409 lines
11 KiB
C++
409 lines
11 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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#define _USE_MATH_DEFINES
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#include "pcmdac.h"
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#include "../engine.h"
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#include <math.h>
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// to ease the driver, freqency register is a 8.16 counter relative to output sample rate
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#define CHIP_FREQBASE 65536
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void DivPlatformPCMDAC::acquire(short* bufL, short* bufR, size_t start, size_t len) {
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const int depthScale=(15-outDepth);
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int output=0;
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for (size_t h=start; h<start+len; h++) {
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if (!chan.active || isMuted) {
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bufL[h]=0;
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bufR[h]=0;
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oscBuf->data[oscBuf->needle++]=0;
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continue;
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}
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if (chan.useWave || (chan.sample>=0 && chan.sample<parent->song.sampleLen)) {
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chan.audPos+=((!chan.useWave) && chan.audDir)?-(chan.freq>>16):(chan.freq>>16);
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chan.audSub+=(chan.freq&0xffff);
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if (chan.audSub>=0x10000) {
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chan.audSub-=0x10000;
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chan.audPos+=((!chan.useWave) && chan.audDir)?-1:1;
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}
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if (chan.useWave) {
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if (chan.audPos>=(int)chan.audLen) {
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chan.audPos%=chan.audLen;
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chan.audDir=false;
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}
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output=(chan.ws.output[chan.audPos]-0x80)<<8;
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} else {
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DivSample* s=parent->getSample(chan.sample);
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if (s->samples>0) {
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if (chan.audDir) {
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if (s->isLoopable()) {
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switch (s->loopMode) {
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case DIV_SAMPLE_LOOP_FORWARD:
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case DIV_SAMPLE_LOOP_PINGPONG:
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if (chan.audPos<s->loopStart) {
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chan.audPos=s->loopStart+(s->loopStart-chan.audPos);
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chan.audDir=false;
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}
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break;
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case DIV_SAMPLE_LOOP_BACKWARD:
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if (chan.audPos<s->loopStart) {
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chan.audPos=s->loopEnd-1-(s->loopStart-chan.audPos);
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chan.audDir=true;
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}
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break;
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default:
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if (chan.audPos<0) {
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chan.sample=-1;
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}
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break;
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}
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} else if (chan.audPos>=(int)s->samples) {
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chan.sample=-1;
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}
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} else {
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if (s->isLoopable()) {
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switch (s->loopMode) {
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case DIV_SAMPLE_LOOP_FORWARD:
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if (chan.audPos>=s->loopEnd) {
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chan.audPos=(chan.audPos+s->loopStart)-s->loopEnd;
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chan.audDir=false;
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}
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break;
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case DIV_SAMPLE_LOOP_BACKWARD:
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case DIV_SAMPLE_LOOP_PINGPONG:
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if (chan.audPos>=s->loopEnd) {
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chan.audPos=s->loopEnd-1-(s->loopEnd-1-chan.audPos);
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chan.audDir=true;
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}
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break;
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default:
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if (chan.audPos>=(int)s->samples) {
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chan.sample=-1;
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}
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break;
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}
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} else if (chan.audPos>=(int)s->samples) {
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chan.sample=-1;
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}
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}
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if (chan.audPos>=0 && chan.audPos<(int)s->samples) {
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output=s->data16[chan.audPos];
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}
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} else {
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chan.sample=-1;
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}
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}
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}
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output=output*chan.vol*chan.envVol/16384;
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oscBuf->data[oscBuf->needle++]=output;
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if (outStereo) {
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bufL[h]=((output*chan.panL)>>(depthScale+8))<<depthScale;
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bufR[h]=((output*chan.panR)>>(depthScale+8))<<depthScale;
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} else {
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output=(output>>depthScale)<<depthScale;
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bufL[h]=output;
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bufR[h]=output;
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}
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}
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}
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void DivPlatformPCMDAC::tick(bool sysTick) {
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chan.std.next();
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if (chan.std.vol.had) {
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chan.envVol=chan.std.vol.val;
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}
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if (chan.std.arp.had) {
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if (!chan.inPorta) {
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chan.baseFreq=NOTE_FREQUENCY(parent->calcArp(chan.note,chan.std.arp.val));
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}
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chan.freqChanged=true;
