src/skyBox.cpp

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/***************************************************************************
 *   Copyright (C) 2007 by                                                 *
 *         Pierre-yves JEZEQUEL, Julien MICHOT, Loic MOISAN,               *
 *         Julien PAPILLON, Sebastien PINEAUD, Barthelemy SERRES           *
 *                                                                         *
 *   https://sourceforge.net/projects/anidam                               *
 *                                                                         *
 *   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 <string>
#include <stdio.h>
#include "skyBox.h"

SkyBox::SkyBox()
    {
        //SkyBox::readCubeMap();
    }
SkyBox::~SkyBox()
    {
    
    }


osg::TextureCubeMap* SkyBox::readCubeMap()
{
    osg::TextureCubeMap* cubemap = new osg::TextureCubeMap;
    //#define CUBEMAP_FILENAME(face) "nvlobby_" #face ".png"
    //#define CUBEMAP_FILENAME(face) "Cubemap_axis/" #face ".png"
    #define CUBEMAP_FILENAME(face) "Cubemap/" #face ".jpg"
    try{
    osg::Image* imagePosX = osgDB::readImageFile(CUBEMAP_FILENAME(posx));
    osg::Image* imageNegX = osgDB::readImageFile(CUBEMAP_FILENAME(negx));
    osg::Image* imagePosY = osgDB::readImageFile(CUBEMAP_FILENAME(posy));
    osg::Image* imageNegY = osgDB::readImageFile(CUBEMAP_FILENAME(negy));
    osg::Image* imagePosZ = osgDB::readImageFile(CUBEMAP_FILENAME(posz));
    osg::Image* imageNegZ = osgDB::readImageFile(CUBEMAP_FILENAME(negz));

    if (imagePosX && imageNegX && imagePosY && imageNegY && imagePosZ && imageNegZ)
    {
        cubemap->setImage(osg::TextureCubeMap::POSITIVE_X, imagePosX);
        cubemap->setImage(osg::TextureCubeMap::NEGATIVE_X, imageNegX);
        cubemap->setImage(osg::TextureCubeMap::POSITIVE_Y, imagePosY);
        cubemap->setImage(osg::TextureCubeMap::NEGATIVE_Y, imageNegY);
        cubemap->setImage(osg::TextureCubeMap::POSITIVE_Z, imagePosZ);
        cubemap->setImage(osg::TextureCubeMap::NEGATIVE_Z, imageNegZ);
        
        cubemap->setWrap(osg::Texture::WRAP_S, osg::Texture::CLAMP_TO_EDGE);
        cubemap->setWrap(osg::Texture::WRAP_T, osg::Texture::CLAMP_TO_EDGE);
        cubemap->setWrap(osg::Texture::WRAP_R, osg::Texture::CLAMP_TO_EDGE);

        cubemap->setFilter(osg::Texture::MIN_FILTER, osg::Texture::LINEAR_MIPMAP_LINEAR);
        cubemap->setFilter(osg::Texture::MAG_FILTER, osg::Texture::LINEAR);
    }
    //std::cout << "CubeMap ok." << std::endl;
        printf("Cube map ok\n");
        }
catch(std::exception & e)
        {
            printf("%s",e.what());//std::cout << "Erreur cubeMap.(" << e.what() << ")" << std::endl; 
        }
    return cubemap;
}


// Update texture matrix for cubemaps
struct TexMatCallback : public osg::NodeCallback
{
public:

    TexMatCallback(osg::TexMat& tm) :
        _texMat(tm)
    {
    }

    virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
    {
        osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(nv);
        if (cv)
        {
            const osg::Matrix& MV = cv->getModelViewMatrix();
            const osg::Matrix R = osg::Matrix::rotate( osg::DegreesToRadians(112.0f), 0.0f,0.0f,1.0f)*
                                  osg::Matrix::rotate( osg::DegreesToRadians(90.0f), 1.0f,0.0f,0.0f);

            osg::Quat q = MV.getRotate();
            const osg::Matrix C = osg::Matrix::rotate( q.inverse() );

            _texMat.setMatrix( C*R );
        }

        traverse(node,nv);
    }

    osg::TexMat& _texMat;
};


class MoveEarthySkyWithEyePointTransform : public osg::Transform
{
public:
    virtual bool computeLocalToWorldMatrix(osg::Matrix& matrix,osg::NodeVisitor* nv) const 
    {
        osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(nv);
        if (cv)
        {
            osg::Vec3 eyePointLocal = cv->getEyeLocal();
            matrix.preMult(osg::Matrix::translate(eyePointLocal));
        }
        return true;
    }

    virtual bool computeWorldToLocalMatrix(osg::Matrix& matrix,osg::NodeVisitor* nv) const
    {
        osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(nv);
        if (cv)
        {
            osg::Vec3 eyePointLocal = cv->getEyeLocal();
            matrix.postMult(osg::Matrix::translate(-eyePointLocal));
        }
        return true;
    }
};


osg::Node* SkyBox::createSkyBox()
{

    osg::StateSet* stateset = new osg::StateSet();

    osg::TexEnv* te = new osg::TexEnv;
    te->setMode(osg::TexEnv::REPLACE);
    stateset->setTextureAttributeAndModes(0, te, osg::StateAttribute::ON);

    osg::TexGen *tg = new osg::TexGen;
    tg->setMode(osg::TexGen::NORMAL_MAP);
    stateset->setTextureAttributeAndModes(0, tg, osg::StateAttribute::ON);

    osg::TexMat *tm = new osg::TexMat;
    stateset->setTextureAttribute(0, tm);

    osg::TextureCubeMap* skymap = readCubeMap();
    stateset->setTextureAttributeAndModes(0, skymap, osg::StateAttribute::ON);

    stateset->setMode( GL_LIGHTING, osg::StateAttribute::OFF );
    stateset->setMode( GL_CULL_FACE, osg::StateAttribute::OFF );

    // clear the depth to the far plane.
    osg::Depth* depth = new osg::Depth;
    depth->setFunction(osg::Depth::ALWAYS);
    depth->setRange(1.0,1.0);   
    stateset->setAttributeAndModes(depth, osg::StateAttribute::ON );

    stateset->setRenderBinDetails(6,"RenderBin");

    osg::Drawable* drawable = new osg::ShapeDrawable(new osg::Sphere(osg::Vec3(0.0f,0.0f,0.0f),100));

    osg::Geode* geode = new osg::Geode;
    geode->setCullingActive(false);
    geode->setStateSet( stateset );
    geode->addDrawable(drawable);


    osg::Transform* transform = new MoveEarthySkyWithEyePointTransform;
    transform->setCullingActive(false);
    transform->addChild(geode);

    osg::ClearNode* clearNode = new osg::ClearNode;
//  clearNode->setRequiresClear(false);
    clearNode->setCullCallback(new TexMatCallback(*tm));
    clearNode->addChild(transform);

    return clearNode;
}

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