slowly descending into madness

shaders/point_update_shader.gdshader

@@ -0,0 +1,38 @@
+shader_type canvas_item;
+
+uniform sampler2D point_texture;
+uniform sampler2D trail_texture;
+
+uniform ivec2 point_texture_size;
+uniform ivec2 canvas_size;
+uniform float point_speed;
+
+varying vec4 data;
+
+// Snippets of code drawn from https://gist.github.com/Bleuje/1e497df4505ca24c39ab3930a95700b3
+float gn(in vec2 coordinate, in float seed){
+    return fract(tan(distance(coordinate*(seed+0.118446744073709551614), vec2(0.118446744073709551614, 0.314159265358979323846264)))*0.141421356237309504880169);
+}
+
+float trail_at_pos(vec2 uv) {
+	return texture(trail_texture, uv).r;
+}
+
+void vertex() {
+	int id = INSTANCE_ID;
+	int x = id % point_texture_size.x;
+	int y = id / point_texture_size.x;
+	// This feels dumb
+	vec2 uv = vec2(float(x), float(y));
+	vec4 point_data = texture(point_texture, uv);
+	
+	vec2 pos = point_data.xy;
+	float angle = point_data.z;
+
+	//COLOR = vec4(0.2, 0.0, 0.0, 1.0)
+	data=vec4(pos, angle, point_data.z);
+}
+
+void fragment() {
+	COLOR=data;
+}