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Axel
Account closed
Registered: Apr 2006
Posts: 42 |
Hires image scrolling
How to scroll hires image 400 pixels high (without videoram) up and down smoothly? |
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Krill
Registered: Apr 2002
Posts: 2852 |
Oswald: I referred to Carlos's statement about using char gfx to display hires images. |
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yago
Registered: May 2002
Posts: 332 |
A 4-color-bitmap can be converted to different multicolor-charsets.
To speed up the scrolling, different screens can be used.
Now up/down scrolling only takes some irqs and no data-copying.
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Monte Carlos
Registered: Jun 2004
Posts: 351 |
@Krill
Axel said: "Without Videoram". ;)
Anyway, you could scroll the color-ram as well or use the
extended color mode with 4times more charsets. Not as flexible
as hbm, but perhaps flexible enough.
Monte
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Oswald
Registered: Apr 2002
Posts: 5023 |
imho axel ment with without videoram that he needs a HW scroll solution. |
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Monte Carlos
Registered: Jun 2004
Posts: 351 |
I may be stupid, but what's HW?
Monte
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Oswald
Registered: Apr 2002
Posts: 5023 |
Hard Ware |
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HCL
Registered: Feb 2003
Posts: 717 |
Maybe Axel can just tell us.. or better show us the picture. Then i think everyone can figure the best way of moving it :). |
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Axel
Account closed
Registered: Apr 2006
Posts: 42 |
I wanted to scroll zoomed samurai picture, this from my Samurai demo.
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HCL
Registered: Feb 2003
Posts: 717 |
Oh, so we're too late then (darn!)..
Well, i think most ideas of how to move that picture are already mentioned here. Without further knowledge about different vic-tricks, the copy-method is of course the easiest way. First use hardware scrolling by setting $d011 to values between $30 and $37, then simply copy the whole picture to a new buffer, and finally as you re-start the d011-scrolling you also switch to the new gfx-buffer. (Waiting for Samurai 2 ;). |
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algorithm
Registered: May 2002
Posts: 702 |
The $d800 area may cause some problems I did a simple bitmap scroll routine (no linecrunch used) 320x200 multicolor koala two screen high picture. Its trivial enough to do this via double buffering, but $d800 needs to be copied as fast as possible (preferably not while the raster beam is on the picture) |
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