mirror of
https://github.com/tildearrow/furnace.git
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530 lines
14 KiB
C++
530 lines
14 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 "lynx.h"
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#include "../engine.h"
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#include <math.h>
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#define rWrite(a,v) {if (!skipRegisterWrites) {mikey->write(a,v); if (dumpWrites) {addWrite(a,v);}}}
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#define WRITE_VOLUME(ch,v) rWrite(0x20+(ch<<3),(v))
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#define WRITE_FEEDBACK(ch,v) rWrite(0x21+(ch<<3),(v))
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#define WRITE_OUTPUT(ch,v) rWrite(0x22+(ch<<3),(v))
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#define WRITE_LFSR(ch,v) rWrite(0x23+(ch<<3),(v))
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#define WRITE_BACKUP(ch,v) rWrite(0x24+(ch<<3),(v))
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#define WRITE_CONTROL(ch,v) rWrite(0x25+(ch<<3),(v))
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#define WRITE_OTHER(ch,v) rWrite(0x27+(ch<<3),(v))
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#define WRITE_ATTEN(ch,v) rWrite((0x40+ch),(v))
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#define WRITE_STEREO(v) rWrite(0x50,(v))
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#define CHIP_DIVIDER 64
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#define CHIP_FREQBASE 16000000
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#if defined( _MSC_VER )
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#include <intrin.h>
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static int bsr(uint16_t v) {
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unsigned long idx;
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if (_BitScanReverse(&idx,(unsigned long)v)) {
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return idx;
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}
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else {
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return -1;
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}
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}
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#elif defined( __GNUC__ )
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static int bsr(uint16_t v)
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{
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if (v) {
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return 32 - __builtin_clz(v);
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}
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else{
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return -1;
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}
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}
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#else
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static int bsr(uint16_t v)
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{
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uint16_t mask = 0x8000;
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for (int i = 15; i >= 0; --i) {
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if (v&mask)
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return (int)i;
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mask>>=1;
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}
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return -1;
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}
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#endif
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static int32_t clamp(int32_t v, int32_t lo, int32_t hi)
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{
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return v<lo?lo:(v>hi?hi:v);
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}
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const char* regCheatSheetLynx[]={
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"AUDIO0_VOLCNTRL", "20",
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"AUDIO0_FEEDBACK", "21",
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"AUDIO0_OUTPUT", "22",
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"AUDIO0_SHIFT", "23",
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"AUDIO0_BACKUP", "24",
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"AUDIO0_CONTROL", "25",
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"AUDIO0_COUNTER", "26",
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"AUDIO0_OTHER", "27",
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"AUDIO1_VOLCNTRL", "28",
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"AUDIO1_FEEDBACK", "29",
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"AUDIO1_OUTPUT", "2a",
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"AUDIO1_SHIFT", "2b",
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"AUDIO1_BACKUP", "2c",
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"AUDIO1_CONTROL", "2d",
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"AUDIO1_COUNTER", "2e",
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"AUDIO1_OTHER", "2f",
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"AUDIO2_VOLCNTRL", "30",
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"AUDIO2_FEEDBACK", "31",
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"AUDIO2_OUTPUT", "32",
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"AUDIO2_SHIFT", "33",
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"AUDIO2_BACKUP", "34",
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"AUDIO2_CONTROL", "35",
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"AUDIO2_COUNTER", "36",
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"AUDIO2_OTHER", "37",
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"AUDIO3_VOLCNTRL", "38",
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"AUDIO3_FEEDBACK", "39",
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"AUDIO3_OUTPUT", "3a",
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"AUDIO3_SHIFT", "3b",
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"AUDIO3_BACKUP", "3c",
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"AUDIO3_CONTROL", "3d",
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"AUDIO3_COUNTER", "3e",
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"AUDIO3_OTHER", "3f",
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"ATTENREG0", "40",
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"ATTENREG1", "41",
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"ATTENREG2", "42",
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"ATTENREG3", "43",
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"MPAN", "44",
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"MSTEREO", "50",
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NULL
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};
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const char** DivPlatformLynx::getRegisterSheet() {
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return regCheatSheetLynx;
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}
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void DivPlatformLynx::acquire(short* bufL, short* bufR, size_t start, size_t len) {
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for (size_t h=start; h<start+len; h++) {
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for (int i=0; i<4; i++) {
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if (chan[i].pcm && chan[i].sample>=0 && chan[i].sample<parent->song.sampleLen) {
