tree 6e105d5dbb0dd8a7c10c903c14c3c9e9bcfd3bd0
parent 9bdd64de4681b01a9d026f9ca0960e089a8f3ef6
author Chia-I Wu <olv@google.com> 1538590212 -0700
committer Chia-I Wu <olv@google.com> 1538681182 -0700

renderengine: clamp XYZ to [0.0, 1.0] in shaders

texture2D can return strange negative values for some YUV textures.
That should be a driver bug.  But with scRGB and floating-point
formats, we cannot be sure that colors will always stay non-negative
after conversion to XYZ.  We need to clamp XYZ to [0.0, 1.0] such
that the following color processing behaves as expected.

Bug: 116864006
Test: manual
Change-Id: I8f432c63b800edc11ce3d86536192a5547144ca5