Mercurial > sdl-ios-xcode
annotate src/timer/win32/SDL_systimer.c @ 1446:47bf1767c4ca
Date: Mon, 27 Feb 2006 02:17:29 +0100
From: "William Petiot [exoide]"
Subject: Re: [SDL] cvs version: questions regarding HAVE_STDIO_H in standard w
I managed to get a first implementation of it, which I tested for "simple" use
with tests sample apps, they work ok. I think this needs more tests.
Here is the diff against CVS/SDL12, attached.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 27 Feb 2006 03:48:48 +0000 |
| parents | bb6839704ed6 |
| children | 0a2bd6507477 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 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 Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
|
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 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 | |
|
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13 Lesser General Public License for more details. |
| 0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
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24 #define WIN32_LEAN_AND_MEAN |
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25 #include <windows.h> |
| 0 | 26 #include <mmsystem.h> |
| 27 | |
| 28 #include "SDL_timer.h" | |
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29 #include "../SDL_timer_c.h" |
| 0 | 30 |
| 31 #ifdef _WIN32_WCE | |
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32 #error This is WinCE. Please use src/timer/wince/SDL_systimer.c instead. |
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33 |
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34 /* but if you really want to use this file, use these #defines... */ |
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35 #define USE_GETTICKCOUNT |
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36 #define USE_SETTIMER |
| 0 | 37 #endif |
| 38 | |
| 39 #define TIME_WRAP_VALUE (~(DWORD)0) | |
| 40 | |
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41 /* The first (low-resolution) ticks value of the application */ |
| 0 | 42 static DWORD start; |
| 43 | |
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44 #ifndef USE_GETTICKCOUNT |
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45 /* Store if a high-resolution performance counter exists on the system */ |
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46 static BOOL hires_timer_available; |
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47 /* The first high-resolution ticks value of the application */ |
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48 static LARGE_INTEGER hires_start_ticks; |
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49 /* The number of ticks per second of the high-resolution performance counter */ |
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50 static LARGE_INTEGER hires_ticks_per_second; |
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51 #endif |
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52 |
| 0 | 53 void SDL_StartTicks(void) |
| 54 { | |
| 55 /* Set first ticks value */ | |
| 56 #ifdef USE_GETTICKCOUNT | |
| 57 start = GetTickCount(); | |
| 58 #else | |
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59 #if 0 /* Apparently there are problems with QPC on Win2K */ |
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60 if (QueryPerformanceFrequency(&hires_ticks_per_second) == TRUE) |
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61 { |
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62 hires_timer_available = TRUE; |
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63 QueryPerformanceCounter(&hires_start_ticks); |
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64 } |
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65 else |
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66 #endif |
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67 { |
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68 hires_timer_available = FALSE; |
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69 timeBeginPeriod(1); /* use 1 ms timer precision */ |
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70 start = timeGetTime(); |
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71 } |
| 0 | 72 #endif |
| 73 } | |
| 74 | |
| 75 Uint32 SDL_GetTicks(void) | |
| 76 { | |
| 77 DWORD now, ticks; | |
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78 #ifndef USE_GETTICKCOUNT |
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79 LARGE_INTEGER hires_now; |
