69 lines
2.7 KiB
C++
69 lines
2.7 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2018 Danny Robson <danny@nerdcruft.net>
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*/
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#include "frustum.hpp"
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using util::geom::frustum;
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///////////////////////////////////////////////////////////////////////////////
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template <typename T>
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frustum<T>::frustum (const matrix4<T> &transform)
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{
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// left
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planes[0].coefficients[0] = transform[3][0] + transform[0][0];
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planes[0].coefficients[1] = transform[3][1] + transform[0][1];
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planes[0].coefficients[2] = transform[3][2] + transform[0][2];
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planes[0].coefficients[3] = transform[3][3] + transform[0][3];
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// Right clipping plane
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planes[1].coefficients[0] = transform[3][0] - transform[0][0];
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planes[1].coefficients[1] = transform[3][1] - transform[0][1];
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planes[1].coefficients[2] = transform[3][2] - transform[0][2];
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planes[1].coefficients[3] = transform[3][3] - transform[0][3];
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// Top clipping plane
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planes[2].coefficients[0] = transform[3][0] - transform[1][0];
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planes[2].coefficients[1] = transform[3][1] - transform[1][1];
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planes[2].coefficients[2] = transform[3][2] - transform[1][2];
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planes[2].coefficients[3] = transform[3][3] - transform[1][3];
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// Bottom clipping plane
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planes[3].coefficients[0] = transform[3][0] + transform[1][0];
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planes[3].coefficients[1] = transform[3][1] + transform[1][1];
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planes[3].coefficients[2] = transform[3][2] + transform[1][2];
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planes[3].coefficients[3] = transform[3][3] + transform[1][3];
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// Near clipping plane
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planes[4].coefficients[0] = transform[3][0] + transform[2][0];
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planes[4].coefficients[1] = transform[3][1] + transform[2][1];
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planes[4].coefficients[2] = transform[3][2] + transform[2][2];
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planes[4].coefficients[3] = transform[3][3] + transform[2][3];
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// Far clipping plane
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planes[5].coefficients[0] = transform[3][0] - transform[2][0];
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planes[5].coefficients[1] = transform[3][1] - transform[2][1];
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planes[5].coefficients[2] = transform[3][2] - transform[2][2];
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planes[5].coefficients[3] = transform[3][3] - transform[2][3];
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for (auto &p: planes)
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p = normalised (p);
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}
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///////////////////////////////////////////////////////////////////////////////
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template struct util::geom::frustum<float>;
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