366 lines
9.6 KiB
C++
366 lines
9.6 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 "amiga.h"
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#include "../engine.h"
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#include <math.h>
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#define AMIGA_DIVIDER 8
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#define CHIP_DIVIDER 16
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const char* regCheatSheetAmiga[]={
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"DMACON", "96",
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"INTENA", "9A",
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"ADKCON", "9E",
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"AUD0LCH", "A0",
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"AUD0LCL", "A2",
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"AUD0LEN", "A4",
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"AUD0PER", "A6",
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"AUD0VOL", "A8",
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"AUD0DAT", "AA",
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"AUD1LCH", "B0",
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"AUD1LCL", "B2",
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"AUD1LEN", "B4",
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"AUD1PER", "B6",
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"AUD1VOL", "B8",
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"AUD1DAT", "BA",
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"AUD2LCH", "C0",
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"AUD2LCL", "C2",
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"AUD2LEN", "C4",
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"AUD2PER", "C6",
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"AUD2VOL", "C8",
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"AUD2DAT", "CA",
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"AUD3LCH", "D0",
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"AUD3LCL", "D2",
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"AUD3LEN", "D4",
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"AUD3PER", "D6",
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"AUD3VOL", "D8",
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"AUD3DAT", "DA",
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NULL
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};
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const char** DivPlatformAmiga::getRegisterSheet() {
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return regCheatSheetAmiga;
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}
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void DivPlatformAmiga::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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bufL[h]=0;
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bufR[h]=0;
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for (int i=0; i<4; i++) {
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if (chan[i].sample>=0 && chan[i].sample<parent->song.sampleLen) {
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chan[i].audSub-=AMIGA_DIVIDER;
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if (chan[i].audSub<0) {
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DivSample* s=parent->song.sample[chan[i].sample];
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if (s->samples>0) {
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chan[i].audDat=s->data8[chan[i].audPos++];
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if (chan[i].audPos>=s->samples || chan[i].audPos>=131071) {
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if (s->loopStart>=0 && s->loopStart<=(int)s->samples) {
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chan[i].audPos=s->loopStart;
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} else {
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chan[i].sample=-1;
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}
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}
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} else {
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chan[i].sample=-1;
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}
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if (chan[i].freq<124) {
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if (++chan[i].busClock>=512) {
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unsigned int rAmount=(124-chan[i].freq)*2;
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if (chan[i].audPos>=rAmount) {
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chan[i].audPos-=rAmount;
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}
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chan[i].busClock=0;
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}
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}
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chan[i].audSub+=MAX(114,chan[i].freq);
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}
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}
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if (!isMuted[i]) {
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if (i==0 || i==3) {
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bufL[h]+=((chan[i].audDat*chan[i].outVol)*sep1)>>7;
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bufR[h]+=((chan[i].audDat*chan[i].outVol)*sep2)>>7;
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} else {
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bufL[h]+=((chan[i].audDat*chan[i].outVol)*sep2)>>7;
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bufR[h]+=((chan[i].audDat*chan[i].outVol)*sep1)>>7;
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}
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}
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}
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}
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}
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void DivPlatformAmiga::tick() {
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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.hadVol) {
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chan[i].outVol=((chan[i].vol%65)*MIN(64,chan[i].std.vol))>>6;
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}
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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->song.sample[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=8363.0/(double)s->centerRate;
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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=off*NOTE_PERIODIC(chan[i].std.arp);
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} else {
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chan[i].baseFreq=off*NOTE_PERIODIC(chan[i].note+chan[i].std.arp);
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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=off*NOTE_PERIODIC(chan[i].note);
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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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if (chan[i].wave!=chan[i].std.wave) {
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chan[i].wave=chan[i].std.wave;
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if (!chan[i].keyOff) chan[i].keyOn=true;
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}
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}
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if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
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//DivInstrument* ins=parent->getIns(chan[i].ins);
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chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true);
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if (chan[i].freq>4095) chan[i].freq=4095;
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if (chan[i].note>0x5d) chan[i].freq=0x01;
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if (chan[i].keyOn) {
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if (chan[i].wave<0) {
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chan[i].wave=0;
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}
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}
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if (chan[i].keyOff) {
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}
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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 DivPlatformAmiga::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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chan[c.chan].sample=ins->amiga.initSample;
