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potentially breaking change: better freq formula

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now using a 4096-entry-long table for calculating final period/frequency
see issue #303
This commit is contained in:
tildearrow 2022-03-25 02:52:41 -05:00
parent 03da02711a
commit ed857b20c4
3 changed files with 22 additions and 5 deletions
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13
src/engine/platform/vic20.cpp
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@ -22,10 +22,12 @@
#include <math.h>
#define rWrite(a,v) {regPool[(a)]=(v)&0xff; vic_sound_machine_store(vic,a,(v)&0xff);}
#define CHIP_DIVIDER 32
#define SAMP_DIVIDER 4
const int chipDividers[4]={
128, 64, 32, 64
};
const char* regCheatSheetVIC[]={
"CH1_Pitch", "0A",
"CH2_Pitch", "0B",
@ -93,6 +95,7 @@ void DivPlatformVIC20::writeOutVol(int ch) {
void DivPlatformVIC20::tick() {
for (int i=0; i<4; i++) {
int CHIP_DIVIDER=chipDividers[i];
chan[i].std.next();
if (chan[i].std.hadVol) {
int env=chan[i].std.vol;
@ -121,10 +124,9 @@ void DivPlatformVIC20::tick() {
}
if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true);
if (i<3) chan[i].freq>>=(2-i);
else chan[i].freq>>=1;
printf("%d freq: %d\n",i,chan[i].freq);
if (chan[i].freq<1) chan[i].freq=1;
if (chan[i].freq>127) chan[i].freq=0;
if (chan[i].freq>127) chan[i].freq=127;
if (isMuted[i]) chan[i].keyOn=false;
if (chan[i].keyOn) {
if (i<3) {
@ -150,6 +152,7 @@ void DivPlatformVIC20::tick() {
}
int DivPlatformVIC20::dispatch(DivCommand c) {
int CHIP_DIVIDER=chipDividers[c.chan];
switch (c.cmd) {
case DIV_CMD_NOTE_ON: {
DivInstrument* ins=parent->getIns(chan[c.chan].ins);