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annotate src/timer/win32/SDL_systimer.c @ 3297:d430982cd5cc

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author Bob Pendleton <bob@pendleton.com>
date Mon, 21 Sep 2009 22:25:14 +0000
parents 99210400e8b9
children f7b03b6838cb
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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_WIN32
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25
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26 #define WIN32_LEAN_AND_MEAN
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27 #include <windows.h>
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28 #include <mmsystem.h>
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29
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30 #include "SDL_timer.h"
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31 #include "../SDL_timer_c.h"
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32
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33 #ifdef _WIN32_WCE
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34 #error This is WinCE. Please use src/timer/wince/SDL_systimer.c instead.
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35 #endif
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36
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37 #define TIME_WRAP_VALUE (~(DWORD)0)
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38
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39 /* The first (low-resolution) ticks value of the application */
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40 static DWORD start;
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41
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42 #ifndef USE_GETTICKCOUNT
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43 /* Store if a high-resolution performance counter exists on the system */
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44 static BOOL hires_timer_available;
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45 /* The first high-resolution ticks value of the application */
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46 static LARGE_INTEGER hires_start_ticks;
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47 /* The number of ticks per second of the high-resolution performance counter */
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48 static LARGE_INTEGER hires_ticks_per_second;
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49 #endif
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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 /* Set first ticks value */
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55 #ifdef USE_GETTICKCOUNT
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56 start = GetTickCount();
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57 #else
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58 #if 0 /* Apparently there are problems with QPC on Win2K */
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59 if (QueryPerformanceFrequency(&hires_ticks_per_second) == TRUE) {
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60 hires_timer_available = TRUE;
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61 QueryPerformanceCounter(&hires_start_ticks);
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62 } else
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63 #endif
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64 {
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65 hires_timer_available = FALSE;
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66 timeBeginPeriod(1); /* use 1 ms timer precision */
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67 start = timeGetTime();
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68 }
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69 #endif
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70 }
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71
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72 Uint32
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73 SDL_GetTicks(void)
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74 {
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75 DWORD now, ticks;
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76 #ifndef USE_GETTICKCOUNT
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77 LARGE_INTEGER hires_now;
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78 #endif
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79
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80 #ifdef USE_GETTICKCOUNT
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81 now = GetTickCount();
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82 #else
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83 if (hires_timer_available) {
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84 QueryPerformanceCounter(&hires_now);
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85
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86 hires_now.QuadPart -= hires_start_ticks.QuadPart;
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87 hires_now.QuadPart *= 1000;
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88 hires_now.QuadPart /= hires_ticks_per_second.QuadPart;
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89
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90 return (DWORD) hires_now.QuadPart;
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91 } else {
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92 now = timeGetTime();
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93 }
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94 #endif
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96 if (now < start) {
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97 ticks = (TIME_WRAP_VALUE - start) + now;
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98 } else {
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99 ticks = (now - start);
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100 }
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101 return (ticks);
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102 }
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103
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104 void
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105 SDL_Delay(Uint32 ms)
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106 {
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107 Sleep(ms);
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108 }
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109
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110 /* Data to handle a single periodic alarm */
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111 static UINT timerID = 0;
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112
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113 static void CALLBACK
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114 HandleAlarm(UINT uID, UINT uMsg, DWORD_PTR dwUser,
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115 DWORD_PTR dw1, DWORD_PTR dw2)
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116 {
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117 SDL_ThreadedTimerCheck();
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118 }
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119
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120
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121 int
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122 SDL_SYS_TimerInit(void)
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123 {
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124 MMRESULT result;
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125
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126 /* Set timer resolution */
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127 result = timeBeginPeriod(TIMER_RESOLUTION);
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128 if (result != TIMERR_NOERROR) {
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129 SDL_SetError("Warning: Can't set %d ms timer resolution",
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130 TIMER_RESOLUTION);
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131 }
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132 /* Allow 10 ms of drift so we don't chew on CPU */
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133 timerID =
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134 timeSetEvent(TIMER_RESOLUTION, 1, HandleAlarm, 0, TIME_PERIODIC);
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135 if (!timerID) {
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136 SDL_SetError("timeSetEvent() failed");
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137 return (-1);
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138 }
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139 return (SDL_SetTimerThreaded(1));
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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 if (timerID) {
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146 timeKillEvent(timerID);
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147 }
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148 timeEndPeriod(TIMER_RESOLUTION);
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149 }
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150
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151 int
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152 SDL_SYS_StartTimer(void)
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153 {
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154 SDL_SetError("Internal logic error: Win32 uses threaded timer");
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155 return (-1);
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156 }
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157
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158 void
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159 SDL_SYS_StopTimer(void)
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160 {
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161 return;
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162 }
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163
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164 #endif /* SDL_TIMER_WIN32 */
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165 /* vi: set ts=4 sw=4 expandtab: */