Emulations (running on Linux/Unix/Windows/macOS, utilizing SDL2) of some - mainly - 8 bit machines, including the Commodore LCD, Commodore 65, and the MEGA65 as well.
_Mirage_BD_ on Discord has some very useful observations (thanks!) in terms of bugs in Xemu's VIC-IV emulation. This issue stands here as a reminder for me not to forget these and also as a place to discuss further this (these) issues.
The good: MEGAJPG seems to work (compared to 2023/July/2 state) basically
The bad: ... however the file selector has a strange red background which was not the case before:
His suggestion:
if bold and reverse both need to be set, shouldn't SXA_ATTR_ALTPALETTE(cw) in vic4.h be this:
#define SXA_ATTR_ALTPALETTE(cw) (((cw) & 0x0060) == 0x0060) instead of just ((cw) & 0x0060)
[...]
Just had another look at it, and the other thing you'll have to change is line 1474 of vic4.c:
const Uint32 *palette_now = ((REG_VICIII_ATTRIBS) && SXA_ATTR_ALTPALETTE(color_data)) ? altpalette : used_palette;
The change being the extra check for REG_VICIII_ATTRIBS... The alternate palette only has to be selected if bold+reverse and
vic3-attribs are enabled. That with the fix for the #define fixes all the issues in my programs.
And the ugly: bad border colour?
Unknown if there is anything related to the previous topic here, or something independent as a bug. Xemu currently does this, when it needs to render border colour: palette[REG_BORDER_COLOR]. Maybe this should be done?
used_palette[REG_BORDER_COLOR]
_Images got from Discord and were taken by Mirage_BD._
_
Mirage_BD_ on Discord has some very useful observations (thanks!) in terms of bugs in Xemu's VIC-IV emulation. This issue stands here as a reminder for me not to forget these and also as a place to discuss further this (these) issues.The thread on Discord: https://discord.com/channels/719326990221574164/781481205639020554/1249020115085955123
Test program: megajpg.d81.zip
The highlights (so far):
The good: MEGAJPG seems to work (compared to 2023/July/2 state) basically
The bad: ... however the file selector has a strange red background which was not the case before:
His suggestion:
And the ugly: bad border colour?
Unknown if there is anything related to the previous topic here, or something independent as a bug. Xemu currently does this, when it needs to render border colour:
palette[REG_BORDER_COLOR]. Maybe this should be done?used_palette[REG_BORDER_COLOR]_Images got from Discord and were taken by
Mirage_BD._