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

     /****************************************************************************
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     ** Contact: Qt Software Information (qt-info@nokia.com)
     **
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     ** 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
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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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     ** additional rights. These rights are described in the Nokia Qt LGPL
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     ** 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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     #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(CreateShaderObjectARB)
             RESOLVE_GL_FUNC(ShaderSourceARB)
             RESOLVE_GL_FUNC(CompileShaderARB)
             RESOLVE_GL_FUNC(GetObjectParameterivARB)
             RESOLVE_GL_FUNC(DeleteObjectARB)
             RESOLVE_GL_FUNC(GetInfoLogARB)
             RESOLVE_GL_FUNC(CreateProgramObjectARB)
             RESOLVE_GL_FUNC(AttachObjectARB)
             RESOLVE_GL_FUNC(DetachObjectARB)
             RESOLVE_GL_FUNC(LinkProgramARB)
             RESOLVE_GL_FUNC(UseProgramObjectARB)
             RESOLVE_GL_FUNC(GetUniformLocationARB)
             RESOLVE_GL_FUNC(Uniform1iARB)
             RESOLVE_GL_FUNC(Uniform1fARB)
             RESOLVE_GL_FUNC(Uniform4fARB)
             RESOLVE_GL_FUNC(UniformMatrix4fvARB)

             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::glslSupported() {
         return CreateShaderObjectARB
                 && CreateShaderObjectARB
                 && ShaderSourceARB
                 && CompileShaderARB
                 && GetObjectParameterivARB
                 && DeleteObjectARB
                 && GetInfoLogARB
                 && CreateProgramObjectARB
                 && AttachObjectARB
                 && DetachObjectARB
                 && LinkProgramARB
                 && UseProgramObjectARB
                 && GetUniformLocationARB
                 && Uniform1iARB
                 && Uniform1fARB
                 && Uniform4fARB
                 && UniformMatrix4fvARB;
     }

     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