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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
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20 slouken@devolution.com
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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 ticks value of the application */
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43 static DWORD start;
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44
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45 void SDL_StartTicks(void)
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46 {
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47 /* Set first ticks value */
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48 #ifdef USE_GETTICKCOUNT
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49 start = GetTickCount();
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50 #else
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51 start = timeGetTime();
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52 #endif
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53 }
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54
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55 Uint32 SDL_GetTicks(void)
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56 {
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57 DWORD now, ticks;
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58
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59 #ifdef USE_GETTICKCOUNT
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60 now = GetTickCount();
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61 #else
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62 now = timeGetTime();
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63 #endif
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64 if ( now < start ) {
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65 ticks = (TIME_WRAP_VALUE-start) + now;
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66 } else {
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67 ticks = (now - start);
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68 }
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69 return(ticks);
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70 }
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71
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72 void SDL_Delay(Uint32 ms)
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73 {
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74 Sleep(ms);
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75 }
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76
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77 #ifdef USE_SETTIMER
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78
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79 static UINT WIN_timer;
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80
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81 int SDL_SYS_TimerInit(void)
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82 {
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83 return(0);
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84 }
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85
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86 void SDL_SYS_TimerQuit(void)
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87 {
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88 return;
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89 }
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90
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91 /* Forward declaration because this is called by the timer callback */
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92 int SDL_SYS_StartTimer(void);
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93
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94 static VOID CALLBACK TimerCallbackProc(HWND hwnd, UINT uMsg, UINT idEvent, DWORD dwTime)
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95 {
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96 Uint32 ms;
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97
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98 ms = SDL_alarm_callback(SDL_alarm_interval);
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99 if ( ms != SDL_alarm_interval ) {
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100 KillTimer(NULL, idEvent);
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101 if ( ms ) {
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102 SDL_alarm_interval = ROUND_RESOLUTION(ms);
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103 SDL_SYS_StartTimer();
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104 } else {
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105 SDL_alarm_interval = 0;
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106 }
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107 }
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108 }
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109
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110 int SDL_SYS_StartTimer(void)
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111 {
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112 int retval;
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113
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114 WIN_timer = SetTimer(NULL, 0, SDL_alarm_interval, TimerCallbackProc);
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115 if ( WIN_timer ) {
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116 retval = 0;
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117 } else {
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118 retval = -1;
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119 }
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120 return retval;
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121 }
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122
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123 void SDL_SYS_StopTimer(void)
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124 {
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125 if ( WIN_timer ) {
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126 KillTimer(NULL, WIN_timer);
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127 WIN_timer = 0;
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128 }
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129 }
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130
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131 #else /* !USE_SETTIMER */
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132
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133 /* Data to handle a single periodic alarm */
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134 static UINT timerID = 0;
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135
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136 static void CALLBACK HandleAlarm(UINT uID, UINT uMsg, DWORD dwUser,
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137 DWORD dw1, DWORD dw2)
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138 {
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139 SDL_ThreadedTimerCheck();
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140 }
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141
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142
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143 int SDL_SYS_TimerInit(void)
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144 {
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145 MMRESULT result;
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146
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147 /* Set timer resolution */
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148 result = timeBeginPeriod(TIMER_RESOLUTION);
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149 if ( result != TIMERR_NOERROR ) {
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150 SDL_SetError("Warning: Can't set %d ms timer resolution",
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151 TIMER_RESOLUTION);
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152 }
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153 /* Allow 10 ms of drift so we don't chew on CPU */
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154 timerID = timeSetEvent(TIMER_RESOLUTION,1,HandleAlarm,0,TIME_PERIODIC);
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155 if ( ! timerID ) {
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156 SDL_SetError("timeSetEvent() failed");
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157 return(-1);
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158 }
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159 return(SDL_SetTimerThreaded(1));
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160 }
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161
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162 void SDL_SYS_TimerQuit(void)
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163 {
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164 if ( timerID ) {
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165 timeKillEvent(timerID);
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166 }
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167 timeEndPeriod(TIMER_RESOLUTION);
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168 }
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169
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170 int SDL_SYS_StartTimer(void)
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171 {
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172 SDL_SetError("Internal logic error: Win32 uses threaded timer");
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173 return(-1);
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174 }
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175
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176 void SDL_SYS_StopTimer(void)
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177 {
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178 return;
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179 }
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180
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181 #endif /* USE_SETTIMER */
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