Reorganize code

game/utils.go

@@ -0,0 +1,45 @@
+package game
+
+import (
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+func RayIntersectsBox(ray rl.Ray, boxMin, boxMax rl.Vector3) bool {
+	tmin := (boxMin.X - ray.Position.X) / ray.Direction.X
+	tmax := (boxMax.X - ray.Position.X) / ray.Direction.X
+
+	if tmin > tmax {
+		tmin, tmax = tmax, tmin
+	}
+
+	tymin := (boxMin.Z - ray.Position.Z) / ray.Direction.Z
+	tymax := (boxMax.Z - ray.Position.Z) / ray.Direction.Z
+
+	if tymin > tymax {
+		tymin, tymax = tymax, tymin
+	}
+
+	if (tmin > tymax) || (tymin > tmax) {
+		return false
+	}
+
+	if tymin > tmin {
+		tmin = tymin
+	}
+	if tymax < tmax {
+		tmax = tymax
+	}
+
+	tzmin := (boxMin.Y - ray.Position.Y) / ray.Direction.Y
+	tzmax := (boxMax.Y - ray.Position.Y) / ray.Direction.Y
+
+	if tzmin > tzmax {
+		tzmin, tzmax = tzmax, tzmin
+	}
+
+	if (tmin > tzmax) || (tzmin > tmax) {
+		return false
+	}
+
+	return true
+}