mirror of
https://github.com/OpenSpace/OpenSpace.git
synced 2026-04-22 02:48:25 -05:00
Alexander Bock
77 lines
3.5 KiB
C++
77 lines
3.5 KiB
C++
/*****************************************************************************************
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* *
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* OpenSpace *
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* *
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* Copyright (c) 2014-2020 *
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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 __OPENSPACE_MODULE_GAIA___OCTREECULLER___H__
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#define __OPENSPACE_MODULE_GAIA___OCTREECULLER___H__
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#include <modules/globebrowsing/src/basictypes.h>
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#include <vector>
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// TODO: Move /geometry/* to libOpenSpace so as not to depend on globebrowsing.
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namespace openspace {
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/**
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* Culls all octree nodes that are completely outside the view frustum.
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*
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* The frustum culling uses a 2D axis aligned bounding box for the OctreeNode in
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* screen space.
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*/
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class OctreeCuller {
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public:
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/**
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* \param viewFrustum is the view space in normalized device coordinates space.
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* Hence it is an axis aligned bounding box and not a real frustum.
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*/
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OctreeCuller(globebrowsing::AABB3 viewFrustum);
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~OctreeCuller() = default;
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/**
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* \return true if any part of the node is visible in the current view.
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*/
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bool isVisible(const std::vector<glm::dvec4>& corners, const glm::dmat4& mvp);
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/**
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* \return the size [in pixels] of the node in clipping space.
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*/
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glm::vec2 getNodeSizeInPixels(const std::vector<glm::dvec4>& corners,
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const glm::dmat4& mvp, const glm::vec2& screenSize);
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private:
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/**
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* Creates an axis-aligned bounding box containing all \p corners in clipping space.
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*/
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void createNodeBounds(const std::vector<glm::dvec4>& corners, const glm::dmat4& mvp);
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const globebrowsing::AABB3 _viewFrustum;
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globebrowsing::AABB3 _nodeBounds;
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};
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} // namespace openspace
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#endif // __OPENSPACE_MODULE_GAIA___OCTREECULLER___H__
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