CMeshFast.cpp

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/* +---------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)               |
   |                          http://www.mrpt.org/                             |
   |                                                                           |
   | Copyright (c) 2005-2017, Individual contributors, see AUTHORS file        |
   | See: http://www.mrpt.org/Authors - All rights reserved.                   |
   | Released under BSD License. See details in http://www.mrpt.org/License    |
   +---------------------------------------------------------------------------+ */

#include "opengl-precomp.h"  // Precompiled header

#include <mrpt/poses/CPose3D.h>
#include <mrpt/opengl/CMeshFast.h>
#include <mrpt/opengl/CSetOfTriangles.h>
#include <mrpt/utils/color_maps.h>
#include <mrpt/utils/CStream.h>

#include "opengl_internals.h"

using namespace mrpt;
using namespace mrpt::opengl;
using namespace mrpt::utils;
using namespace mrpt::poses;
using namespace mrpt::math;
using namespace std;

IMPLEMENTS_SERIALIZABLE( CMeshFast, CRenderizableDisplayList, mrpt::opengl )

CMeshFastPtr CMeshFast::Create(bool enableTransparency, float xMin, float xMax , float yMin, float yMax )
{
        return CMeshFastPtr( new CMeshFast( enableTransparency, xMin ,xMax , yMin ,yMax ) );
}
void CMeshFast::updatePoints() const    {
        CRenderizableDisplayList::notifyChange();

        const size_t cols = Z.getColCount();
        const size_t rows = Z.getRowCount();

        if ((m_colorFromZ)||(m_isImage))
                updateColorsMatrix();

        ASSERT_((cols>0)&&(rows>0))
        ASSERT_((xMax>xMin)&&(yMax>yMin))

        X.setSize(rows,cols);
        Y.setSize(rows,cols);
        const float sCellX=(xMax-xMin)/(rows-1);
        const float sCellY=(yMax-yMin)/(cols-1);

        for (size_t iX=0;iX<rows;iX++)
                for (size_t iY=0;iY<cols;iY++)
                {
                        X(iX,iY) = xMin+iX*sCellX;
                        Y(iX,iY) = yMin+iY*sCellY;

                }

        pointsUpToDate = true;
}

/*---------------------------------------------------------------
                                                        render
  ---------------------------------------------------------------*/
void CMeshFast::render_dl() const       {
#if MRPT_HAS_OPENGL_GLUT

        if (!pointsUpToDate)
                updatePoints();

    ASSERT_(X.size() == Y.size());
    ASSERT_(X.size() == Z.size());

        if ( m_color.A != 255 )
        {
                glEnable(GL_BLEND);
                glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
        }

    glPointSize( m_pointSize );

    if (m_pointSmooth)
                glEnable ( GL_POINT_SMOOTH );
        else
                glDisable( GL_POINT_SMOOTH );

        // Disable lighting for point clouds:
        glDisable(GL_LIGHTING);

        glBegin( GL_POINTS );
        for (unsigned int i=0; i<X.getRowCount(); i++)
                for (unsigned int j=0; j<X.getColCount(); j++)
                {
                        if ( m_isImage && m_textureImage.isColor())
                                glColor4f(C_r(i,j), C_g(i,j), C_b(i,j), m_color.A/255.f);

                        else if (m_isImage)
                                glColor4f(C(i,j), C(i,j), C(i,j), m_color.A/255.f);

                        else if (m_colorFromZ)
                        {
                                float rz, gz, bz;
                                colormap(m_colorMap, C(i,j), rz, gz, bz);
                                glColor4f(rz, gz, bz, m_color.A/255.f);
                        }

                        else
                                glColor4f(m_color.R/255.f, m_color.G/255.f, m_color.B/255.f, m_color.A/255.f);

                        glVertex3f(X(i,j), Y(i,j), Z(i,j));
                }

        glEnd();

        glEnable(GL_LIGHTING);

        // Undo flags:
        if ( m_color.A != 255 )
                glDisable(GL_BLEND);

        if (m_pointSmooth)
                glDisable( GL_POINT_SMOOTH );

        checkOpenGLError();
#endif
}

/*---------------------------------------------------------------
                                                        assignImage
  ---------------------------------------------------------------*/
void  CMeshFast::assignImage(
        const CImage& img )
{
        MRPT_START

        // Make a copy:
        m_textureImage = img;

        // Delete content in Z
        Z.setSize( img.getHeight(), img.getWidth());
        Z.assign(0);

        //Update flags/states
        m_modified_Image = true;
        m_enableTransparency = false;
        m_colorFromZ = false;
        m_isImage = true;
        pointsUpToDate=false;


