Improved 400+ color palette demo

[blargg]

I just improved my 400+ color palette demo to not shake (well, it shakes by two pixels, but at 30 Hz, so it's much less noticeable). Cleaner, easier-to-follow code is included, rather than the super-optimized code like in the previous version. NTSC-only at the moment:

full_palette.zip

[cpow]

I just improved my 400+ color palette demo to not shake (well, it shakes by two pixels, but at 30 Hz, so it's much less noticeable). Cleaner, easier-to-follow code is included, rather than the super-optimized code like in the previous version. NTSC-only at the moment:

full_palette.zip

Man, that is WHACK!

[tokumaru]

I find it funny that the first image is full of harmony and looks very clean, while the second one looks like a TV with really bad interference, even though they are composed by the same rows, just arranged differently (the JPEG artifacts don't help, but both images have them)...

[Disch]

I'm not hip with all the goovy jive you kids use these days, but isn't "whack" a negative term?

[Dwedit]

So is "Bad", but that didn't stop anyone.

[Drag]

So is "Bad", but that didn't stop anyone.

Man, I love the power glove.

[tepples]

Man, I love the power glove.

Why, Lucas? Is that what lets you PK freeze Jimmy Woods's hands?

[blargg]

Yeah, the left image looks more vibrant and clean, but doesn't really show how smooth a gradient you get. You are left wondering whether some colors are repeated. The right one makes it very clear that this isn't just showing 52 colors or something puny.

[tepples]

A to switch: is that possible?

[blargg]

Sure, but unless I can make the inner loops similar enough to be switched based on a variable, it would involve having both loops in the code, and thus more complexity. It's already complex enough to follow as it is. I'll take a look though, since it would be nice to have one ROM.

I came across your vertical stretch demo where you blend lines via flickering. I realized that this would benefit the smooth gradient version of this palette demo. Since it already shakes horizontally at 30 Hz, effectively blending the vertical edges, I could have it shake vertically as well, blending it all together more.

[tepples]

Sure, but unless I can make the inner loops similar enough to be switched based on a variable, it would involve having both loops in the code, and thus more complexity. It's already complex enough to follow as it is.

For each mode, make a 32-entry table of tints and a 32-entry table of starting colors. Order them in ROM as normal_tints, smooth_tints, normal_startcolors, smooth_startcolors. Then display entries 0-31 or 32-63 of each table.

[blargg]

I put up a nice page on the Wiki describing how this demo works, and updated the source code to be cleaner and easier to follow. Unfortunately, I didn't put in controller control of alternating between two palettes, as it would have complicated the code more than it was worth.

[bucky o'hare]

Wasn't there an animated demo posted with the noise channel making 'wave' sounds? Was that posted elsewhere or was it taken down?

I could've sworn it was in this thread!

[blargg]

Yeah, but it's in for a big upgrade. Stay tuned...

[Bregalad]

Well Blargg, congratulation for this demo which was implemented in an incredibly clever way.
If I understand way, you managed to get completely rid of all jittering (or get only 1 pixel jitter I haven't understood exacly).
How did you manage this exploit ? I always got ~9 pixels (3 CPU clock) jittering at best (NTSC).