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 | You may use this sample code for anything you like, it is not covered by the |
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11 | LGPL like the rest of the engine. |
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12 | ----------------------------------------------------------------------------- |
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13 | */ |
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14 | |
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15 | /** |
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16 | \file |
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17 | Grass.cpp |
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18 | \brief |
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19 | Specialisation of OGRE's framework application to show the |
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20 | use of the StaticGeometry class to create 'baked' instances of |
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21 | many meshes, to create effects like grass efficiently. |
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22 | **/ |
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23 | |
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24 | #include "ExampleApplication.h" |
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25 | |
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26 | #if OGRE_PLATFORM == OGRE_PLATFORM_WIN32 |
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27 | #define WIN32_LEAN_AND_MEAN |
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28 | #include "windows.h" |
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29 | #endif |
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30 | |
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31 | |
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32 | #define KEY_PRESSED(_key,_timeDelay, _macro) \ |
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33 | { \ |
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34 | if (mKeyboard->isKeyDown(_key) && timeDelay <= 0) \ |
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35 | { \ |
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36 | timeDelay = _timeDelay; \ |
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37 | _macro ; \ |
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38 | } \ |
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39 | } |
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40 | |
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41 | #define GRASS_HEIGHT 300 |
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42 | #define GRASS_WIDTH 250 |
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43 | #define GRASS_MESH_NAME "grassblades" |
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44 | #define GRASS_MATERIAL "Examples/GrassBlades" |
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45 | #define OFFSET_PARAM 999 |
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46 | |
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47 | Light* mLight; |
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48 | SceneNode* mLightNode = 0; |
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49 | AnimationState* mAnimState = 0; |
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50 | ColourValue mMinLightColour(0.5, 0.1, 0.0); |
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51 | ColourValue mMaxLightColour(1.0, 0.6, 0.0); |
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52 | Real mMinFlareSize = 40; |
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53 | Real mMaxFlareSize = 80; |
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54 | StaticGeometry* mStaticGeom; |
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55 | |
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56 | |
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57 | /** This class 'wibbles' the light and billboard */ |
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58 | class LightWibbler : public ControllerValue<Real> |
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59 | { |
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60 | protected: |
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61 | Light* mLight; |
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62 | Billboard* mBillboard; |
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63 | ColourValue mColourRange; |
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64 | ColourValue mHalfColour; |
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65 | Real mMinSize; |
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66 | Real mSizeRange; |
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67 | Real intensity; |
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68 | public: |
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69 | LightWibbler(Light* light, Billboard* billboard, const ColourValue& minColour, |
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70 | const ColourValue& maxColour, Real minSize, Real maxSize) |
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71 | { |
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72 | mLight = light; |
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73 | mBillboard = billboard; |
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74 | mColourRange.r = (maxColour.r - minColour.r) * 0.5; |
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75 | mColourRange.g = (maxColour.g - minColour.g) * 0.5; |
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76 | mColourRange.b = (maxColour.b - minColour.b) * 0.5; |
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77 | mHalfColour = minColour + mColourRange; |
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78 | mMinSize = minSize; |
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79 | mSizeRange = maxSize - minSize; |
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80 | } |
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81 | |
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82 | virtual Real getValue (void) const |
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83 | { |
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84 | return intensity; |
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85 | } |
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86 | |
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87 | virtual void setValue (Real value) |
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88 | { |
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89 | intensity = value; |
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90 | |
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91 | ColourValue newColour; |
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92 | |
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93 | // Attenuate the brightness of the light |
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94 | newColour.r = mHalfColour.r + (mColourRange.r * intensity); |
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95 | newColour.g = mHalfColour.g + (mColourRange.g * intensity); |
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96 | newColour.b = mHalfColour.b + (mColourRange.b * intensity); |
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97 | |
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98 | mLight->setDiffuseColour(newColour); |
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99 | mBillboard->setColour(newColour); |
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100 | // set billboard size |
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101 | Real newSize = mMinSize + (intensity * mSizeRange); |
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102 | mBillboard->setDimensions(newSize, newSize); |
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103 | |
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104 | } |
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105 | }; |
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106 | |