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}
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if (chan.useWave && chan.std.wave.had) {
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if (chan.wave!=chan.std.wave.val || chan.ws.activeChanged()) {
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chan.wave=chan.std.wave.val;
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chan.ws.changeWave1(chan.wave);
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if (!chan.keyOff) chan.keyOn=true;
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}
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}
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if (chan.useWave && chan.active) {
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chan.ws.tick();
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}
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if (chan.std.pitch.had) {
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if (chan.std.pitch.mode) {
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chan.pitch2+=chan.std.pitch.val;
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CLAMP_VAR(chan.pitch2,-32768,32767);
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} else {
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chan.pitch2=chan.std.pitch.val;
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}
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chan.freqChanged=true;
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}
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if (chan.std.panL.had) {
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int val=chan.std.panL.val&0x7f;
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chan.panL=val*2;
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}
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if (chan.std.panR.had) {
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int val=chan.std.panR.val&0x7f;
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chan.panR=val*2;
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}
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if (chan.std.phaseReset.had) {
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if (chan.std.phaseReset.val==1) {
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chan.audDir=false;
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chan.audPos=0;
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}
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}
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if (chan.freqChanged || chan.keyOn || chan.keyOff) {
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//DivInstrument* ins=parent->getIns(chan.ins,DIV_INS_AMIGA);
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double off=1.0;
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if (!chan.useWave && chan.sample>=0 && chan.sample<parent->song.sampleLen) {
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DivSample* s=parent->getSample(chan.sample);
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off=(s->centerRate>=1)?((double)s->centerRate/8363.0):1.0;
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}
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chan.freq=off*parent->calcFreq(chan.baseFreq,chan.pitch,false,2,chan.pitch2,chipClock,CHIP_FREQBASE);
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if (chan.freq>16777215) chan.freq=16777215;
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if (chan.keyOn) {
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if (!chan.std.vol.had) {
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chan.envVol=64;
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}
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chan.keyOn=false;
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}
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if (chan.keyOff) {
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chan.keyOff=false;
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}
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chan.freqChanged=false;
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}
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}
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int DivPlatformPCMDAC::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.ins,DIV_INS_AMIGA);
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if (ins->amiga.useWave) {
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chan.useWave=true;
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chan.audLen=ins->amiga.waveLen+1;
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if (chan.insChanged) {
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if (chan.wave<0) {
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chan.wave=0;
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chan.ws.setWidth(chan.audLen);
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chan.ws.changeWave1(chan.wave);
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}
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}
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} else {
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chan.sample=ins->amiga.getSample(c.value);
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chan.useWave=false;
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}
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if (c.value!=DIV_NOTE_NULL) {
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chan.baseFreq=round(NOTE_FREQUENCY(c.value));
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}
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if (chan.useWave || chan.sample<0 || chan.sample>=parent->song.sampleLen) {
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chan.sample=-1;
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}
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if (chan.setPos) {
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chan.setPos=false;
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} else {
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chan.audDir=false;
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chan.audPos=0;
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}
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chan.audSub=0;
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if (c.value!=DIV_NOTE_NULL) {
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chan.freqChanged=true;
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chan.note=c.value;
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}
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chan.active=true;
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chan.keyOn=true;
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chan.macroInit(ins);
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if (!parent->song.brokenOutVol && !chan.std.vol.will) {
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chan.envVol=64;
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}
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if (chan.useWave) {
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chan.ws.init(ins,chan.audLen,255,chan.insChanged);
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}
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chan.insChanged=false;
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break;
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}
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case DIV_CMD_NOTE_OFF:
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chan.sample=-1;
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chan.active=false;
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chan.keyOff=true;
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chan.macroInit(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.std.release();
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break;
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case DIV_CMD_INSTRUMENT:
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if (chan.ins!=c.value || c.value2==1) {
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chan.ins=c.value;
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chan.insChanged=true;
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}
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break;
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case DIV_CMD_VOLUME:
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if (chan.vol!=c.value) {
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chan.vol=c.value;
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if (!chan.std.vol.has) {
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chan.envVol=64;
