StaticMesh.cpp

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 /*
 * StaticMesh.cpp
 *
 *  Created on: 12.11.2008
 *      Author: Thomas Wiemann
 */

#include "lvr2/display/StaticMesh.hpp"

#include <cassert>

namespace lvr2
{

StaticMesh::StaticMesh(){

        m_normals.reset();
        m_faceNormals   = 0;
    m_blackColors   = 0;
        m_vertices.reset();
        m_colors.reset();
        m_faces.reset();

        m_numFaces      = 0;
        m_numVertices   = 0;
        m_numMaterials  = 0;

        m_finalized = false;
        m_haveMaterials = false;

        m_renderMode    = 0;

        m_nameList = -1;

}

StaticMesh::StaticMesh( ModelPtr model, string name )
    : Renderable( name )
{

    m_model = model;
    m_nameList = -1;
    m_blackColors   = 0;

    init( model->m_mesh );
        calcBoundingBox();
        compileColoredMeshList();
        compileWireframeList();
        compileNameList();

}

StaticMesh::StaticMesh( MeshBufferPtr mesh, string name )
    : Renderable( name )
{

    m_model = ModelPtr( new Model( mesh ) );
    m_nameList = -1;
    m_blackColors   = 0;
    init( mesh );

    calcBoundingBox();
    compileColoredMeshList();
    compileWireframeList();
    compileNameList();

}

void StaticMesh::init( MeshBufferPtr mesh )
{
        m_lineWidth = 2.0;
        if(mesh)
        {
                m_faceNormals = 0;
        m_numVertices = mesh->numVertices();
        m_numFaces = mesh->numFaces();
        size_t w_color;

                m_normals                       = mesh->getVertexNormals();
                m_colors                = mesh->getVertexColors(w_color);

        // does only support RGB vertex colors
        assert(w_color == 3);

                m_vertices              = mesh->getVertices();
                m_faces                 = mesh->getFaceIndices();
                m_blackColors           = new unsigned char[ 3 * m_numVertices ];

                for ( size_t i = 0; i < 3 * m_numVertices; i++ ) 
                {
                        m_blackColors[i] = 0;
                }

                m_finalized                     = true;
                m_visible                       = true;
                m_active                        = true;

                m_renderMode = 0;
                m_renderMode    |= RenderSurfaces;
                m_renderMode    |= RenderTriangles;

                m_boundingBox = new BoundingBox<Vec>;

                if(!m_faceNormals)
                {
                        interpolateNormals();
                } else
                {
                        // cout << "Face normals: " << m_faceNormals << endl;
                }

                if(!m_colors)
                {
                        setDefaultColors();
                }
        }
}


StaticMesh::StaticMesh(const StaticMesh &o)
{
        if( m_faceNormals != 0 )
          {
            delete[] m_faceNormals;
          }

        m_faceNormals = new float[3 * o.m_numVertices];
        m_vertices    = floatArr( new float[3 * o.m_numVertices] );
        m_colors      = ucharArr( new unsigned char[3 * o.m_numVertices] );
        m_faces     = indexArray(  new unsigned int[3 * o.m_numFaces] );

        for ( size_t i(0); i < 3 * o.m_numVertices; i++ )
        {
                m_faceNormals[i] = o.m_faceNormals[i];
                m_vertices[i]    = o.m_vertices[i];
                m_colors[i]      = o.m_colors[i];
        }

        for( size_t i = 0; i < 3 * o.m_numFaces; ++i )
        {
                m_faces[i] = o.m_faces[i];
        }

        m_boundingBox = o.m_boundingBox;
        m_model = o.m_model;

}

void StaticMesh::setColorMaterial(float r, float g, float b)
{
        float ambient_color[] = {r, g, b};
        float diffuse_color[] = {0.45f * r, 0.5f * g, 0.55f * b};

        float specular_color[] = {0.1f, 0.15f, 0.1f};
        float shine[] = {0.1f};

        glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, ambient_color);
        glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, diffuse_color);
        glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, specular_color);
        glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, shine);
}


StaticMesh::~StaticMesh(){
    if (m_blackColors)
        delete[] m_blackColors;

    if (m_faceNormals)
        delete[] m_faceNormals;
}

void StaticMesh::finalize(){

}

void StaticMesh::compileWireframeList()
{
    if(m_finalized){

        m_wireframeList = glGenLists(1);

        // Start new display list
        glNewList(m_wireframeList, GL_COMPILE);

        glDisable(GL_LIGHTING);
        glDisable(GL_TEXTURE_2D);
        glColor3f(0.0, 0.0, 0.0);

        for(size_t i = 0; i < m_numFaces; i++)
        {
            size_t index = 3 * i;
            int a = 3 * m_faces[index];
            int b = 3 * m_faces[index + 1];
            int c = 3 * m_faces[index + 2];
            glBegin(GL_TRIANGLES);
            glVertex3f(m_vertices[a], m_vertices[a + 1], m_vertices[a + 2]);
            glVertex3f(m_vertices[b], m_vertices[b + 1], m_vertices[b + 2]);
            glVertex3f(m_vertices[c], m_vertices[c + 1], m_vertices[c + 2]);
            glEnd();

        }
        glEnable(GL_LIGHTING);
        glEnable(GL_TEXTURE_2D);
        glEndList();

    }
}


void StaticMesh::compileColoredMeshList(){

        if(m_finalized){

                m_coloredMeshList = glGenLists(1);

