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[Core/Sound] reverted change made to FM chip synchronization on CPU reads (fixes TMNT Tournament Fighters broken music when using Nuked core + Overdrive II demo music desyncing too fast with MAME/Nuked cores)

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ekeeke 2019-11-28 00:51:13 +01:00
parent e329aa1cc7
commit 791048af4c
5 changed files with 4 additions and 4 deletions
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builds/genesis_plus_gx_libretro.dll
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core/sound/sound.c
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@ -3,7 +3,7 @@
* Sound Hardware * Sound Hardware
* *
* Copyright (C) 1998-2003 Charles Mac Donald (original code) * Copyright (C) 1998-2003 Charles Mac Donald (original code)
* Copyright (C) 2007-2018 Eke-Eke (Genesis Plus GX) * Copyright (C) 2007-2019 Eke-Eke (Genesis Plus GX)
* *
* Redistribution and use of this code or any derivative works are permitted * Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met: * provided that the following conditions are met:
@ -126,7 +126,7 @@ static unsigned int YM2612_Read(unsigned int cycles, unsigned int a)
if ((a == 0) || (config.ym2612 > YM2612_DISCRETE)) if ((a == 0) || (config.ym2612 > YM2612_DISCRETE))
{ {
/* synchronize FM chip with CPU */ /* synchronize FM chip with CPU */
fm_update(cycles - fm_cycles_ratio + 1); fm_update(cycles);
/* read FM status */ /* read FM status */
if (cycles >= fm_cycles_busy) if (cycles >= fm_cycles_busy)
@ -211,7 +211,7 @@ static void YM3438_Write(unsigned int cycles, unsigned int a, unsigned int v)
static unsigned int YM3438_Read(unsigned int cycles, unsigned int a) static unsigned int YM3438_Read(unsigned int cycles, unsigned int a)
{ {
/* synchronize FM chip with CPU */ /* synchronize FM chip with CPU */
fm_update(cycles - fm_cycles_ratio + 1); fm_update(cycles);
/* read FM status */ /* read FM status */
return OPN2_Read(&ym3438, a); return OPN2_Read(&ym3438, a);

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core/sound/sound.h
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@ -3,7 +3,7 @@
* Sound Hardware * Sound Hardware
* *
* Copyright (C) 1998-2003 Charles Mac Donald (original code) * Copyright (C) 1998-2003 Charles Mac Donald (original code)
* Copyright (C) 2007-2018 Eke-Eke (Genesis Plus GX) * Copyright (C) 2007-2019 Eke-Eke (Genesis Plus GX)
* *
* Redistribution and use of this code or any derivative works are permitted * Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met: * provided that the following conditions are met: