373 lines
10 KiB
C++
373 lines
10 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 "sms.h"
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#include "../engine.h"
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#include <math.h>
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#define rWrite(v) {if (!skipRegisterWrites) {sn->write(v); if (dumpWrites) {addWrite(0x200,v);}}}
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#define CHIP_DIVIDER 64
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const char* regCheatSheetSN[]={
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"DATA", "0",
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NULL
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};
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const char** DivPlatformSMS::getRegisterSheet() {
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return regCheatSheetSN;
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}
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const char* DivPlatformSMS::getEffectName(unsigned char effect) {
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switch (effect) {
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case 0x20:
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return "20xy: Set noise mode (x: preset freq/ch3 freq; y: thin pulse/noise)";
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break;
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}
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return NULL;
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}
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void DivPlatformSMS::acquire(short* bufL, short* bufR, size_t start, size_t len) {
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sn->sound_stream_update(bufL+start,len);
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}
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int DivPlatformSMS::acquireOne() {
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short v;
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sn->sound_stream_update(&v,1);
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return v;
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}
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void DivPlatformSMS::tick(bool sysTick) {
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for (int i=0; i<4; i++) {
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chan[i].std.next();
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if (chan[i].std.vol.had) {
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chan[i].outVol=MIN(15,chan[i].std.vol.val)-(15-(chan[i].vol&15));
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if (chan[i].outVol<0) chan[i].outVol=0;
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// old formula
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// ((chan[i].vol&15)*MIN(15,chan[i].std.vol.val))>>4;
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rWrite(0x90|(i<<5)|(isMuted[i]?15:(15-(chan[i].outVol&15))));
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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_PERIODIC(chan[i].std.arp.val);
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chan[i].actualNote=chan[i].std.arp.val;
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} else {
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// TODO: check whether this weird octave boundary thing applies to other systems as well
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int areYouSerious=chan[i].note+chan[i].std.arp.val;
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while (areYouSerious>0x60) areYouSerious-=12;
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chan[i].baseFreq=NOTE_PERIODIC(areYouSerious);
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chan[i].actualNote=areYouSerious;
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}
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chan[i].freqChanged=true;
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}
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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_PERIODIC(chan[i].note);
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chan[i].actualNote=chan[i].note;
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chan[i].freqChanged=true;
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}
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}
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if (i==3) {
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if (chan[i].std.duty.had) {
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snNoiseMode=chan[i].std.duty.val;
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if (chan[i].std.duty.val<2) {
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chan[3].freqChanged=false;
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}
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updateSNMode=true;
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}
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if (chan[i].std.phaseReset.had) {
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if (chan[i].std.phaseReset.val==1) {
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updateSNMode=true;
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}
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}
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}
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}
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for (int i=0; i<3; i++) {
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if (chan[i].freqChanged) {
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chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true)+chan[i].std.pitch.val;
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if (chan[i].freq>1023) chan[i].freq=1023;
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if (chan[i].freq<8) chan[i].freq=1;
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//if (chan[i].actualNote>0x5d) chan[i].freq=0x01;
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rWrite(0x80|i<<5|(chan[i].freq&15));
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rWrite(chan[i].freq>>4);
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// what?
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/*if (i==2 && snNoiseMode&2) {
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chan[3].baseFreq=chan[2].baseFreq;
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chan[3].actualNote=chan[2].actualNote;
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}*/
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chan[i].freqChanged=false;
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}
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}
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if (chan[3].freqChanged || updateSNMode) {
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// seems arbitrary huh?
