Mercurial > sdl-ios-xcode
annotate src/timer/win32/SDL_systimer.c @ 1244:a388f2b59044
More dynamic X11 work.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Fri, 13 Jan 2006 01:08:39 +0000 |
| parents | bdcb8bb4c831 |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 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 #error This is WinCE. Please use src/timer/wince/SDL_systimer.c instead. |
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37 |
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38 /* but if you really want to use this file, use these #defines... */ |
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39 #define USE_GETTICKCOUNT |
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40 #define USE_SETTIMER |
| 0 | 41 #endif |
| 42 | |
| 43 #define TIME_WRAP_VALUE (~(DWORD)0) | |
| 44 | |
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45 /* The first (low-resolution) ticks value of the application */ |
| 0 | 46 static DWORD start; |
| 47 | |
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48 #ifndef USE_GETTICKCOUNT |
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49 /* Store if a high-resolution performance counter exists on the system */ |
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50 static BOOL hires_timer_available; |
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51 /* The first high-resolution ticks value of the application */ |
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52 static LARGE_INTEGER hires_start_ticks; |
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53 /* The number of ticks per second of the high-resolution performance counter */ |
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54 static LARGE_INTEGER hires_ticks_per_second; |
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55 #endif |
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56 |
| 0 | 57 void SDL_StartTicks(void) |
| 58 { | |
| 59 /* Set first ticks value */ | |
| 60 #ifdef USE_GETTICKCOUNT | |
| 61 start = GetTickCount(); | |
| 62 #else | |
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63 #if 0 /* Apparently there are problems with QPC on Win2K */ |
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64 if (QueryPerformanceFrequency(&hires_ticks_per_second) == TRUE) |
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65 { |
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66 hires_timer_available = TRUE; |
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67 QueryPerformanceCounter(&hires_start_ticks); |
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68 } |
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69 else |
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70 #endif |
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71 { |
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72 hires_timer_available = FALSE; |
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73 timeBeginPeriod(1); /* use 1 ms timer precision */ |
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74 start = timeGetTime(); |
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75 } |
| 0 | 76 #endif |
| 77 } | |
| 78 | |
| 79 Uint32 SDL_GetTicks(void) | |
| 80 { | |
| 81 DWORD now, ticks; | |
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82 #ifndef USE_GETTICKCOUNT |
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83 LARGE_INTEGER hires_now; |
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84 #endif |
| 0 | 85 |
| 86 #ifdef USE_GETTICKCOUNT | |
| 87 now = GetTickCount(); | |
| 88 #else | |
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89 if (hires_timer_available) |
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90 { |
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91 QueryPerformanceCounter(&hires_now); |
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92 |
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93 hires_now.QuadPart -= hires_start_ticks.QuadPart; |
