diff options
Diffstat (limited to 'plugins/gme/game-music-emu-svn/gme/Nes_Namco_Apu.cpp')
| -rw-r--r-- | plugins/gme/game-music-emu-svn/gme/Nes_Namco_Apu.cpp | 145 |
1 files changed, 0 insertions, 145 deletions
diff --git a/plugins/gme/game-music-emu-svn/gme/Nes_Namco_Apu.cpp b/plugins/gme/game-music-emu-svn/gme/Nes_Namco_Apu.cpp deleted file mode 100644 index f3235b38..00000000 --- a/plugins/gme/game-music-emu-svn/gme/Nes_Namco_Apu.cpp +++ /dev/null @@ -1,145 +0,0 @@ -// Nes_Snd_Emu 0.1.8. http://www.slack.net/~ant/ - -#include "Nes_Namco_Apu.h" - -/* Copyright (C) 2003-2006 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" - -Nes_Namco_Apu::Nes_Namco_Apu() -{ - output( NULL ); - volume( 1.0 ); - reset(); -} - -void Nes_Namco_Apu::reset() -{ - last_time = 0; - addr_reg = 0; - - int i; - for ( i = 0; i < reg_count; i++ ) - reg [i] = 0; - - for ( i = 0; i < osc_count; i++ ) - { - Namco_Osc& osc = oscs [i]; - osc.delay = 0; - osc.last_amp = 0; - osc.wave_pos = 0; - } -} - -void Nes_Namco_Apu::output( Blip_Buffer* buf ) -{ - for ( int i = 0; i < osc_count; i++ ) - osc_output( i, buf ); -} - -/* -void Nes_Namco_Apu::reflect_state( Tagged_Data& data ) -{ - reflect_int16( data, BLARGG_4CHAR('A','D','D','R'), &addr_reg ); - - static const char hex [17] = "0123456789ABCDEF"; - int i; - for ( i = 0; i < reg_count; i++ ) - reflect_int16( data, 'RG\0\0' + hex [i >> 4] * 0x100 + hex [i & 15], ® [i] ); - - for ( i = 0; i < osc_count; i++ ) - { - reflect_int32( data, BLARGG_4CHAR('D','L','Y','0') + i, &oscs [i].delay ); - reflect_int16( data, BLARGG_4CHAR('P','O','S','0') + i, &oscs [i].wave_pos ); - } -} -*/ - -void Nes_Namco_Apu::end_frame( blip_time_t time ) -{ - if ( time > last_time ) - run_until( time ); - - assert( last_time >= time ); - last_time -= time; -} - -void Nes_Namco_Apu::run_until( blip_time_t nes_end_time ) -{ - int active_oscs = (reg [0x7F] >> 4 & 7) + 1; - for ( int i = osc_count - active_oscs; i < osc_count; i++ ) - { - Namco_Osc& osc = oscs [i]; - Blip_Buffer* output = osc.output; - if ( !output ) - continue; - output->set_modified(); - - blip_resampled_time_t time = - output->resampled_time( last_time ) + osc.delay; - blip_resampled_time_t end_time = output->resampled_time( nes_end_time ); - osc.delay = 0; - if ( time < end_time ) - { - const BOOST::uint8_t* osc_reg = ® [i * 8 + 0x40]; - if ( !(osc_reg [4] & 0xE0) ) - continue; - - int volume = osc_reg [7] & 15; - if ( !volume ) - continue; - - blargg_long freq = (osc_reg [4] & 3) * 0x10000 + osc_reg [2] * 0x100L + osc_reg [0]; - if ( freq < 64 * active_oscs ) - continue; // prevent low frequencies from excessively delaying freq changes - blip_resampled_time_t period = - output->resampled_duration( 983040 ) / freq * active_oscs; - - int wave_size = 32 - (osc_reg [4] >> 2 & 7) * 4; - if ( !wave_size ) - continue; - - int last_amp = osc.last_amp; - int wave_pos = osc.wave_pos; - - do - { - // read wave sample - int addr = wave_pos + osc_reg [6]; - int sample = reg [addr >> 1] >> (addr << 2 & 4); - wave_pos++; - sample = (sample & 15) * volume; - - // output impulse if amplitude changed - int delta = sample - last_amp; - if ( delta ) - { - last_amp = sample; - synth.offset_resampled( time, delta, output ); - } - - // next sample - time += period; - if ( wave_pos >= wave_size ) - wave_pos = 0; - } - while ( time < end_time ); - - osc.wave_pos = wave_pos; - osc.last_amp = last_amp; - } - osc.delay = time - end_time; - } - - last_time = nes_end_time; -} - |