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annotate docs/man3/SDL_GL_GetProcAddress.3 @ 1795:398ac0f88e4d

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Fixed bug #220 The AltiVec blitters don't compile, since they require __VEC__ to be enabled in order for the compiler to understand "vector" and friends (i.e. do AltiVec) But you don't want to turn AltiVec on globally, since then the code would only run on a G4 (there are already runtime tests, before using the AltiVec variants) The solution here is to enable AltiVec locally, for the actual AltiVec code.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 09 May 2006 15:09:47 +0000
parents e5bc29de3f0a
children 546f7c1eb755
rev   line source
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e5bc29de3f0a Updated from the SDL Documentation Project
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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