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 #include &quot;glextensions.h&quot;

 #define RESOLVE_GL_FUNC(f) ok &amp;= bool((f = (_gl##f) context-&gt;getProcAddress(QLatin1String(&quot;gl&quot; #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
             &amp;&amp; GenRenderbuffersEXT
             &amp;&amp; BindRenderbufferEXT
             &amp;&amp; RenderbufferStorageEXT
             &amp;&amp; DeleteFramebuffersEXT
             &amp;&amp; DeleteRenderbuffersEXT
             &amp;&amp; BindFramebufferEXT
             &amp;&amp; FramebufferTexture2DEXT
             &amp;&amp; FramebufferRenderbufferEXT
             &amp;&amp; CheckFramebufferStatusEXT;
 }

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

 #undef RESOLVE_GL_FUNC</pre>
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