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chan[i].sampleAccum-=chan[i].sampleFreq;
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if (chan[i].sampleAccum<0) {
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chan[i].sampleAccum+=rate;
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DivSample* s=parent->getSample(chan[i].sample);
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if (s!=NULL) {
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if (isMuted[i]) {
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WRITE_OUTPUT(i,0);
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} else {
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WRITE_OUTPUT(i,CLAMP((s->data8[chan[i].samplePos]*chan[i].outVol)>>7,-128,127));
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}
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chan[i].samplePos++;
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if (s->isLoopable() && chan[i].samplePos>=s->loopEnd) {
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chan[i].samplePos=s->loopStart;
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} else if (chan[i].samplePos>=(int)s->samples) {
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chan[i].sample=-1;
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}
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}
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}
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}
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}
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mikey->sampleAudio( bufL + h, bufR + h, 1, oscBuf );
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}
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}
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void DivPlatformLynx::tick(bool sysTick) {
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for (int i=0; i<4; i++) {
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chan[i].std.next();
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if (chan[i].std.vol.had) {
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if (chan[i].pcm) {
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chan[i].outVol=((chan[i].vol&127)*MIN(chan[i].macroVolMul,chan[i].std.vol.val))/chan[i].macroVolMul;
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} else {
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chan[i].outVol=((chan[i].vol&127)*MIN(127,chan[i].std.vol.val))>>7;
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}
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WRITE_VOLUME(i,(isMuted[i]?0:(chan[i].outVol&127)));
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}
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if (chan[i].std.arp.had) {
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if (!chan[i].inPorta) {
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chan[i].actualNote=parent->calcArp(chan[i].note,chan[i].std.arp.val);
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chan[i].baseFreq=NOTE_PERIODIC(chan[i].actualNote);
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if (chan[i].pcm) chan[i].sampleBaseFreq=NOTE_FREQUENCY(chan[i].actualNote);
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chan[i].freqChanged=true;
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}
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}
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if (chan[i].std.panL.had) {
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chan[i].pan&=0x0f;
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chan[i].pan|=(chan[i].std.panL.val&15)<<4;
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}
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if (chan[i].std.panR.had) {
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chan[i].pan&=0xf0;
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chan[i].pan|=chan[i].std.panR.val&15;
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}
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if (chan[i].std.panL.had || chan[i].std.panR.had) {
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WRITE_ATTEN(i,chan[i].pan);
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}
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if (chan[i].std.pitch.had) {
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if (chan[i].std.pitch.mode) {
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chan[i].pitch2+=chan[i].std.pitch.val;
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CLAMP_VAR(chan[i].pitch2,-32768,32767);
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} else {
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chan[i].pitch2=chan[i].std.pitch.val;
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}
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chan[i].freqChanged=true;
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}
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if (chan[i].std.phaseReset.had) {
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if (chan[i].std.phaseReset.val==1) {
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if (chan[i].pcm && chan[i].sample>=0 && chan[i].sample<parent->song.sampleLen) {
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chan[i].sampleAccum=0;
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chan[i].samplePos=0;
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}
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WRITE_LFSR(i, 0);
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WRITE_OTHER(i, 0);
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}
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}
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if (chan[i].freqChanged) {
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if (chan[i].pcm) {
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double off=1.0;
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if (chan[i].sample>=0 && chan[i].sample<parent->song.sampleLen) {
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DivSample* s=parent->getSample(chan[i].sample);
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if (s->centerRate<1) {
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off=1.0;
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} else {
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off=(double)s->centerRate/8363.0;
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}
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}
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chan[i].sampleFreq=off*parent->calcFreq(chan[i].sampleBaseFreq,chan[i].pitch,false,2,chan[i].pitch2,chipClock,CHIP_FREQBASE);
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} else {
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if (chan[i].lfsr >= 0) {
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WRITE_LFSR(i, (chan[i].lfsr&0xff));
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WRITE_OTHER(i, ((chan[i].lfsr&0xf00)>>4));
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chan[i].lfsr=-1;
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}
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chan[i].fd=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2,chipClock,CHIP_DIVIDER);
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if (chan[i].std.duty.had) {
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chan[i].duty=chan[i].std.duty.val;
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WRITE_FEEDBACK(i, chan[i].duty.feedback);
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}
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WRITE_CONTROL(i, (chan[i].fd.clockDivider|0x18|chan[i].duty.int_feedback7));
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WRITE_BACKUP( i, chan[i].fd.backup );
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}