                // Enable vertex / normal / color arrays
                glEnableClientState(GL_VERTEX_ARRAY);
                glEnableClientState(GL_NORMAL_ARRAY);
                glEnableClientState(GL_COLOR_ARRAY);

                // Start new display list
                glNewList(m_coloredMeshList, GL_COMPILE);

                glEnable(GL_LIGHTING);
                glEnable(GL_COLOR_MATERIAL);

                setColorMaterial(0.1f, 0.1f, 0.1f);

                // Assign element pointers
                glVertexPointer( 3, GL_FLOAT, 0, m_vertices.get() );
                glNormalPointer( GL_FLOAT, 0, m_faceNormals );
                glColorPointer( 3, GL_UNSIGNED_BYTE, 0, m_colors.get() );

                // Draw elements
                glDrawElements(GL_TRIANGLES, (GLsizei)3 * m_numFaces, GL_UNSIGNED_INT, m_faces.get());


                // Draw mesh descriptions


                glEndList();

        }
}

void StaticMesh::setName(string name)
{
        m_name = name;
        compileNameList();
}

void StaticMesh::compileNameList()
{
        // Release old name list
        if(m_nameList != -1)
        {
                glDeleteLists(m_nameList, 1);
        }

        // Compile a new one
        m_nameList = glGenLists(1);
        glNewList(m_nameList, GL_COMPILE);
        Vec v = m_boundingBox->getCentroid();
        glDisable(GL_LIGHTING);
        glColor3f(1.0, 1.0, 0.0);
        glRasterPos3f(v.x, v.y, v.z);
        for(int i = 0; i < Name().size(); i++)
        {
                //glutBitmapCharacter(GLUT_BITMAP_HELVETICA_12, Name()[i]);
        }
        glEnable(GL_LIGHTING);
        glEndList();
}

void StaticMesh::interpolateNormals()
{

        // Be sure that vertex and indexbuffer exist
        assert(m_vertices);
        assert(m_faces);

        // Alloc new normal array
        m_faceNormals = new float[3 * m_numVertices];
        memset(m_faceNormals, 0, 3 * m_numVertices * sizeof(float));

        // Interpolate surface m_normals for each face
        // and interpolate sum up the normal coordinates
        // at each vertex position
        size_t a, b, c, buffer_pos;
        for(size_t i = 0; i < m_numFaces; i++)
        {
                buffer_pos = i * 3;

                // Interpolate a perpendicular vector to the
                // current triangle (p)
                //
                // CAUTION:
                // --------
                // buffer_pos is the face number
                // to get real position of the vertex in the buffer
                // we have to remember, that each vertex has three
                // coordinates!         cout << 1 << endl;
                a = m_faces[buffer_pos]     * 3;
                b = m_faces[buffer_pos + 1] * 3;
                c = m_faces[buffer_pos + 2] * 3;

                Vec v0(m_vertices[a], m_vertices[a + 1], m_vertices[a + 2]);
                Vec v1(m_vertices[b], m_vertices[b + 1], m_vertices[b + 2]);
                Vec v2(m_vertices[c], m_vertices[c + 1], m_vertices[c + 2]);

                Vec d1 = v0 - v1;
                Vec d2 = v2 - v1;

                Normal<float> p(d1.cross(d2));
                p = p * -1;

                // Sum up coordinate values in normal array
                m_faceNormals[a    ] = p.x;
                m_faceNormals[a + 1] = p.y;
                m_faceNormals[a + 2] = p.z;

                m_faceNormals[b    ] = p.x;
                m_faceNormals[b + 1] = p.y;
                m_faceNormals[b + 2] = p.z;

                m_faceNormals[c    ] = p.x;
                m_faceNormals[c + 1] = p.y;
                m_faceNormals[c + 2] = p.z;

        }

        // Normalize
        for(size_t i = 0; i < m_numVertices; i++)
        {
                Normal<float> n(m_faceNormals[i * 3], m_faceNormals[i * 3 + 1], m_faceNormals[i * 3 + 2]);
                m_faceNormals[i * 3]     = n.x;
                m_faceNormals[i * 3 + 1] = n.y;
                m_faceNormals[i * 3 + 2] = n.z;
        }

}

void StaticMesh::setDefaultColors()
{
    m_colors = ucharArr( new unsigned char[3 * m_numVertices] );
    for(size_t i = 0; i < m_numVertices; i++)
    {
        m_colors[i*3 + 0] = 0;
        m_colors[i*3 + 1] = 255;
        m_colors[i*3 + 2] = 0;
    }
}

void StaticMesh::calcBoundingBox()
{
    for(size_t i = 0; i < m_numVertices; i++)
    {
        m_boundingBox->expand(Vec(
                m_vertices[3 * i],
                m_vertices[3 * i + 1],
                m_vertices[3 * i + 2] ));

    }
}

uintArr StaticMesh::getIndices()
{

    return m_finalized ? m_faces : uintArr();

}

floatArr StaticMesh::getVertices()
{

    return m_finalized ? m_vertices : floatArr();

}

float* StaticMesh::getNormals()
{

    return m_finalized ? m_faceNormals : 0;

}

size_t StaticMesh::getNumberOfVertices()
{
        return m_numVertices;
}
size_t StaticMesh::getNumberOfFaces()
{
        return m_numFaces;
}

void StaticMesh::savePLY(string filename)
{

}


} // namespace lvr2