al_get_opengl_proc_address3alleg5
Allegro 5 api
Usage
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#include <allegro5/allegro_opengl.h> void *al_get_opengl_proc_address(const char *name)
Overview
Helper to get the address of an OpenGL symbol
Example:
How to get the function glMultiTexCoord3fARB that comes with ARB’s Multitexture extension:
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// 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.
Releases
6 releases since Debian 8 (Jessie); the text changed 5 times.