source: osgVisual/src/sky_Silverlining/skySilverLining_skyDrawable.cpp @ 138

/* -*-c++-*- osgVisual - Copyright (C) 2009-2010 Torben Dannhauer
 *
 * This library is based on OpenSceneGraph, open source and may be redistributed and/or modified under 
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 *
 * osgVisual requires for some proprietary modules a license from the correspondig manufacturer.
 * You have to aquire licenses for all used proprietary modules.
 * 
 * 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
 * OpenSceneGraph Public License for more details.
 * 
 * This file is based on the OSG example of the Silverlining SDK:
 * Copyright (c) 2008 Sundog Software, LLC. All rights reserved worldwide.
*/

#include <skySilverLining_skyDrawable.h>
#include <SilverLining.h>
#include <skySilverLining_AtmosphereReference.h>

#include <GL/gl.h>
#include <GL/glu.h>
#include <assert.h>



using namespace SilverLining;
using namespace osgVisual;

skySilverLining_skyDrawable::skySilverLining_skyDrawable()
        : osg::Drawable()
                , _view(0)
                , _skyboxSize(0)
{
    setDataVariance(osg::Object::DYNAMIC);
    setUseVertexBufferObjects(false);
    setUseDisplayList(false);
        pendingNewCloudLayers.clear();
        newCloudLayersToAdd = false;
}

skySilverLining_skyDrawable::skySilverLining_skyDrawable(osgViewer::Viewer* view,  osg::CoordinateSystemNode* csn_)
        : osg::Drawable()
        , _view(view)
                , _skyboxSize(0)
{
    setDataVariance(osg::Object::DYNAMIC);
    setUseVertexBufferObjects(false);
    setUseDisplayList(false);
        pendingNewCloudLayers.clear();
        newCloudLayersToAdd = false;
        sceneRoot = csn_;
}

void skySilverLining_skyDrawable::setLighting(SilverLining::Atmosphere *atmosphere) const
{
    osg::Light *light = _view->getLight();
    osg::Vec4 ambient, diffuse;
    osg::Vec3 direction;

    if (atmosphere && light)
    {
        float ra, ga, ba, rd, gd, bd, x, y, z;
        atmosphere->GetAmbientColor(&ra, &ga, &ba);
        atmosphere->GetSunOrMoonColor(&rd, &gd, &bd);
        atmosphere->GetSunOrMoonPosition(&x, &y, &z);

        direction = osg::Vec3(x, y, z);
        ambient = osg::Vec4(ra, ga, ba, 1.0);
        diffuse = osg::Vec4(rd, gd, bd, 1.0);

        // xform the light direction into camera coordinates
        osg::Quat view = _view->getCamera()->getViewMatrix().getRotate();
        //direction = view * direction;
        direction.normalize();

        light->setAmbient(ambient);
        light->setDiffuse(diffuse);
        light->setSpecular(osg::Vec4(0,0,0,1));
        light->setPosition(osg::Vec4(direction.x(), direction.y(), direction.z(), 0));
    }
}

void skySilverLining_skyDrawable::setSceneFog(SilverLining::Atmosphere *atmosphere) const
{    
        osg::ref_ptr<osg::Fog> fog = new osg::Fog;
    fog->setMode(osg::Fog::EXP);
        //fog->setUseRadialFog( true );

        //_objectsNode  = erde oder object, das mit nebel bedacht werden soll   
        sceneRoot->getOrCreateStateSet()->setAttributeAndModes(fog.get());

        //float hazeR, hazeG, hazeB;
        //double hazeDepth, hazeDensity;
        //atmosphere->GetHaze(hazeR, hazeG, hazeB, hazeDepth, hazeDensity);

    //hazeDensity = 1.0 / 40000;
        //hazeDensity = 0;
        float hazeDensity = 1.0 / atmosphere->GetConditions()->GetVisibility();

    // Decrease fog density with altitude, to avoid fog effects through the vacuum of space.
    static const double H = 8435.0; // Pressure scale height of Earth's atmosphere
    double isothermalEffect = exp(-(atmosphere->GetConditions()->GetLocation().GetAltitude() / H));     
    if (isothermalEffect <= 0) isothermalEffect = 1E-9;
    if (isothermalEffect > 1.0) isothermalEffect = 1.0;
    hazeDensity *= isothermalEffect;

    bool silverLiningHandledTheFog = false;

    if (atmosphere->GetFogEnabled())
    {
            float density, r, g, b;
            // Note, the fog color returned is already lit
            atmosphere->GetFogSettings(&density, &r, &g, &b);

            if (density > hazeDensity)
            {
                                fog->setDensity(density);
                                fog->setColor(osg::Vec4(r, g, b, 1.0));

                                silverLiningHandledTheFog = true;
            }
    }
    
    if (!silverLiningHandledTheFog)
    {
                float r, g, b;
                atmosphere->GetHorizonColor(0, &r, &g, &b);// New version of this call: since SL_1.94 /** \todo transmit the yaw value of the center channel to all slaves for consistent fog color. */

                fog->setDensity(hazeDensity);
                fog->setColor(osg::Vec4(r, g, b, 1.0));
    }

}

void skySilverLining_skyDrawable::initializeSilverLining(skySilverLining_atmosphereReference *ar)
{
    if (ar && !ar->atmosphereInitialized)
    {
        ar->atmosphereInitialized = true; // only try once.
                SilverLining::Atmosphere *atmosphere = ar->atmosphere;

                if (atmosphere)
        {

                        srand(1234); // constant random seed to ensure consistent clouds across windows

            // Update the path below to where you installed SilverLining's resources folder.
            //int ret = atmosphere->Initialize(SilverLining::Atmosphere::OPENGL, "C:\\Program Files\\SilverLining SDK\\resources\\", true, 0);
                        int ret = atmosphere->Initialize(SilverLining::Atmosphere::OPENGL, "../resources/sky_silverlining/", true, 0);
            if (ret != SilverLining::Atmosphere::E_NOERROR)
            {
                printf("SilverLining failed to initialize; error code %d.\n", ret);
                printf("Check that the path to the SilverLining installation directory is set properly ");
                printf("in skySilverLining_skyDrawable.cpp (in SkyDrawable::initializeSilverLining)\n");
                exit(0);
            }

            // Let SilverLining know which way is up. OSG usually has Z going up.
            //atmosphere->SetUpVector(0, 0, 1);
            //atmosphere->SetRightVector(1, 0, 0);
                        atmosphere->SetUpVector(0.662994, 0.136169, 0.736136);
                        atmosphere->SetRightVector(-0.201185, 0.979553, 0.0);

                        /** \todo  :not working!! what is wrong? */
                        // override the some options of the configuration file with the required settings to make silverlining upgrades easier
                        OSG_ALWAYS << "atmosphere from space before : " << atmosphere->GetConfigOptionBoolean("enable-atmosphere-from-space") << std::endl;
                        atmosphere->SetConfigOption("enable-atmosphere-from-space", "yes");
                        atmosphere->SetConfigOption("draw-sun-below-horizon", "yes");
                        OSG_ALWAYS << "atmosphere from space after: " << atmosphere->GetConfigOptionBoolean("enable-atmosphere-from-space") << std::endl;

            // Set our location (change this to your own latitude and longitude)
            SilverLining::Location loc;
            loc.SetAltitude(0);
            loc.SetLatitude(47);
            loc.SetLongitude(11);
            atmosphere->GetConditions()->SetLocation(loc);

            // Set the system time in PST
            SilverLining::LocalTime t;
            t.SetFromSystemTime();
                        t.SetTimeZone(CET);
            atmosphere->GetConditions()->SetTime(t);

                        // Setting Up Visibility
                        atmosphere->GetConditions()->SetVisibility(40000);

                        // Setting Up Haze
                        atmosphere->GetConditions()->SetTurbidity(2.2);

                        // Setting up time passage
                        atmosphere->GetConditions()->EnableTimePassage( true, 5000 );
                        
                }       // if atmosphere ENDE

    }   // If atmosphere not initialized ENDE
}

void skySilverLining_skyDrawable::drawImplementation(osg::RenderInfo& renderInfo) const
{
        skySilverLining_atmosphereReference *ar = dynamic_cast<skySilverLining_atmosphereReference *>(renderInfo.getCurrentCamera()->getUserData());
        SilverLining::Atmosphere *atmosphere = 0;

        if (ar) atmosphere = ar->atmosphere;

        renderInfo.getState()->disableAllVertexArrays();

    if (atmosphere)
    {
        initializeSilverLining(ar);
                const_cast<skySilverLining_skyDrawable*>(this)->seedAndAddCloudLayers(atmosphere);


        atmosphere->BeginFrame(true, true, _skyboxSize);
        setLighting(atmosphere);
                setSceneFog(atmosphere);
    }

