src/timer/windows/SDL_systimer.c
author Sam Lantinga <slouken@libsdl.org>
Fri, 25 Mar 2011 14:45:04 -0700
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Added high resolution timing API: SDL_GetPerformanceCounter(), SDL_GetPerformanceFrequency()
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2011 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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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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#ifdef _WIN32_WCE
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#error This is WinCE. Please use src/timer/wince/SDL_systimer.c instead.
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#endif
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#define TIME_WRAP_VALUE	(~(DWORD)0)
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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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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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#if 0                           /* Apparently there are problems with QPC on Win2K */
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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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#endif
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    {
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        hires_timer_available = FALSE;
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        timeBeginPeriod(1);     /* use 1 ms timer precision */
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        start = timeGetTime();
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    }
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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, ticks;
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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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        now = timeGetTime();
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    }
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#endif
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    if (now < start) {
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        ticks = (TIME_WRAP_VALUE - start) + now;
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    } else {
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        ticks = (now - start);
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    }
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    return (ticks);
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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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void
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SDL_Delay(Uint32 ms)
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{
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    Sleep(ms);
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}
74212992fb08 Initial revision
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e8916fe9cfc8 Fixed bug #925
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#endif /* SDL_TIMER_WINDOWS */
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c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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/* vi: set ts=4 sw=4 expandtab: */