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Atari coding BBS
 
Re: STE stable fullscreen
Posted by: evil Aug,27.2015-18:07 

I think Patrice is on to something.
In our demos with variable hscrol for each line, I skipped value 0 and only ran with 1-15 to avoid the special case. For a nice 1 pixel scroller it won't be good enough, but for a big dist it worked quite well.

It's this prod: http://demozoo.org/productions/49741/ (end part)

Notice that the overlay text had to be un-disted (love blitter shift for that) :)


Source:

move.b d5,$ffff8265.w ;hscroll
movep.l d0,0(a1) ;screenaddr

move.b d7,$ffff8260.w ;left
move.w d7,$ffff8260.w

90 nops

move.w d7,$ffff820a.w ;right
move.b d7,$ffff820a.w

17 nops


It will generate 224 byte lw. I did not try it without opening the right border, but as we're resetting screen pointer each line, I don't think it matters anything.

Anyways, it is worth testing Patrices idea to nulling the reg before screenpointer and set it after left border :)

--
Anders Eriksson
ae@dhs.nu





[All messages in this thread]    [Start new thread]

Topic Posted by  Date 
STE stable fullscreen Leonard Aug,26.2015-16:10
  Re: STE stable fullscreen Patrice Mandin Aug,27.2015-16:45
    Re: STE stable fullscreen evil Aug,27.2015-18:07
      Re: STE stable fullscreen Leonard Aug,27.2015-18:19
        Re: STE stable fullscreen evil Aug,27.2015-18:38
          Re: STE stable fullscreen Leonard Aug,28.2015-09:26
            Re: STE stable fullscreen evil Aug,28.2015-10:27
              Re: STE stable fullscreen Patrice Mandin Aug,28.2015-18:43
                Re: STE stable fullscreen Leonard Aug,28.2015-20:55
                  Re: STE stable fullscreen Patrice Mandin Aug,29.2015-10:17
                    Re: STE stable fullscreen Leonard Aug,29.2015-10:23
                      Re: STE stable fullscreen Patrice Mandin Aug,29.2015-15:42
                        Re: STE stable fullscreen Bod/Effect Sep,29.2015-16:53
  Re: STE stable fullscreen Troed Sep,02.2015-11:41
    Re: STE stable fullscreen Troed Sep,02.2015-12:08


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