OgreVolumeCSGSource.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) 2000-2013 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_CSGSource_H__
#define __Ogre_Volume_CSGSource_H__

#include "OgreVolumeSource.h"
#include "OgreVector3.h"
#include "OgreAxisAlignedBox.h"
#include "OgreVolumePrerequisites.h"
#include "OgreVolumeSimplexNoise.h"

namespace Ogre {
namespace Volume {

    class _OgreVolumeExport CSGSphereSource : public Source
    {
    protected:
        const Real mR;
        
        const Vector3 mCenter;
    public:
    
        CSGSphereSource(const Real r, const Vector3 &center);
        
        virtual Vector4 getValueAndGradient(const Vector3 &position) const;

        virtual Real getValue(const Vector3 &position) const;
    };

    class _OgreVolumeExport CSGPlaneSource : public Source
    {
    protected:
        
        const Real mD;
        
        Vector3 mNormal;

    public:
        
        CSGPlaneSource(const Real d, const Vector3 &normal);
        
        virtual Vector4 getValueAndGradient(const Vector3 &position) const;

        virtual Real getValue(const Vector3 &position) const;
    };

    class _OgreVolumeExport CSGCubeSource : public Source
    {
    protected:
    
        static Vector3 mBoxNormals[6];
        
        AxisAlignedBox mBox;

        inline Real distanceTo(const Vector3 &position) const
        {
            Real distance;
            const Vector3 dMin = position - mBox.getMinimum();
            const Vector3 dMax = mBox.getMaximum() - position;

            // Check if inside of the box
            if (dMin.x >= (Real)0.0 && dMin.y >= (Real)0.0 && dMin.z >= (Real)0.0 &&
                dMax.x >= (Real)0.0 && dMax.y >= (Real)0.0 && dMax.z >= (Real)0.0)
            {
                const Real d[6] = {dMin.x, dMin.y, dMin.z, dMax.x, dMax.y, dMax.z};
                distance = Math::POS_INFINITY;
                for (size_t i = 0; i < 6; ++i)
                {
                    if (d[i] < distance)
                    {
                        distance = d[i];
                    }
                }
            }
            else
            {
                distance = -mBox.distance(position);
            }
            return distance;
        }

    public:
    
        CSGCubeSource(const Vector3 &min, const Vector3 &max);
        
        virtual Vector4 getValueAndGradient(const Vector3 &position) const;

        virtual Real getValue(const Vector3 &position) const;
    };

    class _OgreVolumeExport CSGOperationSource : public Source
    {
    protected:
    
        const Source *mA;
        
        const Source *mB;
        
        CSGOperationSource(const Source *a, const Source *b);

        CSGOperationSource(void);
    public:
        
        virtual const Source* getSourceA() const;
        
        virtual void setSourceA(Source *a);

        virtual const Source* getSourceB(void) const;
        
        virtual void setSourceB(Source *b);
    };

    class _OgreVolumeExport CSGIntersectionSource : public CSGOperationSource
    {
    public:
    
        CSGIntersectionSource(const Source *a, const Source *b);

        CSGIntersectionSource(void);
        
        virtual Vector4 getValueAndGradient(const Vector3 &position) const;

        virtual Real getValue(const Vector3 &position) const;
    };

    class _OgreVolumeExport CSGUnionSource : public CSGOperationSource
    {
    public:
    
        CSGUnionSource(const Source *a, const Source *b);

        CSGUnionSource(void);
        
        virtual Vector4 getValueAndGradient(const Vector3 &position) const;

        virtual Real getValue(const Vector3 &position) const;
    };

    class _OgreVolumeExport CSGDifferenceSource : public CSGOperationSource
    {
    public:
    
    
        CSGDifferenceSource(const Source *a, const Source *b);

        CSGDifferenceSource(void);
        
        virtual Vector4 getValueAndGradient(const Vector3 &position) const;

        virtual Real getValue(const Vector3 &position) const;
    };

    class _OgreVolumeExport CSGUnarySource : public Source
    {
    protected:
    
        const Source *mSrc;
        
        CSGUnarySource(const Source *src);

        CSGUnarySource(void);

    public:

        virtual const Source* getSource(void) const;
        
        virtual void setSource(Source *a);
    };

    class _OgreVolumeExport CSGNegateSource : public CSGUnarySource
    {
    public:
    
        explicit CSGNegateSource(const Source *src);
        
        CSGNegateSource(void);
        
        virtual Vector4 getValueAndGradient(const Vector3 &position) const;

        virtual Real getValue(const Vector3 &position) const;
    };

    class _OgreVolumeExport CSGScaleSource : public CSGUnarySource
    {
    protected:
        
        Real mScale;
    public:

        CSGScaleSource(const Source *src, const Real scale);
        
        virtual Vector4 getValueAndGradient(const Vector3 &position) const;

        virtual Real getValue(const Vector3 &position) const;
    };

    class _OgreVolumeExport CSGNoiseSource: public CSGUnarySource
    {
    protected:
        
        Real *mFrequencies;

        Real *mAmplitudes;
        
        size_t mNumOctaves;
        
        SimplexNoise mNoise;

        Real mGradientOff;

        long mSeed;

        void setData(void);

        /* Gets the density value.
        @param position
            The position of the value.
        @return
            The value.
        */
        inline Real getInternalValue(const Vector3 &position) const
        {
            Real toAdd = (Real)0.0;
            for (size_t i = 0; i < mNumOctaves; ++i)
            {
                toAdd += mNoise.noise(position.x * mFrequencies[i], position.y * mFrequencies[i], position.z * mFrequencies[i]) * mAmplitudes[i];
            }
            return mSrc->getValue(position) + toAdd;
        }

    public:
        
        CSGNoiseSource(const Source *src, Real *frequencies, Real *amplitudes, size_t numOctaves, long seed);
                
        CSGNoiseSource(const Source *src, Real *frequencies, Real *amplitudes, size_t numOctaves);
                
        virtual Vector4 getValueAndGradient(const Vector3 &position) const;

        virtual Real getValue(const Vector3 &position) const;
        
        long getSeed(void) const;
    };

}
}

#endif