GLee 5.5 + forward compat. context
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elf-stone
OpenGL on a forward-compatible context will return NULL when glGetString(GL_EXTENSIONS) is used. Instead, glGetStringi() must be used. GLee should detect when glGetString() returns NULL, fetch the appropriate symbol using wglGetProcAddress/glXGetProcAddressARB(), and then resolve extensions.
I confirm the bug. I use latest git with OpenGL 3.0 forward compatible context, and GLee does not work at all because there is no extension string any more. Please, please fix!