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Atari coding BBS
| Re: Mapping question |
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Posted by: Patrice Mandin
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May,13.2014-21:44
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My fave is using roll and lsrw (specially since I needed variable texture size, for a single routine), shamelessly stolen from amiga doom originally:
;D0: U and V texture coordinates, packed in a 32bits value:
; UUuuVVvv
;D1: temp value
;D2: number of bits for V coordinate
;D3: number of bits for U coordinate
;D4: number of pixels to draw
;D5: DU and DV texture increments, like D0: DUduDVdv
;D6: texture pixel
;A0: texture data (1 BYTE per pixel)
;A1: palette data (1 LONG per color index, because it stores
; up to 32bits color value)
;A2: screen
loop:
move.l D0,D1 ; D1 = UUuuVVvv
lsr.w D2,D1 ; D1 = UUuu00VV
rol.l D3,D1 ; D1 = uu00VVUU
move.b (A0,D1.W),D6 ; read pixel from texture
move.b 3(A1,D6.W*4),D1 ; read color from palette
move.b D1,(A2)+ ; write pixel to screen
add.l D5,D0 ; increment texture coordinate
subq.l #1,D4
bpl.s loop
More about it on my site:
http://pmandin.atari.org/dotclear/index.php?2013/11/27/287-optimizing-for-68060-cpu
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Topic
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Posted by
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Date
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Mapping question
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Laurent / Thadoss
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May,08.2014-16:22
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Re: Mapping question
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dml
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May,08.2014-19:04
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Re: Mapping question
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Laurent / Thadoss
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May,08.2014-20:39
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Re: Mapping question
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dml
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May,09.2014-00:27
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Re: Mapping question
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Laurent / Thadoss
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May,08.2014-22:24
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Re: Mapping question
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Defjam
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May,12.2014-16:57
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Re: Mapping question
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dml
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May,13.2014-10:41
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Re: Mapping question
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p01
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Jan,06.2015-00:01
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Re: Mapping question
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evil
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Jan,06.2015-18:36
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Re: Mapping question
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Laurent / Thadoss
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Jan,06.2015-21:58
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Re: Mapping question
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p01
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Jan,06.2015-23:17
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Re: Mapping question
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p01
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Jan,09.2015-13:46
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Re: Mapping question
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Orion_
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Jan,09.2015-17:15
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Re: Mapping question
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Cyg
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Jan,09.2015-23:34
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Re: Mapping question
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Patrice Mandin
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May,13.2014-21:44
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Re: Mapping question
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Laurent / Thadoss
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May,14.2014-22:08
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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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