From 53c6af5b2113ca2b1fa45d2e4ecb9f705325af93 Mon Sep 17 00:00:00 2001
From: Victoria Brekenfeld <victoria@system76.com>
Date: Thu, 1 Jun 2023 17:03:55 +0200
Subject: [PATCH] shaders: Premultiply alpha

---
 src/backend/render/mod.rs | 13 +++++++++++--
 src/shell/workspace.rs    |  2 +-
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/src/backend/render/mod.rs b/src/backend/render/mod.rs
index 370427c0..129d33c3 100644
--- a/src/backend/render/mod.rs
+++ b/src/backend/render/mod.rs
@@ -217,7 +217,10 @@ impl IndicatorShader {
                 None, //TODO
                 alpha,
                 vec![
-                    Uniform::new("color", color),
+                    Uniform::new(
+                        "color",
+                        [color[0] * alpha, color[1] * alpha, color[2] * alpha],
+                    ),
                     Uniform::new("thickness", thickness),
                     Uniform::new("radius", radius as f32),
                 ],
@@ -293,7 +296,13 @@ impl BackdropShader {
                 geo,
                 None, // TODO
                 alpha,
-                vec![Uniform::new("color", color), Uniform::new("radius", radius)],
+                vec![
+                    Uniform::new(
+                        "color",
+                        [color[0] * alpha, color[1] * alpha, color[2] * alpha],
+                    ),
+                    Uniform::new("radius", radius),
+                ],
             );
             cache.insert(key.clone(), (settings, elem));
         }
diff --git a/src/shell/workspace.rs b/src/shell/workspace.rs
index 84d5ee15..dc54b3d8 100644
--- a/src/shell/workspace.rs
+++ b/src/shell/workspace.rs
@@ -634,7 +634,7 @@ impl Workspace {
                         self.backdrop_id.clone(),
                         zone,
                         0.,
-                        alpha * 0.65,
+                        alpha * 0.85,
                         [0.0, 0.0, 0.0],
                     ))
                     .into(),