OSGPolygonBackground.cpp

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/*---------------------------------------------------------------------------*\
 *                                OpenSG                                     *
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 *               Copyright (C) 2000-2002 by the OpenSG Forum                 *
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 *   contact: dirk@opensg.org, gerrit.voss@vossg.org, jbehr@zgdv.de          *
 *                                                                           *
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/*---------------------------------------------------------------------------*\
 *                                License                                    *
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 * This library is free software; you can redistribute it and/or modify it   *
 * under the terms of the GNU Library General Public License as published    *
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 * This library 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         *
 * Library General Public License for more details.                          *
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\*---------------------------------------------------------------------------*/

//---------------------------------------------------------------------------
//  Includes
//---------------------------------------------------------------------------

#include <stdlib.h>
#include <stdio.h>

#include <OSGConfig.h>
#include <OSGMaterial.h>
#include <OSGCamera.h>
#include <OSGTileCameraDecorator.h>

#include "OSGPolygonBackground.h"

OSG_USING_NAMESPACE

/***************************************************************************\
 *                            Description                                  *
\***************************************************************************/

/***************************************************************************\
 *                           Class variables                               *
\***************************************************************************/

/***************************************************************************\
 *                           Class methods                                 *
\***************************************************************************/

void PolygonBackground::initMethod (void)
{
}


/***************************************************************************\
 *                           Instance methods                              *
\***************************************************************************/

/*-------------------------------------------------------------------------*\
 -  private                                                                 -
\*-------------------------------------------------------------------------*/

/*----------------------- constructors & destructors ----------------------*/

PolygonBackground::PolygonBackground(void) :
    Inherited()
{
}

PolygonBackground::PolygonBackground(const PolygonBackground &source) :
    Inherited(source)
{
}

PolygonBackground::~PolygonBackground(void)
{
}

/*----------------------------- class specific ----------------------------*/

Real32 PolygonBackground::mapCoordinate(Real32 val, Real32 max, bool norm)
{
    if(val >= 0)
    {
        if (norm)
            val *= max;
    }
    else
    {
        val += 1;
        
        if (norm)
            val *= max;
        
        val = max + val;
    }
   
    return val;
}

void PolygonBackground::clear(DrawActionBase *act, Viewport *port)
{
    if (port->getPixelWidth()  == 0 ||
        port->getPixelHeight() == 0 ) 
    {   
        FWARNING(("PolygonBackground::clear: "
                  "Port has zero size: nothing to render to!\n"));
        return;
    }
        
    if (getPositions().getSize() == 0 ||
        getPositions().getSize() != getTexCoords().getSize())
    {
        FWARNING(("PolygonBackground::clear: positions and texcoords have "
                  "different/ invalid sizes (%d vs. %d)!\n", 
                  getPositions().getSize(), getTexCoords().getSize()));
        return;
    }

    Int32 bit = getClearStencilBit();      // 0x0
    
    if (bit >= 0)
    {
        glClearStencil(bit);
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
    }
    else
    {
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    }

    glPushAttrib(GL_ALL_ATTRIB_BITS);

    glDisable(GL_DEPTH_TEST);
    glDepthFunc(GL_ALWAYS);

    if ( getCleanup() )
        glDepthMask(GL_FALSE);

    Real32 aspectX = 1.0f, aspectY = 1.0f;
    
    if (getAspectHeight() && getAspectWidth())
    {
        aspectX = ((Real32)port->getPixelHeight()/getAspectHeight()) /
                  ((Real32)port->getPixelWidth() / getAspectWidth());
    }
    
    glMatrixMode(GL_TEXTURE);
    glPushMatrix();
    glLoadIdentity();
 
    glMatrixMode(GL_MODELVIEW);
    glPushMatrix();
    glLoadIdentity();

    glMatrixMode(GL_PROJECTION);
    glPushMatrix();
    glLoadIdentity();
    
    Real32 sFac = getScale() > 0 ? getScale() : 1.0f;
    
    UInt32 width  = port->getPixelWidth(),
           height = port->getPixelHeight();
    
