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Atari demoscene BBS
| Re: Doom floor texturing |
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Posted by: dml
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Jan,21.2013-21:33
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...minor update to the original message:
I did get the 2nd tex addressing method to work properly after all - just a schoolboy error first time round with setup code. So it looks like this:
ifd floormethod2
move.w a0,d0 ; 2:0 2 mv
and.w d3,d0 ; 2:0 2 t=v&mv
or.w d1,d0 ; 2:0 2 t|=u
move.b (a1,d0.w*2),d6 ; 2:0 4
and.w d4,d1 ; 2:0 2 u&=mu (wrap u)
addx.l d5,d1 ; 2:0 2 u+=du
addx.l d7,d3 ; 2:0 2 v+=dv
move.w d6,(a6)+ ; 0:0 2
else ; old version
move.l d3,d0 ; 2:0 2
move.w d1,d0 ; 2:0 2
lsr.l #6,d0 ; 4:0 4
lsr.w #4,d0 ; 4:0 4
move.b (a1,d0.w*2),d6 ; 2:0 4
add.l d7,d3 ; 2:0 2
add.w d5,d1 ; 2:0 2
move.w d6,(a6)+ ; 0:0 2
endc
Unfortunately Hatari tests show the new version, which should take 4 fewer cycles, to be slightly slower than the old one even taking into account the slight increase in setup size (I cut the loop unroll to make a fair comparison). Scratches head!!! I checked the Hatari cycle sheet in case there was an error but I don't see it. So code alignment maybe... weird.
Anyway none of this changes the fact I'm still looking for a cheaper way if one turns up.
Cheers
d.m.l
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[All messages in this thread] [Start new thread]
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Topic
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Posted by
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Date
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Doom floor texturing
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dml
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Jan,21.2013-18:47
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Re: Doom floor texturing
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dml
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Jan,21.2013-18:48
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Re: Doom floor texturing
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dml
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Jan,21.2013-21:33
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Re: Doom floor texturing
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Defjam
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Jan,21.2013-21:44
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Re: Doom floor texturing
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dml
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Jan,21.2013-22:38
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Re: Doom floor texturing
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dml
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Jan,22.2013-10:48
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Re: Doom floor texturing
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mikro
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Jan,22.2013-11:03
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Re: Doom floor texturing
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dml
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Jan,22.2013-11:43
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Re: Doom floor texturing
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mikro
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Jan,22.2013-13:30
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Re: Doom floor texturing
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mikro
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Jan,22.2013-13:36
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Re: Doom floor texturing
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mikro
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Jan,22.2013-13:37
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Re: Doom floor texturing
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dml
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Jan,22.2013-15:18
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Re: Doom floor texturing
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mikro
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Jan,22.2013-16:22
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Re: Doom floor texturing
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dml
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Jan,23.2013-00:55
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Re: Doom floor texturing
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mikro
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Jan,23.2013-10:12
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Re: Doom floor texturing
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dml
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Jan,23.2013-13:00
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Re: Doom floor texturing
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Calimero
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Jan,24.2013-03:14
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Re: Doom floor texturing
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ggn
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Jan,22.2013-16:41
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Re: Doom floor texturing
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ggn
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Jan,22.2013-16:42
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Re: Doom floor texturing
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dml
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Jan,23.2013-01:07
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Re: Doom floor texturing
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dml
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Feb,03.2013-20:23
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Re: Doom floor texturing
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mikro
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Feb,03.2013-22:07
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Re: Doom floor texturing
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dml
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Jan,23.2013-18:01
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Re: Doom floor texturing
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mikro
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Jan,23.2013-23:39
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What's the anti-troll code?
That's your personal code to be able to add comments and messages on the dhs.nu site.
Don't have a code or forgot it? Fix it here.
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