mirror of
https://github.com/tildearrow/furnace.git
synced 2024-11-16 17:45:10 +00:00
275 lines
7 KiB
C++
275 lines
7 KiB
C++
#include "tia.h"
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#include "../engine.h"
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#include <string.h>
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#include <math.h>
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#define rWrite(a,v) if (!skipRegisterWrites) {tia.set(a,v); if (dumpWrites) {addWrite(a,v);} }
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void DivPlatformTIA::acquire(short* bufL, short* bufR, size_t start, size_t len) {
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tia.process(bufL+start,len);
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}
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unsigned char dealWithFreq(unsigned char shape, int base, int pitch) {
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if (base&0x80000000 && ((base&0x7fffffff)<32)) {
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return base&0x1f;
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}
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int bp=base+pitch;
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double mult=0.25*27.5*pow(2.0,double(768+bp)/(256.0*12.0));
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switch (shape) {
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case 1: // buzzy
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return ceil(31400/(30.6*mult))-1;
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break;
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case 2: // low buzzy
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return ceil(31400/(480*mult))-1;
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break;
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case 3: // flangy
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return ceil(31400/(60*mult))-1;
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break;
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case 4: case 5: // square
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return ceil(31400/(4.05*mult))-1;
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break;
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case 6: case 7: case 8: case 9: case 10: // pure buzzy/reedy/noise
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return ceil(31400/(63*mult))-1;
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break;
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case 12: case 13: // low square
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return round(31400/(4.0*3*mult))-1;
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break;
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case 14: case 15: // low pure buzzy/reedy
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return ceil(31400/(3*63*mult))-1;
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break;
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}
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return 0;
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}
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void DivPlatformTIA::tick() {
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for (int i=0; i<2; i++) {
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chan[i].std.next();
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if (chan[i].std.hadVol) {
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chan[i].outVol=chan[i].std.vol-(15-(chan[i].vol&15));
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if (chan[i].outVol<0) chan[i].outVol=0;
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if (isMuted[i]) {
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rWrite(0x19+i,0);
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} else {
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rWrite(0x19+i,chan[i].outVol&15);
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}
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}
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if (chan[i].std.hadArp) {
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if (!chan[i].inPorta) {
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if (chan[i].std.arpMode) {
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chan[i].baseFreq=0x80000000|chan[i].std.arp;
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} else {
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chan[i].baseFreq=(chan[i].note+chan[i].std.arp)<<8;
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}
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}
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chan[i].freqChanged=true;
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} else {
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if (chan[i].std.arpMode && chan[i].std.finishedArp) {
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chan[i].baseFreq=chan[i].note<<8;
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chan[i].freqChanged=true;
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}
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}
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if (chan[i].std.hadWave) {
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chan[i].shape=chan[i].std.wave&15;
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rWrite(0x15+i,chan[i].shape);
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chan[i].freqChanged=true;
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}
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if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
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if (chan[i].insChanged) {
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if (!chan[i].std.willWave) {
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chan[i].shape=4;
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rWrite(0x15+i,chan[i].shape);
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}
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chan[i].insChanged=false;
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}
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chan[i].freq=dealWithFreq(chan[i].shape,chan[i].baseFreq,chan[i].pitch);
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if ((chan[i].shape==4 || chan[i].shape==5) && !(chan[i].baseFreq&0x80000000 && ((chan[i].baseFreq&0x7fffffff)<32))) {
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if (chan[i].baseFreq<39*256) {
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rWrite(0x15+i,6);
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chan[i].freq=dealWithFreq(6,chan[i].baseFreq,chan[i].pitch);
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} else if (chan[i].baseFreq<59*256) {
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rWrite(0x15+i,12);
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chan[i].freq=dealWithFreq(12,chan[i].baseFreq,chan[i].pitch);
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} else {
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rWrite(0x15+i,chan[i].shape);
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}
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}
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if (chan[i].freq>31) chan[i].freq=31;
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if (chan[i].keyOff) {
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rWrite(0x19+i,0);
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}
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rWrite(0x17+i,chan[i].freq);
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if (chan[i].keyOn) chan[i].keyOn=false;
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if (chan[i].keyOff) chan[i].keyOff=false;
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chan[i].freqChanged=false;
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}
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}
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}
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int DivPlatformTIA::dispatch(DivCommand c) {
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switch (c.cmd) {
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case DIV_CMD_NOTE_ON: {
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DivInstrument* ins=parent->getIns(chan[c.chan].ins);
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if (c.value!=DIV_NOTE_NULL) {
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chan[c.chan].baseFreq=c.value<<8;
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chan[c.chan].freqChanged=true;
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chan[c.chan].note=c.value;
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}
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chan[c.chan].active=true;
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chan[c.chan].keyOn=true;
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rWrite(0x15+c.chan,chan[c.chan].shape);
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chan[c.chan].std.init(ins);
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if (isMuted[c.chan]) {
