furnace/src/engine/platform/snes.cpp

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/**
* Furnace Tracker - multi-system chiptune tracker
* Copyright (C) 2021-2022 tildearrow and contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "snes.h"
#include "../engine.h"
#include "../../ta-log.h"
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#include <math.h>
#define CHIP_FREQBASE 131072
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#define rWrite(a,v) {dsp.write(a,v); regPool[(a)&0x7f]=v; }
#define chWrite(c,a,v) {rWrite((a)+(c)*16,v)}
#define sampleTableAddr(c) (sampleTableBase+(c)*4)
#define waveTableAddr(c) (sampleTableBase+8*4+(c)*9*16)
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const char* regCheatSheetSNESDSP[]={
"VxVOLL", "x0",
"VxVOLR", "x1",
"VxPITCHL", "x2",
"VxPITCHH", "x3",
"VxSRCN", "x4",
"VxADSR1", "x5",
"VxADSR2", "x6",
"VxGAIN", "x7",
"VxENVX", "x8",
"VxOUTX", "x9",
"FIRx", "xF",
"MVOLL", "0C",
"MVOLR", "1C",
"EVOLL", "2C",
"EVOLR", "3C",
"KON", "4C",
"KOFF", "5C",
"FLG", "6C",
"ENDX", "7C",
"EFB", "0D",
"PMON", "2D",
"NON", "3D",
"EON", "4D",
"DIR", "5D",
"ESA", "6D",
"EDL", "7D",
NULL
};
const char** DivPlatformSNES::getRegisterSheet() {
return regCheatSheetSNESDSP;
}
void DivPlatformSNES::acquire(short* bufL, short* bufR, size_t start, size_t len) {
short out[2];
short chOut[16];
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for (size_t h=start; h<start+len; h++) {
dsp.set_output(out,1);
dsp.run(32);
dsp.get_voice_outputs(chOut);
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bufL[h]=out[0];
bufR[h]=out[1];
for (int i=0; i<8; i++) {
oscBuf[i]->data[oscBuf[i]->needle++]=chOut[i*2]+chOut[i*2+1];
}
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}
}
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void DivPlatformSNES::tick(bool sysTick) {
// KON/KOFF can't be written several times per one sample
// so they have to be accumulated
unsigned char kon=0;
unsigned char koff=0;
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for (int i=0; i<8; i++) {
DivInstrument* ins=parent->getIns(chan[i].ins,DIV_INS_AMIGA);
bool hadGain=chan[i].std.vol.had || chan[i].std.ex1.had || chan[i].std.ex2.had;
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chan[i].std.next();
if (ins->type==DIV_INS_AMIGA && chan[i].std.vol.had) {
chWrite(i,7,MIN(127,chan[i].std.vol.val*2));
} else if (!chan[i].useEnv && hadGain) {
if (chan[i].std.ex1.val==0) {
// direct gain
chWrite(i,7,chan[i].std.vol.val);
} else {
// inc/dec
chWrite(i,7,chan[i].std.ex2.val|((chan[i].std.ex1.val-1)<<5)|0x80);
}
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}
if (chan[i].std.arp.had) {
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if (!chan[i].inPorta) {
if (chan[i].std.arp.mode) {
chan[i].baseFreq=NOTE_FREQUENCY(chan[i].std.arp.val);
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} else {
chan[i].baseFreq=NOTE_FREQUENCY(chan[i].note+chan[i].std.arp.val);
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}
}
chan[i].freqChanged=true;
} else {
if (chan[i].std.arp.mode && chan[i].std.arp.finished) {
chan[i].baseFreq=NOTE_FREQUENCY(chan[i].note);
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chan[i].freqChanged=true;
}
}
if (chan[i].useWave && chan[i].std.wave.had) {
if (chan[i].wave!=chan[i].std.wave.val || chan[i].ws.activeChanged()) {
chan[i].wave=chan[i].std.wave.val;
chan[i].ws.changeWave1(chan[i].wave);
}
}
if (chan[i].std.pitch.had) {
if (chan[i].std.pitch.mode) {
chan[i].pitch2+=chan[i].std.pitch.val;
CLAMP_VAR(chan[i].pitch2,-32768,32767);
} else {
chan[i].pitch2=chan[i].std.pitch.val;
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}
chan[i].freqChanged=true;
}
if (chan[i].std.panL.had) {
int val=chan[i].std.panL.val&0x7f;
chan[i].panL=(val<<1)|(val>>6);
}
if (chan[i].std.panR.had) {
