mirror of
https://github.com/ZDoom/gzdoom.git
synced 2024-12-01 08:21:46 +00:00
316 lines
7.7 KiB
C++
316 lines
7.7 KiB
C++
|
// Game_Music_Emu 0.5.2. http://www.slack.net/~ant/
|
||
|
|
|
||
|
|
#include "Hes_Apu.h"
|
||
|
|
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
/* Copyright (C) 2006 Shay Green. This module is free software; you
|
||
|
|
can redistribute it and/or modify it under the terms of the GNU Lesser
|
||
|
|
General Public License as published by the Free Software Foundation; either
|
||
|
|
version 2.1 of the License, or (at your option) any later version. This
|
||
|
|
module 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 Lesser General Public License for more
|
||
|
|
details. You should have received a copy of the GNU Lesser General Public
|
||
|
|
License along with this module; if not, write to the Free Software Foundation,
|
||
|
|
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
|
||
|
|
|
||
|
|
#include "blargg_source.h"
|
||
|
|
|
||
|
|
bool const center_waves = true; // reduces asymmetry and clamping when starting notes
|
||
|
|
|
||
|
|
Hes_Apu::Hes_Apu()
|
||
|
|
{
|
||
|
|
Hes_Osc* osc = &oscs [osc_count];
|
||
|
|
do
|
||
|
|
{
|
||
|
|
osc--;
|
||
|
|
osc->outputs [0] = 0;
|
||
|
|
osc->outputs [1] = 0;
|
||
|
|
osc->chans [0] = 0;
|
||
|
|
osc->chans [1] = 0;
|
||
|
|
osc->chans [2] = 0;
|
||
|
|
}
|
||
|
|
while ( osc != oscs );
|
||
|
|
|
||
|
|
reset();
|
||
|
|
}
|
||
|
|
|
||
|
|
void Hes_Apu::reset()
|
||
|
|
{
|
||
|
|
latch = 0;
|
||
|
|
balance = 0xFF;
|
||
|
|
|
||
|
|
Hes_Osc* osc = &oscs [osc_count];
|
||
|
|
do
|
||
|
|
{
|
||
|
|
osc--;
|
||
|
|
memset( osc, 0, offsetof (Hes_Osc,outputs) );
|
||
|
|
osc->noise_lfsr = 1;
|
||
|
|
osc->control = 0x40;
|
||
|
|
osc->balance = 0xFF;
|
||
|
|
}
|
||
|
|
while ( osc != oscs );
|
||
|
|
}
|
||
|
|
|
||
|
|
void Hes_Apu::osc_output( int index, Blip_Buffer* center, Blip_Buffer* left, Blip_Buffer* right )
|
||
|
|
{
|
||
|
|
require( (unsigned) index < osc_count );
|
||
|
|
oscs [index].chans [0] = center;
|
||
|
|
oscs [index].chans [1] = left;
|
||
|
|
oscs [index].chans [2] = right;
|
||
|
|
|
||
|
|
Hes_Osc* osc = &oscs [osc_count];
|
||
|
|
do
|
||
|
|
{
|
||
|
|
osc--;
|
||
|
|
balance_changed( *osc );
|
||
|
|
}
|
||
|
|
while ( osc != oscs );
|
||
|
|
}
|
||
|
|
|
||
|
|
void Hes_Osc::run_until( synth_t& synth_, blip_time_t end_time )
|
||
|
|
{
|
||
|
|
Blip_Buffer* const osc_outputs_0 = outputs [0]; // cache often-used values
|
||
|
|
if ( osc_outputs_0 && control & 0x80 )
|
||
|
|
{
|
||
|
|
int dac = this->dac;
|
||
|
|
|
||
|
|
int const volume_0 = volume [0];
|
||
|
|
{
|
||
|
|
int delta = dac * volume_0 - last_amp [0];
|
||
|
|
if ( delta )
|
||
|
|
synth_.offset( last_time, delta, osc_outputs_0 );
|
||
|
|
osc_outputs_0->set_modified();
|
||
|
|
}
|
||
|
|
|
||
|
|
Blip_Buffer* const osc_outputs_1 = outputs [1];
|
||
|
|
int const volume_1 = volume [1];
|
||
|
|
if ( osc_outputs_1 )
|
||
|
|
{
|
||
|
|
int delta = dac * volume_1 - last_amp [1];
|
||
|
|
if ( delta )
|
||
|
|
synth_.offset( last_time, delta, osc_outputs_1 );
|
||
|
|
osc_outputs_1->set_modified();
|
||
|
|
}
|
||
|
|
|
||
|
|
blip_time_t time = last_time + delay;
|
||
|
|
if ( time < end_time )
|
||
|
|
{
|
||
|
|
if ( noise & 0x80 )
|
||
|
|
{
|
||
|
|
if ( volume_0 | volume_1 )
|
||
|
|
{
|
||
|
|
// noise
|
||
|
|
int const period = (32 - (noise & 0x1F)) * 64; // TODO: correct?
