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Testa
Account closed
Registered: Oct 2004
Posts: 197 |
is a split sideborder scroll done before??
high party people.
the last days i was bussy with coding a sideborder split scroll. with a split scroll i simply mean a scroll that scrolls the left 20 chars to the left and the right 20 chars to the right. through the sideborders... smooth ofcourse and i only used sprites in the sideborder, so no ugly extented graphics...
not very hard to code but i had some fun... the question i have is this done before and is there a record.. my version holds 25 chars high, and you only can use one speed... it scrolls the whole picture one pixel each frame...
i am curious.
greetings,
Testa
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Oswald
Registered: Apr 2002
Posts: 5094 |
hmm really, what happens if one splits d016 in the middle of a line ? :) fex. fineshift=0 on the left side then 7 in the middle then simply d021 comes through where the screen is "teared appart" ? :) is this possible with d011 or one of the known d011 effects will come alive, or nothing? :) |
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doynax
Account closed
Registered: Oct 2004
Posts: 212 |
Quote: hmm really, what happens if one splits d016 in the middle of a line ? :) fex. fineshift=0 on the left side then 7 in the middle then simply d021 comes through where the screen is "teared appart" ? :) is this possible with d011 or one of the known d011 effects will come alive, or nothing? :)
I expect x scrolling works much like y scrolling or the sideborders. That is the register value is used simply to determine when to start a process, in this case on which sub-cycle in the left border to start clocking pixels through the display shift register.
In other words I don't expect changing the x fine-scroll in the middle of a scanline to change anything. |
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WVL
Registered: Mar 2002
Posts: 902 |
Quote: Hey Testa, still don't know if you mean something like in this:
Happy New Year 2008
[/url]
just a shitty 1x1-d016-split-borderscroller I did in 1993... definately your version sounds like pushing limits \ö/
obviously this isnt a d016 split ;) but more like a rol/asl scroller. (it looks nice tho! :D) |
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WVL
Registered: Mar 2002
Posts: 902 |
Quote: I expect x scrolling works much like y scrolling or the sideborders. That is the register value is used simply to determine when to start a process, in this case on which sub-cycle in the left border to start clocking pixels through the display shift register.
In other words I don't expect changing the x fine-scroll in the middle of a scanline to change anything.
Ofcourse it does :( How else do you think Cruzer made those rocking highres arrows in the lower border + 8 sprites in One Year Camelot III? Or the 41 column wide picture Soundemon made in Tense Years? |
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JackAsser
Registered: Jun 2002
Posts: 2014 |
Quote: Ofcourse it does :( How else do you think Cruzer made those rocking highres arrows in the lower border + 8 sprites in One Year Camelot III? Or the 41 column wide picture Soundemon made in Tense Years?
40.875 if I may...
:D
I split hair and you split registers. |
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Testa
Account closed
Registered: Oct 2004
Posts: 197 |
Quote: obviously this isnt a d016 split ;) but more like a rol/asl scroller. (it looks nice tho! :D)
yeps, but totally rol/asl a 40 by 25 chars picture is impossible ofcourse.. i used $d016 splits but not at the badlines. at the badlines , and only at the right half of the picture i use ror to scroll the graphics, so i role 25 * 20 bytes.. the ror speedcode is mixed with the rastercode of the sideborder routine..
i also used different screens to scroll all the charpointers... dma delay is not an option here and read and restore all the charpointers takes too much rastertime, so i used different screens and clever memory management...
to move all the graphics through the sideborder, i use different frames (this is why you can only use one scroll speed) and i also used double buffers for the sprites so you simply can change all the spritepointers at the right moment..
one min point of this story is that you can't show/scroll any new graphics... the distance between both halfs simply gets bigger until the whole picture is gone.... (oswald: i hope this is what you mean)
this way splitscrolling a 25 by 40 chars picture is no problem at all, i am suprised this isn't done before..
it is not hard at all.... well i hope i explained enough now.. becoz i gave away a pefectly nice little effect now,..... but you are welcome....
and one last hint.. you can also use a 52 chars wide sideborder picture, too make it even more cooler...
and when you have scrolled 16 chars and there are 24 chars left you can always switch to a 8 sprite sideborder routine (only sprites) and scroll the remaining chars in different speeds (to polish the effect more)... but if you do this there is not much free memory left i am afraid..... (becoz the remaining 24 graphic chars must be converted to sprites aswell)
greetings,
Testa
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Danzig
Registered: Jun 2002
Posts: 440 |
Quote: Ofcourse it does :( How else do you think Cruzer made those rocking highres arrows in the lower border + 8 sprites in One Year Camelot III? Or the 41 column wide picture Soundemon made in Tense Years?
it IS a $d016-splitscroller. An easy one 7 pixels, no badline. it was just a proove of concept back then. at time I was in Comic Pirates, PJ Dynamix did that routine with a 2x2-scroller skipping the badline (it's black in the font :D ) and no sideborder. I told him that would have been cool in border and he claimed: Not possible!
Testa: Sure you can do a larger one. just skip the badlines and change the font. remember: april 1993 ;) |
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Testa
Account closed
Registered: Oct 2004
Posts: 197 |
danzig, i am not sure what you mean with bigger, i already used 192 graphics lines and black lines each bad line is not good enough for me.. .. just read the post before yours , everthing is there....
have a nice weekend!
bye
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Danzig
Registered: Jun 2002
Posts: 440 |
you got me wrong :) i mean you can make it BIGGER than my old 7 pixel version.
but the question was: done before? answer: yes ;)
EDIT: and NO, I don't want a world first entry on codebase for that crap :D |
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Testa
Account closed
Registered: Oct 2004
Posts: 197 |
crab? you mean those nice tastefull red lobsters???? he he... |
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