/*************************************************************************/
/*  surface_tool.h                                                       */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
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/*************************************************************************/
#ifndef SURFACE_TOOL_H
#define SURFACE_TOOL_H

#include "scene/resources/mesh.h"
#include "mikktspace.h"


class SurfaceTool : public Reference {

	GDCLASS(SurfaceTool, Reference );
public:
	struct Vertex {

			Vector3 vertex;
			Color color;
			Vector3 normal; // normal, binormal, tangent
			Vector3 binormal;
			Vector3 tangent;
			Vector2 uv;
			Vector2 uv2;
			Vector<int> bones;
			Vector<float> weights;

			bool operator==(const Vertex& p_vertex) const;

			Vertex() {  }
	};


private:

	struct VertexHasher {
		static _FORCE_INLINE_ uint32_t hash(const Vertex &p_vtx);
	};

	bool begun;
	bool first;
	Mesh::PrimitiveType primitive;
	int format;
	Ref<Material> material;
	//arrays
	List< Vertex > vertex_array;
	List< int > index_array;
	Map<int,bool> smooth_groups;

	//memory
	Color last_color;
	Vector3 last_normal;
	Vector2 last_uv;
	Vector2 last_uv2;
	Vector<int> last_bones;
	Vector<float> last_weights;
	Plane last_tangent;

	void _create_list(const Ref<Mesh>& p_existing, int p_surface, List<Vertex> *r_vertex, List<int> *r_index,int &lformat);


	//mikktspace callbacks
	static int mikktGetNumFaces(const SMikkTSpaceContext * pContext);
	static int mikktGetNumVerticesOfFace(const SMikkTSpaceContext * pContext, const int iFace);
	static void mikktGetPosition(const SMikkTSpaceContext * pContext, float fvPosOut[], const int iFace, const int iVert);
	static void mikktGetNormal(const SMikkTSpaceContext * pContext, float fvNormOut[], const int iFace, const int iVert);
	static void mikktGetTexCoord(const SMikkTSpaceContext * pContext, float fvTexcOut[], const int iFace, const int iVert);
	static void mikktSetTSpaceBasic(const SMikkTSpaceContext * pContext, const float fvTangent[], const float fSign, const int iFace, const int iVert);
protected:

	static void _bind_methods();

public:

	void begin(Mesh::PrimitiveType p_primitive);

	void add_vertex( const Vector3& p_vertex);
	void add_color( Color p_color );
	void add_normal( const Vector3& p_normal);
	void add_tangent( const Plane& p_tangent );
	void add_uv( const Vector2& p_uv);
	void add_uv2( const Vector2& p_uv);
	void add_bones( const Vector<int>& p_indices);
	void add_weights( const Vector<float>& p_weights);
	void add_smooth_group(bool p_smooth);

	void add_triangle_fan( const Vector<Vector3>& p_vertexes, const Vector<Vector2>& p_uvs=Vector<Vector2>(), const Vector<Color>& p_colors=Vector<Color>(), const Vector<Vector2>& p_uv2s=Vector<Vector2>(), const Vector<Vector3>& p_normals=Vector<Vector3>(), const Vector<Plane>& p_tangents=Vector<Plane>() );

	void add_index( int p_index);

	void index();
	void deindex();
	void generate_normals();
	void generate_tangents();

	void add_to_format(int p_flags) { format|=p_flags; }

	void set_material(const Ref<Material>& p_material);

	void clear();

	List< Vertex > &get_vertex_array() { return vertex_array; }

	void create_from(const Ref<Mesh>& p_existing, int p_surface);
	void append_from(const Ref<Mesh>& p_existing, int p_surface,const Transform& p_xform);
	Ref<Mesh> commit(const Ref<Mesh>& p_existing=Ref<Mesh>());

	SurfaceTool();
};


#endif