annotate docs/man3/SDL_GL_SetAttribute.3 @ 821:30168104389f

Date: Sat, 14 Feb 2004 14:52:40 +0200 From: "Mike Gorchak" Subject: Batch of the QNX6 fixes for the SDL 1. Updated readme.QNX 2. Fixed crashes during intensive window updating under fast machines (got over 200 rectangles for update). 3. Fixed double-buffered fullscreen modes, now it works as needed. 4. Fixed Photon detection algorithm. 5. Fixed HWSURFACE update function. 6. Added SDL_PHOTON_FULLSCREEN_REFRESH environment variable support for control refresh rates under Photon. 7. Added 640x400 fullscreen mode emulation via 640x480 (if videodriver not supports original 640x400 mode of course) shifted by 40 vertical pixels from begin, to center it. It's needed for some old DOS games which ran in doubled 320x200 mode. 8. Added available video ram amount support. 8. Added hardware surface allocation/deallocation support if current videomode and videodriver supports it. 9. Added hardware filling support. 10. Added hardware blits support (simple and colorkeyed). And I've added to testvidinfo test color-keyed blits benchmark (maybe need to add alpha blits benchmark too ?). Currently Photon not supporting any alpha hardware blittings (all drivers lack of alpha blitting code support, only software alpha blitting exist in photon, which is hundreds times slowest than the SDL's one). So I've not added the alpha support. I suppose new QNX 6.3 will have the hardware alpha support, so when it will be done, I'll add alpha support.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 14 Feb 2004 20:22:21 +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_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