| Priority | medium |
|---|---|
| Bug ID | 78161 |
| Assignee | nouveau@lists.freedesktop.org |
| Summary | [NV96] Artifacts in output of fragment program containing not unrolled loops with conditional break |
| Severity | normal |
| Classification | Unclassified |
| OS | Linux (All) |
| Reporter | gzregozrw@wp.pl |
| Hardware | x86-64 (AMD64) |
| Status | NEW |
| Version | git |
| Component | Drivers/DRI/nouveau |
| Product | Mesa |
Created attachment 98301 [details]
apitrace of simple test program.
Problem appear in shaders containing loops with conditional break when loop is
not unrolled by nouveau. I checked emitted code with ST_DEBUG=tgsi
NV50_PROG_DEBUG=1.
Tested with Mesa 10.2.0-devel (git-475f5ff) from 2014-04-30.
This bug exists for more than year, I first saw it in 2013-02.
I think that artifacts appear in areas where is big difference in number of
iterations executed for pixel before breaking from loop.