int val=chan[i].std.panR.val&0x7f;
chan[i].panR=(val<<1)|(val>>6);
}
if (chan[i].std.panL.had || chan[i].std.panR.had) {
writeOutVol(i);
}
if (chan[i].setPos) {
// force keyon
chan[i].keyOn=true;
chan[i].setPos=false;
} else {
chan[i].audPos=0;
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}
if (chan[i].useWave && chan[i].active) {
if (chan[i].ws.tick()) {
updateWave(i);
}
}
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if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
DivSample* s=parent->getSample(chan[i].sample);
double off=(s->centerRate>=1)?((double)s->centerRate/8363.0):1.0;
chan[i].freq=(unsigned int)(off*parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,2,chan[i].pitch2,chipClock,CHIP_FREQBASE));
if (chan[i].freq>16383) chan[i].freq=16383;
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if (chan[i].keyOn) {
unsigned int start, end, loop;
size_t tabAddr=sampleTableAddr(i);
if (chan[i].useEnv) {
chWrite(i,5,ins->snes.a|(ins->snes.d<<4)|0x80);
chWrite(i,6,ins->snes.r|(ins->snes.s<<5));
} else {
chWrite(i,5,0);
}
if (chan[i].useWave) {
start=waveTableAddr(i);
loop=start;
} else {
start=s->offSNES;
end=MIN(start+MAX(s->lengthBRR,1),getSampleMemCapacity());
loop=MAX(start,end-1);
if (chan[i].audPos>0) {
start=start+MIN(chan[i].audPos,s->lengthBRR-1)/16*9;
}
if (s->loopStart>=0) {
loop=start+s->loopStart/16*9;
}
}
sampleMem[tabAddr+0]=start&0xff;
sampleMem[tabAddr+1]=start>>8;
sampleMem[tabAddr+2]=loop&0xff;
sampleMem[tabAddr+3]=loop>>8;
if (!hadGain) {
chWrite(i,7,0x7f);
}
kon|=(1<<i);
chan[i].keyOn=false;
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}
if (chan[i].keyOff) {
koff|=(1<<i);
chan[i].keyOff=false;
}
if (chan[i].freqChanged) {
chWrite(i,2,chan[i].freq&0xff);
chWrite(i,3,chan[i].freq>>8);
chan[i].freqChanged=false;
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}
}
}
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if (kon!=0) {
rWrite(0x4c,kon);
}
// always write KOFF as it's constantly polled
rWrite(0x5c,koff);
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}
int DivPlatformSNES::dispatch(DivCommand c) {
switch (c.cmd) {
case DIV_CMD_NOTE_ON: {
DivInstrument* ins=parent->getIns(chan[c.chan].ins,DIV_INS_AMIGA);
if (ins->amiga.useWave) {
chan[c.chan].useWave=true;
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chan[c.chan].wtLen=ins->amiga.waveLen+1;
if (chan[c.chan].insChanged) {
if (chan[c.chan].wave<0) {
chan[c.chan].wave=0;
chan[c.chan].ws.setWidth(chan[c.chan].wtLen);
chan[c.chan].ws.changeWave1(chan[c.chan].wave);
}
}
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chan[c.chan].ws.init(ins,chan[c.chan].wtLen,15,chan[c.chan].insChanged);
} else {
chan[c.chan].sample=ins->amiga.getSample(c.value);
chan[c.chan].useWave=false;
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}
if (chan[c.chan].useWave || chan[c.chan].sample<0 || chan[c.chan].sample>=parent->song.sampleLen) {
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chan[c.chan].sample=-1;
}
if (c.value!=DIV_NOTE_NULL) {
chan[c.chan].baseFreq=round(NOTE_FREQUENCY(c.value));
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chan[c.chan].freqChanged=true;
chan[c.chan].note=c.value;
}
chan[c.chan].active=true;
chan[c.chan].keyOn=true;
chan[c.chan].macroInit(ins);
if (ins->type==DIV_INS_SNES) {
// initialize to max gain in case of direct gain mode macro without gain level macro
chan[c.chan].std.vol.val=0x7f;
chan[c.chan].useEnv=ins->snes.useEnv;
}
chan[c.chan].insChanged=false;
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break;
}
case DIV_CMD_NOTE_OFF:
chan[c.chan].sample=-1;
chan[c.chan].active=false;
chan[c.chan].keyOff=true;
chan[c.chan].macroInit(NULL);
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break;
case DIV_CMD_NOTE_OFF_ENV:
case DIV_CMD_ENV_RELEASE:
