From b0a8bb642f919eaa0c36b9d861c47e0cc4a99440 Mon Sep 17 00:00:00 2001
From: davidovski <david@davidovski.xyz>
Date: Mon, 22 Apr 2024 17:32:17 +0100
Subject: use grass

---
 shaders/bloom.kage | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 shaders/bloom.kage

(limited to 'shaders/bloom.kage')

diff --git a/shaders/bloom.kage b/shaders/bloom.kage
new file mode 100644
index 0000000..fc987b1
--- /dev/null
+++ b/shaders/bloom.kage
@@ -0,0 +1,43 @@
+//go:build ignore
+//kage:unit pixels
+
+package main
+
+const THRESHOLD = .9
+const DIRECTIONS = 30.0  // BLUR DIRECTIONS (Default 16.0 - More is better but slower)
+const QUALITY = 12.0      // BLUR QUALITY (Default 4.0 - More is better but slower)
+const SIZE = 5.0         // BLUR SIZE (Radius)
+const PI = 6.28318530718 // Pi*2
+const OPACITY = 0.21
+
+
+var Time float
+var NoiseOffset float
+
+func Fragment(dstPos vec4, srcPos vec2, color vec4) vec4 {
+    uv := srcPos
+    
+    average := vec3(0.0)
+    radius := SIZE / 2
+    
+    amount := 0.0
+    for d:=0.0; d<PI; d+=PI/DIRECTIONS{
+		for i:=1.0/QUALITY; i<=1.0; i+=1.0/QUALITY{
+            t := imageSrc0UnsafeAt(uv + vec2(cos(d),sin(d))*radius*log(i)).rgb
+
+            brightness := dot(t.rgb, vec3(0.2126, 0.7152, 0.0722))
+            if brightness > THRESHOLD {
+                average += t
+                amount += 1.0
+            }
+        }
+    } 
+    
+    col :=  imageSrc0UnsafeAt(uv).rgb
+    if amount > 0 {
+        col += (average / amount) * OPACITY
+    }
+    
+    return vec4(col,1.0)
+}
+
-- 
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