a9bf82ecf4
Emulate perspective interpolation of depth for programmable ps fog ff ps fog uses position z, or 1/w depending on the ff projection matrix set. This is according to public documents found describing the algorithm and tests we made. In the case of programmable ps, we used position's z, which was sufficient to pass wine tests (which test shaders don't set w). Issue https://github.com/iXit/Mesa-3D/issues/315 showed that this calculation was wrong. Using perspective interpolation on z, that is using z * 1/w seems to satisfy both this application and wine tests. Fixes: https://github.com/iXit/Mesa-3D/issues/315 Signed-off-by: Axel Davy <davyaxel0@gmail.com>
`Mesa <https://mesa3d.org>`_ - The 3D Graphics Library
======================================================
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