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49 lines
1.3 KiB
Groff
49 lines
1.3 KiB
Groff
.TH "SDL_GL_GetProcAddress" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference"
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.SH "NAME"
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SDL_GL_GetProcAddress\- Get the address of a GL function
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.SH "SYNOPSIS"
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.PP
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\fB#include "SDL\&.h"
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.sp
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\fBvoid *\fBSDL_GL_GetProcAddress\fP\fR(\fBconst char* proc\fR);
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.SH "DESCRIPTION"
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.PP
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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\&.
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.SH "EXAMPLE"
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.PP
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.nf
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\f(CWtypedef void (*GL_ActiveTextureARB_Func)(unsigned int);
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GL_ActiveTextureARB_Func glActiveTextureARB_ptr = 0;
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int has_multitexture=1;
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\&.
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\&.
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\&.
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/* Get function pointer */
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glActiveTextureARB_ptr=(GL_ActiveTextureARB_Func) SDL_GL_GetProcAddress("glActiveTextureARB");
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/* Check for a valid function ptr */
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if(!glActiveTextureARB_ptr){
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fprintf(stderr, "Multitexture Extensions not present\&.
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");
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has_multitexture=0;
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}
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\&.
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\&.
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\&.
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\&.
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if(has_multitexture){
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glActiveTextureARB_ptr(GL_TEXTURE0_ARB);
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\&.
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\&.
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}
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else{
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\&.
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\&.
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}\fR
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.fi
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.PP
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.SH "SEE ALSO"
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.PP
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\fI\fBSDL_GL_LoadLibrary\fP\fR
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...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01
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