[Bug 101596] Blender renders black UI elements

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101596

--- Comment #4 from Matias N. Goldberg <dark_sylinc at yahoo.com.ar> ---
+1
I get this error too.

This bug is NOT https://bugs.freedesktop.org/show_bug.cgi?id=97059 which gets
fixed by either using DRI2 or selecting Triple Buffer in Blender.

This error started after I pulled latest git; and a faster way to reproduce it
is to simply click on the Materials pane; where automatically everything starts
going wrong within Blender.

I tried debugging the problem but came out short. My guess was either in the
vertex shader's key.clamp_color would become true for the same variant where it
used to be false, or that the same would happen in the pixel shader with
clamp_color/persample_shading/ati_fs/external (i.e. test if any of
st_fp_variant_key members changed but the same variant was being used).

However all shaders appear to be using consistent settings, which leaves me
puzzled.

As Sebastian Parborg, undoing the changes "st_update_fp" fixes the problem.

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