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.
");
has_multitexture=0;
}
.
.
.
.
if(has_multitexture){
glActiveTextureARB_ptr(GL_TEXTURE0_ARB);
.
.
}
else{
.
.
}
SEE ALSO¶
SDL_GL_LoadLibrary