updated chromatic aberration shader to general function

Image-Filtering/Chromatic-Aberration/Image.glsl

@@ -1,24 +1,30 @@
-    
-const float Samples = 4.;
-const float Strength = 0.085; // 2.5%
-    
-void mainImage( out vec4 fragColor, in vec2 fragCoord )
-{
-    vec2 uv = fragCoord/iResolution.xy-.5;
-    vec3 col = vec3(0);
-    
-    vec3 f = 1. - length(uv) * Strength*vec3(2.,1.,0.);
-    
-    for (float i = 0.; i < Samples; i++)
-    {
-        vec3 fs = mix(f, vec3(1), i/Samples);
-        col += vec3(
-            texture(iChannel0, uv * fs.x+.5).r,
-            texture(iChannel0, uv * fs.y+.5).g,
-            texture(iChannel0, uv * fs.z+.5).b
-        );
-    }
-    col /= Samples;
-
-    fragColor = vec4(col,1.0);
+    
+const float Samples = 4.;
+const float Strength = 0.085; // 2.5%
+
+vec3 chromatic_aberration(in sampler2D tex, in vec2 uv)
+{
+    vec3 col = vec3(0);
+    
+    uv -= .5;
+    
+    vec3 f = 1. - length(uv) * Strength*vec3(2.,1.,0.);
+    
+    for (float i = 0.; i < Samples; i++)
+    {
+        vec3 fs = mix(f, vec3(1), i/Samples);
+        col += vec3(
+            texture(tex, uv * fs.x+.5).r,
+            texture(tex, uv * fs.y+.5).g,
+            texture(tex, uv * fs.z+.5).b
+        );
+    }
+    return col / Samples;
+}
+    
+void mainImage( out vec4 fragColor, in vec2 fragCoord )
+{
+    vec2 uv = fragCoord/iResolution.xy;
+
+    fragColor = vec4(chromatic_aberration(iChannel0, uv),1.0);
 }