Blender Git Loki

Fix T60171: Hair Particles Not Displaying in Viewport

This patch fixes T60171 by adding a dummy read from the `dummy` vertex attribute to `hair_get_pos_tan_binor_time` in `common_hair_lib.glsl`. Confirmed to work on my machine (macOS 10.14.4 Beta, Radeon R?9 M295X).

According to my experiments regarding this issue, the problem is triggered when all of the following conditions are met: (a) the shader has no vertex reads; (b) the index buffer is ? 256KiB. I can't really give an explanation of this misbehavior because of the video driver's closed-source nature.

Reviewers: fclem

Reviewed By: fclem

Subscribers: zeddb

Maniphest Tasks: T60171

Differential Revision: https://developer.blender.org/D4490