You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
111 lines
2.7 KiB
111 lines
2.7 KiB
/***************************************************************************
|
|
sq_glu.cpp - description
|
|
-------------------
|
|
begin : ??? ??? 29 2004
|
|
copyright : (C) 2004 by Baryshev Dmitry
|
|
email : ksquirrel.iv@gmail.com
|
|
***************************************************************************/
|
|
|
|
/*
|
|
* Mesa 3-D graphics library
|
|
* Version: 3.5
|
|
* Copyright (C) 1995-2001 Brian Paul
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Library General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; if not, write to the Free
|
|
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include "sq_glu.h"
|
|
|
|
#include <cmath>
|
|
|
|
/*
|
|
* Replacement for gluLookAt().
|
|
*/
|
|
void SQ_GLU::gluLookAt(GLdouble eyex, GLdouble eyey, GLdouble eyez, GLdouble centerx, GLdouble centery, GLdouble centerz, GLdouble upx, GLdouble upy, GLdouble upz)
|
|
{
|
|
GLdouble m[16];
|
|
GLdouble x[3], y[3], z[3];
|
|
GLdouble mag;
|
|
|
|
z[0] = eyex - centerx;
|
|
z[1] = eyey - centery;
|
|
z[2] = eyez - centerz;
|
|
|
|
mag = sqrt(z[0] * z[0] + z[1] * z[1] + z[2] * z[2]);
|
|
|
|
if(mag)
|
|
{
|
|
z[0] /= mag;
|
|
z[1] /= mag;
|
|
z[2] /= mag;
|
|
}
|
|
|
|
y[0] = upx;
|
|
y[1] = upy;
|
|
y[2] = upz;
|
|
|
|
x[0] = y[1] * z[2] - y[2] * z[1];
|
|
x[1] = -y[0] * z[2] + y[2] * z[0];
|
|
x[2] = y[0] * z[1] - y[1] * z[0];
|
|
|
|
y[0] = z[1] * x[2] - z[2] * x[1];
|
|
y[1] = -z[0] * x[2] + z[2] * x[0];
|
|
y[2] = z[0] * x[1] - z[1] * x[0];
|
|
|
|
mag = sqrt(x[0] * x[0] + x[1] * x[1] + x[2] * x[2]);
|
|
|
|
if(mag)
|
|
{
|
|
x[0] /= mag;
|
|
x[1] /= mag;
|
|
x[2] /= mag;
|
|
}
|
|
|
|
mag = sqrt(y[0] * y[0] + y[1] * y[1] + y[2] * y[2]);
|
|
|
|
if(mag)
|
|
{
|
|
y[0] /= mag;
|
|
y[1] /= mag;
|
|
y[2] /= mag;
|
|
}
|
|
|
|
#define M(row,col) m[col*4+row]
|
|
M(0, 0) = x[0];
|
|
M(0, 1) = x[1];
|
|
M(0, 2) = x[2];
|
|
M(0, 3) = 0.0;
|
|
M(1, 0) = y[0];
|
|
M(1, 1) = y[1];
|
|
M(1, 2) = y[2];
|
|
M(1, 3) = 0.0;
|
|
M(2, 0) = z[0];
|
|
M(2, 1) = z[1];
|
|
M(2, 2) = z[2];
|
|
M(2, 3) = 0.0;
|
|
M(3, 0) = 0.0;
|
|
M(3, 1) = 0.0;
|
|
M(3, 2) = 0.0;
|
|
M(3, 3) = 1.0;
|
|
#undef M
|
|
|
|
glMultMatrixd(m);
|
|
glTranslated(-eyex, -eyey, -eyez);
|
|
}
|