initial FDS bring-up
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tildearrow
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14 changed files with 870 additions and 1 deletions
383
src/engine/platform/fds.cpp
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383
src/engine/platform/fds.cpp
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/**
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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 "fds.h"
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#include "sound/nes/cpu_inline.h"
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#include "../engine.h"
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#include <math.h>
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#define CHIP_FREQBASE 262144
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#define rWrite(a,v) if (!skipRegisterWrites) {fds_wr_mem(fds,a,v); regPool[(a)&0x7f]=v; if (dumpWrites) {addWrite(a,v);} }
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const char** DivPlatformFDS::getRegisterSheet() {
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return NULL;
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}
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const char* DivPlatformFDS::getEffectName(unsigned char effect) {
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switch (effect) {
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case 0x12:
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return "12xx: Set duty cycle/noise mode (pulse: 0 to 3; noise: 0 or 1)";
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break;
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case 0x13:
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return "13xy: Sweep up (x: time; y: shift)";
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break;
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case 0x14:
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return "14xy: Sweep down (x: time; y: shift)";
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break;
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}
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return NULL;
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}
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void DivPlatformFDS::acquire(short* bufL, short* bufR, size_t start, size_t len) {
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for (size_t i=start; i<start+len; i++) {
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extcl_apu_tick_FDS(fds);
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int sample=isMuted[0]?0:fds->snd.main.output;
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if (sample>32767) sample=32767;
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if (sample<-32768) sample=-32768;
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bufL[i]=sample;
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}
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}
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void DivPlatformFDS::updateWave() {
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DivWavetable* wt=parent->getWave(chan[0].wave);
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// TODO: master volume
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rWrite(0x4089,0x80);
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for (int i=0; i<64; i++) {
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if (wt->max<1 || wt->len<1) {
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rWrite(0x4040+i,0);
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} else {
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int data=wt->data[i*wt->len/64]*63/wt->max;
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if (data<0) data=0;
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if (data>63) data=63;
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rWrite(0x4040+i,data);
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}
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}
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rWrite(0x4089,0);
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}
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void DivPlatformFDS::tick() {
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for (int i=0; i<1; i++) {
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chan[i].std.next();
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if (chan[i].std.hadVol) {
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// ok, why are the volumes like that?
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chan[i].outVol=MIN(32,chan[i].std.vol)-(32-MIN(32,chan[i].vol));
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if (chan[i].outVol<0) chan[i].outVol=0;
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rWrite(0x4080,0x80|chan[i].outVol);
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}
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if (chan[i].std.hadArp) {
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if (i==3) { // noise
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if (chan[i].std.arpMode) {
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chan[i].baseFreq=chan[i].std.arp;
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} else {
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chan[i].baseFreq=chan[i].note+chan[i].std.arp;
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}
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if (chan[i].baseFreq>255) chan[i].baseFreq=255;
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if (chan[i].baseFreq<0) chan[i].baseFreq=0;
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} else {
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if (!chan[i].inPorta) {
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if (chan[i].std.arpMode) {
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chan[i].baseFreq=NOTE_FREQUENCY(chan[i].std.arp);
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} else {
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chan[i].baseFreq=NOTE_FREQUENCY(chan[i].note+chan[i].std.arp);
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}
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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=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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/*
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if (chan[i].std.hadDuty) {
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chan[i].duty=chan[i].std.duty;
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if (i==3) {
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if (parent->song.properNoiseLayout) {
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chan[i].duty&=1;
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} else if (chan[i].duty>1) {
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chan[i].duty=1;
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}
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}
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if (i!=2) {
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rWrite(0x4000+i*4,0x30|chan[i].outVol|((chan[i].duty&3)<<6));
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}
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if (i==3) { // noise
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chan[i].freqChanged=true;
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}
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}*/
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if (chan[i].std.hadWave) {
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if (chan[i].wave!=chan[i].std.wave) {
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chan[i].wave=chan[i].std.wave;
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updateWave();
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//if (!chan[i].keyOff) chan[i].keyOn=true;
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}
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}
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if (chan[i].sweepChanged) {
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chan[i].sweepChanged=false;
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if (i==0) {
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//rWrite(16+i*5,chan[i].sweep);
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}
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}
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if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
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chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false);
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if (chan[i].freq>4095) chan[i].freq=4095;
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if (chan[i].freq<0) chan[i].freq=0;
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if (chan[i].keyOn) {
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if (chan[i].wave<0) {
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chan[i].wave=0;
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updateWave();
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}
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}
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if (chan[i].keyOff) {
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rWrite(0x4080,0x80);
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}
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rWrite(0x4082,chan[i].freq&0xff);
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rWrite(0x4083,(chan[i].freq>>8)&15);
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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 DivPlatformFDS::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_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].std.init(parent->getIns(chan[c.chan].ins));
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rWrite(0x4080,0x80|chan[c.chan].vol);
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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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chan[c.chan].keyOff=true;
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chan[c.chan].std.init(NULL);
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break;
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case DIV_CMD_NOTE_OFF_ENV:
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case DIV_CMD_ENV_RELEASE:
