tree c8437c3f73d4dc9c80a4ca979228106f04ec14be
parent 823ca85404fb67037c0ecc68481fb59aa232196c
author Chris Forbes <chrisforbes@google.com> 1551481825 -0800
committer Chris Forbes <chrisforbes@google.com> 1551719872 +0000

Fix culling to match Vulkan convention

Correct the sign of the area calculation. The front facing determination
can then be written to exactly match the spec -- CCW means positive area
is front facing.

Change-Id: Ibed3e26b0cf77030325044c7dc9e818264a8750d
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/26009
Tested-by: Chris Forbes <chrisforbes@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>