From 16f9ce1f005cd2d7c482722b961358d8f209bb83 Mon Sep 17 00:00:00 2001
From: yuzu-eva <stevenhu@web.de>
Date: Mon, 16 Dec 2024 20:59:26 +0100
Subject: initial commit

---
 shaders/smear.fs | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 shaders/smear.fs

(limited to 'shaders/smear.fs')

diff --git a/shaders/smear.fs b/shaders/smear.fs
new file mode 100644
index 0000000..0f7c316
--- /dev/null
+++ b/shaders/smear.fs
@@ -0,0 +1,27 @@
+#version 330
+
+// Input vertex attributes (from vertex shader)
+in vec2 fragTexCoord;
+in vec4 fragColor;
+
+// Output fragment color
+out vec4 finalColor;
+
+void main()
+{
+    float radius = 0.25;
+    vec2 distance_from_center = fragTexCoord - vec2(0.5);
+// s <= 0 -> inside circle
+// s > 0  -> outside circle
+    if (length(distance_from_center) <= 0.5) {
+        float s = length(distance_from_center) - radius;
+        if (s <= 0) {
+            finalColor = fragColor*1.25;
+        } else {
+            float t = 1 - (s / (0.5 - radius));
+            finalColor = vec4(fragColor.xyz, t);
+        }
+    } else {
+        finalColor = vec4(0);
+    }
+}
-- 
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