Mercurial > sdl-ios-xcode
annotate src/timer/win32/SDL_systimer.c @ 1593:5115439d67b1
Consolidate all the X11 libraries, so you don't have to update 12 different
places in the source when adding a new one. Also handles build systems that
don't define a given library.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Thu, 23 Mar 2006 02:47:56 +0000 |
| parents | 420b3f47806d |
| children | 92947e3a18db |
| 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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From: Tyler Montbriand <tsm@accesscomm.ca>
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32 #error This is WinCE. Please use src/timer/wince/SDL_systimer.c instead. |
| 0 | 33 #endif |
| 34 | |
| 35 #define TIME_WRAP_VALUE (~(DWORD)0) | |
| 36 | |
|
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37 /* The first (low-resolution) ticks value of the application */ |
| 0 | 38 static DWORD start; |
| 39 | |
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40 #ifndef USE_GETTICKCOUNT |
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41 /* Store if a high-resolution performance counter exists on the system */ |
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42 static BOOL hires_timer_available; |
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43 /* The first high-resolution ticks value of the application */ |
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44 static LARGE_INTEGER hires_start_ticks; |
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45 /* The number of ticks per second of the high-resolution performance counter */ |
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46 static LARGE_INTEGER hires_ticks_per_second; |
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47 #endif |
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48 |
| 0 | 49 void SDL_StartTicks(void) |
| 50 { | |
| 51 /* Set first ticks value */ | |
| 52 #ifdef USE_GETTICKCOUNT | |
| 53 start = GetTickCount(); | |
| 54 #else | |
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55 #if 0 /* Apparently there are problems with QPC on Win2K */ |
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56 if (QueryPerformanceFrequency(&hires_ticks_per_second) == TRUE) |
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57 { |
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58 hires_timer_available = TRUE; |
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59 QueryPerformanceCounter(&hires_start_ticks); |
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60 } |
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61 else |
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62 #endif |
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63 { |
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64 hires_timer_available = FALSE; |
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65 timeBeginPeriod(1); /* use 1 ms timer precision */ |
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66 start = timeGetTime(); |
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67 } |
| 0 | 68 #endif |
| 69 } | |
| 70 | |
| 71 Uint32 SDL_GetTicks(void) | |
| 72 { | |
| 73 DWORD now, ticks; | |
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74 #ifndef USE_GETTICKCOUNT |
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75 LARGE_INTEGER hires_now; |
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76 #endif |
| 0 | 77 |
| 78 #ifdef USE_GETTICKCOUNT | |
| 79 now = GetTickCount(); | |
| 80 #else | |
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81 if (hires_timer_available) |
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82 { |
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83 QueryPerformanceCounter(&hires_now); |
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84 |
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85 hires_now.QuadPart -= hires_start_ticks.QuadPart; |
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86 hires_now.QuadPart *= 1000; |
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87 hires_now.QuadPart /= hires_ticks_per_second.QuadPart; |
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88 |
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89 return (DWORD)hires_now.QuadPart; |
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90 } |
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91 else |
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92 { |
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93 now = timeGetTime(); |
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94 } |
| 0 | 95 #endif |
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96 |
| 0 | 97 if ( now < start ) { |
| 98 ticks = (TIME_WRAP_VALUE-start) + now; | |
| 99 } else { | |
| 100 ticks = (now - start); | |
| 101 } | |
| 102 return(ticks); | |
| 103 } | |
| 104 | |
| 105 void SDL_Delay(Uint32 ms) | |
| 106 { | |
| 107 Sleep(ms); | |
| 108 } | |
| 109 | |
| 110 /* Data to handle a single periodic alarm */ | |
| 111 static UINT timerID = 0; | |
| 112 | |
| 1480 | 113 static void CALLBACK HandleAlarm(UINT uID, UINT uMsg, DWORD_PTR dwUser, |
| 114 DWORD_PTR dw1, DWORD_PTR dw2) | |
| 0 | 115 { |
| 116 SDL_ThreadedTimerCheck(); | |
| 117 } | |
| 118 | |
| 119 | |
| 120 int SDL_SYS_TimerInit(void) | |
| 121 { | |
| 122 MMRESULT result; | |
| 123 | |
| 124 /* Set timer resolution */ | |
| 125 result = timeBeginPeriod(TIMER_RESOLUTION); | |
| 126 if ( result != TIMERR_NOERROR ) { | |
| 127 SDL_SetError("Warning: Can't set %d ms timer resolution", | |
| 128 TIMER_RESOLUTION); | |
| 129 } | |
| 130 /* Allow 10 ms of drift so we don't chew on CPU */ | |
| 131 timerID = timeSetEvent(TIMER_RESOLUTION,1,HandleAlarm,0,TIME_PERIODIC); | |
| 132 if ( ! timerID ) { | |
| 133 SDL_SetError("timeSetEvent() failed"); | |
| 134 return(-1); | |
| 135 } | |
| 136 return(SDL_SetTimerThreaded(1)); | |
| 137 } | |
| 138 | |
| 139 void SDL_SYS_TimerQuit(void) | |
| 140 { | |
| 141 if ( timerID ) { | |
| 142 timeKillEvent(timerID); | |
| 143 } | |
| 144 timeEndPeriod(TIMER_RESOLUTION); | |
| 145 } | |
| 146 | |
| 147 int SDL_SYS_StartTimer(void) | |
| 148 { | |
| 149 SDL_SetError("Internal logic error: Win32 uses threaded timer"); | |
| 150 return(-1); | |
| 151 } | |
| 152 | |
| 153 void SDL_SYS_StopTimer(void) | |
| 154 { | |
| 155 return; | |
| 156 } | |
| 157 |