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[Core/CD] improved SUB-CPU synchronization with graphics processing when polling end of graphics operation

This commit is contained in:
ekeeke 2024-02-20 13:59:36 +01:00
parent 30dfba4966
commit 771452f7a1
5 changed files with 11 additions and 5 deletions
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builds/genesis_plus_gx_libretro.dll
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builds/genplus_cube.dol
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14
core/cd_hw/gfx.c
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@ -2,7 +2,7 @@
* Genesis Plus
* CD graphics processor
*
* Copyright (C) 2012-2023 Eke-Eke (Genesis Plus GX)
* Copyright (C) 2012-2024 Eke-Eke (Genesis Plus GX)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met:
@ -683,7 +683,7 @@ void gfx_update(int cycles)
/* update Vdot remaining size */
scd.regs[0x64>>1].byte.l -= lines;
/* increment cycle counter */
/* update cycle counter */
gfx.cycles += lines * gfx.cyclesPerLine;
}
else
@ -694,14 +694,20 @@ void gfx_update(int cycles)
/* clear Vdot remaining size */
scd.regs[0x64>>1].byte.l = 0;
/* update cycle counter */
gfx.cycles += lines * gfx.cyclesPerLine;
/* end of graphics operation */
scd.regs[0x58>>1].byte.h = 0;
/* SUB-CPU idle on register $58 polling ? */
if (s68k.stopped & (1<<0x08))
{
/* sync SUB-CPU with GFX chip */
s68k.cycles = scd.cycles;
/* sync SUB-CPU with GFX chip (only if not already ahead) */
if (s68k.cycles < gfx.cycles)
{
s68k.cycles = gfx.cycles;
}
/* restart SUB-CPU */
s68k.stopped = 0;

2
core/cd_hw/gfx.h
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@ -2,7 +2,7 @@
* Genesis Plus
* CD graphics processor
*
* Copyright (C) 2012-2023 Eke-Eke (Genesis Plus GX)
* Copyright (C) 2012-2024 Eke-Eke (Genesis Plus GX)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met: