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d_spectrum: perfect ay-dac at any soundrate

This commit is contained in:
dinkc64 2018-06-08 03:48:36 +00:00
parent 410837a070
commit e925513e19
1 changed files with 30 additions and 4 deletions
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34
src/burn/drv/pre90s/d_spectrum.cpp
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@ -81,6 +81,9 @@ static UINT8 nPortFEData = 0;
static INT32 DrvIsSpec128 = 0;
static INT32 nPort7FFDData = -1;
static INT32 ay_table[312];
static INT32 ay_table_initted = 0;
static void spectrum_UpdateScreenBitmap(bool);
static void spectrum_UpdateBorderBitmap();
static void spectrum_128_update_memory();
@ -728,7 +731,9 @@ static INT32 DrvDoReset()
if (nActiveSnapshotType == SPEC_SNAPSHOT_SNA) DrvLoadSNASnapshot();
if (nActiveSnapshotType == SPEC_SNAPSHOT_Z80) DrvLoadZ80Snapshot();
ay_table_initted = 0;
return 0;
}
@ -1322,6 +1327,26 @@ static void spectrum_UpdateBorderBitmap()
while (!((nPreviousBorderX == x) && (nPreviousBorderY == y)));
}
static void DrvMakeAYUpdateTable()
{ // sample update table for ay-dac at any soundrate, must be called in DrvFrame()!
if (ay_table_initted) return;
if (DrvNumScanlines > 312) {
bprintf(PRINT_ERROR, _T(" !!! make_ay_updatetable(): uhoh, ay_table[] too small!\n"));
return;
}
INT32 p = 0;
memset(&ay_table, 0, sizeof(ay_table));
for (INT32 i = 0; i < 312; i++) {
ay_table[i] = ((i * nBurnSoundLen) / 312) - p;
p = (i * nBurnSoundLen) / 312;
}
ay_table_initted = 1;
}
static INT32 DrvFrame()
{
if (DrvReset) DrvDoReset();
@ -1332,6 +1357,7 @@ static INT32 DrvFrame()
nCyclesDone = 0;
INT32 nSoundBufferPos = 0;
DrvMakeAYUpdateTable(); // _must_ be called in-frame since nBurnSoundLen is pre-calculated @ 60hz in DrvDoReset() @ init.
ZetNewFrame();
ZetOpen(0);
@ -1360,9 +1386,9 @@ static INT32 DrvFrame()
}
spectrum_UpdateScreenBitmap(false);
if (DrvIsSpec128 && pBurnSoundOut && (nScanline & 1)) {
INT32 nSegmentLength = nBurnSoundLen / (DrvNumScanlines / 2);
if (DrvIsSpec128 && pBurnSoundOut) {
INT32 nSegmentLength = ay_table[nScanline];
INT16* pSoundBuf = pBurnSoundOut + (nSoundBufferPos << 1);
AY8910Render(pSoundBuf, nSegmentLength);
nSoundBufferPos += nSegmentLength;