Horizontal Copper WAIT on multiple lines

[KONEY]

Hello,

I'm building a copperlist which is basically two gradients: vertical and horizontal.

So now I'm adding the horizontal waits but it turns out I would need hundreds of them, if I have to repeat them for every line... So I'm asking if a trick or technique exists so that the instruction after a horizontal wait spans for multiple lines.

my decoded copperlist: (I know colors are wrong, I'll fix it

0180 0bbb          	;  COLOR00 := 0x0bbb
da45 dafe          	;  Wait for vpos & 0x5a >= 0xda and hpos >= 0x44
0180 0ddd          	;  COLOR00 := 0x0ddd
da49 dafe          	;  Wait for vpos & 0x5a >= 0xda and hpos >= 0x48
180 0fff          	;  COLOR00 := 0x0fff
da4d dafe          	;  Wait for vpos & 0x5a >= 0xda and hpos >= 0x4c
0180 1221          	;  COLOR00 := 0x1221
da51 dafe          	;  Wait for vpos & 0x5a >= 0xda and hpos >= 0x50
180 1443          	;  COLOR00 := 0x1443
da55 dafe          	;  Wait for vpos & 0x5a >= 0xda and hpos >= 0x54
0180 1665          	;  COLOR00 := 0x1665
da59 dafe          	;  Wait for vpos & 0x5a >= 0xda and hpos >= 0x58
180 1887          	;  COLOR00 := 0x1887
da61 dafe          	;  Wait for vpos & 0x5a >= 0xda and hpos >= 0x60
0180 1665          	;  COLOR00 := 0x1665
da65 dafe          	;  Wait for vpos & 0x5a >= 0xda and hpos >= 0x64
180 1443          	;  COLOR00 := 0x1443
da69 dafe          	;  Wait for vpos & 0x5a >= 0xda and hpos >= 0x68

Here it can be seen how gradients after Horizontal waits are only 1px:



thanks for any help!

[DanScott]

Yes, you can use a combination of SKIP's and copper jumps to "repeat" a horizontal line on the next line.

Have a look at Roondar's post today about copper screen, he uses that technique (with some probably well documented code available too)

[KONEY]

thanks!

[KONEY]

Roondar's post describes a much more complex technique and trying to extract what I need is a bit confusing. Knowing it's possible is already a good thing, hope to find some other examples.

[LaBodilsen]

i've played with this sometime ago, and thought there was a bug in winuae (which there was not).

But in the post is a very small example on how to repeat a copper line.
https://eab.abime.net/showthread.php?t=81184

I might have a better example stored some where, if you really want to take a look at it.

EDIT: I found a better example, which I have attached. It makes 3 splits down the screen, and repeat every line between the 3 splits. Also includes Pal workaround.

[KONEY]

@LaBodilsen thanks and sorry for the delay but I've been super busy releasing a musicdisk!

So your example works and I'm studying it. As far I understand there are 3 jumps because there's a limit in the height of repeated pattern and 3 jumps are required to fill the entire H of screen.

But I can't figure out how to make them shorter, I'm always ending up with the same height of about 1/3 of total height. Or maybe I'm doing it all wrong

[defor]

You may also look at this thread:
http://eab.abime.net/showthread.php?t=107705
You can see how to deal with $80/$100 vpos problem (if you encounter it).

[roondar]

Originally Posted by KONEY

@LaBodilsen thanks and sorry for the delay but I've been super busy releasing a musicdisk!

So your example works and I'm studying it. As far I understand there are 3 jumps because there's a limit in the height of repeated pattern and 3 jumps are required to fill the entire H of screen.

But I can't figure out how to make them shorter, I'm always ending up with the same height of about 1/3 of total height. Or maybe I'm doing it all wrong

You can make a Copper loop of any height as long as the vertical position doesn't cross either rasterline $80 or rasterline $100, so it should be possible to have many or just a few loops.

What values are you using for the SKIP & WAIT instructions? That might help fix the issue

[LaBodilsen]

Originally Posted by KONEY

@LaBodilsen thanks and sorry for the delay but I've been super busy releasing a musicdisk!

So your example works and I'm studying it. As far I understand there are 3 jumps because there's a limit in the height of repeated pattern and 3 jumps are required to fill the entire H of screen.

But I can't figure out how to make them shorter, I'm always ending up with the same height of about 1/3 of total height. Or maybe I'm doing it all wrong

To change the position og Split 2, you need to change both the wait address for skip, and repeat. so change both $7fe1 and $803f below

	dc.w	$7fe1,$7fff	;<-- Change here
 	dc.w	COPJMP2,$0	; Jump to CopJmp1 as set in COP2LCH

	dc.w	$0084,$0000,$0086,$0000		;Set COP2LCH
CopJmp2:	;split 2
	dc.w	$803f,$80fe	; <-- and change here