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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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return chan.vol;
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break;
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case DIV_CMD_PANNING:
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chan.panL=c.value;
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chan.panR=c.value2;
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break;
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case DIV_CMD_PITCH:
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chan.pitch=c.value;
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chan.freqChanged=true;
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break;
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case DIV_CMD_WAVE:
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if (!chan.useWave) break;
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chan.wave=c.value;
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chan.keyOn=true;
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chan.ws.changeWave1(chan.wave);
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break;
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case DIV_CMD_NOTE_PORTA: {
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DivInstrument* ins=parent->getIns(chan.ins,DIV_INS_AMIGA);
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chan.sample=ins->amiga.getSample(c.value2);
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int destFreq=round(NOTE_FREQUENCY(c.value2));
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bool return2=false;
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if (destFreq>chan.baseFreq) {
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chan.baseFreq+=c.value;
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if (chan.baseFreq>=destFreq) {
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chan.baseFreq=destFreq;
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return2=true;
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}
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} else {
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chan.baseFreq-=c.value;
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if (chan.baseFreq<=destFreq) {
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chan.baseFreq=destFreq;
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return2=true;
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}
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}
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chan.freqChanged=true;
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if (return2) {
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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.baseFreq=round(NOTE_FREQUENCY(c.value+((chan.std.arp.will && !chan.std.arp.mode)?(chan.std.arp.val):(0))));
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chan.freqChanged=true;
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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.active && c.value2) {
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if (parent->song.resetMacroOnPorta) chan.macroInit(parent->getIns(chan.ins,DIV_INS_AMIGA));
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}
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chan.inPorta=c.value;
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break;
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case DIV_CMD_SAMPLE_POS:
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if (chan.useWave) break;
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chan.audPos=c.value;
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chan.setPos=true;
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break;
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case DIV_CMD_GET_VOLMAX:
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return 255;
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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 DivPlatformPCMDAC::muteChannel(int ch, bool mute) {
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isMuted=mute;
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}
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void DivPlatformPCMDAC::forceIns() {
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chan.insChanged=true;
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chan.freqChanged=true;
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chan.audDir=false;
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chan.audPos=0;
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chan.sample=-1;
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}
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void* DivPlatformPCMDAC::getChanState(int ch) {
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return &chan;
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}
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DivDispatchOscBuffer* DivPlatformPCMDAC::getOscBuffer(int ch) {
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return oscBuf;
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}
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void DivPlatformPCMDAC::reset() {
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chan=DivPlatformPCMDAC::Channel();
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chan.std.setEngine(parent);
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chan.ws.setEngine(parent);
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chan.ws.init(NULL,32,255);
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}
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bool DivPlatformPCMDAC::isStereo() {
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return true;
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}
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DivMacroInt* DivPlatformPCMDAC::getChanMacroInt(int ch) {
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return &chan.std;
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}
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void DivPlatformPCMDAC::notifyInsChange(int ins) {
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if (chan.ins==ins) {
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chan.insChanged=true;
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}
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}
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void DivPlatformPCMDAC::notifyWaveChange(int wave) {
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if (chan.useWave && chan.wave==wave) {
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chan.ws.changeWave1(wave);
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}
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}
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void DivPlatformPCMDAC::notifyInsDeletion(void* ins) {
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chan.std.notifyInsDeletion((DivInstrument*)ins);
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}
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void DivPlatformPCMDAC::setFlags(const DivConfig& flags) {
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// default to 44100Hz 16-bit stereo
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rate=flags.getInt("rate",44100);
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// rate can't be too low or the resampler will break
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if (rate<1000) rate=1000;
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chipClock=rate;
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outDepth=(flags.getInt("outDepth",15))&15;
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outStereo=flags.getBool("stereo",true);
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}
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int DivPlatformPCMDAC::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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oscBuf=new DivDispatchOscBuffer;
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isMuted=false;
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setFlags(flags);
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reset();
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return 1;
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}
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void DivPlatformPCMDAC::quit() {
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delete oscBuf;
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}
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