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Atari coding BBS
| Re: Clear 1 bpl fast? |
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Posted by: evil
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Sep,12.2009-18:07
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The blitter beats it easily.
Here's a full bliter setup for clearing one bpl:
lea.l $ffff8a00.w,a0 ;32 byte halftone ram
rept 16/2
clr.l (a0)+
endr
move.w #0,$ffff8a20.w ;source x inc
move.w #0,$ffff8a22.w ;source y inc
move.l empty_adr,$ffff8a24.w ;source address
move.w #-1,$ffff8a28.w ;endmask 1
move.w #-1,$ffff8a2a.w ;endmask 2
move.w #-1,$ffff8a2c.w ;endmask 3
move.w #8,$ffff8a2e.w ;dest x inc
move.w #8,$ffff8a30.w ;dest y inc
move.l screen_adr,$ffff8a32.w ;destination address
move.w #20,$ffff8a36.w ;x count (n words per line to copy)
move.w #200,$ffff8a38.w ;y count (n lines to copy)
move.b #%00000001,$ffff8a3a.w ;blit hop (halftone mix)
move.b #%00000000,$ffff8a3b.w ;blit op (logic op)
move.b #%11000000,$ffff8a3c.w ;blitter control, start blitter
Most registers can be inited in beforehand so you only need a couple for each clear (I forgot which so you have to do some tests there).
--
Anders Eriksson
ae@dhs.nu
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Topic
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Posted by
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Date
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Clear 1 bpl fast?
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Per Almered (XiA)
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Sep,12.2009-13:05
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Re: Clear 1 bpl fast?
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frank_c_b
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Sep,12.2009-14:31
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Re: Clear 1 bpl fast?
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RA/pdx
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Sep,12.2009-15:38
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Re: Clear 1 bpl fast?
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evil
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Sep,12.2009-18:07
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Re: Clear 1 bpl fast?
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Per Almered (XiA)
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Sep,12.2009-21:53
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Re: Clear 1 bpl fast?
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Per Almered (XiA)
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Sep,12.2009-22:13
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Re: Clear 1 bpl fast?
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Frank_c_b
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Sep,12.2009-22:37
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Re: Clear 1 bpl fast?
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Per Almered (XiA)
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Sep,12.2009-22:43
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Re: Clear 1 bpl fast?
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frank_c_b
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Sep,12.2009-22:47
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Re: Clear 1 bpl fast?
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Per Almered (XiA)
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Sep,12.2009-22:56
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Re: Clear 1 bpl fast?
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frank_c_b
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Sep,12.2009-23:06
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Re: Clear 1 bpl fast?
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Frank_c_b
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Sep,12.2009-23:12
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Re: Clear 1 bpl fast?
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ggn
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Sep,12.2009-23:02
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Re: Clear 1 bpl fast?
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Bod
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Sep,13.2009-20:23
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Re: Clear 1 bpl fast?
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Per Almered (XiA)
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Sep,14.2009-21:11
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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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