Porting glTF reference renderer code to Vulkan

[JoshKlint]

It appears this may be the cause:

How to generate Sheen E LUT

I am trying to generate some new IBL environments using glTF-IBL-Sampler (because the KTX2 textures in glTF-Sample-Environments won’t load with the latest KTX-Software/libktx as they appear to be an outdated format). I can get this to work, I compiled the source myself and the results look great. However I have one question. My shaders are mostly just slight modifications of the shaders in the glTF-Sample-Viewer and there is one LUT texture that I am basically just pulling from the sample viewe…