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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 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@devolution.com
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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 #include <Types.h>
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29 #include <Timer.h>
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30 #include <OSUtils.h>
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31 #include <Gestalt.h>
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32 #include <Processes.h>
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33
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34 #include <LowMem.h>
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35
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36 #include "SDL_timer.h"
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37 #include "SDL_timer_c.h"
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38
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39 #include "FastTimes.h"
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40
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41 #define MS_PER_TICK (1000.0/60.0) /* MacOS tick = 1/60 second */
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42
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43
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44 #define kTwoPower32 (4294967296.0) /* 2^32 */
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45
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46 static double start_tick;
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47 static int is_fast_inited = 0;
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48
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49 void SDL_StartTicks(void)
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50 {
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51 if ( ! is_fast_inited ) // important to check or FastTime may hang machine!
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52 SDL_SYS_TimerInit();
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53
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54 start_tick = FastMicroseconds();
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55 }
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56
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57 Uint32 SDL_GetTicks(void)
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58 {
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59
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60 if ( ! is_fast_inited )
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61 SDL_SYS_TimerInit();
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62
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63 return FastMilliseconds();
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64 }
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65
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66 void SDL_Delay(Uint32 ms)
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67 {
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68 Uint32 stop, now;
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69
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70 stop = SDL_GetTicks() + ms;
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71 do {
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72 SystemTask();
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73
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74 now = SDL_GetTicks();
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75
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76 } while ( stop > now );
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77 }
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78
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79 /*
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80 void SDL_StartTicks(void)
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81 {
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82 // FIXME: Should we implement a wrapping algorithm, like Win32?
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83 }
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84
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85 Uint32 SDL_GetTicks(void)
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86 {
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87 UnsignedWide ms;
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88
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89 Microseconds (&ms);
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90
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91 return ( ms.lo / 1000 );
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92 }
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93
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94 void SDL_Delay(Uint32 ms)
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95 {
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96
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97 UnsignedWide microsecs;
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98 UInt32 stop;
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99
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100 Microseconds (µsecs);
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101
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102 stop = microsecs.lo + (ms * 1000);
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103
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104 while ( stop > microsecs.lo ) {
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105
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106 SystemTask ();
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107
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108 Microseconds (µsecs);
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109 }
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110
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111 }*/
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112
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113 /* Data to handle a single periodic alarm */
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114 typedef struct _ExtendedTimerRec
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115 {
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116 TMTask tmTask;
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117 ProcessSerialNumber taskPSN;
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118 } ExtendedTimerRec, *ExtendedTimerPtr;
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119
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120 static ExtendedTimerRec gExtendedTimerRec;
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121
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122
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123 int SDL_SYS_TimerInit(void)
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124 {
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125 FastInitialize ();
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126 is_fast_inited = 1;
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127
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128 return(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 /* We don't need a cleanup? */
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134 return;
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135 }
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136
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137 /* Our Stub routine to set up and then call the real routine. */
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138 pascal void TimerCallbackProc(TMTaskPtr tmTaskPtr)
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139 {
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140 Uint32 ms;
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141
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142 WakeUpProcess(&((ExtendedTimerPtr) tmTaskPtr)->taskPSN);
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143
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144 ms = SDL_alarm_callback(SDL_alarm_interval);
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145 if ( ms ) {
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146 SDL_alarm_interval = ROUND_RESOLUTION(ms);
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147 PrimeTime((QElemPtr)&gExtendedTimerRec.tmTask,
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148 SDL_alarm_interval);
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149 } else {
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150 SDL_alarm_interval = 0;
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151 }
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152 }
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153
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154 int SDL_SYS_StartTimer(void)
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155 {
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156 /*
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157 * Configure the global structure that stores the timing information.
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158 */
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159 gExtendedTimerRec.tmTask.qLink = NULL;
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160 gExtendedTimerRec.tmTask.qType = 0;
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161 gExtendedTimerRec.tmTask.tmAddr = NewTimerProc(TimerCallbackProc);
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162 gExtendedTimerRec.tmTask.tmCount = 0;
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163 gExtendedTimerRec.tmTask.tmWakeUp = 0;
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164 gExtendedTimerRec.tmTask.tmReserved = 0;
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165 GetCurrentProcess(&gExtendedTimerRec.taskPSN);
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166
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167 /* Install the task record */
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168 InsXTime((QElemPtr)&gExtendedTimerRec.tmTask);
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169
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170 /* Go! */
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171 PrimeTime((QElemPtr)&gExtendedTimerRec.tmTask, SDL_alarm_interval);
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172 return(0);
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173 }
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174
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175 void SDL_SYS_StopTimer(void)
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176 {
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177 RmvTime((QElemPtr)&gExtendedTimerRec.tmTask);
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178 }
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