MoonManager.cpp

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/*
--------------------------------------------------------------------------------
This source file is part of SkyX.
Visit http://www.paradise-studios.net/products/skyx/
 
Copyright (C) 2009-2012 Xavier Verguín González <xavyiy@gmail.com>
 
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser 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 Lesser General Public License for more details.
 
You should have received a copy of the GNU Lesser 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, or go to
http://www.gnu.org/copyleft/lesser.txt.
--------------------------------------------------------------------------------
*/
 
#include "MoonManager.h"
 
#include "SkyX.h"
 
namespace SkyX
{
    MoonManager::MoonManager(SkyX *s)
        : mSkyX(s)
        , mMoonBillboard(0)
        , mMoonSceneNode(0)
        , mCreated(false)
        , mMoonSize(0.225f)
        , mMoonHaloIntensity(0.4f)
        , mMoonHaloStrength(0.9f)
        , mMoonMaterial(Ogre::MaterialPtr())
    {
    }
 
    MoonManager::~MoonManager()
    {
        remove();
    }
 
    void MoonManager::create()
    {
        if (mCreated)
        {
            return;
        }
 
        mMoonMaterial = static_cast<Ogre::MaterialPtr>(Ogre::MaterialManager::getSingleton().getByName("SkyX_Moon"));
 
        if (mMoonMaterial.isNull())
        {
            SkyXLOG("Error while creating SkyX::MoonManager, material not found");
            return;
        }
 
        mMoonSceneNode = mSkyX->getSceneManager()->getRootSceneNode()->createChildSceneNode();
 
        mMoonBillboard = mSkyX->getSceneManager()->createBillboardSet("SkyXMoonBillboardSet", 1);
        mMoonBillboard->setMaterialName(mSkyX->getGPUManager()->getMoonMaterialName());
        mMoonBillboard->setBillboardType(Ogre::BBT_ORIENTED_COMMON);
        mMoonBillboard->setRenderQueueGroup(mSkyX->getRenderQueueGroups().skydome+1);
        mMoonBillboard->setCastShadows(false);
 
        mMoonBillboard->createBillboard(Ogre::Vector3(0,0,0));
 
        mMoonSceneNode->attachObject(mMoonBillboard);
 
        mCreated = true;
    }
 
    void MoonManager::remove()
    {
        if (!mCreated)
        {
            return;
        }
 
        mMoonSceneNode->detachAllObjects();
        mMoonSceneNode->getParentSceneNode()->removeAndDestroyChild(mMoonSceneNode);
        mMoonSceneNode = 0;
 
        mSkyX->getSceneManager()->destroyBillboardSet(mMoonBillboard);
        mMoonBillboard = 0;
 
        mMoonMaterial.setNull();
 
        mCreated = false;
    }
 
    void MoonManager::updateMoonPhase(const Ogre::Real& phase)
    {
        Ogre::Real center = 0, radius = 0, radius_add = 0, interpolation = 0, halo_flip = 0;
 
        Ogre::Vector3 halo1, halo2;
 
        // [-1, 0]
        if (phase < 0)
        {
            // [-1, -0.5]
            if (phase < -0.5)
            {
                center = (1+phase)/2;
                radius = 0.25;
 
                interpolation = center*4;
 
                if (interpolation < 1.0f/3)
                {
                    interpolation /= 1.0f/3;
                    halo1 = Ogre::Vector3(0.25, 0.5, (1-interpolation)*interpolation);
                    halo2 = Ogre::Vector3(0.25, 0.5, interpolation);
                }
                else if (interpolation < 2.0f/3)
                {
                    interpolation -= 1.0f/3;
                    interpolation /= 1.0f/3;
                    halo1 = Ogre::Vector3(0.25, 0.5, 1-interpolation);
                    halo2 = Ogre::Vector3(0.0, 0.5, interpolation);
                }
                else
                {
                    interpolation -= 2.0f/3;
                    interpolation /= 1.0f/3;
                    halo1 = Ogre::Vector3(0.0, 0.5, 1-interpolation);
                    halo2 = Ogre::Vector3(0.75, 0.0, interpolation);
                }
 
                radius_add =  0.1*center/(0.25001-center);
 
                radius += radius_add;
                center += radius_add;
            }
            // [-0.5, 0]
            else
            {
                center = (-phase)/2;
                radius = 0.25;
 
                interpolation = 1-center*4;
 
                if (interpolation < 1.0f/3)
                {
                    interpolation /= 1.0f/3;
                    halo1 = Ogre::Vector3(0.75, 0.0, 1-interpolation);
                    halo2 = Ogre::Vector3(0.5, 0.0, interpolation);
                }
                else if (interpolation < 2.0f/3)
                {
                    interpolation -= 1.0f/3;
                    interpolation /= 1.0f/3;
                    halo1 = Ogre::Vector3(0.5, 0.0, 1-interpolation);
                    halo2 = Ogre::Vector3(0.25, 0.0, interpolation);
                }
                else
                {
                    interpolation -= 2.0f/3;
                    interpolation /= 1.0f/3;
                    halo1 = Ogre::Vector3(0.25, 0.0, 1-interpolation);
                    halo2 = Ogre::Vector3(0.00, 0.0, interpolation);
                }
 
                radius_add =  0.1*center/(0.25001-center);
 
                radius += radius_add;
                center += radius_add;
 
                radius = -radius;
                center = -center;
            }
        }
        // [0, 1]
        else
        {
            halo_flip = 1;
 
