    shader->setHashValue(key);
    _cachedShaders.emplace(key, shader);

    return shader;
}

void ShaderCache::removeUnusedShader()
{
    for (auto iter = _cachedShaders.cbegin(); iter != _cachedShaders.cend();)
    {
        auto shaderModule = iter->second;
        if (shaderModule->getReferenceCount() == 1)
        {
            //            CCLOG("cocos2d: TextureCache: removing unused program");
            shaderModule->release();
            iter = _cachedShaders.erase(iter);
        }
        else
        {
            ++iter;
        }
    }
}

CC_BACKEND_END