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68 lines
3.4 KiB
C++
68 lines
3.4 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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#include <modules/globebrowsing/rendering/frustrumculler.h>
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namespace {
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const std::string _loggerCat = "FrustrumCuller";
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}
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namespace openspace {
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//////////////////////////////////////////////////////////////////////////////////////
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// PATCH RENDERER //
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//////////////////////////////////////////////////////////////////////////////////////
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FrustrumCuller::FrustrumCuller(float tolerance)
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: _tolerance(tolerance)
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{
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}
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FrustrumCuller::~FrustrumCuller() {
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}
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bool FrustrumCuller::isVisible(const vec3& point, const mat4x4& modelViewProjection) {
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vec4 pointModelSpace(point, 1.0f);
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vec4 pointProjectionSpace = modelViewProjection * pointModelSpace;
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vec2 pointScreenSpace = (1.0f / pointProjectionSpace.w) * pointProjectionSpace.xy;
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// just for readability
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const vec2& p = pointScreenSpace;
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return ((-_tolerance < p.x && p.x < _tolerance) &
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(-_tolerance < p.y && p.y < _tolerance));
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}
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bool FrustrumCuller::isVisible(const LatLonPatch& patch, double radius, const mat4x4& modelViewProjection) {
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return isVisible(radius * patch.northWestCorner().asUnitCartesian(), modelViewProjection)
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|| isVisible(radius * patch.northEastCorner().asUnitCartesian(), modelViewProjection)
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|| isVisible(radius * patch.southWestCorner().asUnitCartesian(), modelViewProjection)
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|| isVisible(radius * patch.southEastCorner().asUnitCartesian(), modelViewProjection);
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}
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} // namespace openspace
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