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.TH "al_get_opengl_proc_address" "3" "" "Allegro reference manual"
.SH NAME
al_get_opengl_proc_address \- Allegro 5 API
.SH SYNOPSIS
.IP
.EX
#include \f[B]<allegro5/allegro_opengl.h>\f[R]

void *al_get_opengl_proc_address(const char *name)
.EE
.SH DESCRIPTION
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
.EX
\f[I]// define the type of the function\f[R]
ALLEGRO_DEFINE_PROC_TYPE(void, MULTI_TEX_FUNC,
                         (GLenum, GLfloat, GLfloat, GLfloat));
\f[I]// declare the function pointer\f[R]
MULTI_TEX_FUNC glMultiTexCoord3fARB;
\f[I]// get the address of the function\f[R]
glMultiTexCoord3fARB = (MULTI_TEX_FUNC) al_get_opengl_proc_address(
                                                        \[dq]glMultiTexCoord3fARB\[dq]);
.EE
.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
A pointer to the symbol if available or NULL otherwise.