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# glextensions.h Example File
demos/boxes/glextensions.h

     /****************************************************************************
     **
     ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
     ** All rights reserved.
     ** Contact: Nokia Corporation (qt-info@nokia.com)
     **
     ** This file is part of the demonstration applications of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:LGPL$
     ** Commercial Usage
     ** Licensees holding valid Qt Commercial licenses may use this file in
     ** accordance with the Qt Commercial License Agreement provided with the
     ** Software or, alternatively, in accordance with the terms contained in
     ** a written agreement between you and Nokia.
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     ** GNU Lesser General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU Lesser
     ** General Public License version 2.1 as published by the Free Software
     ** Foundation and appearing in the file LICENSE.LGPL included in the
     ** packaging of this file.  Please review the following information to
     ** ensure the GNU Lesser General Public License version 2.1 requirements
     ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
     **
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     ** rights.  These rights are described in the Nokia Qt LGPL Exception
     ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
     **
     ** GNU General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU
     ** General Public License version 3.0 as published by the Free Software
     ** Foundation and appearing in the file LICENSE.GPL included in the
     ** packaging of this file.  Please review the following information to
     ** ensure the GNU General Public License version 3.0 requirements will be
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     #ifndef GLEXTENSIONS_H
     #define GLEXTENSIONS_H

     #include <QtOpenGL>

     /*
     Functions resolved:

     glGenFramebuffersEXT
     glGenRenderbuffersEXT
     glBindRenderbufferEXT
     glRenderbufferStorageEXT
     glDeleteFramebuffersEXT
     glDeleteRenderbuffersEXT
     glBindFramebufferEXT
     glFramebufferTexture2DEXT
     glFramebufferRenderbufferEXT
     glCheckFramebufferStatusEXT

     glActiveTexture
     glTexImage3D

     glGenBuffers
     glBindBuffer
     glBufferData
     glDeleteBuffers
     glMapBuffer
     glUnmapBuffer
     */

     #ifndef Q_WS_MAC
     # ifndef APIENTRYP
     #   ifdef APIENTRY
     #     define APIENTRYP APIENTRY *
     #   else
     #     define APIENTRY
     #     define APIENTRYP *
     #   endif
     # endif
     #else
     # define APIENTRY
     # define APIENTRYP *
     #endif

     #ifndef GL_VERSION_1_2
     #define GL_TEXTURE_3D 0x806F
     #define GL_TEXTURE_WRAP_R 0x8072
     #define GL_CLAMP_TO_EDGE 0x812F
     #define GL_BGRA 0x80E1
     #endif

     #ifndef GL_VERSION_1_3
     #define GL_TEXTURE0 0x84C0
     #define GL_TEXTURE1 0x84C1
     #define GL_TEXTURE2 0x84C2
     #define GL_TEXTURE_CUBE_MAP 0x8513
     #define GL_TEXTURE_CUBE_MAP_POSITIVE_X 0x8515
     //#define GL_TEXTURE_CUBE_MAP_NEGATIVE_X 0x8516
     //#define GL_TEXTURE_CUBE_MAP_POSITIVE_Y 0x8517
     //#define GL_TEXTURE_CUBE_MAP_NEGATIVE_Y 0x8518
     //#define GL_TEXTURE_CUBE_MAP_POSITIVE_Z 0x8519
     //#define GL_TEXTURE_CUBE_MAP_NEGATIVE_Z 0x851A
     #endif

     #ifndef GL_ARB_vertex_buffer_object
     typedef ptrdiff_t GLsizeiptrARB;
     #endif

     #ifndef GL_VERSION_1_5
     #define GL_ARRAY_BUFFER 0x8892
     #define GL_ELEMENT_ARRAY_BUFFER 0x8893
     #define GL_READ_WRITE 0x88BA
     #define GL_STATIC_DRAW 0x88E4
     #endif

     #ifndef GL_EXT_framebuffer_object
     #define GL_RENDERBUFFER_EXT 0x8D41
     #define GL_FRAMEBUFFER_EXT 0x8D40
     #define GL_FRAMEBUFFER_COMPLETE_EXT 0x8CD5
     #define GL_COLOR_ATTACHMENT0_EXT 0x8CE0
     #define GL_DEPTH_ATTACHMENT_EXT 0x8D00
     #endif

