185 lines
4.3 KiB
C
185 lines
4.3 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_config.h"
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#ifdef SDL_TIMER_WINDOWS
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#include "../../core/windows/SDL_windows.h"
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#include <mmsystem.h>
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#include "SDL_timer.h"
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#include "SDL_hints.h"
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/* The first (low-resolution) ticks value of the application */
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static DWORD start;
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#ifndef USE_GETTICKCOUNT
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/* Store if a high-resolution performance counter exists on the system */
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static BOOL hires_timer_available;
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/* The first high-resolution ticks value of the application */
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static LARGE_INTEGER hires_start_ticks;
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/* The number of ticks per second of the high-resolution performance counter */
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static LARGE_INTEGER hires_ticks_per_second;
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#endif
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#ifndef __WINRT__
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static void
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timeSetPeriod(UINT uPeriod)
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{
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static UINT timer_period = 0;
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if (uPeriod != timer_period) {
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if (timer_period) {
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timeEndPeriod(timer_period);
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}
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timer_period = uPeriod;
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if (timer_period) {
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timeBeginPeriod(timer_period);
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}
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}
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}
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static void
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SDL_TimerResolutionChanged(void *userdata, const char *name, const char *oldValue, const char *hint)
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{
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UINT uPeriod;
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/* Unless the hint says otherwise, let's have good sleep precision */
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if (hint && *hint) {
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uPeriod = SDL_atoi(hint);
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} else {
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uPeriod = 1;
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}
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if (uPeriod || oldValue != hint) {
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timeSetPeriod(uPeriod);
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}
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}
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#endif /* ifndef __WINRT__ */
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void
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SDL_StartTicks(void)
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{
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/* Set first ticks value */
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#ifdef USE_GETTICKCOUNT
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start = GetTickCount();
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#else
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/* QueryPerformanceCounter has had problems in the past, but lots of games
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use it, so we'll rely on it here.
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*/
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if (QueryPerformanceFrequency(&hires_ticks_per_second) == TRUE) {
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hires_timer_available = TRUE;
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QueryPerformanceCounter(&hires_start_ticks);
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} else {
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hires_timer_available = FALSE;
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#ifdef __WINRT__
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start = 0; /* the timer failed to start! */
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#else
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timeSetPeriod(1); /* use 1 ms timer precision */
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start = timeGetTime();
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#endif /* ifdef __WINRT__ */
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}
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#endif
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#ifndef __WINRT__
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SDL_AddHintCallback(SDL_HINT_TIMER_RESOLUTION,
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SDL_TimerResolutionChanged, NULL);
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#endif
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}
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Uint32
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SDL_GetTicks(void)
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{
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DWORD now;
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#ifndef USE_GETTICKCOUNT
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LARGE_INTEGER hires_now;
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#endif
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#ifdef USE_GETTICKCOUNT
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now = GetTickCount();
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#else
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if (hires_timer_available) {
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QueryPerformanceCounter(&hires_now);
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hires_now.QuadPart -= hires_start_ticks.QuadPart;
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hires_now.QuadPart *= 1000;
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hires_now.QuadPart /= hires_ticks_per_second.QuadPart;
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return (DWORD) hires_now.QuadPart;
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} else {
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#ifdef __WINRT__
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now = 0;
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#else
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now = timeGetTime();
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#endif // ifdef __WINRT__
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}
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#endif
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return (now - start);
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}
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Uint64
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SDL_GetPerformanceCounter(void)
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{
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LARGE_INTEGER counter;
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if (!QueryPerformanceCounter(&counter)) {
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return SDL_GetTicks();
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}
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return counter.QuadPart;
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}
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Uint64
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SDL_GetPerformanceFrequency(void)
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{
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LARGE_INTEGER frequency;
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if (!QueryPerformanceFrequency(&frequency)) {
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return 1000;
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}
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return frequency.QuadPart;
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}
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#ifdef __WINRT__
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static void
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Sleep(DWORD timeout)
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{
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static HANDLE mutex = 0;
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if ( ! mutex )
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{
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mutex = CreateEventEx(0, 0, 0, EVENT_ALL_ACCESS);
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}
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WaitForSingleObjectEx(mutex, timeout, FALSE);
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}
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#endif
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void
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SDL_Delay(Uint32 ms)
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{
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Sleep(ms);
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}
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#endif /* SDL_TIMER_WINDOWS */
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/* vi: set ts=4 sw=4 expandtab: */
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