Add VERA support for Commander X16
This commit is contained in:
Natt Akuma
parent
98e2c51592
commit
9abf872ff3
13 changed files with 565 additions and 13 deletions
404
src/engine/platform/vera.cpp
Normal file
404
src/engine/platform/vera.cpp
Normal file
|
|
@ -0,0 +1,404 @@
|
|||
/**
|
||||
* Furnace Tracker - multi-system chiptune tracker
|
||||
* Copyright (C) 2021-2022 tildearrow and contributors
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License along
|
||||
* with this program; if not, write to the Free Software Foundation, Inc.,
|
||||
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
||||
*/
|
||||
|
||||
#include "vera.h"
|
||||
#include "../engine.h"
|
||||
#include <string.h>
|
||||
#include <math.h>
|
||||
|
||||
#define rWrite(c,a,d) {regPool[(c)*4+(a)]=(d);}
|
||||
#define rWriteLo(c,a,d) rWrite(c,a,(regPool[(c)*4+(a)]&(~0x3f))|((d)&0x3f))
|
||||
#define rWriteHi(c,a,d) rWrite(c,a,(regPool[(c)*4+(a)]&(~0xc0))|(((d)<<6)&0xc0))
|
||||
#define rWriteFIFOVol(d) rWrite(16,0,(regPool[64]&(~0x3f))|((d)&0x3f))
|
||||
|
||||
const char* regCheatSheetVERA[]={
|
||||
"CHxFreq", "00+x*4",
|
||||
"CHxVol", "02+x*4",
|
||||
"CHxWave", "03+x*4",
|
||||
|
||||
"AUDIO_CTRL", "40",
|
||||
"AUDIO_RATE", "41",
|
||||
|
||||
NULL
|
||||
};
|
||||
|
||||
const char** DivPlatformVERA::getRegisterSheet() {
|
||||
return regCheatSheetVERA;
|
||||
}
|
||||
|
||||
const char* DivPlatformVERA::getEffectName(unsigned char effect) {
|
||||
switch (effect) {
|
||||
case 0x20:
|
||||
return "20xx: Change waveform";
|
||||
break;
|
||||
case 0x22:
|
||||
return "22xx: Set duty cycle (0 to 63)";
|
||||
break;
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
void DivPlatformVERA::acquire(short* bufL, short* bufR, size_t start, size_t len) {
|
||||
// taken from the official X16 emulator's source code, (c) 2020 Frank van den Hoef
|
||||
const uint8_t volume_lut_psg[64]={0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 6, 6, 7, 7, 7, 8, 8, 9, 9, 10, 11, 11, 12, 13, 14, 14, 15, 16, 17, 18, 19, 21, 22, 23, 25, 26, 28, 29, 31, 33, 35, 37, 39, 42, 44, 47, 50, 52, 56, 59, 63};
|
||||
const uint8_t volume_lut_pcm[16]={0, 1, 2, 3, 4, 5, 6, 8, 11, 14, 18, 23, 30, 38, 49, 64};
|
||||
for (size_t pos=start; pos<start+len; pos++) {
|
||||
int32_t lout=0;
|
||||
int32_t rout=0;
|
||||
// PSG
|
||||
for (int i=0; i<16; i++) {
|
||||
unsigned freq=regPool[i*4+0] | (regPool[i*4+1] << 8);
|
||||
unsigned old_accum=chan[i].accum;
|
||||
unsigned new_accum=old_accum+freq;
|
||||
int val=0x20;
|
||||
// TODO actually emulate the LFSR, it's currently unknown publicly
|
||||
// and the official emulator just uses this:
|
||||
if ((old_accum^new_accum)&0x10000) chan[i].noiseval=rand()&63;
|
||||
new_accum&=0x1ffff;
|
||||
chan[i].accum=new_accum;
|
||||
switch (regPool[i*4+3]>>6) {
|
||||
case 0: val=(new_accum>>10)>(regPool[i*4+3]&(unsigned)0x3f)?0:63; break;
|
||||
case 1: val=(new_accum>>11); break;
|
||||
case 2: val=(new_accum&0x10000)?(~(new_accum>>10)&0x3f):((new_accum>>10)&0x3f); break;
|
||||
case 3: val=chan[i].noiseval; break;
