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annotate src/video/xbios/SDL_xbios.h @ 765:4c2ba6161939

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Editors Note: The original patch was modified to use SDL_Delay() instead of nanosleep because nanosleep may not be portable to all systems using SDL with the ALSA backend. This may be a moot point with the switch to blocking writes anyway... Date: Sat, 27 Dec 2003 21:47:36 +0100 From: Michel Daenzer To: Debian Bug Tracking System Subject: [SDL] Bug#225252: [PATCH] ALSA fixes Package: libsdl1.2debian-all Version: 1.2.6-2 Severity: normal Tags: patch For SDL 1.2.6, the ALSA backend was changed to call snd_pcm_open() with SND_PCM_NONBLOCK. That's a good idea per se, however, it causes high CPU usage, interrupted sound and stuttering in some games here. Taking a nanosleep whenever snd_pcm_writei() returns -EAGAIN fixes this, but I think it's more efficient to use blocking mode for the actual sound playback. Feedback from the SDL and ALSA lists appreciated. The patch also fixes the default ALSA device to be used.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 04 Jan 2004 15:40:50 +0000
parents f6ffac90895c
children b8d311d90021
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
297
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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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18
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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
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 #ifndef _SDL_xbios_h
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29 #define _SDL_xbios_h
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30
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31 #include "SDL_types.h"
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32 #include "SDL_sysvideo.h"
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33
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34 /* Hidden "this" pointer for the video functions */
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35 #define _THIS SDL_VideoDevice *this
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36
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37 /* TT video modes: 2
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38 Falcon RVB: 16 (could be *2 by adding PAL/NTSC modes)
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39 Falcon VGA: 6
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40 ST low: 1
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41 */
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42 #define SDL_NUMMODES 16
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43
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44 typedef struct
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45 {
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46 Uint16 number; /* Video mode number */
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47 Uint16 width; /* Size */
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48 Uint16 height;
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49 Uint16 depth; /* bits per plane */
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50 SDL_bool doubleline; /* Double the lines ? */
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51 } xbiosmode_t;
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52
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53 /* Private display data */
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54 #define NUM_MODELISTS 2 /* 8 and 16 bits-per-pixel */
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55
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56 struct SDL_PrivateVideoData {
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57 long cookie_vdo;
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58 int old_video_mode; /* Old video mode before entering SDL */
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59 void *old_video_base; /* Old pointer to screen buffer */
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60 void *old_palette; /* Old palette */
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61 Uint32 old_num_colors; /* Nb of colors in saved palette */
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62 int num_modes; /* Number of xbios video modes */
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63 xbiosmode_t *mode_list; /* List of xbios video modes */
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64
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65 void *screens[2]; /* Pointers to aligned screen buffer */
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66 void *screensmem[2]; /* Pointers to screen buffer */
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67 void *shadowscreen; /* Shadow screen for c2p conversion */
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68 int doubleline; /* Double line mode ? */
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69 int frame_number; /* Number of frame for double buffer */
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70 int pitch; /* Destination line width for C2P */
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71 int width, height; /* Screen size for centered C2P */
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72
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73 SDL_Rect *SDL_modelist[NUM_MODELISTS][SDL_NUMMODES+1];
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74 xbiosmode_t *videomodes[NUM_MODELISTS][SDL_NUMMODES+1];
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75 };
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76
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77 /* _VDO cookie values */
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78 enum {
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79 VDO_ST=0,
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80 VDO_STE,
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81 VDO_TT,
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82 VDO_F30
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83 };
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84
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85 /* Monitor types */
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86 enum {
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87 MONITOR_MONO=0,
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88 MONITOR_TV,
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89 MONITOR_VGA,
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90 MONITOR_RGB
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91 };
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92
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93 /* EgetShift masks */
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94 #define ES_BANK 0x000f
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95 #define ES_MODE 0x0700
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96 #define ES_GRAY 0x1000
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97 #define ES_SMEAR 0x8000
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98
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99 /* TT shifter modes */
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100 #define ST_LOW 0x0000
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101 #define ST_MED 0x0100
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102 #define ST_HIGH 0x0200
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103 #define TT_LOW 0x0700
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104 #define TT_MED 0x0300
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105 #define TT_HIGH 0x0600
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106
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107 /* Hidden structure -> variables names */
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108 #define SDL_modelist (this->hidden->SDL_modelist)
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109 #define XBIOS_mutex (this->hidden->mutex)
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110 #define XBIOS_cvdo (this->hidden->cookie_vdo)
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111 #define XBIOS_oldpalette (this->hidden->old_palette)
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112 #define XBIOS_oldnumcol (this->hidden->old_num_colors)
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113 #define XBIOS_oldvbase (this->hidden->old_video_base)
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114 #define XBIOS_oldvmode (this->hidden->old_video_mode)
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115 #define XBIOS_nummodes (this->hidden->num_modes)
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116 #define XBIOS_modelist (this->hidden->mode_list)
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117 #define XBIOS_screens (this->hidden->screens)
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118 #define XBIOS_screensmem (this->hidden->screensmem)
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119 #define XBIOS_shadowscreen (this->hidden->shadowscreen)
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120 #define XBIOS_videomodes (this->hidden->videomodes)
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121 #define XBIOS_doubleline (this->hidden->doubleline)
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122 #define XBIOS_fbnum (this->hidden->frame_number)
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123 #define XBIOS_pitch (this->hidden->pitch)
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124 #define XBIOS_width (this->hidden->width)
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125 #define XBIOS_height (this->hidden->height)
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126
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127 #endif /* _SDL_xbios_h */