| .TH "SDL_GL_GetProcAddress" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" |
| .SH "NAME" |
| SDL_GL_GetProcAddress \- Get the address of a GL function |
| .SH "SYNOPSIS" |
| .PP |
| \fB#include "SDL\&.h" |
| .sp |
| \fBvoid *\fBSDL_GL_GetProcAddress\fP\fR(\fBconst char* proc\fR); |
| .SH "DESCRIPTION" |
| .PP |
| 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\&. |
| .SH "EXAMPLE" |
| .PP |
| .nf |
| \f(CWtypedef 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{ |
| \&. |
| \&. |
| }\fR |
| .fi |
| .PP |
| .SH "SEE ALSO" |
| .PP |
| \fI\fBSDL_GL_LoadLibrary\fP\fR |
| .\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01 |
