OgreGLFBORenderTexture.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 __OgreGLFBORTT_H__
#define __OgreGLFBORTT_H__

#include "OgreGLRenderTexture.h"
#include "OgreGLContext.h"
#include "OgreGLFrameBufferObject.h"

#define GL_DEPTH24_STENCIL8_EXT                           0x88F0


namespace Ogre {
    class GLFBOManager;

    class _OgreGLExport GLFBORenderTexture: public GLRenderTexture
    {
    public:
        GLFBORenderTexture(GLFBOManager *manager, const String &name, const GLSurfaceDesc &target, bool writeGamma, uint fsaa);

        virtual void getCustomAttribute(const String& name, void* pData);

        virtual void swapBuffers();

        virtual bool attachDepthBuffer( DepthBuffer *depthBuffer );
        virtual void detachDepthBuffer();
        virtual void _detachDepthBuffer();
    protected:
        GLFrameBufferObject mFB;
    };
    
    class _OgreGLExport GLFBOManager: public GLRTTManager
    {
    public:
        GLFBOManager(bool atimode);
        ~GLFBOManager();
        
        void bind(RenderTarget *target);
        
        void unbind(RenderTarget *target) {};
        
        void getBestDepthStencil(GLenum internalFormat, GLenum *depthFormat, GLenum *stencilFormat);
        
        virtual GLFBORenderTexture *createRenderTexture(const String &name, 
            const GLSurfaceDesc &target, bool writeGamma, uint fsaa);

        virtual MultiRenderTarget* createMultiRenderTarget(const String & name);
        
        GLSurfaceDesc requestRenderBuffer(GLenum format, uint32 width, uint32 height, uint fsaa);
        void requestRenderBuffer(const GLSurfaceDesc &surface);
        void releaseRenderBuffer(const GLSurfaceDesc &surface);
        
        bool checkFormat(PixelFormat format) { return mProps[format].valid; }
        
        GLuint getTemporaryFBO() { return mTempFBO; }
    private:
        struct FormatProperties
        {
            bool valid; // This format can be used as RTT (FBO)
            
            struct Mode
            {
                size_t depth;     // Depth format (0=no depth)
                size_t stencil;   // Stencil format (0=no stencil)
            };
            
            vector<Mode>::type modes;
        };
        FormatProperties mProps[PF_COUNT];
        
        struct RBFormat
        {
            RBFormat(GLenum inFormat, size_t inWidth, size_t inHeight, uint fsaa):
                format(inFormat), width(inWidth), height(inHeight), samples(fsaa)
            {}
            RBFormat() {}
            GLenum format;
            size_t width;
            size_t height;
            uint samples;
            // Overloaded comparison operator for usage in map
            bool operator < (const RBFormat &other) const
            {
                if(format < other.format)
                {
                    return true;
                }
                else if(format == other.format)
                {
                    if(width < other.width)
                    {
                        return true;
                    }
                    else if(width == other.width)
                    {
                        if(height < other.height)
                            return true;
                        else if (height == other.height)
                        {
                            if (samples < other.samples)
                                return true;
                        }
                    }
                }
                return false;
            }
        };
        struct RBRef
        {
            RBRef(){}
            RBRef(GLRenderBuffer *inBuffer):
                buffer(inBuffer), refcount(1)
            { }
            GLRenderBuffer *buffer;
            size_t refcount;
        };
        typedef map<RBFormat, RBRef>::type RenderBufferMap;
        RenderBufferMap mRenderBufferMap;
        // map(format, sizex, sizey) -> [GLSurface*,refcount]
        
        GLuint mTempFBO;
        
        bool mATIMode;
        
        void detectFBOFormats();
        GLuint _tryFormat(GLenum depthFormat, GLenum stencilFormat);
        bool _tryPackedFormat(GLenum packedFormat);
        void _createTempFramebuffer(GLuint fmt, GLuint &fb, GLuint &tid);
    };
    

}

#endif