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chan[3].freq=parent->calcFreq(chan[3].baseFreq,chan[3].pitch-1-(isRealSN?127:0),true)+chan[3].std.pitch.val;
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if (chan[3].freq>1023) chan[3].freq=1023;
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if (chan[3].actualNote>0x5d) chan[3].freq=0x01;
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if (snNoiseMode&2) { // take period from channel 3
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if (updateSNMode || resetPhase) {
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if (snNoiseMode&1) {
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rWrite(0xe7);
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} else {
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rWrite(0xe3);
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}
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if (updateSNMode) {
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rWrite(0xdf);
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}
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}
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if (chan[3].freqChanged) {
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rWrite(0xc0|(chan[3].freq&15));
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rWrite(chan[3].freq>>4);
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}
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} else { // 3 fixed values
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unsigned char value;
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if (chan[3].std.arp.had) {
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if (chan[3].std.arp.mode) {
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value=chan[3].std.arp.val%12;
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} else {
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value=(chan[3].note+chan[3].std.arp.val)%12;
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}
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} else {
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value=chan[3].note%12;
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}
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if (value<3) {
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value=2-value;
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if (value!=oldValue || updateSNMode || resetPhase) {
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oldValue=value;
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rWrite(0xe0|value|((snNoiseMode&1)<<2));
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}
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}
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}
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chan[3].freqChanged=false;
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updateSNMode=false;
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}
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}
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int DivPlatformSMS::dispatch(DivCommand c) {
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switch (c.cmd) {
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case DIV_CMD_NOTE_ON:
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if (c.value!=DIV_NOTE_NULL) {
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chan[c.chan].baseFreq=NOTE_PERIODIC(c.value);
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chan[c.chan].freqChanged=true;
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chan[c.chan].note=c.value;
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chan[c.chan].actualNote=c.value;
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}
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chan[c.chan].active=true;
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rWrite(0x90|c.chan<<5|(isMuted[c.chan]?15:(15-(chan[c.chan].vol&15))));
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chan[c.chan].std.init(parent->getIns(chan[c.chan].ins));
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break;
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case DIV_CMD_NOTE_OFF:
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chan[c.chan].active=false;
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rWrite(0x9f|c.chan<<5);
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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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chan[c.chan].ins=c.value;
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//chan[c.chan].std.init(parent->getIns(chan[c.chan].ins));
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break;
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case DIV_CMD_VOLUME:
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if (chan[c.chan].vol!=c.value) {
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chan[c.chan].vol=c.value;
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if (!chan[c.chan].std.vol.has) {
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chan[c.chan].outVol=c.value;
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}
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if (chan[c.chan].active) rWrite(0x90|c.chan<<5|(isMuted[c.chan]?15:(15-(chan[c.chan].vol&15))));
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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_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_STD_NOISE_MODE:
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snNoiseMode=(c.value&1)|((c.value&16)>>3);
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updateSNMode=true;
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break;
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case DIV_CMD_LEGATO:
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chan[c.chan].baseFreq=NOTE_PERIODIC(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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chan[c.chan].actualNote=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].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 15;
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break;
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case DIV_ALWAYS_SET_VOLUME:
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return 0;
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break;
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default:
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break;
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}
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return 1;
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}
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void DivPlatformSMS::muteChannel(int ch, bool mute) {
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isMuted[ch]=mute;
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if (chan[ch].active) rWrite(0x90|ch<<5|(isMuted[ch]?15:(15-(chan[ch].outVol&15))));
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}
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void DivPlatformSMS::forceIns() {
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for (int i=0; i<4; i++) {
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if (chan[i].active) {
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chan[i].insChanged=true;
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chan[i].freqChanged=true;
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}
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}
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updateSNMode=true;
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}
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void* DivPlatformSMS::getChanState(int ch) {
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return &chan[ch];
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}
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void DivPlatformSMS::reset() {
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for (int i=0; i<4; i++) {
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chan[i]=DivPlatformSMS::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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sn->device_start();
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snNoiseMode=3;
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rWrite(0xe7);
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updateSNMode=false;
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oldValue=0xff;
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}
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bool DivPlatformSMS::keyOffAffectsArp(int ch) {
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return true;
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}
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bool DivPlatformSMS::keyOffAffectsPorta(int ch) {
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return true;
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}
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int DivPlatformSMS::getPortaFloor(int ch) {
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return 12;
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}
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void DivPlatformSMS::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 DivPlatformSMS::poke(unsigned int addr, unsigned short val) {
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rWrite(val);
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}
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void DivPlatformSMS::poke(std::vector<DivRegWrite>& wlist) {
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for (DivRegWrite& i: wlist) rWrite(i.val);
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}
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void DivPlatformSMS::setFlags(unsigned int flags) {
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if ((flags&3)==3) {
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chipClock=COLOR_NTSC/2.0;
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} else if ((flags&3)==2) {
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chipClock=4000000;
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} else if ((flags&3)==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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resetPhase=!(flags&16);
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if (sn!=NULL) delete sn;
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switch ((flags>>2)&3) {
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case 1: // TI
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sn=new sn76496_base_device(0x4000, 0x4000, 0x01, 0x02, true, 1, false, true);
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isRealSN=true;
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break;
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case 2: // TI+Atari
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sn=new sn76496_base_device(0x4000, 0x0f35, 0x01, 0x02, true, 1, false, true);
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isRealSN=true;
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break;
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case 3: // Game Gear (not fully emulated yet!)
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sn=new sn76496_base_device(0x8000, 0x8000, 0x01, 0x08, false, 1, false, false);
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isRealSN=false;
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break;
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default: // Sega
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sn=new sn76496_base_device(0x8000, 0x8000, 0x01, 0x08, false, 1, false, false);
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isRealSN=false;
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break;
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}
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rate=chipClock/16;
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}
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int DivPlatformSMS::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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resetPhase=false;
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oldValue=0xff;
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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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sn=NULL;
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setFlags(flags);
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reset();
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return 4;
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}
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void DivPlatformSMS::quit() {
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if (sn!=NULL) delete sn;
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}
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DivPlatformSMS::~DivPlatformSMS() {
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}
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