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furnace/src/engine/platform/nes.cpp

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#include "nes.h"
#include "sound/nes/cpu_inline.h"
#include "../engine.h"
#include <math.h>
#define FREQ_BASE 3424.0f
void DivPlatformNES::acquire(short* bufL, short* bufR, size_t start, size_t len) {
for (size_t i=start; i<start+len; i++) {
if (dacSample!=-1) {
dacPeriod+=dacRate;
if (dacPeriod>=rate) {
DivSample* s=parent->song.sample[dacSample];
if (s->depth==8) {
apu_wr_reg(0x4011,((unsigned char)s->rendData[dacPos++]+0x80)>>1);
} else {
apu_wr_reg(0x4011,((unsigned short)s->rendData[dacPos++]+0x8000)>>9);
}
if (dacPos>=s->rendLength) {
dacSample=-1;
}
dacPeriod-=rate;
}
}
apu_tick(NULL);
apu.odd_cycle=!apu.odd_cycle;
if (apu.clocked) {
apu.clocked=false;
}
bufL[i]=(pulse_output()+tnd_output())*30;
}
}
static int dacRates[6]={
4000, 8000, 11025, 16000, 22050, 32000
};
static unsigned char noiseTable[256]={
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4,
15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4,
15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4,
3, 2, 1, 0, 11, 10, 9, 8, 7, 6, 5, 4,
15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4,
3, 2, 1, 0, 11, 10, 9, 8, 7, 6, 5, 4,
15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4,
3, 2, 1, 0, 11, 10, 9, 8, 7, 6, 5, 4,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15
};
void DivPlatformNES::tick() {
for (int i=0; i<4; i++) {
chan[i].std.next();
if (chan[i].std.hadVol) {
// ok, why are the volumes like that?
chan[i].outVol=chan[i].std.vol-(15-chan[i].vol);
if (chan[i].outVol<0) chan[i].outVol=0;
if (i==2) { // triangle
apu_wr_reg(0x4000+i*4,(chan[i].outVol==0)?0:255);
chan[i].freqChanged=true;
} else {
apu_wr_reg(0x4000+i*4,0x30|chan[i].outVol|((chan[i].duty&3)<<6));
}
}
if (chan[i].std.hadArp) {
if (i==3) { // noise
if (chan[i].std.arpMode) {
chan[i].baseFreq=chan[i].std.arp;
} else {
chan[i].baseFreq=chan[i].note+chan[i].std.arp-12;
}
if (chan[i].baseFreq>255) chan[i].baseFreq=255;
if (chan[i].baseFreq<0) chan[i].baseFreq=0;
} else {
if (!chan[i].inPorta) {
if (chan[i].std.arpMode) {
chan[i].baseFreq=round(FREQ_BASE/pow(2.0f,((float)(chan[i].std.arp)/12.0f)));
} else {
chan[i].baseFreq=round(FREQ_BASE/pow(2.0f,((float)(chan[i].note+chan[i].std.arp-12)/12.0f)));
}
}
}
chan[i].freqChanged=true;
} else {
if (chan[i].std.arpMode && chan[i].std.finishedArp) {
chan[i].baseFreq=round(FREQ_BASE/pow(2.0f,((float)(chan[i].note)/12.0f)));
chan[i].freqChanged=true;
}
}
if (chan[i].std.hadDuty) {
chan[i].duty=chan[i].std.duty;
if (i==3 && chan[i].duty>1) chan[i].duty=1;
DivInstrument* ins=parent->getIns(chan[i].ins);
if (i!=2) {
apu_wr_reg(0x4000+i*4,0x30|chan[i].outVol|((chan[i].duty&3)<<6));
}
if (i==3) { // noise
chan[i].freqChanged=true;
}
}
if (chan[i].sweepChanged) {
chan[i].sweepChanged=false;
if (i==0) {
//rWrite(16+i*5,chan[i].sweep);
}
}
if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
DivInstrument* ins=parent->getIns(chan[i].ins);
if (i==3) { // noise
chan[i].freq=noiseTable[chan[i].baseFreq];
} else {
chan[i].freq=(chan[i].baseFreq*(ONE_SEMITONE-chan[i].pitch))/ONE_SEMITONE;
if (chan[i].freq>2047) chan[i].freq=2047;
}
if (chan[i].keyOn) {
//rWrite(16+i*5+1,((chan[i].duty&3)<<6)|(63-(ins->gb.soundLen&63)));
//rWrite(16+i*5+2,((chan[i].vol<<4))|(ins->gb.envLen&7)|((ins->gb.envDir&1)<<3));
}
if (chan[i].keyOff) {
//rWrite(16+i*5+2,8);
if (i==2) { // triangle
apu_wr_reg(0x4000+i*4,0x00);
} else {
apu_wr_reg(0x4000+i*4,0x30);
}
}
if (i==3) { // noise
apu_wr_reg(0x4002+i*4,(chan[i].duty<<7)|chan[i].freq);