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chan[i].freqChanged=false;
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} else if (chan[i].std.duty.had) {
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chan[i].duty = chan[i].std.duty.val;
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if (!chan[i].pcm) {
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WRITE_FEEDBACK(i, chan[i].duty.feedback);
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WRITE_CONTROL(i, (chan[i].fd.clockDivider|0x18|chan[i].duty.int_feedback7));
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}
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}
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}
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}
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int DivPlatformLynx::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,DIV_INS_MIKEY);
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chan[c.chan].macroVolMul=ins->type==DIV_INS_AMIGA?64:127;
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chan[c.chan].pcm=(ins->type==DIV_INS_AMIGA || ins->amiga.useSample);
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if (c.value!=DIV_NOTE_NULL) {
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chan[c.chan].baseFreq=NOTE_PERIODIC(c.value);
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if (chan[c.chan].pcm) {
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chan[c.chan].sampleBaseFreq=NOTE_FREQUENCY(c.value);
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chan[c.chan].sample=ins->amiga.getSample(c.value);
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chan[c.chan].sampleAccum=0;
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chan[c.chan].samplePos=0;
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}
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chan[c.chan].freqChanged=true;
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chan[c.chan].note=c.value;
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chan[c.chan].actualNote=c.value;
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if (chan[c.chan].lfsr<0)
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chan[c.chan].lfsr=0;
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}
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chan[c.chan].active=true;
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WRITE_VOLUME(c.chan,(isMuted[c.chan]?0:(chan[c.chan].vol&127)));
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chan[c.chan].macroInit(ins);
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if (!parent->song.brokenOutVol && !chan[c.chan].std.vol.will) {
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chan[c.chan].outVol=chan[c.chan].vol;
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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].active=false;
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WRITE_VOLUME(c.chan,0);
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WRITE_CONTROL(c.chan,0);
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chan[c.chan].macroInit(NULL);
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if (chan[c.chan].pcm) {
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chan[c.chan].pcm=false;
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}
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break;
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case DIV_CMD_LYNX_LFSR_LOAD:
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chan[c.chan].freqChanged=true;
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chan[c.chan].lfsr=c.value;
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break;
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case DIV_CMD_NOTE_OFF_ENV:
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case DIV_CMD_ENV_RELEASE:
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chan[c.chan].std.release();
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break;
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case DIV_CMD_INSTRUMENT:
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chan[c.chan].ins=c.value;
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//chan[c.chan].macroInit(parent->getIns(chan[c.chan].ins,DIV_INS_MIKEY));
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break;
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case DIV_CMD_VOLUME:
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if (chan[c.chan].vol!=c.value) {
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chan[c.chan].vol=c.value;
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if (!chan[c.chan].std.vol.has) {
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chan[c.chan].outVol=c.value;
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}
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if (chan[c.chan].active && !chan[c.chan].pcm) WRITE_VOLUME(c.chan,(isMuted[c.chan]?0:(chan[c.chan].vol&127)));
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}
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break;
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case DIV_CMD_PANNING:
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chan[c.chan].pan=(c.value&0xf0)|(c.value2>>4);
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WRITE_ATTEN(c.chan,chan[c.chan].pan);
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break;
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case DIV_CMD_GET_VOLUME:
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if (chan[c.chan].std.vol.has) {
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return chan[c.chan].vol;
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}
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return chan[c.chan].outVol;
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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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case DIV_CMD_NOTE_PORTA: {
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int destFreq=NOTE_PERIODIC(c.value2);
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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 (chan[c.chan].pcm && parent->song.linearPitch==2) {
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chan[c.chan].sampleBaseFreq=chan[c.chan].baseFreq;
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}
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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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int whatAMess=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].baseFreq=NOTE_PERIODIC(whatAMess);
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if (chan[c.chan].pcm) {
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chan[c.chan].sampleBaseFreq=NOTE_FREQUENCY(whatAMess);
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}
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chan[c.chan].freqChanged=true;
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chan[c.chan].note=c.value;
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chan[c.chan].actualNote=c.value;
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break;
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}
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case DIV_CMD_PRE_PORTA:
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if (chan[c.chan].active && c.value2) {
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if (parent->song.resetMacroOnPorta) chan[c.chan].macroInit(parent->getIns(chan[c.chan].ins,DIV_INS_MIKEY));
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}
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if (!chan[c.chan].inPorta && c.value && !parent->song.brokenPortaArp && chan[c.chan].std.arp.will) chan[c.chan].baseFreq=NOTE_PERIODIC(chan[c.chan].note);
