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/*
* PARSEC - Frame Timing
*
* Orginally written by:
* Copyright (c) Markus Hadwiger <msh@parsec.org> 1998-2000
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#ifdef SYSTEM_TARGET_WINDOWS
// C library includes
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// time functions
// compilation flags/debug support
#include "debug.h"
// general definitions
#include "general.h"
#include "objstruc.h"
// global externals
#include "globals.h"
// subsystem headers
#ifdef PARSEC_CLIENT
#include "aud_defs.h"
#include "inp_defs.h"
#endif //PARSEC_CLIENT
#include "sys_defs.h"
// windows headers
#include <windows.h>
// local module header
#include "sw_timer.h"
// global variables for frame timing ------------------------------------------
//
volatile int FrameRate;
volatile int FrameCounter;
volatile int RefTimeCount;
volatile int RefFrameCount;
// timer vars -----------------------------------------------------------------
//
MMRESULT sw_SecTimerID; // ID of the timer that is called each second
__int64 sw_curTimer; // current timer value
hprec_t sw_dTimerFreqFac; // factor from timer to refframes
__int64 sw_TimerFreq; // frequency of performance timer
// reference frame count pausing ----------------------------------------------
//
static int refframe_count_paused = FALSE;
static refframe_t refframe_count_pauseval = REFFRAME_INVALID;
static refframe_t refframe_count_pauseofs = 0;
// callback for Sec.Timer to set the current framerate -----------------------
//
void CALLBACK
SW_SecTimeProc( UINT uID, UINT uMsg, DWORD dwUser, DWORD dw1, DWORD dw2 )
{
FrameRate = FrameCounter;
FrameCounter = 0;
}
// init frame timer handler ---------------------------------------------------
//
int SYSs_InitFrameTimer()
{
int static init_done = FALSE;
if ( init_done ) {
// calc refframe count for old frequency
QueryPerformanceCounter( (LARGE_INTEGER*) &sw_curTimer );
refframe_t refframecount = (int) ( sw_curTimer * sw_dTimerFreqFac );
// calc correction factor for new frequency
sw_dTimerFreqFac = (hprec_t)FRAME_MEASURE_TIMEBASE / sw_TimerFreq;
// calc offset to ensure monotonically increasing refframecount
// even though we now use the new frequency
RefFrameCount = (int) ( sw_curTimer * sw_dTimerFreqFac );
refframe_count_pauseofs += RefFrameCount - refframecount;
} else {
// query the frequency of the performance counter and calculate
// the factor to adjust to our FRAME_MEASURE_TIMEBASE
QueryPerformanceFrequency( (LARGE_INTEGER *) &sw_TimerFreq );
sw_dTimerFreqFac = (hprec_t)FRAME_MEASURE_TIMEBASE / sw_TimerFreq;
// create the timer which is called every second
sw_SecTimerID = timeSetEvent( 1000, 0, &SW_SecTimeProc, 0, TIME_PERIODIC );
// set initial count
SYSs_InitRefFrameCount();
init_done = TRUE;
}
return 1;
}
// de-init frame timer handler ------------------------------------------------
//
int SYSs_KillFrameTimer()
{
// terminate the seconds timer
timeKillEvent( sw_SecTimerID );
return 1;
}
// init reference frame counting ----------------------------------------------
//
void SYSs_InitRefFrameCount()
{
SYSs_GetRefFrameCount();
// init refframe count pausing/offset
refframe_count_paused = FALSE;
refframe_count_pauseval = REFFRAME_INVALID;
refframe_count_pauseofs = 0;
}
// get count of current reference frame ---------------------------------------
//
refframe_t SYSs_GetRefFrameCount()
{
QueryPerformanceCounter( (LARGE_INTEGER*) &sw_curTimer );
RefFrameCount = (int) ( sw_curTimer * sw_dTimerFreqFac );
return RefFrameCount - refframe_count_pauseofs;
}
// pause reference frame counting ---------------------------------------------
//
void SYSs_PauseRefFrameCount()
{
if ( !refframe_count_paused ) {
SYSs_GetRefFrameCount();
refframe_count_pauseval = RefFrameCount;
refframe_count_paused = TRUE;
}
}
// resume reference frame counting --------------------------------------------
//
void SYSs_ResumeRefFrameCount()
{
if ( refframe_count_paused ) {
SYSs_GetRefFrameCount();
refframe_count_pauseofs += RefFrameCount - refframe_count_pauseval;
refframe_count_pauseval = REFFRAME_INVALID;
refframe_count_paused = FALSE;
}
}
// wait for specified number of reference frames ------------------------------
//
void SYSs_Wait( refframe_t refframes )
{
refframe_t basecount = SYSs_GetRefFrameCount();
while ( SYSs_GetRefFrameCount() - basecount < refframes ) {
SYSs_Yield();
}
}
// guaranteed to be called once per frame -------------------------------------
//
int SYSs_Yield()
{
#ifdef PARSEC_CLIENT
// yield to sound driver
AUDs_MaintainSound();
// must be called to retrieve key strokes from buffer
INPs_Collect();
#endif // PARSEC_CLIENT
return 1;
}
#ifdef PARSEC_SERVER
REGISTER_MODULE( SW_TIMER )
{
SYSs_InitFrameTimer();
}
#endif // PARSEC_SERVER
#endif // SYSTEM_TARGET_WINDOWS
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