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107 | class GrassListener : public ExampleFrameListener |
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108 | { |
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109 | protected: |
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110 | SceneManager* mSceneManager; |
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111 | bool mShowBBs; |
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112 | public: |
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113 | GrassListener(RenderWindow* win, Camera* cam, SceneManager* sceneManager) |
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114 | : ExampleFrameListener(win, cam), |
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115 | mSceneManager(sceneManager), mShowBBs(false) |
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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 waveGrass(Real timeElapsed) |
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121 | { |
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122 | static Real xinc = Math::PI * 0.4; |
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123 | static Real zinc = Math::PI * 0.55; |
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124 | static Real xpos = Math::RangeRandom(-Math::PI, Math::PI); |
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125 | static Real zpos = Math::RangeRandom(-Math::PI, Math::PI); |
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126 | |
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127 | xpos += xinc * timeElapsed; |
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128 | zpos += zinc * timeElapsed; |
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129 | |
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130 | // Update vertex program parameters by binding a value to each renderable |
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131 | static Vector4 offset(0,0,0,0); |
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132 | |
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133 | StaticGeometry::RegionIterator rit = mStaticGeom->getRegionIterator(); |
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134 | while (rit.hasMoreElements()) |
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135 | { |
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136 | StaticGeometry::Region* reg = rit.getNext(); |
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137 | |
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138 | // a little randomness |
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139 | xpos += reg->getCentre().x * 0.001; |
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140 | zpos += reg->getCentre().z * 0.001; |
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141 | offset.x = Math::Sin(xpos) * 5; |
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142 | offset.z = Math::Sin(zpos) * 5; |
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143 | |
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144 | StaticGeometry::Region::LODIterator lodit = reg->getLODIterator(); |
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145 | while (lodit.hasMoreElements()) |
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146 | { |
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147 | StaticGeometry::LODBucket* lod = lodit.getNext(); |
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148 | StaticGeometry::LODBucket::MaterialIterator matit = |
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149 | lod->getMaterialIterator(); |
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150 | while (matit.hasMoreElements()) |
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151 | { |
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152 | StaticGeometry::MaterialBucket* mat = matit.getNext(); |
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153 | StaticGeometry::MaterialBucket::GeometryIterator geomit = |
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154 | mat->getGeometryIterator(); |
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155 | while (geomit.hasMoreElements()) |
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156 | { |
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157 | StaticGeometry::GeometryBucket* geom = geomit.getNext(); |
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158 | geom->setCustomParameter(OFFSET_PARAM, offset); |
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159 | |
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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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166 | |
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167 | bool frameStarted(const FrameEvent& evt) |
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168 | { |
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169 | if( ExampleFrameListener::frameStarted(evt) == false ) |
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170 | return false; |
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171 | |
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172 | static Real timeDelay = 0; |
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173 | timeDelay -= evt.timeSinceLastFrame; |
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174 | |
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175 | if (mAnimState) |
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176 | mAnimState->addTime(evt.timeSinceLastFrame); |
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177 | |
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178 | KEY_PRESSED(OIS::KC_B, 1, |
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179 | mShowBBs = !mShowBBs; |
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180 | mSceneManager->showBoundingBoxes(mShowBBs); |
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181 | ) |
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182 | |
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183 | waveGrass(evt.timeSinceLastFrame); |
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184 | |
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185 | return true; |
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186 | } |
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187 | }; |
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188 | |
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189 | |
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190 | |
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191 | class Grass_Application : public ExampleApplication |
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192 | { |
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193 | public: |
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194 | Grass_Application() {} |
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195 | |
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196 | protected: |
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197 | SceneNode *mpObjsNode; // the node wich will hold our entities |
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198 | |
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199 | void createGrassMesh() |
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200 | { |
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201 | // Each grass section is 3 planes at 60 degrees to each other |
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202 | // Normals point straight up to simulate correct lighting |
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203 | MeshPtr msh = MeshManager::getSingleton().createManual(GRASS_MESH_NAME, |
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204 | ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME); |
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205 | SubMesh* sm = msh->createSubMesh(); |
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206 | sm->useSharedVertices = false; |
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207 | sm->vertexData = new VertexData(); |
