ShaderTextureResourceBindingManager.h

#pragma once
 
// Standard.
#include <memory>
#include <mutex>
#include <unordered_map>
#include <unordered_set>
 
// Custom.
#include "shader/general/resource/binding/ShaderResourceBinding.h"
#include "shader/general/resource/binding/texture/ShaderTextureResourceBindingUniquePtr.h"
 
namespace ne {
    class Renderer;
 
    class ShaderTextureResourceBindingManager {
        // Only renderer should be allowed to create this manager.
        friend class Renderer;
 
        // Unique pointers will notify the manager before destruction.
        friend class ShaderTextureResourceBindingUniquePtr;
 
    public:
        ShaderTextureResourceBindingManager() = delete;
 
        ShaderTextureResourceBindingManager(const ShaderTextureResourceBindingManager&) = delete;
        ShaderTextureResourceBindingManager& operator=(const ShaderTextureResourceBindingManager&) = delete;
 
        ~ShaderTextureResourceBindingManager();
 
        std::variant<ShaderTextureResourceBindingUniquePtr, Error> createShaderTextureResource(
            const std::string& sShaderResourceName,
            const std::string& sResourceAdditionalInfo,
            const std::unordered_set<Pipeline*>& pipelinesToUse,
            std::unique_ptr<TextureHandle> pTextureToUse);
 
        std::pair<
            std::recursive_mutex,
            std::unordered_map<ShaderTextureResourceBinding*, std::unique_ptr<ShaderTextureResourceBinding>>>*
        getResources();
 
    private:
        ShaderTextureResourceBindingManager(Renderer* pRenderer);
 
        std::variant<ShaderTextureResourceBindingUniquePtr, Error>
        handleResourceCreation(std::variant<std::unique_ptr<ShaderTextureResourceBinding>, Error> result);
 
        void destroyResource(ShaderTextureResourceBinding* pResourceToDestroy);
 
        Renderer* pRenderer = nullptr;
 
        std::pair<
            std::recursive_mutex,
            std::unordered_map<ShaderTextureResourceBinding*, std::unique_ptr<ShaderTextureResourceBinding>>>
            mtxShaderTextureResources;
    };
} // namespace ne