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) 2000-2005 The OGRE Team
Also see acknowledgements in Readme.html

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.
-----------------------------------------------------------------------------
*/
#ifndef __GLPIXELBUFFER_H__
#define __GLPIXELBUFFER_H__

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

namespace Ogre {
    class 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
        
        // Buffer allocation/freeage
        void allocateBuffer();
        void freeBuffer();
        // Upload a box of pixels to this buffer on the card
        virtual void upload(const PixelBox &data);
        // 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 GLTextureBuffer: public GLHardwarePixelBuffer
    {
    public:
        GLTextureBuffer(const String &baseName, GLenum target, GLuint id, GLint face, GLint level, Usage usage, 
            bool softwareMipmap);
        ~GLTextureBuffer();
        
        virtual void bindToFramebuffer(GLenum attachment, size_t zoffset);
        RenderTexture* getRenderTarget(size_t);
        // Upload a box of pixels to this buffer on the card
        virtual void upload(const PixelBox &data);
        // Download a box of pixels from the card
        virtual void download(const PixelBox &data);
  
        // Hardware implementation of blitFromMemory
        virtual void blitFromMemory(const PixelBox &src_orig, const Image::Box &dstBox);
        
        // Notify TextureBuffer of destruction of render target
        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(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
        
        typedef std::vector<RenderTexture*> SliceTRT;
        SliceTRT mSliceTRT;
    };
    class GLRenderBuffer: public GLHardwarePixelBuffer
    {
    public:
        GLRenderBuffer(GLenum format, size_t width, size_t height);
        ~GLRenderBuffer();
        
        virtual void bindToFramebuffer(GLenum attachment, size_t zoffset);
    protected:
        // In case this is a  render buffer
        GLuint mRenderbufferID;
    };
};

#endif

---

Copyright © 2000-2005 by The OGRE Team

This work is licensed under a Creative Commons Attribution-ShareAlike 2.5 License.
Last modified Sun Mar 12 14:37:41 2006