tb_texture_manager.h

#ifndef _TurtleBraines_TextureManager_h_
#define _TurtleBraines_TextureManager_h_

#include "../core/tb_noncopyable.h"
#include "../core/tb_string.h"
#include "../core/tb_types.h"

#include <cstddef>

namespace tbImplementation { class TextureManagerCreator; }

namespace TurtleBrains
{
    namespace Graphics
    {

        typedef float TexelSpace;

        typedef tbCore::uint16 PixelSpace;

        typedef tbCore::uint32 TextureHandle;

        extern const TextureHandle kInvalidTexture;

        extern const TextureHandle& kBlankTexture;

        class TextureManager : public tbCore::Noncopyable
        {
        public:
            void Initialize(void);

            TextureHandle CreateTextureFromFile(const tbCore::tbString& filename);

            TextureHandle CreateTextureFromFileData(const unsigned char* fileDataInMemory, const size_t& fileSizeInBytes);

            TextureHandle CreateTextureFromPixelData(const unsigned char* pixelData, const PixelSpace& textureWidth, const PixelSpace& textureHeight);

            TextureHandle CreateTextureEmpty(const PixelSpace& textureWidth, const PixelSpace& textureHeight);

            TextureHandle CreateTextureReference(const TextureHandle& textureHandle);

            void DestroyTexture(const TextureHandle& textureHandle);

            void BindTexture(const TextureHandle& textureHandle);

            void BindTexture(const TextureHandle& textureHandle, tbCore::uint8 textureUnit);

            PixelSpace GetTextureWidth(const TextureHandle& textureHandle) const;

            PixelSpace GetTextureHeight(const TextureHandle& textureHandle) const;

            tbCore::uint64 ComputeMemoryUsage(void) const;

        private:
            TextureManager(void);

            ~TextureManager(void);

            friend class tbImplementation::TextureManagerCreator;
            TextureHandle mBoundTexture;
        };
        
        extern TextureManager& theTextureManager;

    }; /* namespace Graphics */
}; /* namespace TurtleBrains */

namespace tbGraphics = TurtleBrains::Graphics;

#endif /* _TurtleBraines_TextureManager_h_ */