|
||
|
|
unsigned noise_lfsr = this->noise_lfsr;
|
||
|
|
do
|
||
|
|
{
|
||
|
|
int new_dac = 0x1F & (unsigned)-(signed)(noise_lfsr >> 1 & 1);
|
||
|
|
// Implemented using "Galios configuration"
|
||
|
|
// TODO: find correct LFSR algorithm
|
||
|
|
noise_lfsr = (noise_lfsr >> 1) ^ (0xE008 & (unsigned)-(signed)(noise_lfsr & 1));
|
||
|
|
//noise_lfsr = (noise_lfsr >> 1) ^ (0x6000 & -(noise_lfsr & 1));
|
||
|
|
int delta = new_dac - dac;
|
||
|
|
if ( delta )
|
||
|
|
{
|
||
|
|
dac = new_dac;
|
||
|
|
synth_.offset( time, delta * volume_0, osc_outputs_0 );
|
||
|
|
if ( osc_outputs_1 )
|
||
|
|
synth_.offset( time, delta * volume_1, osc_outputs_1 );
|
||
|
|
}
|
||
|
|
time += period;
|
||
|
|
}
|
||
|
|
while ( time < end_time );
|
||
|
|
|
||
|
|
this->noise_lfsr = noise_lfsr;
|
||
|
|
assert( noise_lfsr );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else if ( !(control & 0x40) )
|
||
|
|
{
|
||
|
|
// wave
|
||
|
|
int phase = (this->phase + 1) & 0x1F; // pre-advance for optimal inner loop
|
||
|
|
int period = this->period * 2;
|
||
|
|
if ( period >= 14 && (volume_0 | volume_1) )
|
||
|
|
{
|
||
|
|
do
|
||
|
|
{
|
||
|
|
int new_dac = wave [phase];
|
||
|
|
phase = (phase + 1) & 0x1F;
|
||
|
|
int delta = new_dac - dac;
|
||
|
|
if ( delta )
|
||
|
|
{
|
||
|
|
dac = new_dac;
|
||
|
|
synth_.offset( time, delta * volume_0, osc_outputs_0 );
|
||
|
|
if ( osc_outputs_1 )
|
||
|
|
synth_.offset( time, delta * volume_1, osc_outputs_1 );
|
||
|
|
}
|
||
|
|
time += period;
|
||
|
|
}
|
||
|
|
while ( time < end_time );
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if ( !period )
|
||
|
|
{
|
||
|
|
// TODO: Gekisha Boy assumes that period = 0 silences wave
|
||
|
|
//period = 0x1000 * 2;
|
||
|
|
period = 1;
|
||
|
|
//if ( !(volume_0 | volume_1) )
|
||
|
|
// dprintf( "Used period 0\n" );
|
||
|
|
}
|
||
|
|
|
||
|
|
// maintain phase when silent
|
||
|
|
blargg_long count = (end_time - time + period - 1) / period;
|
||
|
|
phase += count; // phase will be masked below
|
||
|
|
time += count * period;
|
||
|
|
}
|
||
|
|
this->phase = (phase - 1) & 0x1F; // undo pre-advance
|
||
|
|
}
|
||
|
|
}
|
||
|
|
time -= end_time;
|
||
|
|
if ( time < 0 )
|
||
|
|
time = 0;
|
||
|
|
delay = time;
|
||
|
|
|
||
|
|
this->dac = dac;
|
||
|
|
last_amp [0] = dac * volume_0;
|
||
|
|
last_amp [1] = dac * volume_1;
|
||
|
|
}
|
||
|
|
last_time = end_time;
|
||
|
|
}
|
||
|
|
|
||
|
|
void Hes_Apu::balance_changed( Hes_Osc& osc )
|
||
|
|
{
|
||
|
|
static short const log_table [32] = { // ~1.5 db per step
|
||
|
|
#define ENTRY( factor ) short (factor * Hes_Osc::amp_range / 31.0 + 0.5)
|
||
|
|
ENTRY( 0.000000 ),ENTRY( 0.005524 ),ENTRY( 0.006570 ),ENTRY( 0.007813 ),
|
||
|
|
ENTRY( 0.009291 ),ENTRY( 0.011049 ),ENTRY( 0.013139 ),ENTRY( 0.015625 ),
|
||
|
|
ENTRY( 0.018581 ),ENTRY( 0.022097 ),ENTRY( 0.026278 ),ENTRY( 0.031250 ),
|
||
|
|
ENTRY( 0.037163 ),ENTRY( 0.044194 ),ENTRY( 0.052556 ),ENTRY( 0.062500 ),
|
||
|
|
ENTRY( 0.074325 ),ENTRY( 0.088388 ),ENTRY( 0.105112 ),ENTRY( 0.125000 ),
|
||
|
|
ENTRY( 0.148651 ),ENTRY( 0.176777 ),ENTRY( 0.210224 ),ENTRY( 0.250000 ),
|
||
|
|
ENTRY( 0.297302 ),ENTRY( 0.353553 ),ENTRY( 0.420448 ),ENTRY( 0.500000 ),
|
||
|
|
ENTRY( 0.594604 ),ENTRY( 0.707107 ),ENTRY( 0.840896 ),ENTRY( 1.000000 ),
