Open source Star Ruler 2 source code!

data/shaders/source/movebeam_ps.txt

@@ -0,0 +1,7 @@
+varying vec2 uv;
+
+void main() {
+	vec4 col = gl_Color;
+	col.a = (1.0 - abs(0.5 - uv.y)) * 2.0;
+	gl_FragColor = col;
+}