        CRenderizableDisplayList::notifyChange();

        MRPT_END
}

/*---------------------------------------------------------------
                                                        assign Image and Z
  ---------------------------------------------------------------*/
void  CMeshFast::assignImageAndZ( const CImage& img, const mrpt::math::CMatrixTemplateNumeric<float> &in_Z)
{
        MRPT_START

        ASSERT_((img.getWidth() == static_cast<size_t>(in_Z.cols()))&&(img.getHeight() == static_cast<size_t>(in_Z.rows())))

        Z = in_Z;

        // Make a copy:
        m_textureImage = img;

        //Update flags/states
        m_modified_Image = true;
        m_enableTransparency = false;
        m_colorFromZ = false;
        m_isImage = true;
        pointsUpToDate = false;


        CRenderizableDisplayList::notifyChange();

        MRPT_END
}

/*---------------------------------------------------------------
   Implements the writing to a CStream capability of
     CSerializable objects
  ---------------------------------------------------------------*/
void  CMeshFast::writeToStream(mrpt::utils::CStream &out,int *version) const
{

        if (version)
                *version = 0;
        else
        {
                writeToStreamRender(out);

                out << m_textureImage;
                out << m_isImage;
                out << xMin << xMax << yMin << yMax;
                out << X << Y << Z;  // We don't need to serialize C, it's computed
                out << m_enableTransparency;
                out << m_colorFromZ;
                out << int16_t(m_colorMap);
                out << m_pointSize;
                out << m_pointSmooth;
        }
}

/*---------------------------------------------------------------
        Implements the reading from a CStream capability of
                CSerializable objects
  ---------------------------------------------------------------*/
void  CMeshFast::readFromStream(mrpt::utils::CStream &in,int version)
{
        switch(version)
        {
                case 0:
                        {
                        readFromStreamRender(in);

                        in >> m_textureImage;
                        in >> m_isImage;

                        in >> xMin;
                        in >> xMax;
                        in >> yMin;
                        in >> yMax;

                        in >> X >> Y >> Z;
                        in >> m_enableTransparency;
                        in >> m_colorFromZ;

                        int16_t i;
                        in >> i;
                        m_colorMap =  TColormap(i);
                        in >> m_pointSize;
                        in >> m_pointSmooth;
                        m_modified_Z = true;
                        }

                        pointsUpToDate = false;
                        break;

                default:
                        MRPT_THROW_UNKNOWN_SERIALIZATION_VERSION(version)

        };
        CRenderizableDisplayList::notifyChange();
}


void CMeshFast::updateColorsMatrix() const
{
        if ((!m_modified_Z)&&(!m_modified_Image)) return;

        CRenderizableDisplayList::notifyChange();

        if (m_isImage)
        {
                const size_t cols = m_textureImage.getWidth();
                const size_t rows = m_textureImage.getHeight();

                if ((cols != Z.getColCount())||(rows != Z.getRowCount()))
                {
                        printf("\nTexture Image and Z sizes have to be equal");

                }
                else if (m_textureImage.isColor())
                {
                        C_r.setSize(rows, cols);
                        C_g.setSize(rows, cols);
                        C_b.setSize(rows, cols);
                        m_textureImage.getAsRGBMatrices(C_r, C_g, C_b);
                }
                else
                {
                        C.setSize(rows, cols);
                        m_textureImage.getAsMatrix(C);
                }
        }
        else
        {
                const size_t cols = Z.getColCount();
                const size_t rows = Z.getRowCount();

                C.setSize(rows,cols);

                // Color is proportional to difference between height of a cell and
                //  the mean of the nearby cells MEANS:
                C = Z;
                C.normalize(0.01f,0.99f);
        }


        m_modified_Image = false;
        m_modified_Z = false; // Done
        pointsUpToDate = false;
}

void CMeshFast::setZ( const mrpt::math::CMatrixTemplateNumeric<float> &in_Z )
{
        Z = in_Z;
        m_modified_Z = true;
        pointsUpToDate = false;

        //Delete previously loaded images
        m_isImage = false;

        CRenderizableDisplayList::notifyChange();
}


void CMeshFast::getBoundingBox(mrpt::math::TPoint3D &bb_min, mrpt::math::TPoint3D &bb_max) const
{
        bb_min.x = xMin;
        bb_min.y = yMin;
        bb_min.z = Z.minCoeff();

        bb_max.x = xMax;
        bb_max.y = yMax;
        bb_max.z = Z.maxCoeff();

        // Convert to coordinates of my parent:
        m_pose.composePoint(bb_min, bb_min);
        m_pose.composePoint(bb_max, bb_max);
}