chan[c.chan].std.release();
break;
case DIV_CMD_INSTRUMENT:
if (chan[c.chan].ins!=c.value || c.value2==1) {
chan[c.chan].ins=c.value;
chan[c.chan].insChanged=true;
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}
break;
case DIV_CMD_VOLUME:
if (chan[c.chan].vol!=c.value) {
chan[c.chan].vol=c.value;
writeOutVol(c.chan);
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}
break;
// case DIV_CMD_GLOBAL_VOLUME:
// gblVolL=MIN(c.value,127);
// gblVolR=MIN(c.value,127);
// rWrite(0x0c,gblVolL);
// rWrite(0x1c,gblVolR);
// break;
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case DIV_CMD_GET_VOLUME:
return chan[c.chan].vol;
break;
case DIV_CMD_PANNING:
chan[c.chan].panL=c.value;
chan[c.chan].panR=c.value2;
writeOutVol(c.chan);
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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(NOTE_FREQUENCY(c.value2));
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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_LEGATO: {
chan[c.chan].baseFreq=round(NOTE_FREQUENCY(c.value+((chan[c.chan].std.arp.will && !chan[c.chan].std.arp.mode)?(chan[c.chan].std.arp.val):(0))));
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chan[c.chan].freqChanged=true;
chan[c.chan].note=c.value;
break;
}
case DIV_CMD_PRE_PORTA:
if (chan[c.chan].active && c.value2) {
if (parent->song.resetMacroOnPorta) chan[c.chan].macroInit(parent->getIns(chan[c.chan].ins,DIV_INS_AMIGA));
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}
chan[c.chan].inPorta=c.value;
break;
case DIV_CMD_SAMPLE_POS:
chan[c.chan].audPos=c.value;
chan[c.chan].setPos=true;
break;
// TODO SNES-specific commands
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case DIV_CMD_GET_VOLMAX:
return 127;
break;
default:
break;
}
return 1;
}
void DivPlatformSNES::updateWave(int ch) {
// Due to the overflow bug in hardware's resampler, the written amplitude here is half of maximum
size_t pos=waveTableAddr(ch);
for (int i=0; i<chan[ch].wtLen/16; i++) {
sampleMem[pos++]=0xb0;
for (int j=0; j<8; j++) {
int nibble1=(chan[ch].ws.output[i*16+j*2]-8)&15;
int nibble2=(chan[ch].ws.output[i*16+j*2+1]-8)&15;
sampleMem[pos++]=(nibble1<<4)|nibble2;
}
}
sampleMem[pos-9]=0xb3; // mark loop
}
void DivPlatformSNES::writeOutVol(int ch) {
// TODO negative (inverted) panning support
int outL=0;
int outR=0;
if (!isMuted[ch]) {
outL=chan[ch].vol*chan[ch].panL/255;
outR=chan[ch].vol*chan[ch].panR/255;
}
chWrite(ch,0,outL);
chWrite(ch,1,outR);
}
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void DivPlatformSNES::muteChannel(int ch, bool mute) {
isMuted[ch]=mute;
writeOutVol(ch);
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}
void DivPlatformSNES::forceIns() {
for (int i=0; i<8; i++) {
chan[i].insChanged=true;
chan[i].freqChanged=true;
chan[i].sample=-1;
updateWave(i);
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}
}
void* DivPlatformSNES::getChanState(int ch) {
return &chan[ch];
}
DivMacroInt* DivPlatformSNES::getChanMacroInt(int ch) {
return &chan[ch].std;
}
DivDispatchOscBuffer* DivPlatformSNES::getOscBuffer(int ch) {
return oscBuf[ch];
}
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unsigned char* DivPlatformSNES::getRegisterPool() {
// get states from emulator
for (int i=0; i<0x80; i+=0x10) {
regPool[i+8]=dsp.read(i+8);
regPool[i+9]=dsp.read(i+9);
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}
regPool[0x7c]=dsp.read(0x7c); // ENDX
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return regPool;
}
int DivPlatformSNES::getRegisterPoolSize() {
return 128;
}
void DivPlatformSNES::reset() {
dsp.init(sampleMem);
dsp.set_output(NULL,0);
memset(regPool,0,128);
// TODO more initial values
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sampleTableBase=0x100; // hack: this can't be 0 or channel 1 won't play??
