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 "OgreStableHeaders.h"
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26 | #include "OgreRibbonTrail.h"
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27 | #include "OgreMath.h"
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28 | #include "OgreException.h"
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29 | #include "OgreSceneNode.h"
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30 | #include "OgreStringConverter.h"
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31 |
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32 | namespace Ogre
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33 | {
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34 | /** Predefined controller value for getting / setting the frame time
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35 | */
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36 | class _OgreExport TimeControllerValue : public ControllerValue<Real>
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37 | {
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38 | protected:
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39 | RibbonTrail* mTrail;
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40 | public:
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41 | TimeControllerValue(RibbonTrail* r) { mTrail = r; }
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42 |
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43 | Real getValue(void) const { return 0; }// not a source
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44 | void setValue(Real value) { mTrail->_timeUpdate(value); }
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45 |
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46 | };
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47 | //-----------------------------------------------------------------------
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48 | //-----------------------------------------------------------------------
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49 | RibbonTrail::RibbonTrail(const String& name, size_t maxElements,
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50 | size_t numberOfChains, bool useTextureCoords, bool useColours)
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51 | :BillboardChain(name, maxElements, 0, useTextureCoords, useColours, true),
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52 | mFadeController(0)
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53 | {
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54 | setTrailLength(100);
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55 | setNumberOfChains(numberOfChains);
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56 | mTimeControllerValue = ControllerValueRealPtr(new TimeControllerValue(this));
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57 |
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58 | // use V as varying texture coord, so we can use 1D textures to 'smear'
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59 | setTextureCoordDirection(TCD_V);
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60 |
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61 |
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62 | }
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63 | //-----------------------------------------------------------------------
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64 | RibbonTrail::~RibbonTrail()
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65 | {
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66 | // Detach listeners
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67 | for (NodeList::iterator i = mNodeList.begin(); i != mNodeList.end(); ++i)
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68 | {
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69 | (*i)->setListener(0);
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70 | }
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71 |
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72 | if (mFadeController)
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73 | {
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74 | // destroy controller
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75 | ControllerManager::getSingleton().destroyController(mFadeController);
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76 | }
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77 |
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78 | }
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79 | //-----------------------------------------------------------------------
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80 | void RibbonTrail::addNode(Node* n)
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81 | {
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82 | if (mNodeList.size() == mChainCount)
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83 | {
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84 | OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
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85 | mName + " cannot monitor any more nodes, chain count exceeded",
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86 | "RibbonTrail::addNode");
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87 | }
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88 | if (n->getListener())
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89 | {
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90 | OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
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91 | mName + " cannot monitor node " + n->getName() + " since it already has a listener.",
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92 | "RibbonTrail::addNode");
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93 | }
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94 | size_t segIdx = mNodeList.size();
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95 | ChainSegment& seg = mChainSegmentList[segIdx];
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96 | // set up this segment
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97 | seg.head = seg.tail = SEGMENT_EMPTY;
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98 | // Create new element, v coord is always 0.0f
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99 | Element e(n->_getDerivedPosition(),
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100 | mInitialWidth[segIdx], 0.0f, mInitialColour[segIdx]);
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101 | // Add the start position
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102 | addChainElement(segIdx, e);
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103 | // Add another on the same spot, this will extend
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104 | addChainElement(segIdx, e);
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105 |
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106 | mNodeList.push_back(n);
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107 | n->setListener(this);
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108 |
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109 | }
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110 | //-----------------------------------------------------------------------
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111 | void RibbonTrail::removeNode(Node* n)
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112 | {
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113 | NodeList::iterator i = std::find(mNodeList.begin(), mNodeList.end(), n);
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114 | if (i != mNodeList.end())
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115 | {
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116 | n->setListener(0);
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117 | mNodeList.erase(i);
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118 | }
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119 | }
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120 | //-----------------------------------------------------------------------
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121 | RibbonTrail::NodeIterator
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122 | RibbonTrail::getNodeIterator(void) const
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123 | {
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124 | return NodeIterator(mNodeList.begin(), mNodeList.end());
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125 | }
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126 | //-----------------------------------------------------------------------
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127 | void RibbonTrail::setTrailLength(Real len)
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128 | {
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129 | mTrailLength = len;
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130 | mElemLength = mTrailLength / mMaxElementsPerChain;
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131 | mSquaredElemLength = mElemLength * mElemLength;
