120 lines
2.9 KiB
C++
120 lines
2.9 KiB
C++
/**
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* @file v4math.cpp
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* @brief LLVector4 class implementation.
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*
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* $LicenseInfo:firstyear=2000&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010, 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 "linden_common.h"
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#include "v3math.h"
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#include "v4math.h"
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#include "m4math.h"
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#include "m3math.h"
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#include "llquaternion.h"
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// LLVector4
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// Axis-Angle rotations
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const LLVector4& LLVector4::rotVec(const LLMatrix4& mat)
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{
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*this = *this * mat;
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return *this;
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}
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const LLVector4& LLVector4::rotVec(const LLQuaternion& q)
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{
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*this = *this * q;
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return *this;
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}
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const LLVector4& LLVector4::scaleVec(const LLVector4& vec)
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{
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mV[VX] *= vec.mV[VX];
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mV[VY] *= vec.mV[VY];
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mV[VZ] *= vec.mV[VZ];
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mV[VW] *= vec.mV[VW];
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return *this;
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}
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// Sets all values to absolute value of their original values
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// Returns true if data changed
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bool LLVector4::abs()
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{
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bool ret{ false };
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if (mV[VX] < 0.f) { mV[VX] = -mV[VX]; ret = true; }
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if (mV[VY] < 0.f) { mV[VY] = -mV[VY]; ret = true; }
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if (mV[VZ] < 0.f) { mV[VZ] = -mV[VZ]; ret = true; }
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if (mV[VW] < 0.f) { mV[VW] = -mV[VW]; ret = true; }
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return ret;
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}
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std::ostream& operator<<(std::ostream& s, const LLVector4& a)
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{
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s << "{ " << a.mV[VX] << ", " << a.mV[VY] << ", " << a.mV[VZ] << ", " << a.mV[VW] << " }";
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return s;
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}
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// Non-member functions
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F32 angle_between( const LLVector4& a, const LLVector4& b )
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{
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LLVector4 an = a;
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LLVector4 bn = b;
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an.normalize();
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bn.normalize();
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F32 cosine = an * bn;
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F32 angle = (cosine >= 1.0f) ? 0.0f :
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(cosine <= -1.0f) ? F_PI :
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acos(cosine);
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return angle;
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}
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bool are_parallel(const LLVector4 &a, const LLVector4 &b, F32 epsilon)
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{
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LLVector4 an = a;
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LLVector4 bn = b;
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an.normalize();
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bn.normalize();
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F32 dot = an * bn;
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if ( (1.0f - fabs(dot)) < epsilon)
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return true;
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return false;
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}
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LLVector3 vec4to3(const LLVector4& vec)
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{
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return LLVector3( vec.mV[VX], vec.mV[VY], vec.mV[VZ] );
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}
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LLVector4 vec3to4(const LLVector3& vec)
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{
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return LLVector4(vec.mV[VX], vec.mV[VY], vec.mV[VZ]);
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}
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