lol everyone re-invents a vector lib

math.c

@@ -72,3 +72,30 @@ fn void u32ReverseArray(u32 arr[], u32 size) {
   }
 }
 
+fn Vec2f32 vec2Add(Vec2 a, Vec2 b) {
+  Vec2f32 result = a;
+  result.x += b.x;
+  result.y += b.y;
+  return result;
+}
+
+fn Vec2f32 vec2Subtract(Vec2 a, Vec2 b) {
+  Vec2f32 result = a;
+  result.x -= b.x;
+  result.y -= b.y;
+  return result;
+}
+
+fn Vec2f32 vec2FromHexCube(Vec2 map_center, XYZ cube, f32 size, f32 border_thickness) {
+  f32 hex_height = SQRT_3 * size;
+  f32 hex_width = 2.0 * size; 
+  f32 horiz_spacing = 0.75 * (hex_width - border_thickness);
+  f32 vert_spacing = (hex_height - border_thickness);
+  bool parity = cube.x & 1;
+  i32 use_y = cube.y * -1;
+  return (Vec2) {
+    .x = map_center.x + (cube.x * horiz_spacing),
+    .y = map_center.y + ((use_y + (f32)(cube.x + parity) / 2.0) * vert_spacing) - (parity ? 0.5*vert_spacing : 0),
+  };
+}
+