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rWrite(0x19+c.chan,0);
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} else {
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rWrite(0x19+c.chan,chan[c.chan].vol&15);
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}
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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].keyOff=true;
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chan[c.chan].active=false;
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chan[c.chan].std.init(NULL);
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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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if (!chan[c.chan].std.hasVol) {
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chan[c.chan].outVol=c.value;
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}
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if (isMuted[c.chan]) {
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rWrite(0x19+c.chan,0);
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} else {
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rWrite(0x19+c.chan,chan[c.chan].vol&15);
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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 chan[c.chan].vol;
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break;
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}
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case DIV_CMD_INSTRUMENT:
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if (chan[c.chan].ins!=c.value || c.value2==1) {
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chan[c.chan].insChanged=true;
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}
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chan[c.chan].ins=c.value;
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break;
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case DIV_CMD_PITCH: {
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chan[c.chan].pitch=c.value;
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chan[c.chan].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=c.value2<<8;
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bool return2=false;
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if (destFreq>chan[c.chan].baseFreq) {
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chan[c.chan].baseFreq+=c.value;
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if (chan[c.chan].baseFreq>=destFreq) {
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chan[c.chan].baseFreq=destFreq;
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return2=true;
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}
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} else {
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chan[c.chan].baseFreq-=c.value;
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if (chan[c.chan].baseFreq<=destFreq) {
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chan[c.chan].baseFreq=destFreq;
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return2=true;
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}
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}
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chan[c.chan].freqChanged=true;
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if (return2) {
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chan[c.chan].inPorta=false;
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return 2;
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}
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break;
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}
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case DIV_CMD_LEGATO: {
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chan[c.chan].baseFreq=c.value<<8;
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chan[c.chan].freqChanged=true;
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break;
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}
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case DIV_CMD_WAVE:
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chan[c.chan].shape=c.value&15;
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rWrite(0x15+c.chan,chan[c.chan].shape);
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chan[c.chan].freqChanged=true;
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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_GET_VOLMAX:
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return 15;
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break;
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case DIV_CMD_PRE_PORTA:
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chan[c.chan].std.init(parent->getIns(chan[c.chan].ins));
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chan[c.chan].inPorta=c.value;
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break;
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case DIV_CMD_PRE_NOTE:
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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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void DivPlatformTIA::muteChannel(int ch, bool mute) {
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isMuted[ch]=mute;
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if (isMuted[ch]) {
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rWrite(0x19+ch,0);
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} else {
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if (chan[ch].active) rWrite(0x19+ch,chan[ch].outVol&15);
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}
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}
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void DivPlatformTIA::forceIns() {
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for (int i=0; i<2; i++) {
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chan[i].insChanged=true;
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if (chan[i].active) {
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chan[i].freqChanged=true;
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if (!isMuted[i]) rWrite(0x19+i,chan[i].outVol&15);
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}
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}
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}
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void DivPlatformTIA::reset() {
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tia.reset();
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for (int i=0; i<2; i++) {
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chan[i]=DivPlatformTIA::Channel();
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chan[i].vol=0x0f;
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}
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}
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bool DivPlatformTIA::isStereo() {
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return false;
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}
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bool DivPlatformTIA::keyOffAffectsArp(int ch) {
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return true;
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}
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void DivPlatformTIA::notifyInsDeletion(void* ins) {
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for (int i=0; i<2; i++) {
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chan[i].std.notifyInsDeletion((DivInstrument*)ins);
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}
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}
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void DivPlatformTIA::setPAL(bool pal) {
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if (pal) {
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rate=31250;
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} else {
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rate=31400;
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}
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}
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int DivPlatformTIA::init(DivEngine* p, int channels, int sugRate, bool pal) {
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parent=p;
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dumpWrites=false;
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skipRegisterWrites=false;
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for (int i=0; i<2; i++) {
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isMuted[i]=false;
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}
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tia.channels(1,false);
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setPAL(pal);
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reset();
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return 2;
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}
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void DivPlatformTIA::quit() {
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}
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