how to find a supported texture format

[jwwalker]

Is there a way to find a supported texture format other than just trying everything? I'm looking for an RGB format for Mac/Metal, and so far I've found that RGB8UI, RGB8I, RGB32UI, RGB32I, and RGB32F are unsupported.

[bejado]

For Metal at least, you can check here:

filament/filament/backend/src/metal/MetalEnums.h

Line 129 in 00f50c5

inline MTLPixelFormat getMetalFormat(TextureFormat format) noexcept {

Metal doesn't support 3-component textures natively.

[jwwalker]

I was assuming that it would be asking for trouble to use a format with alpha if I'm not actually going to use alpha. Is it safe to use an RGBA format and just let the alpha channel take up space without doing anything?

[romainguy]

Yes. And because of alignment reasons RGB formats are often expanded to RGBA internally anyway.