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 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.