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al_get_ope...oc_address(3)  Library Functions Manual  al_get_ope...oc_address(3)

NAME
     al_get_opengl_proc_address - Allegro 5 API

SYNOPSIS
	    #include <allegro5/allegro_opengl.h>

	    void *al_get_opengl_proc_address(const char *name)

DESCRIPTION
     Helper to get the address of an OpenGL symbol

     Example:

     How  to  get the function glMultiTexCoord3fARB that comes with ARB's Multi-
     texture extension:

	    // define the type of the function
	    ALLEGRO_DEFINE_PROC_TYPE(void, MULTI_TEX_FUNC,
				     (GLenum, GLfloat, GLfloat, GLfloat));
	    // declare the function pointer
	    MULTI_TEX_FUNC glMultiTexCoord3fARB;
	    // get the address of the function
	    glMultiTexCoord3fARB = (MULTI_TEX_FUNC) al_get_opengl_proc_address(
								    "glMultiTexCoord3fARB");

     If glMultiTexCoord3fARB is not NULL then it can be used as if it  has  been
     defined in the OpenGL core library.

	    Note:  Under  Windows,  OpenGL  functions may need a special calling
	    convention, so it's best to always use the	ALLEGRO_DEFINE_PROC_TYPE
	    macro when declaring function pointer types for OpenGL functions.

     Parameters:

     name - The name of the symbol you want to link to.

RETURN VALUE
     A pointer to the symbol if available or NULL otherwise.

Allegro reference manual			      al_get_ope...oc_address(3)

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<https://man.freebsd.org/cgi/man.cgi?query=al_get_opengl_proc_address&sektion=3&manpath=FreeBSD+Ports+15.1.quarterly>

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