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132 | }
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133 | //-----------------------------------------------------------------------
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134 | void RibbonTrail::setMaxChainElements(size_t maxElements)
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135 | {
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136 | BillboardChain::setMaxChainElements(maxElements);
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137 | mElemLength = mTrailLength / mMaxElementsPerChain;
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138 | mSquaredElemLength = mElemLength * mElemLength;
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139 | }
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140 | //-----------------------------------------------------------------------
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141 | void RibbonTrail::setNumberOfChains(size_t numChains)
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142 | {
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143 | BillboardChain::setNumberOfChains(numChains);
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144 |
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145 | mInitialColour.resize(numChains, ColourValue::White);
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146 | mDeltaColour.resize(numChains, ColourValue::ZERO);
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147 | mInitialWidth.resize(numChains, 10);
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148 | mDeltaWidth.resize(numChains, 0);
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149 | }
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150 | //-----------------------------------------------------------------------
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151 | void RibbonTrail::setInitialColour(size_t chainIndex, const ColourValue& col)
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152 | {
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153 | setInitialColour(chainIndex, col.r, col.g, col.b, col.a);
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154 | }
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155 | //-----------------------------------------------------------------------
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156 | void RibbonTrail::setInitialColour(size_t chainIndex, Real r, Real g, Real b, Real a)
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157 | {
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158 | if (chainIndex >= mChainCount)
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159 | {
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160 | OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
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161 | "chainIndex out of bounds", "RibbonTrail::setInitialColour");
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162 | }
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163 | mInitialColour[chainIndex].r = r;
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164 | mInitialColour[chainIndex].g = g;
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165 | mInitialColour[chainIndex].b = b;
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166 | mInitialColour[chainIndex].a = a;
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167 | }
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168 | //-----------------------------------------------------------------------
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169 | const ColourValue& RibbonTrail::getInitialColour(size_t chainIndex) const
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170 | {
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171 | if (chainIndex >= mChainCount)
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172 | {
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173 | OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
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174 | "chainIndex out of bounds", "RibbonTrail::getInitialColour");
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175 | }
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176 | return mInitialColour[chainIndex];
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177 | }
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178 | //-----------------------------------------------------------------------
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179 | void RibbonTrail::setInitialWidth(size_t chainIndex, Real width)
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180 | {
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181 | if (chainIndex >= mChainCount)
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182 | {
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183 | OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
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184 | "chainIndex out of bounds", "RibbonTrail::setInitialWidth");
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185 | }
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186 | mInitialWidth[chainIndex] = width;
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187 | }
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188 | //-----------------------------------------------------------------------
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189 | Real RibbonTrail::getInitialWidth(size_t chainIndex) const
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190 | {
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191 | if (chainIndex >= mChainCount)
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192 | {
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193 | OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
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194 | "chainIndex out of bounds", "RibbonTrail::getInitialWidth");
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195 | }
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196 | return mInitialWidth[chainIndex];
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197 | }
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198 | //-----------------------------------------------------------------------
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199 | void RibbonTrail::setColourChange(size_t chainIndex, const ColourValue& valuePerSecond)
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200 | {
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201 | setColourChange(chainIndex,
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202 | valuePerSecond.r, valuePerSecond.g, valuePerSecond.b, valuePerSecond.a);
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203 | }
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204 | //-----------------------------------------------------------------------
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205 | void RibbonTrail::setColourChange(size_t chainIndex, Real r, Real g, Real b, Real a)
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206 | {
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207 | if (chainIndex >= mChainCount)
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208 | {
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209 | OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
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210 | "chainIndex out of bounds", "RibbonTrail::setColourChange");
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211 | }
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212 | mDeltaColour[chainIndex].r = r;
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213 | mDeltaColour[chainIndex].g = g;
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214 | mDeltaColour[chainIndex].b = b;
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215 | mDeltaColour[chainIndex].a = a;
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216 |
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217 | manageController();
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218 |
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219 | }
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220 | //-----------------------------------------------------------------------
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221 | const ColourValue& RibbonTrail::getColourChange(size_t chainIndex) const
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222 | {
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223 | if (chainIndex >= mChainCount)
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224 | {
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225 | OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
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226 | "chainIndex out of bounds", "RibbonTrail::getColourChange");
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227 | }
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228 | return mDeltaColour[chainIndex];
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229 | }
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230 | //-----------------------------------------------------------------------
