CPointArray.h

Go to the documentation of this file.

//==============================================================================
/*
    Software License Agreement (BSD License)
    Copyright (c) 2003-2016, CHAI3D.
    (www.chai3d.org)

    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

    * Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above
    copyright notice, this list of conditions and the following
    disclaimer in the documentation and/or other materials provided
    with the distribution.

    * Neither the name of CHAI3D nor the names of its contributors may
    be used to endorse or promote products derived from this software
    without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
    FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
    COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
    BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
    ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE. 

    \author    <http://www.chai3d.org>
    \author    Francois Conti
    \version   3.2.0 $Rev: 2015 $
*/
//==============================================================================

//------------------------------------------------------------------------------
#ifndef CPointArrayH
#define CPointArrayH
//------------------------------------------------------------------------------
#include "graphics/CGenericArray.h"
//------------------------------------------------------------------------------

//------------------------------------------------------------------------------
namespace chai3d {
//------------------------------------------------------------------------------

//------------------------------------------------------------------------------
class cGenericObject;
class cCollisionRecorder;
struct cCollisionSettings;
//------------------------------------------------------------------------------

//==============================================================================
//==============================================================================

//------------------------------------------------------------------------------
class cPointArray;
typedef std::shared_ptr<cPointArray> cPointArrayPtr;
//------------------------------------------------------------------------------

//==============================================================================
//==============================================================================
class cPointArray : public cGenericArray
{
    //--------------------------------------------------------------------------
    // CONSTRUCTOR & DESTRUCTOR:
    //--------------------------------------------------------------------------

public:

    //--------------------------------------------------------------------------
    //--------------------------------------------------------------------------
    cPointArray(cVertexArrayPtr a_vertexArray) : cGenericArray(a_vertexArray)
    {
        // clear all points
        clear();

        // store pointer to vertex array
        m_vertices = a_vertexArray;

        // initialize OpenGL buffer ID
        m_elementBuffer         = 0;
    }


    //--------------------------------------------------------------------------
    //--------------------------------------------------------------------------
    ~cPointArray(){}


    void clear()
    {
        m_allocated.clear();
        m_indices.clear();
        m_freeElements.clear();
        m_flagMarkForResize     = true;
    }


    static cPointArrayPtr create(cVertexArrayPtr a_vertexArray) { return (std::make_shared<cPointArray>(a_vertexArray)); }


    //--------------------------------------------------------------------------
    // PUBLIC METHODS:
    //--------------------------------------------------------------------------

public:

    virtual unsigned int getNumVerticesPerElement() { return (1); }

    cPointArrayPtr copy();

    void compress();


    //--------------------------------------------------------------------------
    //--------------------------------------------------------------------------
    int newPoint(const unsigned int a_vertexIndex0)
    {
        int index;

        // check if there is an available slot on the free point list
        if (m_freeElements.size() > 0)
        {
            index = m_freeElements.front();
            m_allocated[index] = true;
            m_freeElements.pop_front();
            setVertex(index, a_vertexIndex0);
        }
        else
        {
            // store new indices
            m_indices.push_back(a_vertexIndex0);
            m_allocated.push_back(true);

            m_flagMarkForResize = true;

            // store index of new point
            index = (int)(m_allocated.size())-1;
        }

        // mark for update
        m_flagMarkForUpdate = true;

        // return index number to new point
        return (index);
    }


    //--------------------------------------------------------------------------
    //--------------------------------------------------------------------------
    void removePoint(const unsigned int a_pointIndex)
    {
        // sanity check
        if (m_allocated[a_pointIndex])
        {
            // disable point
            m_allocated[a_pointIndex] = false;

            // reset index to vertex
            setVertex(a_pointIndex, 0);

            // add point to free list
            m_freeElements.push_back(a_pointIndex);

            // mark for update
            m_flagMarkForUpdate = true;
        }
    }


    //--------------------------------------------------------------------------
    //--------------------------------------------------------------------------
    inline void setVertex(const unsigned int a_pointIndex,
                           const unsigned int a_vertexIndex)
    {
        m_indices[a_pointIndex] = a_vertexIndex;

        // mark for update
        m_flagMarkForUpdate = true;
    }


    //--------------------------------------------------------------------------
    //--------------------------------------------------------------------------
    inline unsigned int getVertexIndex0(const unsigned int a_pointIndex) const
    {
        return (m_indices[a_pointIndex]);
    };


    //--------------------------------------------------------------------------
    //--------------------------------------------------------------------------
    virtual unsigned int getVertexIndex(const unsigned int a_elementIndex,
                                        const unsigned int a_vertexNumber) const
    {
        switch (a_vertexNumber)
        {
            case 0 : return (m_indices[a_elementIndex]);
            default: return (0);
        }
    }


    //--------------------------------------------------------------------------
    //--------------------------------------------------------------------------
    cVector3d getTexCoordAtPosition(const unsigned int a_pointIndex, 
                                    const cVector3d& a_localPos)
    {
        cVector3d texCoord;

        if (m_vertices->getUseTexCoordData())
        {
            texCoord = m_vertices->getTexCoord(getVertexIndex0(a_pointIndex));
        }
        else
        {
            texCoord.set(0.0, 0.0, 0.0);
        }

        // return result
        return (texCoord);
    }


    //--------------------------------------------------------------------------
    //--------------------------------------------------------------------------
    inline void render()
    { 
#ifdef C_USE_OPENGL
        unsigned int numPoints = getNumElements();

        // allocate object and buffers if needed
        if (m_elementBuffer == 0)
        {
            glGenBuffers(1, &m_elementBuffer);
        }

        // bind buffer
        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_elementBuffer);

        // update buffer size if needed
        if (m_flagMarkForResize)
        {
            glBufferData(GL_ELEMENT_ARRAY_BUFFER, numPoints * sizeof(unsigned int), &(m_indices[0]), GL_STATIC_DRAW);
            m_flagMarkForResize = true;
        }

        // update data if needed
        if (m_flagMarkForUpdate)
        {
            glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_elementBuffer);
            glBufferSubData(GL_ELEMENT_ARRAY_BUFFER, 0, numPoints * sizeof(unsigned int), &(m_indices[0]));

            m_flagMarkForUpdate = false;
        }

        // render object
        m_vertices->renderInitialize();
        
        glEnableClientState(GL_VERTEX_ARRAY);
        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_elementBuffer);
        glDrawElements(GL_POINTS, numPoints, GL_UNSIGNED_INT, (void*)0);
        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

        m_vertices->renderFinalize();
#endif
    }

    virtual bool computeCollision(const unsigned int a_elementIndex,
                                  cGenericObject* a_object,
                                  cVector3d& a_segmentPointA,
                                  cVector3d& a_segmentPointB,
                                  cCollisionRecorder& a_recorder,
                                  cCollisionSettings& a_settings) const;
};

//------------------------------------------------------------------------------
} // namespace chai3d
//------------------------------------------------------------------------------

//------------------------------------------------------------------------------
#endif
//------------------------------------------------------------------------------