Blender Git Loki

Unified renderer OSA sample clipping:

User info:
This change limits the contribution of any OSA sample to 1.0 per color
in the Unified renderer. Because color=1.0 gives fully saturated color,
samples contributing more than 1.0 were overweighted in the OSA average
causing aliasing (sometimes quite severe).

Samples can contribute more than 1.0 because a material's spec and refl
values are not normalized (In real world spec+refl <= 1.0). This solves
a large class of aliasing problems in the unified renderer.

Coder Info:
None.