https://bugs.freedesktop.org/show_bug.cgi?id=30152
--- Comment #6 from davide marsicanbear@gmail.com 2010-09-26 19:15:29 PDT --- Any news on this? Blur is still broken in kwin-4.5.1 on my mobility x700 using r300g from the latest mesa git..
(In reply to comment #5)
(In reply to comment #1)
There are lots of varyings. Just a guess - aren't there more vertex shader outputs than we can rasterize? We are currently limited to 8 generics.
KWin generates the source code for the blur shaders at runtime and should limit the number of varyings to GL_MAX_VARYING_FLOATS / 4.
So I don't think this is the explanation for why it's not working in KWin (although the piglit test I submitted obviously uses too many).
Anyway I'll submit another testcase that uses 8 varyings.