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annotate src/timer/macos/SDL_systimer.c @ 1675:d33dcfc3fde7 SDL-1.3

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Overlay functions are being replaced by YUV textures. If the driver doesn't support YUV textures, they can be emulated by backing the texture with an RGB texture and using the software conversion routines. Note that it doesn't make sense to lock a portion of a YV12 texture, since you'd need to return three pixel pointers and pitch values instead of the one that's available through the API. I'm guessing that's one of the reasons DirectX 9 doesn't support this format at all.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 11 Jun 2006 07:30:16 +0000
parents 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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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
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52 SDL_StartTicks(void)
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53 {
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54 if (!is_fast_inited) // important to check or FastTime may hang machine!
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55 SDL_SYS_TimerInit();
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56
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57 start_tick = FastMicroseconds();
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58 }
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59
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60 Uint32
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61 SDL_GetTicks(void)
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62 {
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63
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64 if (!is_fast_inited)
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65 SDL_SYS_TimerInit();
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66
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67 return FastMilliseconds();
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68 }
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69
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70 void
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71 SDL_Delay(Uint32 ms)
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72 {
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73 Uint32 stop, now;
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74
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75 stop = SDL_GetTicks() + ms;
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76 do {
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77 #if TARGET_API_MAC_CARBON
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78 MPYield();
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79 #else
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80 SystemTask();
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81 #endif
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82
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83 now = SDL_GetTicks();
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84
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85 }
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86 while (stop > now);
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87 }
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88
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89 /*
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90 void SDL_StartTicks(void)
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91 {
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92 // FIXME: Should we implement a wrapping algorithm, like Win32?
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93 }
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94
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95 Uint32 SDL_GetTicks(void)
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96 {
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97 UnsignedWide ms;
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98
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99 Microseconds (&ms);
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100
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101 return ( ms.lo / 1000 );
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102 }
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103
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104 void SDL_Delay(Uint32 ms)
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105 {
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106
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107 UnsignedWide microsecs;
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108 UInt32 stop;
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109
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110 Microseconds (&microsecs);
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111
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112 stop = microsecs.lo + (ms * 1000);
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113
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114 while ( stop > microsecs.lo ) {
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115
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116 SystemTask ();
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117
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118 Microseconds (&microsecs);
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119 }
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120
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121 }*/
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122
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123 /* Data to handle a single periodic alarm */
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124 typedef struct _ExtendedTimerRec
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125 {
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126 TMTask tmTask;
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127 ProcessSerialNumber taskPSN;
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128 } ExtendedTimerRec, *ExtendedTimerPtr;
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129
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130 static ExtendedTimerRec gExtendedTimerRec;
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131
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132
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133 int
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134 SDL_SYS_TimerInit(void)
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135 {
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136 FastInitialize();
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137 is_fast_inited = 1;
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138
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139 return (0);
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140 }
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141
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142 void
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143 SDL_SYS_TimerQuit(void)
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144 {
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145 /* We don't need a cleanup? */
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146 return;
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147 }
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148
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149 /* Our Stub routine to set up and then call the real routine. */
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150 pascal void
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151 TimerCallbackProc(TMTaskPtr tmTaskPtr)
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152 {
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153 Uint32 ms;
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154
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155 WakeUpProcess(&((ExtendedTimerPtr) tmTaskPtr)->taskPSN);
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156
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157 ms = SDL_alarm_callback(SDL_alarm_interval);
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158 if (ms) {
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159 SDL_alarm_interval = ROUND_RESOLUTION(ms);
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160 PrimeTime((QElemPtr) & gExtendedTimerRec.tmTask, SDL_alarm_interval);
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161 } else {
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162 SDL_alarm_interval = 0;
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163 }
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164 }
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165
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166 int
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167 SDL_SYS_StartTimer(void)
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168 {
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169 /*
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170 * Configure the global structure that stores the timing information.
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171 */
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172 gExtendedTimerRec.tmTask.qLink = NULL;
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173 gExtendedTimerRec.tmTask.qType = 0;
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174 gExtendedTimerRec.tmTask.tmAddr = NewTimerProc(TimerCallbackProc);
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175 gExtendedTimerRec.tmTask.tmCount = 0;
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176 gExtendedTimerRec.tmTask.tmWakeUp = 0;
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177 gExtendedTimerRec.tmTask.tmReserved = 0;
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178 GetCurrentProcess(&gExtendedTimerRec.taskPSN);
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179
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180 /* Install the task record */
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181 InsXTime((QElemPtr) & gExtendedTimerRec.tmTask);
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182
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183 /* Go! */
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184 PrimeTime((QElemPtr) & gExtendedTimerRec.tmTask, SDL_alarm_interval);
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185 return (0);
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186 }
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187
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188 void
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189 SDL_SYS_StopTimer(void)
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190 {
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191 RmvTime((QElemPtr) & gExtendedTimerRec.tmTask);
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192 }
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193
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194 #endif /* SDL_TIMER_MACOS */
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195 /* vi: set ts=4 sw=4 expandtab: */