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99 lines
2.7 KiB
C++
99 lines
2.7 KiB
C++
#ifndef OPENMW_COMPONENTS_TERRAIN_QUADTREENODE_H
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#define OPENMW_COMPONENTS_TERRAIN_QUADTREENODE_H
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#include <osg/Group>
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#include "defs.hpp"
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namespace Terrain
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{
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enum ChildDirection
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{
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NW = 0,
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NE = 1,
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SW = 2,
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SE = 3,
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Root
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};
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class QuadTreeNode;
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class LodCallback : public osg::Referenced
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{
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public:
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virtual ~LodCallback() {}
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enum ReturnValue
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{
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Deeper,
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StopTraversal,
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StopTraversalAndUse
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};
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virtual ReturnValue isSufficientDetail(QuadTreeNode* node, float dist) = 0;
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};
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class ViewData;
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float distance(const osg::BoundingBox&, const osg::Vec3f& v);
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class QuadTreeNode : public osg::Group
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{
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public:
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QuadTreeNode(QuadTreeNode* parent, ChildDirection dir, float size, const osg::Vec2f& center);
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virtual ~QuadTreeNode();
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inline QuadTreeNode* getParent() { return mParent; }
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inline QuadTreeNode* getChild(unsigned int i) { return static_cast<QuadTreeNode*>(Group::getChild(i)); }
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inline unsigned int getNumChildren() const override { return _children.size(); }
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// osg::Group::addChild() does a lot of unrelated stuff, but we just really want to add a child node.
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void addChildNode(QuadTreeNode* child)
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{
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// QuadTree node should not contain more than 4 child nodes.
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// Reserve enough space if this node is supposed to have child nodes.
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_children.reserve(4);
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_children.push_back(child);
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child->addParent(this);
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}
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float distance(const osg::Vec3f& v) const;
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/// Returns our direction relative to the parent node, or Root if we are the root node.
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ChildDirection getDirection() { return mDirection; }
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/// Get neighbour node in this direction
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QuadTreeNode* getNeighbour(Direction dir);
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/// Initialize neighbours - do this after the quadtree is built
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void initNeighbours();
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void setBoundingBox(const osg::BoundingBox& boundingBox);
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const osg::BoundingBox& getBoundingBox() const;
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bool hasValidBounds() const { return mValidBounds; }
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/// size in cell coordinates
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float getSize() const;
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/// center in cell coordinates
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const osg::Vec2f& getCenter() const;
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/// Traverse nodes according to LOD selection.
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void traverseNodes(ViewData* vd, const osg::Vec3f& viewPoint, LodCallback* lodCallback);
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private:
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QuadTreeNode* mParent;
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QuadTreeNode* mNeighbours[4];
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ChildDirection mDirection;
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osg::BoundingBox mBoundingBox;
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bool mValidBounds;
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float mSize;
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osg::Vec2f mCenter;
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};
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}
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#endif
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