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annotate docs/man3/SDL_GL_GetProcAddress.3 @ 211:0cc95f442f3a

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If we're looking at the /dev/input event devices, and we found at least one, then we don't want to look at the input joystick devices, since they're built on top of devices that we've already seen, so we're done.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 22 Oct 2001 21:34:50 +0000
parents e5bc29de3f0a
children 546f7c1eb755
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