OgreVolumeMeshBuilder.h

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/*
-----------------------------------------------------------------------------
This source file is part of OGRE
(Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2014 Torus Knot Software Ltd

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. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-----------------------------------------------------------------------------
*/
#ifndef __Ogre_Volume_MeshBuilder_H__
#define __Ogre_Volume_MeshBuilder_H__

#include <vector>
#include "OgreSimpleRenderable.h"
#include "OgreManualObject.h"
#include "OgreRenderOperation.h"
#include "OgreVector3.h"
#include "OgreAxisAlignedBox.h"
#include "OgreSceneManager.h"
#include "OgreVolumePrerequisites.h"

namespace Ogre {
namespace Volume {

    typedef struct _OgreVolumeExport Vertex
    {
        Real x;
        
        Real y;
        
        Real z;
        
        Real nX;
        
        Real nY;
        
        Real nZ;

        Vertex(const Vector3 &v, const Vector3 &n) :
            x(v.x), y(v.y), z(v.z),
            nX(n.x), nY(n.y), nZ(n.z)
        {
        }
        Vertex()
        {
        }
    } Vertex;

    bool _OgreVolumeExport operator==(Vertex const& a, Vertex const& b);
    
    bool _OgreVolumeExport operator<(const Vertex& a, const Vertex& b);

    typedef vector<Vertex>::type VecVertex;

    typedef vector<size_t>::type VecIndices;

    class _OgreVolumeExport MeshBuilderCallback
    {
    public:
        virtual ~MeshBuilderCallback() {}

        virtual void ready(const SimpleRenderable *simpleRenderable, const VecVertex &vertices, const VecIndices &indices, size_t level, int inProcess) = 0;
    };

    class _OgreVolumeExport MeshBuilder : public UtilityAlloc
    {
    protected:

        static const unsigned short MAIN_BINDING;

        typedef map<Vertex, size_t>::type UMapVertexIndex;
        UMapVertexIndex mIndexMap;

        VecVertex mVertices;

        VecIndices mIndices;

        AxisAlignedBox mBox;

        bool mBoxInit;
        
        inline void addVertex(const Vertex &v)
        {
            size_t i = 0;
            if (mIndexMap.find(v) == mIndexMap.end())
            {
                i = mVertices.size();
                mIndexMap[v] = i;
                mVertices.push_back(v);

                // Update bounding box
                if (!mBoxInit)
                {
                    mBox.setExtents(v.x, v.y, v.z, v.x, v.y, v.z);
                    mBoxInit = true;
                }
                else
                {
                    if (v.x < mBox.getMinimum().x)
                    {
                        mBox.setMinimumX(v.x);
                    }
                    if (v.y < mBox.getMinimum().y)
                    {
                        mBox.setMinimumY(v.y);
                    }
                    if (v.z < mBox.getMinimum().z)
                    {
                        mBox.setMinimumZ(v.z);
                    }
                    if (v.x > mBox.getMaximum().x)
                    {
                        mBox.setMaximumX(v.x);
                    }
                    if (v.y > mBox.getMaximum().y)
                    {
                        mBox.setMaximumY(v.y);
                    }
                    if (v.z > mBox.getMaximum().z)
                    {
                        mBox.setMaximumZ(v.z);
                    }
                }
            }
            else
            {
                i = mIndexMap[v];
            }
            mIndices.push_back(i);
        }

    public:
        
        static inline void addCubeToManualObject(
            ManualObject *manual,
            const Vector3 &c0,
            const Vector3 &c1,
            const Vector3 &c2,
            const Vector3 &c3,
            const Vector3 &c4,
            const Vector3 &c5,
            const Vector3 &c6,
            const Vector3 &c7,
            uint32 &baseIndex
            )
        {
            manual->position(c0);
            manual->position(c1);
            manual->position(c2);
            manual->position(c3);
            manual->position(c4);
            manual->position(c5);
            manual->position(c6);
            manual->position(c7);

            manual->index(baseIndex + 0); manual->index(baseIndex + 1);
            manual->index(baseIndex + 1); manual->index(baseIndex + 2);
            manual->index(baseIndex + 2); manual->index(baseIndex + 3);
            manual->index(baseIndex + 3); manual->index(baseIndex + 0);
        
            manual->index(baseIndex + 4); manual->index(baseIndex + 5);
            manual->index(baseIndex + 5); manual->index(baseIndex + 6);
            manual->index(baseIndex + 6); manual->index(baseIndex + 7);
            manual->index(baseIndex + 7); manual->index(baseIndex + 4);
        
            manual->index(baseIndex + 0); manual->index(baseIndex + 4);
            manual->index(baseIndex + 1); manual->index(baseIndex + 5);
            manual->index(baseIndex + 2); manual->index(baseIndex + 6);
            manual->index(baseIndex + 3); manual->index(baseIndex + 7);
            baseIndex += 8;
        }

        MeshBuilder(void);
        
        inline void addTriangle(const Vector3 &v0, const Vector3 &n0, const Vector3 &v1, const Vector3 &n1, const Vector3 &v2, const Vector3 &n2)
        {
            addVertex(Vertex(v0, n0));
            addVertex(Vertex(v1, n1));
            addVertex(Vertex(v2, n2));
        }

        size_t generateBuffers(RenderOperation &operation);

        Entity* generateWithManualObject(SceneManager *sceneManager, const String &name, const String &material);

        AxisAlignedBox getBoundingBox(void);

        void executeCallback(MeshBuilderCallback *callback, const SimpleRenderable *simpleRenderable, size_t level, int inProcess) const;

    };
}
}

#endif