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/*=========================================================================
Program: Visualization Toolkit
Module: $RCSfile: vtkgluPickMatrix.h,v $
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
// .NAME vtkgluPickMatrix - implement selected glu functionality
// .SECTION Description
// This file implements selected glu functionality to avoid
// system dependencies on glu.
#ifndef vtkgluPickMatrix_h
#define vtkgluPickMatrix_h
#ifndef VTK_IMPLEMENT_MESA_CXX
# include "vtkOpenGL.h" // Needed for GLfloat and GLdouble.
#endif
// This function was copied from Mesa and sets up the pick matrix
inline void vtkgluPickMatrix( GLdouble x, GLdouble y,
GLdouble width, GLdouble height,
int *origin, int *size )
{
GLfloat m[16];
GLfloat sx, sy;
GLfloat tx, ty;
sx = size[0] / width;
sy = size[1] / height;
tx = (size[0] + 2.0 * (origin[0] - x)) / width;
ty = (size[1] + 2.0 * (origin[1] - y)) / height;
#define M(row,col) m[col*4+row]
M(0,0) = sx; M(0,1) = 0.0; M(0,2) = 0.0; M(0,3) = tx;
M(1,0) = 0.0; M(1,1) = sy; M(1,2) = 0.0; M(1,3) = ty;
M(2,0) = 0.0; M(2,1) = 0.0; M(2,2) = 1.0; 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
glMultMatrixf( m );
}
#endif
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