https://bugs.freedesktop.org/show_bug.cgi?id=99850
Bug ID: 99850
Summary: Tessellation bug on Carrizo
Product: Mesa
Version: unspecified
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/Gallium/radeonsi
Assignee: dri-devel@lists.freedesktop.org
Reporter: tom.stde...@amd.com
QA Contact: dri-devel@lists.freedesktop.org
Created attachment 129692
--> https://bugs.freedesktop.org/attachment.cgi?id=129692&action=edit
carrizo run with HEAD
Tessellation is broken on Carrizo (A12-9800) hardware and apparently has been
for a while. The offending commit is
commit a4e2146a9d24592ed7e3bf778e3c21c6cfb89330
Author: Bas Nieuwenhuizen <b...@basnieuwenhuizen.nl>
Date: Mon May 2 14:55:52 2016 +0200
radeonsi: Use buffer loads and stores for passing data from TCS to TES.
We always try to use 4-component loads, as LLVM does not combine loads
and they bypass the L1 cache.
We can't use a similar strategy for stores and this is especially
notable with the tess factors, as they are often set with separate
MOV's per component in the TGSI.
We keep storing to LDS and the LDS space, so we can load the outputs
later, either due to the shader, of for wrting the tess factors.
Signed-off-by: Bas Nieuwenhuizen <b...@basnieuwenhuizen.nl>
Reviewed-by: Nicolai Hähnle <nicolai.haeh...@amd.com>
Reviewed-by: Marek Olšák <marek.ol...@amd.com>
I found it via running Unigine-Heaven with tessellation enabled.
The bug doesn't occur on other VI hardware (Polaris10, FIJI).
I can confirm that the HEAD~ commit leads to spec/arb_tessellation_shader/*
tests (in piglit) passing compared to running with HEAD.
--
You are receiving this mail because:
You are the assignee for the bug._______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
