Mercurial > sdl-ios-xcode

annotate src/timer/windows/SDL_systimer.c @ 5092:327f181542f1

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Include windows.h in a single point in the source, so we can be consistent about the definition of UNICODE and have core utility functions for Windows that all modules can share. I think this also fixes the bug relating to non-latin characters in filenames, since UNICODE wasn't defined in SDL_rwops.c
author Sam Lantinga <slouken@libsdl.org>
date Mon, 24 Jan 2011 21:20:30 -0800
parents e8916fe9cfc8
children 481dabb098ef
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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_WINDOWS
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25
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26 #include "../../core/windows/SDL_windows.h"
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27 #include <mmsystem.h>
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28
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29 #include "SDL_timer.h"
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30 #include "../SDL_timer_c.h"
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31
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32 #ifdef _WIN32_WCE
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33 #error This is WinCE. Please use src/timer/wince/SDL_systimer.c instead.
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34 #endif
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35
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36 #define TIME_WRAP_VALUE (~(DWORD)0)
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37
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38 /* The first (low-resolution) ticks value of the application */
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39 static DWORD start;
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40
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41 #ifndef USE_GETTICKCOUNT
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42 /* Store if a high-resolution performance counter exists on the system */
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43 static BOOL hires_timer_available;
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44 /* The first high-resolution ticks value of the application */
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45 static LARGE_INTEGER hires_start_ticks;
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46 /* The number of ticks per second of the high-resolution performance counter */
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47 static LARGE_INTEGER hires_ticks_per_second;
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48 #endif
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49
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50 void
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51 SDL_StartTicks(void)
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52 {
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53 /* Set first ticks value */
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54 #ifdef USE_GETTICKCOUNT
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55 start = GetTickCount();
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56 #else
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57 #if 0 /* Apparently there are problems with QPC on Win2K */
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58 if (QueryPerformanceFrequency(&hires_ticks_per_second) == TRUE) {
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59 hires_timer_available = TRUE;
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60 QueryPerformanceCounter(&hires_start_ticks);
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61 } else
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62 #endif
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63 {
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64 hires_timer_available = FALSE;
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65 timeBeginPeriod(1); /* use 1 ms timer precision */
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66 start = timeGetTime();
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67 }
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68 #endif
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69 }
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70
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71 Uint32
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72 SDL_GetTicks(void)
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73 {
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74 DWORD now, ticks;
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75 #ifndef USE_GETTICKCOUNT
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76 LARGE_INTEGER hires_now;
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77 #endif
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78
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79 #ifdef USE_GETTICKCOUNT
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80 now = GetTickCount();
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81 #else
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82 if (hires_timer_available) {
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83 QueryPerformanceCounter(&hires_now);
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84
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85 hires_now.QuadPart -= hires_start_ticks.QuadPart;
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86 hires_now.QuadPart *= 1000;
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87 hires_now.QuadPart /= hires_ticks_per_second.QuadPart;
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88
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89 return (DWORD) hires_now.QuadPart;
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90 } else {
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91 now = timeGetTime();
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92 }
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93 #endif
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94
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95 if (now < start) {
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96 ticks = (TIME_WRAP_VALUE - start) + now;
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97 } else {
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98 ticks = (now - start);
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99 }
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100 return (ticks);
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101 }
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102
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103 void
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104 SDL_Delay(Uint32 ms)
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105 {
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106 Sleep(ms);
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107 }
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108
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109 /* Data to handle a single periodic alarm */
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110 static UINT timerID = 0;
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111
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112 static void CALLBACK
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113 HandleAlarm(UINT uID, UINT uMsg, DWORD_PTR dwUser,
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114 DWORD_PTR dw1, DWORD_PTR dw2)
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115 {
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116 SDL_ThreadedTimerCheck();
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117 }
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118
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119
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120 int
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121 SDL_SYS_TimerInit(void)
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122 {
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123 MMRESULT result;
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124
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125 /* Set timer resolution */
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126 result = timeBeginPeriod(TIMER_RESOLUTION);
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127 if (result != TIMERR_NOERROR) {
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128 SDL_SetError("Warning: Can't set %d ms timer resolution",
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129 TIMER_RESOLUTION);
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130 }
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131 /* Allow 10 ms of drift so we don't chew on CPU */
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132 timerID =
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133 timeSetEvent(TIMER_RESOLUTION, 1, HandleAlarm, 0, TIME_PERIODIC);
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134 if (!timerID) {
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135 SDL_SetError("timeSetEvent() failed");
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136 return (-1);
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137 }
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138 return (SDL_SetTimerThreaded(1));
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139 }
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140
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141 void
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142 SDL_SYS_TimerQuit(void)
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143 {
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144 if (timerID) {
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145 timeKillEvent(timerID);
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146 }
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147 timeEndPeriod(TIMER_RESOLUTION);
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148 }
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149
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150 int
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151 SDL_SYS_StartTimer(void)
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152 {
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153 SDL_SetError("Internal logic error: Win32 uses threaded timer");
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154 return (-1);
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155 }
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156
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157 void
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158 SDL_SYS_StopTimer(void)
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159 {
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160 return;
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161 }
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162
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163 #endif /* SDL_TIMER_WINDOWS */
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164
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165 /* vi: set ts=4 sw=4 expandtab: */