        renderInfo.getState()->dirtyAllVertexArrays();
}

void skySilverLining_skyDrawable::addCloudLayerOrder(cloudlayerOrder newCL)
{
        OpenThreads::ScopedLock<OpenThreads::Mutex> sLock(cloudLayersToAddMutex); 
        pendingNewCloudLayers.push_back( newCL );
        newCloudLayersToAdd = true;
}

void skySilverLining_skyDrawable::seedAndAddCloudLayers(SilverLining::Atmosphere *atmosphere)
{
        // Only try to add if anything to do..
        if ( newCloudLayersToAdd )
        {
                OpenThreads::ScopedLock<OpenThreads::Mutex> sLock(cloudLayersToAddMutex); 

                for ( unsigned int i=0; i<pendingNewCloudLayers.size(); i++)    // Configure & Seed cloudLayer
                {
                        // Calculation earth radius on specified lat lon position
                        double radius;
                        cloudlayerOrder newCL = pendingNewCloudLayers[i];
                        if ( !util::calculateEarthRadiusAtWGS84Coordinate(newCL.lat, newCL.lon, sceneRoot, radius) )
                        {
                                OSG_ALWAYS << "ERROR: skySilverLining_skyDrawable::seedAndAddCloudLayers() - Unable to deterine earth radius for lat=" <<newCL.lat<< " lon="<<newCL.lat<<std::endl;
                                return;
                        }
                        OSG_NOTIFY(osg::ALWAYS) << "lat:" << newCL.lat << std::endl;
                        OSG_NOTIFY(osg::ALWAYS) << "lon:" << newCL.lon << std::endl;
                        OSG_NOTIFY(osg::ALWAYS) << "radius:" << radius << std::endl;

                        // generate Cloud Layer
                        SilverLining::CloudLayer *cloudLayer_;
                        cloudLayer_ = SilverLining::CloudLayerFactory::Create(newCL.cloudtype);
                        cloudLayer_->SetBaseAltitude( newCL.baseHeight + radius);
                        cloudLayer_->SetThickness(newCL.thickness);
                        cloudLayer_->SetBaseLength(newCL.baseLength);
                        cloudLayer_->SetBaseWidth(newCL.baseWidth);
                        cloudLayer_->SetDensity(newCL.density);
                        cloudLayer_->SetLayerPosition( 0.0, 0.0 );
                        cloudLayer_->GenerateShadowMaps(false);

                        //Save cloudlayer information into SLOT
                        newCL.assocCloudLayerSlot->used = true;
                        newCL.assocCloudLayerSlot->enabled = true;
                        newCL.assocCloudLayerSlot->cloudLayerPointer = cloudLayer_;
                        switch(newCL.cloudtype)
                        {
                        case 0: newCL.assocCloudLayerSlot->typeName = "CIRROCUMULUS";                           // High planar cloud puffs              
                                break;
                        case 1: newCL.assocCloudLayerSlot->typeName = "CIRRUS_FIBRATUS";                        // High, thicker and fibrous clouds that signal changing weather
                                break;
                        case 2: newCL.assocCloudLayerSlot->typeName = "STRATUS";                                        // Low clouds represented as a slab
                                break;
                        case 3: newCL.assocCloudLayerSlot->typeName = "CUMULUS_MEDIOCRIS";          // Low, puffy clouds on fair days
                                break;
                        case 4: newCL.assocCloudLayerSlot->typeName = "CUMULUS_CONGESTUS";          // Large cumulus clouds that could turn into a thunderhead
                                break;
                        case 5: newCL.assocCloudLayerSlot->typeName = "CUMULONIMBUS_CAPPILATUS";    // Big storm clouds.
                                break;
                        case 6: newCL.assocCloudLayerSlot->typeName = "STRATOCUMULUS";                          // Low, dense, puffy clouds with some sun breaks between them.
                                break;
                        default: OSG_NOTIFY( osg::FATAL ) << "skySilverLining_skyDrawable::seedAndAddCloudLayers() - Invalid cloud type." << std::cout;
                                 break;
                        };

                        // Seed Cloudlayer
                        cloudLayer_->SeedClouds(*atmosphere);
        
                        // Add cloudLayer to atmosphere
                        newCL.assocCloudLayerSlot->cloudLayerHandle = atmosphere->GetConditions()->AddCloudLayer( cloudLayer_ );
                }

                //Clear the ToDo List
                pendingNewCloudLayers.clear();

                // Note nothing to do.
                newCloudLayersToAdd = false;
        }
}

void skySilverLining_skyDrawable::shutdown()
{
        sceneRoot = NULL;
}