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.TH "al_get_opengl_proc_address" "3alleg5" "" "Allegro reference manual" ""
.hy
.SH NAME
.PP
al_get_opengl_proc_address - Allegro 5 API
.SH SYNOPSIS
.IP
.nf
\f[C]
#include <allegro5/allegro_opengl.h>

void *al_get_opengl_proc_address(const char *name)
\f[R]
.fi
.SH DESCRIPTION
.PP
Helper to get the address of an OpenGL symbol
.PP
Example:
.PP
How to get the function \f[I]glMultiTexCoord3fARB\f[R] that comes with
ARB\[cq]s Multitexture extension:
.IP
.nf
\f[C]
// 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(
                                                        \[dq]glMultiTexCoord3fARB\[dq]);
\f[R]
.fi
.PP
If \f[I]glMultiTexCoord3fARB\f[R] is not NULL then it can be used as if
it has been defined in the OpenGL core library.
.RS
.PP
\f[I]Note:\f[R] Under Windows, OpenGL functions may need a special
calling convention, so it\[cq]s best to always use the
ALLEGRO_DEFINE_PROC_TYPE macro when declaring function pointer types for
OpenGL functions.
.RE
.PP
Parameters:
.PP
name - The name of the symbol you want to link to.
.SH RETURN VALUE
.PP
A pointer to the symbol if available or NULL otherwise.