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SMS: fix noise pitch being odd on linear pitch off

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issue #379
This commit is contained in:
tildearrow 2022-04-19 18:10:43 -05:00
parent 7767881ca7
commit b6026e76c5
1 changed files with 5 additions and 4 deletions
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9
src/engine/platform/sms.cpp
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@ -23,8 +23,6 @@
#define rWrite(v) {if (!skipRegisterWrites) {sn->write(v); if (dumpWrites) {addWrite(0x200,v);}}} #define rWrite(v) {if (!skipRegisterWrites) {sn->write(v); if (dumpWrites) {addWrite(0x200,v);}}}
#define CHIP_DIVIDER 64
const char* regCheatSheetSN[]={ const char* regCheatSheetSN[]={
"DATA", "0", "DATA", "0",
NULL NULL
@ -55,6 +53,8 @@ int DivPlatformSMS::acquireOne() {
void DivPlatformSMS::tick(bool sysTick) { void DivPlatformSMS::tick(bool sysTick) {
for (int i=0; i<4; i++) { for (int i=0; i<4; i++) {
int CHIP_DIVIDER=64;
if (i==3 && isRealSN) CHIP_DIVIDER=60;
chan[i].std.next(); chan[i].std.next();
if (chan[i].std.vol.had) { if (chan[i].std.vol.had) {
chan[i].outVol=MIN(15,chan[i].std.vol.val)-(15-(chan[i].vol&15)); chan[i].outVol=MIN(15,chan[i].std.vol.val)-(15-(chan[i].vol&15));
@ -119,8 +119,7 @@ void DivPlatformSMS::tick(bool sysTick) {
} }
} }
if (chan[3].freqChanged || updateSNMode) { if (chan[3].freqChanged || updateSNMode) {
// seems arbitrary huh? chan[3].freq=parent->calcFreq(chan[3].baseFreq,chan[3].pitch,true)+chan[3].std.pitch.val;
chan[3].freq=parent->calcFreq(chan[3].baseFreq,chan[3].pitch-1-(isRealSN?127:0),true)+chan[3].std.pitch.val;
if (chan[3].freq>1023) chan[3].freq=1023; if (chan[3].freq>1023) chan[3].freq=1023;
if (chan[3].actualNote>0x5d) chan[3].freq=0x01; if (chan[3].actualNote>0x5d) chan[3].freq=0x01;
if (snNoiseMode&2) { // take period from channel 3 if (snNoiseMode&2) { // take period from channel 3
@ -164,6 +163,8 @@ void DivPlatformSMS::tick(bool sysTick) {
} }
int DivPlatformSMS::dispatch(DivCommand c) { int DivPlatformSMS::dispatch(DivCommand c) {
int CHIP_DIVIDER=64;
if (c.chan==3 && isRealSN) CHIP_DIVIDER=60;
switch (c.cmd) { switch (c.cmd) {
case DIV_CMD_NOTE_ON: case DIV_CMD_NOTE_ON:
if (c.value!=DIV_NOTE_NULL) { if (c.value!=DIV_NOTE_NULL) {