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Atari coding BBS
| Re: clear pixel |
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Posted by: gloky
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Nov,05.2013-09:29
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thanx for the very positive feedback :)
thank you evil for explanations
sorry to be so slow to answer
to calculate the or.b code i use a table convX with instructions or.b dn,dep(a0)
so when i take the long word at convX+x*4 i get the appropriate instruction
corresponding to ploting at (x,0)
and i uses also convY witch contain y*160
so with d0=x, d1=y, a0=convX, a1=convY i get the appropriate instruction to puting pixel at x,y with this code:
lsl #2,d0
move.l (a0,d0),d2 ; d2 = (convX+x*4) = 'or.b dn,ofsx(a0)'
add d1,d1
add.w (a1,d1),d2 ; now d2.l = the code for 'or.b dn,ofsx+ofsy(a0)'
after that, d2.l is copied in a a buffer containing all the generated code
and with convX and convY we can also do subpixel by repeating the instruction or the value
ie instead of 320 or.b dn,ofsx(a0) there is 640 or.b dn,ofsx(a0) in convX
exemple with convY:
convy: ds.w 0,0
ds.w 160,160
ds.w 320,320
ds.w 480,480
...
etc
we can also get rid of decalage instructions of x and y when calculate x and y
that's all for the moment :)
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Topic
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Posted by
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Date
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clear pixel
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gloky
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Oct,20.2013-11:44
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Re: clear pixel
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specter
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Oct,24.2013-04:19
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Re: clear pixel
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evil
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Oct,24.2013-16:58
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Re: clear pixel
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nerve
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Oct,25.2013-18:18
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Re: clear pixel
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gwEm
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Oct,27.2013-22:57
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Re: clear pixel
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gloky
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Nov,05.2013-09:29
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Re: clear pixel
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Leonard
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Nov,13.2013-02:30
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Re: clear pixel
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gloky
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Nov,16.2013-12:54
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Re: clear pixel
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gloky
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Nov,27.2013-00:44
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Re: clear pixel
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RA/pdx
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Nov,13.2013-10:27
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Re: clear pixel
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leonard
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Nov,14.2013-01:15
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Re: clear pixel
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RA/pdx
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Nov,14.2013-10:01
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Re: clear pixel
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leonard
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Nov,16.2013-11:49
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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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