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208 | sm->vertexData->vertexStart = 0; |
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209 | sm->vertexData->vertexCount = 12; |
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210 | VertexDeclaration* dcl = sm->vertexData->vertexDeclaration; |
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211 | size_t offset = 0; |
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212 | dcl->addElement(0, offset, VET_FLOAT3, VES_POSITION); |
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213 | offset += VertexElement::getTypeSize(VET_FLOAT3); |
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214 | dcl->addElement(0, offset, VET_FLOAT3, VES_NORMAL); |
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215 | offset += VertexElement::getTypeSize(VET_FLOAT3); |
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216 | dcl->addElement(0, offset, VET_FLOAT2, VES_TEXTURE_COORDINATES); |
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217 | offset += VertexElement::getTypeSize(VET_FLOAT2); |
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218 | |
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219 | HardwareVertexBufferSharedPtr vbuf = HardwareBufferManager::getSingleton() |
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220 | .createVertexBuffer( |
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221 | offset, 12, HardwareBuffer::HBU_STATIC_WRITE_ONLY); |
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222 | float* pReal = static_cast<float*>(vbuf->lock(HardwareBuffer::HBL_DISCARD)); |
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223 | Vector3 baseVec(GRASS_WIDTH/2, 0, 0); |
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224 | Vector3 vec = baseVec; |
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225 | Quaternion rot; |
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226 | rot.FromAngleAxis(Degree(60), Vector3::UNIT_Y); |
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227 | int i; |
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228 | for (i = 0; i < 3; ++i) |
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229 | { |
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230 | // position |
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231 | *pReal++ = -vec.x; |
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232 | *pReal++ = GRASS_HEIGHT; |
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233 | *pReal++ = -vec.z; |
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234 | // normal |
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235 | *pReal++ = 0; |
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236 | *pReal++ = 1; |
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237 | *pReal++ = 0; |
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238 | // uv |
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239 | *pReal++ = 0; |
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240 | *pReal++ = 0; |
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241 | |
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242 | // position |
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243 | *pReal++ = vec.x; |
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244 | *pReal++ = GRASS_HEIGHT; |
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245 | *pReal++ = vec.z; |
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246 | // normal |
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247 | *pReal++ = 0; |
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248 | *pReal++ = 1; |
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249 | *pReal++ = 0; |
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250 | // uv |
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251 | *pReal++ = 1; |
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252 | *pReal++ = 0; |
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253 | |
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254 | // position |
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255 | *pReal++ = -vec.x; |
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256 | *pReal++ = 0; |
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257 | *pReal++ = -vec.z; |
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258 | // normal |
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259 | *pReal++ = 0; |
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260 | *pReal++ = 1; |
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261 | *pReal++ = 0; |
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262 | // uv |
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263 | *pReal++ = 0; |
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264 | *pReal++ = 1; |
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265 | |
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266 | // position |
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267 | *pReal++ = vec.x; |
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268 | *pReal++ = 0; |
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269 | *pReal++ = vec.z; |
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270 | // normal |
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271 | *pReal++ = 0; |
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272 | *pReal++ = 1; |
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273 | *pReal++ = 0; |
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274 | // uv |
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275 | *pReal++ = 1; |
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276 | *pReal++ = 1; |
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277 | |
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278 | vec = rot * vec; |
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279 | } |
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280 | vbuf->unlock(); |
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281 | sm->vertexData->vertexBufferBinding->setBinding(0, vbuf); |
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282 | sm->indexData->indexCount = 6*3; |
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283 | sm->indexData->indexBuffer = HardwareBufferManager::getSingleton() |
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284 | .createIndexBuffer(HardwareIndexBuffer::IT_16BIT, 6*3, |
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285 | HardwareBuffer::HBU_STATIC_WRITE_ONLY); |
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286 | uint16* pI = static_cast<uint16*>( |
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287 | sm->indexData->indexBuffer->lock(HardwareBuffer::HBL_DISCARD)); |
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288 | for (i = 0; i < 3; ++i) |
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289 | { |
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290 | int off = i*4; |
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291 | *pI++ = 0 + off; |
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292 | *pI++ = 3 + off; |
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293 | *pI++ = 1 + off; |
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294 | |
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295 | *pI++ = 0 + off; |
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296 | *pI++ = 2 + off; |
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297 | *pI++ = 3 + off; |
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298 | } |
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299 | |
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300 | sm->indexData->indexBuffer->unlock(); |
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301 | |
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302 | sm->setMaterialName(GRASS_MATERIAL); |
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303 | msh->load(); |
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304 | |
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305 | } |
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306 | |
