From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 8 May 2021 17:33:57 +0000 (+0300)
Subject: Take ambient occlusion samples only from the forward hemisphere
X-Git-Url: http://git.tdb.fi/?a=commitdiff_plain;h=28965eccb61d06a497645e0770826de161b0e4cb;hp=28965eccb61d06a497645e0770826de161b0e4cb;p=libs%2Fgl.git

Take ambient occlusion samples only from the forward hemisphere

This requires a few more samples from the depth buffer to determine the
normal, but that should not be an issue with today's GPUs.

Also generate the sample points for cosine-weighted importance sampling
to obtain physically correct occlusion values.
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