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annotate docs/man3/SDL_GL_GetProcAddress.3 @ 2939:084e5b4fc5be

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author Ryan C. Gordon <icculus@icculus.org>
date Thu, 01 Jan 2009 07:58:20 +0000
parents 546f7c1eb755
children 1238da4a7112
rev   line source
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1 .TH "SDL_GL_GetProcAddress" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference"
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2 .SH "NAME"
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3 SDL_GL_GetProcAddress \- Get the address of a GL function
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4 .SH "SYNOPSIS"
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5 .PP
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6 \fB#include "SDL\&.h"
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7 .sp
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8 \fBvoid *\fBSDL_GL_GetProcAddress\fP\fR(\fBconst char* proc\fR);
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9 .SH "DESCRIPTION"
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10 .PP
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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\&.
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12 .SH "EXAMPLE"
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13 .PP
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14 .nf
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15 \f(CWtypedef void (*GL_ActiveTextureARB_Func)(unsigned int);
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16 GL_ActiveTextureARB_Func glActiveTextureARB_ptr = 0;
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17 int has_multitexture=1;
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18 \&.
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19 \&.
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20 \&.
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21 /* Get function pointer */
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22 glActiveTextureARB_ptr=(GL_ActiveTextureARB_Func) SDL_GL_GetProcAddress("glActiveTextureARB");
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23
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24 /* Check for a valid function ptr */
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25 if(!glActiveTextureARB_ptr){
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26 fprintf(stderr, "Multitexture Extensions not present\&.
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27 ");
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28 has_multitexture=0;
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29 }
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30 \&.
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31 \&.
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32 \&.
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33 \&.
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34 if(has_multitexture){
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35 glActiveTextureARB_ptr(GL_TEXTURE0_ARB);
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36 \&.
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37 \&.
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38 }
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39 else{
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40 \&.
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41 \&.
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42 }\fR
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43 .fi
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44 .PP
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45 .SH "SEE ALSO"
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46 .PP
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47 \fI\fBSDL_GL_LoadLibrary\fP\fR
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48 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01