Re: [stella] Sprite graphics

Subject: Re: [stella] Sprite graphics
From: "Andrew Davie" <atari2600@xxxxxxxxxxxxx>
Date: Mon, 11 Oct 2004 18:13:55 +1100
Y-register is never initialised.  Set it to 0 at the start of every frame!

----- Original Message ----- From: "Kevin Lipe" <kevin.lipe@xxxxxxxxx>
To: <stella@xxxxxxxxxxxxxxxxxx>
Sent: Monday, October 11, 2004 5:52 PM
Subject: [stella] Sprite graphics

OK, So I took the advice given me in the other thread that I started,
"Confused newbie..." and read back through the Stella Programmer's
Guide, Andrew Davie's tutorials, and 2600 101, and I've gotten to the
end of Andrew's tutorials and I don't know what's happening.

I've got the code to display the "Bad Llama" sprite working, and
something appears and moves across the screen like it's supposed to,
but... the graphics are all screwed up and I have no idea why.

Just so all the labels and stuff in the code make sense to whoever
may be looking at this code, heres my description of this game, "Super
Killer Attack Llamas."

The new game, tentatively titled Super Killer Attack Llamas, is kinda
like a cross between Space Invaders and Yars Revenge, i guess...
basically the player is Good Llama, at the bottom of the screen, and
they're fighting Bad Llama at the top of the screen. Bad Llama is
shooting down at Good Llama, who has a few playfield objects to hide
behind, and must use the cover to shoot up at Bad Llama... that's
really it. Bad Llama occupies 10 scanlines and Good Llama occupies 10
scanlines, and they both can only move horizontally, so there's no
need to Vertical positioning because they will -always- be on those

I've pored over this code several times, and can't find what's wrong
with it at all.

~ kevin

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