Qt 4.6: glextensions.cpp Example File (demos/boxes/glextensions.cpp)

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

     /****************************************************************************
     **
     ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
     ** Contact: Nokia Corporation (qt-info@nokia.com)
     **
     ** This file is part of the demonstration applications of the Qt Toolkit.
     **
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     ** This file contains pre-release code and may not be distributed.
     ** You may use this file in accordance with the terms and conditions
     ** contained in the Technology Preview License Agreement accompanying
     ** this package.
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     ** GNU Lesser General Public License Usage
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     ** General Public License version 2.1 as published by the Free Software
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     ** packaging of this file.  Please review the following information to
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     #include "glextensions.h"

     #define RESOLVE_GL_FUNC(f) ok &= bool((f = (_gl##f) context->getProcAddress(QLatin1String("gl" #f))));

     bool GLExtensionFunctions::resolve(const QGLContext *context)
     {
             bool ok = true;

             RESOLVE_GL_FUNC(GenFramebuffersEXT)
             RESOLVE_GL_FUNC(GenRenderbuffersEXT)
             RESOLVE_GL_FUNC(BindRenderbufferEXT)
             RESOLVE_GL_FUNC(RenderbufferStorageEXT)
             RESOLVE_GL_FUNC(DeleteFramebuffersEXT)
             RESOLVE_GL_FUNC(DeleteRenderbuffersEXT)
             RESOLVE_GL_FUNC(BindFramebufferEXT)
             RESOLVE_GL_FUNC(FramebufferTexture2DEXT)
             RESOLVE_GL_FUNC(FramebufferRenderbufferEXT)
             RESOLVE_GL_FUNC(CheckFramebufferStatusEXT)

             RESOLVE_GL_FUNC(ActiveTexture)
             RESOLVE_GL_FUNC(TexImage3D)

             RESOLVE_GL_FUNC(GenBuffers)
             RESOLVE_GL_FUNC(BindBuffer)
             RESOLVE_GL_FUNC(BufferData)
             RESOLVE_GL_FUNC(DeleteBuffers)
             RESOLVE_GL_FUNC(MapBuffer)
             RESOLVE_GL_FUNC(UnmapBuffer)

             return ok;
     }

     bool GLExtensionFunctions::fboSupported() {
         return GenFramebuffersEXT
                 && GenRenderbuffersEXT
                 && BindRenderbufferEXT
                 && RenderbufferStorageEXT
                 && DeleteFramebuffersEXT
                 && DeleteRenderbuffersEXT
                 && BindFramebufferEXT
                 && FramebufferTexture2DEXT
                 && FramebufferRenderbufferEXT
                 && CheckFramebufferStatusEXT;
     }

     bool GLExtensionFunctions::openGL15Supported() {
         return ActiveTexture
                 && TexImage3D
                 && GenBuffers
                 && BindBuffer
                 && BufferData
                 && DeleteBuffers
                 && MapBuffer
                 && UnmapBuffer;
     }

     #undef RESOLVE_GL_FUNC