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AY8930: Fix VGM output.

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It was generating writes to register addresses > 15.
This commit is contained in:
Laurens Holst 2022-05-02 19:38:17 +02:00
parent 66f6ab4307
commit ffa0727bf6
2 changed files with 19 additions and 11 deletions
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29
src/engine/platform/ay8930.cpp
View file

@ -25,7 +25,7 @@
#include <math.h>
#define rWrite(a,v) if (!skipRegisterWrites) {pendingWrites[a]=v;}
#define immWrite(a,v) if (!skipRegisterWrites) {writes.emplace(a,v); if (dumpWrites) {addWrite(a,v);} }
#define immWrite2(a,v) if (!skipRegisterWrites) {writes.emplace(a,v); if (dumpWrites) {addWrite(a,v);} }
#define CHIP_DIVIDER 8
@ -61,6 +61,18 @@ const char* regCheatSheetAY8930[]={
NULL
};
void DivPlatformAY8930::immWrite(unsigned char a, unsigned char v) {
if ((int)bank!=(a>>4)) {
bank=a>>4;
immWrite2(0x0d, 0xa0|(bank<<4)|ayEnvMode[0]);
}
if (a==0x0d) {
immWrite2(0x0d,0xa0|(bank<<4)|(v&15));
} else {
immWrite2(a&15,v);
}
}
const char** DivPlatformAY8930::getRegisterSheet() {
return regCheatSheetAY8930;
}
@ -123,18 +135,13 @@ void DivPlatformAY8930::acquire(short* bufL, short* bufR, size_t start, size_t l
}
while (!writes.empty()) {
QueuedWrite w=writes.front();
if ((int)bank!=(w.addr>>4)) {
bank=w.addr>>4;
ay->address_w(0x0d);
ay->data_w(0xa0|(bank<<4)|ayEnvMode[0]);
}
ay->address_w(w.addr&15);
if (w.addr==0x0d) {
ay->data_w(0xa0|(bank<<4)|(w.val&15));
ay->address_w(w.addr);
ay->data_w(w.val);
if (w.addr!=0x0d && (regPool[0x0d]&0xf0)==0xb0) {
regPool[(w.addr&0x0f)|0x10]=w.val;
} else {
ay->data_w(w.val);
regPool[w.addr&0x0f]=w.val;
}
regPool[w.addr&0x1f]=w.val;
writes.pop();
}
ay->sound_stream_update(ayBuf,len);

1
src/engine/platform/ay8930.h
View file

@ -73,6 +73,7 @@ class DivPlatformAY8930: public DivDispatch {
size_t ayBufLen;
void updateOutSel(bool immediate=false);
void immWrite(unsigned char a, unsigned char v);
friend void putDispatchChan(void*,int,int);