[1] | 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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