/*************************************************************************/
/*  sky.h                                                                */
/*************************************************************************/
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/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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/*************************************************************************/

#ifndef SKY_H
#define SKY_H

#include "core/os/thread.h"
#include "scene/resources/texture.h"

class Sky : public Resource {
	GDCLASS(Sky, Resource);

public:
	enum RadianceSize {
		RADIANCE_SIZE_32,
		RADIANCE_SIZE_64,
		RADIANCE_SIZE_128,
		RADIANCE_SIZE_256,
		RADIANCE_SIZE_512,
		RADIANCE_SIZE_1024,
		RADIANCE_SIZE_2048,
		RADIANCE_SIZE_MAX
	};

private:
	RadianceSize radiance_size;

protected:
	static void _bind_methods();
	virtual void _radiance_changed() = 0;

public:
	void set_radiance_size(RadianceSize p_size);
	RadianceSize get_radiance_size() const;
	Sky();
};

VARIANT_ENUM_CAST(Sky::RadianceSize)

class PanoramaSky : public Sky {
	GDCLASS(PanoramaSky, Sky);

private:
	RID sky;
	Ref<Texture> panorama;

protected:
	static void _bind_methods();
	virtual void _radiance_changed();

public:
	void set_panorama(const Ref<Texture> &p_panorama);
	Ref<Texture> get_panorama() const;

	virtual RID get_rid() const;

	PanoramaSky();
	~PanoramaSky();
};

class ProceduralSky : public Sky {
	GDCLASS(ProceduralSky, Sky);

public:
	enum TextureSize {
		TEXTURE_SIZE_256,
		TEXTURE_SIZE_512,
		TEXTURE_SIZE_1024,
		TEXTURE_SIZE_2048,
		TEXTURE_SIZE_4096,
		TEXTURE_SIZE_MAX
	};

private:
	Thread sky_thread;
	Color sky_top_color;
	Color sky_horizon_color;
	float sky_curve;
	float sky_energy;

	Color ground_bottom_color;
	Color ground_horizon_color;
	float ground_curve;
	float ground_energy;

	Color sun_color;
	float sun_latitude;
	float sun_longitude;
	float sun_angle_min;
	float sun_angle_max;
	float sun_curve;
	float sun_energy;

	TextureSize texture_size;

	RID sky;
	RID texture;
	Ref<Image> panorama;

	bool update_queued;
	bool regen_queued;

	bool first_time;

	void _thread_done(const Ref<Image> &p_image);
	static void _thread_function(void *p_ud);

protected:
	static void _bind_methods();
	virtual void _radiance_changed();

	Ref<Image> _generate_sky();
	void _update_sky();

	void _queue_update();

public:
	void set_sky_top_color(const Color &p_sky_top);
	Color get_sky_top_color() const;

	void set_sky_horizon_color(const Color &p_sky_horizon);
	Color get_sky_horizon_color() const;

	void set_sky_curve(float p_curve);
	float get_sky_curve() const;

	void set_sky_energy(float p_energy);
	float get_sky_energy() const;

	void set_ground_bottom_color(const Color &p_ground_bottom);
	Color get_ground_bottom_color() const;

	void set_ground_horizon_color(const Color &p_ground_horizon);
	Color get_ground_horizon_color() const;

	void set_ground_curve(float p_curve);
	float get_ground_curve() const;

	void set_ground_energy(float p_energy);
	float get_ground_energy() const;

	void set_sun_color(const Color &p_sun);
	Color get_sun_color() const;

	void set_sun_latitude(float p_angle);
	float get_sun_latitude() const;

	void set_sun_longitude(float p_angle);
	float get_sun_longitude() const;

	void set_sun_angle_min(float p_angle);
	float get_sun_angle_min() const;

	void set_sun_angle_max(float p_angle);
	float get_sun_angle_max() const;

	void set_sun_curve(float p_curve);
	float get_sun_curve() const;

	void set_sun_energy(float p_energy);
	float get_sun_energy() const;

	void set_texture_size(TextureSize p_size);
	TextureSize get_texture_size() const;

	Ref<Image> get_panorama() const;

	virtual RID get_rid() const;

	ProceduralSky(bool p_desaturate = false);
	~ProceduralSky();
};

VARIANT_ENUM_CAST(ProceduralSky::TextureSize)

#endif // SKY_H