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al_have_opengl_extension(3)                        al_have_opengl_extension(3)

NAME
       al_have_opengl_extension - Allegro 5 API

SYNOPSIS

              #include <allegro5/allegro_opengl.h>

              bool al_have_opengl_extension(const char *extension)

DESCRIPTION
       This function is a helper to determine whether an OpenGL extension is
       available on the given display or not.

       Example:

              bool packedpixels = al_have_opengl_extension("GL_EXT_packed_pixels");

       If packedpixels is true then you can safely use the constants related
       to the packed pixels extension.

       Returns true if the extension is available; false otherwise.

Allegro reference manual                           al_have_opengl_extension(3)