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MRT
Account closed
Registered: Sep 2005
Posts: 149 |
FLI Bug
I came across the following situation:
Set the VIC to character mode and multicolor.
Now generate a badline every rasterline and changing $d018 so that the VIC fetches data from a new screen (Video Matrix Base Address) every rasterline...
In this situation the FLI bug only completely appears when the last eight bytes of the charset (the last char in the charset) are filled with $ff.
So, when you fill those bytes with $00, you won't see the FLI bug and the background color is shown.
And no need to mask the bug with sprites anymore!
Even if you draw a smiley in the last char, the FLI bug shows only those smileys!
Now, my questions...
1. Are my findings correct? Or is there more to it?
2. (How) Can this be done in bitmap mode?
I've only tested this on Vice and CCS, it may differ on a real C64 |
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Jetboy
Registered: Jul 2006
Posts: 337 |
It's there since forever - "DisplayList" like effects are done like that.
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Oswald
Registered: Apr 2002
Posts: 5094 |
displaylist like effects are not using fli, instead they stretch the very same line forever and change d018 each line to display different gfx.
fli and multi chars together wont really give you anything that couldnt be done easyer using another trick. (see above) |
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Viktor
Account closed
Registered: Apr 2002
Posts: 78 |
Thanks Oswald.
Viktor |
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Jetboy
Registered: Jul 2006
Posts: 337 |
Quote: displaylist like effects are not using fli, instead they stretch the very same line forever and change d018 each line to display different gfx.
fli and multi chars together wont really give you anything that couldnt be done easyer using another trick. (see above)
But that's almost exactly the same as FLI.
First charline in fli is stretched, while bitmap stays unstretched, and changed every line.
In Displaylist-like effects, first char line is stretched and changed every line.
It's not that big difference I would say. Only small difference in cycling.
BTW. how to get rid of the garbage after displaying fli, when you have border color other than black? |
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