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[Core/CD] fixed 32x32 pixels stamp index masking during GFX operation (fixes #436)

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ekeeke 2022-05-31 01:52:17 +02:00
parent e366ca817f
commit 4ecd33f4cd
6 changed files with 10 additions and 4 deletions
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5
HISTORY.txt
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@ -39,15 +39,18 @@ Genesis Plus GX 1.7.5 (xx/xx/xxxx) (Eke-Eke)
* fixed WAV file detection to support files generated by Audacity/FFmpeg/libavformat with RIFF header metadata chunks
* fixed PRG-RAM access from MAIN-CPU side on system reset
* fixed state loading bug when SUB-CPU interrupt is pending
* fixed incorrect masking of Level 3 (GFX) interrupts (spurious freeze during Japanese BIOS intro)
* fixed H-INT vector handling when using Mode 1
* fixed H-INT vector upper word value
* fixed access to "write-only" communication flags (verified on real hardware by Notaz)
* fixed access to Sub-CPU "read-only" communication registers (fixes Round 5 Boss freeze in Streets of Rage / Sega Classics Arcade Collection)
* fixed byte access to memory mode, timer and font color registers at even address (verified on real hardware, cf. Krikzz's mcd-verificator)
* fixed byte access to font data registers
* fixed pending level 1 interrupts when GFX interrupt is disabled (fixes random freezes when exiting "Batman Returns" option menu)
* fixed CDD seek command again (Final Fight CD freeze with model 2 BIOS)
* fixed CDD status reported during seek/access time (sound effect synchronization issue in Bari Arm)
* fixed word access to CDD control register (fixes spurious audio track playback on startup with Mode 1 patched games using MSU-MD driver)
* fixed CD communication registers state on peripheral reset (fixes SUB-CPU side initialization in MSU-MD sample demo and some Mode 1 patched games using MSU-MD driver)
* fixed 32x32 pixels stamp index masking during GFX operation (fixes graphics rotation/scaling effects in "Chuck Rock II - Son of Chuck")
* optimized Sub-CPU / Main-CPU synchronization
[Core/MD]

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builds/genesis_plus_gx_libretro.dll
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7
core/cd_hw/gfx.c
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@ -2,7 +2,7 @@
* Genesis Plus
* CD graphics processor
*
* Copyright (C) 2012-2019 Eke-Eke (Genesis Plus GX)
* Copyright (C) 2012-2022 Eke-Eke (Genesis Plus GX)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met:
@ -460,6 +460,9 @@ INLINE void gfx_render(uint32 bufferIndex, uint32 width)
uint16 stamp_data;
uint32 stamp_index;
/* bits [1:0] of 32x32 pixels stamp index are masked (see Chuck Rock II - Son of Chuck) */
uint32 stamp_mask = (scd.regs[0x58>>1].byte.l & 0x02) ? 0x7fc : 0x7ff;
/* pixel map start position for current line (13.3 format converted to 13.11) */
uint32 xpos = *gfx.tracePtr++ << 8;
uint32 ypos = *gfx.tracePtr++ << 8;
@ -502,7 +505,7 @@ INLINE void gfx_render(uint32 bufferIndex, uint32 width)
/* c = cell offset (0-3 for 16x16, 0-15 for 32x32) */
/* yyy = line offset (0-7) */
/* xxx = pixel offset (0-7) */
stamp_index = (stamp_data & 0x7ff) << 8;
stamp_index = (stamp_data & stamp_mask) << 8;
if (stamp_index)
{

2
core/cd_hw/gfx.h
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@ -2,7 +2,7 @@
* Genesis Plus
* CD graphics processor
*
* Copyright (C) 2012-2019 Eke-Eke (Genesis Plus GX)
* Copyright (C) 2012-2022 Eke-Eke (Genesis Plus GX)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met: