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89 lines
3.5 KiB
C++
89 lines
3.5 KiB
C++
/*****************************************************************************************
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* *
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* OpenSpace *
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* *
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* Copyright (c) 2014-2016 *
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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 __FRUSTRUMCULLER_H__
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#define __FRUSTRUMCULLER_H__
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#include <memory>
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#include <glm/glm.hpp>
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// open space includes
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#include <openspace/rendering/renderable.h>
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#include <modules/globebrowsing/geodetics/geodetic2.h>
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namespace openspace {
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class LonLatPatch;
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using namespace glm;
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class FrustrumCuller {
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public:
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FrustrumCuller();
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~FrustrumCuller();
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/**
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Returns true if the point is inside the view frustrum defined in RenderData.
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The third argument marginScreenSpace is added to the default screen space
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boundaries. E.g. for marginScreenSpace = {0.2, 0.2}, all points with
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1.2 < x,y < 1.2 would cause isVisible to return true.
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*/
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bool isVisible(
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const RenderData& data,
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const vec3& point,
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const vec2& marginScreenSpace = vec2(0));
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/**
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Returns false if the patch element is guaranteed to be outside the view
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frustrum, and true is the patch element MAY be inside the view frustrum.
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*/
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bool isVisible(
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const RenderData& data,
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const GeodeticPatch& patch,
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double radius);
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private:
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/**
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Returns true if the point in screen space is inside the view frustrum.
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The optional screen space margin vector is used to resize area defining
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what is considered to be inside the view frustrum.
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*/
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bool testPoint(
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const glm::vec2& pointScreenSpace,
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const glm::vec2& marginScreenSpace) const;
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glm::vec2 transformToScreenSpace(const vec3& point, const mat4x4& modelViewProjection) const;
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};
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} // namespace openspace
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#endif // __FRUSTRUMCULLER_H__
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