feat: add camera culling masks

tests/Components/test_camera_light_component.cpp

@@ -19,6 +19,7 @@ TEST(CameraComponent_Test, DefaultValues) {
     EXPECT_FLOAT_EQ(camera.GetFarClipPlane(), 1000.0f);
     EXPECT_TRUE(camera.IsPrimary());
     EXPECT_EQ(camera.GetClearMode(), CameraClearMode::Auto);
+    EXPECT_EQ(camera.GetCullingMask(), 0xFFFFFFFFu);
 }
 
 TEST(CameraComponent_Test, SetterClamping) {
@@ -38,6 +39,7 @@ TEST(CameraComponent_Test, SetterClamping) {
 TEST(CameraComponent_Test, SerializeRoundTripPreservesClearMode) {
     CameraComponent source;
     source.SetClearMode(CameraClearMode::DepthOnly);
+    source.SetCullingMask(0x0000000Fu);
 
     std::stringstream stream;
     source.Serialize(stream);
@@ -46,6 +48,7 @@ TEST(CameraComponent_Test, SerializeRoundTripPreservesClearMode) {
     target.Deserialize(stream);
 
     EXPECT_EQ(target.GetClearMode(), CameraClearMode::DepthOnly);
+    EXPECT_EQ(target.GetCullingMask(), 0x0000000Fu);
 }
 
 TEST(LightComponent_Test, DefaultValues) {

tests/Components/test_game_object.cpp

@@ -4,6 +4,8 @@
 #include <XCEngine/Scene/Scene.h>
 #include <XCEngine/Core/Math/Vector3.h>
 
+#include <sstream>
+
 using namespace XCEngine::Components;
 using namespace XCEngine::Math;
 
@@ -64,6 +66,20 @@ TEST(GameObject_Test, NamedConstructor) {
     EXPECT_EQ(go.GetName(), "TestObject");
 }
 
+TEST(GameObject_Test, Layer_GetSetAndSerializeRoundTrip) {
+    GameObject source("LayeredObject");
+    source.SetLayer(7);
+
+    std::stringstream stream;
+    source.Serialize(stream);
+
+    GameObject target;
+    target.Deserialize(stream);
+
+    EXPECT_EQ(source.GetLayer(), 7u);
+    EXPECT_EQ(target.GetLayer(), 7u);
+}
+
 TEST(GameObject_Test, AddComponent_Single) {
     GameObject go;