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 * For license and list of authors, see ../../doc/intro.pdf
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 * For license and list of authors, see ../../doc/intro.pdf
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 * ----------------------------------------------------------------------- */
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 * ----------------------------------------------------------------------- */
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#include "gel_glu.h"
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#include "gel_glu.h"
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#include "GLViewController.h"
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#include "GLViewController.h"
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#include "../CGLA/Mat3x3f.h"
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using namespace std;
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using namespace std;
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using namespace CGLA;
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using namespace CGLA;
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namespace GLGraphics
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namespace GLGraphics
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    znear = 0.01f*rad;
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    znear = 0.01f*rad;
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    zfar = 3*rad;
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    zfar = 3*rad;
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    reset_projection();
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    reset_projection();
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  }
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  }
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  void GLViewController::set_view_param(const Vec3f& e, const Vec3f& c, const Vec3f& u)
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  {
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    // native viewing direction is the negative z-axis
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    // while right is the x-axis and up is the y-axis
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    Vec3f view = c - e;
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    float eye_dist = length(view);
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    view /= eye_dist;
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    Vec3f right = normalize(cross(view, u));
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    Vec3f up = cross(right, view);
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    Mat3x3f rot(right, up, -view);
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    rot = transpose(rot); // since matrix is row-major
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    // convert the change-of-basis matrix to a quaternion
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    Quatf qrot;
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    qrot.make_rot(rot);
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    set_rotation(qrot);
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    set_centre(c);
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    set_eye_dist(eye_dist);
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  }
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  bool GLViewController::load(std::ifstream& ifs)
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  bool GLViewController::load(std::ifstream& ifs)
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  {
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  {
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    if(ifs)
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    if(ifs)
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    {
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    {
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      ifs.read(reinterpret_cast<char*>(this), sizeof(GLViewController));
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      ifs.read(reinterpret_cast<char*>(this), sizeof(GLViewController));
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      ball.set_screen_window(WINX, WINY);
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      ball.set_screen_window(WINX, WINY);
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      return true;
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      return true;
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    }
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    }
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    return false;
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    return false;
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  }
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  }
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  bool GLViewController::save(std::ofstream& ofs) const
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  bool GLViewController::save(std::ofstream& ofs) const
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  {
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  {
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    if(ofs)
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    if(ofs)
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    {
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    {
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      ofs.write(reinterpret_cast<const char*>(this), sizeof(GLViewController));
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      ofs.write(reinterpret_cast<const char*>(this), sizeof(GLViewController));