We were waiting for programs from both queues to be compiled before
calling the callback associated with one queue. In practice this caused
the callback associated with high priority programs to be called only
after low priority programs were ready.
Also cleanup-up "token" so that it doesn't store the priority.
Update the documentation and sample to better reflect what the
implementation does.
It supports KHR_parallel_shader_compile as well as a
thread pool of GL contexts.
- we have a new 2-priorities queue for shader compilation
- use this feature in gltfio in the ubershader case
* Fix a crash by setting not exist material parameters on ubershader
* gltfio: add getFeatureMap, remove logic for dummy textures
Co-authored-by: Philip Rideout <philiprideout@gmail.com>