rWrite(0x5d,sampleTableBase>>8);
rWrite(0x0c,127); // global volume left
rWrite(0x1c,127); // global volume right
rWrite(0x6c,0); // get DSP out of reset
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for (int i=0; i<8; i++) {
chan[i]=Channel();
chan[i].std.setEngine(parent);
chan[i].ws.setEngine(parent);
chan[i].ws.init(NULL,32,255);
writeOutVol(i);
chWrite(i,4,i); // source number
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}
}
bool DivPlatformSNES::isStereo() {
return true;
}
void DivPlatformSNES::notifyInsChange(int ins) {
for (int i=0; i<8; i++) {
if (chan[i].ins==ins) {
chan[i].insChanged=true;
}
}
}
void DivPlatformSNES::notifyWaveChange(int wave) {
for (int i=0; i<8; i++) {
if (chan[i].useWave && chan[i].wave==wave) {
chan[i].ws.changeWave1(wave);
if (chan[i].active) {
updateWave(i);
}
}
}
}
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void DivPlatformSNES::notifyInsDeletion(void* ins) {
for (int i=0; i<8; i++) {
chan[i].std.notifyInsDeletion((DivInstrument*)ins);
}
}
void DivPlatformSNES::poke(unsigned int addr, unsigned short val) {
rWrite(addr,val);
}
void DivPlatformSNES::poke(std::vector<DivRegWrite>& wlist) {
for (DivRegWrite& i: wlist) rWrite(i.addr,i.val);
}
const void* DivPlatformSNES::getSampleMem(int index) {
return index == 0 ? sampleMem : NULL;
}
size_t DivPlatformSNES::getSampleMemCapacity(int index) {
// TODO change it based on current echo buffer size
return index == 0 ? 65536 : 0;
}
size_t DivPlatformSNES::getSampleMemUsage(int index) {
return index == 0 ? sampleMemLen : 0;
}
void DivPlatformSNES::renderSamples() {
memset(sampleMem,0,getSampleMemCapacity());
// skip past sample table and wavetable buffer
size_t memPos=sampleTableBase+8*4+8*9*16;
for (int i=0; i<parent->song.sampleLen; i++) {
DivSample* s=parent->song.sample[i];
int length=s->lengthBRR;
int actualLength=MIN((int)(getSampleMemCapacity()-memPos)/9*9,length);
if (actualLength>0) {
s->offSNES=memPos;
memcpy(&sampleMem[memPos],s->data8,actualLength);
memPos+=actualLength;
}
if (actualLength<length) {
// terminate the sample
sampleMem[memPos-9]=1;
logW("out of BRR memory for sample %d!",i);
break;
}
}
sampleMemLen=memPos;
}
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int DivPlatformSNES::init(DivEngine* p, int channels, int sugRate, unsigned int flags) {
parent=p;
dumpWrites=false;
skipRegisterWrites=false;
for (int i=0; i<8; i++) {
oscBuf[i]=new DivDispatchOscBuffer;
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isMuted[i]=false;
}
sampleMemLen=0;
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chipClock=1024000;
rate=chipClock/32;
reset();
return 8;
}
void DivPlatformSNES::quit() {
for (int i=0; i<8; i++) {
delete oscBuf[i];
}
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}