Post Game jam commit

shaders/dotted_circle.gdshader

@@ -0,0 +1,28 @@
+shader_type canvas_item;
+uniform vec4 color : source_color = vec4(1.0);
+uniform float diameter = 1.0;
+uniform float thickness = 0.05;
+uniform float frequency = 10.0;
+uniform float phase = 0.0;
+
+void fragment() {
+  vec2 pos = UV - vec2(0.5);
+  float outer_radius = diameter / 2.0;
+  float inner_radius = outer_radius - thickness;
+  float outer_circle = step(length(pos), outer_radius);
+  float inner_circle = step(length(pos), inner_radius);
+  
+
+  float angle = atan(pos.y, pos.x);
+  if (angle < 0.0) {
+    angle += 2.0 * PI;
+  }
+
+  float wave = 0.5 * sin(frequency * angle + phase) + 0.5;
+  
+
+  float ring = outer_circle - inner_circle;
+  ring *= step(0.5, wave);
+  
+  COLOR = vec4(color.rgb, ring * color.a);
+}