mirror of
https://github.com/tildearrow/furnace.git
synced 2024-11-07 05:15:05 +00:00
331 lines
9.2 KiB
C++
331 lines
9.2 KiB
C++
/**
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* Furnace Tracker - multi-system chiptune tracker
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* Copyright (C) 2021-2022 tildearrow and contributors
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "ym2610ext.h"
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#include "../engine.h"
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#include <math.h>
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#include "ym2610shared.h"
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int DivPlatformYM2610Ext::dispatch(DivCommand c) {
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if (c.chan<1) {
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return DivPlatformYM2610::dispatch(c);
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}
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if (c.chan>4) {
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c.chan-=3;
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return DivPlatformYM2610::dispatch(c);
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}
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int ch=c.chan-1;
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int ordch=orderedOps[ch];
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switch (c.cmd) {
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case DIV_CMD_NOTE_ON: {
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DivInstrument* ins=parent->getIns(opChan[ch].ins);
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unsigned short baseAddr=chanOffs[1]|opOffs[ordch];
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DivInstrumentFM::Operator op=ins->fm.op[ordch];
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// TODO: how does this work?!
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if (isOpMuted[ch]) {
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rWrite(baseAddr+0x40,127);
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} else {
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if (opChan[ch].insChanged) {
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rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[ch].vol&0x7f))/127));
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}
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}
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if (opChan[ch].insChanged) {
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rWrite(baseAddr+0x30,(op.mult&15)|(dtTable[op.dt&7]<<4));
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rWrite(baseAddr+0x50,(op.ar&31)|(op.rs<<6));
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rWrite(baseAddr+0x60,(op.dr&31)|(op.am<<7));
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rWrite(baseAddr+0x70,op.d2r&31);
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rWrite(baseAddr+0x80,(op.rr&15)|(op.sl<<4));
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rWrite(baseAddr+0x90,op.ssgEnv&15);
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}
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if (opChan[ch].insChanged) { // TODO how does this work?
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rWrite(chanOffs[1]+0xb0,(ins->fm.alg&7)|(ins->fm.fb<<3));
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rWrite(chanOffs[1]+0xb4,(opChan[ch].pan<<6)|(ins->fm.fms&7)|((ins->fm.ams&3)<<4));
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}
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opChan[ch].insChanged=false;
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if (c.value!=DIV_NOTE_NULL) {
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opChan[ch].baseFreq=NOTE_FREQUENCY(c.value);
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opChan[ch].freqChanged=true;
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}
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opChan[ch].keyOn=true;
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opChan[ch].active=true;
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break;
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}
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case DIV_CMD_NOTE_OFF:
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opChan[ch].keyOff=true;
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opChan[ch].keyOn=false;
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opChan[ch].active=false;
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break;
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case DIV_CMD_VOLUME: {
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opChan[ch].vol=c.value;
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DivInstrument* ins=parent->getIns(opChan[ch].ins);
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unsigned short baseAddr=chanOffs[1]|opOffs[ordch];
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DivInstrumentFM::Operator op=ins->fm.op[ordch];
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if (isOpMuted[ch]) {
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rWrite(baseAddr+0x40,127);
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} else {
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rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[ch].vol&0x7f))/127));
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}
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break;
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}
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case DIV_CMD_GET_VOLUME: {
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return opChan[ch].vol;
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break;
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}
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case DIV_CMD_INSTRUMENT:
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if (opChan[ch].ins!=c.value || c.value2==1) {
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opChan[ch].insChanged=true;
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}
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opChan[ch].ins=c.value;
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break;
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case DIV_CMD_PANNING: {
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if (c.value==0) {
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opChan[ch].pan=3;
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} else {
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opChan[ch].pan=((c.value&15)>0)|(((c.value>>4)>0)<<1);
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}
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DivInstrument* ins=parent->getIns(opChan[ch].ins);
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// TODO: ???
