mirror of
https://github.com/tildearrow/furnace.git
synced 2024-11-14 00:35:06 +00:00
349 lines
9.1 KiB
C++
349 lines
9.1 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 "zxbeeper.h"
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#include "../engine.h"
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#include <math.h>
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#define CHIP_FREQBASE 8192*6
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const char** DivPlatformZXBeeper::getRegisterSheet() {
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return NULL;
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}
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const char* DivPlatformZXBeeper::getEffectName(unsigned char effect) {
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switch (effect) {
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case 0x12:
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return "12xx: Set pulse width";
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break;
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case 0x17:
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return "17xx: Trigger overlay drum";
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break;
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}
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return NULL;
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}
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void DivPlatformZXBeeper::acquire(short* bufL, short* bufR, size_t start, size_t len) {
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bool o=false;
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for (size_t h=start; h<start+len; h++) {
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// clock here
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if (curSample>=0 && curSample<parent->song.sampleLen) {
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if (--curSamplePeriod<0) {
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DivSample* s=parent->getSample(curSample);
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if (s->samples>0) {
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sampleOut=(s->data8[curSamplePos++]>0);
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if (curSamplePos>=s->samples) curSample=-1;
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// 256 bits
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if (curSamplePos>2047) curSample=-1;
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curSamplePeriod=15;
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} else {
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curSample=-1;
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}
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}
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o=sampleOut;
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bufL[h]=o?16384:0;
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oscBuf[0]->data[oscBuf[0]->needle++]=o?16384:-16384;
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continue;
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}
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unsigned short oldPos=chan[curChan].sPosition;
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o=false;
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if (sOffTimer) {
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sOffTimer--;
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o=true;
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}
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chan[curChan].sPosition+=chan[curChan].freq;
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if (oldPos>chan[curChan].sPosition) {
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if (!isMuted[curChan] && chan[curChan].outVol) sOffTimer+=chan[curChan].duty;
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}
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if (++curChan>=6) curChan=0;
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bufL[h]=o?16384:0;
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oscBuf[0]->data[oscBuf[0]->needle++]=o?16384:-16384;
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}
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}
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void DivPlatformZXBeeper::tick(bool sysTick) {
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for (int i=0; i<6; i++) {
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chan[i].std.next();
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if (chan[i].std.vol.had) {
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chan[i].outVol=((chan[i].vol&1)*MIN(1,chan[i].std.vol.val));
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}
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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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chan[i].freqChanged=true;
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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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if (chan[i].std.arp.mode) {
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chan[i].baseFreq=NOTE_FREQUENCY(chan[i].std.arp.val);
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} else {
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chan[i].baseFreq=NOTE_FREQUENCY(chan[i].note+chan[i].std.arp.val);
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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.arp.mode && chan[i].std.arp.finished) {
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chan[i].baseFreq=NOTE_FREQUENCY(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.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].freqChanged || chan[i].keyOn || chan[i].keyOff) {
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if (chan[i].active) {
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chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,2,chan[i].pitch2,chipClock,CHIP_FREQBASE);
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if (chan[i].freq>65535) chan[i].freq=65535;
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}
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if (chan[i].keyOn) {
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//rWrite(16+i*5,0x80);
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//chWrite(i,0x04,0x80|chan[i].vol);
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}
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if (chan[i].keyOff) {
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chan[i].freq=0;
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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 DivPlatformZXBeeper::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_BEEPER);
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if (c.value!=DIV_NOTE_NULL) {
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chan[c.chan].baseFreq=NOTE_FREQUENCY(c.value);
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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].macroInit(ins);
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chan[c.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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if (dumpWrites) addWrite(0xffff0002+(c.chan<<8),0);
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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].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[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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chan[c.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[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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}
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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_FREQUENCY(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_STD_NOISE_MODE:
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chan[c.chan].duty=c.value;
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break;
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case DIV_CMD_SAMPLE_MODE:
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if (isMuted[c.chan]) break;
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curSample=c.value;
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curSamplePos=0;
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curSamplePeriod=0;
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break;
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case DIV_CMD_LEGATO:
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chan[c.chan].baseFreq=NOTE_FREQUENCY(c.value+((chan[c.chan].std.arp.will && !chan[c.chan].std.arp.mode)?(chan[c.chan].std.arp.val):(0)));
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chan[c.chan].freqChanged=true;
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chan[c.chan].note=c.value;
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break;
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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_BEEPER));
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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 1;
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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 DivPlatformZXBeeper::muteChannel(int ch, bool mute) {
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isMuted[ch]=mute;
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}
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void DivPlatformZXBeeper::forceIns() {
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for (int i=0; i<6; i++) {
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chan[i].insChanged=true;
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chan[i].freqChanged=true;
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}
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}
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void* DivPlatformZXBeeper::getChanState(int ch) {
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return &chan[ch];
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}
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DivMacroInt* DivPlatformZXBeeper::getChanMacroInt(int ch) {
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return &chan[ch].std;
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}
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DivDispatchOscBuffer* DivPlatformZXBeeper::getOscBuffer(int ch) {
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return (ch<1)?oscBuf[ch]:NULL;
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}
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unsigned char* DivPlatformZXBeeper::getRegisterPool() {
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ulaOut=sOffTimer?0x10:0x08;
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return &ulaOut;
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}
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int DivPlatformZXBeeper::getRegisterPoolSize() {
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return 1;
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}
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void DivPlatformZXBeeper::reset() {
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while (!writes.empty()) writes.pop();
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memset(regPool,0,128);
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for (int i=0; i<6; i++) {
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chan[i]=DivPlatformZXBeeper::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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lastPan=0xff;
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memset(tempL,0,32*sizeof(int));
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memset(tempR,0,32*sizeof(int));
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cycles=0;
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curChan=0;
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sOffTimer=0;
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ulaOut=0;
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curSample=-1;
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curSamplePos=0;
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curSamplePeriod=0;
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sampleOut=false;
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}
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bool DivPlatformZXBeeper::keyOffAffectsArp(int ch) {
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return true;
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}
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void DivPlatformZXBeeper::notifyWaveChange(int wave) {
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}
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void DivPlatformZXBeeper::notifyInsDeletion(void* ins) {
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for (int i=0; i<6; i++) {
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chan[i].std.notifyInsDeletion((DivInstrument*)ins);
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}
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}
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void DivPlatformZXBeeper::setFlags(unsigned int flags) {
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if (flags&1) { // technically there is no PAL PC Engine but oh well...
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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/4;
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for (int i=0; i<6; i++) {
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oscBuf[i]->rate=rate;
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}
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}
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void DivPlatformZXBeeper::poke(unsigned int addr, unsigned short val) {
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}
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void DivPlatformZXBeeper::poke(std::vector<DivRegWrite>& wlist) {
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}
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int DivPlatformZXBeeper::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<6; i++) {
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isMuted[i]=false;
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oscBuf[i]=new DivDispatchOscBuffer;
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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 DivPlatformZXBeeper::quit() {
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for (int i=0; i<6; i++) {
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delete oscBuf[i];
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}
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}
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DivPlatformZXBeeper::~DivPlatformZXBeeper() {
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}
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