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+ − 1 .TH "SDL_GL_GetProcAddress" "3" "Mon 12 Mar 2001, 01:04" "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, Mon 12 Mar 2001, 01:04
