libogre/include/sirikata/ogre/Lights.hpp

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/*  Sirikata
 *  Lights.hpp
 *
 *  Copyright (c) 2010, Ewen Cheslack-Postava
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are
 *  met:
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name of Sirikata nor the names of its contributors may
 *    be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _SIRIKATA_OGRE_LIGHTS_HPP_
#define _SIRIKATA_OGRE_LIGHTS_HPP_

#include <sirikata/mesh/LightInfo.hpp>

#include <sirikata/ogre/OgreHeaders.hpp>
#include <OgreLight.h>

#include <sirikata/ogre/OgreConversions.hpp>

namespace Sirikata {
namespace Graphics {

inline float computeClosestPower(
        const Color &source,
        const Color &target,
        float32 power) {
    //minimize sqrt((source.r*power - target.r)^2 + (source.g*power - target.g) + (source.b*power - target.b));
    if (source.length()) {
        return power * source.dot(target) / source.length();
    } else {
        return 0;
    }
}

inline void updateOgreLight(Ogre::Light* light, const LightInfo& linfo) {
    float32 ambientPower, shadowPower;
    ambientPower = computeClosestPower(linfo.mDiffuseColor, linfo.mAmbientColor, linfo.mPower);
    shadowPower = computeClosestPower(linfo.mSpecularColor, linfo.mShadowColor,  linfo.mPower);
    Ogre::ColourValue diffuse_ambient (
        toOgreRGBA(linfo.mDiffuseColor, ambientPower));
    light->setDiffuseColour(diffuse_ambient);

    Ogre::ColourValue specular_shadow (
        toOgreRGBA(linfo.mSpecularColor, shadowPower));
    light->setSpecularColour(specular_shadow);

    light->setPowerScale(linfo.mPower);
    switch (linfo.mType) {
      case LightInfo::POINT:
        light->setType(Ogre::Light::LT_POINT);
        break;
      case LightInfo::SPOTLIGHT:
        light->setType(Ogre::Light::LT_SPOTLIGHT);
        break;
      case LightInfo::DIRECTIONAL:
        light->setType(Ogre::Light::LT_DIRECTIONAL);
        break;
      default:break;
    }
    if (linfo.mType!=LightInfo::DIRECTIONAL) {
        light->setAttenuation(
            linfo.mLightRange,
            linfo.mConstantFalloff,
            linfo.mLinearFalloff,
            linfo.mQuadraticFalloff);
    }
    if (linfo.mType==LightInfo::SPOTLIGHT) {
        light->setSpotlightRange(
            Ogre::Radian(linfo.mConeInnerRadians),
            Ogre::Radian(linfo.mConeOuterRadians),
            linfo.mConeFalloff);
    }
    light->setCastShadows(linfo.mCastsShadow);
}

inline Ogre::Light* constructOgreLight(Ogre::SceneManager* mgr, const String& name, const LightInfo& linfo) {
    if (!mgr->hasLight(name))
        mgr->createLight(name);

    Ogre::Light* light = mgr->getLight(name);
    updateOgreLight( light, linfo );
    return light;
}

} // namespace Graphics
} // namespace Sirikata

#endif //_SIRIKATA_OGRE_LIGHTS_HPP_