Created attachment 126603 [details]
Viewport corruption

Unreal Engine 4.13.1 editor shows corrupted preview viewports when at least one
of the following post-processing effects is active in a viewport:
* Motion Blur
* Tonemapper

A screenshot of a viewport segment is attached.

When both effects are turned off, viewports appear to render correctly.


Graphics card: AMD TONGA chipset (Radeo R9 380)
Mesa version: 12.1~git1600917222200.073129c~x~padoka0 on Ubuntu 16.04 with
Padoka PPA
glxinfo:
  OpenGL core profile version string: 4.3 (Core Profile) Mesa 12.1.0-devel -
padoka PPA
  OpenGL version string: 3.0 Mesa 12.1.0-devel - padoka PPA
  OpenGL ES profile version string: OpenGL ES 3.1 Mesa 12.1.0-devel - padoka
PPA