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chan[c.chan].std.release();
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break;
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case DIV_CMD_INSTRUMENT:
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if (chan[c.chan].ins!=c.value || c.value2==1) {
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chan[c.chan].ins=c.value;
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}
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break;
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case DIV_CMD_VOLUME:
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if (chan[c.chan].vol!=c.value) {
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chan[c.chan].vol=c.value;
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if (!chan[c.chan].std.hasVol) {
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chan[c.chan].outVol=c.value;
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}
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rWrite(0x4080,0x80|chan[c.chan].vol);
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}
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break;
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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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case DIV_CMD_PITCH:
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chan[c.chan].pitch=c.value;
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chan[c.chan].freqChanged=true;
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break;
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case DIV_CMD_WAVE:
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if (chan[c.chan].wave!=c.value) {
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chan[c.chan].wave=c.value;
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updateWave();
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}
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break;
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case DIV_CMD_FDS_MOD_DEPTH:
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chan[c.chan].modDepth=c.value;
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rWrite(0x4084,(chan[c.chan].modOn<<7)|0x40|chan[c.chan].modDepth);
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break;
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case DIV_CMD_FDS_MOD_HIGH:
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chan[c.chan].modOn=c.value>>4;
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chan[c.chan].modFreq=((c.value&15)<<8)|(chan[c.chan].modFreq&0xff);
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rWrite(0x4084,(chan[c.chan].modOn<<7)|0x40|chan[c.chan].modDepth);
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rWrite(0x4087,chan[c.chan].modFreq>>8);
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break;
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case DIV_CMD_FDS_MOD_LOW:
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chan[c.chan].modFreq=(chan[c.chan].modFreq&0xf00)|c.value;
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rWrite(0x4086,chan[c.chan].modFreq&0xff);
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break;
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case DIV_CMD_FDS_MOD_POS:
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chan[c.chan].modPos=c.value&0x7f;
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// TODO
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break;
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case DIV_CMD_FDS_MOD_WAVE: {
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DivWavetable* wt=parent->getWave(c.value);
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for (int i=0; i<32; i++) {
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if (wt->max<1 || wt->len<1) {
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rWrite(0x4040+i,0);
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} else {
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int data=wt->data[i*MIN(32,wt->len)/32]*7/wt->max;
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if (data<0) data=0;
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if (data>7) data=7;
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chan[c.chan].modTable[i]=data;
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}
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}
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rWrite(0x4087,0x80|chan[c.chan].modFreq>>8);
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for (int i=0; i<32; i++) {
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rWrite(0x4088,chan[c.chan].modTable[i]);
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}
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rWrite(0x4087,chan[c.chan].modFreq>>8);
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break;
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}
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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_LEGATO:
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if (c.chan==3) break;
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chan[c.chan].baseFreq=NOTE_FREQUENCY(c.value+((chan[c.chan].std.willArp && !chan[c.chan].std.arpMode)?(chan[c.chan].std.arp):(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].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 32;
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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 DivPlatformFDS::muteChannel(int ch, bool mute) {
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isMuted[ch]=mute;
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}
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void DivPlatformFDS::forceIns() {
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for (int i=0; i<1; i++) {
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chan[i].insChanged=true;
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chan[i].prevFreq=65535;
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}
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updateWave();
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}
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void* DivPlatformFDS::getChanState(int ch) {
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return &chan[ch];
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}
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unsigned char* DivPlatformFDS::getRegisterPool() {
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return regPool;
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}
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int DivPlatformFDS::getRegisterPoolSize() {
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return 128;
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}
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void DivPlatformFDS::reset() {
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for (int i=0; i<1; i++) {
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chan[i]=DivPlatformFDS::Channel();
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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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fds_reset(fds);
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memset(regPool,0,128);
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rWrite(0x4023,0);
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rWrite(0x4023,0x83);
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rWrite(0x4089,0);
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}
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bool DivPlatformFDS::keyOffAffectsArp(int ch) {
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return true;
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}
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void DivPlatformFDS::setFlags(unsigned int flags) {
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if (flags==2) { // Dendy
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rate=COLOR_PAL*2.0/5.0;
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} else if (flags==1) { // PAL
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rate=COLOR_PAL*3.0/8.0;
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} else { // NTSC
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rate=COLOR_NTSC/2.0;
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}
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chipClock=rate;
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}
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void DivPlatformFDS::notifyInsDeletion(void* ins) {
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for (int i=0; i<5; i++) {
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chan[i].std.notifyInsDeletion((DivInstrument*)ins);
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}
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}
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void DivPlatformFDS::poke(unsigned int addr, unsigned short val) {
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rWrite(addr,val);
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}
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void DivPlatformFDS::poke(std::vector<DivRegWrite>& wlist) {
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for (DivRegWrite& i: wlist) rWrite(i.addr,i.val);
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}
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int DivPlatformFDS::init(DivEngine* p, int channels, int sugRate, unsigned int flags) {
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parent=p;
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apuType=flags;
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dumpWrites=false;
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skipRegisterWrites=false;
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fds=new struct _fds;
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for (int i=0; i<1; 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 5;
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}
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void DivPlatformFDS::quit() {
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delete fds;
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}
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DivPlatformFDS::~DivPlatformFDS() {
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}
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