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80 #endif |
| 0 | 81 |
| 82 #ifdef USE_GETTICKCOUNT | |
| 83 now = GetTickCount(); | |
| 84 #else | |
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85 if (hires_timer_available) |
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86 { |
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87 QueryPerformanceCounter(&hires_now); |
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88 |
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89 hires_now.QuadPart -= hires_start_ticks.QuadPart; |
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90 hires_now.QuadPart *= 1000; |
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91 hires_now.QuadPart /= hires_ticks_per_second.QuadPart; |
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92 |
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93 return (DWORD)hires_now.QuadPart; |
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94 } |
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95 else |
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96 { |
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97 now = timeGetTime(); |
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98 } |
| 0 | 99 #endif |
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100 |
| 0 | 101 if ( now < start ) { |
| 102 ticks = (TIME_WRAP_VALUE-start) + now; | |
| 103 } else { | |
| 104 ticks = (now - start); | |
| 105 } | |
| 106 return(ticks); | |
| 107 } | |
| 108 | |
| 109 void SDL_Delay(Uint32 ms) | |
| 110 { | |
| 111 Sleep(ms); | |
| 112 } | |
| 113 | |
| 114 #ifdef USE_SETTIMER | |
| 115 | |
| 116 static UINT WIN_timer; | |
| 117 | |
| 118 int SDL_SYS_TimerInit(void) | |
| 119 { | |
| 120 return(0); | |
| 121 } | |
| 122 | |
| 123 void SDL_SYS_TimerQuit(void) | |
| 124 { | |
| 125 return; | |
| 126 } | |
| 127 | |
| 128 /* Forward declaration because this is called by the timer callback */ | |
| 129 int SDL_SYS_StartTimer(void); | |
| 130 | |
| 131 static VOID CALLBACK TimerCallbackProc(HWND hwnd, UINT uMsg, UINT idEvent, DWORD dwTime) | |
| 132 { | |
| 133 Uint32 ms; | |
| 134 | |
| 135 ms = SDL_alarm_callback(SDL_alarm_interval); | |
| 136 if ( ms != SDL_alarm_interval ) { | |
| 137 KillTimer(NULL, idEvent); | |
| 138 if ( ms ) { | |
| 139 SDL_alarm_interval = ROUND_RESOLUTION(ms); | |
| 140 SDL_SYS_StartTimer(); | |
| 141 } else { | |
| 142 SDL_alarm_interval = 0; | |
| 143 } | |
| 144 } | |
| 145 } | |
| 146 | |
| 147 int SDL_SYS_StartTimer(void) | |
| 148 { | |
| 149 int retval; | |
| 150 | |
| 151 WIN_timer = SetTimer(NULL, 0, SDL_alarm_interval, TimerCallbackProc); | |
| 152 if ( WIN_timer ) { | |
| 153 retval = 0; | |
| 154 } else { | |
| 155 retval = -1; | |
| 156 } | |
| 157 return retval; | |
| 158 } | |
| 159 | |
| 160 void SDL_SYS_StopTimer(void) | |
| 161 { | |
| 162 if ( WIN_timer ) { | |
| 163 KillTimer(NULL, WIN_timer); | |
| 164 WIN_timer = 0; | |
| 165 } | |
| 166 } | |
| 167 | |
| 168 #else /* !USE_SETTIMER */ | |
| 169 | |
| 170 /* Data to handle a single periodic alarm */ | |
| 171 static UINT timerID = 0; | |
| 172 | |
| 173 static void CALLBACK HandleAlarm(UINT uID, UINT uMsg, DWORD dwUser, | |
| 174 DWORD dw1, DWORD dw2) | |
| 175 { | |
| 176 SDL_ThreadedTimerCheck(); | |
| 177 } | |
| 178 | |
| 179 | |
| 180 int SDL_SYS_TimerInit(void) | |
| 181 { | |
| 182 MMRESULT result; | |
| 183 | |
| 184 /* Set timer resolution */ | |
| 185 result = timeBeginPeriod(TIMER_RESOLUTION); | |
| 186 if ( result != TIMERR_NOERROR ) { | |
| 187 SDL_SetError("Warning: Can't set %d ms timer resolution", | |
| 188 TIMER_RESOLUTION); | |
| 189 } | |
| 190 /* Allow 10 ms of drift so we don't chew on CPU */ | |
| 191 timerID = timeSetEvent(TIMER_RESOLUTION,1,HandleAlarm,0,TIME_PERIODIC); | |
| 192 if ( ! timerID ) { | |
| 193 SDL_SetError("timeSetEvent() failed"); | |
| 194 return(-1); | |
| 195 } | |
| 196 return(SDL_SetTimerThreaded(1)); | |
| 197 } | |
| 198 | |
| 199 void SDL_SYS_TimerQuit(void) | |
| 200 { | |
| 201 if ( timerID ) { | |
| 202 timeKillEvent(timerID); | |
| 203 } | |
| 204 timeEndPeriod(TIMER_RESOLUTION); | |
| 205 } | |
| 206 | |
| 207 int SDL_SYS_StartTimer(void) | |
| 208 { | |
| 209 SDL_SetError("Internal logic error: Win32 uses threaded timer"); | |
| 210 return(-1); | |
| 211 } | |
| 212 | |
| 213 void SDL_SYS_StopTimer(void) | |
| 214 { | |
| 215 return; | |
| 216 } | |
| 217 | |
| 218 #endif /* USE_SETTIMER */ |