apu_wr_reg(0x4003+i*4,0xf0);
} else {
apu_wr_reg(0x4002+i*4,chan[i].freq&0xff);
if ((chan[i].prevFreq>>8)!=(chan[i].freq>>8) || i==2) {
apu_wr_reg(0x4003+i*4,0xf8|(chan[i].freq>>8));
}
chan[i].prevFreq=chan[i].freq;
}
if (chan[i].keyOn) chan[i].keyOn=false;
if (chan[i].keyOff) chan[i].keyOff=false;
chan[i].freqChanged=false;
}
}
}
int DivPlatformNES::dispatch(DivCommand c) {
switch (c.cmd) {
case DIV_CMD_NOTE_ON:
if (c.chan==4) { // PCM
dacSample=c.value%12;
if (dacSample>=parent->song.sampleLen) {
dacSample=-1;
break;
}
dacPos=0;
dacPeriod=0;
dacRate=dacRates[parent->song.sample[dacSample]->rate];
break;
} else if (c.chan==3) { // noise
chan[c.chan].baseFreq=c.value;
} else {
chan[c.chan].baseFreq=round(FREQ_BASE/pow(2.0f,((float)c.value/12.0f)));
}
chan[c.chan].freqChanged=true;
chan[c.chan].note=c.value;
chan[c.chan].active=true;
chan[c.chan].keyOn=true;
chan[c.chan].std.init(parent->getIns(chan[c.chan].ins));
if (c.chan==2) {
apu_wr_reg(0x4000+c.chan*4,0xff);
} else {
apu_wr_reg(0x4000+c.chan*4,0x30|chan[c.chan].vol|((chan[c.chan].duty&3)<<6));
}
break;
case DIV_CMD_NOTE_OFF:
chan[c.chan].active=false;
chan[c.chan].keyOff=true;
chan[c.chan].std.init(NULL);
break;
case DIV_CMD_INSTRUMENT:
if (chan[c.chan].ins!=c.value) {
chan[c.chan].ins=c.value;
}
break;
case DIV_CMD_VOLUME:
if (chan[c.chan].vol!=c.value) {
chan[c.chan].vol=c.value;
if (!chan[c.chan].std.hasVol) {
chan[c.chan].outVol=c.value;
}
if (c.chan==2) {
apu_wr_reg(0x4000+c.chan*4,0xff);
} else {
apu_wr_reg(0x4000+c.chan*4,0x30|chan[c.chan].vol|((chan[c.chan].duty&3)<<6));
}
}
break;
case DIV_CMD_GET_VOLUME:
return chan[c.chan].vol;
break;
case DIV_CMD_PITCH:
chan[c.chan].pitch=c.value;
chan[c.chan].freqChanged=true;
break;
case DIV_CMD_NOTE_PORTA: {
int destFreq=round(FREQ_BASE/pow(2.0f,((float)c.value2/12.0f)));
bool return2=false;
if (destFreq>chan[c.chan].baseFreq) {
chan[c.chan].baseFreq+=c.value;
if (chan[c.chan].baseFreq>=destFreq) {
chan[c.chan].baseFreq=destFreq;
return2=true;
}
} else {
chan[c.chan].baseFreq-=c.value;
if (chan[c.chan].baseFreq<=destFreq) {
chan[c.chan].baseFreq=destFreq;
return2=true;
}
}
chan[c.chan].freqChanged=true;
if (return2) {
chan[c.chan].inPorta=false;
return 2;
}
break;
}
case DIV_CMD_STD_NOISE_MODE:
chan[c.chan].duty=c.value;
if (c.chan==3) { // noise
chan[c.chan].freqChanged=true;
}
break;
case DIV_CMD_PANNING: {
lastPan&=~(0x11<<c.chan);
if (c.value==0) c.value=0x11;
lastPan|=c.value<<c.chan;
break;
}
case DIV_CMD_LEGATO:
if (c.chan==3) break;
chan[c.chan].baseFreq=round(FREQ_BASE/pow(2.0f,((float)(c.value+((!chan[c.chan].std.arpMode)?(chan[c.chan].std.arp-12):(0)))/12.0f)));
chan[c.chan].freqChanged=true;
chan[c.chan].note=c.value;
break;
case DIV_CMD_PRE_PORTA:
chan[c.chan].std.init(parent->getIns(chan[c.chan].ins));
chan[c.chan].inPorta=c.value;
break;
case DIV_CMD_GET_VOLMAX:
return 15;
break;
case DIV_ALWAYS_SET_VOLUME:
return 1;
break;
default:
break;
}
return 1;
}
bool DivPlatformNES::keyOffAffectsArp(int ch) {
return true;
}
int DivPlatformNES::init(DivEngine* p, int channels, int sugRate) {
parent=p;
rate=1789773;
dacPeriod=0;
dacPos=0;
dacRate=0;
dacSample=-1;
init_nla_table(500,500);
apu_turn_on();
apu.addrSpace=new unsigned char[65536];
apu.cpu_cycles=0;
apu.cpu_opcode_cycle=0;
apu_wr_reg(0x4015,0x1f);
apu_wr_reg(0x4001,0x08);
apu_wr_reg(0x4005,0x08);
/*apu_wr_reg(0x4000,0x3f);
apu_wr_reg(0x4001,0x00);
apu_wr_reg(0x4002,0xff);
apu_wr_reg(0x4003,0x10);
apu_wr_reg(0x4004,0x3f);
apu_wr_reg(0x4005,0x00);
apu_wr_reg(0x4006,0xfe);
apu_wr_reg(0x4007,0x10);*/
lastPan=0xff;
return 5;
}
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