Weizhen Huang
21ca47d81f
1. move early-out logic even earlier 2. reduced the scope of some variables 3. return `label` at the end of `bsdf_microfacet_sample()`. Return `LABEL_NONE` in the invalid case. The previous distinction was unnecessary because samples with zero contribution are assigned with `LABEL_NONE` in `integrate_surface_bsdf_bssrdf_bounce()` anyway.
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