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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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18 |
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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_MACOS |
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25 |
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26 #include <Types.h> |
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27 #include <Timer.h> |
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28 #include <OSUtils.h> |
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29 #include <Gestalt.h> |
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30 #include <Processes.h> |
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31 |
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32 #include <LowMem.h> |
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33 |
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34 #include "SDL_timer.h" |
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35 #include "../SDL_timer_c.h" |
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36 |
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37 #define MS_PER_TICK (1000/60) /* MacOS tick = 1/60 second */ |
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38 |
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39 /* Note: This is only a step above the original 1/60s implementation. |
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40 * For a good implementation, see FastTimes.[ch], by Matt Slot. |
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41 */ |
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42 #define USE_MICROSECONDS |
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43 #define WideTo64bit(w) (*(UInt64 *) &(w)) |
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44 |
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45 UInt64 start; |
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46 |
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47 void SDL_StartTicks(void) |
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48 { |
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49 #ifdef USE_MICROSECONDS |
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50 UnsignedWide now; |
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51 |
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52 Microseconds(&now); |
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53 start = WideTo64bit(now); |
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54 #else |
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55 /* FIXME: Should we implement a wrapping algorithm, like Win32? */ |
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56 #endif |
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57 } |
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58 |
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59 Uint32 SDL_GetTicks(void) |
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60 { |
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61 #ifdef USE_MICROSECONDS |
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62 UnsignedWide now; |
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63 |
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64 Microseconds(&now); |
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65 return (Uint32)((WideTo64bit(now)-start)/1000); |
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66 #else |
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67 return(LMGetTicks()*MS_PER_TICK); |
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68 #endif |
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69 } |
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70 |
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71 void SDL_Delay(Uint32 ms) |
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72 { |
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73 #ifdef USE_MICROSECONDS |
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74 Uint32 end_ms; |
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75 |
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76 end_ms = SDL_GetTicks() + ms; |
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77 do { |
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78 /* FIXME: Yield CPU? */ ; |
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79 } while ( SDL_GetTicks() < end_ms ); |
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80 #else |
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81 UInt32 unused; /* MJS */ |
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82 Delay(ms/MS_PER_TICK, &unused); |
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83 #endif |
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84 } |
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85 |
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86 |
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87 /* Data to handle a single periodic alarm */ |
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88 typedef struct _ExtendedTimerRec |
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89 { |
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90 TMTask tmTask; |
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91 ProcessSerialNumber taskPSN; |
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92 } ExtendedTimerRec, *ExtendedTimerPtr; |
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93 |
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94 static ExtendedTimerRec gExtendedTimerRec; |
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95 |
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96 |
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97 int SDL_SYS_TimerInit(void) |
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98 { |
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99 /* We don't need a setup? */ |
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100 return(0); |
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101 } |
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102 |
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103 void SDL_SYS_TimerQuit(void) |
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104 { |
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105 /* We don't need a cleanup? */ |
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106 return; |
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107 } |
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108 |
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109 /* Our Stub routine to set up and then call the real routine. */ |
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110 pascal void TimerCallbackProc(TMTaskPtr tmTaskPtr) |
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111 { |
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112 Uint32 ms; |
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113 |
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114 WakeUpProcess(&((ExtendedTimerPtr) tmTaskPtr)->taskPSN); |
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115 |
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116 ms = SDL_alarm_callback(SDL_alarm_interval); |
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117 if ( ms ) { |
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118 SDL_alarm_interval = ROUND_RESOLUTION(ms); |
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119 PrimeTime((QElemPtr)&gExtendedTimerRec.tmTask, |
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120 SDL_alarm_interval); |
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121 } else { |
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122 SDL_alarm_interval = 0; |
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123 } |
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124 } |
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125 |
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126 int SDL_SYS_StartTimer(void) |
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127 { |
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128 /* |
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129 * Configure the global structure that stores the timing information. |
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130 */ |
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131 gExtendedTimerRec.tmTask.qLink = NULL; |
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132 gExtendedTimerRec.tmTask.qType = 0; |
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133 gExtendedTimerRec.tmTask.tmAddr = NewTimerUPP(TimerCallbackProc); |
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134 gExtendedTimerRec.tmTask.tmCount = 0; |
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135 gExtendedTimerRec.tmTask.tmWakeUp = 0; |
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136 gExtendedTimerRec.tmTask.tmReserved = 0; |
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137 GetCurrentProcess(&gExtendedTimerRec.taskPSN); |
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138 |
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139 /* Install the task record */ |
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140 InsXTime((QElemPtr)&gExtendedTimerRec.tmTask); |
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141 |
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142 /* Go! */ |
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143 PrimeTime((QElemPtr)&gExtendedTimerRec.tmTask, SDL_alarm_interval); |
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144 return(0); |
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145 } |
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146 |
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147 void SDL_SYS_StopTimer(void) |
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148 { |
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149 RmvTime((QElemPtr)&gExtendedTimerRec.tmTask); |
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150 } |
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151 |
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152 #endif /* SDL_TIMER_MACOS */ |