/*************************************************************************/
/*  decal.h                                                              */
/*************************************************************************/
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
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#ifndef DECAL_H
#define DECAL_H

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

class Decal : public VisualInstance3D {
	GDCLASS(Decal, VisualInstance3D);

public:
	enum DecalTexture {
		TEXTURE_ALBEDO,
		TEXTURE_NORMAL,
		TEXTURE_ORM,
		TEXTURE_EMISSION,
		TEXTURE_MAX
	};

private:
	RID decal;
	Vector3 extents = Vector3(1, 1, 1);
	Ref<Texture2D> textures[TEXTURE_MAX];
	float emission_energy = 1.0;
	float albedo_mix = 1.0;
	Color modulate = Color(1, 1, 1, 1);
	uint32_t cull_mask = (1 << 20) - 1;
	float normal_fade = 0.0;
	float upper_fade = 0.3;
	float lower_fade = 0.3;
	bool distance_fade_enabled = false;
	float distance_fade_begin = 10.0;
	float distance_fade_length = 1.0;

protected:
	static void _bind_methods();

public:
	void set_extents(const Vector3 &p_extents);
	Vector3 get_extents() const;

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

	void set_emission_energy(float p_energy);
	float get_emission_energy() const;

	void set_albedo_mix(float p_mix);
	float get_albedo_mix() const;

	void set_modulate(Color p_modulate);
	Color get_modulate() const;

	void set_upper_fade(float p_energy);
	float get_upper_fade() const;

	void set_lower_fade(float p_fade);
	float get_lower_fade() const;

	void set_normal_fade(float p_fade);
	float get_normal_fade() const;

	void set_enable_distance_fade(bool p_enable);
	bool is_distance_fade_enabled() const;

	void set_distance_fade_begin(float p_distance);
	float get_distance_fade_begin() const;

	void set_distance_fade_length(float p_length);
	float get_distance_fade_length() const;

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

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

	Decal();
	~Decal();
};

VARIANT_ENUM_CAST(Decal::DecalTexture);

#endif // DECAL_H