Hash :
d55d283c
Author :
Date :
2015-10-27T13:59:19
Add a test for flat shader 'provoking vertex'. The provoking vertex, or leading vertex, is the vertex in a triangle which produces the value that gets used for a flat-shaded triangle. Flat shading means the same value gets used for the entire triangle. It seems as though D3D and OpenGL have different definitions of which vertex is the leading/provoking one; GL says it is the *last* vertex of a primitive, while while D3D says it is the first. Additional complexity comes about from triangle strips, which switch winding order, and primitive restart, which defines new primitives in the middle of prior primitives. BUG=angleproject:754 Change-Id: If1217cba33dabf3b1e4ad13fd639d049cb16fe44 Reviewed-on: https://chromium-review.googlesource.com/309152 Reviewed-by: Corentin Wallez <cwallez@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Tested-by: Jamie Madill <jmadill@chromium.org>