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307 | void setupLighting() |
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308 | { |
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309 | // Set ambient light |
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310 | mSceneMgr->setAmbientLight(ColourValue(0.2, 0.2, 0.2)); |
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311 | // Point light, movable, reddish |
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312 | mLight = mSceneMgr->createLight("Light2"); |
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313 | mLight->setDiffuseColour(mMinLightColour); |
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314 | mLight->setSpecularColour(1, 1, 1); |
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315 | mLight->setAttenuation(8000,1,0.0005,0); |
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316 | |
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317 | // Create light node |
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318 | mLightNode = mSceneMgr->getRootSceneNode()->createChildSceneNode( |
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319 | "MovingLightNode"); |
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320 | mLightNode->attachObject(mLight); |
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321 | // create billboard set |
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322 | BillboardSet* bbs = mSceneMgr->createBillboardSet("lightbbs", 1); |
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323 | bbs->setMaterialName("Examples/Flare"); |
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324 | Billboard* bb = bbs->createBillboard(0,0,0,mMinLightColour); |
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325 | // attach |
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326 | mLightNode->attachObject(bbs); |
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327 | |
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328 | // create controller, after this is will get updated on its own |
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329 | ControllerFunctionRealPtr func = ControllerFunctionRealPtr( |
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330 | new WaveformControllerFunction(Ogre::WFT_SINE, 0.0, 0.5)); |
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331 | ControllerManager& contMgr = ControllerManager::getSingleton(); |
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332 | ControllerValueRealPtr val = ControllerValueRealPtr( |
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333 | new LightWibbler(mLight, bb, mMinLightColour, mMaxLightColour, |
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334 | mMinFlareSize, mMaxFlareSize)); |
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335 | Controller<Real>* controller = contMgr.createController( |
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336 | contMgr.getFrameTimeSource(), val, func); |
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337 | |
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338 | //mLight->setPosition(Vector3(300,250,-300)); |
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339 | mLightNode->setPosition(Vector3(300,250,-300)); |
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340 | |
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341 | |
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342 | // Create a track for the light |
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343 | Animation* anim = mSceneMgr->createAnimation("LightTrack", 20); |
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344 | // Spline it for nice curves |
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345 | anim->setInterpolationMode(Animation::IM_SPLINE); |
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346 | // Create a track to animate the camera's node |
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347 | NodeAnimationTrack* track = anim->createNodeTrack(0, mLightNode); |
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348 | // Setup keyframes |
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349 | TransformKeyFrame* key = track->createNodeKeyFrame(0); // A startposition |
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350 | key->setTranslate(Vector3(300,550,-300)); |
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351 | key = track->createNodeKeyFrame(2);//B |
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352 | key->setTranslate(Vector3(150,600,-250)); |
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353 | key = track->createNodeKeyFrame(4);//C |
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354 | key->setTranslate(Vector3(-150,650,-100)); |
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355 | key = track->createNodeKeyFrame(6);//D |
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356 | key->setTranslate(Vector3(-400,500,-200)); |
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357 | key = track->createNodeKeyFrame(8);//E |
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358 | key->setTranslate(Vector3(-200,500,-400)); |
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359 | key = track->createNodeKeyFrame(10);//F |
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360 | key->setTranslate(Vector3(-100,450,-200)); |
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361 | key = track->createNodeKeyFrame(12);//G |
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362 | key->setTranslate(Vector3(-100,400,180)); |
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363 | key = track->createNodeKeyFrame(14);//H |
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364 | key->setTranslate(Vector3(0,250,600)); |
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365 | key = track->createNodeKeyFrame(16);//I |
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366 | key->setTranslate(Vector3(100,650,100)); |
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367 | key = track->createNodeKeyFrame(18);//J |
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368 | key->setTranslate(Vector3(250,600,0)); |
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369 | key = track->createNodeKeyFrame(20);//K == A |
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370 | key->setTranslate(Vector3(300,550,-300)); |
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371 | // Create a new animation state to track this |
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372 | mAnimState = mSceneMgr->createAnimationState("LightTrack"); |
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373 | mAnimState->setEnabled(true); |
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374 | } |
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375 | |
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376 | void createScene(void) |
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377 | { |
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378 | |
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379 | mSceneMgr->setSkyBox(true, "Examples/SpaceSkyBox"); |
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380 | |
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381 | setupLighting(); |
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382 | |
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383 | |
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384 | Plane plane; |
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385 | plane.normal = Vector3::UNIT_Y; |
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386 | plane.d = 0; |
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387 | MeshManager::getSingleton().createPlane("Myplane", |
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388 | ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME, plane, |
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389 | 14500,14500,10,10,true,1,50,50,Vector3::UNIT_Z); |
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390 | Entity* pPlaneEnt = mSceneMgr->createEntity( "plane", "Myplane" ); |
