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

     /****************************************************************************
     **
     ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
     ** Contact: Qt Software Information (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.
     **
     ** 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.
     **
     ** In addition, as a special exception, Nokia gives you certain
     ** additional rights. These rights are described in the Nokia Qt LGPL
     ** Exception version 1.0, 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
     ** met: http://www.gnu.org/copyleft/gpl.html.
     **
     ** If you are unsure which license is appropriate for your use, please
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     ****************************************************************************/

     #ifndef GLEXTENSIONS_H
     #define GLEXTENSIONS_H

     #include <QtOpenGL>

     /*
     Functions resolved:

     glCreateShaderObjectARB
     glShaderSourceARB
     glCompileShaderARB
     glGetObjectParameterivARB
     glDeleteObjectARB
     glGetInfoLogARB
     glCreateProgramObjectARB
     glAttachObjectARB
     glDetachObjectARB
     glLinkProgramARB
     glUseProgramObjectARB
     glGetUniformLocationARB
     glUniform1iARB
     glUniform1fARB
     glUniform4fARB
     glUniformMatrix4fvARB

     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_VERSION_1_5
     typedef ptrdiff_t GLsizeiptr;
     #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

     #ifndef GL_ARB_vertex_shader
     #define GL_VERTEX_SHADER_ARB 0x8B31
     #endif

     #ifndef GL_ARB_fragment_shader
     #define GL_FRAGMENT_SHADER_ARB 0x8B30
     #endif

     #ifndef GL_ARB_shader_objects
     typedef char GLcharARB;
     typedef unsigned int GLhandleARB;
     #define GL_OBJECT_COMPILE_STATUS_ARB 0x8B81
     #define GL_OBJECT_LINK_STATUS_ARB 0x8B82
     #define GL_OBJECT_INFO_LOG_LENGTH_ARB 0x8B84
     #endif

     typedef GLhandleARB (APIENTRY *_glCreateShaderObjectARB) (GLenum);
     typedef void (APIENTRY *_glShaderSourceARB) (GLhandleARB, GLuint, const GLcharARB**, GLint *);
     typedef void (APIENTRY *_glCompileShaderARB) (GLhandleARB);
     typedef void (APIENTRY *_glGetObjectParameterivARB) (GLhandleARB, GLenum, int *);
     typedef void (APIENTRY *_glDeleteObjectARB) (GLhandleARB);
     typedef void (APIENTRY *_glGetInfoLogARB) (GLhandleARB, GLsizei, GLsizei *, GLcharARB *);
     typedef GLhandleARB (APIENTRY *_glCreateProgramObjectARB) ();
     typedef void (APIENTRY *_glAttachObjectARB) (GLhandleARB, GLhandleARB);
     typedef void (APIENTRY *_glDetachObjectARB) (GLhandleARB, GLhandleARB);
     typedef void (APIENTRY *_glLinkProgramARB) (GLhandleARB);
     typedef void (APIENTRY *_glUseProgramObjectARB) (GLhandleARB);
     typedef GLint (APIENTRY *_glGetUniformLocationARB) (GLhandleARB, const GLcharARB *);
     typedef void (APIENTRY *_glUniform1iARB) (GLint, GLint);
     typedef void (APIENTRY *_glUniform1fARB) (GLint, GLfloat);
     typedef void (APIENTRY *_glUniform4fARB) (GLint, GLfloat, GLfloat, GLfloat, GLfloat);
     typedef void (APIENTRY *_glUniformMatrix4fvARB) (GLint, GLuint, GLboolean, const GLfloat *);

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

             _glCreateShaderObjectARB CreateShaderObjectARB;
             _glShaderSourceARB ShaderSourceARB;
             _glCompileShaderARB CompileShaderARB;
             _glGetObjectParameterivARB GetObjectParameterivARB;
             _glDeleteObjectARB DeleteObjectARB;
             _glGetInfoLogARB GetInfoLogARB;
             _glCreateProgramObjectARB CreateProgramObjectARB;
             _glAttachObjectARB AttachObjectARB;
             _glDetachObjectARB DetachObjectARB;
             _glLinkProgramARB LinkProgramARB;
             _glUseProgramObjectARB UseProgramObjectARB;
             _glGetUniformLocationARB GetUniformLocationARB;
             _glUniform1iARB Uniform1iARB;
             _glUniform1fARB Uniform1fARB;
             _glUniform4fARB Uniform4fARB;
             _glUniformMatrix4fvARB UniformMatrix4fvARB;

             _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 glCreateShaderObjectARB getGLExtensionFunctions().CreateShaderObjectARB
     #define glShaderSourceARB getGLExtensionFunctions().ShaderSourceARB
     #define glCompileShaderARB getGLExtensionFunctions().CompileShaderARB
     #define glGetObjectParameterivARB getGLExtensionFunctions().GetObjectParameterivARB
     #define glDeleteObjectARB getGLExtensionFunctions().DeleteObjectARB
     #define glGetInfoLogARB getGLExtensionFunctions().GetInfoLogARB
     #define glCreateProgramObjectARB getGLExtensionFunctions().CreateProgramObjectARB
     #define glAttachObjectARB getGLExtensionFunctions().AttachObjectARB
     #define glDetachObjectARB getGLExtensionFunctions().DetachObjectARB
     #define glLinkProgramARB getGLExtensionFunctions().LinkProgramARB
     #define glUseProgramObjectARB getGLExtensionFunctions().UseProgramObjectARB
     #define glGetUniformLocationARB getGLExtensionFunctions().GetUniformLocationARB
     #define glUniform1iARB getGLExtensionFunctions().Uniform1iARB
     #define glUniform1fARB getGLExtensionFunctions().Uniform1fARB
     #define glUniform4fARB getGLExtensionFunctions().Uniform4fARB
     #define glUniformMatrix4fvARB getGLExtensionFunctions().UniformMatrix4fvARB

     #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