genesis extended channel 3 support.
as of today Furnace is able to play most Genesis songs without trouble. bugs are expected, and fixes will arrive. are you ready?
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tildearrow
parent
d9c02531e8
commit
09ed99f0b0
6 changed files with 261 additions and 44 deletions
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@ -1,6 +1,9 @@
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#include "genesisext.h"
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#include "../engine.h"
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#include <math.h>
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#include "genesisshared.h"
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int DivPlatformGenesisExt::dispatch(DivCommand c) {
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if (c.chan<2) {
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return DivPlatformGenesis::dispatch(c);
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@ -9,33 +12,245 @@ int DivPlatformGenesisExt::dispatch(DivCommand c) {
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c.chan-=3;
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return DivPlatformGenesis::dispatch(c);
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}
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int ch=c.chan-2;
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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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chan[c.chan].freq=16.4f*pow(2.0f,((float)c.value/12.0f));
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chan[c.chan].active=true;
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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[2]|opOffs[ordch];
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DivInstrumentFM::Operator op=ins->fm.op[ordch];
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if (isOutput[ins->fm.alg][ordch]) {
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if (!opChan[ch].active || 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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} else {
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if (opChan[ch].insChanged) {
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rWrite(baseAddr+0x40,op.tl);
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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[2]+0xb0,(ins->fm.alg&7)|(ins->fm.fb<<3));
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rWrite(chanOffs[2]+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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opChan[ch].baseFreq=644.0f*pow(2.0f,((float)c.value/12.0f));
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opChan[ch].freqChanged=true;
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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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chan[c.chan].active=false;
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opChan[ch].keyOff=true;
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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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chan[c.chan].vol=c.value;
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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[2]|opOffs[ordch];
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DivInstrumentFM::Operator op=ins->fm.op[ordch];
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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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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) {
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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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switch (c.value) {
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case 0x01:
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opChan[ch].pan=1;
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break;
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case 0x10:
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opChan[ch].pan=2;
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break;
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default:
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opChan[ch].pan=3;
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break;
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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[2]+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=644.0f*pow(2.0f,((float)c.value2/12.0f));
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bool return2=false;
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if (destFreq>opChan[ch].baseFreq) {
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opChan[ch].baseFreq=opChan[ch].baseFreq+c.value*octave(opChan[ch].baseFreq);
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if (opChan[ch].baseFreq>=destFreq) {
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opChan[ch].baseFreq=destFreq;
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return2=true;
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}
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} else {
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opChan[ch].baseFreq=opChan[ch].baseFreq-c.value*octave(opChan[ch].baseFreq);
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if (opChan[ch].baseFreq<=destFreq) {
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opChan[ch].baseFreq=destFreq;
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return2=true;
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}
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}
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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_SAMPLE_MODE: {
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// ignored on extended channel 3 mode.
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break;
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}
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case DIV_CMD_LEGATO: {
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opChan[ch].baseFreq=644.0f*pow(2.0f,((float)c.value/12.0f));
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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[2]|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[2]|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[2]|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[2]|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_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 DivPlatformGenesisExt::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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writes.emplace(0x28,writeMask);
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}
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}
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DivPlatformGenesis::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=(opChan[i].baseFreq*(ONE_SEMITONE+opChan[i].pitch))/ONE_SEMITONE;
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if (opChan[i].freq>=82432) {
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opChan[i].freqH=((opChan[i].freq>>15)&7)|0x38;
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opChan[i].freqL=(opChan[i].freq>>7)&0xff;
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} else if (opChan[i].freq>=41216) {
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opChan[i].freqH=((opChan[i].freq>>14)&7)|0x30;
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opChan[i].freqL=(opChan[i].freq>>6)&0xff;
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} else if (opChan[i].freq>=20608) {
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opChan[i].freqH=((opChan[i].freq>>13)&7)|0x28;
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opChan[i].freqL=(opChan[i].freq>>5)&0xff;
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} else if (opChan[i].freq>=10304) {
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opChan[i].freqH=((opChan[i].freq>>12)&7)|0x20;
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opChan[i].freqL=(opChan[i].freq>>4)&0xff;
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} else if (opChan[i].freq>=5152) {
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opChan[i].freqH=((opChan[i].freq>>11)&7)|0x18;
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opChan[i].freqL=(opChan[i].freq>>3)&0xff;
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} else if (opChan[i].freq>=2576) {
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opChan[i].freqH=((opChan[i].freq>>10)&7)|0x10;
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opChan[i].freqL=(opChan[i].freq>>2)&0xff;
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} else if (opChan[i].freq>=1288) {
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opChan[i].freqH=((opChan[i].freq>>9)&7)|0x08;
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opChan[i].freqL=(opChan[i].freq>>1)&0xff;
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} else {
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opChan[i].freqH=(opChan[i].freq>>8)&7;
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opChan[i].freqL=opChan[i].freq&0xff;
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}
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writes.emplace(opChanOffsH[i],opChan[i].freqH);
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writes.emplace(opChanOffsL[i],opChan[i].freqL);
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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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writes.emplace(0x28,writeMask);
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}
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}
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int DivPlatformGenesisExt::init(DivEngine* parent, int channels, int sugRate) {
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DivPlatformGenesis::init(parent,channels,sugRate);
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for (int i=0; i<4; i++) {
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opChan[i].vol=127;
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}
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// channel 3 mode
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writes.emplace(0x27,0x40);
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extMode=true;
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return 13;
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}
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