|
||||
}
|
||||
val=(val-0x20)*volume_lut_psg[regPool[i*4+2]&0x3f];
|
||||
lout+=(regPool[i*4+2]&0x40)?val:0;
|
||||
rout+=(regPool[i*4+2]&0x80)?val:0;
|
||||
}
|
||||
// PCM
|
||||
// simple one-channel sample player, actual hardware is essentially a DAC
|
||||
// with buffering
|
||||
if (chan[16].pcm.sample>=0) {
|
||||
chan[16].accum+=regPool[65];
|
||||
if (chan[16].accum>=128) {
|
||||
DivSample* s=parent->getSample(chan[16].pcm.sample);
|
||||
if (s->samples>0) {
|
||||
// TODO stereo samples once DivSample has a support for it
|
||||
switch (s->depth) {
|
||||
case 8:
|
||||
chan[16].pcm.out_l=chan[16].pcm.pan&1?(s->data8[chan[16].pcm.pos]*256):0;
|
||||
chan[16].pcm.out_r=chan[16].pcm.pan&2?(s->data8[chan[16].pcm.pos]*256):0;
|
||||
regPool[64]|=0x20; // for register viewer purposes
|
||||
break;
|
||||
case 16:
|
||||
chan[16].pcm.out_l=chan[16].pcm.pan&1?(s->data16[chan[16].pcm.pos]):0;
|
||||
chan[16].pcm.out_r=chan[16].pcm.pan&2?(s->data16[chan[16].pcm.pos]):0;
|
||||
regPool[64]&=~0x20;
|
||||
break;
|
||||
}
|
||||
} else {
|
||||
chan[16].pcm.sample=-1;
|
||||
}
|
||||
chan[16].accum&=0x7f;
|
||||
chan[16].pcm.pos++;
|
||||
if (chan[16].pcm.pos>=s->samples) {
|
||||
if (s->loopStart>=0 && s->loopStart<=(int)s->samples) {
|
||||
chan[16].pcm.pos=s->loopStart;
|
||||
} else {
|
||||
chan[16].pcm.sample=-1;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
int pcmvol=volume_lut_pcm[regPool[64]&0x0f];
|
||||
lout+=chan[16].pcm.out_l*pcmvol/64;
|
||||
rout+=chan[16].pcm.out_r*pcmvol/64;
|
||||
|
||||
bufL[pos]=(short)(lout/2);
|
||||
bufR[pos]=(short)(rout/2);
|
||||
}
|
||||
}
|
||||
|
||||
void DivPlatformVERA::reset() {
|
||||
for (int i=0; i<17; i++) {
|
||||
chan[i]=Channel();
|
||||
}
|
||||
memset(regPool,0,66);
|
||||
for (int i=0; i<16; i++) {
|
||||
chan[i].vol=63;
|
||||
rWriteHi(i,2,3); // default pan
|
||||
}
|
||||
chan[16].vol=15;
|
||||
}
|
||||
|
||||
int DivPlatformVERA::calcNoteFreq(int ch, int note) {
|
||||
if (ch<16) {
|
||||
return parent->calcBaseFreq(chipClock,2097152,note,false);
|
||||
} else {
|
||||
double off=1.0;
|
||||
if (chan[ch].pcm.sample>=0 && chan[ch].pcm.sample<parent->song.sampleLen) {
|
||||
DivSample* s=parent->getSample(chan[ch].pcm.sample);
|
||||
if (s->centerRate<1) {
|
||||
off=1.0;
|
||||
} else {
|
||||
off=s->centerRate/8363.0;
|
||||
}
|
||||
}
|
||||
return (int)(off*parent->calcBaseFreq(chipClock,65536,note,false));
|
||||
}
|
||||
}
|
||||
|
||||
void DivPlatformVERA::tick() {
|
||||
for (int i=0; i<17; i++) {
|
||||
chan[i].std.next();
|
||||
if (chan[i].std.hadVol) {
|
||||
if (i<16) {
|
||||
chan[i].outVol=MAX(chan[i].vol+chan[i].std.vol-63,0);
|
||||
rWriteLo(i,2,isMuted[i]?0:(chan[i].outVol&63));
|
||||
} else {
|
||||
// NB this is currently assuming Amiga instrument type with a 0-64
|
||||
// (inclusive) volume range. This envelope is then scaled and added to
|
||||
// the channel volume. Is this a better way to handle this instead of
|
||||
// making another identical Amiga instrument type but with a 0-15
|
||||
// volume range?
