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JackAsser
Registered: Jun 2002
Posts: 1994 |
Right-most sideborder sprite bug
If you remove the sideborder and place any sprite at the very right most place in the border you will see about 8 pixels wide garbage on the line before the actual sprite (all 21 sprite lines are accounted for below this point). This is also some kind of sprite data and share the colors from the sprite that is about to be shown. VICE emulates it somewhat correct. This means that the sprite is actually 22 lines high?!
How and why does this occur and from where are the pixels fetched when the bug is outputed (or is it a bus-lock of some kind)? |
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JackAsser
Registered: Jun 2002
Posts: 1994 |
@style: but usually the side border is closed there... that's probably what Graham referred too... Personally I used the change-color-fix in one part, and move-in-x in another part. Both equally effective to squach that bug to oblivion. |
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Oswald
Registered: Apr 2002
Posts: 5029 |
could we have a screenshot of the bug ? |
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Krill
Registered: Apr 2002
Posts: 2855 |
Oswald: Check 1 Year Totally Stoned by Booze Design, the greetings part (BD.4*), the bug also occurs when using VICE.
I think nobody mentioned it before, but not only is there garbage one line before the sprite is displayed, but also that very sprite is prematurely cut off in its last line at the x-position where that bug occurs. |
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Style
Registered: Jun 2004
Posts: 498 |
yes, thats true also.
For my sideborder DYSP I cheated and ignored that fact :D
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Oswald
Registered: Apr 2002
Posts: 5029 |
style, would you please stop acting like wanderer ? open a sepearete thread about ur sideborder dysp instead of polluting this one. |
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Oswald
Registered: Apr 2002
Posts: 5029 |
vic article:
"4. In the first phase of cycle 58, the MC of every sprite is loaded from its belonging MCBASE (MCBASE->MC) and it is checked if the DMA for the sprite is turned on and the Y coordinate of the sprite matches the lower 8 bits of RASTER. If this is the case, ____the display of the sprite is turned on._____"
now the question left is that where does the data come from. |
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Style
Registered: Jun 2004
Posts: 498 |
Quote: style, would you please stop acting like wanderer ? open a sepearete thread about ur sideborder dysp instead of polluting this one.
errrm, since my allborder DYSP was a) done recently so it's fresh in my mind and b) had the sprite bug that I had to work around, I though it was kind of topical :)
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Graham
Account closed
Registered: Dec 2002
Posts: 990 |
@Oswald: I answered the question already. |
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HCL
Registered: Feb 2003
Posts: 717 |
Yepp, check the greetings part in 1 year Totally Stoned / Booze Design as Krill mentioned. That part is a perfect display of all possible sprite bugs when opening the sideborder :). |
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Oswald
Registered: Apr 2002
Posts: 5029 |
graham, you havent answered the "why" part of the question :P |
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