al_get_opengl_proc_address man page on DragonFly

al_get_opengl_proc_address man page on DragonFly

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al_get_opengl_proc_address(3)			 al_get_opengl_proc_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 Mul‐
       titexture 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	 ALLE‐
	      GRO_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_opengl_proc_address(3)

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