glsl-effect: Don't overwrite the framebuffer's alpha/X channel
It's a waste of effort and will also taint screenshots if they accidentally store that channel as alpha. Fixes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/6389 Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2650>
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@ -119,7 +119,7 @@ shell_glsl_effect_constructed (GObject *object)
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if (G_UNLIKELY (klass->base_pipeline == NULL))
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{
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klass->base_pipeline = cogl_pipeline_new (ctx);
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cogl_pipeline_set_blend (klass->base_pipeline, "RGBA = ADD (SRC_COLOR * (SRC_COLOR[A]), DST_COLOR * (1-SRC_COLOR[A]))", NULL);
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cogl_pipeline_set_blend (klass->base_pipeline, "RGB = ADD (SRC_COLOR * (SRC_COLOR[A]), DST_COLOR * (1-SRC_COLOR[A]))", NULL);
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if (klass->build_pipeline != NULL)
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klass->build_pipeline (self);
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