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annotate src/video/xbios/SDL_xbios.h @ 1554:0ca607a5d173

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Fixed bug #84 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 12:04:40 +0000
parents d910939febfa
children 782fd950bd46 c121d94672cb 1019eb074a56
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 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 Lesser 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 Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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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23
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24 #ifndef _SDL_xbios_h
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25 #define _SDL_xbios_h
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26
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27 #include "SDL_stdinc.h"
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28 #include "../SDL_sysvideo.h"
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29
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30 /* Hidden "this" pointer for the video functions */
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31 #define _THIS SDL_VideoDevice *this
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32
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33 /* TT video modes: 2
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34 Falcon RVB: 16 (could be *2 by adding PAL/NTSC modes)
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35 Falcon VGA: 6
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36 ST low: 1
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37 */
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38 #define SDL_NUMMODES 16
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39
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40 typedef struct
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41 {
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42 Uint16 number; /* Video mode number */
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43 Uint16 width; /* Size */
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44 Uint16 height;
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45 Uint16 depth; /* bits per plane */
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46 SDL_bool doubleline; /* Double the lines ? */
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47 } xbiosmode_t;
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48
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49 /* Private display data */
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50 #define NUM_MODELISTS 2 /* 8 and 16 bits-per-pixel */
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51
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52 struct SDL_PrivateVideoData {
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53 long cookie_vdo;
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54 int old_video_mode; /* Old video mode before entering SDL */
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55 void *old_video_base; /* Old pointer to screen buffer */
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56 void *old_palette; /* Old palette */
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57 Uint32 old_num_colors; /* Nb of colors in saved palette */
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58 int num_modes; /* Number of xbios video modes */
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59 xbiosmode_t *mode_list; /* List of xbios video modes */
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60
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61 void *screens[2]; /* Pointers to aligned screen buffer */
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62 void *screensmem[2]; /* Pointers to screen buffer */
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63 void *shadowscreen; /* Shadow screen for c2p conversion */
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64 int doubleline; /* Double line mode ? */
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65 int frame_number; /* Number of frame for double buffer */
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66 int pitch; /* Destination line width for C2P */
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67 int width, height; /* Screen size for centered C2P */
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68
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69 SDL_bool centscreen; /* Centscreen extension present ? */
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70
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71 SDL_Rect *SDL_modelist[NUM_MODELISTS][SDL_NUMMODES+1];
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72 xbiosmode_t *videomodes[NUM_MODELISTS][SDL_NUMMODES+1];
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73 };
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74
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75 /* _VDO cookie values */
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76 enum {
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77 VDO_ST=0,
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78 VDO_STE,
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79 VDO_TT,
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80 VDO_F30
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81 };
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82
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83 /* Monitor types */
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84 enum {
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85 MONITOR_MONO=0,
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86 MONITOR_TV,
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87 MONITOR_VGA,
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88 MONITOR_RGB
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89 };
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90
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91 /* EgetShift masks */
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92 #define ES_BANK 0x000f
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93 #define ES_MODE 0x0700
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94 #define ES_GRAY 0x1000
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95 #define ES_SMEAR 0x8000
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96
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97 /* TT shifter modes */
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98 #define ST_LOW 0x0000
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99 #define ST_MED 0x0100
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100 #define ST_HIGH 0x0200
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101 #define TT_LOW 0x0700
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102 #define TT_MED 0x0300
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103 #define TT_HIGH 0x0600
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104
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105 /* Hidden structure -> variables names */
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106 #define SDL_modelist (this->hidden->SDL_modelist)
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107 #define XBIOS_mutex (this->hidden->mutex)
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108 #define XBIOS_cvdo (this->hidden->cookie_vdo)
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109 #define XBIOS_oldpalette (this->hidden->old_palette)
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110 #define XBIOS_oldnumcol (this->hidden->old_num_colors)
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111 #define XBIOS_oldvbase (this->hidden->old_video_base)
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112 #define XBIOS_oldvmode (this->hidden->old_video_mode)
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113 #define XBIOS_nummodes (this->hidden->num_modes)
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114 #define XBIOS_modelist (this->hidden->mode_list)
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115 #define XBIOS_screens (this->hidden->screens)
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116 #define XBIOS_screensmem (this->hidden->screensmem)
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117 #define XBIOS_shadowscreen (this->hidden->shadowscreen)
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118 #define XBIOS_videomodes (this->hidden->videomodes)
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119 #define XBIOS_doubleline (this->hidden->doubleline)
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120 #define XBIOS_fbnum (this->hidden->frame_number)
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121 #define XBIOS_pitch (this->hidden->pitch)
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122 #define XBIOS_width (this->hidden->width)
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123 #define XBIOS_height (this->hidden->height)
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124 #define XBIOS_centscreen (this->hidden->centscreen)
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125
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126 /*--- Functions prototypes ---*/
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127
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128 void SDL_XBIOS_AddMode(_THIS, Uint16 modecode, Uint16 width, Uint16 height,
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129 Uint16 depth, SDL_bool flags);
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130
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131 #endif /* _SDL_xbios_h */