https://bugs.freedesktop.org/show_bug.cgi?id=91461
Bug ID: 91461
Summary: gl_TessLevel* writes have no effect for all but the
last TCS invocation
Product: Mesa
Version: git
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/Gallium/radeonsi
Assignee: dri-devel at lists.freedesktop.org
Reporter: daniel at constexpr.org
QA Contact: dri-devel at lists.freedesktop.org
The tessellator ignores all writes to gl_TessLevelInner and gl_TessLevelOuter
by the tessellation control shader except except those done by the last TCS
invocation (gl_InvocationID == patch output vertices - 1).
This results in no primitives being generated unless all entries of
gl_TessLevelOuter are written in that invocation (the 'initial' values seem to
be 0 for gl_TessLevelOuter and 1 for gl_TessLevelInner).
Additionally, barrier() does not synchronize changes to the gl_TessLevel*
between TCS invocations.
Neither of these problems can be reproduced with user-defined 'patch out'
variables - writes by any TCS invocation are visible in the evaluation shader
and barrier() makes them visible to the other TCS invocations.
GPU: Radeon HD 7950 (TAHITI)
Mesa: 10.7.0-devel (git-9deb614)
LLVM: r243203
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