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[Core/VDP] added support for background color changes during HBLANK when display is disabled (fixes #462)

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ekeeke 2022-09-19 14:11:16 +02:00
parent 2d28c67316
commit dded47d5e7
6 changed files with 5 additions and 4 deletions
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1
HISTORY.txt
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@ -125,6 +125,7 @@ Genesis Plus GX 1.7.5 (xx/xx/xxxx) (Eke-Eke)
[Core/VDP]
---------------
* added support for background color changes during HBLANK when display is disabled (fixes incorrect colored line in Yuu Yuu Hakusho)
* added optional enhanced 2-cell vertical scroll rendering mode (credits to AlexKiri)
* implemented proper FIFO ring-buffer & unused bits behavior on CRAM/VSRAM reads (verified on real hardware by Nemesis)
* improved accuracy of DMA Copy/Fill & added support for CRAM/VSRAM Fill (verified on real hardware by Nemesis)

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builds/genesis_plus_gx_libretro.dll
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6
core/vdp_ctrl.c
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@ -5,7 +5,7 @@
* Support for SG-1000 (TMS99xx & 315-5066), Master System (315-5124 & 315-5246), Game Gear & Mega Drive VDP
*
* Copyright (C) 1998-2003 Charles Mac Donald (original code)
* Copyright (C) 2007-2017 Eke-Eke (Genesis Plus GX)
* Copyright (C) 2007-2022 Eke-Eke (Genesis Plus GX)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met:
@ -2208,8 +2208,8 @@ static void vdp_bus_w(unsigned int data)
color_update_m5(0x00, data);
}
/* CRAM modified during HBLANK (Striker, Zero the Kamikaze, etc) */
if ((v_counter < bitmap.viewport.h) && (reg[1] & 0x40) && (m68k.cycles <= (mcycles_vdp + 860)))
/* CRAM modified during HBLANK (Striker, Zero the Kamikaze, Yuu Yuu Hakusho, etc) */
if ((v_counter < bitmap.viewport.h) && (m68k.cycles <= (mcycles_vdp + 860)) && ((reg[1] & 0x40) || (index == border)))
{
/* Remap current line */
remap_line(v_counter);

2
core/vdp_ctrl.h
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@ -5,7 +5,7 @@
* Support for SG-1000 (TMS99xx & 315-5066), Master System (315-5124 & 315-5246), Game Gear & Mega Drive VDP
*
* Copyright (C) 1998-2003 Charles Mac Donald (original code)
* Copyright (C) 2007-2017 Eke-Eke (Genesis Plus GX)
* Copyright (C) 2007-2022 Eke-Eke (Genesis Plus GX)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met: