402 lines
11 KiB
C++
402 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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#include "segapcm.h"
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#include "../engine.h"
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#include <string.h>
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#include <math.h>
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//#define rWrite(a,v) if (!skipRegisterWrites) {pendingWrites[a]=v;}
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//#define immWrite(a,v) if (!skipRegisterWrites) {writes.emplace(a,v); if (dumpWrites) {addWrite(a,v);} }
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const char* DivPlatformSegaPCM::getEffectName(unsigned char effect) {
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switch (effect) {
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case 0x20:
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return "20xx: Set PCM frequency";
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break;
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}
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return NULL;
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}
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void DivPlatformSegaPCM::acquire(short* bufL, short* bufR, size_t start, size_t len) {
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static int os[2];
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for (size_t h=start; h<start+len; h++) {
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os[0]=0; os[1]=0;
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// do a PCM cycle
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pcmL=0; pcmR=0;
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for (int i=0; i<16; i++) {
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if (chan[i].pcm.sample>=0 && chan[i].pcm.sample<parent->song.sampleLen) {
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DivSample* s=parent->song.sample[chan[i].pcm.sample];
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if (s->samples<=0) {
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chan[i].pcm.sample=-1;
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continue;
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}
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if (!isMuted[i]) {
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pcmL+=(s->data8[chan[i].pcm.pos>>8]*chan[i].chVolL);
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pcmR+=(s->data8[chan[i].pcm.pos>>8]*chan[i].chVolR);
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}
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chan[i].pcm.pos+=chan[i].pcm.freq;
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if (chan[i].pcm.pos>=(s->samples<<8)) {
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if (s->loopStart>=0 && s->loopStart<=(int)s->samples) {
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chan[i].pcm.pos=s->loopStart<<8;
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} else {
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chan[i].pcm.sample=-1;
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}
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}
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}
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}
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os[0]=pcmL;
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if (os[0]<-32768) os[0]=-32768;
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if (os[0]>32767) os[0]=32767;
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os[1]=pcmR;
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if (os[1]<-32768) os[1]=-32768;
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if (os[1]>32767) os[1]=32767;
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bufL[h]=os[0];
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bufR[h]=os[1];
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}
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}
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void DivPlatformSegaPCM::tick() {
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for (int i=0; i<16; 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*MIN(127,chan[i].std.vol))/127;
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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=(chan[i].std.arp<<6)+baseFreqOff;
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} else {
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chan[i].baseFreq=((chan[i].note+(signed char)chan[i].std.arp)<<6)+baseFreqOff;
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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=(chan[i].note<<6)+baseFreqOff;
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chan[i].freqChanged=true;
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}
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}
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/*if (chan[i].keyOn || chan[i].keyOff) {
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chan[i].keyOff=false;
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}*/
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}
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for (int i=0; i<16; i++) {
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if (chan[i].freqChanged) {
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chan[i].freq=chan[i].baseFreq+(chan[i].pitch>>1)-64;
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if (chan[i].furnacePCM) {
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double off=1.0;
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if (chan[i].pcm.sample>=0 && chan[i].pcm.sample<parent->song.sampleLen) {
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DivSample* s=parent->song.sample[chan[i].pcm.sample];
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off=(double)s->centerRate/8363.0;
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}
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chan[i].pcm.freq=MIN(255,((off*parent->song.tuning*pow(2.0,double(chan[i].freq+256)/(64.0*12.0)))*255)/31250);
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if (dumpWrites && i>=8) {
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addWrite(0x10007+((i-8)<<3),chan[i].pcm.freq);
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}
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}
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chan[i].freqChanged=false;
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}
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}
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}
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void DivPlatformSegaPCM::muteChannel(int ch, bool mute) {
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isMuted[ch]=mute;
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}
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int DivPlatformSegaPCM::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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if (skipRegisterWrites) break;
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if (ins->type==DIV_INS_AMIGA) {
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chan[c.chan].pcm.sample=ins->amiga.initSample;
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if (chan[c.chan].pcm.sample<0 || chan[c.chan].pcm.sample>=parent->song.sampleLen) {
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chan[c.chan].pcm.sample=-1;
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if (dumpWrites) {
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addWrite(0x10086+(c.chan<<3),3);
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}
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break;
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}
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chan[c.chan].pcm.pos=0;
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chan[c.chan].baseFreq=(c.value<<6);
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chan[c.chan].freqChanged=true;
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chan[c.chan].furnacePCM=true;
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if (dumpWrites) { // Sega PCM writes
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DivSample* s=parent->song.sample[chan[c.chan].pcm.sample];
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addWrite(0x10086+(c.chan<<3),3+((s->offSegaPCM>>16)<<3));
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addWrite(0x10084+(c.chan<<3),(s->offSegaPCM)&0xff);
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addWrite(0x10085+(c.chan<<3),(s->offSegaPCM>>8)&0xff);
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addWrite(0x10006+(c.chan<<3),MIN(255,((s->offSegaPCM&0xffff)+s->length8-1)>>8));
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if (s->loopStart<0 || s->loopStart>=(int)s->length8) {
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addWrite(0x10086+(c.chan<<3),2+((s->offSegaPCM>>16)<<3));
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} else {
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int loopPos=(s->offSegaPCM&0xffff)+s->loopStart+s->loopOffP;
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addWrite(0x10004+(c.chan<<3),loopPos&0xff);
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addWrite(0x10005+(c.chan<<3),(loopPos>>8)&0xff);
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addWrite(0x10086+(c.chan<<3),((s->offSegaPCM>>16)<<3));
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}
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}
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} else {
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if (c.value!=DIV_NOTE_NULL) {
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chan[c.chan].note=c.value;
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}
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chan[c.chan].pcm.sample=12*sampleBank+chan[c.chan].note%12;
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if (chan[c.chan].pcm.sample>=parent->song.sampleLen) {
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chan[c.chan].pcm.sample=-1;
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if (dumpWrites) {
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addWrite(0x10086+(c.chan<<3),3);
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}
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break;
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}
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chan[c.chan].pcm.pos=0;
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chan[c.chan].pcm.freq=MIN(255,(parent->song.sample[chan[c.chan].pcm.sample]->rate*255)/31250);
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chan[c.chan].furnacePCM=false;
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if (dumpWrites) { // Sega PCM writes
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DivSample* s=parent->song.sample[chan[c.chan].pcm.sample];
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addWrite(0x10086+(c.chan<<3),3+((s->offSegaPCM>>16)<<3));
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addWrite(0x10084+(c.chan<<3),(s->offSegaPCM)&0xff);
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addWrite(0x10085+(c.chan<<3),(s->offSegaPCM>>8)&0xff);
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addWrite(0x10006+(c.chan<<3),MIN(255,((s->offSegaPCM&0xffff)+s->length8-1)>>8));
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if (s->loopStart<0 || s->loopStart>=(int)s->length8) {
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addWrite(0x10086+(c.chan<<3),2+((s->offSegaPCM>>16)<<3));
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} else {
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int loopPos=(s->offSegaPCM&0xffff)+s->loopStart+s->loopOffP;
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addWrite(0x10004+(c.chan<<3),loopPos&0xff);
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addWrite(0x10005+(c.chan<<3),(loopPos>>8)&0xff);
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addWrite(0x10086+(c.chan<<3),((s->offSegaPCM>>16)<<3));
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}
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addWrite(0x10007+(c.chan<<3),chan[c.chan].pcm.freq);
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}
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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].pcm.sample=-1;
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if (dumpWrites) {
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addWrite(0x10086+(c.chan<<3),3);
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}
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chan[c.chan].keyOff=true;
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chan[c.chan].keyOn=false;
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chan[c.chan].active=false;
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break;
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case DIV_CMD_NOTE_OFF_ENV:
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chan[c.chan].keyOff=true;
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chan[c.chan].keyOn=false;
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chan[c.chan].active=false;
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chan[c.chan].std.release();
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break;
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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_VOLUME: {
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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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chan[c.chan].chVolL=c.value;
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chan[c.chan].chVolR=c.value;
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if (dumpWrites) {
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addWrite(0x10002+(c.chan<<3),chan[c.chan].chVolL);
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addWrite(0x10003+(c.chan<<3),chan[c.chan].chVolR);
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}
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break;
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}
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case DIV_CMD_GET_VOLUME: {
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return chan[c.chan].vol;
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break;
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}
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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].insChanged=true;
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}
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chan[c.chan].ins=c.value;
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break;
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case DIV_CMD_PANNING: {
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chan[c.chan].chVolL=(c.value>>4)|(((c.value>>4)>>1)<<4);
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chan[c.chan].chVolR=(c.value&15)|(((c.value&15)>>1)<<4);
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if (dumpWrites) {
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addWrite(0x10002+(c.chan<<3),chan[c.chan].chVolL);
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addWrite(0x10003+(c.chan<<3),chan[c.chan].chVolR);
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}
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break;
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}
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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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}
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case DIV_CMD_NOTE_PORTA: {
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int destFreq=(c.value2<<6)+baseFreqOff;
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int newFreq;
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bool return2=false;
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if (destFreq>chan[c.chan].baseFreq) {
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newFreq=chan[c.chan].baseFreq+c.value;
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if (newFreq>=destFreq) {
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newFreq=destFreq;
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return2=true;
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}
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} else {
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newFreq=chan[c.chan].baseFreq-c.value;
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if (newFreq<=destFreq) {
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newFreq=destFreq;
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return2=true;
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}
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}
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chan[c.chan].baseFreq=newFreq;
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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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chan[c.chan].baseFreq=(c.value<<6)+baseFreqOff;
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chan[c.chan].freqChanged=true;
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break;
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}
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case DIV_CMD_SAMPLE_BANK:
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sampleBank=c.value;
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if (sampleBank>(parent->song.sample.size()/12)) {
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sampleBank=parent->song.sample.size()/12;
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}
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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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case DIV_CMD_GET_VOLMAX:
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return 127;
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break;
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case DIV_CMD_PRE_PORTA:
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chan[c.chan].inPorta=c.value;
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break;
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case DIV_CMD_PRE_NOTE:
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break;
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case DIV_CMD_SAMPLE_FREQ:
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chan[c.chan].pcm.freq=c.value;
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if (dumpWrites) {
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addWrite(0x10007+(c.chan<<3),chan[c.chan].pcm.freq);
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}
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break;
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default:
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//printf("WARNING: unimplemented command %d\n",c.cmd);
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break;
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}
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return 1;
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}
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void DivPlatformSegaPCM::forceIns() {
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for (int i=0; i<16; i++) {
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chan[i].insChanged=true;
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}
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}
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void DivPlatformSegaPCM::notifyInsChange(int ins) {
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for (int i=0; i<16; 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* DivPlatformSegaPCM::getChanState(int ch) {
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return &chan[ch];
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}
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unsigned char* DivPlatformSegaPCM::getRegisterPool() {
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return regPool;
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}
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int DivPlatformSegaPCM::getRegisterPoolSize() {
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return 256;
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}
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void DivPlatformSegaPCM::poke(unsigned int addr, unsigned short val) {
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//immWrite(addr,val);
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}
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void DivPlatformSegaPCM::poke(std::vector<DivRegWrite>& wlist) {
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//for (DivRegWrite& i: wlist) immWrite(i.addr,i.val);
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}
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void DivPlatformSegaPCM::reset() {
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while (!writes.empty()) writes.pop();
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memset(regPool,0,256);
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for (int i=0; i<16; i++) {
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chan[i]=DivPlatformSegaPCM::Channel();
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chan[i].vol=0x7f;
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chan[i].outVol=0x7f;
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}
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lastBusy=60;
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pcmCycles=0;
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pcmL=0;
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pcmR=0;
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sampleBank=0;
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delay=0;
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amDepth=0x7f;
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pmDepth=0x7f;
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if (dumpWrites) {
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for (int i=0; i<16; i++) {
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addWrite(0x10086+(i<<3),3);
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addWrite(0x10002+(i<<3),0x7f);
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addWrite(0x10003+(i<<3),0x7f);
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}
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}
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extMode=false;
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}
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void DivPlatformSegaPCM::setFlags(unsigned int flags) {
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chipClock=8000000.0;
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rate=31250;
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}
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bool DivPlatformSegaPCM::isStereo() {
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return true;
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}
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int DivPlatformSegaPCM::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<16; 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 16;
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}
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void DivPlatformSegaPCM::quit() {
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}
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DivPlatformSegaPCM::~DivPlatformSegaPCM() {
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}
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