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annotate src/audio/alsa/SDL_alsa_audio.h @ 1555:780fd5b61df1

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Fixed bug #89 Date: Sun, 23 Oct 2005 16:39:03 +0200 From: "A. Schmid" <sahib@phreaker.net> Subject: [SDL] no software surfaces with svgalib driver? Hi, I noticed that the SDL (1.2.9) svgalib driver only makes use of linear addressable (framebuffer) video modes. On older systems (like one of mine), linear addressable modes are often not available. Especially for cards with VESA VBE < 2.0 the svgalib vesa driver is unusable, since VESA only supports framebuffering for VBE 2.0 and later. The changes necessary to add support for software surfaces seem to be relatively small. I only had to hack src/video/svga/SDL_svgavideo.c (see attached patch). The code worked fine for me, but it is no more than a proof of concept and should be reviewed (probably has a memory leak when switching modes). It also uses the vgagl library (included in the svgalib package) and needs to be linked against it. -Alex
author Sam Lantinga <slouken@libsdl.org>
date Sun, 19 Mar 2006 12:05:16 +0000
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children 782fd950bd46 a1b03ba2fcd0
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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24 #ifndef _ALSA_PCM_audio_h
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25 #define _ALSA_PCM_audio_h
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26
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27 #define ALSA_PCM_OLD_HW_PARAMS_API
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28 #define ALSA_PCM_OLD_SW_PARAMS_API
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29 #include <alsa/asoundlib.h>
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30
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31 #include "../SDL_sysaudio.h"
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32
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33 /* Hidden "this" pointer for the video functions */
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34 #define _THIS SDL_AudioDevice *this
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35
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36 struct SDL_PrivateAudioData {
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37 /* The audio device handle */
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38 snd_pcm_t *pcm_handle;
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39
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40 /* The parent process id, to detect when application quits */
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41 pid_t parent;
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42
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43 /* Raw mixing buffer */
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44 Uint8 *mixbuf;
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45 int mixlen;
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46 };
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47
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48 /* Old variable names */
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49 #define pcm_handle (this->hidden->pcm_handle)
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50 #define parent (this->hidden->parent)
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51 #define mixbuf (this->hidden->mixbuf)
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52 #define mixlen (this->hidden->mixlen)
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54 #endif /* _ALSA_PCM_audio_h */