SDL_GL_GetProcAddress — Get the address of a GL function
#include "SDL.h"
void
*SDL_GL_GetProcAddress( |
const char* | proc); |
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.
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.
");
has_multitexture=0;
}
.
.
.
.
if(has_multitexture){
glActiveTextureARB_ptr(GL_TEXTURE0_ARB);
.
.
}
else{
.
.
}