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double off=1.0;
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if (chan[c.chan].sample>=0 && chan[c.chan].sample<parent->song.sampleLen) {
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DivSample* s=parent->song.sample[chan[c.chan].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=8363.0/(double)s->centerRate;
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}
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}
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if (c.value!=DIV_NOTE_NULL) {
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chan[c.chan].baseFreq=off*NOTE_PERIODIC(c.value);
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}
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if (chan[c.chan].sample<0 || chan[c.chan].sample>=parent->song.sampleLen) {
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chan[c.chan].sample=-1;
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}
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chan[c.chan].audPos=0;
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chan[c.chan].audSub=0;
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if (c.value!=DIV_NOTE_NULL) {
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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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chan[c.chan].std.init(ins);
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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].sample=-1;
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chan[c.chan].active=false;
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chan[c.chan].keyOff=true;
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chan[c.chan].std.init(NULL);
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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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if (chan[c.chan].ins!=c.value || c.value2==1) {
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chan[c.chan].ins=c.value;
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}
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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.hasVol) {
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chan[c.chan].outVol=c.value;
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}
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}
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break;
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case DIV_CMD_GET_VOLUME:
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if (chan[c.chan].std.hasVol) {
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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_WAVE:
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chan[c.chan].wave=c.value;
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chan[c.chan].keyOn=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 (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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double off=1.0;
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if (chan[c.chan].sample>=0 && chan[c.chan].sample<parent->song.sampleLen) {
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DivSample* s=parent->song.sample[chan[c.chan].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=8363.0/(double)s->centerRate;
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}
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}
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chan[c.chan].baseFreq=off*NOTE_PERIODIC(c.value+((chan[c.chan].std.willArp && !chan[c.chan].std.arpMode)?(chan[c.chan].std.arp-12):(0)));
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chan[c.chan].freqChanged=true;
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chan[c.chan].note=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].std.init(parent->getIns(chan[c.chan].ins));
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}
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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 64;
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break;
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case DIV_ALWAYS_SET_VOLUME:
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return 1;
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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 DivPlatformAmiga::muteChannel(int ch, bool mute) {
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isMuted[ch]=mute;
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}
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void DivPlatformAmiga::forceIns() {
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for (int i=0; i<4; i++) {
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chan[i].insChanged=true;
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chan[i].freqChanged=true;
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chan[i].audPos=131072;
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chan[i].audDat=0;
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chan[i].sample=-1;
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}
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}
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void* DivPlatformAmiga::getChanState(int ch) {
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return &chan[ch];
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}
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void DivPlatformAmiga::reset() {
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for (int i=0; i<4; i++) {
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chan[i]=DivPlatformAmiga::Channel();
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}
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}
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bool DivPlatformAmiga::isStereo() {
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return true;
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}
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bool DivPlatformAmiga::keyOffAffectsArp(int ch) {
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return true;
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}
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void DivPlatformAmiga::notifyInsChange(int ins) {
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for (int i=0; i<4; i++) {
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if (chan[i].ins==ins) {
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chan[i].insChanged=true;
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}
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}
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}
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void DivPlatformAmiga::notifyWaveChange(int wave) {
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// TODO when wavetables are added
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}
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void DivPlatformAmiga::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 DivPlatformAmiga::setFlags(unsigned int flags) {
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if (flags&1) {
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chipClock=COLOR_PAL*4.0/5.0;
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} else {
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chipClock=COLOR_NTSC;
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}
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rate=chipClock/AMIGA_DIVIDER;
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sep1=((flags>>8)&127)+127;
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sep2=127-((flags>>8)&127);
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}
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int DivPlatformAmiga::init(DivEngine* p, int channels, int sugRate, unsigned int flags) {
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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<4; i++) {
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isMuted[i]=false;
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}
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setFlags(flags);
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reset();
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return 6;
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}
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void DivPlatformAmiga::quit() {
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}
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