surface_tool.h

/*************************************************************************/
/*  surface_tool.h                                                       */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur.                 */
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/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
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/* distribute, sublicense, and/or sell copies of the Software, and to    */
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/*************************************************************************/
#ifndef SURFACE_TOOL_H
#define SURFACE_TOOL_H

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


class SurfaceTool : public Reference {

    OBJ_TYPE(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_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