.TH "SDL_GL_GetProcAddress" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" 

.SH "NAME"

SDL_GL_GetProcAddress \- Get the address of a GL function

.SH "SYNOPSIS"

.PP

\fB#include "SDL\&.h"

.sp

\fBvoid *\fBSDL_GL_GetProcAddress\fP\fR(\fBconst char* proc\fR);

.SH "DESCRIPTION"

.PP

Returns the address of the GL function \fBproc\fR, or \fBNULL\fR if the function is not found\&. If the GL library is loaded at runtime, with \fI\fBSDL_GL_LoadLibrary\fP\fR, then \fIall\fP GL functions must be retrieved this way\&. Usually this is used to retrieve function pointers to OpenGL extensions\&.

.SH "EXAMPLE"

.PP

.nf

\f(CWtypedef void (*GL_ActiveTextureARB_Func)(unsigned int);

GL_ActiveTextureARB_Func glActiveTextureARB_ptr = 0;

int has_multitexture=1;

\&.

\&.

\&.

/* Get function pointer */

glActiveTextureARB_ptr=(GL_ActiveTextureARB_Func) SDL_GL_GetProcAddress("glActiveTextureARB");

/* Check for a valid function ptr */

if(!glActiveTextureARB_ptr){

  fprintf(stderr, "Multitexture Extensions not present\&.

");

  has_multitexture=0;

}

\&.

\&.

\&.

\&.

if(has_multitexture){

  glActiveTextureARB_ptr(GL_TEXTURE0_ARB);

  \&.

  \&.

}

else{

  \&.

  \&.

}\fR

.fi

.PP

.SH "SEE ALSO"

.PP

\fI\fBSDL_GL_LoadLibrary\fP\fR

...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01