New demo uploaded: Pirate Kingdoms

rje · Post by **rje** » Fri Feb 25, 2022 4:52 am

On 1/26/2022 at 9:36 AM, SlithyMatt said:

Mainly, you need to make sure you are doing the scrolling during VBLANK by putting it at the beginning of your VSYNC interrupt routine. That should clean it up a lot.

It doesn't work. By that I mean it DOES work, but C is so slow it reduces the game to a crawl.

The function I tried using is called waitvsync(), strangely enough. Standard with cc65's <cbm.h>.

rje · Post by **rje** » Fri Feb 25, 2022 4:53 am

On 1/28/2022 at 10:10 PM, ZeroByte said:

I forget exactly every step I did in Flappy Bird, but it does IRQ handling in C.

Basically, I made a #define that makes the IRQ vector in RAM ($030-something) so it looks like a variable, and then I did an inline assembly to SEI, then IRQ_VECTOR = &irq_handler;

Something akin to that.

THAT might work. Better than waitvsync() anyhow.

rje · Post by **rje** » Fri Feb 25, 2022 4:53 am

I'm impatient now though, and I want to get on with writing some playable content to the game.

Ed Minchau · Post by **Ed Minchau** » Fri Feb 25, 2022 6:24 am

Got any images to show?