MagicEngine

[Tomaitheous]

Ok, I got the transparency parts. The back ground with the water is static - drawn as part of the BG. The sprite palette($403 is set to $01) is changed on five RCR interrupts with 3 colors updated at a time. The RCR is aligned to top of the back ground water.
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[Paranoia Dragon]

Would you say that it is the best transparency effect you've seen on the Turbo? And are you going to duplicate the effect in some kind of demo
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[Tomaitheous]

Hmm. There aren't a lot of transparency effects or games that use them on the Turbo. Duplicating the effect for a sprite instead of the BG (water3.pce demo) would be pretty easy.

Doing it with HuC is another thing. You'd have to write a custome hsync interrupt routine, which would cause some of the internal functions of HuC to not work. Or maybe you could write a bit of logic in the hsync routine to jump to the HuC hsync code unless it falls on a specific RCR line(s), then it would execute user code.

It all depends on what the transparency effect is for. In an RPG, if I wanted the characters to have partial or full transparent shadow over them from a build or such, I'd probably keep a buffer in ram and overlay a mask to turn off bit of the last bitplane(3) and then upload the updated sprite. You'd have to limit the characters to 8 colors though. Or have two sprites - the underlying sprite with the darker/ligher/alt hue and the top sprite as normal. Masking out the same spot in all bitplanes would let the bottom sprite show through - alot of work, but your not limited to 8colors.

All the transparency effects have been flat model type - with the exception of the sprite silhouette trick. Doing semi-opaque pixel-by-pixel transparency really difficult. With a little clever coding, I shoud be able to reproduce the water stage effect from Phalanx on the SGX.

-Rich
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[ccovell]

[Tomaitheous]

Cool I'll PM you the details.
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[shubibiman]

Hi Thomaitheous, I posted a link of your demo on Necstasy (the forum), so that french fans can enjoy it too. I just wanted to let you know.

[Paranoia Dragon]

Do you think you might feel like making an example sometimes, or would it take too much effort? I know, for one particular game we're working on, that I can't talk about, we were going to try to do a wave of water passing by....something, with a transparency effect.
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[Tomaitheous]

Shubibman: Awesome

PD: I could write a demo, but to be honest it would really need to be customize to a specific scene or part of the game and that quite a few different ways to write it. It have to be done in ASM and it would be a clock cycle counting competition - possibly limiting the effect on the PCE to animation of 30fps or even 15fps. It all depends on... well everthing actually. There some other facters too, like if the game is running on SCD or ACD and how much buffer is set a side.

When you mean wave of water, do you mean a side view of a large swell? If you have some more specifics you can share, I could write a test demo - PM me if you're interested.
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[Paranoia Dragon]

[Tomaitheous]

I'll just post the rest of the VPC demos on this thread.

Here's VPC demo #2.

The readme.

[Paranoia Dragon]

Very nice! I wish it were that easy for the regular PCE, but, if that could even be done at all, I figure it'd take alot of work for an effect so drastic as that.
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[stevek666]

[shaneandriu]

He looked at the outline of the test and it seems Exchange timer to 240 online gambling 240 CPR to suspend the effect of transparency. I saw in Utopia forum had been frozen for some time.
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