https://bugs.freedesktop.org/show_bug.cgi?id=99154
Bug ID: 99154
Summary: Link time error when using multiple builtin functions
Product: Mesa
Version: git
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: glsl-compiler
Assignee: mesa-dev@lists.freedesktop.org
Reporter: niels_...@salscheider-online.de
QA Contact: intel-3d-b...@lists.freedesktop.org
Created attachment 128570
--> https://bugs.freedesktop.org/attachment.cgi?id=128570&action=edit
Simple test case
When using multiple builtin functions, linking of a shader can fail if
temporary variables of the GLSL compiler collide.
builtin_builder::binop creates variables named "x" and "y" for the parameters
of builtin functions. Later, ir_call::generate_inline inlines the call to the
builtins. It clones the variables (without changing the name) and assigns the
function inputs to them.
This can cause a collision of variable names, e. g. when using multiple builtin
functions with parameters of different types. The attached test case can be
used to reproduce the problem.
I can work around the problem by adding a sequence number and possibly a prefix
to the variable names but I am not sure if that is the correct solution.
Thanks to imirkin and robclark for helping me to figure this out on IRC.
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