OgrePatchSurface.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) 2000-2012 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 __PatchSurface_H__
#define __PatchSurface_H__

#include "OgrePrerequisites.h"

#include "OgreVector3.h"
#include "OgreString.h"
#include "OgreRenderOperation.h"
#include "OgreAxisAlignedBox.h"

namespace Ogre {

    class _OgreExport PatchSurface : public PatchAlloc
    {
    public:
        PatchSurface();
        ~PatchSurface();

        enum PatchSurfaceType
        {
            PST_BEZIER
        };

        enum
        {
            AUTO_LEVEL = -1
        };

        enum VisibleSide {
            VS_FRONT,
            VS_BACK,
            VS_BOTH
        };
        void defineSurface(void* controlPointBuffer, 
            VertexDeclaration *declaration, size_t width, size_t height,
            PatchSurfaceType pType = PST_BEZIER, 
            size_t uMaxSubdivisionLevel = AUTO_LEVEL, size_t vMaxSubdivisionLevel = AUTO_LEVEL,
            VisibleSide visibleSide = VS_FRONT);

        size_t getRequiredVertexCount(void) const;
        size_t getRequiredIndexCount(void) const;

        size_t getCurrentIndexCount(void) const;
        size_t getIndexOffset(void) const { return mIndexOffset; }
        size_t getVertexOffset(void) const { return mVertexOffset; }


        const AxisAlignedBox& getBounds(void) const;
        Real getBoundingSphereRadius(void) const;
        void build(HardwareVertexBufferSharedPtr destVertexBuffer, size_t vertexStart,
            HardwareIndexBufferSharedPtr destIndexBuffer, size_t indexStart);

        void setSubdivisionFactor(Real factor);

        Real getSubdivisionFactor(void) const;

        void* getControlPointBuffer(void) const
        {
            return mControlPointBuffer;
        }
        void notifyControlPointBufferDeallocated(void) { 
            mControlPointBuffer = 0;
        }
    protected:
        VertexDeclaration* mDeclaration;
        void* mControlPointBuffer;
        PatchSurfaceType mType;
        size_t mCtlWidth;
        size_t mCtlHeight;
        size_t mCtlCount;
        size_t mULevel;
        size_t mVLevel;
        size_t mMaxULevel;
        size_t mMaxVLevel;
        size_t mMeshWidth;
        size_t mMeshHeight;
        VisibleSide mVSide;

        Real mSubdivisionFactor;

        vector<Vector3>::type mVecCtlPoints;

        size_t findLevel( Vector3& a, Vector3& b, Vector3& c);

        void distributeControlPoints(void* lockedBuffer);
        void subdivideCurve(void* lockedBuffer, size_t startIdx, size_t stepSize, size_t numSteps, size_t iterations);
        void interpolateVertexData(void* lockedBuffer, size_t leftIndex, size_t rightIndex, size_t destIndex);
        void makeTriangles(void);

        size_t getAutoULevel(bool forMax = false);
        size_t getAutoVLevel(bool forMax = false);

        HardwareVertexBufferSharedPtr mVertexBuffer;
        HardwareIndexBufferSharedPtr mIndexBuffer;
        size_t mVertexOffset;
        size_t mIndexOffset;
        size_t mRequiredVertexCount;
        size_t mRequiredIndexCount;
        size_t mCurrIndexCount;

        AxisAlignedBox mAABB;
        Real mBoundingSphere;



    };

} // namespace

#endif