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			154 lines
		
	
	
	
		
			5.7 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
			
		
		
	
	
			154 lines
		
	
	
	
		
			5.7 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
| #ifndef COMPONENTS_TERRAIN_H
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| #define COMPONENTS_TERRAIN_H
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| 
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| #include <OgreHardwareIndexBuffer.h>
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| #include <OgreHardwareVertexBuffer.h>
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| #include <OgreAxisAlignedBox.h>
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| #include <OgreTexture.h>
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| 
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| namespace Loading
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| {
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|     class Listener;
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| }
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| 
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| namespace Ogre
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| {
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|     class Camera;
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| }
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| 
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| namespace Terrain
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| {
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| 
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|     class QuadTreeNode;
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|     class Storage;
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| 
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|     /**
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|      * @brief A quadtree-based terrain implementation suitable for large data sets. \n
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|      *        Near cells are rendered with alpha splatting, distant cells are merged
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|      *        together in batches and have their layers pre-rendered onto a composite map. \n
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|      *        Cracks at LOD transitions are avoided using stitching.
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|      * @note  Multiple cameras are not supported yet
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|      */
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|     class World
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|     {
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|     public:
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|         /// @note takes ownership of \a storage
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|         /// @param loadingListener Listener to update with progress
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|         /// @param sceneMgr scene manager to use
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|         /// @param storage Storage instance to get terrain data from (heights, normals, colors, textures..)
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|         /// @param visbilityFlags visibility flags for the created meshes
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|         /// @param distantLand Whether to draw all of the terrain, or only a 3x3 grid around the camera.
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|         ///         This is a temporary option until it can be streamlined.
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|         /// @param shaders Whether to use splatting shader, or multi-pass fixed function splatting. Shader is usually
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|         ///         faster so this is just here for compatibility.
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|         World(Loading::Listener* loadingListener, Ogre::SceneManager* sceneMgr,
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|                 Storage* storage, int visiblityFlags, bool distantLand, bool shaders);
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|         ~World();
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| 
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|         void setLoadingListener(Loading::Listener* loadingListener) { mLoadingListener = loadingListener; }
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| 
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|         bool getDistantLandEnabled() { return mDistantLand; }
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|         bool getShadersEnabled() { return mShaders; }
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|         bool getShadowsEnabled() { return mShadows; }
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|         bool getSplitShadowsEnabled() { return mSplitShadows; }
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| 
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|         float getHeightAt (const Ogre::Vector3& worldPos);
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| 
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|         /// Update chunk LODs according to this camera position
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|         /// @note Calling this method might lead to composite textures being rendered, so it is best
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|         /// not to call it when render commands are still queued, since that would cause a flush.
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|         void update (const Ogre::Vector3& cameraPos);
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| 
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|         /// Get the world bounding box of a chunk of terrain centered at \a center
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|         Ogre::AxisAlignedBox getWorldBoundingBox (const Ogre::Vector2& center);
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| 
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|         Ogre::SceneManager* getSceneManager() { return mSceneMgr; }
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| 
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|         Ogre::SceneNode* getRootSceneNode() { return mRootSceneNode; }
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| 
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|         Storage* getStorage() { return mStorage; }
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| 
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|         /// Show or hide the whole terrain
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|         /// @note this setting will be invalidated once you call Terrain::update, so do not call it while the terrain should be hidden
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|         void setVisible(bool visible);
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|         bool getVisible();
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| 
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|         /// Recreate materials used by terrain chunks. This should be called whenever settings of
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|         /// the material factory are changed. (Relying on the factory to update those materials is not
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|         /// enough, since turning a feature on/off can change the number of texture units available for layer/blend
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|         /// textures, and to properly respond to this we may need to change the structure of the material, such as
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|         /// adding or removing passes. This can only be achieved by a full rebuild.)
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|         void applyMaterials(bool shadows, bool splitShadows);
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| 
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|         int getVisiblityFlags() { return mVisibilityFlags; }
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| 
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|         int getMaxBatchSize() { return mMaxBatchSize; }
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| 
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|         void enableSplattingShader(bool enabled);
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| 
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|     private:
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|         bool mDistantLand;
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|         bool mShaders;
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|         bool mShadows;
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|         bool mSplitShadows;
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|         bool mVisible;
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| 
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|         Loading::Listener* mLoadingListener;
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| 
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|         QuadTreeNode* mRootNode;
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|         Ogre::SceneNode* mRootSceneNode;
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|         Storage* mStorage;
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| 
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|         int mVisibilityFlags;
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| 
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|         Ogre::SceneManager* mSceneMgr;
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|         Ogre::SceneManager* mCompositeMapSceneMgr;
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| 
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|         /// Bounds in cell units
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|         Ogre::AxisAlignedBox mBounds;
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| 
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|         /// Minimum size of a terrain batch along one side (in cell units)
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|         float mMinBatchSize;
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|         /// Maximum size of a terrain batch along one side (in cell units)
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|         float mMaxBatchSize;
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| 
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|         void buildQuadTree(QuadTreeNode* node);
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| 
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|     public:
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|         // ----INTERNAL----
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| 
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|         enum IndexBufferFlags
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|         {
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|             IBF_North = 1 << 0,
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|             IBF_East  = 1 << 1,
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|             IBF_South = 1 << 2,
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|             IBF_West  = 1 << 3
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|         };
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| 
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|         /// @param flags first 4*4 bits are LOD deltas on each edge, respectively (4 bits each)
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|         ///              next 4 bits are LOD level of the index buffer (LOD 0 = don't omit any vertices)
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|         /// @param numIndices number of indices that were used will be written here
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|         Ogre::HardwareIndexBufferSharedPtr getIndexBuffer (int flags, size_t& numIndices);
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| 
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|         Ogre::HardwareVertexBufferSharedPtr getVertexBuffer (int numVertsOneSide);
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| 
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|         Ogre::SceneManager* getCompositeMapSceneManager() { return mCompositeMapSceneMgr; }
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| 
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|         // Delete all quads
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|         void clearCompositeMapSceneManager();
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|         void renderCompositeMap (Ogre::TexturePtr target);
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| 
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|     private:
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|         // Index buffers are shared across terrain batches where possible. There is one index buffer for each
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|         // combination of LOD deltas and index buffer LOD we may need.
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|         std::map<int, Ogre::HardwareIndexBufferSharedPtr> mIndexBufferMap;
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| 
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|         std::map<int, Ogre::HardwareVertexBufferSharedPtr> mUvBufferMap;
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| 
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|         Ogre::RenderTarget* mCompositeMapRenderTarget;
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|         Ogre::TexturePtr mCompositeMapRenderTexture;
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|     };
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| 
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| }
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| 
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| #endif
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