|
||||
chan[16].outVol=MAX(chan[16].vol+MIN(chan[16].std.vol/4,15)-15,0);
|
||||
rWriteFIFOVol(isMuted[16]?0:(chan[16].outVol&15));
|
||||
}
|
||||
}
|
||||
if (chan[i].std.hadArp) {
|
||||
if (!chan[i].inPorta) {
|
||||
if (chan[i].std.arpMode) {
|
||||
chan[i].baseFreq=calcNoteFreq(0,chan[i].std.arp);
|
||||
} else {
|
||||
chan[i].baseFreq=calcNoteFreq(0,chan[i].note+chan[i].std.arp);
|
||||
}
|
||||
}
|
||||
chan[i].freqChanged=true;
|
||||
} else {
|
||||
if (chan[i].std.arpMode && chan[i].std.finishedArp) {
|
||||
chan[i].baseFreq=calcNoteFreq(0,chan[i].note);
|
||||
chan[i].freqChanged=true;
|
||||
}
|
||||
}
|
||||
if (chan[i].std.hadDuty && i<16) {
|
||||
rWriteLo(i,3,chan[i].std.duty);
|
||||
}
|
||||
if (chan[i].std.hadWave && i<16) {
|
||||
rWriteHi(i,3,chan[i].std.wave);
|
||||
}
|
||||
if (chan[i].freqChanged) {
|
||||
chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,8);
|
||||
if (i<16) {
|
||||
if (chan[i].freq>65535) chan[i].freq=65535;
|
||||
rWrite(i,0,chan[i].freq&0xff);
|
||||
rWrite(i,1,(chan[i].freq>>8)&0xff);
|
||||
} else {
|
||||
if (chan[i].freq>128) chan[i].freq=128;
|
||||
rWrite(16,1,chan[i].freq&0xff);
|
||||
}
|
||||
chan[i].freqChanged=false;
|
||||
}
|
||||
}
|
||||
// PCM
|
||||
chan[16].std.next();
|
||||
if (chan[16].std.hadVol) {
|
||||
}
|
||||
if (chan[16].std.hadArp) {
|
||||
if (!chan[16].inPorta) {
|
||||
if (chan[16].std.arpMode) {
|
||||
chan[16].baseFreq=calcNoteFreq(16,chan[16].std.arp);
|
||||
} else {
|
||||
chan[16].baseFreq=calcNoteFreq(16,chan[16].note+chan[16].std.arp);
|
||||
}
|
||||
}
|
||||
chan[16].freqChanged=true;
|
||||
} else {
|
||||
if (chan[16].std.arpMode && chan[16].std.finishedArp) {
|
||||
chan[16].baseFreq=calcNoteFreq(16,chan[16].note);
|
||||
chan[16].freqChanged=true;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
int DivPlatformVERA::dispatch(DivCommand c) {
|
||||
int tmp;
|
||||
switch (c.cmd) {
|
||||
case DIV_CMD_NOTE_ON:
|
||||
tmp = isMuted[c.chan]?0:chan[c.chan].vol;
|
||||
if(c.chan<16) {
|
||||
rWriteLo(c.chan,2,tmp)
|
||||
} else {
|
||||
chan[c.chan].pcm.sample=parent->getIns(chan[16].ins)->amiga.initSample;
|
||||
if (chan[c.chan].pcm.sample<0 || chan[c.chan].pcm.sample>=parent->song.sampleLen) {
|
||||
chan[c.chan].pcm.sample=-1;
|
||||
}
|
||||
chan[16].pcm.pos=0;
|
||||
rWriteFIFOVol(tmp);
|
||||
}
|
||||
if (c.value!=DIV_NOTE_NULL) {
|
||||
chan[c.chan].baseFreq=calcNoteFreq(c.chan,c.value);
|
||||
chan[c.chan].freqChanged=true;
|
||||
chan[c.chan].note=c.value;
|
||||
}
|
||||
chan[c.chan].active=true;
|
||||
chan[c.chan].std.init(parent->getIns(chan[c.chan].ins));
|
||||
break;
|
||||
case DIV_CMD_NOTE_OFF:
|
||||
chan[c.chan].active=false;
|
||||
if(c.chan<16) {
|
||||
rWriteLo(c.chan,2,0)
|
||||
} else {
|
||||
chan[16].pcm.sample=-1;
|
||||
rWriteFIFOVol(0);
|
||||
rWrite(16,1,0);
|
||||
}
|
||||
chan[c.chan].std.init(NULL);
|
||||
break;
|
||||
case DIV_CMD_NOTE_OFF_ENV:
|
||||
case DIV_CMD_ENV_RELEASE:
|
||||
chan[c.chan].std.release();
|
||||
break;
|
||||
case DIV_CMD_INSTRUMENT:
|
||||
chan[c.chan].ins=(unsigned char)c.value;
|
||||
break;
|
||||
case DIV_CMD_VOLUME:
|
||||
if (c.chan<16) {
|
||||
tmp=c.value&0x3f;
|
||||
chan[c.chan].vol=tmp;
|
||||
rWriteLo(c.chan,2,(isMuted[c.chan]?0:tmp));
|
||||
} else {
|
||||
tmp=c.value&0x0f;
|
||||
chan[c.chan].vol=tmp;
|
||||
rWriteFIFOVol(isMuted[c.chan]?0:tmp);
