symbian-qemu-0.9.1-12/libsdl-trunk/src/timer/win32/SDL_systimer.c
author johnathan.white@2718R8BGH51.accenture.com
Mon, 08 Mar 2010 18:45:03 +0000
changeset 46 b6935a90ca64
parent 1 2fb8b9db1c86
permissions -rw-r--r--
Modify framebuffer and NGA framebuffer to read screen size from board model dtb file. Optimise memory usuage of frame buffer Add example minigui application with hooks to profiler (which writes results to S:\). Modified NGA framebuffer to run its own dfc queue at high priority
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 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_WIN32
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include <mmsystem.h>
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#include "SDL_timer.h"
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#include "../SDL_timer_c.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 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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	{
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		hires_timer_available = TRUE;
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		QueryPerformanceCounter(&hires_start_ticks);
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	}
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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 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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	{
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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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	}
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	else
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	{
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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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void SDL_Delay(Uint32 ms)
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{
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	Sleep(ms);
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}
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/* Data to handle a single periodic alarm */
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static UINT timerID = 0;
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static void CALLBACK HandleAlarm(UINT uID,  UINT uMsg, DWORD_PTR dwUser,
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						DWORD_PTR dw1, DWORD_PTR dw2)
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{
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	SDL_ThreadedTimerCheck();
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}
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int SDL_SYS_TimerInit(void)
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{
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	MMRESULT result;
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	/* Set timer resolution */
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	result = timeBeginPeriod(TIMER_RESOLUTION);
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	if ( result != TIMERR_NOERROR ) {
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		SDL_SetError("Warning: Can't set %d ms timer resolution",
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							TIMER_RESOLUTION);
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	}
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	/* Allow 10 ms of drift so we don't chew on CPU */
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	timerID = timeSetEvent(TIMER_RESOLUTION,1,HandleAlarm,0,TIME_PERIODIC);
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	if ( ! timerID ) {
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		SDL_SetError("timeSetEvent() failed");
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		return(-1);
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	}
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	return(SDL_SetTimerThreaded(1));
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}
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void SDL_SYS_TimerQuit(void)
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{
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	if ( timerID ) {
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		timeKillEvent(timerID);
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	}
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	timeEndPeriod(TIMER_RESOLUTION);
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}
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int SDL_SYS_StartTimer(void)
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{
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	SDL_SetError("Internal logic error: Win32 uses threaded timer");
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	return(-1);
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}
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void SDL_SYS_StopTimer(void)
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{
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	return;
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}
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#endif /* SDL_TIMER_WIN32 */