/*************************************************************************/
/*  light_3d.h                                                           */
/*************************************************************************/
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/*                           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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/*************************************************************************/

#ifndef LIGHT_H
#define LIGHT_H

#include "scene/3d/visual_instance_3d.h"
#include "scene/resources/texture.h"
#include "servers/rendering_server.h"

class Light3D : public VisualInstance3D {
	GDCLASS(Light3D, VisualInstance3D);
	OBJ_CATEGORY("3D Light Nodes");

public:
	enum Param {
		PARAM_ENERGY = RS::LIGHT_PARAM_ENERGY,
		PARAM_INDIRECT_ENERGY = RS::LIGHT_PARAM_INDIRECT_ENERGY,
		PARAM_SPECULAR = RS::LIGHT_PARAM_SPECULAR,
		PARAM_RANGE = RS::LIGHT_PARAM_RANGE,
		PARAM_SIZE = RS::LIGHT_PARAM_SIZE,
		PARAM_ATTENUATION = RS::LIGHT_PARAM_ATTENUATION,
		PARAM_SPOT_ANGLE = RS::LIGHT_PARAM_SPOT_ANGLE,
		PARAM_SPOT_ATTENUATION = RS::LIGHT_PARAM_SPOT_ATTENUATION,
		PARAM_SHADOW_MAX_DISTANCE = RS::LIGHT_PARAM_SHADOW_MAX_DISTANCE,
		PARAM_SHADOW_SPLIT_1_OFFSET = RS::LIGHT_PARAM_SHADOW_SPLIT_1_OFFSET,
		PARAM_SHADOW_SPLIT_2_OFFSET = RS::LIGHT_PARAM_SHADOW_SPLIT_2_OFFSET,
		PARAM_SHADOW_SPLIT_3_OFFSET = RS::LIGHT_PARAM_SHADOW_SPLIT_3_OFFSET,
		PARAM_SHADOW_FADE_START = RS::LIGHT_PARAM_SHADOW_FADE_START,
		PARAM_SHADOW_NORMAL_BIAS = RS::LIGHT_PARAM_SHADOW_NORMAL_BIAS,
		PARAM_SHADOW_BIAS = RS::LIGHT_PARAM_SHADOW_BIAS,
		PARAM_SHADOW_PANCAKE_SIZE = RS::LIGHT_PARAM_SHADOW_PANCAKE_SIZE,
		PARAM_SHADOW_BLUR = RS::LIGHT_PARAM_SHADOW_BLUR,
		PARAM_TRANSMITTANCE_BIAS = RS::LIGHT_PARAM_TRANSMITTANCE_BIAS,
		PARAM_MAX = RS::LIGHT_PARAM_MAX
	};

	enum BakeMode {
		BAKE_DISABLED,
		BAKE_DYNAMIC,
		BAKE_STATIC
	};

private:
	Color color;
	float param[PARAM_MAX];
	Color shadow_color;
	bool shadow;
	bool negative;
	bool reverse_cull;
	uint32_t cull_mask;
	RS::LightType type;
	bool editor_only;
	void _update_visibility();
	BakeMode bake_mode;
	Ref<Texture2D> projector;

	// bind helpers

protected:
	RID light;

	virtual bool _can_gizmo_scale() const;

	static void _bind_methods();
	void _notification(int p_what);
	virtual void _validate_property(PropertyInfo &property) const;

	Light3D(RenderingServer::LightType p_type);

public:
	RS::LightType get_light_type() const { return type; }

	void set_editor_only(bool p_editor_only);
	bool is_editor_only() const;

	void set_param(Param p_param, float p_value);
	float get_param(Param p_param) const;

	void set_shadow(bool p_enable);
	bool has_shadow() const;

	void set_negative(bool p_enable);
	bool is_negative() const;

	void set_cull_mask(uint32_t p_cull_mask);
	uint32_t get_cull_mask() const;

	void set_color(const Color &p_color);
	Color get_color() const;

	void set_shadow_color(const Color &p_shadow_color);
	Color get_shadow_color() const;

	void set_shadow_reverse_cull_face(bool p_enable);
	bool get_shadow_reverse_cull_face() const;

	void set_bake_mode(BakeMode p_mode);
	BakeMode get_bake_mode() const;

	void set_projector(const Ref<Texture2D> &p_texture);
	Ref<Texture2D> get_projector() const;

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

	Light3D();
	~Light3D();
};

VARIANT_ENUM_CAST(Light3D::Param);
VARIANT_ENUM_CAST(Light3D::BakeMode);

class DirectionalLight3D : public Light3D {
	GDCLASS(DirectionalLight3D, Light3D);

public:
	enum ShadowMode {
		SHADOW_ORTHOGONAL,
		SHADOW_PARALLEL_2_SPLITS,
		SHADOW_PARALLEL_4_SPLITS
	};

	enum ShadowDepthRange {
		SHADOW_DEPTH_RANGE_STABLE = RS::LIGHT_DIRECTIONAL_SHADOW_DEPTH_RANGE_STABLE,
		SHADOW_DEPTH_RANGE_OPTIMIZED = RS::LIGHT_DIRECTIONAL_SHADOW_DEPTH_RANGE_OPTIMIZED,
	};

private:
	bool blend_splits;
	ShadowMode shadow_mode;
	ShadowDepthRange shadow_depth_range;

protected:
	static void _bind_methods();

public:
	void set_shadow_mode(ShadowMode p_mode);
	ShadowMode get_shadow_mode() const;

	void set_shadow_depth_range(ShadowDepthRange p_range);
	ShadowDepthRange get_shadow_depth_range() const;

	void set_blend_splits(bool p_enable);
	bool is_blend_splits_enabled() const;

	DirectionalLight3D();
};

VARIANT_ENUM_CAST(DirectionalLight3D::ShadowMode)
VARIANT_ENUM_CAST(DirectionalLight3D::ShadowDepthRange)

class OmniLight3D : public Light3D {
	GDCLASS(OmniLight3D, Light3D);

public:
	// omni light
	enum ShadowMode {
		SHADOW_DUAL_PARABOLOID,
		SHADOW_CUBE,
	};

private:
	ShadowMode shadow_mode;

protected:
	static void _bind_methods();

public:
	void set_shadow_mode(ShadowMode p_mode);
	ShadowMode get_shadow_mode() const;

	virtual String get_configuration_warning() const;

	OmniLight3D();
};

VARIANT_ENUM_CAST(OmniLight3D::ShadowMode)

class SpotLight3D : public Light3D {
	GDCLASS(SpotLight3D, Light3D);

protected:
	static void _bind_methods();

public:
	virtual String get_configuration_warning() const;

	SpotLight3D() :
			Light3D(RenderingServer::LIGHT_SPOT) {}
};

#endif