     typedef void (APIENTRY *_glGenFramebuffersEXT) (GLsizei, GLuint *);
     typedef void (APIENTRY *_glGenRenderbuffersEXT) (GLsizei, GLuint *);
     typedef void (APIENTRY *_glBindRenderbufferEXT) (GLenum, GLuint);
     typedef void (APIENTRY *_glRenderbufferStorageEXT) (GLenum, GLenum, GLsizei, GLsizei);
     typedef void (APIENTRY *_glDeleteFramebuffersEXT) (GLsizei, const GLuint*);
     typedef void (APIENTRY *_glDeleteRenderbuffersEXT) (GLsizei, const GLuint*);
     typedef void (APIENTRY *_glBindFramebufferEXT) (GLenum, GLuint);
     typedef void (APIENTRY *_glFramebufferTexture2DEXT) (GLenum, GLenum, GLenum, GLuint, GLint);
     typedef void (APIENTRY *_glFramebufferRenderbufferEXT) (GLenum, GLenum, GLenum, GLuint);
     typedef GLenum (APIENTRY *_glCheckFramebufferStatusEXT) (GLenum);

     typedef void (APIENTRY *_glActiveTexture) (GLenum);
     typedef void (APIENTRY *_glTexImage3D) (GLenum, GLint, GLenum, GLsizei, GLsizei, GLsizei, GLint, GLenum, GLenum, const GLvoid *);

     typedef void (APIENTRY *_glGenBuffers) (GLsizei, GLuint *);
     typedef void (APIENTRY *_glBindBuffer) (GLenum, GLuint);
     typedef void (APIENTRY *_glBufferData) (GLenum, GLsizeiptrARB, const GLvoid *, GLenum);
     typedef void (APIENTRY *_glDeleteBuffers) (GLsizei, const GLuint *);
     typedef void *(APIENTRY *_glMapBuffer) (GLenum, GLenum);
     typedef GLboolean (APIENTRY *_glUnmapBuffer) (GLenum);

     struct GLExtensionFunctions
     {
             bool resolve(const QGLContext *context);

         bool fboSupported();
         bool openGL15Supported(); // the rest: multi-texture, 3D-texture, vertex buffer objects

             _glGenFramebuffersEXT GenFramebuffersEXT;
             _glGenRenderbuffersEXT GenRenderbuffersEXT;
             _glBindRenderbufferEXT BindRenderbufferEXT;
             _glRenderbufferStorageEXT RenderbufferStorageEXT;
             _glDeleteFramebuffersEXT DeleteFramebuffersEXT;
             _glDeleteRenderbuffersEXT DeleteRenderbuffersEXT;
             _glBindFramebufferEXT BindFramebufferEXT;
             _glFramebufferTexture2DEXT FramebufferTexture2DEXT;
             _glFramebufferRenderbufferEXT FramebufferRenderbufferEXT;
             _glCheckFramebufferStatusEXT CheckFramebufferStatusEXT;

             _glActiveTexture ActiveTexture;
             _glTexImage3D TexImage3D;

             _glGenBuffers GenBuffers;
             _glBindBuffer BindBuffer;
             _glBufferData BufferData;
             _glDeleteBuffers DeleteBuffers;
             _glMapBuffer MapBuffer;
             _glUnmapBuffer UnmapBuffer;
     };

     inline GLExtensionFunctions &getGLExtensionFunctions()
     {
             static GLExtensionFunctions funcs;
             return funcs;
     }

     #define glGenFramebuffersEXT getGLExtensionFunctions().GenFramebuffersEXT
     #define glGenRenderbuffersEXT getGLExtensionFunctions().GenRenderbuffersEXT
     #define glBindRenderbufferEXT getGLExtensionFunctions().BindRenderbufferEXT
     #define glRenderbufferStorageEXT getGLExtensionFunctions().RenderbufferStorageEXT
     #define glDeleteFramebuffersEXT getGLExtensionFunctions().DeleteFramebuffersEXT
     #define glDeleteRenderbuffersEXT getGLExtensionFunctions().DeleteRenderbuffersEXT
     #define glBindFramebufferEXT getGLExtensionFunctions().BindFramebufferEXT
     #define glFramebufferTexture2DEXT getGLExtensionFunctions().FramebufferTexture2DEXT
     #define glFramebufferRenderbufferEXT getGLExtensionFunctions().FramebufferRenderbufferEXT
     #define glCheckFramebufferStatusEXT getGLExtensionFunctions().CheckFramebufferStatusEXT

     #define glActiveTexture getGLExtensionFunctions().ActiveTexture
     #define glTexImage3D getGLExtensionFunctions().TexImage3D

     #define glGenBuffers getGLExtensionFunctions().GenBuffers
     #define glBindBuffer getGLExtensionFunctions().BindBuffer
     #define glBufferData getGLExtensionFunctions().BufferData
     #define glDeleteBuffers getGLExtensionFunctions().DeleteBuffers
     #define glMapBuffer getGLExtensionFunctions().MapBuffer
     #define glUnmapBuffer getGLExtensionFunctions().UnmapBuffer

     #endif