|
||
|
|
#undef ENTRY
|
||
|
|
};
|
||
|
|
|
||
|
|
int vol = (osc.control & 0x1F) - 0x1E * 2;
|
||
|
|
|
||
|
|
int left = vol + (osc.balance >> 3 & 0x1E) + (balance >> 3 & 0x1E);
|
||
|
|
if ( left < 0 ) left = 0;
|
||
|
|
|
||
|
|
int right = vol + (osc.balance << 1 & 0x1E) + (balance << 1 & 0x1E);
|
||
|
|
if ( right < 0 ) right = 0;
|
||
|
|
|
||
|
|
left = log_table [left ];
|
||
|
|
right = log_table [right];
|
||
|
|
|
||
|
|
// optimizing for the common case of being centered also allows easy
|
||
|
|
// panning using Effects_Buffer
|
||
|
|
osc.outputs [0] = osc.chans [0]; // center
|
||
|
|
osc.outputs [1] = 0;
|
||
|
|
if ( left != right )
|
||
|
|
{
|
||
|
|
osc.outputs [0] = osc.chans [1]; // left
|
||
|
|
osc.outputs [1] = osc.chans [2]; // right
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( center_waves )
|
||
|
|
{
|
||
|
|
osc.last_amp [0] += (left - osc.volume [0]) * 16;
|
||
|
|
osc.last_amp [1] += (right - osc.volume [1]) * 16;
|
||
|
|
}
|
||
|
|
|
||
|
|
osc.volume [0] = left;
|
||
|
|
osc.volume [1] = right;
|
||
|
|
}
|
||
|
|
|
||
|
|
void Hes_Apu::write_data( blip_time_t time, int addr, int data )
|
||
|
|
{
|
||
|
|
if ( addr == 0x800 )
|
||
|
|
{
|
||
|
|
latch = data & 7;
|
||
|
|
}
|
||
|
|
else if ( addr == 0x801 )
|
||
|
|
{
|
||
|
|
if ( balance != data )
|
||
|
|
{
|
||
|
|
balance = data;
|
||
|
|
|
||
|
|
Hes_Osc* osc = &oscs [osc_count];
|
||
|
|
do
|
||
|
|
{
|
||
|
|
osc--;
|
||
|
|
osc->run_until( synth, time );
|
||
|
|
balance_changed( *oscs );
|
||
|
|
}
|
||
|
|
while ( osc != oscs );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else if ( latch < osc_count )
|
||
|
|
{
|
||
|
|
Hes_Osc& osc = oscs [latch];
|
||
|
|
osc.run_until( synth, time );
|
||
|
|
switch ( addr )
|
||
|
|
{
|
||
|
|
case 0x802:
|
||
|
|
osc.period = (osc.period & 0xF00) | data;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 0x803:
|
||
|
|
osc.period = (osc.period & 0x0FF) | ((data & 0x0F) << 8);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 0x804:
|
||
|
|
if ( osc.control & 0x40 & ~data )
|
||
|
|
osc.phase = 0;
|
||
|
|
osc.control = data;
|
||
|
|
balance_changed( osc );
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 0x805:
|
||
|
|
osc.balance = data;
|
||
|
|
balance_changed( osc );
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 0x806:
|
||
|
|
data &= 0x1F;
|
||
|
|
if ( !(osc.control & 0x40) )
|
||
|
|
{
|
||
|
|
osc.wave [osc.phase] = data;
|
||
|
|
osc.phase = (osc.phase + 1) & 0x1F;
|
||
|
|
}
|
||
|
|
else if ( osc.control & 0x80 )
|
||
|
|
{
|
||
|
|
osc.dac = data;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 0x807:
|
||
|
|
if ( &osc >= &oscs [4] )
|
||
|
|
osc.noise = data;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 0x809:
|
||
|
|
if ( !(data & 0x80) && (data & 0x03) != 0 )
|
||
|
|
dprintf( "HES LFO not supported\n" );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void Hes_Apu::end_frame( blip_time_t end_time )
|
||
|
|
{
|
||
|
|
Hes_Osc* osc = &oscs [osc_count];
|
||
|
|
do
|
||
|
|
{
|
||
|
|
osc--;
|
||
|
|
if ( end_time > osc->last_time )
|
||
|
|
osc->run_until( synth, end_time );
|
||
|
|
assert( osc->last_time >= end_time );
|
||
|
|
osc->last_time -= end_time;
|
||
|
|
}
|
||
|
|
while ( osc != oscs );
|
||
|
|
}
|