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annotate docs/man3/SDL_GL_SetAttribute.3 @ 2328:91e601d9df8b

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re: bug#563. checking in some commented out trace code and a fix so that the in testalpha.c the background only flashes when alpha == 255. The problem that is being fixed is caused by clearing SDL_COPY_RLE_COLORKEY without setting SDL_COPY_RLE_DESIRED in SDL_UnRELSurface.
author Bob Pendleton <bob@pendleton.com>
date Fri, 14 Mar 2008 18:17:49 +0000
parents 546f7c1eb755
children 1238da4a7112
rev   line source
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1 .TH "SDL_GL_SetAttribute" "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_SetAttribute \- Set a special SDL/OpenGL attribute
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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 \fBint \fBSDL_GL_SetAttribute\fP\fR(\fBSDL_GLattr attr, int value\fR);
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9 .SH "DESCRIPTION"
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10 .PP
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11 Sets the OpenGL \fIattribute\fR \fBattr\fR to \fBvalue\fR\&. The attributes you set don\&'t take effect until after a call to \fI\fBSDL_SetVideoMode\fP\fR\&. You should use \fI\fBSDL_GL_GetAttribute\fP\fR to check the values after a \fBSDL_SetVideoMode\fP call\&.
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12 .SH "RETURN VALUE"
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13 .PP
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14 Returns \fB0\fR on success, or \fB-1\fR on error\&.
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15 .SH "EXAMPLE"
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16 .PP
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17 .nf
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18 \f(CWSDL_GL_SetAttribute( SDL_GL_RED_SIZE, 5 );
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19 SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 5 );
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20 SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 5 );
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21 SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 16 );
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22 SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
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23 if ( (screen=SDL_SetVideoMode( 640, 480, 16, SDL_OPENGL )) == NULL ) {
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24 fprintf(stderr, "Couldn\&'t set GL mode: %s
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25 ", SDL_GetError());
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26 SDL_Quit();
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27 return;
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28 }\fR
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29 .fi
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30 .PP
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31 .PP
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32 .RS
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33 \fBNote:
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34 .PP
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35 The \fBSDL_DOUBLEBUF\fP flag is not required to enable double buffering when setting an OpenGL video mode\&. Double buffering is enabled or disabled using the SDL_GL_DOUBLEBUFFER attribute\&.
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36 .RE
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37 .SH "SEE ALSO"
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38 .PP
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39 \fI\fBSDL_GL_GetAttribute\fP\fR, \fIGL Attributes\fR
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40 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01