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231 | void RibbonTrail::setWidthChange(size_t chainIndex, Real widthDeltaPerSecond)
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232 | {
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233 | if (chainIndex >= mChainCount)
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234 | {
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235 | OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
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236 | "chainIndex out of bounds", "RibbonTrail::setWidthChange");
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237 | }
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238 | mDeltaWidth[chainIndex] = widthDeltaPerSecond;
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239 | manageController();
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240 | }
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241 | //-----------------------------------------------------------------------
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242 | Real RibbonTrail::getWidthChange(size_t chainIndex) const
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243 | {
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244 | if (chainIndex >= mChainCount)
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245 | {
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246 | OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
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247 | "chainIndex out of bounds", "RibbonTrail::getWidthChange");
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248 | }
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249 | return mDeltaWidth[chainIndex];
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250 |
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251 | }
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252 | //-----------------------------------------------------------------------
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253 | void RibbonTrail::manageController(void)
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254 | {
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255 | bool needController = false;
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256 | for (size_t i = 0; i < mChainCount; ++i)
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257 | {
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258 | if (mDeltaWidth[i] != 0 || mDeltaColour[i] != ColourValue::ZERO)
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259 | {
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260 | needController = true;
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261 | break;
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262 | }
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263 | }
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264 | if (!mFadeController && needController)
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265 | {
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266 | // Set up fading via frame time controller
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267 | ControllerManager& mgr = ControllerManager::getSingleton();
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268 | mFadeController = mgr.createFrameTimePassthroughController(mTimeControllerValue);
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269 | }
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270 | else if (mFadeController && !needController)
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271 | {
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272 | // destroy controller
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273 | ControllerManager::getSingleton().destroyController(mFadeController);
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274 | mFadeController = 0;
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275 | }
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276 |
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277 | }
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278 | //-----------------------------------------------------------------------
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279 | void RibbonTrail::nodeUpdated(const Node* node)
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280 | {
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281 |
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282 | for (size_t idx = 0; idx < mNodeList.size(); ++idx)
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283 | {
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284 | if (mNodeList[idx] == node)
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285 | {
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286 | updateTrail(idx, node);
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287 | break;
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288 | }
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289 | }
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290 | }
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291 | //-----------------------------------------------------------------------
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292 | void RibbonTrail::nodeDestroyed(const Node* node)
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293 | {
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294 | removeNode(const_cast<Node*>(node));
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295 |
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296 | }
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297 | //-----------------------------------------------------------------------
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298 | void RibbonTrail::updateTrail(size_t index, const Node* node)
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299 | {
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300 | // Node has changed somehow, we're only interested in the derived position
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301 | ChainSegment& seg = mChainSegmentList[index];
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302 | Element& headElem = mChainElementList[seg.start + seg.head];
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303 | size_t nextElemIdx = seg.head + 1;
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304 | // wrap
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305 | if (nextElemIdx == mMaxElementsPerChain)
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306 | nextElemIdx = 0;
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307 | Element& nextElem = mChainElementList[seg.start + nextElemIdx];
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308 |
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309 | // Vary the head elem, but bake new version if that exceeds element len
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310 | Vector3 newPos = node->_getDerivedPosition();
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311 | if (mParentNode)
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312 | {
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313 | // Transform position to ourself space
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314 | newPos = mParentNode->_getDerivedOrientation().UnitInverse() *
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315 | (newPos - mParentNode->_getDerivedPosition()) / mParentNode->_getDerivedScale();
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316 | }
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317 | Vector3 diff = newPos - nextElem.position;
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318 | Real sqlen = diff.squaredLength();
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319 | if (sqlen >= mSquaredElemLength)
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320 | {
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321 | // Move existing head to mElemLength
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322 | Vector3 scaledDiff = diff * (mElemLength / Math::Sqrt(sqlen));
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323 | headElem.position = nextElem.position + scaledDiff;
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324 | // Add a new element to be the new head
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325 | Element newElem(newPos, mInitialWidth[index], 0.0f, mInitialColour[index]);
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326 | addChainElement(index, newElem);
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327 | // alter diff to represent new head size
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328 | diff = newPos - newElem.position;
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329 |
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330 | }
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331 | else
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332 | {
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333 | // Extend existing head
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334 | headElem.position = newPos;
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335 | }
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336 |
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337 | // Is this segment full?
