annotate src/timer/win32/SDL_systimer.c @ 453:a6fa62b1be09

Updated for embedded Visual C++ 4.0
author Sam Lantinga <slouken@libsdl.org>
date Tue, 20 Aug 2002 00:20:06 +0000
parents 72d55d02cb47
children 621ab54c1dde
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, 2002 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
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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 0 /* Apparently there are problems with QPC on Win2K */
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61 if (QueryPerformanceFrequency(&hires_ticks_per_second) == TRUE)
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62 {
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63 hires_timer_available = TRUE;
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64 QueryPerformanceCounter(&hires_start_ticks);
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65 }
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66 else
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67 #endif
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68 {
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69 hires_timer_available = FALSE;
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70 timeBeginPeriod(1); /* use 1 ms timer precision */
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71 start = timeGetTime();
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72 }
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73 #endif
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74 }
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75
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76 Uint32 SDL_GetTicks(void)
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77 {
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78 DWORD now, ticks;
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79 #ifndef USE_GETTICKCOUNT
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80 LARGE_INTEGER hires_now;
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81 #endif
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82
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83 #ifdef USE_GETTICKCOUNT
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84 now = GetTickCount();
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85 #else
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86 if (hires_timer_available)
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87 {
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88 QueryPerformanceCounter(&hires_now);
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90 hires_now.QuadPart -= hires_start_ticks.QuadPart;
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91 hires_now.QuadPart *= 1000;
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92 hires_now.QuadPart /= hires_ticks_per_second.QuadPart;
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93
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94 return (DWORD)hires_now.QuadPart;
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95 }
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96 else
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97 {
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98 now = timeGetTime();
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99 }
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100 #endif
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101
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102 if ( now < start ) {
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103 ticks = (TIME_WRAP_VALUE-start) + now;
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104 } else {
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105 ticks = (now - start);
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106 }
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107 return(ticks);
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108 }
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109
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110 void SDL_Delay(Uint32 ms)
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111 {
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112 Sleep(ms);
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113 }
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114
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115 #ifdef USE_SETTIMER
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116
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117 static UINT WIN_timer;
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118
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119 int SDL_SYS_TimerInit(void)
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120 {
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121 return(0);
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122 }
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123
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124 void SDL_SYS_TimerQuit(void)
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125 {
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126 return;
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127 }
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128
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129 /* Forward declaration because this is called by the timer callback */
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130 int SDL_SYS_StartTimer(void);
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131
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132 static VOID CALLBACK TimerCallbackProc(HWND hwnd, UINT uMsg, UINT idEvent, DWORD dwTime)
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133 {
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134 Uint32 ms;
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135
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136 ms = SDL_alarm_callback(SDL_alarm_interval);
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137 if ( ms != SDL_alarm_interval ) {
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138 KillTimer(NULL, idEvent);
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139 if ( ms ) {
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140 SDL_alarm_interval = ROUND_RESOLUTION(ms);
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141 SDL_SYS_StartTimer();
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142 } else {
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143 SDL_alarm_interval = 0;
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144 }
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145 }
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146 }
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147
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148 int SDL_SYS_StartTimer(void)
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149 {
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150 int retval;
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151
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152 WIN_timer = SetTimer(NULL, 0, SDL_alarm_interval, TimerCallbackProc);
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153 if ( WIN_timer ) {
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154 retval = 0;
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155 } else {
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156 retval = -1;
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157 }
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158 return retval;
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159 }
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160
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161 void SDL_SYS_StopTimer(void)
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162 {
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163 if ( WIN_timer ) {
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164 KillTimer(NULL, WIN_timer);
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165 WIN_timer = 0;
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166 }
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167 }
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168
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169 #else /* !USE_SETTIMER */
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170
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171 /* Data to handle a single periodic alarm */
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172 static UINT timerID = 0;
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173
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174 static void CALLBACK HandleAlarm(UINT uID, UINT uMsg, DWORD dwUser,
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175 DWORD dw1, DWORD dw2)
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176 {
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177 SDL_ThreadedTimerCheck();
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178 }
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179
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180
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181 int SDL_SYS_TimerInit(void)
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182 {
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183 MMRESULT result;
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184
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185 /* Set timer resolution */
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186 result = timeBeginPeriod(TIMER_RESOLUTION);
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187 if ( result != TIMERR_NOERROR ) {
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188 SDL_SetError("Warning: Can't set %d ms timer resolution",
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189 TIMER_RESOLUTION);
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190 }
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191 /* Allow 10 ms of drift so we don't chew on CPU */
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192 timerID = timeSetEvent(TIMER_RESOLUTION,1,HandleAlarm,0,TIME_PERIODIC);
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193 if ( ! timerID ) {
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194 SDL_SetError("timeSetEvent() failed");
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195 return(-1);
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196 }
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197 return(SDL_SetTimerThreaded(1));
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198 }
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199
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200 void SDL_SYS_TimerQuit(void)
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201 {
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202 if ( timerID ) {
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203 timeKillEvent(timerID);
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204 }
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205 timeEndPeriod(TIMER_RESOLUTION);
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206 }
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207
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208 int SDL_SYS_StartTimer(void)
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209 {
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210 SDL_SetError("Internal logic error: Win32 uses threaded timer");
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211 return(-1);
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212 }
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213
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214 void SDL_SYS_StopTimer(void)
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215 {
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216 return;
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217 }
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218
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219 #endif /* USE_SETTIMER */