Mercurial > sdl-ios-xcode
annotate src/timer/win32/SDL_systimer.c @ 610:95433459fbd2
Date: Mon, 14 Apr 2003 22:08:27 +0100
From: Patrice Mandin
Subject: [SDL][PATCH] 2 patches for sdl
Here are 2 patches for SDL:
- One is to put the dummy video drivers at the end of the
video drivers list. It gave me problems, when
SDL_VIDEODRIVER is not set, and the dummy driver is used
instead of the platform's driver, just because it is
always available. So the dummy driver must always be at
the end of the list. I suppose picogui and dc video
drivers also don't work.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 15 Apr 2003 15:46:56 +0000 |
| parents | 621ab54c1dde |
| children | b8d311d90021 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
297
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Updated copyright information for 2002
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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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Updated the source with the correct e-mail address
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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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Fixed building timer code on Windows CE
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36 #define USE_GETTICKCOUNT |
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37 #define USE_SETTIMER |
| 0 | 38 #endif |
| 39 | |
| 40 #define TIME_WRAP_VALUE (~(DWORD)0) | |
| 41 | |
|
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Added Holger Schemel's fix for SDL_GetTicks() on W2K
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42 /* The first (low-resolution) ticks value of the application */ |
| 0 | 43 static DWORD start; |
| 44 | |
|
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45 #ifndef USE_GETTICKCOUNT |
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46 /* Store if a high-resolution performance counter exists on the system */ |
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47 static BOOL hires_timer_available; |
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48 /* The first high-resolution ticks value of the application */ |
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49 static LARGE_INTEGER hires_start_ticks; |
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50 /* The number of ticks per second of the high-resolution performance counter */ |
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51 static LARGE_INTEGER hires_ticks_per_second; |
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52 #endif |
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53 |
| 0 | 54 void SDL_StartTicks(void) |
| 55 { | |
| 56 /* Set first ticks value */ | |
| 57 #ifdef USE_GETTICKCOUNT | |
| 58 start = GetTickCount(); | |
| 59 #else | |
|
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Disabled QueryPerformanceCounter(), due to problems on Win2K
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60 #if 0 /* Apparently there are problems with QPC on Win2K */ |
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61 if (QueryPerformanceFrequency(&hires_ticks_per_second) == TRUE) |
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62 { |
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63 hires_timer_available = TRUE; |
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64 QueryPerformanceCounter(&hires_start_ticks); |
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65 } |
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66 else |
|
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67 #endif |
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68 { |
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69 hires_timer_available = FALSE; |
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70 timeBeginPeriod(1); /* use 1 ms timer precision */ |
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71 start = timeGetTime(); |
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72 } |
| 0 | 73 #endif |
| 74 } | |
| 75 | |
| 76 Uint32 SDL_GetTicks(void) | |
| 77 { | |
| 78 DWORD now, ticks; | |
|
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79 #ifndef USE_GETTICKCOUNT |
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80 LARGE_INTEGER hires_now; |
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81 #endif |
| 0 | 82 |
| 83 #ifdef USE_GETTICKCOUNT | |
