Adds recursion exit for mirror shader

shader/mirrorshader.cpp

@@ -4,9 +4,15 @@
 MirrorShader::MirrorShader() {}
 
 Color MirrorShader::shade(Scene const &scene, Ray const &ray) const {
+    if (ray.getRemainingBounces() <= 0) {
+        return Color(0, 0, 0);
+    }
+
     Vector3d newDirection = ray.direction - 2 * dotProduct(ray.normal, ray.direction) * ray.normal;
 
     //TODO: should we reset the ray or use a new ray? Regarding the count of bounces
     Ray mirroredRay = Ray(ray.origin + ray.length * ray.direction, newDirection);
+    mirroredRay.setRemainingBounces(ray.getRemainingBounces() - 1);
+
     return scene.traceRay(mirroredRay);
 }