|
||||
}
|
||||
break;
|
||||
case DIV_CMD_GET_VOLUME:
|
||||
return chan[c.chan].vol;
|
||||
break;
|
||||
case DIV_CMD_PITCH:
|
||||
chan[c.chan].pitch=c.value;
|
||||
chan[c.chan].freqChanged=true;
|
||||
break;
|
||||
case DIV_CMD_NOTE_PORTA: {
|
||||
int destFreq=calcNoteFreq(c.chan,c.value2);
|
||||
bool return2=false;
|
||||
if (destFreq>chan[c.chan].baseFreq) {
|
||||
chan[c.chan].baseFreq+=c.value;
|
||||
if (chan[c.chan].baseFreq>=destFreq) {
|
||||
chan[c.chan].baseFreq=destFreq;
|
||||
return2=true;
|
||||
}
|
||||
} else {
|
||||
chan[c.chan].baseFreq-=c.value;
|
||||
if (chan[c.chan].baseFreq<=destFreq) {
|
||||
chan[c.chan].baseFreq=destFreq;
|
||||
return2=true;
|
||||
}
|
||||
}
|
||||
chan[c.chan].freqChanged=true;
|
||||
if (return2) {
|
||||
chan[c.chan].inPorta=false;
|
||||
return 2;
|
||||
}
|
||||
break;
|
||||
}
|
||||
case DIV_CMD_LEGATO:
|
||||
chan[c.chan].baseFreq=calcNoteFreq(c.chan,c.value+((chan[c.chan].std.willArp && !chan[c.chan].std.arpMode)?(chan[c.chan].std.arp):(0)));
|
||||
chan[c.chan].freqChanged=true;
|
||||
chan[c.chan].note=c.value;
|
||||
break;
|
||||
case DIV_CMD_PRE_PORTA:
|
||||
if (chan[c.chan].active && c.value2) {
|
||||
if (parent->song.resetMacroOnPorta) chan[c.chan].std.init(parent->getIns(chan[c.chan].ins));
|
||||
}
|
||||
chan[c.chan].inPorta=c.value;
|
||||
break;
|
||||
case DIV_CMD_STD_NOISE_MODE:
|
||||
if (c.chan<16) rWriteLo(c.chan,3,c.value);
|
||||
break;
|
||||
case DIV_CMD_WAVE:
|
||||
if (c.chan<16) rWriteHi(c.chan,3,c.value);
|
||||
break;
|
||||
case DIV_CMD_PANNING: {
|
||||
tmp=0;
|
||||
tmp|=(c.value&0x10)?1:0;
|
||||
tmp|=(c.value&0x01)?2:0;
|
||||
if (c.chan<16) {
|
||||
rWriteHi(c.chan,2,tmp);
|
||||
} else {
|
||||
chan[c.chan].pcm.pan = tmp&3;
|
||||
}
|
||||
break;
|
||||
}
|
||||
case DIV_CMD_GET_VOLMAX:
|
||||
if(c.chan<16) {
|
||||
return 63;
|
||||
} else {
|
||||
return 15;
|
||||
}
|
||||
break;
|
||||
case DIV_ALWAYS_SET_VOLUME:
|
||||
return 0;
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
void* DivPlatformVERA::getChanState(int ch) {
|
||||
return &chan[ch];
|
||||
}
|
||||
|
||||
unsigned char* DivPlatformVERA::getRegisterPool() {
|
||||
return regPool;
|
||||
}
|
||||
|
||||
int DivPlatformVERA::getRegisterPoolSize() {
|
||||
return 66;
|
||||
}
|
||||
|
||||
void DivPlatformVERA::muteChannel(int ch, bool mute) {
|
||||
isMuted[ch]=mute;
|
||||
}
|
||||
|
||||
bool DivPlatformVERA::isStereo() {
|
||||
return true;
|
||||
}
|
||||
|
||||
void DivPlatformVERA::notifyInsDeletion(void* ins) {
|
||||
for (int i=0; i<2; i++) {
|
||||
chan[i].std.notifyInsDeletion((DivInstrument*)ins);
|
||||
}
|
||||
}
|
||||
|
||||
void DivPlatformVERA::poke(unsigned int addr, unsigned short val) {
|
||||
regPool[addr] = (unsigned char)val;
|
||||
}
|
||||
|
||||
void DivPlatformVERA::poke(std::vector<DivRegWrite>& wlist) {
|
||||
for (auto &i: wlist) regPool[i.addr] = (unsigned char)i.val;
|
||||
}
|
||||
|
||||
int DivPlatformVERA::init(DivEngine* p, int channels, int sugRate, unsigned int flags) {
|
||||
for (int i=0; i<17; i++) {
|
||||
isMuted[i]=false;
|
||||
}
|
||||
parent=p;
|
||||
dumpWrites=false;
|
||||
skipRegisterWrites=false;
|
||||
chipClock=25000000;
|
||||
rate=chipClock/512;
|
||||
reset();
|
||||
return 17;
|
||||
}
|
||||
|
||||
DivPlatformVERA::~DivPlatformVERA() {
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue