From 294e8bb07ab5635118e9428901c1e92a478c29b0 Mon Sep 17 00:00:00 2001
From: Silas Bartha <silas@exvacuum.dev>
Date: Thu, 13 Jun 2024 20:40:46 -0400
Subject: Adaptive Outline

---
 assets/shaders/outline_post_process.wgsl | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

(limited to 'assets')

diff --git a/assets/shaders/outline_post_process.wgsl b/assets/shaders/outline_post_process.wgsl
index 79c116f..5e0bf9c 100644
--- a/assets/shaders/outline_post_process.wgsl
+++ b/assets/shaders/outline_post_process.wgsl
@@ -3,9 +3,7 @@
 struct OutlinePostProcessSettings {
 	weight: f32,
 	threshold: f32,
-#ifdef SIXTEEN_BYTE_ALIGNMENT
-	_padding: vec2<f32>,
-#endif
+    adaptive: u32,
 }
 
 @group(0) @binding(0) var screen_texture: texture_2d<f32>;
@@ -39,7 +37,11 @@ fn fragment(
 
     let delta_clipped = clamp((delta_raw * 2.0) - settings.threshold, 0.0, 1.0);
 
-    let outline = vec4f(delta_clipped, delta_clipped, delta_clipped, 0.0);
+    var outline = vec4f(delta_clipped, delta_clipped, delta_clipped, 0.0);
+    let luma = (0.2126 * screen_color.r + 0.7152 * screen_color.g + 0.0722 * screen_color.b);
+    if settings.adaptive != 0 && luma < 0.5 {
+        outline = outline * -1;
+    }
 
     return screen_color - outline;
 }
-- 
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