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

     2 .SH "NAME"

     3 SDL_GL_GetProcAddress \- Get the address of a GL function

     4 .SH "SYNOPSIS"

     5 .PP

     6 \fB#include "SDL\&.h"

     7 .sp

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

     9 .SH "DESCRIPTION"

    10 .PP

    11 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\&.

    12 .SH "EXAMPLE"

    13 .PP

    14 .nf

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

    16 GL_ActiveTextureARB_Func glActiveTextureARB_ptr = 0;

    17 int has_multitexture=1;

    18 \&.

    19 \&.

    20 \&.

    21 /* Get function pointer */

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

    23 

    24 /* Check for a valid function ptr */

    25 if(!glActiveTextureARB_ptr){

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

    27 ");

    28   has_multitexture=0;

    29 }

    30 \&.

    31 \&.

    32 \&.

    33 \&.

    34 if(has_multitexture){

    35   glActiveTextureARB_ptr(GL_TEXTURE0_ARB);

    36   \&.

    37   \&.

    38 }

    39 else{

    40   \&.

    41   \&.

    42 }\fR

    43 .fi

    44 .PP

    45 .SH "SEE ALSO"

    46 .PP

    47 \fI\fBSDL_GL_LoadLibrary\fP\fR

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