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chan[c.chan].inPorta=c.value;
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break;
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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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default:
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break;
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}
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return 1;
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}
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void DivPlatformLynx::muteChannel(int ch, bool mute) {
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isMuted[ch]=mute;
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if (chan[ch].active) WRITE_VOLUME(ch,(isMuted[ch]?0:(chan[ch].outVol&127)));
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}
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bool DivPlatformLynx::isStereo() {
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return true;
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}
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void DivPlatformLynx::forceIns() {
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for (int i=0; i<4; i++) {
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if (chan[i].active) {
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chan[i].insChanged=true;
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chan[i].freqChanged=true;
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}
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WRITE_ATTEN(i,chan[i].pan);
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}
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}
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void* DivPlatformLynx::getChanState(int ch) {
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return &chan[ch];
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}
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DivMacroInt* DivPlatformLynx::getChanMacroInt(int ch) {
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return &chan[ch].std;
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}
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DivDispatchOscBuffer* DivPlatformLynx::getOscBuffer(int ch) {
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return oscBuf[ch];
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}
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unsigned char* DivPlatformLynx::getRegisterPool()
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{
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return const_cast<unsigned char*>( mikey->getRegisterPool() );
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}
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int DivPlatformLynx::getRegisterPoolSize()
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{
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return 4*8+4;
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}
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void DivPlatformLynx::reset() {
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mikey=std::make_unique<Lynx::Mikey>(rate);
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for (int i=0; i<4; i++) {
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chan[i]=DivPlatformLynx::Channel();
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chan[i].std.setEngine(parent);
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}
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if (dumpWrites) {
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addWrite(0xffffffff,0);
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}
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WRITE_STEREO(0);
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}
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bool DivPlatformLynx::keyOffAffectsArp(int ch) {
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return true;
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}
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bool DivPlatformLynx::keyOffAffectsPorta(int ch) {
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return true;
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}
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//int DivPlatformLynx::getPortaFloor(int ch) {
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// return 12;
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//}
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void DivPlatformLynx::notifyInsDeletion(void* ins) {
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for (int i=0; i<4; i++) {
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chan[i].std.notifyInsDeletion((DivInstrument*)ins);
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}
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}
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void DivPlatformLynx::poke(unsigned int addr, unsigned short val) {
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rWrite(addr,val);
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}
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void DivPlatformLynx::poke(std::vector<DivRegWrite>& wlist) {
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for (DivRegWrite& i: wlist) rWrite(i.addr, i.val);
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}
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int DivPlatformLynx::init(DivEngine* p, int channels, int sugRate, const DivConfig& flags) {
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parent=p;
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dumpWrites=false;
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skipRegisterWrites=false;
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|
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for (int i=0; i<4; i++) {
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isMuted[i]=false;
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oscBuf[i]=new DivDispatchOscBuffer;
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}
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|
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chipClock = 16000000;
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rate = chipClock/128;
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|
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for (int i=0; i<4; i++) {
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oscBuf[i]->rate=rate;
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}
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|
|
|
reset();
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|
return 4;
|
|
}
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|
|
|
void DivPlatformLynx::quit() {
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|
for (int i=0; i<4; i++) {
|
|
delete oscBuf[i];
|
|
}
|
|
mikey.reset();
|
|
}
|
|
|
|
DivPlatformLynx::~DivPlatformLynx() {
|
|
}
|
|
|
|
DivPlatformLynx::MikeyFreqDiv::MikeyFreqDiv(int frequency) {
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|
|
|
int clamped=clamp(frequency, 36, 16383);
|
|
|
|
auto top=bsr(clamped);
|
|
|
|
if (top>7)
|
|
{
|
|
clockDivider=top-7;
|
|
backup=frequency>>(top-7);
|
|
}
|
|
else
|
|
{
|
|
clockDivider=0;
|
|
backup=frequency;
|
|
}
|
|
}
|
|
|
|
DivPlatformLynx::MikeyDuty::MikeyDuty(int duty) {
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|
|
|
//duty:
|
|
//9: int
|
|
//8: f11
|
|
//7: f10
|
|
//6: f7
|
|
//5: f5
|
|
//4: f4
|
|
//3: f3
|
|
//2: f2
|
|
//1: f1
|
|
//0: f0
|
|
|
|
//f7 moved to bit 7 and int moved to bit 5
|
|
int_feedback7=((duty&0x40)<<1)|((duty&0x200)>>4);
|
|
//f11 and f10 moved to bits 7 & 6
|
|
feedback=(duty&0x3f)|((duty&0x180)>>1);
|
|
}
|