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61 lines
3.4 KiB
C++
61 lines
3.4 KiB
C++
/*****************************************************************************************
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* *
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* OpenSpace *
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* *
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* Copyright (c) 2014-2017 *
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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/chunk/culling/frustumculler.h>
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#include <modules/globebrowsing/chunk/chunk.h>
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#include <modules/globebrowsing/globes/renderableglobe.h>
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#include <openspace/util/updatestructures.h>
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namespace openspace::globebrowsing::culling {
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FrustumCuller::FrustumCuller(AABB3 viewFrustum)
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: _viewFrustum(std::move(viewFrustum))
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{}
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bool FrustumCuller::isCullable(const Chunk& chunk, const RenderData& data) {
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// Calculate the MVP matrix
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glm::dmat4 modelTransform = chunk.owner().modelTransform();
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glm::dmat4 viewTransform = glm::dmat4(data.camera.combinedViewMatrix());
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glm::dmat4 modelViewProjectionTransform = glm::dmat4(data.camera.sgctInternal.projectionMatrix())
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* viewTransform * modelTransform;
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const std::vector<glm::dvec4>& corners = chunk.getBoundingPolyhedronCorners();
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// Create a bounding box that fits the patch corners
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AABB3 bounds; // in screen space
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std::vector<glm::vec4> clippingSpaceCorners(8);
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for (size_t i = 0; i < 8; ++i) {
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glm::dvec4 cornerClippingSpace = modelViewProjectionTransform * corners[i];
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clippingSpaceCorners[i] = cornerClippingSpace;
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glm::dvec3 ndc = glm::dvec3((1.0f / glm::abs(cornerClippingSpace.w)) * cornerClippingSpace);
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bounds.expand(ndc);
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}
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return !(_viewFrustum.intersects(bounds));
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}
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} // namespace openspace::globebrowsing::culling
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