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annotate src/timer/mint/SDL_systimer.c @ 1662:782fd950bd46 SDL-1.3

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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:04:16 +0000
parents 92947e3a18db
children 4da1ee79c9af
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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 #ifdef SDL_TIMER_MINT
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25
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26 /*
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27 * TOS/MiNT timer driver
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28 * based on vbl vector
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29 *
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30 * Patrice Mandin
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31 */
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32
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33 #include <stdio.h>
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34 #include <sys/time.h>
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35 #include <signal.h>
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36 #include <unistd.h>
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37 #include <string.h>
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38 #include <errno.h>
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39
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40 #include <mint/cookie.h>
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41 #include <mint/sysvars.h>
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42 #include <mint/osbind.h>
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43 #include <mint/mintbind.h>
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44
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45 #include "SDL_timer.h"
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46 #include "../SDL_timer_c.h"
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47 #include "SDL_thread.h"
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48
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49 #include "SDL_vbltimer_s.h"
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50
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51 /* The first ticks value of the application */
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52 static Uint32 start;
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53 static SDL_bool supervisor;
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54 static int mint_present; /* can we use Syield() ? */
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55
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56 void
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57 SDL_StartTicks (void)
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58 {
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59 void *oldpile;
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60 unsigned long dummy;
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61
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62 /* Set first ticks value */
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63 oldpile = (void *) Super (0);
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64 start = *((volatile long *) _hz_200);
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65 Super (oldpile);
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66
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67 start *= 5; /* One _hz_200 tic is 5ms */
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69 mint_present = (Getcookie (C_MiNT, &dummy) == C_FOUND);
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70 }
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72 Uint32
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73 SDL_GetTicks (void)
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74 {
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75 Uint32 now;
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76 void *oldpile = NULL;
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77
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78 /* Check if we are in supervisor mode
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79 (this is the case when called from SDL_ThreadedTimerCheck,
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80 which is called from RunTimer, running in the vbl vector)
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81 */
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82 if (!supervisor) {
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83 oldpile = (void *) Super (0);
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84 }
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86 now = *((volatile long *) _hz_200);
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87
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88 if (!supervisor) {
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89 Super (oldpile);
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90 }
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91
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92 return ((now * 5) - start);
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93 }
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94
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95 void
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96 SDL_Delay (Uint32 ms)
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97 {
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98 Uint32 now;
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99
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100 now = SDL_GetTicks ();
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101 while ((SDL_GetTicks () - now) < ms) {
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102 if (mint_present) {
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103 Syield ();
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104 }
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105 }
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106 }
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108 /* Data to handle a single periodic alarm */
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109 static SDL_bool timer_installed = SDL_FALSE;
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110
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111 static void
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112 RunTimer (void)
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113 {
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114 supervisor = SDL_TRUE;
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115 SDL_ThreadedTimerCheck ();
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116 supervisor = SDL_FALSE;
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117 }
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119 /* This is only called if the event thread is not running */
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120 int
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121 SDL_SYS_TimerInit (void)
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122 {
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123 void *oldpile;
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124
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125 supervisor = SDL_FALSE;
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126
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127 /* Install RunTimer in vbl vector */
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128 oldpile = (void *) Super (0);
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129 timer_installed = !SDL_AtariVblInstall (RunTimer);
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130 Super (oldpile);
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131
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132 if (!timer_installed) {
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133 return (-1);
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134 }
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135 return (SDL_SetTimerThreaded (0));
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136 }
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137
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138 void
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139 SDL_SYS_TimerQuit (void)
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140 {
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141 void *oldpile;
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142
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143 if (timer_installed) {
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144 /* Uninstall RunTimer vbl vector */
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145 oldpile = (void *) Super (0);
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146 SDL_AtariVblUninstall (RunTimer);
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147 Super (oldpile);
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148 timer_installed = SDL_FALSE;
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149 }
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150 }
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151
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152 int
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153 SDL_SYS_StartTimer (void)
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154 {
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155 SDL_SetError ("Internal logic error: MiNT uses vbl timer");
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156 return (-1);
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157 }
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158
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159 void
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160 SDL_SYS_StopTimer (void)
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161 {
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162 return;
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163 }
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164
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165 #endif /* SDL_TIMER_MINT */
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166 /* vi: set ts=4 sw=4 expandtab: */