annotate src/timer/win32/SDL_systimer.c @ 252:e8157fcb3114

Updated the source with the correct e-mail address
author Sam Lantinga <slouken@libsdl.org>
date Fri, 14 Dec 2001 12:38:15 +0000
parents 69b8fac3e1c0
children f6ffac90895c
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, 1998, 1999, 2000, 2001 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
252
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20 slouken@libsdl.org
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 #include <windows.h>
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29 #include <mmsystem.h>
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30
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31 #include "SDL_timer.h"
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32 #include "SDL_timer_c.h"
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33 #include "SDL_error.h"
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34
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35 #ifdef _WIN32_WCE
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36 #define USE_GETTICKCOUNT
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37 #define USE_SETTIMER
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38 #endif
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39
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40 #define TIME_WRAP_VALUE (~(DWORD)0)
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41
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42 /* The first (low-resolution) ticks value of the application */
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43 static DWORD start;
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44
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45 #ifndef USE_GETTICKCOUNT
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46 /* Store if a high-resolution performance counter exists on the system */
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47 static BOOL hires_timer_available;
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48 /* The first high-resolution ticks value of the application */
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49 static LARGE_INTEGER hires_start_ticks;
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50 /* The number of ticks per second of the high-resolution performance counter */
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51 static LARGE_INTEGER hires_ticks_per_second;
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52 #endif
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53
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54 void SDL_StartTicks(void)
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55 {
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56 /* Set first ticks value */
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57 #ifdef USE_GETTICKCOUNT
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58 start = GetTickCount();
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59 #else
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60 if (QueryPerformanceFrequency(&hires_ticks_per_second) == TRUE)
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61 {
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62 hires_timer_available = TRUE;
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63 QueryPerformanceCounter(&hires_start_ticks);
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64 }
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65 else
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66 {
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67 hires_timer_available = FALSE;
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68 timeBeginPeriod(1); /* use 1 ms timer precision */
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69 start = timeGetTime();
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70 }
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71 #endif
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72 }
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73
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74 Uint32 SDL_GetTicks(void)
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75 {
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76 DWORD now, ticks;
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77 #ifndef USE_GETTICKCOUNT
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78 LARGE_INTEGER hires_now;
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79 #endif
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80
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81 #ifdef USE_GETTICKCOUNT
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82 now = GetTickCount();
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83 #else
89
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84 if (hires_timer_available)
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85 {
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86 QueryPerformanceCounter(&hires_now);
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87
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88 hires_now.QuadPart -= hires_start_ticks.QuadPart;
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89 hires_now.QuadPart *= 1000;
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90 hires_now.QuadPart /= hires_ticks_per_second.QuadPart;
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91
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92 return (DWORD)hires_now.QuadPart;
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93 }
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94 else
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95 {
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96 now = timeGetTime();
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97 }
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98 #endif
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99
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100 if ( now < start ) {
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101 ticks = (TIME_WRAP_VALUE-start) + now;
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102 } else {
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103 ticks = (now - start);
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104 }
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105 return(ticks);
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106 }
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107
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108 void SDL_Delay(Uint32 ms)
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109 {
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110 Sleep(ms);
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111 }
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112
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113 #ifdef USE_SETTIMER
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114
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115 static UINT WIN_timer;
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116
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117 int SDL_SYS_TimerInit(void)
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118 {
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119 return(0);
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120 }
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121
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122 void SDL_SYS_TimerQuit(void)
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123 {
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124 return;
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125 }
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126
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127 /* Forward declaration because this is called by the timer callback */
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128 int SDL_SYS_StartTimer(void);
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129
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130 static VOID CALLBACK TimerCallbackProc(HWND hwnd, UINT uMsg, UINT idEvent, DWORD dwTime)
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131 {
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132 Uint32 ms;
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133
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134 ms = SDL_alarm_callback(SDL_alarm_interval);
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135 if ( ms != SDL_alarm_interval ) {
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136 KillTimer(NULL, idEvent);
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137 if ( ms ) {
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138 SDL_alarm_interval = ROUND_RESOLUTION(ms);
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139 SDL_SYS_StartTimer();
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140 } else {
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141 SDL_alarm_interval = 0;
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142 }
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143 }
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144 }
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145
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146 int SDL_SYS_StartTimer(void)
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147 {
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148 int retval;
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149
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150 WIN_timer = SetTimer(NULL, 0, SDL_alarm_interval, TimerCallbackProc);
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151 if ( WIN_timer ) {
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152 retval = 0;
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153 } else {
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154 retval = -1;
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155 }
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156 return retval;
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157 }
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158
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159 void SDL_SYS_StopTimer(void)
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160 {
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161 if ( WIN_timer ) {
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162 KillTimer(NULL, WIN_timer);
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163 WIN_timer = 0;
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164 }
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165 }
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166
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167 #else /* !USE_SETTIMER */
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168
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169 /* Data to handle a single periodic alarm */
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170 static UINT timerID = 0;
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171
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172 static void CALLBACK HandleAlarm(UINT uID, UINT uMsg, DWORD dwUser,
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173 DWORD dw1, DWORD dw2)
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174 {
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175 SDL_ThreadedTimerCheck();
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176 }
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177
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178
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179 int SDL_SYS_TimerInit(void)
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180 {
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181 MMRESULT result;
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182
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183 /* Set timer resolution */
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184 result = timeBeginPeriod(TIMER_RESOLUTION);
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185 if ( result != TIMERR_NOERROR ) {
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186 SDL_SetError("Warning: Can't set %d ms timer resolution",
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187 TIMER_RESOLUTION);
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188 }
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189 /* Allow 10 ms of drift so we don't chew on CPU */
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190 timerID = timeSetEvent(TIMER_RESOLUTION,1,HandleAlarm,0,TIME_PERIODIC);
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191 if ( ! timerID ) {
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192 SDL_SetError("timeSetEvent() failed");
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193 return(-1);
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194 }
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195 return(SDL_SetTimerThreaded(1));
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196 }
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197
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198 void SDL_SYS_TimerQuit(void)
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199 {
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200 if ( timerID ) {
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201 timeKillEvent(timerID);
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202 }
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203 timeEndPeriod(TIMER_RESOLUTION);
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204 }
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205
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206 int SDL_SYS_StartTimer(void)
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207 {
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208 SDL_SetError("Internal logic error: Win32 uses threaded timer");
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209 return(-1);
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210 }
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211
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212 void SDL_SYS_StopTimer(void)
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213 {
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214 return;
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215 }
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216
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217 #endif /* USE_SETTIMER */