shadow start

HydraEngine/source/engine/HydraEngine.h

@@ -25,6 +25,7 @@ class HydraTextureBufferManager;
 class HydraMaterialBufferManager;
 class HydraLightBufferManager;
 class HydraLightSystem;
+class HydraShadowSourceSystem;
 
 class CLASS_DEFINE HydraEngine : public HydraObject
 {
@@ -91,6 +92,7 @@ private:
     std::shared_ptr<HydraRenderSystem> m_render_system;
     std::shared_ptr<HydraMaterialSystem> m_material_system;
     std::shared_ptr<HydraLightSystem> m_light_system;
+    std::shared_ptr<HydraShadowSourceSystem> m_shadow_system;
 
     bool m_running = true;
     float m_delta_t = 0.0f;