Discolored | Colorize Discord 's boring SVGs | Theme library

To answer your questions:

How can I specify an RGB format with 3 bytes per pixel without an alpha?

There are no texture formats that fit your description. There are packed 32-bit formats that make use of greater precision, but there are no formats that have 8 bits per channel and fit into 24 bit, because these 24 bit formats don't fit well with modern hardware anyway.

Can I somehow specify a custom format instead of one of the default formats?

Not really, textures are handled by a hardware unit called TPU and you can't really come up with your own texture format

I would be using 1 8 bit per pixel texture for each of the three RGB channels of the each complete texture?

I would strongly recommend against that, because there is actually a texture cache and if you are sampling three different textures at the same texture coordinates, it doesn't know how to correlate them and you will end up with a performance hit.

Instead, you have three options.

First option is kinda hard to do cause you need a lot of infrastructure. You can either use compressed formats like ASTC or BCn. To learn more about that, there's an upcomming talk in this years WWDC2021 called Discover Metal debugging, profiling, and asset creation tools that will post on Wednesday.

Second option is to use a spare channel for some useful information, like occlusion, or some sort of mask, or anything domain-specific to your game.

Third option is just to use 32-bit formats with 8 bits per channel and just ignore the alpha or populate it with 0 or 1 as you wish. This is the easiest option and I would recommend going with it before advancing to other options.

The problem is that the value is shuffled in the play again function, but not in the Game() function.

What you probably should do is this: