use inactive/active color gizmo

thermion_dart/native/include/Gizmo.hpp

@@ -7,6 +7,7 @@
 #include <filament/Scene.h>
 #include <filament/Camera.h>
 #include <filament/View.h>
+#include <filament/Viewport.h>
 
 #include <gltfio/AssetLoader.h>
 #include <gltfio/FilamentAsset.h>
@@ -20,15 +21,19 @@
 
 #include "Aabb2.h"
 
+namespace thermion_filament {
+
 using namespace filament;
 using namespace utils;
 
-
 class Gizmo { 
+
+    enum Axis { X, Y, Z};
+
     public:
-        Gizmo(Engine* const engine);
-        void updateTransform();
-        void destroy(Engine* const engine);
+        Gizmo(Engine& engine);
+        void updateTransform(Camera& camera, const Viewport& vp);
+        void destroy();
         Entity x() {
             return _entities[0];
         };
@@ -41,8 +46,24 @@ class Gizmo {
         Entity center() {
             return _entities[3];
         };
+
+        void highlight(Entity entity);
+        void unhighlight();
     private:
+        Engine &_engine;
         utils::Entity _entities[4];
         Material* _material;
         MaterialInstance* _materialInstances[4];
-};
+        math::float3 inactiveColors[3] {
+            math::float3 { 0.75f, 0.0f, 0.0f },
+            math::float3 { 0.0f, 0.75f, 0.0f },
+            math::float3 { 0.0f, 0.0f, 0.75f },
+        };
+        math::float3 activeColors[3] {
+            math::float3 { 1.0f, 0.0f, 0.0f },
+            math::float3 { 0.0f, 1.0f, 0.0f },
+            math::float3 { 0.0f, 0.0f, 1.0f },
+        };
+};
+
+}