Danny Robson
f6056153e3
This places, at long last, the core library code into the same namespace as the extended library code.
61 lines
2.5 KiB
C++
61 lines
2.5 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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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 cruft::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[X_NEG].coefficients[0] = transform[3][0] + transform[0][0];
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planes[X_NEG].coefficients[1] = transform[3][1] + transform[0][1];
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planes[X_NEG].coefficients[2] = transform[3][2] + transform[0][2];
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planes[X_NEG].coefficients[3] = transform[3][3] + transform[0][3];
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// Right clipping plane
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planes[X_POS].coefficients[0] = transform[3][0] - transform[0][0];
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planes[X_POS].coefficients[1] = transform[3][1] - transform[0][1];
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planes[X_POS].coefficients[2] = transform[3][2] - transform[0][2];
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planes[X_POS].coefficients[3] = transform[3][3] - transform[0][3];
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// Top clipping plane
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planes[Y_POS].coefficients[0] = transform[3][0] - transform[1][0];
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planes[Y_POS].coefficients[1] = transform[3][1] - transform[1][1];
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planes[Y_POS].coefficients[2] = transform[3][2] - transform[1][2];
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planes[Y_POS].coefficients[3] = transform[3][3] - transform[1][3];
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// Bottom clipping plane
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planes[Y_NEG].coefficients[0] = transform[3][0] + transform[1][0];
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planes[Y_NEG].coefficients[1] = transform[3][1] + transform[1][1];
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planes[Y_NEG].coefficients[2] = transform[3][2] + transform[1][2];
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planes[Y_NEG].coefficients[3] = transform[3][3] + transform[1][3];
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// Near clipping plane
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planes[Z_POS].coefficients[0] = transform[3][0] + transform[2][0];
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planes[Z_POS].coefficients[1] = transform[3][1] + transform[2][1];
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planes[Z_POS].coefficients[2] = transform[3][2] + transform[2][2];
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planes[Z_POS].coefficients[3] = transform[3][3] + transform[2][3];
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// Far clipping plane
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planes[Z_NEG].coefficients[0] = transform[3][0] - transform[2][0];
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planes[Z_NEG].coefficients[1] = transform[3][1] - transform[2][1];
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planes[Z_NEG].coefficients[2] = transform[3][2] - transform[2][2];
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planes[Z_NEG].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 cruft::geom::frustum<float>;
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