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OgreColourImageAffector.cpp

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00001 /*
00002 -----------------------------------------------------------------------------
00003 This source file is part of OGRE 
00004     (Object-oriented Graphics Rendering Engine)
00005 For the latest info, see http://www.ogre3d.org/
00006 
00007 Copyright © 2000-2002 The OGRE Team
00008 Also see acknowledgements in Readme.html
00009 
00010 This program is free software; you can redistribute it and/or modify it under 
00011 the terms of the GNU Lesser General Public License as published by the Free Software 
00012 Foundation; either version 2 of the License, or (at your option) any later 
00013 version.
00014 
00015 This program is distributed in the hope that it will be useful, but WITHOUT 
00016 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
00017 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
00018 
00019 You should have received a copy of the GNU Lesser General Public License along with 
00020 this program; if not, write to the Free Software Foundation, Inc., 59 Temple 
00021 Place - Suite 330, Boston, MA 02111-1307, USA, or go to 
00022 http://www.gnu.org/copyleft/lesser.txt.
00023 -----------------------------------------------------------------------------
00024 */
00025 #include "OgreColourImageAffector.h"
00026 #include "OgreParticleSystem.h"
00027 #include "OgreStringConverter.h"
00028 #include "OgreParticle.h"
00029 #include "OgreException.h"
00030 
00031 
00032 namespace Ogre {
00033     
00034     // init statics
00035     ColourImageAffector::CmdImageAdjust     ColourImageAffector::msImageCmd;
00036 
00037     //-----------------------------------------------------------------------
00038     ColourImageAffector::ColourImageAffector()
00039     {
00040         mType = "ColourImage";
00041 
00042         // Init parameters
00043         if (createParamDictionary("ColourImageAffector"))
00044         {
00045             ParamDictionary* dict = getParamDictionary();
00046 
00047             dict->addParameter(ParameterDef("image", "image where the colours come from", PT_STRING), &msImageCmd);
00048         }
00049     }
00050     //-----------------------------------------------------------------------
00051     void ColourImageAffector::_initParticle(Particle* pParticle)
00052     {
00053         const uchar*        data            = mColourImage.getData();
00054         const Real          div_255         = 1.0f / 255.f;
00055         
00056         pParticle->mColour.r = data[0] * div_255;
00057         pParticle->mColour.g = data[1] * div_255;
00058         pParticle->mColour.b = data[2] * div_255;
00059         pParticle->mColour.a = data[3] * div_255;
00060     
00061     }
00062     //-----------------------------------------------------------------------
00063     void ColourImageAffector::_affectParticles(ParticleSystem* pSystem, Real timeElapsed)
00064     {
00065         Particle*           p;
00066         ParticleIterator    pi              = pSystem->_getIterator();
00067 
00068         Real                width           = mColourImage.getWidth()  - 1;
00069         Real                height          = mColourImage.getHeight() - 1;
00070         const uchar*        data            = mColourImage.getData();
00071 
00072         while (!pi.end())
00073         {
00074             p = pi.getNext();
00075             const Real      life_time       = p->mTotalTimeToLive;
00076             Real            particle_time   = 1.0f - (p->mTimeToLive / life_time); 
00077 
00078             if (particle_time > 1.0f)
00079                 particle_time = 1.0f;
00080             if (particle_time < 0.0f)
00081                 particle_time = 0.0f;
00082 
00083             const Real      float_index     = particle_time * width;
00084             const int       index           = (int)float_index;
00085             const int       position        = index * 4;
00086             const Real      div_255         = 1.0f / 255.f;
00087                 
00088             if (index <= 0 || index >= width)
00089             {
00090                 p->mColour.r = (data[position + 0] * div_255);
00091                 p->mColour.g = (data[position + 1] * div_255);
00092                 p->mColour.b = (data[position + 2] * div_255);
00093                 p->mColour.a = (data[position + 3] * div_255);
00094             } else
00095             {
00096                 const Real      fract       = float_index - (Real)index;
00097                 const Real      to_color    = fract * div_255;
00098                 const Real      from_color  = (div_255 - to_color);
00099 
00100                 p->mColour.r = (data[position + 0] * from_color) + (data[position + 4] * to_color);
00101                 p->mColour.g = (data[position + 1] * from_color) + (data[position + 5] * to_color);
00102                 p->mColour.b = (data[position + 2] * from_color) + (data[position + 6] * to_color);
00103                 p->mColour.a = (data[position + 3] * from_color) + (data[position + 7] * to_color);
00104             }
00105         }
00106     }
00107     
00108     //-----------------------------------------------------------------------
00109     void ColourImageAffector::setImageAdjust(String name)
00110     {
00111         mColourImageName = name;
00112         mColourImage.load(name);
00113 
00114         PixelFormat format = mColourImage.getFormat();
00115 
00116         if ( format != PF_A8R8G8B8 )
00117         {
00118             Except( Exception::ERR_INVALIDPARAMS, "Error: Image is not a rgba image.",
00119                     "ColourImageAffector::setImageAdjust" );
00120         }
00121     }
00122     //-----------------------------------------------------------------------
00123     String ColourImageAffector::getImageAdjust(void) const
00124     {
00125         return mColourImageName;
00126     }
00127     
00128     
00129     //-----------------------------------------------------------------------
00130     //-----------------------------------------------------------------------
00131     //-----------------------------------------------------------------------
00132     // Command objects
00133     //-----------------------------------------------------------------------
00134     //-----------------------------------------------------------------------
00135     String ColourImageAffector::CmdImageAdjust::doGet(const void* target) const
00136     {
00137         return static_cast<const ColourImageAffector*>(target)->getImageAdjust();
00138     }
00139     void ColourImageAffector::CmdImageAdjust::doSet(void* target, const String& val)
00140     {
00141         static_cast<ColourImageAffector*>(target)->setImageAdjust(val);
00142     }
00143 
00144 }
00145 
00146 
00147 

Copyright © 2002-2003 by The OGRE Team
Last modified Fri May 14 23:21:57 2004