Adding a 3D LUT (.cube file) to a MTLTexture?

[latenitefilms]

Checklist

• I've read the README
• I've searched for existing GitHub issues

I am currently playing around with FxPlug - the effects engine for Apple's Final Cut Pro and Motion.

I am currently exploring if I can use MetalPetal to apply a 3D LUT (i.e. a .cube file) to a MTLTexture in Swift.

It looks like I might be able to use MTIColorLookupFilter() to apply a LUT - but it looks like it only accepts a LUT as a MTIImage - not a LUT file.

So I'd need to use something like CocoaLUT to convert the LUT file into an image. It looks like CocoaLUT can also generate Core Image Filters (VVLUT1DFilter / CIColorCube) from LUTs.

Have anyone played with using file-based LUTs with MetalPetal? Any words of wisdom?