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annotate src/timer/mint/SDL_systimer.c @ 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 92947e3a18db
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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 /*
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25 * TOS/MiNT timer driver
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26 * based on vbl vector
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27 *
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28 * Patrice Mandin
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29 */
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30
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31 #include <stdio.h>
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32 #include <sys/time.h>
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33 #include <signal.h>
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34 #include <unistd.h>
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35 #include <string.h>
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36 #include <errno.h>
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37
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38 #include <mint/cookie.h>
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39 #include <mint/sysvars.h>
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40 #include <mint/osbind.h>
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41 #include <mint/mintbind.h>
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42
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43 #include "SDL_timer.h"
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44 #include "../SDL_timer_c.h"
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45 #include "SDL_thread.h"
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46
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47 #include "SDL_vbltimer_s.h"
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48
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49 /* The first ticks value of the application */
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50 static Uint32 start;
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51 static SDL_bool supervisor;
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52 static int mint_present; /* can we use Syield() ? */
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53
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54 void SDL_StartTicks(void)
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55 {
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56 void *oldpile;
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57 unsigned long dummy;
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58
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59 /* Set first ticks value */
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60 oldpile=(void *)Super(0);
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61 start=*((volatile long *)_hz_200);
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62 Super(oldpile);
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63
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64 start *= 5; /* One _hz_200 tic is 5ms */
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65
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66 mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND);
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67 }
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68
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69 Uint32 SDL_GetTicks (void)
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70 {
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71 Uint32 now;
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72 void *oldpile=NULL;
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73
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74 /* Check if we are in supervisor mode
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75 (this is the case when called from SDL_ThreadedTimerCheck,
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76 which is called from RunTimer, running in the vbl vector)
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77 */
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78 if (!supervisor) {
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79 oldpile=(void *)Super(0);
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80 }
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81
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82 now=*((volatile long *)_hz_200);
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83
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84 if (!supervisor) {
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85 Super(oldpile);
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86 }
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87
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88 return((now*5)-start);
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89 }
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90
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91 void SDL_Delay (Uint32 ms)
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92 {
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93 Uint32 now;
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94
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95 now = SDL_GetTicks();
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96 while ((SDL_GetTicks()-now)<ms){
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97 if (mint_present) {
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98 Syield();
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99 }
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100 }
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101 }
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102
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103 /* Data to handle a single periodic alarm */
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104 static SDL_bool timer_installed=SDL_FALSE;
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105
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106 static void RunTimer(void)
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107 {
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108 supervisor=SDL_TRUE;
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109 SDL_ThreadedTimerCheck();
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110 supervisor=SDL_FALSE;
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111 }
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112
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113 /* This is only called if the event thread is not running */
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114 int SDL_SYS_TimerInit(void)
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115 {
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116 void *oldpile;
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117
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118 supervisor=SDL_FALSE;
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119
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120 /* Install RunTimer in vbl vector */
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121 oldpile=(void *)Super(0);
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122 timer_installed = !SDL_AtariVblInstall(RunTimer);
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123 Super(oldpile);
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124
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125 if (!timer_installed) {
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126 return(-1);
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127 }
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128 return(SDL_SetTimerThreaded(0));
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129 }
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130
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131 void SDL_SYS_TimerQuit(void)
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132 {
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133 void *oldpile;
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135 if (timer_installed) {
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136 /* Uninstall RunTimer vbl vector */
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137 oldpile=(void *)Super(0);
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138 SDL_AtariVblUninstall(RunTimer);
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139 Super(oldpile);
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140 timer_installed = SDL_FALSE;
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141 }
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142 }
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143
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144 int SDL_SYS_StartTimer(void)
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145 {
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146 SDL_SetError("Internal logic error: MiNT uses vbl timer");
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147 return(-1);
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148 }
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149
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150 void SDL_SYS_StopTimer(void)
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151 {
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152 return;
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153 }