al_have_opengl_extension - Man Page

#include <allegro5/allegro_opengl.h>

bool al_have_opengl_extension(const char *extension)

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.

al_get_opengl_extension_list(3).