libigl_Martin/include/igl/unproject.cpp

#include "unproject.h"
#ifndef IGL_NO_OPENGL

#include "OpenGL_convenience.h"

IGL_INLINE int igl::unproject(
  const double winX,
  const double winY,
  const double winZ,
  double* objX,
  double* objY,
  double* objZ)
{
  // Put model, projection, and viewport matrices into double arrays
  double MV[16];
  double P[16];
  int VP[4];
  glGetDoublev(GL_MODELVIEW_MATRIX,  MV);
  glGetDoublev(GL_PROJECTION_MATRIX, P);
  glGetIntegerv(GL_VIEWPORT, VP);
  return gluUnProject(winX,winY,winZ,MV,P,VP,objX,objY,objZ);
}

template <typename Derivedwin, typename Derivedobj>
IGL_INLINE int igl::unproject(
  const Eigen::PlainObjectBase<Derivedwin> & win,
  Eigen::PlainObjectBase<Derivedobj> & obj)
{
  return unproject(win(0),win(1),win(2),
      &obj.data()[0],
      &obj.data()[1],
      &obj.data()[2]);
}

#ifndef IGL_HEADER_ONLY
// Explicit template instanciation
template int igl::unproject<Eigen::Matrix<double, 3, 1, 0, 3, 1>, Eigen::Matrix<double, 3, 1, 0, 3, 1> >(Eigen::PlainObjectBase<Eigen::Matrix<double, 3, 1, 0, 3, 1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<double, 3, 1, 0, 3, 1> >&);
#endif

#endif