From ec4017bb0ff221c5c3e192a165c8d60a54f3bedc Mon Sep 17 00:00:00 2001
From: ccolin
Date: Sun, 3 Jan 2021 17:10:26 +0100
Subject: highlight colliding drones

---
 shaders/main.frag | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'shaders/main.frag')

diff --git a/shaders/main.frag b/shaders/main.frag
index 7120521..f69789c 100644
--- a/shaders/main.frag
+++ b/shaders/main.frag
@@ -3,6 +3,7 @@ varying vec2 uv;
 varying vec3 frag_pos;
 
 uniform sampler2D tex;
+uniform bool highlight;
 
 void main() {
 	vec3 light_col = vec3(1, .964, .783);
@@ -12,5 +13,10 @@ void main() {
 	float diff = max(dot(normalize(norm), light_dir), 0.0);
 	vec3 diffuse = diff * light_col;
 
-	gl_FragColor = texture2D(tex, uv) * vec4(ambient + diffuse, 1);
+	vec4 col = texture2D(tex, uv) * vec4(ambient + diffuse, 1);
+
+	if (highlight) {
+		col = mix(col, vec4(1, 0, 0, 1), .5);
+	}
+	gl_FragColor = col;
 }
-- 
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