meshmodifier.h

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/*
    Sheep - A Rigid Body Dynamics Engine
    Copyright (C) 2001-2004 Francois Beaune
    Contact: http://toxicengine.sourceforge.net/

    This file is part of Sheep.

    Sheep is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    Sheep is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Sheep; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef SHEEP_MESHIO_MESHMODIFIER_H
#define SHEEP_MESHIO_MESHMODIFIER_H

#include "common/math/point3.h"
#include "common/math/real.h"
#include "common/math/vector2.h"
#include "common/math/vector3.h"
#include "imeshbuilder.h"

#include <string>
#include <vector>

namespace sheep {

    class MeshModifier :
        public IMeshBuilder,
        public IMeshBuilder::IGeometryBuilder,
        public IMeshBuilder::IMaterialBuilder
    {
    public:
        MeshModifier(IMeshBuilder &builder);
        virtual ~MeshModifier();

        //! 'smoothing_threshold' is expressed in radians.
        void ComputeSmoothedVertexNormals(sheep::Real smoothing_threshold_angle);

        //! 'vertex_welding_threshold' is expressed in distance units.
        //! 'normal_welding_threshold' is expressed in radians.
        void OptimizeMesh(
            sheep::Real vertex_welding_threshold_dist,
            sheep::Real normal_welding_threshold_angle
        );

        // IMeshBuilder interface.

        virtual IGeometryBuilder *GeometryBuilder();
        virtual IMaterialBuilder *MaterialBuilder();

        // IGeometryBuilder interface.

        virtual void BeginSubMesh(const std::string &name);
        virtual void EndSubMesh();

        virtual FeatureId AppendVertex(const Vector3 &v);
        virtual FeatureId AppendNormal(const Vector3 &vn);
        virtual FeatureId AppendTexCoord(const Vector2 &vt);
        virtual FeatureId AppendFace(int n, const FeatureId *v);

        virtual void SetFaceNormals(FeatureId face, int n, const FeatureId *vn);
        virtual void SetFaceTexCoords(FeatureId face, int n, const FeatureId *vt);

        virtual void SetMaterial(FeatureId material);

        // IMaterialBuilder interface.

        virtual FeatureId BeginMaterial(const std::string &name);
        virtual void EndMaterial();

        virtual void SetAmbientColor(Real r, Real g, Real b);
        virtual void SetDiffuseColor(Real r, Real g, Real b);
        virtual void SetSpecularColor(Real r, Real g, Real b);

        virtual void SetTexture(int w, int h, const unsigned char *texels); //!< 24-bit RGB format.

    private:
        struct sub_mesh {
            struct face {
                FeatureId m_v0, m_v1, m_v2;
                FeatureId m_n0, m_n1, m_n2;
                FeatureId m_t0, m_t1, m_t2;
            };

            std::string m_name;
            FeatureId m_material;

            std::vector<sheep::Point3> m_vertices;
            std::vector<sheep::Vector3> m_normals;
            std::vector<sheep::Vector2> m_texcoords;
            std::vector<face> m_faces;

            void ComputeSmoothedVertexNormals(sheep::Real smoothing_threshold_angle);
            void OptimizeVertices(sheep::Real welding_threshold_dist);
            void OptimizeNormals(sheep::Real welding_threshold_angle);
            void OptimizeFaces();
        };

        sub_mesh *m_sub_mesh;   //!< Current sub mesh being defined.

        IMeshBuilder &m_builder;

        //! Vertex normals smoothing settings.
        bool m_compute_smoothed_vn;
        sheep::Real m_smoothing_threshold_angle;    //!< Expressed in radians.

        //! Mesh optimization settings.
        bool m_optimize_mesh;
        sheep::Real m_vertex_welding_threshold_dist;    //!< Expressed in distance units.
        sheep::Real m_normal_welding_threshold_angle;   //!< Expressed in radians.
    };

#include "meshmodifier.inl"

}

#endif  // !SHEEP_MESHIO_MESHMODIFIER_H

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