🚚 Move shader code to GLSL files

resources/shaders/common/math2D.glsl

@@ -0,0 +1,10 @@
+float distToLine(vec2 origin, vec2 direction, vec2 point) {
+  vec2 perpendicular = vec2(direction.y, -direction.x);
+  return abs(dot(normalize(perpendicular), origin - point));
+}
+
+float getWinding(vec2 a, vec2 b) { return cross(vec3(a, 0.0), vec3(b, 0.0)).z; }
+
+vec2 rotate(vec2 a, float angle) {
+  return vec2(a.x * cos(angle) - a.y * sin(angle), a.x * sin(angle) + a.y * cos(angle));
+}