/*************************************************************************/
/*  occluder_instance_3d.h                                               */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
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/*************************************************************************/

#ifndef OCCLUDER_INSTANCE_3D_H
#define OCCLUDER_INSTANCE_3D_H

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

class Occluder3D : public Resource {
	GDCLASS(Occluder3D, Resource);
	RES_BASE_EXTENSION("occ");

	RID occluder;
	PackedVector3Array vertices;
	PackedInt32Array indices;
	AABB aabb;

	mutable Ref<ArrayMesh> debug_mesh;
	mutable Vector<Vector3> debug_lines;

protected:
	void _update();
	virtual void _update_arrays(PackedVector3Array &r_vertices, PackedInt32Array &r_indices) = 0;

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

public:
	PackedVector3Array get_vertices() const;
	PackedInt32Array get_indices() const;

	Vector<Vector3> get_debug_lines() const;
	Ref<ArrayMesh> get_debug_mesh() const;
	AABB get_aabb() const;

	virtual RID get_rid() const override;
	Occluder3D();
	virtual ~Occluder3D();
};

class ArrayOccluder3D : public Occluder3D {
	GDCLASS(ArrayOccluder3D, Occluder3D);

	PackedVector3Array vertices;
	PackedInt32Array indices;

protected:
	virtual void _update_arrays(PackedVector3Array &r_vertices, PackedInt32Array &r_indices) override;
	static void _bind_methods();

public:
	void set_arrays(PackedVector3Array p_vertices, PackedInt32Array p_indices);
	void set_vertices(PackedVector3Array p_vertices);
	void set_indices(PackedInt32Array p_indices);

	ArrayOccluder3D();
	~ArrayOccluder3D();
};

class QuadOccluder3D : public Occluder3D {
	GDCLASS(QuadOccluder3D, Occluder3D);

private:
	Vector2 size = Vector2(1.0f, 1.0f);

protected:
	virtual void _update_arrays(PackedVector3Array &r_vertices, PackedInt32Array &r_indices) override;
	static void _bind_methods();

public:
	Vector2 get_size() const;
	void set_size(const Vector2 &p_size);

	QuadOccluder3D();
	~QuadOccluder3D();
};

class BoxOccluder3D : public Occluder3D {
	GDCLASS(BoxOccluder3D, Occluder3D);

private:
	Vector3 size = Vector3(1.0f, 1.0f, 1.0f);

protected:
	virtual void _update_arrays(PackedVector3Array &r_vertices, PackedInt32Array &r_indices) override;
	static void _bind_methods();

public:
	Vector3 get_size() const;
	void set_size(const Vector3 &p_size);

	BoxOccluder3D();
	~BoxOccluder3D();
};

class SphereOccluder3D : public Occluder3D {
	GDCLASS(SphereOccluder3D, Occluder3D);

private:
	static constexpr int RINGS = 7;
	static constexpr int RADIAL_SEGMENTS = 7;
	float radius = 1.0f;

protected:
	virtual void _update_arrays(PackedVector3Array &r_vertices, PackedInt32Array &r_indices) override;
	static void _bind_methods();

public:
	float get_radius() const;
	void set_radius(float p_radius);

	SphereOccluder3D();
	~SphereOccluder3D();
};

class PolygonOccluder3D : public Occluder3D {
	GDCLASS(PolygonOccluder3D, Occluder3D);

private:
	Vector<Vector2> polygon;

	bool _has_editable_3d_polygon_no_depth() const;

protected:
	virtual void _update_arrays(PackedVector3Array &r_vertices, PackedInt32Array &r_indices) override;
	static void _bind_methods();

public:
	void set_polygon(const Vector<Vector2> &p_polygon);
	Vector<Vector2> get_polygon() const;

	PolygonOccluder3D();
	~PolygonOccluder3D();
};

class OccluderInstance3D : public VisualInstance3D {
	GDCLASS(OccluderInstance3D, Node3D);

private:
	Ref<Occluder3D> occluder;
	uint32_t bake_mask = 0xFFFFFFFF;
	float bake_simplification_dist = 0.1f;

	void _occluder_changed();

	static bool _bake_material_check(Ref<Material> p_material);
	static void _bake_surface(const Transform3D &p_transform, Array p_surface_arrays, Ref<Material> p_material, float p_simplification_dist, PackedVector3Array &r_vertices, PackedInt32Array &r_indices);
	void _bake_node(Node *p_node, PackedVector3Array &r_vertices, PackedInt32Array &r_indices);

	bool _is_editable_3d_polygon() const;
	Ref<Resource> _get_editable_3d_polygon_resource() const;

protected:
	static void _bind_methods();

public:
	virtual TypedArray<String> get_configuration_warnings() const override;

	enum BakeError {
		BAKE_ERROR_OK,
		BAKE_ERROR_NO_SAVE_PATH,
		BAKE_ERROR_NO_MESHES,
		BAKE_ERROR_CANT_SAVE,
	};

	void set_occluder(const Ref<Occluder3D> &p_occluder);
	Ref<Occluder3D> get_occluder() const;

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

	void set_bake_mask(uint32_t p_mask);
	uint32_t get_bake_mask() const;

	void set_bake_simplification_distance(float p_dist);
	float get_bake_simplification_distance() const;

	void set_bake_mask_value(int p_layer_number, bool p_enable);
	bool get_bake_mask_value(int p_layer_number) const;

	BakeError bake_scene(Node *p_from_node, String p_occluder_path = "");
	static void bake_single_node(const Node3D *p_node, float p_simplification_distance, PackedVector3Array &r_vertices, PackedInt32Array &r_indices);

	OccluderInstance3D();
	~OccluderInstance3D();
};

#endif