[692] | 1 | /*
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| 2 | -----------------------------------------------------------------------------
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| 3 | This source file is part of OGRE
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| 4 | (Object-oriented Graphics Rendering Engine)
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| 5 | For the latest info, see http://www.ogre3d.org/
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| 6 |
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| 7 | Copyright (c) 2000-2005 The OGRE Team
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| 8 | Also see acknowledgements in Readme.html
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| 9 |
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| 10 | This program is free software; you can redistribute it and/or modify it under
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| 11 | the terms of the GNU Lesser General Public License as published by the Free Software
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| 12 | Foundation; either version 2 of the License, or (at your option) any later
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| 13 | version.
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| 14 |
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| 15 | This program is distributed in the hope that it will be useful, but WITHOUT
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| 16 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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| 17 | FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
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| 18 |
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| 19 | You should have received a copy of the GNU Lesser General Public License along with
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| 20 | this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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| 21 | Place - Suite 330, Boston, MA 02111-1307, USA, or go to
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| 22 | http://www.gnu.org/copyleft/lesser.txt.
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| 23 | -----------------------------------------------------------------------------
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| 24 | */
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| 25 | #include "OgreColourImageAffector.h"
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| 26 | #include "OgreParticleSystem.h"
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| 27 | #include "OgreStringConverter.h"
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| 28 | #include "OgreParticle.h"
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| 29 | #include "OgreException.h"
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| 30 | #include "OgreResourceGroupManager.h"
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| 31 |
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| 32 | namespace Ogre {
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| 33 |
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| 34 | // init statics
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| 35 | ColourImageAffector::CmdImageAdjust ColourImageAffector::msImageCmd;
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| 36 |
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| 37 | //-----------------------------------------------------------------------
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| 38 | ColourImageAffector::ColourImageAffector(ParticleSystem* psys)
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| 39 | :ParticleAffector(psys), mColourImageLoaded(false)
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| 40 | {
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| 41 | mType = "ColourImage";
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| 42 |
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| 43 | // Init parameters
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| 44 | if (createParamDictionary("ColourImageAffector"))
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| 45 | {
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| 46 | ParamDictionary* dict = getParamDictionary();
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| 47 |
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| 48 | dict->addParameter(ParameterDef("image", "image where the colours come from", PT_STRING), &msImageCmd);
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| 49 | }
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| 50 | }
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| 51 | //-----------------------------------------------------------------------
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| 52 | void ColourImageAffector::_initParticle(Particle* pParticle)
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| 53 | {
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| 54 | if (!mColourImageLoaded)
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| 55 | {
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| 56 | _loadImage();
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| 57 | }
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| 58 |
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| 59 | pParticle->colour = mColourImage.getColourAt(0, 0, 0);
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| 60 |
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| 61 | }
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| 62 | //-----------------------------------------------------------------------
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| 63 | void ColourImageAffector::_affectParticles(ParticleSystem* pSystem, Real timeElapsed)
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| 64 | {
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| 65 | Particle* p;
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| 66 | ParticleIterator pi = pSystem->_getIterator();
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| 67 |
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| 68 | if (!mColourImageLoaded)
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| 69 | {
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| 70 | _loadImage();
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| 71 | }
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| 72 |
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| 73 | int width = mColourImage.getWidth() - 1;
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| 74 |
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| 75 | while (!pi.end())
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| 76 | {
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| 77 | p = pi.getNext();
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| 78 | const Real life_time = p->totalTimeToLive;
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| 79 | Real particle_time = 1.0f - (p->timeToLive / life_time);
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| 80 |
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| 81 | if (particle_time > 1.0f)
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| 82 | particle_time = 1.0f;
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| 83 | if (particle_time < 0.0f)
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| 84 | particle_time = 0.0f;
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| 85 |
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| 86 | const Real float_index = particle_time * width;
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| 87 | const int index = (int)float_index;
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| 88 |
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| 89 | if(index < 0)
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| 90 | {
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| 91 | p->colour = mColourImage.getColourAt(0, 0, 0);
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| 92 | }
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| 93 | else if(index >= width)
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| 94 | {
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| 95 | p->colour = mColourImage.getColourAt(width, 0, 0);
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| 96 | }
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| 97 | else
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| 98 | {
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| 99 | // Linear interpolation
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| 100 | const Real fract = float_index - (Real)index;
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| 101 | const Real to_colour = fract;
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| 102 | const Real from_colour = 1.0f - to_colour;
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| 103 |
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| 104 | ColourValue from=mColourImage.getColourAt(index, 0, 0),
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| 105 | to=mColourImage.getColourAt(index+1, 0, 0);
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| 106 |
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| 107 | p->colour.r = from.r*from_colour + to.r*to_colour;
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| 108 | p->colour.g = from.g*from_colour + to.g*to_colour;
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| 109 | p->colour.b = from.b*from_colour + to.b*to_colour;
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| 110 | p->colour.a = from.a*from_colour + to.a*to_colour;
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| 111 | }
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| 112 | }
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| 113 | }
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| 114 |
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| 115 | //-----------------------------------------------------------------------
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| 116 | void ColourImageAffector::setImageAdjust(String name)
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| 117 | {
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| 118 | mColourImageName = name;
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| 119 | mColourImageLoaded = false;
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| 120 | }
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| 121 | //-----------------------------------------------------------------------
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| 122 | void ColourImageAffector::_loadImage(void)
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| 123 | {
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| 124 | mColourImage.load(mColourImageName, mParent->getResourceGroupName());
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| 125 |
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| 126 | PixelFormat format = mColourImage.getFormat();
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| 127 |
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| 128 | if ( !PixelUtil::isAccessible(format) )
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| 129 | {
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| 130 | OGRE_EXCEPT( Exception::ERR_INVALIDPARAMS, "Error: Image is not accessible (rgba) image.",
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| 131 | "ColourImageAffector::_loadImage" );
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| 132 | }
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| 133 |
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| 134 | mColourImageLoaded = true;
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| 135 | }
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| 136 | //-----------------------------------------------------------------------
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| 137 | String ColourImageAffector::getImageAdjust(void) const
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| 138 | {
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| 139 | return mColourImageName;
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| 140 | }
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| 141 |
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| 142 |
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| 143 | //-----------------------------------------------------------------------
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| 144 | //-----------------------------------------------------------------------
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| 145 | //-----------------------------------------------------------------------
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| 146 | // Command objects
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| 147 | //-----------------------------------------------------------------------
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| 148 | //-----------------------------------------------------------------------
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| 149 | String ColourImageAffector::CmdImageAdjust::doGet(const void* target) const
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| 150 | {
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| 151 | return static_cast<const ColourImageAffector*>(target)->getImageAdjust();
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| 152 | }
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| 153 | void ColourImageAffector::CmdImageAdjust::doSet(void* target, const String& val)
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| 154 | {
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| 155 | static_cast<ColourImageAffector*>(target)->setImageAdjust(val);
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| 156 | }
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| 157 |
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| 158 | }
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| 159 |
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| 160 |
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| 161 |
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