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I've made some progress with lossy compression. The tree part is not finished yet, just the quantization / caching is working right now. Here's a test video with 256x224 pixels, and 1400 frames compressed into 2 Megabytes. VRAM upload needed is mostly around 3 to 4 kilobytes per video frame. Origin...

I figured out how to do the stuff Tepples mentioned without taking up CPU performance. Use mode 1. BG1 is filled with 4x4 solid color squares of 16 colors, BG2 is filled with another set of 4x4 solid color squares. BG3 is filled with a 1bpp bitplane (the way the sPPU is set up makes this easy) with ...

frames 0-1: upload frame A frame 2: upload end of frame A, and beginning of frame B. frames 3-4: upload rest of frame B. No, it doesn't work like that. You can't upload the end of frame A at frame 2 if the timing happens to be such you already had to display it. And with only 64kb VRAM, you can't k...

I was thinking color cell compression (allowing up to two out of 16 colors per 4x4-pixel area) at 120x80 pixels (letterboxed) and 12 fps. Disney movies were animated on twos, and the N64 Resident Evil game made graphics smaller to fit. For bitrate, color cell compression would give 120*80/4/4=600 q...

http://forums.nesdev.com/viewtopic.php?f=21&t=14807

I don't know what happened to the pictures, but this thread has something relevant to what I'm talking about.

If I'm doing a music video from a Disney animated movie, I would need to have 24fps, which, if I'm doing a fullscreen 256x224 4bpp, I've calculated that I would have roughly 13kB or 416 8x8 tiles per animation frame. That means tiles would have to be duplicated to fill up the screen. I want to know ...

10 differences between the two both versions: https://www.youtube.com/watch?v=IDavVuWsodc What kind of overclocked bullshit emulator are they using where the original game DOESN'T lag with 32 rings + swinging platform + spikes? Even if the guy pulls this off on the SNES, the people making the video...

if you could update the span buffers to be 8 tall and hence you go through a whole "tile"s worth at once, it might work out faster to plot custom chars, update the map and then DMA fill with known solid tiles. It would save DMA bandwidth but I'm not sure it wouldn't cost more in terms of rasterise ...

I eventually want to make a homebrew game that utilizes the SA-1 chip, but I will have to use it creatively, and not just preventing slowdown.

I mean solid as in the 8x8 tile is one solid color, and update the tilemap as well as the tiles.

You'll cut down on bandwidth a lot by only updating the non-solid tiles.

TiagoSC wrote: ↑

Tue Aug 11, 2020 3:59 pm

psycopathicteen wrote: ↑

Sun Aug 09, 2020 10:51 am

What animation frames are missing? They looked the same to me.

The missing animation frames are from enemies Crabmeat and Neutron,
and some sprites that use backdrop tiles.

How did the original game do the semi-transparent sprite?

What animation frames are missing? They looked the same to me.

Dang, this is impressive. I didn't even notice any slowdown.

I remember reading about something similar happening in a Sega Genesis game (It was either Altered Beast, or Street Fighter II) where the samples themselves sounded good, but there was a glitch in the sound driver that distorted the samples. I think it was an issue with the Z80 getting stuck during ...