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) 2000-2006 Torus Knot Software Ltd |
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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 | You may alternatively use this source under the terms of a specific version of |
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25 | the OGRE Unrestricted License provided you have obtained such a license from |
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26 | Torus Knot Software Ltd. |
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27 | ----------------------------------------------------------------------------- |
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28 | */ |
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29 | #include "OgreColourImageAffector.h" |
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30 | #include "OgreParticleSystem.h" |
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31 | #include "OgreStringConverter.h" |
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32 | #include "OgreParticle.h" |
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33 | #include "OgreException.h" |
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34 | #include "OgreResourceGroupManager.h" |
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35 | |
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36 | namespace Ogre { |
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37 | |
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38 | // init statics |
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39 | ColourImageAffector::CmdImageAdjust ColourImageAffector::msImageCmd; |
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40 | |
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41 | //----------------------------------------------------------------------- |
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42 | ColourImageAffector::ColourImageAffector(ParticleSystem* psys) |
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43 | :ParticleAffector(psys), mColourImageLoaded(false) |
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44 | { |
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45 | mType = "ColourImage"; |
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46 | |
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47 | // Init parameters |
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48 | if (createParamDictionary("ColourImageAffector")) |
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49 | { |
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50 | ParamDictionary* dict = getParamDictionary(); |
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51 | |
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52 | dict->addParameter(ParameterDef("image", "image where the colours come from", PT_STRING), &msImageCmd); |
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53 | } |
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54 | } |
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55 | //----------------------------------------------------------------------- |
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56 | void ColourImageAffector::_initParticle(Particle* pParticle) |
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57 | { |
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58 | if (!mColourImageLoaded) |
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59 | { |
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60 | _loadImage(); |
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61 | } |
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62 | |
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63 | pParticle->colour = mColourImage.getColourAt(0, 0, 0); |
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64 | |
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65 | } |
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66 | //----------------------------------------------------------------------- |
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67 | void ColourImageAffector::_affectParticles(ParticleSystem* pSystem, Real timeElapsed) |
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68 | { |
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69 | Particle* p; |
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70 | ParticleIterator pi = pSystem->_getIterator(); |
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71 | |
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72 | if (!mColourImageLoaded) |
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73 | { |
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74 | _loadImage(); |
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75 | } |
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76 | |
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77 | int width = mColourImage.getWidth() - 1; |
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78 | |
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79 | while (!pi.end()) |
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80 | { |
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81 | p = pi.getNext(); |
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82 | const Real life_time = p->totalTimeToLive; |
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83 | Real particle_time = 1.0f - (p->timeToLive / life_time); |
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84 | |
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85 | if (particle_time > 1.0f) |
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86 | particle_time = 1.0f; |
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87 | if (particle_time < 0.0f) |
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88 | particle_time = 0.0f; |
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89 | |
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90 | const Real float_index = particle_time * width; |
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91 | const int index = (int)float_index; |
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92 | |
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93 | if(index < 0) |
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94 | { |
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95 | p->colour = mColourImage.getColourAt(0, 0, 0); |
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96 | } |
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97 | else if(index >= width) |
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98 | { |
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99 | p->colour = mColourImage.getColourAt(width, 0, 0); |
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100 | } |
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101 | else |
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102 | { |
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103 | // Linear interpolation |
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104 | const Real fract = float_index - (Real)index; |
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105 | const Real to_colour = fract; |
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106 | const Real from_colour = 1.0f - to_colour; |
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107 | |
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108 | ColourValue from=mColourImage.getColourAt(index, 0, 0), |
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109 | to=mColourImage.getColourAt(index+1, 0, 0); |
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110 | |
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111 | p->colour.r = from.r*from_colour + to.r*to_colour; |
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112 | p->colour.g = from.g*from_colour + to.g*to_colour; |
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113 | p->colour.b = from.b*from_colour + to.b*to_colour; |
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114 | p->colour.a = from.a*from_colour + to.a*to_colour; |
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115 | } |
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116 | } |
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117 | } |
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118 | |
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119 | //----------------------------------------------------------------------- |
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120 | void ColourImageAffector::setImageAdjust(String name) |
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121 | { |
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122 | mColourImageName = name; |
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123 | mColourImageLoaded = false; |
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124 | } |
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125 | //----------------------------------------------------------------------- |
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126 | void ColourImageAffector::_loadImage(void) |
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127 | { |
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128 | mColourImage.load(mColourImageName, mParent->getResourceGroupName()); |
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129 | |
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130 | PixelFormat format = mColourImage.getFormat(); |
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131 | |
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132 | if ( !PixelUtil::isAccessible(format) ) |
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133 | { |
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134 | OGRE_EXCEPT( Exception::ERR_INVALIDPARAMS, "Error: Image is not accessible (rgba) image.", |
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135 | "ColourImageAffector::_loadImage" ); |
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136 | } |
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137 | |
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138 | mColourImageLoaded = true; |
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139 | } |
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140 | //----------------------------------------------------------------------- |
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141 | String ColourImageAffector::getImageAdjust(void) const |
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142 | { |
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143 | return mColourImageName; |
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144 | } |
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145 | |
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146 | |
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147 | //----------------------------------------------------------------------- |
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148 | //----------------------------------------------------------------------- |
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149 | //----------------------------------------------------------------------- |
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150 | // Command objects |
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151 | //----------------------------------------------------------------------- |
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152 | //----------------------------------------------------------------------- |
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153 | String ColourImageAffector::CmdImageAdjust::doGet(const void* target) const |
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154 | { |
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155 | return static_cast<const ColourImageAffector*>(target)->getImageAdjust(); |
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156 | } |
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157 | void ColourImageAffector::CmdImageAdjust::doSet(void* target, const String& val) |
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158 | { |
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159 | static_cast<ColourImageAffector*>(target)->setImageAdjust(val); |
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160 | } |
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161 | |
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162 | } |
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163 | |
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164 | |
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165 | |
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