v4math.cpp
上传用户:king477883
上传日期:2021-03-01
资源大小:9553k
文件大小:3k
- /**
- * @file v4math.cpp
- * @brief LLVector4 class implementation.
- *
- * $LicenseInfo:firstyear=2000&license=viewergpl$
- *
- * Copyright (c) 2000-2010, Linden Research, Inc.
- *
- * Second Life Viewer Source Code
- * The source code in this file ("Source Code") is provided by Linden Lab
- * to you under the terms of the GNU General Public License, version 2.0
- * ("GPL"), unless you have obtained a separate licensing agreement
- * ("Other License"), formally executed by you and Linden Lab. Terms of
- * the GPL can be found in doc/GPL-license.txt in this distribution, or
- * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
- *
- * There are special exceptions to the terms and conditions of the GPL as
- * it is applied to this Source Code. View the full text of the exception
- * in the file doc/FLOSS-exception.txt in this software distribution, or
- * online at
- * http://secondlifegrid.net/programs/open_source/licensing/flossexception
- *
- * By copying, modifying or distributing this software, you acknowledge
- * that you have read and understood your obligations described above,
- * and agree to abide by those obligations.
- *
- * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
- * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
- * COMPLETENESS OR PERFORMANCE.
- * $/LicenseInfo$
- */
- #include "linden_common.h"
- //#include "vmath.h"
- #include "v3math.h"
- #include "v4math.h"
- #include "m4math.h"
- #include "m3math.h"
- #include "llquaternion.h"
- // LLVector4
- // Axis-Angle rotations
- /*
- const LLVector4& LLVector4::rotVec(F32 angle, const LLVector4 &vec)
- {
- if ( !vec.isExactlyZero() && angle )
- {
- *this = *this * LLMatrix4(angle, vec);
- }
- return *this;
- }
- const LLVector4& LLVector4::rotVec(F32 angle, F32 x, F32 y, F32 z)
- {
- LLVector3 vec(x, y, z);
- if ( !vec.isExactlyZero() && angle )
- {
- *this = *this * LLMatrix4(angle, vec);
- }
- return *this;
- }
- */
- const LLVector4& LLVector4::rotVec(const LLMatrix4 &mat)
- {
- *this = *this * mat;
- return *this;
- }
- const LLVector4& LLVector4::rotVec(const LLQuaternion &q)
- {
- *this = *this * q;
- return *this;
- }
- const LLVector4& LLVector4::scaleVec(const LLVector4& vec)
- {
- mV[VX] *= vec.mV[VX];
- mV[VY] *= vec.mV[VY];
- mV[VZ] *= vec.mV[VZ];
- mV[VW] *= vec.mV[VW];
- return *this;
- }
- // Sets all values to absolute value of their original values
- // Returns TRUE if data changed
- BOOL LLVector4::abs()
- {
- BOOL ret = FALSE;
- if (mV[0] < 0.f) { mV[0] = -mV[0]; ret = TRUE; }
- if (mV[1] < 0.f) { mV[1] = -mV[1]; ret = TRUE; }
- if (mV[2] < 0.f) { mV[2] = -mV[2]; ret = TRUE; }
- if (mV[3] < 0.f) { mV[3] = -mV[3]; ret = TRUE; }
- return ret;
- }
- std::ostream& operator<<(std::ostream& s, const LLVector4 &a)
- {
- s << "{ " << a.mV[VX] << ", " << a.mV[VY] << ", " << a.mV[VZ] << ", " << a.mV[VW] << " }";
- return s;
- }
- // Non-member functions
- F32 angle_between( const LLVector4& a, const LLVector4& b )
- {
- LLVector4 an = a;
- LLVector4 bn = b;
- an.normalize();
- bn.normalize();
- F32 cosine = an * bn;
- F32 angle = (cosine >= 1.0f) ? 0.0f :
- (cosine <= -1.0f) ? F_PI :
- acos(cosine);
- return angle;
- }
- BOOL are_parallel(const LLVector4 &a, const LLVector4 &b, F32 epsilon)
- {
- LLVector4 an = a;
- LLVector4 bn = b;
- an.normalize();
- bn.normalize();
- F32 dot = an * bn;
- if ( (1.0f - fabs(dot)) < epsilon)
- return TRUE;
- return FALSE;
- }
- LLVector3 vec4to3(const LLVector4 &vec)
- {
- return LLVector3( vec.mV[VX], vec.mV[VY], vec.mV[VZ] );
- }
- LLVector4 vec3to4(const LLVector3 &vec)
- {
- return LLVector4(vec.mV[VX], vec.mV[VY], vec.mV[VZ]);
- }