Blitters' interleaved modulo issue

[sandruzzo]

I'm trying to draw by 256*256 pixel with half of its height, by setting source blitter modulo at (256/8). With regular bitplanes layout I have no problems, but with interleaved bitplanes, it doesn't work: is there anything that I have to change? Bitplanes pointers, bitplanes modulo are ok.

Correct version:



Here with interleaved: source modulo is: (256/8)*NumPlanes

[sandruzzo]

I'm doing my math: maybe isn't possible at all with interleaved.

[DanScott]

Only possible if the source and destination width are the same.

[sandruzzo]

@DanScott

I can't do that, cos I'm using that picture as lookup table for both x and y zoom

[a/b]

Originally Posted by sandruzzo

Here with interleaved: source modulo is: (256/8)*NumPlanes

(Width/8)*(NumPlanes-1) since you want to display 1 bitplane and then skip the rest to get to the correct next line.

[sandruzzo]

@a/b

It doesnt work, like I wanted: doing all with one blitter pass..

[a/b]

a->d blit:
moda = (width/8)*numplanes
modd = 0
size = (height/2)<<6+((width/8)*numplanes)/2

copper:
mods = (width/8)*(numplanes-1), plane0= bitmap+0*(Width/8), plane1 = bitmap+1*(Width/8), ...

Does this work?