Mercurial > sdl-ios-xcode
annotate src/timer/win32/SDL_systimer.c @ 4057:0fbbaa1f9ed6 SDL-1.2
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| author | Patrice Mandin <patmandin@gmail.com> |
|---|---|
| date | Thu, 12 Jul 2007 19:00:08 +0000 |
| parents | 92947e3a18db |
| children | 782fd950bd46 c121d94672cb a1b03ba2fcd0 |
| 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 #ifdef SDL_TIMER_WIN32 |
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25 |
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26 #define WIN32_LEAN_AND_MEAN |
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27 #include <windows.h> |
| 0 | 28 #include <mmsystem.h> |
| 29 | |
| 30 #include "SDL_timer.h" | |
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31 #include "../SDL_timer_c.h" |
| 0 | 32 |
| 33 #ifdef _WIN32_WCE | |
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34 #error This is WinCE. Please use src/timer/wince/SDL_systimer.c instead. |
| 0 | 35 #endif |
| 36 | |
| 37 #define TIME_WRAP_VALUE (~(DWORD)0) | |
| 38 | |
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39 /* The first (low-resolution) ticks value of the application */ |
| 0 | 40 static DWORD start; |
| 41 | |
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42 #ifndef USE_GETTICKCOUNT |
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43 /* Store if a high-resolution performance counter exists on the system */ |
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44 static BOOL hires_timer_available; |
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45 /* The first high-resolution ticks value of the application */ |
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46 static LARGE_INTEGER hires_start_ticks; |
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47 /* The number of ticks per second of the high-resolution performance counter */ |
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48 static LARGE_INTEGER hires_ticks_per_second; |
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49 #endif |
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50 |
| 0 | 51 void SDL_StartTicks(void) |
| 52 { | |
| 53 /* Set first ticks value */ | |
| 54 #ifdef USE_GETTICKCOUNT | |
| 55 start = GetTickCount(); | |
| 56 #else | |
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57 #if 0 /* Apparently there are problems with QPC on Win2K */ |
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58 if (QueryPerformanceFrequency(&hires_ticks_per_second) == TRUE) |
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59 { |
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60 hires_timer_available = TRUE; |
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61 QueryPerformanceCounter(&hires_start_ticks); |
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62 } |
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63 else |
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64 #endif |
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65 { |
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66 hires_timer_available = FALSE; |
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67 timeBeginPeriod(1); /* use 1 ms timer precision */ |
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68 start = timeGetTime(); |
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69 } |
| 0 | 70 #endif |
| 71 } | |
| 72 | |
| 73 Uint32 SDL_GetTicks(void) | |
| 74 { | |
| 75 DWORD now, ticks; | |
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76 #ifndef USE_GETTICKCOUNT |
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77 LARGE_INTEGER hires_now; |
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78 #endif |
| 0 | 79 |
| 80 #ifdef USE_GETTICKCOUNT | |
| 81 now = GetTickCount(); | |
| 82 #else | |
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83 if (hires_timer_available) |
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84 { |
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85 QueryPerformanceCounter(&hires_now); |
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86 |
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87 hires_now.QuadPart -= hires_start_ticks.QuadPart; |
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88 hires_now.QuadPart *= 1000; |
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89 hires_now.QuadPart /= hires_ticks_per_second.QuadPart; |
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90 |
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91 return (DWORD)hires_now.QuadPart; |
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92 } |
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93 else |
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94 { |
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95 now = timeGetTime(); |
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96 } |
| 0 | 97 #endif |
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98 |
| 0 | 99 if ( now < start ) { |
| 100 ticks = (TIME_WRAP_VALUE-start) + now; | |
| 101 } else { | |
| 102 ticks = (now - start); | |
| 103 } | |
| 104 return(ticks); | |
| 105 } | |
| 106 | |
| 107 void SDL_Delay(Uint32 ms) | |
| 108 { | |
| 109 Sleep(ms); | |
| 110 } | |
| 111 | |
| 112 /* Data to handle a single periodic alarm */ | |
| 113 static UINT timerID = 0; | |
| 114 | |
| 1480 | 115 static void CALLBACK HandleAlarm(UINT uID, UINT uMsg, DWORD_PTR dwUser, |
| 116 DWORD_PTR dw1, DWORD_PTR dw2) | |
| 0 | 117 { |
| 118 SDL_ThreadedTimerCheck(); | |
| 119 } | |
| 120 | |
| 121 | |
| 122 int SDL_SYS_TimerInit(void) | |
| 123 { | |
| 124 MMRESULT result; | |
| 125 | |
| 126 /* Set timer resolution */ | |
| 127 result = timeBeginPeriod(TIMER_RESOLUTION); | |
| 128 if ( result != TIMERR_NOERROR ) { | |
| 129 SDL_SetError("Warning: Can't set %d ms timer resolution", | |
| 130 TIMER_RESOLUTION); | |
| 131 } | |
| 132 /* Allow 10 ms of drift so we don't chew on CPU */ | |
| 133 timerID = timeSetEvent(TIMER_RESOLUTION,1,HandleAlarm,0,TIME_PERIODIC); | |
| 134 if ( ! timerID ) { | |
| 135 SDL_SetError("timeSetEvent() failed"); | |
| 136 return(-1); | |
| 137 } | |
| 138 return(SDL_SetTimerThreaded(1)); | |
| 139 } | |
| 140 | |
| 141 void SDL_SYS_TimerQuit(void) | |
| 142 { | |
| 143 if ( timerID ) { | |
| 144 timeKillEvent(timerID); | |
| 145 } | |
| 146 timeEndPeriod(TIMER_RESOLUTION); | |
| 147 } | |
| 148 | |
| 149 int SDL_SYS_StartTimer(void) | |
| 150 { | |
| 151 SDL_SetError("Internal logic error: Win32 uses threaded timer"); | |
| 152 return(-1); | |
| 153 } | |
| 154 | |
| 155 void SDL_SYS_StopTimer(void) | |
| 156 { | |
| 157 return; | |
| 158 } | |
| 159 | |
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160 #endif /* SDL_TIMER_WIN32 */ |