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rWrite(chanOffs[1]+0xb4,(opChan[ch].pan<<6)|(ins->fm.fms&7)|((ins->fm.ams&3)<<4));
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break;
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}
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case DIV_CMD_PITCH: {
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opChan[ch].pitch=c.value;
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opChan[ch].freqChanged=true;
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break;
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}
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case DIV_CMD_NOTE_PORTA: {
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int destFreq=NOTE_FREQUENCY(c.value2);
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int newFreq;
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bool return2=false;
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if (destFreq>opChan[ch].baseFreq) {
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newFreq=opChan[ch].baseFreq+c.value*octave(opChan[ch].baseFreq);
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if (newFreq>=destFreq) {
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newFreq=destFreq;
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return2=true;
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}
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} else {
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newFreq=opChan[ch].baseFreq-c.value*octave(opChan[ch].baseFreq);
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if (newFreq<=destFreq) {
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newFreq=destFreq;
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return2=true;
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}
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}
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if (!opChan[ch].portaPause) {
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if (octave(opChan[ch].baseFreq)!=octave(newFreq)) {
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opChan[ch].portaPause=true;
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break;
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}
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}
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opChan[ch].baseFreq=newFreq;
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opChan[ch].portaPause=false;
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opChan[ch].freqChanged=true;
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if (return2) return 2;
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break;
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}
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case DIV_CMD_LEGATO: {
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opChan[ch].baseFreq=NOTE_FREQUENCY(c.value);
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opChan[ch].freqChanged=true;
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break;
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}
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case DIV_CMD_FM_MULT: { // TODO
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unsigned short baseAddr=chanOffs[1]|opOffs[orderedOps[c.value]];
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DivInstrument* ins=parent->getIns(opChan[ch].ins);
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DivInstrumentFM::Operator op=ins->fm.op[orderedOps[c.value]];
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rWrite(baseAddr+0x30,(c.value2&15)|(dtTable[op.dt&7]<<4));
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break;
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}
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case DIV_CMD_FM_TL: { // TODO
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unsigned short baseAddr=chanOffs[1]|opOffs[orderedOps[c.value]];
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DivInstrument* ins=parent->getIns(opChan[ch].ins);
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if (isOutput[ins->fm.alg][c.value]) {
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rWrite(baseAddr+0x40,127-(((127-c.value2)*(opChan[ch].vol&0x7f))/127));
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} else {
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rWrite(baseAddr+0x40,c.value2);
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}
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break;
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}
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case DIV_CMD_FM_AR: {
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DivInstrument* ins=parent->getIns(opChan[ch].ins);
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if (c.value<0) {
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for (int i=0; i<4; i++) {
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DivInstrumentFM::Operator op=ins->fm.op[i];
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unsigned short baseAddr=chanOffs[1]|opOffs[i];
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rWrite(baseAddr+0x50,(c.value2&31)|(op.rs<<6));
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}
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} else {
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DivInstrumentFM::Operator op=ins->fm.op[orderedOps[c.value]];
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unsigned short baseAddr=chanOffs[1]|opOffs[orderedOps[c.value]];
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rWrite(baseAddr+0x50,(c.value2&31)|(op.rs<<6));
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}
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break;
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}
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case DIV_CMD_GET_VOLMAX:
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return 127;
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break;
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case DIV_ALWAYS_SET_VOLUME:
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return 0;
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break;
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case DIV_CMD_PRE_PORTA:
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break;
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default:
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//printf("WARNING: unimplemented command %d\n",c.cmd);
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break;
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}
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return 1;
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}
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static int opChanOffsL[4]={
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0xa9, 0xaa, 0xa8, 0xa2
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};
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static int opChanOffsH[4]={
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0xad, 0xae, 0xac, 0xa6
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};
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void DivPlatformYM2610Ext::tick() {
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if (extMode) {
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bool writeSomething=false;
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unsigned char writeMask=2;
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for (int i=0; i<4; i++) {
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writeMask|=opChan[i].active<<(4+i);
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if (opChan[i].keyOn || opChan[i].keyOff) {
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writeSomething=true;
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writeMask&=~(1<<(4+i));
