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Backport OPL2 KSL table fix from MAME v0.150.

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nukeykt 2016-02-18 15:13:46 +09:00 committed by Christoph Oelckers
parent 92697659be
commit 4b0aac9816
1 changed files with 5 additions and 2 deletions
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7
src/oplsynth/fmopl.cpp
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@ -323,6 +323,10 @@ static const UINT32 ksl_tab[8*16]=
};
#undef DV
/* 0 / 3.0 / 1.5 / 6.0 dB/OCT */
static const UINT32 ksl_shift[4] = { 31, 1, 2, 0 };
/* sustain level table (3dB per step) */
/* 0 - 15: 0, 3, 6, 9,12,15,18,21,24,27,30,33,36,39,42,93 (dB)*/
#define SC(db) (UINT32) ( db * (2.0/ENV_STEP) )
@ -1271,9 +1275,8 @@ void set_ksl_tl(FM_OPL *OPL,int slot,int v)
{
OPL_CH *CH = &OPL->P_CH[slot/2];
OPL_SLOT *SLOT = &CH->SLOT[slot&1];
int ksl = v>>6; /* 0 / 1.5 / 3.0 / 6.0 dB/OCT */
SLOT->ksl = ksl ? 3-ksl : 31;
SLOT->ksl = ksl_shift[v >> 6];
SLOT->TL = (v&0x3f)<<(ENV_BITS-1-7); /* 7 bits TL (bit 6 = always 0) */
SLOT->TLL = SLOT->TL + (CH->ksl_base>>SLOT->ksl);