81 lines
2.3 KiB
C++
81 lines
2.3 KiB
C++
/**
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* @file llmatrix4a.cpp
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* @brief Functions for vectorized matrix/vector operations
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*
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* $LicenseInfo:firstyear=2018&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2018, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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#include "llmath.h"
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#include "llmatrix4a.h"
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// Convert a bounding box into other coordinate system. Should give
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// the same results as transforming every corner of the bounding box
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// and extracting the bounding box of that, although that's not
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// necessarily the fastest way to implement.
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void matMulBoundBox(const LLMatrix4a &mat, const LLVector4a *in_extents, LLVector4a *out_extents)
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{
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//get 8 corners of bounding box
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LLVector4Logical mask[6];
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for (U32 i = 0; i < 6; ++i)
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{
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mask[i].clear();
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}
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mask[0].setElement<2>(); //001
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mask[1].setElement<1>(); //010
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mask[2].setElement<1>(); //011
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mask[2].setElement<2>();
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mask[3].setElement<0>(); //100
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mask[4].setElement<0>(); //101
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mask[4].setElement<2>();
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mask[5].setElement<0>(); //110
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mask[5].setElement<1>();
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LLVector4a v[8];
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v[6] = in_extents[0];
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v[7] = in_extents[1];
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for (U32 i = 0; i < 6; ++i)
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{
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v[i].setSelectWithMask(mask[i], in_extents[0], in_extents[1]);
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}
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LLVector4a tv[8];
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//transform bounding box into drawable space
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for (U32 i = 0; i < 8; ++i)
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{
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mat.affineTransform(v[i], tv[i]);
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}
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//find bounding box
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out_extents[0] = out_extents[1] = tv[0];
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for (U32 i = 1; i < 8; ++i)
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{
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out_extents[0].setMin(out_extents[0], tv[i]);
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out_extents[1].setMax(out_extents[1], tv[i]);
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}
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}
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