OgreGL3PlusHardwarePixelBuffer.h

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/*
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This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2014 Torus Knot Software Ltd

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*/

#ifndef __GL3PlusHardwarePixelBuffer_H__
#define __GL3PlusHardwarePixelBuffer_H__

#include "OgreGL3PlusPrerequisites.h"
#include "OgreHardwarePixelBuffer.h"

namespace Ogre {
    class _OgreGL3PlusExport GL3PlusHardwarePixelBuffer: public HardwarePixelBuffer
    {
        protected:
            PixelBox lockImpl(const Image::Box lockBox,  LockOptions options);

            void unlockImpl(void);

            // Internal buffer; either on-card or in system memory, freed/allocated on demand
            // depending on buffer usage
            PixelBox mBuffer;
            GLenum mGLInternalFormat; // GL internal format
            LockOptions mCurrentLockOptions;

            // Buffer allocation/freeage
            void allocateBuffer();

            void freeBuffer();

            virtual void upload(const PixelBox &data, const Image::Box &dest);

            virtual void download(const PixelBox &data);

        public:
            GL3PlusHardwarePixelBuffer(uint32 mWidth, uint32 mHeight, uint32 mDepth,
                                  PixelFormat mFormat,
                                  HardwareBuffer::Usage usage);

            void blitFromMemory(const PixelBox &src, const Image::Box &dstBox);

            void blitToMemory(const Image::Box &srcBox, const PixelBox &dst);

            ~GL3PlusHardwarePixelBuffer();

            virtual void bindToFramebuffer(GLenum attachment, uint32 zoffset);
            GLenum getGLFormat() { return mGLInternalFormat; }
    };

    class _OgreGL3PlusExport GL3PlusTextureBuffer: public GL3PlusHardwarePixelBuffer
            {
        public:
            GL3PlusTextureBuffer(const String &baseName, GLenum target, GLuint id, GLint face, 
                             GLint level, Usage usage, bool writeGamma, uint fsaa);
            ~GL3PlusTextureBuffer();

            virtual void bindToFramebuffer(GLenum attachment, uint32 zoffset);

            RenderTexture* getRenderTarget(size_t);

            virtual void upload(const PixelBox &data, const Image::Box &dest);

            virtual void download(const PixelBox &data);

            virtual void blitFromMemory(const PixelBox &src_orig, const Image::Box &dstBox);

            void _clearSliceRTT(size_t zoffset)
            {
                mSliceTRT[zoffset] = 0;
            }

            void copyFromFramebuffer(uint32 zoffset);

            void blit(const HardwarePixelBufferSharedPtr &src, const Image::Box &srcBox, const Image::Box &dstBox);
            // Blitting implementation
            void blitFromTexture(GL3PlusTextureBuffer *src, const Image::Box &srcBox, const Image::Box &dstBox);
        protected:
            // In case this is a texture level
            GLenum mTarget;
            GLenum mFaceTarget; // same as mTarget in case of GL_TEXTURE_xD, but cubemap face for cubemaps
            GLuint mTextureID;
            GLuint mBufferId;
            GLint mFace;
            GLint mLevel;

            typedef vector<RenderTexture*>::type SliceTRT;
            SliceTRT mSliceTRT;
    };

    class _OgreGL3PlusExport GL3PlusRenderBuffer: public GL3PlusHardwarePixelBuffer
    {
        public:
            GL3PlusRenderBuffer(GLenum format, uint32 width, uint32 height, GLsizei numSamples);
            ~GL3PlusRenderBuffer();

            virtual void bindToFramebuffer(GLenum attachment, uint32 zoffset);

        protected:
            // In case this is a render buffer
            GLuint mRenderbufferID;
    };
}

#endif