/*************************************************************************/
/*  visible_on_screen_notifier_3d.h                                      */
/*************************************************************************/
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
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#ifndef VISIBLE_ON_SCREEN_NOTIFIER_3D_H
#define VISIBLE_ON_SCREEN_NOTIFIER_3D_H

#include "scene/3d/visual_instance_3d.h"

class World3D;
class Camera3D;
class VisibleOnScreenNotifier3D : public VisualInstance3D {
	GDCLASS(VisibleOnScreenNotifier3D, VisualInstance3D);

	AABB aabb = AABB(Vector3(-1, -1, -1), Vector3(2, 2, 2));

private:
	bool on_screen = false;
	void _visibility_enter();
	void _visibility_exit();

protected:
	virtual void _screen_enter() {}
	virtual void _screen_exit() {}

	void _notification(int p_what);
	static void _bind_methods();

public:
	void set_aabb(const AABB &p_aabb);
	virtual AABB get_aabb() const override;
	bool is_on_screen() const;

	virtual Vector<Face3> get_faces(uint32_t p_usage_flags) const override;

	VisibleOnScreenNotifier3D();
	~VisibleOnScreenNotifier3D();
};

class VisibleOnScreenEnabler3D : public VisibleOnScreenNotifier3D {
	GDCLASS(VisibleOnScreenEnabler3D, VisibleOnScreenNotifier3D);

public:
	enum EnableMode {
		ENABLE_MODE_INHERIT,
		ENABLE_MODE_ALWAYS,
		ENABLE_MODE_WHEN_PAUSED,
	};

protected:
	ObjectID node_id;
	virtual void _screen_enter() override;
	virtual void _screen_exit() override;

	EnableMode enable_mode = ENABLE_MODE_INHERIT;
	NodePath enable_node_path = NodePath("..");

	void _notification(int p_what);
	static void _bind_methods();

	void _update_enable_mode(bool p_enable);

public:
	void set_enable_mode(EnableMode p_mode);
	EnableMode get_enable_mode();

	void set_enable_node_path(NodePath p_path);
	NodePath get_enable_node_path();

	VisibleOnScreenEnabler3D();
};

VARIANT_ENUM_CAST(VisibleOnScreenEnabler3D::EnableMode);

#endif // VISIBILITY_NOTIFIER_H