Swapping around preloaded tile CGRAM colours per scanline?

So, I know you typically have a background layer that uses multiple preloaded CGRAM palettes and pick whichever one on a per-tile basis--if I use Mode 0 as the example here then it would actually be eight palettes per layer with three visible colours per tile--but how costly would it be to swap around a different one or more of the preloaded eight palettes down the screen for a bit more colour fidelity on a per-scanline basis than the normal per-tile-height palette restriction?

Effectively, I'm thinking that each tile could use up to all eight preloaded palettes in Mode 0 by switching to one of the others on each scanline if desired, so long as it's not that CPU and resource costly obviously.

I'm just asking this because I've seen some discussions around [H}DMA loading in multiple brand new CGRAM palettes per scanline for a lot more colour fidelity in whatever background mode, and I know that it takes quite a bit of the SNES' available resources to do that per scanline and it can't even change enough colours to replace all of them per scanline anyway, so I was just thinking of a hopefully much simpler option to use for whatever effect, which I think might be quite useful in Mode 0 with its particular per-tile BG colour restrictions.

Statistics: Posted by SNES AYE — Sun Jun 23, 2024 5:19 am — Replies 6 — Views 204

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