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/* timer.c: Speed routines for Fuse
Copyright (c) 1999-2008 Philip Kendall, Marek Januszewski, Fredrick Meunier
$Id: timer.c 4023 2009-05-29 23:49:52Z fredm $
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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
Author contact information:
E-mail: philip-fuse@shadowmagic.org.uk
*/
#include <config.h>
#include "event.h"
#include "settings.h"
#include "sound.h"
#include "tape.h"
#include "timer.h"
#include "ui/ui.h"
static int timer_frame_callback_sound( libspectrum_dword last_tstates );
/*
* Routines for estimating emulation speed
*/
/* The actual time at the end of each of the last 10 emulated seconds */
static double stored_times[10];
/* Which is the next entry in 'stored_times' that we will update */
static size_t next_stored_time;
/* The number of frames until we next update 'stored_times' */
static int frames_until_update;
/* The number of time samples we have for estimating speed */
static int samples;
float current_speed = 100.0;
static double start_time;
static const int TEN_MS = 10;
int timer_event;
static void timer_frame( libspectrum_dword last_tstates, int event GCC_UNUSED,
void *user_data GCC_UNUSED );
int
timer_estimate_speed( void )
{
double current_time;
if( frames_until_update-- ) return 0;
current_time = timer_get_time();
if( current_time < 0 ) return 1;
if( samples < 10 ) {
/* If we don't have enough data, assume we're running at the desired
speed :-) */
current_speed = settings_current.emulation_speed;
} else {
current_speed = 10 * 100 /
( current_time - stored_times[ next_stored_time ] );
}
ui_statusbar_update_speed( current_speed );
stored_times[ next_stored_time ] = current_time;
next_stored_time = ( next_stored_time + 1 ) % 10;
frames_until_update =
( machine_current->timings.processor_speed /
machine_current->timings.tstates_per_frame ) - 1;
samples++;
return 0;
}
int
timer_estimate_reset( void )
{
start_time = timer_get_time(); if( start_time < 0 ) return 1;
samples = 0;
next_stored_time = 0;
frames_until_update = 0;
return 0;
}
int
timer_init( void )
{
int error;
start_time = timer_get_time(); if( start_time < 0 ) return 1;
timer_event = event_register( timer_frame, "Timer" );
if( timer_event == -1 ) return 1;
error = event_add( 0, timer_event );
if( error ) return error;
return 0;
}
void
timer_end( void )
{
event_remove_type( timer_event );
}
#ifdef SOUND_FIFO
/* Callback-style sound based timer */
#include "sound/sfifo.h"
extern sfifo_t sound_fifo;
static int
timer_frame_callback_sound( libspectrum_dword last_tstates )
{
for(;;) {
/* Sleep while fifo is full */
if( sfifo_space( &sound_fifo ) < sound_framesiz ) {
timer_sleep( TEN_MS );
} else {
break;
}
}
if( event_add( last_tstates + machine_current->timings.tstates_per_frame,
timer_event ) )
return 1;
return 0;
}
#else /* #ifdef SOUND_FIFO */
/* Blocking socket-style sound based timer */
static int
timer_frame_callback_sound( libspectrum_dword last_tstates )
{
if( event_add( last_tstates + machine_current->timings.tstates_per_frame,
timer_event ) )
return 1;
return 0;
}
#endif /* #ifdef SOUND_FIFO */
static void
timer_frame( libspectrum_dword last_tstates, int event GCC_UNUSED,
void *user_data GCC_UNUSED )
{
double current_time, difference;
long tstates;
if( sound_enabled ) {
timer_frame_callback_sound( last_tstates );
return;
}
/* If we're fastloading, just schedule another check in a frame's time
and do nothing else */
if( settings_current.fastload && tape_is_playing() ) {
libspectrum_dword next_check_time =
last_tstates + machine_current->timings.tstates_per_frame;
if( event_add( next_check_time, timer_event ) ) return;
} else {
float speed = ( settings_current.emulation_speed < 1 ?
1.0 :
settings_current.emulation_speed ) / 100.0;
while( 1 ) {
current_time = timer_get_time(); if( current_time < 0 ) return;
difference = current_time - start_time;
/* Sleep while we are still 10ms ahead */
if( difference < 0 ) {
timer_sleep( TEN_MS );
} else {
break;
}
}
current_time = timer_get_time(); if( current_time < 0 ) return;
difference = current_time - start_time;
tstates = ( ( difference + TEN_MS / 1000.0 ) *
machine_current->timings.processor_speed
) * speed + 0.5;
if( event_add( last_tstates + tstates, timer_event ) ) return;
start_time = current_time + TEN_MS / 1000.0;
}
}
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