Rui Matos 44047ac881 shell-glsl-quad: Set the pipeline blend string explicitly
The default pipeline color is opaque white and blending is turned
off. If we only draw with that color (e.g. because animations are
disabled and we're always drawn with opacity == 255), blending is kept
disabled since cogl_pipeline_set_color() returns early if the color
doesn't change from what was there before.

In our case we always want blending to be enabled which we can achieve
by setting the blending string ourselves.

https://bugzilla.gnome.org/show_bug.cgi?id=755827
2015-10-08 18:27:07 +02:00
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