Mercurial > sdl-ios-xcode
annotate src/timer/win32/SDL_systimer.c @ 1622:5bbfc3e20e10
Fixed bug #191
[I opted to go for a warning, since I often tweak configure.in, but don't want to rebuild the entire project]
One thing that was lost in the switch from automake to the new build system is
that there is now no rule to build configure from configure.in.
IMHO, if configure.in gets changed, then at the very least, the build system
should print out a warning (better, again IMHO, an error) about this fact.
Else, you easily forget about this when modifying configure.in.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 13 Apr 2006 13:23:56 +0000 |
| parents | 420b3f47806d |
| children | 92947e3a18db |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information and removed rcs id lines (problematic in branch merges)
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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 | |
|
252
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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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SDL_windows.h is no longer necessary
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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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New configure-based build system. Still work in progress, but much improved
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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>
Ryan C. Gordon <icculus@icculus.org>
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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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326
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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 |