/*************************************************************************/
/*  static_raycaster.h                                                   */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
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#ifndef STATIC_RAYCASTER_H
#define STATIC_RAYCASTER_H

#include "core/object/ref_counted.h"

#if !defined(__aligned)

#if defined(_WIN32) && defined(_MSC_VER)
#define __aligned(...) __declspec(align(__VA_ARGS__))
#else
#define __aligned(...) __attribute__((aligned(__VA_ARGS__)))
#endif

#endif

class StaticRaycaster : public RefCounted {
	GDCLASS(StaticRaycaster, RefCounted)
protected:
	static StaticRaycaster *(*create_function)();

public:
	// compatible with embree3 rays
	struct __aligned(16) Ray {
		const static unsigned int INVALID_GEOMETRY_ID = ((unsigned int)-1); // from rtcore_common.h

		/*! Default construction does nothing. */
		_FORCE_INLINE_ Ray() :
				geomID(INVALID_GEOMETRY_ID) {}

		/*! Constructs a ray from origin, direction, and ray segment. Near
		 *  has to be smaller than far. */
		_FORCE_INLINE_ Ray(const Vector3 &org,
				const Vector3 &dir,
				float tnear = 0.0f,
				float tfar = INFINITY) :
				org(org),
				tnear(tnear),
				dir(dir),
				time(0.0f),
				tfar(tfar),
				mask(-1),
				u(0.0),
				v(0.0),
				primID(INVALID_GEOMETRY_ID),
				geomID(INVALID_GEOMETRY_ID),
				instID(INVALID_GEOMETRY_ID) {}

		/*! Tests if we hit something. */
		_FORCE_INLINE_ explicit operator bool() const { return geomID != INVALID_GEOMETRY_ID; }

	public:
		Vector3 org; //!< Ray origin + tnear
		float tnear; //!< Start of ray segment
		Vector3 dir; //!< Ray direction + tfar
		float time; //!< Time of this ray for motion blur.
		float tfar; //!< End of ray segment
		unsigned int mask; //!< used to mask out objects during traversal
		unsigned int id; //!< ray ID
		unsigned int flags; //!< ray flags

		Vector3 normal; //!< Not normalized geometry normal
		float u; //!< Barycentric u coordinate of hit
		float v; //!< Barycentric v coordinate of hit
		unsigned int primID; //!< primitive ID
		unsigned int geomID; //!< geometry ID
		unsigned int instID; //!< instance ID
	};

	virtual bool intersect(Ray &p_ray) = 0;
	virtual void intersect(Vector<Ray> &r_rays) = 0;

	virtual void add_mesh(const PackedVector3Array &p_vertices, const PackedInt32Array &p_indices, unsigned int p_id) = 0;
	virtual void commit() = 0;

	virtual void set_mesh_filter(const Set<int> &p_mesh_ids) = 0;
	virtual void clear_mesh_filter() = 0;

	static Ref<StaticRaycaster> create();
};

#endif // STATIC_RAYCASTER_H