main/src/Sun.cpp

/*
This file is part of Caelum.
See http://www.ogre3d.org/wiki/index.php/Caelum 

Copyright (c) 2006-2007 Caelum team. See Contributors.txt for details.

Caelum 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 3 of the License, or
(at your option) any later version.

Caelum 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 Caelum. If not, see <http://www.gnu.org/licenses/>.
*/

#include "CaelumPrecompiled.h"
#include "Sun.h"
#include "SkyLight.h"

namespace caelum {

//========================================================================================================================
// Sphere Sun - deprecated, use Sprite Sun instead
//========================================================================================================================

const Ogre::String SphereSun::SUN_MATERIAL_NAME = "CaelumSphereSun";

SphereSun::SphereSun (Ogre::SceneManager *sceneMgr, Ogre::SceneNode *caelumRootNode, const Ogre::String &meshName) : BaseSkyLight(sceneMgr, caelumRootNode) {
    mSunMaterial = Ogre::MaterialManager::getSingletonPtr()->getByName(SUN_MATERIAL_NAME);
    mSunMaterial = mSunMaterial->clone(SUN_MATERIAL_NAME + Ogre::StringConverter::toString((size_t)this));
    mSunMaterial->load();
    mSunEntity = sceneMgr->createEntity ("CaelumSun", meshName);
    mSunEntity->setMaterialName (mSunMaterial->getName());
    mSunEntity->setCastShadows (false);
    mSunEntity->setRenderQueueGroup (CAELUM_RENDER_QUEUE_SUN);
    mNode->attachObject (mSunEntity);
}

SphereSun::~SphereSun () {
    if (mNode) {
        mNode->detachObject (mSunEntity);
    }
    if (mSunEntity) {
        mSunEntity->_getManager ()->destroyEntity (mSunEntity);
        mSunEntity = 0;
    }
    Ogre::MaterialManager::getSingletonPtr()->remove(mSunMaterial->getHandle());
}

void SphereSun::setBodyColour (const Ogre::ColourValue &colour) {
    BaseSkyLight::setBodyColour(colour);

    // Set sun material colour.
    mSunMaterial->setSelfIllumination (colour);
}

void SphereSun::notifyCameraChanged (Ogre::Camera *cam) {
    // This calls setFarRadius
    CameraBoundElement::notifyCameraChanged(cam);

    // Set sun position.
    Ogre::Real sunDistance = mRadius - mRadius * Ogre::Math::Tan (Ogre::Degree (0.01));
    mNode->setPosition(-mDirection * sunDistance);

    // Set sun scaling  in [1.6(6) ~ 2.0] range.
    float factor = 2 - mBodyColour.b / 3;
    float scale = factor * sunDistance * Ogre::Math::Tan (Ogre::Degree (0.01));
    mNode->setScale (Ogre::Vector3::UNIT_SCALE * scale);
}

//========================================================================================================================
// Sprite Sun
//========================================================================================================================

const Ogre::String SpriteSun::SUN_MATERIAL_NAME = "CaelumSpriteSun";

SpriteSun::SpriteSun (  Ogre::SceneManager *sceneMgr,
                        Ogre::SceneNode *caelumRootNode, 
                        const Ogre::String &sunTextureName,
                        const Ogre::Degree& sunTextureAngularSize) 
    : BaseSkyLight(sceneMgr, caelumRootNode)
    , mSunTextureAngularSize(sunTextureAngularSize)
{
    mSunMaterial = Ogre::MaterialManager::getSingletonPtr()->getByName(SUN_MATERIAL_NAME);
    mSunMaterial = mSunMaterial->clone(SUN_MATERIAL_NAME + Ogre::StringConverter::toString((size_t)this));
    mSunMaterial->load();
    assert(!mSunMaterial.isNull());
    setSunTexture(sunTextureName);

    mSunBillboardSet = sceneMgr->createBillboardSet("CaelumSpriteSun", 2);
    mSunBillboardSet->setMaterialName (mSunMaterial->getName());
    mSunBillboardSet->setCastShadows (false);
    mSunBillboardSet->setRenderQueueGroup (CAELUM_RENDER_QUEUE_SUN);
    mSunBillboardSet->setDefaultDimensions(1.0f, 1.0f);
    mSunBillboardSet->createBillboard(Ogre::Vector3::ZERO);

    mNode->attachObject (mSunBillboardSet);
}

SpriteSun::~SpriteSun () {
    if (mNode) {
        mNode->detachObject (mSunBillboardSet);
    }
    if (mSunBillboardSet) {
        mSunBillboardSet->_getManager ()->destroyBillboardSet (mSunBillboardSet);
        mSunBillboardSet = 0;
    }
    Ogre::MaterialManager::getSingletonPtr()->remove(mSunMaterial->getHandle());
}

void SpriteSun::setBodyColour (const Ogre::ColourValue &colour) {
    BaseSkyLight::setBodyColour(colour);

    // Set sun material colour.
    mSunBillboardSet->getBillboard(0)->setColour(colour);
}

void SpriteSun::setSunTexture (const Ogre::String &textureName) {
    // Update the sun material
    assert(mSunMaterial->getBestTechnique ());
    assert(mSunMaterial->getBestTechnique ()->getPass (0));
    assert(mSunMaterial->getBestTechnique ()->getPass (0)->getTextureUnitState (0));
    mSunMaterial->getBestTechnique ()->getPass (0)->getTextureUnitState (0)->setTextureName (textureName);
}

void SpriteSun::setSunTextureAngularSize(const Ogre::Degree& sunTextureAngularSize){
    mSunTextureAngularSize = sunTextureAngularSize;
}

void SpriteSun::notifyCameraChanged (Ogre::Camera *cam) {
    // This calls setFarRadius
    BaseSkyLight::notifyCameraChanged(cam);

    // Set sun position.
    Ogre::Real sunDistance = mRadius - mRadius * Ogre::Math::Tan(mSunTextureAngularSize);
    mNode->setPosition(-mDirection * sunDistance);

    // Set sun scaling in [1.0 ~ 1.2] range
    float factor = 1.2f - mBodyColour.b * 0.2f;
    float scale = factor * sunDistance * Ogre::Math::Tan(mSunTextureAngularSize);
    mNode->setScale (Ogre::Vector3::UNIT_SCALE * scale);
}

} // namespace caelum

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