    Camera *cP = act->getCamera();
    TileCameraDecorator *cdP = dynamic_cast<TileCameraDecorator*>(cP);
    
    while (cdP != NULL)
    {
        width  = cdP->getFullWidth()  ? cdP->getFullWidth()  : width;
        height = cdP->getFullHeight() ? cdP->getFullHeight() : height;
        
        cP  = cdP->getDecoratee().getCPtr();
        cdP = dynamic_cast<TileCameraDecorator*>(cP);
    }
    
    cP = act->getCamera();
    cdP = dynamic_cast<TileCameraDecorator*>(cP);
    
    if (cdP && !getTile())
    {
        Real32 t = 0,
               left   = cdP->getLeft(),
               right  = cdP->getRight(),
               top    = cdP->getTop(),
               bottom = cdP->getBottom();
        
        if (getAspectHeight() && getAspectWidth() &&
            height != 0 && width != 0)
        {
            aspectX = ((Real32)height/getAspectHeight()) /
                      ((Real32)width / getAspectWidth());
            t  = (Real32)width * (1 - aspectX) * 0.5f;
            t *= (Real32)port->getPixelWidth() / width;
        }
        
        Matrix sm;
        cP->getDecoration(sm, width, height);
        
        glLoadMatrixf(sm.getValues());
        glOrtho(0, port->getPixelWidth(), 0, port->getPixelHeight(), 0, 1);
        
        glTranslatef(t, 0, 0);
        glScalef(aspectX, aspectY, 1);
        
        float t1 = (1 - sFac) * 0.5f * (Real32)port->getPixelWidth();
        float t2 = (1 - sFac) * 0.5f * (Real32)port->getPixelHeight();
        glTranslatef(t1, t2, 0);
        glScalef(sFac,sFac,1);
    }
    else
    {
        glScalef(sFac,sFac,1);
        
        glScalef(aspectX, aspectY, 1);
        glOrtho(0, port->getPixelWidth(), 0, port->getPixelHeight(), 0, 1);    
    }
    
    getMaterial()->getState()->activate(act);
    
    Vec3f *tc  = &getTexCoords()[0];
    Pnt2f *pos = &getPositions()[0];
    
    glBegin(GL_POLYGON);
    
    for (UInt16 i=0; i<getPositions().size(); i++)
    {
        glTexCoord3fv( tc[i].getValues() );
        glVertex2f( mapCoordinate(pos[i][0], Real32(port->getPixelWidth()),
                                             getNormalizedX()),
                    mapCoordinate(pos[i][1], Real32(port->getPixelHeight()),
                                             getNormalizedY()) );
    }

    glEnd();
    
    getMaterial()->getState()->deactivate(act);

    glScalef(1, 1, 1);

    if ( getCleanup() )
    {
        if (bit >= 0)
            glClear(GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
        else
            glClear(GL_DEPTH_BUFFER_BIT);
    }
    
    glMatrixMode(GL_PROJECTION);
    glPopMatrix();
    glMatrixMode(GL_MODELVIEW);
    glPopMatrix();
    glMatrixMode(GL_TEXTURE);
    glPopMatrix();

    glPopAttrib();
}

void PolygonBackground::changed(BitVector whichField, UInt32 origin)
{
    Inherited::changed(whichField, origin);
}

void PolygonBackground::dump(      UInt32    , 
                         const BitVector ) const
{
    SLOG << "Dump PolygonBackground NI" << std::endl;
}


/*------------------------------------------------------------------------*/
/*                              cvs id's                                  */

#ifdef OSG_SGI_CC
#pragma set woff 1174
#endif

#ifdef OSG_LINUX_ICC
#pragma warning( disable : 177 )
#endif

namespace
{
    static Char8 cvsid_cpp       [] = "@(#)$Id: OSGPolygonBackground.cpp,v 1.7 2007/03/09 16:59:50 yjung Exp $";
    static Char8 cvsid_hpp       [] = OSGPOLYGONBACKGROUNDBASE_HEADER_CVSID;
    static Char8 cvsid_inl       [] = OSGPOLYGONBACKGROUNDBASE_INLINE_CVSID;

    static Char8 cvsid_fields_hpp[] = OSGPOLYGONBACKGROUNDFIELDS_HEADER_CVSID;
}

#ifdef __sgi
#pragma reset woff 1174
#endif

---