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opChan[i].keyOff=false;
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}
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}
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if (writeSomething) {
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immWrite(0x28,writeMask);
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}
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}
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DivPlatformYM2610::tick();
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bool writeNoteOn=false;
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unsigned char writeMask=2;
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if (extMode) for (int i=0; i<4; i++) {
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if (opChan[i].freqChanged) {
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opChan[i].freq=parent->calcFreq(opChan[i].baseFreq,opChan[i].pitch);
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if (opChan[i].freq>262143) opChan[i].freq=262143;
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int freqt=toFreq(opChan[i].freq);
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opChan[i].freqH=freqt>>8;
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opChan[i].freqL=freqt&0xff;
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immWrite(opChanOffsH[i],opChan[i].freqH);
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immWrite(opChanOffsL[i],opChan[i].freqL);
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opChan[i].freqChanged=false;
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}
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writeMask|=opChan[i].active<<(4+i);
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if (opChan[i].keyOn) {
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writeNoteOn=true;
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writeMask|=1<<(4+i);
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opChan[i].keyOn=false;
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}
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}
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if (writeNoteOn) {
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immWrite(0x28,writeMask);
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}
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}
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void DivPlatformYM2610Ext::muteChannel(int ch, bool mute) {
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if (ch<1) {
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DivPlatformYM2610::muteChannel(ch,mute);
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return;
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}
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if (ch>4) {
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DivPlatformYM2610::muteChannel(ch-3,mute);
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return;
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}
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isOpMuted[ch-1]=mute;
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int ordch=orderedOps[ch-1];
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DivInstrument* ins=parent->getIns(opChan[ch].ins);
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unsigned short baseAddr=chanOffs[1]|opOffs[ordch];
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DivInstrumentFM::Operator op=ins->fm.op[ordch];
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if (isOpMuted[ch]) {
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rWrite(baseAddr+0x40,127);
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} else if (isOutput[ins->fm.alg][ordch]) {
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rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[ch].vol&0x7f))/127));
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} else {
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rWrite(baseAddr+0x40,op.tl);
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}
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}
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void DivPlatformYM2610Ext::forceIns() {
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DivPlatformYM2610::forceIns();
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for (int i=0; i<4; i++) {
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opChan[i].insChanged=true;
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if (opChan[i].active) {
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opChan[i].keyOn=true;
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opChan[i].freqChanged=true;
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}
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}
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}
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void* DivPlatformYM2610Ext::getChanState(int ch) {
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if (ch>=5) return &chan[ch-3];
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if (ch>=1) return &opChan[ch-1];
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return &chan[ch];
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}
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void DivPlatformYM2610Ext::reset() {
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DivPlatformYM2610::reset();
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for (int i=0; i<4; i++) {
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opChan[i]=DivPlatformYM2610Ext::OpChannel();
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opChan[i].vol=127;
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}
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// channel 2 mode
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immWrite(0x27,0x40);
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extMode=true;
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}
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bool DivPlatformYM2610Ext::keyOffAffectsArp(int ch) {
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return (ch>7);
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}
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void DivPlatformYM2610Ext::notifyInsChange(int ins) {
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DivPlatformYM2610::notifyInsChange(ins);
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for (int i=0; i<4; i++) {
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if (opChan[i].ins==ins) {
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opChan[i].insChanged=true;
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}
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}
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}
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int DivPlatformYM2610Ext::init(DivEngine* parent, int channels, int sugRate, unsigned int flags) {
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DivPlatformYM2610::init(parent,channels,sugRate,flags);
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for (int i=0; i<4; i++) {
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isOpMuted[i]=false;
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}
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reset();
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return 17;
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}
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void DivPlatformYM2610Ext::quit() {
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DivPlatformYM2610::quit();
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}
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DivPlatformYM2610Ext::~DivPlatformYM2610Ext() {
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}
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