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.