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Fix incorrect masking of register writes on ay-3-8914, fixes wrong envelope amplitude on games which use hardware enveloping on Intellivision (Thunder Castle, etc) [Huygens]

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This commit is contained in:
Jonathan Gevaryahu 2011-10-05 09:15:29 +00:00
parent e7b2968892
commit c9eae4329c
1 changed files with 3 additions and 5 deletions
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8
src/emu/sound/ay8910.c
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@ -142,7 +142,7 @@ has twice the steps, happening twice as fast.
#define TONE_PERIOD(_psg, _chan) ( (_psg)->regs[(_chan) << 1] | (((_psg)->regs[((_chan) << 1) | 1] & 0x0f) << 8) )
#define NOISE_PERIOD(_psg) ( (_psg)->regs[AY_NOISEPER] & 0x1f)
#define TONE_VOLUME(_psg, _chan) ( (_psg)->regs[AY_AVOL + (_chan)] & 0x0f)
#define TONE_ENVELOPE(_psg, _chan) (((_psg)->regs[AY_AVOL + (_chan)] >> 4) & (_psg)->env_enabled_mask)
#define TONE_ENVELOPE(_psg, _chan) (((_psg)->regs[AY_AVOL + (_chan)] >> 4) & (((_psg)->device->type() == AY8914) ? 3 : 1))
#define ENVELOPE_PERIOD(_psg) (((_psg)->regs[AY_EFINE] | ((_psg)->regs[AY_ECOARSE]<<8)))
/*************************************
@ -184,7 +184,6 @@ struct _ay8910_context
/* init parameters ... */
int step;
int zero_is_off;
int env_enabled_mask;
UINT8 vol_enabled[NUM_CHANNELS];
const ay_ym_param *par;
const ay_ym_param *par_env;
@ -438,7 +437,7 @@ INLINE UINT16 mix_3D(ay8910_context *psg)
int indx = 0, chan;
for (chan = 0; chan < NUM_CHANNELS; chan++)
if (TONE_ENVELOPE(psg, chan))
if (TONE_ENVELOPE(psg, chan) != 0)
{
if (psg->device->type() == AY8914) // AY8914 Has a two bit tone_envelope field
{
@ -665,7 +664,7 @@ static STREAM_UPDATE( ay8910_update )
if (psg->streams == 3)
{
for (chan = 0; chan < NUM_CHANNELS; chan++)
if (TONE_ENVELOPE(psg,chan))
if (TONE_ENVELOPE(psg,chan) != 0)
{
if (psg->device->type() == AY8914) // AY8914 Has a two bit tone_envelope field
{
@ -770,7 +769,6 @@ void *ay8910_start_ym(void *infoptr, device_type chip_type, device_t *device, in
else
info->streams = 3;
info->env_enabled_mask = (chip_type == AY8914) ? 3 : 1; // AY8914 Has a two bit tone_envelope field
if (chip_type == AY8910 || chip_type == AY8914 || chip_type == AY8930)
{