PBR Neutral tone mapper
The PBR Neutral tone mapper is a new method to map HDR colors to the [0-1] range.
The implementation is adapted from Khronos official code.
Read about the tone mapper here: https://modelviewer.dev/examples/tone-mapping
Also see https://github.com/KhronosGroup/ToneMapping/blob/main/PBR_Neutral/README.md#pbr-neutral-specification