diff options
Diffstat (limited to 'distrib/sdl-1.2.15/src/timer/win32/SDL_systimer.c')
| -rw-r--r-- | distrib/sdl-1.2.15/src/timer/win32/SDL_systimer.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.15/src/timer/win32/SDL_systimer.c b/distrib/sdl-1.2.15/src/timer/win32/SDL_systimer.c new file mode 100644 index 0000000..b025e2e --- /dev/null +++ b/distrib/sdl-1.2.15/src/timer/win32/SDL_systimer.c @@ -0,0 +1,160 @@ +/* + SDL - Simple DirectMedia Layer + Copyright (C) 1997-2012 Sam Lantinga + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + + Sam Lantinga + slouken@libsdl.org +*/ +#include "SDL_config.h" + +#ifdef SDL_TIMER_WIN32 + +#define WIN32_LEAN_AND_MEAN +#include <windows.h> +#include <mmsystem.h> + +#include "SDL_timer.h" +#include "../SDL_timer_c.h" + +#ifdef _WIN32_WCE + #error This is WinCE. Please use src/timer/wince/SDL_systimer.c instead. +#endif + +#define TIME_WRAP_VALUE (~(DWORD)0) + +/* The first (low-resolution) ticks value of the application */ +static DWORD start; + +#ifndef USE_GETTICKCOUNT +/* Store if a high-resolution performance counter exists on the system */ +static BOOL hires_timer_available; +/* The first high-resolution ticks value of the application */ +static LARGE_INTEGER hires_start_ticks; +/* The number of ticks per second of the high-resolution performance counter */ +static LARGE_INTEGER hires_ticks_per_second; +#endif + +void SDL_StartTicks(void) +{ + /* Set first ticks value */ +#ifdef USE_GETTICKCOUNT + start = GetTickCount(); +#else +#if 0 /* Apparently there are problems with QPC on Win2K */ + if (QueryPerformanceFrequency(&hires_ticks_per_second) == TRUE) + { + hires_timer_available = TRUE; + QueryPerformanceCounter(&hires_start_ticks); + } + else +#endif + { + hires_timer_available = FALSE; + timeBeginPeriod(1); /* use 1 ms timer precision */ + start = timeGetTime(); + } +#endif +} + +Uint32 SDL_GetTicks(void) +{ + DWORD now, ticks; +#ifndef USE_GETTICKCOUNT + LARGE_INTEGER hires_now; +#endif + +#ifdef USE_GETTICKCOUNT + now = GetTickCount(); +#else + if (hires_timer_available) + { + QueryPerformanceCounter(&hires_now); + + hires_now.QuadPart -= hires_start_ticks.QuadPart; + hires_now.QuadPart *= 1000; + hires_now.QuadPart /= hires_ticks_per_second.QuadPart; + + return (DWORD)hires_now.QuadPart; + } + else + { + now = timeGetTime(); + } +#endif + + if ( now < start ) { + ticks = (TIME_WRAP_VALUE-start) + now; + } else { + ticks = (now - start); + } + return(ticks); +} + +void SDL_Delay(Uint32 ms) +{ + Sleep(ms); +} + +/* Data to handle a single periodic alarm */ +static UINT timerID = 0; + +static void CALLBACK HandleAlarm(UINT uID, UINT uMsg, DWORD_PTR dwUser, + DWORD_PTR dw1, DWORD_PTR dw2) +{ + SDL_ThreadedTimerCheck(); +} + + +int SDL_SYS_TimerInit(void) +{ + MMRESULT result; + + /* Set timer resolution */ + result = timeBeginPeriod(TIMER_RESOLUTION); + if ( result != TIMERR_NOERROR ) { + SDL_SetError("Warning: Can't set %d ms timer resolution", + TIMER_RESOLUTION); + } + /* Allow 10 ms of drift so we don't chew on CPU */ + timerID = timeSetEvent(TIMER_RESOLUTION,1,HandleAlarm,0,TIME_PERIODIC); + if ( ! timerID ) { + SDL_SetError("timeSetEvent() failed"); + return(-1); + } + return(SDL_SetTimerThreaded(1)); +} + +void SDL_SYS_TimerQuit(void) +{ + if ( timerID ) { + timeKillEvent(timerID); + } + timeEndPeriod(TIMER_RESOLUTION); +} + +int SDL_SYS_StartTimer(void) +{ + SDL_SetError("Internal logic error: Win32 uses threaded timer"); + return(-1); +} + +void SDL_SYS_StopTimer(void) +{ + return; +} + +#endif /* SDL_TIMER_WIN32 */ |