161 lines
3.7 KiB
C++
161 lines
3.7 KiB
C++
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// Nes_Snd_Emu 0.1.7. http://www.slack.net/~ant/libs/
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#include "Nes_Namco.h"
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/* Copyright (C) 2003-2005 Shay Green. This module is free software; you
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can redistribute it and/or modify it under the terms of the GNU Lesser
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General Public 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. This
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module is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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more details. You should have received a copy of the GNU Lesser General
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Public License along with this module; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#include BLARGG_SOURCE_BEGIN
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Nes_Namco::Nes_Namco()
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{
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output( NULL );
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volume( 1.0 );
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reset();
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}
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Nes_Namco::~Nes_Namco()
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{
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}
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void Nes_Namco::reset()
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{
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addr_reg = 0;
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int i;
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for ( i = 0; i < reg_count; i++ )
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reg [i] = 0;
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for ( i = 0; i < osc_count; i++ )
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{
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Namco_Osc& osc = oscs [i];
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osc.delay = 0;
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osc.last_amp = 0;
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osc.wave_pos = 0;
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}
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}
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void Nes_Namco::output( Blip_Buffer* buf )
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{
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for ( int i = 0; i < osc_count; i++ )
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osc_output( i, buf );
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}
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BOOST::uint8_t& Nes_Namco::access()
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{
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int addr = addr_reg & 0x7f;
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if ( addr_reg & 0x80 )
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addr_reg = (addr + 1) | 0x80;
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return reg [addr];
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}
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/*
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void Nes_Namco::reflect_state( Tagged_Data& data )
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{
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reflect_int16( data, 'ADDR', &addr_reg );
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static const char hex [17] = "0123456789ABCDEF";
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int i;
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for ( i = 0; i < reg_count; i++ )
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reflect_int16( data, 'RG\0\0' + hex [i >> 4] * 0x100 + hex [i & 15], ® [i] );
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for ( i = 0; i < osc_count; i++ )
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{
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reflect_int32( data, 'DLY0' + i, &oscs [i].delay );
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reflect_int16( data, 'POS0' + i, &oscs [i].wave_pos );
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}
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}
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*/
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void Nes_Namco::end_frame( cpu_time_t time )
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{
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if ( time > last_time )
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run_until( time );
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last_time -= time;
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assert( last_time >= 0 );
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}
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#include BLARGG_ENABLE_OPTIMIZER
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void Nes_Namco::run_until( cpu_time_t nes_end_time )
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{
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int active_oscs = ((reg [0x7f] >> 4) & 7) + 1;
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for ( int i = osc_count - active_oscs; i < osc_count; i++ )
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{
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Namco_Osc& osc = oscs [i];
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Blip_Buffer* output = osc.output;
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if ( !output )
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continue;
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Blip_Buffer::resampled_time_t time =
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output->resampled_time( last_time ) + osc.delay;
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Blip_Buffer::resampled_time_t end_time = output->resampled_time( nes_end_time );
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osc.delay = 0;
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if ( time < end_time )
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{
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const BOOST::uint8_t* osc_reg = ® [i * 8 + 0x40];
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if ( !(osc_reg [4] & 0xe0) )
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continue;
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int volume = osc_reg [7] & 15;
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if ( !volume )
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continue;
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long freq = (osc_reg [4] & 3) * 0x10000 + osc_reg [2] * 0x100L + osc_reg [0];
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if ( !freq )
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continue;
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Blip_Buffer::resampled_time_t period =
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output->resampled_duration( 983040 ) / freq * active_oscs;
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int wave_size = (8 - ((osc_reg [4] >> 2) & 7)) * 4;
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if ( !wave_size )
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continue;
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int last_amp = osc.last_amp;
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int wave_pos = osc.wave_pos;
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do
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{
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// read wave sample
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int addr = wave_pos + osc_reg [6];
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int sample = reg [addr >> 1];
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wave_pos++;
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if ( addr & 1 )
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sample >>= 4;
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sample = (sample & 15) * volume;
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// output impulse if amplitude changed
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int delta = sample - last_amp;
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if ( delta )
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{
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last_amp = sample;
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synth.offset_resampled( time, delta, output );
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}
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// next sample
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time += period;
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if ( wave_pos >= wave_size )
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wave_pos = 0;
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}
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while ( time < end_time );
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osc.wave_pos = wave_pos;
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osc.last_amp = last_amp;
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}
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osc.delay = time - end_time;
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}
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last_time = nes_end_time;
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}
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