1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2012 Sam Lantinga
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 This library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with this library; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18
19 Sam Lantinga
20 slouken@libsdl.org
21 */
22 #include "SDL_config.h"
23
24 #ifdef SDL_TIMER_WINCE
25
26 #define WIN32_LEAN_AND_MEAN
27 #include <windows.h>
28 #include <mmsystem.h>
29
30 #include "SDL_thread.h"
31 #include "SDL_timer.h"
32 #include "../SDL_timer_c.h"
33
34 static Uint64 start_date;
35 static Uint64 start_ticks;
36
wce_ticks(void)37 static Uint64 wce_ticks(void)
38 {
39 return((Uint64)GetTickCount());
40 }
41
wce_date(void)42 static Uint64 wce_date(void)
43 {
44 union
45 {
46 FILETIME ftime;
47 Uint64 itime;
48 } ftime;
49 SYSTEMTIME stime;
50
51 GetSystemTime(&stime);
52 SystemTimeToFileTime(&stime,&ftime.ftime);
53 ftime.itime/=10000; // Convert 100ns intervals to 1ms intervals
54 // Remove ms portion, which can't be relied on
55 ftime.itime -= (ftime.itime % 1000);
56 return(ftime.itime);
57 }
58
wce_rel_ticks(void)59 static Sint32 wce_rel_ticks(void)
60 {
61 return((Sint32)(wce_ticks()-start_ticks));
62 }
63
wce_rel_date(void)64 static Sint32 wce_rel_date(void)
65 {
66 return((Sint32)(wce_date()-start_date));
67 }
68
69 /* Return time in ms relative to when SDL was started */
SDL_GetTicks()70 Uint32 SDL_GetTicks()
71 {
72 Sint32 offset=wce_rel_date()-wce_rel_ticks();
73 if((offset < -1000) || (offset > 1000))
74 {
75 // fprintf(stderr,"Time desync(%+d), resyncing\n",offset/1000);
76 start_ticks-=offset;
77 }
78
79 return((Uint32)wce_rel_ticks());
80 }
81
82 /* Give up approx. givem milliseconds to the OS. */
SDL_Delay(Uint32 ms)83 void SDL_Delay(Uint32 ms)
84 {
85 Sleep(ms);
86 }
87
88 /* Recard start-time of application for reference */
SDL_StartTicks(void)89 void SDL_StartTicks(void)
90 {
91 start_date=wce_date();
92 start_ticks=wce_ticks();
93 }
94
95 static UINT WIN_timer;
96
97 #if ( _WIN32_WCE <= 420 )
98
99 static HANDLE timersThread = 0;
100 static HANDLE timersQuitEvent = 0;
101
TimersThreadProc(void * data)102 DWORD TimersThreadProc(void *data)
103 {
104 while(WaitForSingleObject(timersQuitEvent, 10) == WAIT_TIMEOUT)
105 {
106 SDL_ThreadedTimerCheck();
107 }
108 return 0;
109 }
110
SDL_SYS_TimerInit(void)111 int SDL_SYS_TimerInit(void)
112 {
113 // create a thread to process a threaded timers
114 // SetTimer does not suit the needs because
115 // TimerCallbackProc will be called only when WM_TIMER occured
116
117 timersQuitEvent = CreateEvent(0, TRUE, FALSE, 0);
118 if( !timersQuitEvent )
119 {
120 SDL_SetError("Cannot create event for timers thread");
121 return -1;
122 }
123 timersThread = CreateThread(NULL, 0, TimersThreadProc, 0, 0, 0);
124 if( !timersThread )
125 {
126 SDL_SetError("Cannot create timers thread, check amount of RAM available");
127 return -1;
128 }
129 SetThreadPriority(timersThread, THREAD_PRIORITY_HIGHEST);
130
131 return(SDL_SetTimerThreaded(1));
132 }
133
SDL_SYS_TimerQuit(void)134 void SDL_SYS_TimerQuit(void)
135 {
136 SetEvent(timersQuitEvent);
137 if( WaitForSingleObject(timersThread, 2000) == WAIT_TIMEOUT )
138 TerminateThread(timersThread, 0);
139 CloseHandle(timersThread);
140 CloseHandle(timersQuitEvent);
141 return;
142 }
143
144 #else
145
146 #pragma comment(lib, "mmtimer.lib")
147
148 /* Data to handle a single periodic alarm */
149 static UINT timerID = 0;
150
HandleAlarm(UINT uID,UINT uMsg,DWORD dwUser,DWORD dw1,DWORD dw2)151 static void CALLBACK HandleAlarm(UINT uID, UINT uMsg, DWORD dwUser,
152 DWORD dw1, DWORD dw2)
153 {
154 SDL_ThreadedTimerCheck();
155 }
156
157
SDL_SYS_TimerInit(void)158 int SDL_SYS_TimerInit(void)
159 {
160 MMRESULT result;
161
162 /* Set timer resolution */
163 result = timeBeginPeriod(TIMER_RESOLUTION);
164 if ( result != TIMERR_NOERROR ) {
165 SDL_SetError("Warning: Can't set %d ms timer resolution",
166 TIMER_RESOLUTION);
167 }
168 /* Allow 10 ms of drift so we don't chew on CPU */
169 timerID = timeSetEvent(TIMER_RESOLUTION,1,HandleAlarm,0,TIME_PERIODIC);
170 if ( ! timerID ) {
171 SDL_SetError("timeSetEvent() failed");
172 return(-1);
173 }
174 return(SDL_SetTimerThreaded(1));
175 }
176
SDL_SYS_TimerQuit(void)177 void SDL_SYS_TimerQuit(void)
178 {
179 if ( timerID ) {
180 timeKillEvent(timerID);
181 }
182 timeEndPeriod(TIMER_RESOLUTION);
183 }
184
185 #endif
186
SDL_SYS_StartTimer(void)187 int SDL_SYS_StartTimer(void)
188 {
189 SDL_SetError("Internal logic error: WinCE uses threaded timer");
190 return(-1);
191 }
192
SDL_SYS_StopTimer(void)193 void SDL_SYS_StopTimer(void)
194 {
195 return;
196 }
197
198 #endif /* SDL_TIMER_WINCE */
199