text: /*
  -----------------------------------------------------------------------------
  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 __GLRENDERTEXTURE_H__
  #define __GLRENDERTEXTURE_H__
  
  #include "OgreGLTexture.h"
  
  namespace Ogre {
      /** GL surface descriptor. Points to a 2D surface that can be rendered to. 
      */
      struct _OgrePrivate GLSurfaceDesc
      {
      public:
          GLHardwarePixelBuffer *buffer;
          size_t zoffset;
  		uint numSamples;
  
  		GLSurfaceDesc() :buffer(0), zoffset(0), numSamples(0) {}
      };
      
      /** Base class for GL Render Textures
      */
      class _OgreGLExport GLRenderTexture: public RenderTexture
      {
      public:
          GLRenderTexture(const String &name, const GLSurfaceDesc &target, bool writeGamma, uint fsaa);
          virtual ~GLRenderTexture();
          
          bool requiresTextureFlipping() const { return true; }
      };
      
      /** Manager/factory for RenderTextures.
      */
      class _OgreGLExport GLRTTManager: public Singleton<GLRTTManager>
      {
      public:
          virtual ~GLRTTManager();
          
          /** Create a texture rendertarget object
          */
          virtual RenderTexture *createRenderTexture(const String &name, const GLSurfaceDesc &target, bool writeGamma, uint fsaa) = 0;
          
           /** Check if a certain format is usable as rendertexture format
          */
          virtual bool checkFormat(PixelFormat format) = 0;
          
          /** Bind a certain render target.
          */
          virtual void bind(RenderTarget *target) = 0;
          
          /** Unbind a certain render target. This is called before binding another RenderTarget, and
              before the context is switched. It can be used to do a copy, or just be a noop if direct
              binding is used.
          */
          virtual void unbind(RenderTarget *target) = 0;
  
  		/** Create a multi render target 
  		*/
  		virtual MultiRenderTarget* createMultiRenderTarget(const String & name);
          
          /** Get the closest supported alternative format. If format is supported, returns format.
          */
          virtual PixelFormat getSupportedAlternative(PixelFormat format);
      };
      
      /** RenderTexture for simple copying from frame buffer
      */
      class GLCopyingRTTManager;
      class _OgreGLExport GLCopyingRenderTexture: public GLRenderTexture
      {
      public:
          GLCopyingRenderTexture(GLCopyingRTTManager *manager, const String &name, const GLSurfaceDesc &target, 
  			bool writeGamma, uint fsaa);
          
          virtual void getCustomAttribute(const String& name, void* pData);
      };
      
      /** Simple, copying manager/factory for RenderTextures. This is only used as the last fallback if
          both PBuffers and FBOs aren't supported.
      */
      class _OgreGLExport GLCopyingRTTManager: public GLRTTManager
      {
      public:
          GLCopyingRTTManager();
          virtual ~GLCopyingRTTManager();
          
          /** @copydoc GLRTTManager::createRenderTexture
          */
          virtual RenderTexture *createRenderTexture(const String &name, const GLSurfaceDesc &target, bool writeGamma, uint fsaa);
          
          /** @copydoc GLRTTManager::checkFormat
          */
          virtual bool checkFormat(PixelFormat format);
          
          /** @copydoc GLRTTManager::bind
          */
          virtual void bind(RenderTarget *target);
          
          /** @copydoc GLRTTManager::unbind
          */
          virtual void unbind(RenderTarget *target);
      };
  }
  
  #endif // __GLTEXTURE_H__
  