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Atari coding BBS
| bitplane blurs |
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Posted by: damog
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Sep,23.2013-00:53
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hello all!
it's that time of the month where I plea for some assistance with a little something i'm working on.. it's driving me nuts.. mostly because i've done this before easily but for some reason i just can't get it going this time round :/
i've a 1 plane fx that i want to apply the cheap'n'cheerful bitplane trail/blur effect on. i just cant get it working properly!
here's the gist of the loop:
main_loop
lea blurpal132,a0 ;first palette
moveq #0,d0
move.w plane,d0 ;current plane
lsl.w #4,d0 ;x16
lea (a0,d0.w),a0
movem.l (a0),d0-d7
movem.l d0-d7,$ffff8240
do_fx
bsr plane_clear
bsr draw_to_plane
bsr screen_swap ;swap logic and physic, wait for vbl
update_plane
addq.w #1,plane_wait ;every other frame
andi.w #1,plane_wait
bne.s no_plane_reset
add.w #2,plane
cmp.w #6,plane ;rotate across 3 planes
bne.s no_plane_reset
move.w #0,plane
no_plane_reset
bra.s main_loop
so i update the plane offset every 2 frames, and at the top of the loop push the correct palette according to the plane variable.. i then draw the effect to the screenbase+plane offset..
my palette plane dominance order is:
vbl 1: 1,3,2
vbl 2: 1,3,2
vbl 3: 2,1,3
vbl 4: 2,1,3
vbl 5: 3,2,1
vbl 6: 3,2,1
and loop...
incase its not obvious i only want to trail across 3 planes..
can anyone see what i'm doing wrong?!!!
d
x
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