text: /*
  -----------------------------------------------------------------------------
  This source file is part of OGRE
      (Object-oriented Graphics Rendering Engine)
  For the latest info, see http://www.ogre3d.org/
  
  Copyright (c) 2000-2009 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 __GLES2Prerequisites_H__
  #define __GLES2Prerequisites_H__
  
  #include "OgrePrerequisites.h"
  #include "OgreMath.h"
  
  #if (OGRE_PLATFORM == OGRE_PLATFORM_WIN32)
  #	if !defined( __MINGW32__ )
  #		ifndef WIN32_LEAN_AND_MEAN
  #			define WIN32_LEAN_AND_MEAN 1
  #		endif
  #		ifndef NOMINMAX
  #			define NOMINMAX // required to stop windows.h messing up std::min
  #		endif
  #	endif
  #	define OGRE_NEW_FIX_FOR_WIN32 new 
  #else
  #	define OGRE_NEW_FIX_FOR_WIN32 OGRE_NEW
  #endif
  
  #if (OGRE_PLATFORM == OGRE_PLATFORM_IPHONE)
  #   include <OpenGLES/ES2/gl.h>
  #   include <OpenGLES/ES2/glext.h>
  #   ifdef __OBJC__
  #       include <OpenGLES/EAGL.h>
  #   endif
  #	ifndef GL_GLEXT_PROTOTYPES
  #		define  GL_GLEXT_PROTOTYPES
  #	endif
  #else
  #   include <GLES2/gl2.h>
  #   include <GLES2/gl2ext.h>
  #   include <EGL/egl.h>
  
  // Function pointers for FBO extension methods
  // Declare them here since we don't have GLEW to do it for us
  
  #	ifndef GL_GLEXT_PROTOTYPES
  extern PFNGLMAPBUFFEROESPROC glMapBufferOES;
  extern PFNGLUNMAPBUFFEROESPROC glUnmapBufferOES;
  #	endif
  
  // If we are going to use the PVRTC_CODEC make sure we
  // setup the needed constants
  #if (OGRE_NO_PVRTC_CODEC == 0)
  #	ifndef GL_IMG_texture_compression_pvrtc
  #		define GL_IMG_texture_compression_pvrtc 1
  #		define GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG                      0x8C00
  #		define GL_COMPRESSED_RGB_PVRTC_2BPPV1_IMG                      0x8C01
  #		define GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG                     0x8C02
  #		define GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG                     0x8C03
  #	endif
  #endif
  
  #endif
  
  
  // Define GL_NONE for convenience
  #define GL_NONE 0
  
  #ifndef GL_BGRA
  #   define GL_BGRA  0x80E1
  #endif
  
  #if (OGRE_PLATFORM == OGRE_PLATFORM_WIN32) && !defined(__MINGW32__) && !defined(OGRE_STATIC_LIB)
  #   ifdef OGRE_GLES2PLUGIN_EXPORTS
  #       define _OgreGLES2Export __declspec(dllexport)
  #   else
  #       if defined( __MINGW32__ )
  #           define _OgreGLES2Export
  #       else
  #           define _OgreGLES2Export __declspec(dllimport)
  #       endif
  #   endif
  #elif defined ( OGRE_GCC_VISIBILITY )
  #    define _OgreGLES2Export  __attribute__ ((visibility("default")))
  #else
  #    define _OgreGLES2Export
  #endif
  
  #define DEBUG_(text) \
      {\
          fprintf(stderr, "%s:%d: %s\n", __FUNCTION__, __LINE__, text); \
      }
  
  #define ENABLE_GL_CHECK 0
  #if ENABLE_GL_CHECK
  #define GL_CHECK_ERROR \
      { \
          int e = glGetError(); \
          if (e != 0) \
          { \
              fprintf(stderr, "OpenGL error 0x%04X in %s at line %i in %s\n", e, __PRETTY_FUNCTION__, __LINE__, __FILE__); \
          } \
      }
  #else
      #define GL_CHECK_ERROR {}
  #endif
  
  #if ENABLE_GL_CHECK
      #define EGL_CHECK_ERROR \
      { \
          int e = eglGetError(); \
          if ((e != 0) && (e != EGL_SUCCESS))\
          { \
              fprintf(stderr, "OpenGL error 0x%04X in %s at line %i in %s\n", e, __PRETTY_FUNCTION__, __LINE__, __FILE__); \
              assert(false); \
          } \
      }
  #else
      #define EGL_CHECK_ERROR {}
  #endif
  
  #endif
  