Mercurial > sdl-ios-xcode
annotate src/timer/win32/SDL_systimer.c @ 769:b8d311d90021
Updated copyright information for 2004 (Happy New Year!)
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 04 Jan 2004 16:49:27 +0000 |
parents | 621ab54c1dde |
children | bdcb8bb4c831 |
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0 | 1 /* |
2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2004 Sam Lantinga |
0 | 4 |
5 This library is free software; you can redistribute it and/or | |
6 modify it under the terms of the GNU Library General Public | |
7 License as published by the Free Software Foundation; either | |
8 version 2 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 Library General Public License for more details. | |
14 | |
15 You should have received a copy of the GNU Library General Public | |
16 License along with this library; if not, write to the Free | |
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | |
19 Sam Lantinga | |
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20 slouken@libsdl.org |
0 | 21 */ |
22 | |
23 #ifdef SAVE_RCSID | |
24 static char rcsid = | |
25 "@(#) $Id$"; | |
26 #endif | |
27 | |
28 #include <windows.h> | |
29 #include <mmsystem.h> | |
30 | |
31 #include "SDL_timer.h" | |
32 #include "SDL_timer_c.h" | |
33 #include "SDL_error.h" | |
34 | |
35 #ifdef _WIN32_WCE | |
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36 #define USE_GETTICKCOUNT |
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37 #define USE_SETTIMER |
0 | 38 #endif |
39 | |
40 #define TIME_WRAP_VALUE (~(DWORD)0) | |
41 | |
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42 /* The first (low-resolution) ticks value of the application */ |
0 | 43 static DWORD start; |
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 |
0 | 54 void SDL_StartTicks(void) |
55 { | |
56 /* Set first ticks value */ | |
57 #ifdef USE_GETTICKCOUNT | |
58 start = GetTickCount(); | |
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 } |
0 | 73 #endif |
74 } | |
75 | |
76 Uint32 SDL_GetTicks(void) | |
77 { | |
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 |
0 | 82 |
83 #ifdef USE_GETTICKCOUNT | |
84 now = GetTickCount(); | |
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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89 |
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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 } |
0 | 100 #endif |
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101 |
0 | 102 if ( now < start ) { |
103 ticks = (TIME_WRAP_VALUE-start) + now; | |
104 } else { | |
105 ticks = (now - start); | |
106 } | |
107 return(ticks); | |
108 } | |
109 | |
110 void SDL_Delay(Uint32 ms) | |
111 { | |
112 Sleep(ms); | |
113 } | |
114 | |
115 #ifdef USE_SETTIMER | |
116 | |
117 static UINT WIN_timer; | |
118 | |
119 int SDL_SYS_TimerInit(void) | |
120 { | |
121 return(0); | |
122 } | |
123 | |
124 void SDL_SYS_TimerQuit(void) | |
125 { | |
126 return; | |
127 } | |
128 | |
129 /* Forward declaration because this is called by the timer callback */ | |
130 int SDL_SYS_StartTimer(void); | |
131 | |
132 static VOID CALLBACK TimerCallbackProc(HWND hwnd, UINT uMsg, UINT idEvent, DWORD dwTime) | |
133 { | |
134 Uint32 ms; | |
135 | |
136 ms = SDL_alarm_callback(SDL_alarm_interval); | |
137 if ( ms != SDL_alarm_interval ) { | |
138 KillTimer(NULL, idEvent); | |
139 if ( ms ) { | |
140 SDL_alarm_interval = ROUND_RESOLUTION(ms); | |
141 SDL_SYS_StartTimer(); | |
142 } else { | |
143 SDL_alarm_interval = 0; | |
144 } | |
145 } | |
146 } | |
147 | |
148 int SDL_SYS_StartTimer(void) | |
149 { | |
150 int retval; | |
151 | |
152 WIN_timer = SetTimer(NULL, 0, SDL_alarm_interval, TimerCallbackProc); | |
153 if ( WIN_timer ) { | |
154 retval = 0; | |
155 } else { | |
156 retval = -1; | |
157 } | |
158 return retval; | |
159 } | |
160 | |
161 void SDL_SYS_StopTimer(void) | |
162 { | |
163 if ( WIN_timer ) { | |
164 KillTimer(NULL, WIN_timer); | |
165 WIN_timer = 0; | |
166 } | |
167 } | |
168 | |
169 #else /* !USE_SETTIMER */ | |
170 | |
171 /* Data to handle a single periodic alarm */ | |
172 static UINT timerID = 0; | |
173 | |
174 static void CALLBACK HandleAlarm(UINT uID, UINT uMsg, DWORD dwUser, | |
175 DWORD dw1, DWORD dw2) | |
176 { | |
177 SDL_ThreadedTimerCheck(); | |
178 } | |
179 | |
180 | |
181 int SDL_SYS_TimerInit(void) | |
182 { | |
183 MMRESULT result; | |
184 | |
185 /* Set timer resolution */ | |
186 result = timeBeginPeriod(TIMER_RESOLUTION); | |
187 if ( result != TIMERR_NOERROR ) { | |
188 SDL_SetError("Warning: Can't set %d ms timer resolution", | |
189 TIMER_RESOLUTION); | |
190 } | |
191 /* Allow 10 ms of drift so we don't chew on CPU */ | |
192 timerID = timeSetEvent(TIMER_RESOLUTION,1,HandleAlarm,0,TIME_PERIODIC); | |
193 if ( ! timerID ) { | |
194 SDL_SetError("timeSetEvent() failed"); | |
195 return(-1); | |
196 } | |
197 return(SDL_SetTimerThreaded(1)); | |
198 } | |
199 | |
200 void SDL_SYS_TimerQuit(void) | |
201 { | |
202 if ( timerID ) { | |
203 timeKillEvent(timerID); | |
204 } | |
205 timeEndPeriod(TIMER_RESOLUTION); | |
206 } | |
207 | |
208 int SDL_SYS_StartTimer(void) | |
209 { | |
210 SDL_SetError("Internal logic error: Win32 uses threaded timer"); | |
211 return(-1); | |
212 } | |
213 | |
214 void SDL_SYS_StopTimer(void) | |
215 { | |
216 return; | |
217 } | |
218 | |
219 #endif /* USE_SETTIMER */ |