Burning rubber is displayed in color even though the CPC is set to black and white

Question

Burning rubber is displayed in color even though the CPC is set to black and white

cpcbegin opened this issue 4 years ago · 3 comments

cpcbegin commented 4 years ago

You can see on this video at this point.

I try the lastest code of april 9, 2021 compiled in GNU/Linux (Ubuntu Mate 20.04).

Answer 1 · 2021-04-10T08:17:39.000Z

Interesting. I checked and this is an old bug, not introduced by the migration to SDL2.

Answer 2 · 2021-04-10T08:20:02.000Z

The problem is that in asic.cpp, when we set the palette, we do not check CPC.scr_tube.
There's actually a TODO for it:

// TODO: deduplicate with code in video_set_palette + make it work in monochrome

Answer 3 · 2021-04-10T08:36:01.000Z

The problem is that the Plus mode offers 4096 colors instead of just 32, so we need some generic code to convert the colors.
Fortunately, #135 provides just that.
Currently we support two green modes but with the Plus, we may have to force the libretro one ...
Or manage to find a formula that reproduces the original Caprice32 green mode.