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