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annotate src/timer/macos/SDL_MPWtimer.c @ 1905:36d52b1f0504

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Prefer the D3D renderer over GDI, at least for testing. Added support for the SDL_VIDEO_RENDERER environment variable to pick the desired render driver. Implemented WritePixels support for the D3D renderer.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 14 Jul 2006 08:22:45 +0000
parents c121d94672cb
children
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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
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48 SDL_StartTicks(void)
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49 {
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50 #ifdef USE_MICROSECONDS
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51 UnsignedWide now;
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52
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53 Microseconds(&now);
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54 start = WideTo64bit(now);
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55 #else
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56 /* FIXME: Should we implement a wrapping algorithm, like Win32? */
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57 #endif
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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 #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
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74 SDL_Delay(Uint32 ms)
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75 {
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76 #ifdef USE_MICROSECONDS
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77 Uint32 end_ms;
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78
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79 end_ms = SDL_GetTicks() + ms;
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80 do {
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81 /* FIXME: Yield CPU? */ ;
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82 }
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83 while (SDL_GetTicks() < end_ms);
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84 #else
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85 UInt32 unused; /* MJS */
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86 Delay(ms / MS_PER_TICK, &unused);
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87 #endif
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88 }
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89
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90
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91 /* Data to handle a single periodic alarm */
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92 typedef struct _ExtendedTimerRec
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93 {
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94 TMTask tmTask;
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95 ProcessSerialNumber taskPSN;
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96 } ExtendedTimerRec, *ExtendedTimerPtr;
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97
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98 static ExtendedTimerRec gExtendedTimerRec;
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99
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100
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101 int
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102 SDL_SYS_TimerInit(void)
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103 {
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104 /* We don't need a setup? */
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105 return (0);
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106 }
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107
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108 void
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109 SDL_SYS_TimerQuit(void)
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110 {
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111 /* We don't need a cleanup? */
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112 return;
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113 }
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114
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115 /* Our Stub routine to set up and then call the real routine. */
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116 pascal void
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117 TimerCallbackProc(TMTaskPtr tmTaskPtr)
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118 {
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119 Uint32 ms;
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120
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121 WakeUpProcess(&((ExtendedTimerPtr) tmTaskPtr)->taskPSN);
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122
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123 ms = SDL_alarm_callback(SDL_alarm_interval);
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124 if (ms) {
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125 SDL_alarm_interval = ROUND_RESOLUTION(ms);
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126 PrimeTime((QElemPtr) & gExtendedTimerRec.tmTask, SDL_alarm_interval);
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127 } else {
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128 SDL_alarm_interval = 0;
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129 }
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130 }
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131
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132 int
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133 SDL_SYS_StartTimer(void)
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134 {
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135 /*
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136 * Configure the global structure that stores the timing information.
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137 */
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138 gExtendedTimerRec.tmTask.qLink = NULL;
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139 gExtendedTimerRec.tmTask.qType = 0;
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140 gExtendedTimerRec.tmTask.tmAddr = NewTimerUPP(TimerCallbackProc);
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141 gExtendedTimerRec.tmTask.tmCount = 0;
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142 gExtendedTimerRec.tmTask.tmWakeUp = 0;
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143 gExtendedTimerRec.tmTask.tmReserved = 0;
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144 GetCurrentProcess(&gExtendedTimerRec.taskPSN);
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145
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146 /* Install the task record */
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147 InsXTime((QElemPtr) & gExtendedTimerRec.tmTask);
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148
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149 /* Go! */
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150 PrimeTime((QElemPtr) & gExtendedTimerRec.tmTask, SDL_alarm_interval);
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151 return (0);
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152 }
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153
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154 void
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155 SDL_SYS_StopTimer(void)
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156 {
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157 RmvTime((QElemPtr) & gExtendedTimerRec.tmTask);
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158 }
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159
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160 #endif /* SDL_TIMER_MACOS */
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161 /* vi: set ts=4 sw=4 expandtab: */