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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 #include "FastTimes.h" |
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38 |
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39 #if TARGET_API_MAC_CARBON |
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40 #define NewTimerProc NewTimerUPP |
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41 #endif |
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42 |
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43 #define MS_PER_TICK (1000.0/60.0) /* MacOS tick = 1/60 second */ |
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44 |
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45 |
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46 #define kTwoPower32 (4294967296.0) /* 2^32 */ |
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47 |
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48 static double start_tick; |
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49 static int is_fast_inited = 0; |
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50 |
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51 void SDL_StartTicks(void) |
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52 { |
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53 if ( ! is_fast_inited ) // important to check or FastTime may hang machine! |
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54 SDL_SYS_TimerInit(); |
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55 |
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56 start_tick = FastMicroseconds(); |
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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 |
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62 if ( ! is_fast_inited ) |
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63 SDL_SYS_TimerInit(); |
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64 |
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65 return FastMilliseconds(); |
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66 } |
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67 |
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68 void SDL_Delay(Uint32 ms) |
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69 { |
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70 Uint32 stop, now; |
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71 |
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72 stop = SDL_GetTicks() + ms; |
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73 do { |
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74 #if TARGET_API_MAC_CARBON |
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75 MPYield(); |
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76 #else |
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77 SystemTask(); |
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78 #endif |
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79 |
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80 now = SDL_GetTicks(); |
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81 |
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82 } while ( stop > now ); |
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83 } |
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84 |
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85 /* |
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86 void SDL_StartTicks(void) |
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87 { |
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88 // FIXME: Should we implement a wrapping algorithm, like Win32? |
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89 } |
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90 |
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91 Uint32 SDL_GetTicks(void) |
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92 { |
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93 UnsignedWide ms; |
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94 |
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95 Microseconds (&ms); |
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96 |
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97 return ( ms.lo / 1000 ); |
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98 } |
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99 |
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100 void SDL_Delay(Uint32 ms) |
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101 { |
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102 |
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103 UnsignedWide microsecs; |
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104 UInt32 stop; |
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105 |
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106 Microseconds (µsecs); |
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107 |
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108 stop = microsecs.lo + (ms * 1000); |
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109 |
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110 while ( stop > microsecs.lo ) { |
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111 |
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112 SystemTask (); |
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113 |
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114 Microseconds (µsecs); |
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115 } |
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116 |
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117 }*/ |
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118 |
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119 /* Data to handle a single periodic alarm */ |
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120 typedef struct _ExtendedTimerRec |
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121 { |
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122 TMTask tmTask; |
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123 ProcessSerialNumber taskPSN; |
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124 } ExtendedTimerRec, *ExtendedTimerPtr; |
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125 |
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126 static ExtendedTimerRec gExtendedTimerRec; |
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127 |
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128 |
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129 int SDL_SYS_TimerInit(void) |
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130 { |
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131 FastInitialize (); |
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132 is_fast_inited = 1; |
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133 |
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134 return(0); |
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135 } |
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136 |
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137 void SDL_SYS_TimerQuit(void) |
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138 { |
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139 /* We don't need a cleanup? */ |
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140 return; |
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141 } |
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142 |
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143 /* Our Stub routine to set up and then call the real routine. */ |
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144 pascal void TimerCallbackProc(TMTaskPtr tmTaskPtr) |
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145 { |
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146 Uint32 ms; |
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147 |
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148 WakeUpProcess(&((ExtendedTimerPtr) tmTaskPtr)->taskPSN); |
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149 |
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150 ms = SDL_alarm_callback(SDL_alarm_interval); |
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151 if ( ms ) { |
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152 SDL_alarm_interval = ROUND_RESOLUTION(ms); |
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153 PrimeTime((QElemPtr)&gExtendedTimerRec.tmTask, |
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154 SDL_alarm_interval); |
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155 } else { |
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156 SDL_alarm_interval = 0; |
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157 } |
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158 } |
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159 |
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160 int SDL_SYS_StartTimer(void) |
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161 { |
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162 /* |
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163 * Configure the global structure that stores the timing information. |
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164 */ |
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165 gExtendedTimerRec.tmTask.qLink = NULL; |
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166 gExtendedTimerRec.tmTask.qType = 0; |
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167 gExtendedTimerRec.tmTask.tmAddr = NewTimerProc(TimerCallbackProc); |
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168 gExtendedTimerRec.tmTask.tmCount = 0; |
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169 gExtendedTimerRec.tmTask.tmWakeUp = 0; |
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170 gExtendedTimerRec.tmTask.tmReserved = 0; |
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171 GetCurrentProcess(&gExtendedTimerRec.taskPSN); |
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172 |
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173 /* Install the task record */ |
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174 InsXTime((QElemPtr)&gExtendedTimerRec.tmTask); |
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175 |
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176 /* Go! */ |
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177 PrimeTime((QElemPtr)&gExtendedTimerRec.tmTask, SDL_alarm_interval); |
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178 return(0); |
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179 } |
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180 |
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181 void SDL_SYS_StopTimer(void) |
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182 { |
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183 RmvTime((QElemPtr)&gExtendedTimerRec.tmTask); |
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184 } |
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185 |
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186 #endif /* SDL_TIMER_MACOS */ |