| 84 now = GetTickCount(); | |
| 85 #else | |
|
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86 if (hires_timer_available) |
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87 { |
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88 QueryPerformanceCounter(&hires_now); |
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89 |
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69b8fac3e1c0
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90 hires_now.QuadPart -= hires_start_ticks.QuadPart; |
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91 hires_now.QuadPart *= 1000; |
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92 hires_now.QuadPart /= hires_ticks_per_second.QuadPart; |
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93 |
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94 return (DWORD)hires_now.QuadPart; |
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95 } |
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96 else |
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97 { |
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98 now = timeGetTime(); |
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99 } |
| 0 | 100 #endif |
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101 |
| 0 | 102 if ( now < start ) { |
| 103 ticks = (TIME_WRAP_VALUE-start) + now; | |
| 104 } else { | |
| 105 ticks = (now - start); | |
| 106 } | |
| 107 return(ticks); | |
| 108 } | |
| 109 | |
| 110 void SDL_Delay(Uint32 ms) | |
| 111 { | |
| 112 Sleep(ms); | |
| 113 } | |
| 114 | |
| 115 #ifdef USE_SETTIMER | |
| 116 | |
| 117 static UINT WIN_timer; | |
| 118 | |
| 119 int SDL_SYS_TimerInit(void) | |
| 120 { | |
| 121 return(0); | |
| 122 } | |
| 123 | |
| 124 void SDL_SYS_TimerQuit(void) | |
| 125 { | |
| 126 return; | |
| 127 } | |
| 128 | |
| 129 /* Forward declaration because this is called by the timer callback */ | |
| 130 int SDL_SYS_StartTimer(void); | |
| 131 | |
| 132 static VOID CALLBACK TimerCallbackProc(HWND hwnd, UINT uMsg, UINT idEvent, DWORD dwTime) | |
| 133 { | |
| 134 Uint32 ms; | |
| 135 | |
| 136 ms = SDL_alarm_callback(SDL_alarm_interval); | |
| 137 if ( ms != SDL_alarm_interval ) { | |
| 138 KillTimer(NULL, idEvent); | |
| 139 if ( ms ) { | |
| 140 SDL_alarm_interval = ROUND_RESOLUTION(ms); | |
| 141 SDL_SYS_StartTimer(); | |
| 142 } else { | |
| 143 SDL_alarm_interval = 0; | |
| 144 } | |
| 145 } | |
| 146 } | |
| 147 | |
| 148 int SDL_SYS_StartTimer(void) | |
| 149 { | |
| 150 int retval; | |
| 151 | |
| 152 WIN_timer = SetTimer(NULL, 0, SDL_alarm_interval, TimerCallbackProc); | |
| 153 if ( WIN_timer ) { | |
| 154 retval = 0; | |
| 155 } else { | |
| 156 retval = -1; | |
| 157 } | |
| 158 return retval; | |
| 159 } | |
| 160 | |
| 161 void SDL_SYS_StopTimer(void) | |
| 162 { | |
| 163 if ( WIN_timer ) { | |
| 164 KillTimer(NULL, WIN_timer); | |
| 165 WIN_timer = 0; | |
| 166 } | |
| 167 } | |
| 168 | |
| 169 #else /* !USE_SETTIMER */ | |
| 170 | |
| 171 /* Data to handle a single periodic alarm */ | |
| 172 static UINT timerID = 0; | |
| 173 | |
| 174 static void CALLBACK HandleAlarm(UINT uID, UINT uMsg, DWORD dwUser, | |
| 175 DWORD dw1, DWORD dw2) | |
| 176 { | |
| 177 SDL_ThreadedTimerCheck(); | |
| 178 } | |
| 179 | |
| 180 | |
| 181 int SDL_SYS_TimerInit(void) | |
| 182 { | |
| 183 MMRESULT result; | |
| 184 | |
| 185 /* Set timer resolution */ | |
| 186 result = timeBeginPeriod(TIMER_RESOLUTION); | |
| 187 if ( result != TIMERR_NOERROR ) { | |
| 188 SDL_SetError("Warning: Can't set %d ms timer resolution", | |
| 189 TIMER_RESOLUTION); | |
| 190 } | |
| 191 /* Allow 10 ms of drift so we don't chew on CPU */ | |
| 192 timerID = timeSetEvent(TIMER_RESOLUTION,1,HandleAlarm,0,TIME_PERIODIC); | |
| 193 if ( ! timerID ) { | |
| 194 SDL_SetError("timeSetEvent() failed"); | |
| 195 return(-1); | |
| 196 } | |
| 197 return(SDL_SetTimerThreaded(1)); | |
| 198 } | |
| 199 | |
| 200 void SDL_SYS_TimerQuit(void) | |
| 201 { | |
| 202 if ( timerID ) { | |
| 203 timeKillEvent(timerID); | |
| 204 } | |
| 205 timeEndPeriod(TIMER_RESOLUTION); | |
| 206 } | |
| 207 | |
| 208 int SDL_SYS_StartTimer(void) | |
| 209 { | |
| 210 SDL_SetError("Internal logic error: Win32 uses threaded timer"); | |
| 211 return(-1); | |
| 212 } | |
| 213 | |
| 214 void SDL_SYS_StopTimer(void) | |
| 215 { | |
| 216 return; | |
| 217 } | |
| 218 | |
| 219 #endif /* USE_SETTIMER */ |