Gource is cool

gource/data/shaders/bloom.frag

@@ -0,0 +1,16 @@
+
+varying vec3 pos;
+
+void main()
+{
+    float r = fract(sin(dot(pos.xy ,vec2(11.3713,67.3219))) * 2351.3718);
+
+    float offset = (0.5 - r) * gl_TexCoord[0].x * 0.045;
+
+    float intensity = min(1.0, cos((length(pos*2.0)+offset)/gl_TexCoord[0].x));
+    float gradient  = intensity * smoothstep(0.0, 2.0, intensity);
+
+    gradient *= smoothstep(1.0,0.67+r*0.33, 1.0-intensity);
+
+    gl_FragColor = gl_Color * gradient;
+}