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338 | if ((seg.tail + 1) % mMaxElementsPerChain == seg.head)
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339 | {
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340 | // If so, shrink tail gradually to match head extension
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341 | Element& tailElem = mChainElementList[seg.start + seg.tail];
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342 | size_t preTailIdx;
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343 | if (seg.tail == 0)
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344 | preTailIdx = mMaxElementsPerChain - 1;
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345 | else
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346 | preTailIdx = seg.tail - 1;
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347 | Element& preTailElem = mChainElementList[seg.start + preTailIdx];
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348 |
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349 | // Measure tail diff from pretail to tail
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350 | Vector3 taildiff = tailElem.position - preTailElem.position;
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351 | Real taillen = taildiff.length();
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352 | if (taillen > 1e-06)
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353 | {
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354 | Real tailsize = mElemLength - diff.length();
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355 | taildiff *= tailsize / taillen;
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356 | tailElem.position = preTailElem.position + taildiff;
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357 | }
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358 |
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359 | }
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360 |
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361 |
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362 | mBoundsDirty = true;
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363 | // Need to dirty the parent node, but can't do it using needUpdate() here
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364 | // since we're in the middle of the scene graph update (node listener),
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365 | // so re-entrant calls don't work. Queue.
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366 | if (mParentNode)
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367 | {
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368 | Node::queueNeedUpdate(getParentSceneNode());
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369 | }
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370 |
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371 | }
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372 | //-----------------------------------------------------------------------
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373 | void RibbonTrail::_timeUpdate(Real time)
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374 | {
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375 | // Apply all segment effects
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376 | for (size_t s = 0; s < mChainSegmentList.size(); ++s)
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377 | {
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378 | ChainSegment& seg = mChainSegmentList[s];
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379 | if (seg.head != SEGMENT_EMPTY && seg.head != seg.tail)
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380 | {
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381 |
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382 | for(size_t e = seg.head + 1;; ++e) // until break
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383 | {
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384 | e = e % mMaxElementsPerChain;
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385 |
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386 | Element& elem = mChainElementList[seg.start + e];
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387 | elem.width = elem.width - (time * mDeltaWidth[s]);
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388 | elem.width = std::max(Real(0.0f), elem.width);
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389 | elem.colour = elem.colour - (mDeltaColour[s] * time);
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390 | elem.colour.saturate();
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391 |
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392 | if (e == seg.tail)
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393 | break;
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394 |
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395 | }
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396 | }
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397 |
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398 | }
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399 |
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400 | }
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401 | //-----------------------------------------------------------------------
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402 | //-----------------------------------------------------------------------
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403 | String RibbonTrailFactory::FACTORY_TYPE_NAME = "RibbonTrail";
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404 | //-----------------------------------------------------------------------
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405 | const String& RibbonTrailFactory::getType(void) const
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406 | {
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407 | return FACTORY_TYPE_NAME;
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408 | }
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409 | //-----------------------------------------------------------------------
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410 | MovableObject* RibbonTrailFactory::createInstanceImpl( const String& name,
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411 | const NameValuePairList* params)
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412 | {
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413 | size_t maxElements = 20;
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414 | size_t numberOfChains = 1;
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415 | bool useTex = true;
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416 | bool useCol = true;
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417 | // optional params
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418 | if (params != 0)
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419 | {
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420 | NameValuePairList::const_iterator ni = params->find("maxElements");
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421 | if (ni != params->end())
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422 | {
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423 | maxElements = StringConverter::parseUnsignedLong(ni->second);
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424 | }
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425 | ni = params->find("numberOfChains");
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426 | if (ni != params->end())
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427 | {
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428 | numberOfChains = StringConverter::parseUnsignedLong(ni->second);
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429 | }
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430 | ni = params->find("useTextureCoords");
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431 | if (ni != params->end())
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432 | {
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433 | useTex = StringConverter::parseBool(ni->second);
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434 | }
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435 | ni = params->find("useVertexColours");
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436 | if (ni != params->end())
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437 | {
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438 | useCol = StringConverter::parseBool(ni->second);
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439 | }
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440 |
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441 | }
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442 |
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443 | return new RibbonTrail(name, maxElements, numberOfChains, useTex, useCol);
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444 |
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445 | }
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446 | //-----------------------------------------------------------------------
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447 | void RibbonTrailFactory::destroyInstance( MovableObject* obj)
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448 | {
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449 | delete obj;
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450 | }
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451 |
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452 |
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453 |
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454 |
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455 | }
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456 |
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