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al_get_opengl_proc_address(3alleg5) Allegro reference manual() al_get_opengl_proc_address(3alleg5) Allegro reference manual()

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 Multitexture 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.