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https://github.com/tildearrow/furnace.git
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parent
4bf4be1ea2
commit
8dc143af7b
2 changed files with 47 additions and 26 deletions
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@ -21,15 +21,15 @@
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#include "../engine.h"
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#include <math.h>
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#define rWrite(a,v) {regPool[(a)]=(v)&0xff; if((a)==10) {chan.sreg=(v); chan.cnt=2;}}
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#define CHIP_DIVIDER 16
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#define SAMP_DIVIDER 4
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const char* regCheatSheet6522[]={
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"T2L", "08",
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"T2H", "09",
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"SR", "0A",
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"ACR", "0B",
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"PCR", "0C",
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NULL
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};
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@ -46,26 +46,45 @@ const char* DivPlatformPET::getEffectName(unsigned char effect) {
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return NULL;
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}
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// high-level emulation of 6522 shift register and driver software for now
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void DivPlatformPET::rWrite(unsigned int addr, unsigned char val) {
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bool hwSROutput=((regPool[11]>>2)&7)==4;
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switch (addr) {
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case 9:
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// simulate phase reset from switching between hw/sw shift registers
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if ((regPool[9]==0)^(val==0)) {
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chan.sreg=chan.wave;
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}
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break;
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case 10:
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chan.sreg=val;
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if (hwSROutput) chan.cnt=2;
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break;
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}
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regPool[addr]=val;
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}
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void DivPlatformPET::acquire(short* bufL, short* bufR, size_t start, size_t len) {
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// high-level emulation of 6522 shift register for now
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int t2=regPool[8]*2+4;
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if (((regPool[11]>>2)&7)==4) {
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bool hwSROutput=((regPool[11]>>2)&7)==4;
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if (chan.enable) {
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int reload=regPool[8]*2+4;
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if (!hwSROutput) {
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reload+=regPool[9]*512;
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}
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for (size_t h=start; h<start+len; h++) {
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int cycs=SAMP_DIVIDER;
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while (cycs>0) {
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int adv=MIN(cycs,chan.cnt);
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chan.cnt-=adv;
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cycs-=adv;
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if (chan.cnt==0) {
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chan.out=(chan.sreg&1)*32767;
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chan.sreg=(chan.sreg>>1)|((chan.sreg&1)<<7);
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chan.cnt=t2;
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}
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if (SAMP_DIVIDER>chan.cnt) {
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chan.out=(chan.sreg&1)*32767;
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chan.sreg=(chan.sreg>>1)|((chan.sreg&1)<<7);
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chan.cnt+=reload-SAMP_DIVIDER;
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} else {
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chan.cnt-=SAMP_DIVIDER;
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}
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bufL[h]=chan.out;
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bufR[h]=chan.out;
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oscBuf->data[oscBuf->needle++]=chan.out;
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}
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// emulate driver writes to PCR
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if (!hwSROutput) regPool[12]=chan.out?0xe0:0xc0;
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} else {
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chan.out=0;
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for (size_t h=start; h<start+len; h++) {
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@ -78,11 +97,10 @@ void DivPlatformPET::acquire(short* bufL, short* bufR, size_t start, size_t len)
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void DivPlatformPET::writeOutVol() {
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if (chan.active && !isMuted && chan.outVol>0) {
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if (regPool[11]!=16) {
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rWrite(11,16);
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rWrite(10,chan.wave);
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}
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chan.enable=true;
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rWrite(11,regPool[9]==0?16:0);
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} else {
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chan.enable=false;
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rWrite(11,0);
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}
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}
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@ -118,21 +136,22 @@ void DivPlatformPET::tick(bool sysTick) {
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chan.freqChanged=true;
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}
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if (chan.freqChanged || chan.keyOn || chan.keyOff) {
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chan.freq=parent->calcFreq(chan.baseFreq,chan.pitch,true,0,chan.pitch2,chipClock,CHIP_DIVIDER);
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if (chan.freq>257) chan.freq=257;
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if (chan.freq<2) chan.freq=2;
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rWrite(8,chan.freq-2);
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chan.freq=parent->calcFreq(chan.baseFreq,chan.pitch,true,0,chan.pitch2,chipClock,CHIP_DIVIDER)-2;
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if (chan.freq>65535) chan.freq=65535;
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if (chan.freq<0) chan.freq=0;
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rWrite(8,chan.freq&0xff);
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rWrite(9,chan.freq>>8);
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if (chan.keyOn) {
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if (!chan.std.vol.will) {
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chan.outVol=chan.vol;
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writeOutVol();
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}
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chan.keyOn=false;
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}
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if (chan.keyOff) {
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rWrite(11,0);
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chan.keyOff=false;
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}
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// update mode setting and channel enable
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writeOutVol();
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chan.freqChanged=false;
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}
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}
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@ -26,7 +26,7 @@
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class DivPlatformPET: public DivDispatch {
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struct Channel {
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int freq, baseFreq, pitch, pitch2, note, ins;
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bool active, insChanged, freqChanged, keyOn, keyOff, inPorta;
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bool active, insChanged, freqChanged, keyOn, keyOff, inPorta, enable;
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int vol, outVol, wave;
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unsigned char sreg;
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int cnt;
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@ -49,6 +49,7 @@ class DivPlatformPET: public DivDispatch {
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keyOn(false),
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keyOff(false),
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inPorta(false),
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enable(false),
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vol(1),
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outVol(1),
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wave(0b00001111),
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@ -85,6 +86,7 @@ class DivPlatformPET: public DivDispatch {
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~DivPlatformPET();
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private:
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void writeOutVol();
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void rWrite(unsigned int addr, unsigned char val);
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};
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#endif
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