/*************************************************************************/
/*  gpu_particles_2d.h                                                   */
/*************************************************************************/
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
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#ifndef PARTICLES_2D_H
#define PARTICLES_2D_H

#include "core/rid.h"
#include "scene/2d/node_2d.h"
#include "scene/resources/texture.h"

class GPUParticles2D : public Node2D {
private:
	GDCLASS(GPUParticles2D, Node2D);

public:
	enum DrawOrder {
		DRAW_ORDER_INDEX,
		DRAW_ORDER_LIFETIME,
	};

private:
	RID particles;

	bool one_shot;
	int amount;
	float lifetime;
	float pre_process_time;
	float explosiveness_ratio;
	float randomness_ratio;
	float speed_scale;
	Rect2 visibility_rect;
	bool local_coords;
	int fixed_fps;
	bool fractional_delta;

	Ref<Material> process_material;

	DrawOrder draw_order;

	Ref<Texture2D> texture;

	void _update_particle_emission_transform();

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

public:
	void set_emitting(bool p_emitting);
	void set_amount(int p_amount);
	void set_lifetime(float p_lifetime);
	void set_one_shot(bool p_enable);
	void set_pre_process_time(float p_time);
	void set_explosiveness_ratio(float p_ratio);
	void set_randomness_ratio(float p_ratio);
	void set_visibility_rect(const Rect2 &p_visibility_rect);
	void set_use_local_coordinates(bool p_enable);
	void set_process_material(const Ref<Material> &p_material);
	void set_speed_scale(float p_scale);

	bool is_emitting() const;
	int get_amount() const;
	float get_lifetime() const;
	bool get_one_shot() const;
	float get_pre_process_time() const;
	float get_explosiveness_ratio() const;
	float get_randomness_ratio() const;
	Rect2 get_visibility_rect() const;
	bool get_use_local_coordinates() const;
	Ref<Material> get_process_material() const;
	float get_speed_scale() const;

	void set_fixed_fps(int p_count);
	int get_fixed_fps() const;

	void set_fractional_delta(bool p_enable);
	bool get_fractional_delta() const;

	void set_draw_order(DrawOrder p_order);
	DrawOrder get_draw_order() const;

	void set_texture(const Ref<Texture2D> &p_texture);
	Ref<Texture2D> get_texture() const;

	virtual String get_configuration_warning() const override;

	void restart();
	Rect2 capture_rect() const;
	GPUParticles2D();
	~GPUParticles2D();
};

VARIANT_ENUM_CAST(GPUParticles2D::DrawOrder)

#endif // PARTICLES_2D_H