glextensions.cpp Example File

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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