/* * PARSEC - Frame Timing * * $Author: uberlinuxguy $ - $Date: 2004/09/15 12:25:42 $ * * Orginally written by: * Copyright (c) Markus Hadwiger 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" #ifndef SYSTEM_TARGET_WINDOWS // C library includes #include #include #include // time functions #include #include // 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" // local module header #include "sl_timer.h" // global variables for frame timing ------------------------------------------ // volatile int FrameRate; volatile int FrameCounter; volatile int RefTimeCount; volatile int RefFrameCount; // static timer vars ---------------------------------------------------------- // static refframe_t sl_timfreqsec; static hprec_t sl_timfreqfac; static int sl_timsecbase; static int sl_frmsecbase; // 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; // base frequency of gettimeofday() is 1MHz ----------------------------------- // #define BASE_FREQ 1000000.0 // init frame timing ---------------------------------------------------------- // int SYSs_InitFrameTimer() { int static init_done = FALSE; if ( init_done ) { // get high-precision time struct timeval time_timeval; struct timezone time_timezone; gettimeofday( &time_timeval, &time_timezone ); // calc refframe count for old frequency time_t secframes = ( time_timeval.tv_sec - sl_timsecbase ) * sl_timfreqsec; refframe_t refframecount = refframe_t( time_timeval.tv_usec * sl_timfreqfac + secframes ); // calc correction factor for new frequency sl_timfreqsec = FRAME_MEASURE_TIMEBASE; sl_timfreqfac = FRAME_MEASURE_TIMEBASE / BASE_FREQ; // calc offset to ensure monotonically increasing refframecount // even though we now use the new frequency secframes = ( time_timeval.tv_sec - sl_timsecbase ) * sl_timfreqsec; RefFrameCount = refframe_t( time_timeval.tv_usec * sl_timfreqfac + secframes ); refframe_count_pauseofs += RefFrameCount - refframecount; } else { // calculate factor to adjust to our time quantum sl_timfreqsec = FRAME_MEASURE_TIMEBASE; sl_timfreqfac = FRAME_MEASURE_TIMEBASE / BASE_FREQ; // set initial count SYSs_InitRefFrameCount(); init_done = TRUE; } return TRUE; } // deinit frame timing -------------------------------------------------------- // int SYSs_KillFrameTimer() { // not needed return 1; } // init reference frame counting ---------------------------------------------- // void SYSs_InitRefFrameCount() { // secbase for frame rate measurement not set sl_frmsecbase = -1; // get high-precision time struct timeval time_timeval; struct timezone time_timezone; gettimeofday( &time_timeval, &time_timezone ); // set base in seconds sl_timsecbase = (int) time_timeval.tv_sec; // calc number of elapsed reference frames int secframes = int(( time_timeval.tv_sec - sl_timsecbase ) * sl_timfreqsec ); RefFrameCount = (int)( time_timeval.tv_usec * sl_timfreqfac ) + secframes; // 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() { // get high-precision time struct timeval time_timeval; struct timezone time_timezone; gettimeofday( &time_timeval, &time_timezone ); // calc number of elapsed reference frames int secframes = int(( time_timeval.tv_sec - sl_timsecbase ) * sl_timfreqsec ); RefFrameCount = (int)( time_timeval.tv_usec * sl_timfreqfac ) + secframes; 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 ) { int basecount = SYSs_GetRefFrameCount(); while ( SYSs_GetRefFrameCount() - basecount < refframes ) { SYSs_Yield(); } } // use yield function to calculate frame rate --------------------------------- // 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 // get high-precision time struct timeval time_timeval; struct timezone time_timezone; gettimeofday( &time_timeval, &time_timezone ); // set base if not done yet if ( sl_frmsecbase == -1 ) { sl_frmsecbase = time_timeval.tv_sec; } // flush framecounter every second if ( ( time_timeval.tv_sec - sl_frmsecbase ) > 0 ) { sl_frmsecbase = time_timeval.tv_sec; FrameRate = FrameCounter; FrameCounter = 0; } return 1; } #ifdef PARSEC_SERVER REGISTER_MODULE( SL_TIMER ) { SYSs_InitFrameTimer(); } #endif #endif // !SYSTEM_TARGET_WINDOWS