USDView - OpenColorIO 2 GPU support incomplete

[remia]

It seems that the support for OCIO v2 (from b08e77f) is currently broken as it's trying to use the new GPU path (via getDefaultGPUProcessor()) but fail to then setup all the resources required (there is now an arbitrary number of 1D and 3DLUTs to query). While in may work on LUTs free config like the newer ACES configs, it will break on other configs. This was also discussed in #1386 I believe.

A quick fix could be to use the Legacy GPU Processor in v2.0.1, then potentially migrate to a v2 compliant GPU path, an example being available in Python here.

[sunyab]

Filed as internal issue #USD-7460

[spiffmon]

Thanks for filing, @remia . Pixar has not yet transitioned to 2.x, and we accepted the referenced PR with the understanding that we couldn't yet really validate or support it. We would consider a further PR that completes the work, though!

[creijon]

I've put a PR with OCIO 2.1.1 GPU support for Metal and OpenGL here: #1936