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[Core/Sound]

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* fixed YM2612 self-feedback regression introduced in 1.7.1
* fixed YM2612 one-sample extra delay on operator1 output
This commit is contained in:
EkeEke 2017-03-28 16:19:55 +02:00
parent b78ce06728
commit a62c6f9ffe
5 changed files with 28 additions and 19 deletions
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3
HISTORY.txt
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@ -70,6 +70,7 @@ Genesis Plus GX 1.7.5 (xx/xx/xxxx) (Eke-Eke)
[Core/SG]
---------------
* added support for new SMS Power Korean dumps (Star Soldier & Pippols)
* added support for SG-1000 II clone hardware (2KB RAM + integrated VDP/PSG chip 315-5066)
* fixed SG-1000 internal RAM size (1KB instead of 2KB)
* restored SG-1000 Pause button support
@ -117,6 +118,8 @@ Genesis Plus GX 1.7.5 (xx/xx/xxxx) (Eke-Eke)
---------------
* rewrote optimized & more accurate PSG core from scratch
* removed PSG boost noise feature & added optional high-quality PSG resampling
* fixed YM2612 self-feedback regression introduced in 1.7.1
* fixed YM2612 one-sample extra delay on operator1 output
[Gamecube/Wii]
---------------

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44
core/sound/ym2612.c
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@ -12,16 +12,23 @@
** Additional code & fixes by Eke-Eke for Genesis Plus GX
**
** Huge thanks to Nemesis, most of those fixes came from his tests on Sega Genesis hardware
** More informations at http://gendev.spritesmind.net/forum/viewtopic.php?t=386
** Additional info from YM2612 die shot analysis by Sauraen
** See http://gendev.spritesmind.net/forum/viewtopic.php?t=386
**
** TODO:
** - better documentation
** - BUSY flag emulation
** - accurate DAC output
*/
/*
** CHANGELOG:
**
** 12-03-2017 Eke-Eke (Genesis Plus GX):
** - fixed Op1 self-feedback regression introduced by previous modifications
** - removed one-sample extra delay on Op1 calculated output
** - refactored chan_calc() function
**
** 01-09-2012 Eke-Eke (Genesis Plus GX):
** - removed input clock / output samplerate frequency ratio, chip now always run at (original) internal sample frequency
** - removed now uneeded extra bits of precision
@ -1413,7 +1420,7 @@ INLINE signed int op_calc(UINT32 phase, unsigned int env, unsigned int pm)
INLINE signed int op_calc1(UINT32 phase, unsigned int env, unsigned int pm)
{
UINT32 p = (env<<3) + sin_tab[ ( (phase + pm ) >> SIN_BITS ) & SIN_MASK ];
UINT32 p = (env<<3) + sin_tab[ ( ( phase >> SIN_BITS ) + pm ) & SIN_MASK ];
if (p >= TL_TAB_LEN)
return 0;
@ -1424,32 +1431,31 @@ INLINE void chan_calc(FM_CH *CH, int num)
{
do
{
INT32 out = 0;
UINT32 AM = ym2612.OPN.LFO_AM >> CH->ams;
unsigned int eg_out = volume_calc(&CH->SLOT[SLOT1]);
m2 = c1 = c2 = mem = 0;
*CH->mem_connect = CH->mem_value; /* restore delayed sample (MEM) value to m2 or c2 */
if( eg_out < ENV_QUIET ) /* SLOT 1 */
{
INT32 out = CH->op1_out[0] + CH->op1_out[1];
CH->op1_out[0] = CH->op1_out[1];
if (CH->FB < SIN_BITS)
out = (CH->op1_out[0] + CH->op1_out[1]) >> CH->FB;
if( !CH->connect1 ){
/* algorithm 5 */
mem = c1 = c2 = CH->op1_out[0];
}else{
/* other algorithms */
*CH->connect1 += CH->op1_out[0];
}
out = op_calc1(CH->SLOT[SLOT1].phase, eg_out, out );
}
CH->op1_out[1] = 0;
if( eg_out < ENV_QUIET ) /* SLOT 1 */
{
if (!CH->FB)
out=0;
CH->op1_out[0] = CH->op1_out[1];
CH->op1_out[1] = out;
CH->op1_out[1] = op_calc1(CH->SLOT[SLOT1].phase, eg_out, (out<<CH->FB) );
}
if( !CH->connect1 ){
/* algorithm 5 */
mem = c1 = c2 = out;
}else{
/* other algorithms */
*CH->connect1 = out;
}
eg_out = volume_calc(&CH->SLOT[SLOT3]);
@ -1727,7 +1733,7 @@ INLINE void OPNWriteReg(int r, int v)
case 0: /* 0xb0-0xb2 : FB,ALGO */
{
CH->ALGO = v&7;
CH->FB = (v>>3)&7;
CH->FB = SIN_BITS - ((v>>3)&7);
setup_connection( CH, c );
break;
}