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Tilegen background colour
Posted:
Sat Oct 02, 2021 3:29 pmby Ian
I noticed in a few games especially at start the background colour is the inverse of what the actual hw is showing, ie white instead of black. Sometimes for only short periods.
Charles McDonald's write up of the tilegen says this:
If the bottommost layer is blanked, it is filled with color 0 of palette 0.
I assume this can be some colour other than zero? Or black. Maybe the issue is here
Re: Tilegen background colour
Posted:
Sun Oct 03, 2021 5:24 amby Ian
Screenshot of what I mean, this is from harley
Re: Tilegen background colour
Posted:
Thu Oct 14, 2021 8:36 amby Jiterdomer
LA Machineguns also during the Valley of Fire briefing screen. In the emulator itself, it just shows the screen fading in much like the Wii version, whereas the original HW flashes white after the flashing "SCRAMBLE" text screen.
https://youtu.be/pyy4nOqaM9M
Re: Tilegen background colour
Posted:
Thu Oct 14, 2021 9:12 amby Ian
Make a save state I'll have a look
Re: Tilegen background colour
Posted:
Sun Oct 31, 2021 12:54 amby Bart
I just saw this. Are we not using color 0? Indeed, this is very common for tile generators: the clear color is color 0, which allows it to be something other than black. It's a really easy fix if so.
EDIT: One complication is whether color offsets apply here. The Model 3 tile gen has an interesting color offset feature used for various fade-in/fade-out effects (and the lightning in Lost World) that isn't present on System 24. These are applied per layer. I wonder if palette 0 color 0 is modified by e.g. the layer B color offset. I assume not and will proceed accordingly.
Re: Tilegen background colour
Posted:
Mon Nov 01, 2021 10:06 pmby Bart
Is there a video I can look at of Harley booting? Color 0 for palette 0 is black, so even if I modify the code to always draw this for the bottom clear color, it has no effect.
Re: Tilegen background colour
Posted:
Tue Nov 02, 2021 12:47 amby Jiterdomer
Re: Tilegen background colour
Posted:
Mon Nov 15, 2021 2:24 pmby Ian
Lost world has the same. Right from the start the background is white
https://www.youtube.com/watch?v=IyGpwq5A-yY
Re: Tilegen background colour
Posted:
Sat Nov 20, 2021 4:12 amby Ian
Well I think I found out where the white is coming from. I *think* it's coming from jtag, it seems to get written at exactly the point where the screen flashes white in harley, and the same for the intro in lost world.
Re: Tilegen background colour
Posted:
Sat Dec 04, 2021 8:46 pmby model123
There was a video of Harley-Davidson & L.A. Riders
https://www.youtube.com/watch?v=kraFwQluDpY