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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 #define MS_PER_TICK (1000/60) /* MacOS tick = 1/60 second */
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40
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41 /* Note: This is only a step above the original 1/60s implementation.
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42 * For a good implementation, see FastTimes.[ch], by Matt Slot.
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43 */
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44 #define USE_MICROSECONDS
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45 #define WideTo64bit(w) (*(UInt64 *) &(w))
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46
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47 UInt64 start;
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48
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49 void SDL_StartTicks(void)
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50 {
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51 #ifdef USE_MICROSECONDS
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52 UnsignedWide now;
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53
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54 Microseconds(&now);
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55 start = WideTo64bit(now);
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56 #else
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57 /* FIXME: Should we implement a wrapping algorithm, like Win32? */
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58 #endif
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59 }
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60
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61 Uint32 SDL_GetTicks(void)
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62 {
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63 #ifdef USE_MICROSECONDS
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64 UnsignedWide now;
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65
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66 Microseconds(&now);
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67 return (Uint32)((WideTo64bit(now)-start)/1000);
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68 #else
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69 return(LMGetTicks()*MS_PER_TICK);
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70 #endif
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71 }
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72
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73 void SDL_Delay(Uint32 ms)
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74 {
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75 #ifdef USE_MICROSECONDS
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76 Uint32 end_ms;
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77
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78 end_ms = SDL_GetTicks() + ms;
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79 do {
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80 /* FIXME: Yield CPU? */ ;
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81 } while ( SDL_GetTicks() < end_ms );
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82 #else
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83 UInt32 unused; /* MJS */
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84 Delay(ms/MS_PER_TICK, &unused);
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85 #endif
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86 }
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87
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88
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89 /* Data to handle a single periodic alarm */
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90 typedef struct _ExtendedTimerRec
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91 {
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92 TMTask tmTask;
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93 ProcessSerialNumber taskPSN;
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94 } ExtendedTimerRec, *ExtendedTimerPtr;
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95
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96 static ExtendedTimerRec gExtendedTimerRec;
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97
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98
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99 int SDL_SYS_TimerInit(void)
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100 {
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101 /* We don't need a setup? */
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102 return(0);
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103 }
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104
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105 void SDL_SYS_TimerQuit(void)
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106 {
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107 /* We don't need a cleanup? */
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108 return;
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109 }
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110
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111 /* Our Stub routine to set up and then call the real routine. */
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112 pascal void TimerCallbackProc(TMTaskPtr tmTaskPtr)
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113 {
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114 Uint32 ms;
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115
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116 WakeUpProcess(&((ExtendedTimerPtr) tmTaskPtr)->taskPSN);
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117
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118 ms = SDL_alarm_callback(SDL_alarm_interval);
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119 if ( ms ) {
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120 SDL_alarm_interval = ROUND_RESOLUTION(ms);
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121 PrimeTime((QElemPtr)&gExtendedTimerRec.tmTask,
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122 SDL_alarm_interval);
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123 } else {
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124 SDL_alarm_interval = 0;
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125 }
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126 }
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127
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128 int SDL_SYS_StartTimer(void)
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129 {
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130 /*
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131 * Configure the global structure that stores the timing information.
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132 */
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133 gExtendedTimerRec.tmTask.qLink = NULL;
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134 gExtendedTimerRec.tmTask.qType = 0;
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135 gExtendedTimerRec.tmTask.tmAddr = NewTimerUPP(TimerCallbackProc);
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136 gExtendedTimerRec.tmTask.tmCount = 0;
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137 gExtendedTimerRec.tmTask.tmWakeUp = 0;
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138 gExtendedTimerRec.tmTask.tmReserved = 0;
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139 GetCurrentProcess(&gExtendedTimerRec.taskPSN);
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140
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141 /* Install the task record */
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142 InsXTime((QElemPtr)&gExtendedTimerRec.tmTask);
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143
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144 /* Go! */
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145 PrimeTime((QElemPtr)&gExtendedTimerRec.tmTask, SDL_alarm_interval);
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146 return(0);
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147 }
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148
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149 void SDL_SYS_StopTimer(void)
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150 {
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151 RmvTime((QElemPtr)&gExtendedTimerRec.tmTask);
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152 }
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