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I was working on another game for Kouga Software that never got completed... The initial concept was a vertical scrolling shooter heavily inspired by an Atari XL game called 'The Dreadnaught Factor'. This basically involved going up against giant spaceships, attempting to take out all their gun turr...

That's just pure genius. You only use your powers for good, right?

Thanks tormod, I'm such a n00b. I've now updated the attachment to my earlier post. There is a new source and Dragon binary that updates at 50fps. The animation isn't as varied as the original but there might be a parameter tweak in there somewhere that gives a better effect. The screen drawing rout...

I have some ideas that probably work better in my head than in reality :D I was thinking some data could be precalculated to allow one level of lookup to be removed, but I suspect the resulting animation won't be as complex. It might be useful for something though. I don't wish to abuse the board by...

sixxie wrote:Something like this? http://www.6809.org.uk/tmp/plasma-new.s

Nicely done sir! Self modding code on the pointers has really streamlined it.

Now all we need to do is pull another optimisation out the bag and double the speed again

Yep, that kind of thing. As you point out, the same thing can be done with the y reg to get rid of the addb #2 which in turn means the t41 line can be moved out. Other observations: I redeclared the pos and neg halves of each table as macros just to make it easier to specify the doubled up tables, t...

Cheers!

I think I must be doing something wrong. So far I've been refused to attach .s, .bin and .txt files. Off to the FAQ I go...

Love this plasma effect guys - great job! I've done some cooking of my own for even more speed :) The additions in the inner loop can be removed by manipulating the table pointers before each line. The tables have to be doubled up but it's worth it for the speed boost. Just wondering where best to s...