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94 hires_now.QuadPart *= 1000; |
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95 hires_now.QuadPart /= hires_ticks_per_second.QuadPart; |
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96 |
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97 return (DWORD)hires_now.QuadPart; |
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98 } |
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99 else |
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100 { |
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101 now = timeGetTime(); |
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102 } |
| 0 | 103 #endif |
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104 |
| 0 | 105 if ( now < start ) { |
| 106 ticks = (TIME_WRAP_VALUE-start) + now; | |
| 107 } else { | |
| 108 ticks = (now - start); | |
| 109 } | |
| 110 return(ticks); | |
| 111 } | |
| 112 | |
| 113 void SDL_Delay(Uint32 ms) | |
| 114 { | |
| 115 Sleep(ms); | |
| 116 } | |
| 117 | |
| 118 #ifdef USE_SETTIMER | |
| 119 | |
| 120 static UINT WIN_timer; | |
| 121 | |
| 122 int SDL_SYS_TimerInit(void) | |
| 123 { | |
| 124 return(0); | |
| 125 } | |
| 126 | |
| 127 void SDL_SYS_TimerQuit(void) | |
| 128 { | |
| 129 return; | |
| 130 } | |
| 131 | |
| 132 /* Forward declaration because this is called by the timer callback */ | |
| 133 int SDL_SYS_StartTimer(void); | |
| 134 | |
| 135 static VOID CALLBACK TimerCallbackProc(HWND hwnd, UINT uMsg, UINT idEvent, DWORD dwTime) | |
| 136 { | |
| 137 Uint32 ms; | |
| 138 | |
| 139 ms = SDL_alarm_callback(SDL_alarm_interval); | |
| 140 if ( ms != SDL_alarm_interval ) { | |
| 141 KillTimer(NULL, idEvent); | |
| 142 if ( ms ) { | |
| 143 SDL_alarm_interval = ROUND_RESOLUTION(ms); | |
| 144 SDL_SYS_StartTimer(); | |
| 145 } else { | |
| 146 SDL_alarm_interval = 0; | |
| 147 } | |
| 148 } | |
| 149 } | |
| 150 | |
| 151 int SDL_SYS_StartTimer(void) | |
| 152 { | |
| 153 int retval; | |
| 154 | |
| 155 WIN_timer = SetTimer(NULL, 0, SDL_alarm_interval, TimerCallbackProc); | |
| 156 if ( WIN_timer ) { | |
| 157 retval = 0; | |
| 158 } else { | |
| 159 retval = -1; | |
| 160 } | |
| 161 return retval; | |
| 162 } | |
| 163 | |
| 164 void SDL_SYS_StopTimer(void) | |
| 165 { | |
| 166 if ( WIN_timer ) { | |
| 167 KillTimer(NULL, WIN_timer); | |
| 168 WIN_timer = 0; | |
| 169 } | |
| 170 } | |
| 171 | |
| 172 #else /* !USE_SETTIMER */ | |
| 173 | |
| 174 /* Data to handle a single periodic alarm */ | |
| 175 static UINT timerID = 0; | |
| 176 | |
| 177 static void CALLBACK HandleAlarm(UINT uID, UINT uMsg, DWORD dwUser, | |
| 178 DWORD dw1, DWORD dw2) | |
| 179 { | |
| 180 SDL_ThreadedTimerCheck(); | |
| 181 } | |
| 182 | |
| 183 | |
| 184 int SDL_SYS_TimerInit(void) | |
| 185 { | |
| 186 MMRESULT result; | |
| 187 | |
| 188 /* Set timer resolution */ | |
| 189 result = timeBeginPeriod(TIMER_RESOLUTION); | |
| 190 if ( result != TIMERR_NOERROR ) { | |
| 191 SDL_SetError("Warning: Can't set %d ms timer resolution", | |
| 192 TIMER_RESOLUTION); | |
| 193 } | |
| 194 /* Allow 10 ms of drift so we don't chew on CPU */ | |
| 195 timerID = timeSetEvent(TIMER_RESOLUTION,1,HandleAlarm,0,TIME_PERIODIC); | |
| 196 if ( ! timerID ) { | |
| 197 SDL_SetError("timeSetEvent() failed"); | |
| 198 return(-1); | |
| 199 } | |
| 200 return(SDL_SetTimerThreaded(1)); | |
| 201 } | |
| 202 | |
| 203 void SDL_SYS_TimerQuit(void) | |
| 204 { | |
| 205 if ( timerID ) { | |
| 206 timeKillEvent(timerID); | |
| 207 } | |
| 208 timeEndPeriod(TIMER_RESOLUTION); | |
| 209 } | |
| 210 | |
| 211 int SDL_SYS_StartTimer(void) | |
| 212 { | |
| 213 SDL_SetError("Internal logic error: Win32 uses threaded timer"); | |
| 214 return(-1); | |
| 215 } | |
| 216 | |
| 217 void SDL_SYS_StopTimer(void) | |
| 218 { | |
| 219 return; | |
| 220 } | |
| 221 | |
| 222 #endif /* USE_SETTIMER */ |