OgreGLHardwarePixelBuffer.h

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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) 2000-2013 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-----------------------------------------------------------------------------
*/
#ifndef __GLPIXELBUFFER_H__
#define __GLPIXELBUFFER_H__

#include "OgreGLPrerequisites.h"
#include "OgreHardwarePixelBuffer.h"

namespace Ogre {
    class _OgreGLExport GLHardwarePixelBuffer: 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:
        GLHardwarePixelBuffer(size_t mWidth, size_t mHeight, size_t mDepth,
                PixelFormat mFormat,
                HardwareBuffer::Usage usage);
        
        void blitFromMemory(const PixelBox &src, const Image::Box &dstBox);
        
        void blitToMemory(const Image::Box &srcBox, const PixelBox &dst);
        
        ~GLHardwarePixelBuffer();
        
        virtual void bindToFramebuffer(GLenum attachment, size_t zoffset);
        GLenum getGLFormat() { return mGLInternalFormat; }
    };

    class _OgreGLExport GLTextureBuffer: public GLHardwarePixelBuffer
    {
    public:
        GLTextureBuffer(const String &baseName, GLenum target, GLuint id, GLint face, 
            GLint level, Usage usage, bool softwareMipmap, bool writeGamma, uint fsaa);
        ~GLTextureBuffer();
        
        virtual void bindToFramebuffer(GLenum attachment, size_t 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(size_t zoffset);
        void blit(const HardwarePixelBufferSharedPtr &src, const Image::Box &srcBox, const Image::Box &dstBox);
        // Blitting implementation
        void blitFromTexture(GLTextureBuffer *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;
        GLint mFace;
        GLint mLevel;
        bool mSoftwareMipmap;       // Use GLU for mip mapping
        bool mHwGamma;
        
        typedef vector<RenderTexture*>::type SliceTRT;
        SliceTRT mSliceTRT;
    };
    class _OgreGLExport GLRenderBuffer: public GLHardwarePixelBuffer
    {
    public:
        GLRenderBuffer(GLenum format, size_t width, size_t height, GLsizei numSamples);
        ~GLRenderBuffer();
        
        virtual void bindToFramebuffer(GLenum attachment, size_t zoffset);
    protected:
        // In case this is a render buffer
        GLuint mRenderbufferID;
    };
}

#endif