/*************************************************************************/
/*  visual_instance.h                                                    */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
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/* without limitation the rights to use, copy, modify, merge, publish,   */
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/*************************************************************************/

#ifndef VISUAL_INSTANCE_H
#define VISUAL_INSTANCE_H

#include "core/math/face3.h"
#include "core/rid.h"
#include "scene/3d/spatial.h"
#include "scene/resources/material.h"

class VisualInstance : public Spatial {

	GDCLASS(VisualInstance, Spatial);
	OBJ_CATEGORY("3D Visual Nodes");

	RID base;
	RID instance;
	uint32_t layers;

	RID _get_visual_instance_rid() const;

protected:
	void _update_visibility();

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

public:
	enum GetFacesFlags {
		FACES_SOLID = 1, // solid geometry
		FACES_ENCLOSING = 2,
		FACES_DYNAMIC = 4 // dynamic object geometry

	};

	RID get_instance() const;
	virtual AABB get_aabb() const = 0;
	virtual PoolVector<Face3> get_faces(uint32_t p_usage_flags) const = 0;

	virtual AABB get_transformed_aabb() const; // helper

	void set_base(const RID &p_base);
	RID get_base() const;

	void set_layer_mask(uint32_t p_mask);
	uint32_t get_layer_mask() const;

	void set_layer_mask_bit(int p_layer, bool p_enable);
	bool get_layer_mask_bit(int p_layer) const;

	VisualInstance();
	~VisualInstance();
};

class GeometryInstance : public VisualInstance {

	GDCLASS(GeometryInstance, VisualInstance);

public:
	enum Flags {
		FLAG_USE_BAKED_LIGHT = VS::INSTANCE_FLAG_USE_BAKED_LIGHT,
		FLAG_USE_DYNAMIC_GI = VS::INSTANCE_FLAG_USE_DYNAMIC_GI,
		FLAG_DRAW_NEXT_FRAME_IF_VISIBLE = VS::INSTANCE_FLAG_DRAW_NEXT_FRAME_IF_VISIBLE,
		FLAG_MAX = VS::INSTANCE_FLAG_MAX,
	};

	enum ShadowCastingSetting {
		SHADOW_CASTING_SETTING_OFF = VS::SHADOW_CASTING_SETTING_OFF,
		SHADOW_CASTING_SETTING_ON = VS::SHADOW_CASTING_SETTING_ON,
		SHADOW_CASTING_SETTING_DOUBLE_SIDED = VS::SHADOW_CASTING_SETTING_DOUBLE_SIDED,
		SHADOW_CASTING_SETTING_SHADOWS_ONLY = VS::SHADOW_CASTING_SETTING_SHADOWS_ONLY
	};

private:
	bool flags[FLAG_MAX];
	ShadowCastingSetting shadow_casting_setting;
	Ref<Material> material_override;
	float lod_min_distance;
	float lod_max_distance;
	float lod_min_hysteresis;
	float lod_max_hysteresis;

	float extra_cull_margin;

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

public:
	void set_flag(Flags p_flag, bool p_value);
	bool get_flag(Flags p_flag) const;

	void set_cast_shadows_setting(ShadowCastingSetting p_shadow_casting_setting);
	ShadowCastingSetting get_cast_shadows_setting() const;

	void set_lod_min_distance(float p_dist);
	float get_lod_min_distance() const;

	void set_lod_max_distance(float p_dist);
	float get_lod_max_distance() const;

	void set_lod_min_hysteresis(float p_dist);
	float get_lod_min_hysteresis() const;

	void set_lod_max_hysteresis(float p_dist);
	float get_lod_max_hysteresis() const;

	void set_material_override(const Ref<Material> &p_material);
	Ref<Material> get_material_override() const;

	void set_extra_cull_margin(float p_margin);
	float get_extra_cull_margin() const;

	void set_custom_aabb(AABB aabb);

	GeometryInstance();
};

VARIANT_ENUM_CAST(GeometryInstance::Flags);
VARIANT_ENUM_CAST(GeometryInstance::ShadowCastingSetting);

#endif