al_get_opengl_proc_address (3alleg5)

• #include <allegro5/allegro_opengl.h>
  
  void *al_get_opengl_proc_address(const char *name)
  
  

Helper to get the address of an OpenGL symbol

Example:

How to get the function glMultiTexCoord3fARB that comes with ARB\[aq]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\[aq]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.

A pointer to the symbol if available or NULL otherwise.