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Atari coding BBS
| Re: Blitter in ST / Falcon |
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Posted by: Cyprian
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Apr,01.2008-02:43
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one year ago, during testing of STE blitter I prepared faster version of following C2P:
*
moveq #0,d2
move.w (a1)+,d2
lsl.w #4,d2
or.w (a1)+,d2
lsl.l #2,d2
move.l (a2,d2.l),d2
movep.l d2,Chunky_Render_licz(a0)
moveq #0,d2
move.w (a1)+,d2
lsl.w #4,d2
or.w (a1)+,d2
lsl.l #2,d2
move.l (a2,d2.l),d2
movep.l d2,1+Chunky_Render_licz(a0)
*
It bases on three blitter function: merge, clear and shift:
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blitter_function_merge
blitter_function_clear
blitter_function_shift
move.l (a1)+,d2
move.l (a2,d2.l),d2
movep.l d2,Chunky_Render_licz(a0)
move.l (a1)+,d2
move.l (a2,d2.l),d2
movep.l d2,1+Chunky_Render_licz(a0)
*
As far as I remember It's faster about 10 or 20 percent.
The Second advantage is that during blitting we can do MUL or DIV instructions.
There are two disadvantages:
- orginal buffer is destroyed;
- the only real STE can do this Blitter-C2P faster than non-blitter C2P
(Steem, Hatari and SainT are not able to MUL/DIV during blitting)
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Topic
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Posted by
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Date
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Blitter in ST / Falcon
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mikro
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Mar,19.2008-14:25
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Re: Blitter in ST / Falcon
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PeP
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Mar,19.2008-14:50
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Re: Blitter in ST / Falcon
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earx
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Mar,20.2008-12:41
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Re: Blitter in ST / Falcon
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frost
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Mar,19.2008-17:02
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Re: Blitter in ST / Falcon
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havoc
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Mar,20.2008-10:19
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Re: Blitter in ST / Falcon
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Peter
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Mar,20.2008-10:25
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Re: Blitter in ST / Falcon
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earx
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Mar,20.2008-12:43
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Re: Blitter in ST / Falcon
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PeP
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Mar,20.2008-16:34
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Re: Blitter in ST / Falcon
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earx
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Mar,20.2008-19:32
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Re: Blitter in ST / Falcon
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Cyprian
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Apr,01.2008-02:43
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Re: Blitter in ST / Falcon
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quackmore
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Apr,21.2008-08:18
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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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