sprite flicker

[chadderack]

Probably something basic. I've never enabled them before.

video demonstrates issue.

(The text in the upper left)

It actually flickers much faster than the video can capture; pretty much one frame on/one frame off.

Single playfield... BPLCON2 is set in the copper to $0024... but it doesn't seem like any value stops the flickering.
DMACON is set like this

    move.w #$87E0,DMACON(a6)

Thank you for any help!
Chad

[paraj]

How, or rather when, do you setup the sprite pointers? They need to be ready for line 25 (PAL) or 20 (NTSC) (http://eab.abime.net/showpost.php?p=...&postcount=200).

[chadderack]

Originally Posted by paraj

How, or rather when, do you setup the sprite pointers? They need to be ready for line 25 (PAL) or 20 (NTSC) (http://eab.abime.net/showpost.php?p=...&postcount=200).

Good to know! Thanks.
The wait at the beginning of the copperlist is this

    dc.w $2b01,$fffe

this is set a few lines later

    dc.w BPLCON2,$0024                                      ;move.w #$24,BPLCON2(a6)

and the pointers are set further down. I checked WinUAE debugger with watchpoints on the pointer locations in the copperlist, and the debugger never hit the watchpoints... which means to me that they remain the same--they aren't zeroed out.

[paraj]

Does the flickering stop if you set the pointers before your first wait? VPOS 0x2b is too late if you want easy, automatic mode for your sprites.

Also while it doesn't hurt, there's no reason to delay setting BPLCON2 until that point either (and you probably don't need to set it every frame, but that's probably premature optimization). In general I'd want to get as much as possible out of the way early in the copper list, unless it really needs to happen at a specific point.

[chadderack]

Originally Posted by paraj

Does the flickering stop if you set the pointers before your first wait? VPOS 0x2b is too late if you want easy, automatic mode for your sprites.

Also while it doesn't hurt, there's no reason to delay setting BPLCON2 until that point either (and you probably don't need to set it every frame, but that's probably premature optimization). In general I'd want to get as much as possible out of the way early in the copper list, unless it really needs to happen at a specific point.

Oh, I see what you mean. They need to be initialized *before* the wait. Let me try that

[chadderack]

Originally Posted by paraj

Does the flickering stop if you set the pointers before your first wait?

Yes! Thank you!

https://www.dropbox.com/s/88imiuxcl1..._gone.mp4?dl=0

[Leo24]

New Black Tiger port?

[chadderack]

Originally Posted by Leo24

New Black Tiger port?