OgreGLESFBORenderTexture.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) 2000-2011 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 __OgreGLESFBORTT_H__
#define __OgreGLESFBORTT_H__

#include "OgreGLESRenderTexture.h"
#include "OgreGLESContext.h"
#include "OgreGLESFrameBufferObject.h"

namespace Ogre {
    class GLESFBOManager;
    class GLESRenderBuffer;

    class _OgreGLESExport GLESFBORenderTexture: public GLESRenderTexture
    {
    public:
        GLESFBORenderTexture(GLESFBOManager *manager, const String &name, const GLESSurfaceDesc &target, bool writeGamma, uint fsaa);

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

        virtual void swapBuffers(bool waitForVSync = true);
    protected:
        GLESFrameBufferObject mFB;
    };
    
    class _OgreGLESExport GLESFBOManager: public GLESRTTManager
    {
    public:
        GLESFBOManager();
        ~GLESFBOManager();
        
        void bind(RenderTarget *target);
        
        void unbind(RenderTarget *target) {};
        
        void getBestDepthStencil(GLenum internalFormat, GLenum *depthFormat, GLenum *stencilFormat);
        
        virtual GLESFBORenderTexture *createRenderTexture(const String &name, 
            const GLESSurfaceDesc &target, bool writeGamma, uint fsaa);

        virtual MultiRenderTarget* createMultiRenderTarget(const String & name);
        
        GLESSurfaceDesc requestRenderBuffer(GLenum format, size_t width, size_t height, uint fsaa);
        void requestRenderBuffer(const GLESSurfaceDesc &surface);
        void releaseRenderBuffer(const GLESSurfaceDesc &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 format, size_t width, size_t height, uint fsaa):
                format(format), width(width), height(height), samples(fsaa)
            {}
            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(GLESRenderBuffer *buffer):
                buffer(buffer), refcount(1)
            { }
            GLESRenderBuffer *buffer;
            size_t refcount;
        };
        typedef map<RBFormat, RBRef>::type RenderBufferMap;
        RenderBufferMap mRenderBufferMap;
        // map(format, sizex, sizey) -> [GLSurface*,refcount]
        
        GLuint mTempFBO;
        
        void detectFBOFormats();
        GLuint _tryFormat(GLenum depthFormat, GLenum stencilFormat);
        bool _tryPackedFormat(GLenum packedFormat);
    };
}

#endif