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shell-glsl-quad: Set the pipeline blend string explicitly

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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
This commit is contained in:
Rui Matos 2015-10-03 21:21:24 +02:00
parent 464d5d8a13
commit 44047ac881
1 changed files with 1 additions and 0 deletions
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1
src/shell-glsl-quad.c
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@ -139,6 +139,7 @@ shell_glsl_quad_constructed (GObject *object)
if (G_UNLIKELY (klass->base_pipeline == NULL))
{
klass->base_pipeline = cogl_pipeline_new (ctx);
cogl_pipeline_set_blend (klass->base_pipeline, "RGBA = ADD (SRC_COLOR * (SRC_COLOR[A]), DST_COLOR * (1-SRC_COLOR[A]))", NULL);
if (klass->build_pipeline != NULL)
klass->build_pipeline (self);