            // [0, 0.5]
            if (phase < 0.5)
            {
                center = phase/2;
                radius = 0.25;
 
                interpolation = center*4;
 
                if (interpolation < 1.0f/3)
                {
                    interpolation /= 1.0f/3;
                    halo1 = Ogre::Vector3(0.00, 0.0, 1-interpolation);
                    halo2 = Ogre::Vector3(0.25, 0.0, interpolation);
                }
                else if (interpolation < 2.0f/3)
                {
                    interpolation -= 1.0f/3;
                    interpolation /= 1.0f/3;
                    halo1 = Ogre::Vector3(0.25, 0.0, 1-interpolation);
                    halo2 = Ogre::Vector3(0.5, 0.0, interpolation);
                }
                else
                {
                    interpolation -= 2.0f/3;
                    interpolation /= 1.0f/3;
                    halo1 = Ogre::Vector3(0.5, 0.0, 1-interpolation);
                    halo2 = Ogre::Vector3(0.75, 0.0, interpolation);
                }
 
                radius_add =  0.1*center/(0.25001-center);
 
                radius += radius_add;
                center += radius_add;
 
                radius = -radius;
                center = center;
            }
            // [0.5, 1]
            else
            {
                center = (1-phase)/2;
                radius = 0.25;
 
                interpolation = 1-center*4;
 
                if (interpolation < 1.0f/3)
                {
                    interpolation /= 1.0f/3;
                    halo1 = Ogre::Vector3(0.75, 0.0, 1-interpolation);
                    halo2 = Ogre::Vector3(0.0, 0.5, interpolation);
                }
                else if (interpolation < 2.0f/3)
                {
                    interpolation -= 1.0f/3;
                    interpolation /= 1.0f/3;
                    halo1 = Ogre::Vector3(0.0, 0.5, 1-interpolation);
                    halo2 = Ogre::Vector3(0.25, 0.5, interpolation);
                }
                else
                {
                    interpolation -= 2.0f/3;
                    interpolation /= 1.0f/3;
                    halo1 = Ogre::Vector3(0.25, 0.5, 1-interpolation);
                    halo2 = Ogre::Vector3(0.25, 0.5, (1-interpolation)*interpolation);
                }
 
                radius_add =  0.1*center/(0.25001-center);
 
                radius += radius_add;
                center += radius_add;
 
                center = -center;
            }
        }
 
        mMoonMaterial->getTechnique(0)->getPass(0)->getFragmentProgramParameters()->setNamedConstant("uMoonPhase", Ogre::Vector3(radius, center + 0.5f, mMoonHaloStrength));
 
        halo1.z *= mMoonHaloIntensity;
        halo2.z *= mMoonHaloIntensity;
 
        mMoonMaterial->getTechnique(0)->getPass(0)->getFragmentProgramParameters()->setNamedConstant("uMoonHalo1", halo1);
        mMoonMaterial->getTechnique(0)->getPass(0)->getFragmentProgramParameters()->setNamedConstant("uMoonHalo2", halo2);
        mMoonMaterial->getTechnique(0)->getPass(0)->getFragmentProgramParameters()->setNamedConstant("uMoonHaloFlip", halo_flip);
    }
 
    void MoonManager::updateGeometry(Ogre::Camera* c)
    {
        if (!mCreated)
        {
            return;
        }
 
        float radius = mSkyX->getMeshManager()->getSkydomeRadius(c)*0.95f,
              size = radius*mMoonSize;
 
        mMoonBillboard->setCommonDirection((mSkyX->getController()->getMoonDirection()).normalisedCopy().perpendicular());
 
        Ogre::Vector3 moonRelativePos = mSkyX->getController()->getMoonDirection()*
            Ogre::Math::Cos(Ogre::Math::ASin((size/2)/radius))*radius;
 
        mMoonSceneNode->setPosition(c->getDerivedPosition() + moonRelativePos);
 
        if (moonRelativePos.y < -size/2)
        {
            mMoonSceneNode->setVisible(false);
        }
        else
        {
            mMoonSceneNode->setVisible(mSkyX->isVisible());
 
            mMoonMaterial->getTechnique(0)->getPass(0)
                ->getVertexProgramParameters()->setNamedConstant("uSkydomeCenter", c->getDerivedPosition());
        }
 
        if (mMoonBillboard->getBoundingBox().getMaximum().x != size)
        {
            _updateMoonBounds(c);
        }
    }
 
    void MoonManager::_updateMoonBounds(Ogre::Camera* c)
    {
        float radius = mSkyX->getMeshManager()->getSkydomeRadius(c)*0.95f,
              size = radius*mMoonSize;
 
        mMoonBillboard->setDefaultDimensions(size, size);
        mMoonBillboard->setBounds(Ogre::AxisAlignedBox(-size/2, -size/2, -size/2,
                                                        size/2,  size/2,  size/2), 1);
        mMoonSceneNode->_updateBounds();
    }
}