From cf62deea98faf7e7e8a31c05d4d44c7d308374db Mon Sep 17 00:00:00 2001 From: Jeffy Chen Date: Fri, 5 Aug 2022 11:27:54 +0800 Subject: [PATCH 75/76] gl-renderer: Clear RGB when alpha is zero in fast path Signed-off-by: Jeffy Chen --- libweston/renderer-gl/fragment.glsl | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/libweston/renderer-gl/fragment.glsl b/libweston/renderer-gl/fragment.glsl index 4414b63..a90cbfa 100644 --- a/libweston/renderer-gl/fragment.glsl +++ b/libweston/renderer-gl/fragment.glsl @@ -253,8 +253,12 @@ main() /* Fast path for disabled color management */ if (c_input_is_premult) { - /* View alpha (opacity) */ - color *= alpha; + if (color.a == 0.0) { + color.rgb = vec3(0, 0, 0); + } else { + /* View alpha (opacity) */ + color *= alpha; + } } else { /* View alpha (opacity) */ color.a *= alpha; -- 2.20.1