OgreGLES2HardwarePixelBuffer.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 __GLES2HardwarePixelBuffer_H__
#define __GLES2HardwarePixelBuffer_H__

#include "OgreGLES2Prerequisites.h"
#include "OgreHardwarePixelBuffer.h"

namespace Ogre {
    class _OgreGLES2Export GLES2HardwarePixelBuffer: 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();

            // Upload a box of pixels to this buffer on the card
            virtual void upload(const PixelBox &data, const Image::Box &dest);

            // Download a box of pixels from the card
            virtual void download(const PixelBox &data);
        
        public:
            GLES2HardwarePixelBuffer(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);

            virtual ~GLES2HardwarePixelBuffer();

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

    class _OgreGLES2Export GLES2TextureBuffer: public GLES2HardwarePixelBuffer
            {
        public:
            GLES2TextureBuffer(const String &baseName, GLenum target, GLuint id, GLint width, GLint height, GLint depth, GLint internalFormat,
                               GLint format, GLint face, GLint level, Usage usage, bool softwareMipmap, bool writeGamma, uint fsaa);
            virtual ~GLES2TextureBuffer();

            virtual void bindToFramebuffer(GLenum attachment, size_t zoffset);

            RenderTexture* getRenderTarget(size_t slice);

            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;
            }

            // Copy from framebuffer
            void copyFromFramebuffer(size_t zoffset);

            void blit(const HardwarePixelBufferSharedPtr &src, const Image::Box &srcBox, const Image::Box &dstBox);
            // Blitting implementation
            void blitFromTexture(GLES2TextureBuffer *src, const Image::Box &srcBox, const Image::Box &dstBox);
            
#if OGRE_PLATFORM == OGRE_PLATFORM_ANDROID
        // Friends.
        protected:
            friend class GLES2Texture;
                
            void updateTextureId(GLuint textureID);
#endif
                
        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;
            bool mSoftwareMipmap;
                
            typedef vector<RenderTexture*>::type SliceTRT;
            SliceTRT mSliceTRT;

            void buildMipmaps(const PixelBox &data);
    };

    class _OgreGLES2Export GLES2RenderBuffer: public GLES2HardwarePixelBuffer
    {
        public:
            GLES2RenderBuffer(GLenum format, uint32 width, uint32 height, GLsizei numSamples);
            virtual ~GLES2RenderBuffer();

            virtual void bindToFramebuffer(GLenum attachment, size_t zoffset);

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

#endif