https://bugs.freedesktop.org/show_bug.cgi?id=108641
--- Comment #3 from steelwinged@gmail.com --- Situation still occurs on Mesa 19.1.3, refreshed RenderDoc capture at https://www47.zippyshare.com/v/fL6gXv7u/file.html
I might be conflating things, but there's also a shader scheduling error:
##post_scheduler: unscheduled pending instructions :MOV R27.x.5@R1.w, R17.x.1@R1.x MOV R27.x.3@R1.y, R17.w.1@R0.z MOV R17.x.1@R1.x, A9.y[R16.x.1@R0.w]_73F@R1.y rels: A9.y[R16.x.1@R0.w]_73F@R1.y : <= R9.y.1F, R10.y.1F, R11.y.1F, R12.y.1F, R13.y.1F, R14.y.1F MOV R17.w.1@R0.z, A9.x[R16.x.1@R0.w]_62F@R1.x rels: A9.x[R16.x.1@R0.w]_62F@R1.x : <= R9.x.1F, R10.x.1F, R11.x.1F, R12.x.1F, R13.x.1F, R14.x.1F MOV R14.y.1F, 4.2039e-45|00000003 MOV R13.y.1F, 4.2039e-45|00000003 MOV R12.y.1F, 7.00649e-45|00000005 MOV R11.y.1F, 5.60519e-45|00000004 MOV R10.y.1F, 4.2039e-45|00000003 MOV R9.y.1F, 4.2039e-45|00000003 FLT_TO_UINT R16.x.1@R0.w, C4102.x MOV R14.x.1F, 1.4013e-45|00000001 MOV R13.x.1F, 0|00000000 MOV R12.x.1F, 0|00000000 MOV R11.x.1F, 0|00000000 MOV R10.x.1F, 5.60519e-45|00000004 MOV R9.x.1F, 7.00649e-45|00000005
I don't read mnemonics, but I'm guessing that could be "Shader 9120" from the capture, which also causes the interlacing lines. I'm attaching it shortly.