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SN76496.cpp/h: add stereo capability

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This commit is contained in:
dinkc64 2015-03-01 15:04:16 +00:00
parent 2d3b187aa0
commit d2f681b6d0
2 changed files with 49 additions and 5 deletions
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51
src/burn/snd/sn76496.cpp
View File

@ -25,6 +25,7 @@ struct SN76496
INT32 Output[4];
INT32 bSignalAdd;
double nVolume;
INT32 StereoMask; /* the stereo output mask */
INT32 nOutputDir;
};
@ -67,7 +68,7 @@ void SN76496Update(INT32 Num, INT16* pSoundBuf, INT32 Length)
while (Length > 0)
{
INT32 Vol[4];
UINT32 Out;
UINT32 Out, Out2;
INT32 Left;
@ -149,8 +150,26 @@ void SN76496Update(INT32 Num, INT16* pSoundBuf, INT32 Length)
Left -= NextEvent;
} while (Left > 0);
Out = Vol[0] * R->Volume[0] + Vol[1] * R->Volume[1] +
Vol[2] * R->Volume[2] + Vol[3] * R->Volume[3];
if (R->StereoMask != 0xFF)
{
Out = ((R->StereoMask&0x10) ? Vol[0] * R->Volume[0]:0)
+ ((R->StereoMask&0x20) ? Vol[1] * R->Volume[1]:0)
+ ((R->StereoMask&0x40) ? Vol[2] * R->Volume[2]:0)
+ ((R->StereoMask&0x80) ? Vol[3] * R->Volume[3]:0);
Out2 = ((R->StereoMask&0x1) ? Vol[0] * R->Volume[0]:0)
+ ((R->StereoMask&0x2) ? Vol[1] * R->Volume[1]:0)
+ ((R->StereoMask&0x4) ? Vol[2] * R->Volume[2]:0)
+ ((R->StereoMask&0x8) ? Vol[3] * R->Volume[3]:0);
if (Out2 > MAX_OUTPUT * STEP) Out2 = MAX_OUTPUT * STEP;
Out2 /= STEP;
}
else
{
Out = Vol[0] * R->Volume[0] + Vol[1] * R->Volume[1] +
Vol[2] * R->Volume[2] + Vol[3] * R->Volume[3];
}
if (Out > MAX_OUTPUT * STEP) Out = MAX_OUTPUT * STEP;
@ -161,7 +180,10 @@ void SN76496Update(INT32 Num, INT16* pSoundBuf, INT32 Length)
nLeftSample += (INT32)(Out * R->nVolume);
}
if ((R->nOutputDir & BURN_SND_ROUTE_RIGHT) == BURN_SND_ROUTE_RIGHT) {
nRightSample += (INT32)(Out * R->nVolume);
if (R->StereoMask != 0xFF)
nRightSample += (INT32)(Out2 * R->nVolume);
else
nRightSample += (INT32)(Out * R->nVolume);
}
if (R->bSignalAdd) {
@ -302,6 +324,26 @@ void SN76496UpdateToBuffer(INT32 Num, INT16* pSoundBuf, INT32 Length)
}
}
void SN76496StereoWrite(INT32 Num, INT32 Data)
{
#if defined FBA_DEBUG
if (!DebugSnd_SN76496Initted) bprintf(PRINT_ERROR, _T("SN76496StereoWrite called without init\n"));
if (Num > NumChips) bprintf(PRINT_ERROR, _T("SN76496StereoWrite called with invalid chip %x\n"), Num);
#endif
struct SN76496 *R = Chip0;
if (Num >= MAX_SN76496_CHIPS) return;
if (Num == 1) R = Chip1;
if (Num == 2) R = Chip2;
if (Num == 3) R = Chip3;
if (Num == 4) R = Chip4;
R->StereoMask = Data;
bprintf(0, _T("sw[%X]"), Data);
}
void SN76496Write(INT32 Num, INT32 Data)
{
#if defined FBA_DEBUG
@ -413,6 +455,7 @@ static void SN76496Init(struct SN76496 *R, INT32 Clock)
R->FeedbackMask = 0x4000;
R->WhitenoiseTaps = 0x03;
R->WhitenoiseInvert = 1;
R->StereoMask = 0xFF;
R->RNG = R->FeedbackMask;
R->Output[3] = R->RNG & 1;

1
src/burn/snd/sn76496.h
View File

@ -1,6 +1,7 @@
void SN76496Update(INT32 Num, INT16* pSoundBuf, INT32 Length);
void SN76496UpdateToBuffer(INT32 Num, INT16* pSoundBuf, INT32 Length); // output mono
void SN76496Write(INT32 Num, INT32 Data);
void SN76496StereoWrite(INT32 Num, INT32 Data);
void SN76489Init(INT32 Num, INT32 Clock, INT32 SignalAdd);
void SN76489AInit(INT32 Num, INT32 Clock, INT32 SignalAdd);
void SN76494Init(INT32 Num, INT32 Clock, INT32 SignalAdd);