xr_collide_defs.h

#pragma once

#include "xrcdb.h"

class CObject;
namespace collide 
{
	struct			tri {
		Fvector	e10; float e10s;
		Fvector	e21; float e21s;
		Fvector	e02; float e02s;
		Fvector p[3];
		Fvector N;
		float	d;
	};
	struct			elipsoid {
		Fmatrix	mL2W;		// convertion from sphere(000,1) to real space
		Fmatrix	mW2L;		// convertion from real space to sphere(000,1)
	};
	struct			ray_cache
	{
		// previous state
		Fvector				start;
		Fvector				dir;
		float				range;
		BOOL				result;

		// cached vertices
		Fvector				verts[3];
		ray_cache() 
		{
			start.set	(0,0,0);
			dir.set		(0,0,0);
			range		= 0;
			result		= FALSE;
			verts[0].set(0,0,0);
			verts[1].set(0,0,0);
			verts[2].set(0,0,0);
		}
		void				set		(const Fvector& _start, const Fvector& _dir, const float _range,const BOOL _result)
		{
			start	= _start;
			dir		= _dir;
			range	= _range;
			result	= _result;
		}
		BOOL				similar	(const Fvector& _start, const Fvector& _dir, const float _range)
		{
			if (!_start.similar(start))					return FALSE;
			if (!fsimilar(1.f,dir.dotproduct(_dir)))	return FALSE;
			if (!fsimilar(_range,range))				return FALSE;
			return			TRUE;
		}
	};
	enum rq_target	{
		rqtNone		= (0),
		rqtObject	= (1<<0),
		rqtStatic	= (1<<1),
		rqtShape	= (1<<2),
		rqtObstacle	= (1<<3),
		rqtBoth		= (rqtObject|rqtStatic),
		rqtDyn		= (rqtObject|rqtShape|rqtObstacle)
	};
	struct			ray_defs
	{
		Fvector		start;
		Fvector		dir;
		float		range;
		u32			flags;
		rq_target	tgt;
		ray_defs	(const Fvector& _start, const Fvector& _dir, float _range, u32 _flags, rq_target _tgt)
		{
			start	= _start;
			dir		= _dir;
			range	= _range;
			flags	= _flags;
			tgt		= _tgt;
		}
	};
	struct			rq_result 
	{
		CObject*	O;				// if NULL - static
		float		range;			// range to intersection
		int			element;		// номер кости/номер треугольника
		IC rq_result& set		(CObject* _O, float _range, int _element)
		{
			O		= _O;
			range	= _range;
			element	= _element;
			return	*this;
		}
		IC BOOL		set_if_less	(CDB::RESULT*	I){if (I->range<range){ set(0,I->range,I->id);			return TRUE;}else return FALSE;}
		IC BOOL		set_if_less	(rq_result*		R){if (R->range<range){ set(R->O,R->range,R->element);	return TRUE;}else return FALSE;}
		IC BOOL		set_if_less	(CObject* _who, float _range, int _element)	{ if (_range<range) { set(_who,_range,_element); return TRUE;}else return FALSE;}
		IC BOOL		valid		() {return (element>=0);}
	};
	DEFINE_VECTOR	(rq_result,rqVec,rqIt);
	
	class			rq_results
	{
	protected:
		rqVec		results;
		static bool	r_sort_pred		(const rq_result& a, const rq_result& b)	{	return a.range<b.range;}
	public:
		IC BOOL		append_result	(CObject* _who, float _range, int _element, BOOL bNearest)
		{
			if (bNearest&&!results.empty()){
				rq_result& R		= results.back();
				if (_range<R.range){
					R.O				=_who;
					R.range			=_range;
					R.element		=_element;
					return			TRUE;
				}
				return				FALSE;
			}

			auto& rq = results.emplace_back();
			rq.range	=_range;
			rq.element	=_element;
			rq.O		=_who;
			return TRUE	;
		}
		IC void		append_result	(rq_result& res)
		{
			if (0==results.capacity())	results.reserve(8);
			results.push_back			(res);
		}
		IC int			r_count			()	{ return results.size();	}
		IC rq_result* r_begin() { return std::data(results); }
		IC rq_result* r_end()   { return std::data(results) + std::size(results); }
		IC void			r_clear			()	{ results.clear_not_free();	}
		IC void			r_sort			()	{ std::sort(results.begin(),results.end(),r_sort_pred);}
		IC rqVec		&r_results		()	{ return results; }

	};
	typedef  BOOL		rq_callback 	(rq_result& result, LPVOID user_data);
	typedef  BOOL		test_callback 	(const ray_defs& rd, CObject* object, LPVOID user_data);
};