trianglemesh.h

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/***************************************************************************
 *   Copyright (C) 1998-2010 by authors (see AUTHORS.txt )                 *
 *                                                                         *
 *   This file is part of LuxRays.                                         *
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 *   LuxRays 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 3 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   LuxRays 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.                          *
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 *   You should have received a copy of the GNU General Public License     *
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
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 *   LuxRays website: http://www.luxrender.net                             *
 ***************************************************************************/

#ifndef _LUXRAYS_TRIANGLEMESH_H
#define _LUXRAYS_TRIANGLEMESH_H

#include <cassert>
#include <cstdlib>

#include "luxrays/luxrays.h"
#include "luxrays/core/geometry/triangle.h"
#include "geometry/transform.h"

namespace luxrays {

typedef unsigned int TriangleMeshID;
typedef unsigned int TriangleID;

enum MeshType {
        TYPE_TRIANGLE, TYPE_TRIANGLE_INSTANCE,
        TYPE_EXT_TRIANGLE, TYPE_EXT_TRIANGLE_INSTANCE
};

class Mesh {
public:
        Mesh() { }
        virtual ~Mesh() { }

        virtual MeshType GetType() const = 0;

        virtual unsigned int GetTotalVertexCount() const = 0;
        virtual unsigned int GetTotalTriangleCount() const = 0;

        virtual BBox GetBBox() const = 0;
        virtual Point GetVertex(const unsigned int vertIndex) const = 0;
        virtual float GetTriangleArea(const unsigned int triIndex) const = 0;

        virtual Point *GetVertices() const = 0;
        virtual Triangle *GetTriangles() const = 0;
};

class TriangleMesh : public Mesh {
public:
        // NOTE: deleting meshVertices and meshIndices is up to the application
        TriangleMesh(const unsigned int meshVertCount, const unsigned int meshTriCount,
                        Point *meshVertices, Triangle *meshTris) {
                assert (meshVertCount > 0);
                assert (meshTriCount > 0);
                assert (meshVertices != NULL);
                assert (meshTris != NULL);

                vertCount = meshVertCount;
                triCount = meshTriCount;
                vertices = meshVertices;
                tris = meshTris;
        };
        virtual ~TriangleMesh() { };
        virtual void Delete() {
                delete[] vertices;
                delete[] tris;
        }

        virtual MeshType GetType() const { return TYPE_TRIANGLE; }
        unsigned int GetTotalVertexCount() const { return vertCount; }
        unsigned int GetTotalTriangleCount() const { return triCount; }

        BBox GetBBox() const;
        Point GetVertex(const unsigned int vertIndex) const { return vertices[vertIndex]; }
        float GetTriangleArea(const unsigned int triIndex) const { return tris[triIndex].Area(vertices); }

        Point *GetVertices() const { return vertices; }
        Triangle *GetTriangles() const { return tris; }

        static TriangleMesh *Merge(
                const std::deque<Mesh *> &meshes,
                TriangleMeshID **preprocessedMeshIDs = NULL,
                TriangleID **preprocessedMeshTriangleIDs = NULL);
        static TriangleMesh *Merge(
                const unsigned int totalVerticesCount,
                const unsigned int totalIndicesCount,
                const std::deque<Mesh *> &meshes,
                TriangleMeshID **preprocessedMeshIDs = NULL,
                TriangleID **preprocessedMeshTriangleIDs = NULL);

protected:
        unsigned int vertCount;
        unsigned int triCount;
        Point *vertices;
        Triangle *tris;
};

class InstanceTriangleMesh : public Mesh {
public:
        InstanceTriangleMesh(TriangleMesh *m, const Transform &t) {
                assert (mesh != NULL);

                trans = t;
                invTrans = t.GetInverse();
                mesh = m;
        };
        virtual ~InstanceTriangleMesh() { };

        virtual MeshType GetType() const { return TYPE_TRIANGLE_INSTANCE; }
        unsigned int GetTotalVertexCount() const { return mesh->GetTotalVertexCount(); }
        unsigned int GetTotalTriangleCount() const { return mesh->GetTotalTriangleCount(); }

        BBox GetBBox() const {
                return trans(mesh->GetBBox());
        }
        Point GetVertex(const unsigned int vertIndex) const { return trans(mesh->GetVertex(vertIndex)); }
        float GetTriangleArea(const unsigned int triIndex) const {
                const Triangle &tri = mesh->GetTriangles()[triIndex];

                return Triangle::Area(GetVertex(tri.v[0]), GetVertex(tri.v[1]), GetVertex(tri.v[2]));
        }

        const Transform &GetTransformation() const { return trans; }
        const Transform &GetInvTransformation() const { return invTrans; }
        Point *GetVertices() const { return mesh->GetVertices(); }
        Triangle *GetTriangles() const { return mesh->GetTriangles(); }
        TriangleMesh *GetTriangleMesh() const { return mesh; };

protected:
        Transform trans, invTrans;
        TriangleMesh *mesh;
};

}

#endif  /* _LUXRAYS_TRIANGLEMESH_H */

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