| 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 |