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391 | pPlaneEnt->setMaterialName("Examples/GrassFloor"); |
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392 | pPlaneEnt->setCastShadows(false); |
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393 | mSceneMgr->getRootSceneNode()->createChildSceneNode()->attachObject(pPlaneEnt); |
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394 | |
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395 | Vector3 minV(-2000,0,-2000); |
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396 | Vector3 maxV(2000,0,2000); |
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397 | |
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398 | |
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399 | createGrassMesh(); |
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400 | |
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401 | Entity* e = mSceneMgr->createEntity("1", GRASS_MESH_NAME); |
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402 | |
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403 | StaticGeometry* s = mSceneMgr->createStaticGeometry("bing"); |
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404 | s->setRegionDimensions(Vector3(1000,1000,1000)); |
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405 | // Set the region origin so the centre is at 0 world |
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406 | s->setOrigin(Vector3(-500, 500, -500)); |
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407 | |
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408 | for (int x = -1950; x < 1950; x += 150) |
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409 | { |
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410 | for (int z = -1950; z < 1950; z += 150) |
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411 | { |
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412 | Vector3 pos( |
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413 | x + Math::RangeRandom(-25, 25), |
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414 | 0, |
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415 | z + Math::RangeRandom(-25, 25)); |
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416 | Quaternion orientation; |
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417 | orientation.FromAngleAxis( |
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418 | Degree(Math::RangeRandom(0, 359)), |
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419 | Vector3::UNIT_Y); |
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420 | Vector3 scale( |
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421 | 1, Math::RangeRandom(0.85, 1.15), 1); |
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422 | s->addEntity(e, pos, orientation, scale); |
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423 | } |
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424 | |
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425 | } |
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426 | |
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427 | s->build(); |
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428 | mStaticGeom = s; |
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429 | |
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430 | // Put an Ogre head in the middle |
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431 | MeshPtr m = MeshManager::getSingleton().load("ogrehead.mesh", |
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432 | ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME); |
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433 | unsigned short src, dest; |
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434 | if (!m->suggestTangentVectorBuildParams(VES_TANGENT, src, dest)) |
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435 | { |
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436 | m->buildTangentVectors(VES_TANGENT, src, dest); |
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437 | } |
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438 | e = mSceneMgr->createEntity("head", "ogrehead.mesh"); |
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439 | e->setMaterialName("Examples/OffsetMapping/Specular"); |
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440 | SceneNode* headNode = mSceneMgr->getRootSceneNode()->createChildSceneNode(); |
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441 | headNode->attachObject(e); |
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442 | headNode->setScale(7,7,7); |
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443 | headNode->setPosition(0,200,0); |
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444 | e->setNormaliseNormals(true); |
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445 | mCamera->move(Vector3(0,350,0)); |
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446 | } |
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447 | |
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448 | // Create new frame listener |
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449 | void createFrameListener(void) |
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450 | { |
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451 | mFrameListener= new GrassListener(mWindow, mCamera, mSceneMgr); |
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452 | mRoot->addFrameListener(mFrameListener); |
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453 | } |
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454 | }; |
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455 | |
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456 | #ifdef __cplusplus |
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457 | extern "C" { |
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458 | #endif |
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459 | |
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460 | #if OGRE_PLATFORM == OGRE_PLATFORM_WIN32 |
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461 | INT WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR strCmdLine, INT ) |
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462 | #else |
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463 | int main(int argc, char **argv) |
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464 | #endif |
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465 | { |
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466 | // Create application object |
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467 | Grass_Application app; |
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468 | |
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469 | try { |
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470 | app.go(); |
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471 | } catch( Exception& e ) { |
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472 | #if OGRE_PLATFORM == OGRE_PLATFORM_WIN32 |
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473 | MessageBox( NULL, e.getFullDescription().c_str(), "An exception has occured!", MB_OK | MB_ICONERROR | MB_TASKMODAL); |
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474 | #else |
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475 | std::cerr << "An exception has occured: " << e.getFullDescription(); |
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476 | #endif |
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477 | } |
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478 | |
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479 | return 0; |
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480 | } |
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481 | |
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482 | #ifdef __cplusplus |
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483 | } |
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484 | #endif |
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485 | |
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