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# SDL_GL_GetProcAddress

## Name

SDL_GL_GetProcAddress -- Get the address of a GL function

## Synopsis

    #include "SDL.h"

``void *SDL_GL_GetProcAddress`(const char* proc);`

## Description

Returns the address of the GL function `proc`, or NULL if the function is not found. If the GL library is loaded at runtime, with `SDL_GL_LoadLibrary`, then all GL functions must be retrieved this way. Usually this is used to retrieve function pointers to OpenGL extensions.

## Example

    typedef 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.\n");
      has_multitexture=0;
    }
    .
    .
    .
    .
    if(has_multitexture){
      glActiveTextureARB_ptr(GL_TEXTURE0_ARB);
      .
      .
    }
    else{
      .
      .
    }

## See Also

`SDL_GL_LoadLibrary`

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