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124 lines
4.2 KiB
C++
124 lines
4.2 KiB
C++
/*****************************************************************************************
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* *
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* OpenSpace *
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* *
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* Copyright (c) 2014-2016 *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this *
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* software and associated documentation files (the "Software"), to deal in the Software *
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* without restriction, including without limitation the rights to use, copy, modify, *
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* merge, publish, distribute, sublicense, and/or sell copies of the Software, and to *
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* permit persons to whom the Software is furnished to do so, subject to the following *
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* conditions: *
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* *
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* The above copyright notice and this permission notice shall be included in all copies *
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* or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, *
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A *
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* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT *
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF *
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE *
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* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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****************************************************************************************/
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#ifndef __QUADTREE_H__
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#define __QUADTREE_H__
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#include <glm/glm.hpp>
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#include <vector>
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#include <memory>
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#include <ostream>
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#include <modules/globebrowsing/geodetics/geodetic2.h>
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#include <modules/globebrowsing/rendering/patchrenderer.h>
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// forward declaration
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namespace openspace {
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class ChunkLodGlobe;
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}
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namespace openspace {
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enum Quad {
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NORTH_WEST,
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NORTH_EAST,
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SOUTH_WEST,
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SOUTH_EAST
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};
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struct ChunkIndex {
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int x, y, level;
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// TODO : NOT SURE WHAT IS RIGHT BUT I SWITCHED THE TWO MIDDLE INDICES FOR IT TO WORK
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std::vector<ChunkIndex> childIndices() const {
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return {
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{ 2 * x + 0, 2 * y + 0, level + 1 },
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{ 2 * x + 1, 2 * y + 0, level + 1 },
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{ 2 * x + 0, 2 * y + 1, level + 1 },
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{ 2 * x + 1, 2 * y + 1, level + 1 },
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};
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}
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};
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class ChunkNode {
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public:
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ChunkNode(ChunkLodGlobe&, const GeodeticPatch&, ChunkNode* parent = nullptr);
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~ChunkNode();
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void split(int depth = 1);
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void merge();
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bool isRoot() const;
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bool isLeaf() const;
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const ChunkNode& getChild(Quad quad) const;
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void render(const RenderData& data, ChunkIndex);
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static int instanceCount;
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static int renderedPatches;
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private:
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void internalRender(const RenderData& data, ChunkIndex&);
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bool internalUpdateChunkTree(const RenderData& data, ChunkIndex& traverseData);
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/**
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Uses horizon culling, frustum culling and distance to camera to determine a
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desired level.
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In the current implementation of the horizon culling and the distance to the
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camera, the closer the ellipsoid is to a
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sphere, the better this will make the splitting. Using the minimum radius to
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be safe. This means that if the ellipsoid has high difference between radii,
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splitting might accur even though it is not needed.
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*/
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int calculateDesiredLevelAndUpdateIsVisible(
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const RenderData& data,
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const ChunkIndex& traverseData);
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ChunkNode* _parent;
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std::unique_ptr<ChunkNode> _children[4];
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ChunkLodGlobe& _owner;
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GeodeticPatch _patch;
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bool _isVisible;
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};
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} // namespace openspace
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#endif // __QUADTREE_H__
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