ParticlePrimitive.cpp

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// Copyright (C) 2005 Dave Griffiths
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

#include "Renderer.h"
#include "ParticlePrimitive.h"
#include "State.h"

using namespace Fluxus;
    
ParticlePrimitive::ParticlePrimitive() 
{
    AddData("p",new TypedPData<dVector>);
    AddData("c",new TypedPData<dColour>);
    AddData("s",new TypedPData<dVector>);
    
    // direct access for speed
    PDataDirty();
}

ParticlePrimitive::ParticlePrimitive(const ParticlePrimitive &other) :
Primitive(other) 
{
    PDataDirty();
}

ParticlePrimitive::~ParticlePrimitive()
{
}

ParticlePrimitive* ParticlePrimitive::Clone() const 
{
    return new ParticlePrimitive(*this); 
}

void ParticlePrimitive::PDataDirty()
{   
    m_VertData=GetDataVec<dVector>("p");
    m_ColData=GetDataVec<dColour>("c");
    m_SizeData=GetDataVec<dVector>("s");
}

void ParticlePrimitive::Render()
{
    glDisable(GL_LIGHTING);
    
    if (m_State.Hints & HINT_POINTS)
    {
        glDisableClientState(GL_NORMAL_ARRAY);
        glDisableClientState(GL_TEXTURE_COORD_ARRAY);
        glEnableClientState(GL_COLOR_ARRAY);
    
        glVertexPointer(3,GL_FLOAT,sizeof(dVector),(void*)m_VertData->begin()->arr());
        glColorPointer(4,GL_FLOAT,sizeof(dColour),(void*)m_ColData->begin()->arr());
    
        //glEnable(GL_BLEND);
        //glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
        //glHint(GL_POINT_SMOOTH_HINT,GL_NICEST);   
    
        if (m_State.Hints & HINT_AALIAS) glEnable(GL_POINT_SMOOTH); 
        else glDisable(GL_POINT_SMOOTH);    

        glDrawArrays(GL_POINTS,0,m_VertData->size());

        glDisableClientState(GL_COLOR_ARRAY);
        glEnableClientState(GL_NORMAL_ARRAY);
        glEnableClientState(GL_TEXTURE_COORD_ARRAY);
    }
    
    if (m_State.Hints & HINT_SOLID)
    {
        dMatrix ModelView;
        glGetFloatv(GL_MODELVIEW_MATRIX,ModelView.arr());
        ModelView = ModelView.inverse();
        
        dVector CameraDir(0,0,1);
        CameraDir=ModelView.transform_no_trans(CameraDir);
        CameraDir.normalise();
        
        dVector up(0,1,0);
        up = ModelView.transform(up);
        dVector across=up.cross(CameraDir);
        across.normalise();
        dVector down=across.cross(CameraDir);
        down.normalise();
        
        glBegin(GL_QUADS);
        for (unsigned int n=0; n<m_VertData->size(); n++)
        {
            dVector scaledacross(across*(*m_SizeData)[n].x*0.5);
            dVector scaledown(down*(*m_SizeData)[n].y*0.5);
            glColor3fv((*m_ColData)[n].arr());
            glTexCoord2f(0,0);
            glVertex3fv(((*m_VertData)[n]-scaledacross-scaledown).arr());
            glTexCoord2f(0,1);
            glVertex3fv(((*m_VertData)[n]-scaledacross+scaledown).arr());
            glTexCoord2f(1,1);
            glVertex3fv(((*m_VertData)[n]+scaledacross+scaledown).arr());
            glTexCoord2f(1,0);
            glVertex3fv(((*m_VertData)[n]+scaledacross-scaledown).arr());
        }
        glEnd();
    }
    glEnable(GL_LIGHTING);
}

dBoundingBox ParticlePrimitive::GetBoundingBox()
{   
    dBoundingBox box;
    for (vector<dVector>::iterator i=m_VertData->begin(); i!=m_VertData->end(); ++i)
    {
        box.expand(*i);
    }
    return box;
}

void ParticlePrimitive::ApplyTransform(bool ScaleRotOnly)
{
    if (!ScaleRotOnly)
    {
        for (vector<dVector>::iterator i=m_VertData->begin(); i!=m_VertData->end(); ++i)
        {
            *i=GetState()->Transform.transform(*i);
        }
    }
    else
    {
        for (vector<dVector>::iterator i=m_VertData->begin(); i!=m_VertData->end(); ++i)
        {
            *i=GetState()->Transform.transform_no_trans(*i);
        }
    }
    
    GetState()->Transform.init();
}

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