GlutExaminer.cc

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//=============================================================================
//
//  CLASS GlutExaminer - IMPLEMENTATION
//
//=============================================================================

//== INCLUDES =================================================================


#include "GlutExaminer.hh"
#include "../Utils/StopWatch.hh"


//== NAMESPACES ===============================================================


namespace ACG {


//== IMPLEMENTATION ========================================================== 


GlutExaminer::
GlutExaminer(const char* _title, int _width, int _height)
  : GlutViewer(_title, _width, _height),
    trackball_(glstate_),
    center_(Vec3f(0.0,0.0,0.0)),
    radius_(1.0)
{
  init();
}


//-----------------------------------------------------------------------------


void 
GlutExaminer::init()
{
  trackball_.set_center(Vec3f(0,0,0));
}


//-----------------------------------------------------------------------------


void 
GlutExaminer::draw()
{
  ACG::GLState::enable(GL_LIGHTING);
  ACG::GLState::shadeModel(GL_SMOOTH);
  glutSolidTeapot(0.5);
}


//-----------------------------------------------------------------------------


void 
GlutExaminer::mouse(int button, int state, int x, int y)
{
  if (state == GLUT_DOWN)  trackball_.mouse_press(button, x, y);
  else                     trackball_.mouse_release(button, x, y);
  glutPostRedisplay();
}


//-----------------------------------------------------------------------------


void 
GlutExaminer::motion(int x, int y)
{
  trackball_.mouse_move(x, y);
  glutPostRedisplay();
}


//-----------------------------------------------------------------------------


void 
GlutExaminer::keyboard(int key, int x, int y) 
{
  switch (key)
  {
    case 'f':
    {
      std::cerr << "Performance test: ";
      double fps = measure_fps();
      std::cerr << fps << " FPS\n";
      break;
    }

    default:
    {
      GlutViewer::keyboard(key, x, y);
      break;
    }
  }
}


//-----------------------------------------------------------------------------


void 
GlutExaminer::setup_scene(const Vec3f& _center, float _radius)
{
  center_ = _center;
  radius_ = _radius;

  trackball_.set_center(_center);

  near_  = 0.01f * radius_;
  far_   = 10.0f * radius_;
  update_projection();

  view_all();
}


//-----------------------------------------------------------------------------


void 
GlutExaminer::view_all()
{
  ACG::Vec3d t = (-(glstate_.modelview().transform_point(center_))
                  - Vec3d(0.0f, 0.0f, 3.0f*radius_));
  glstate_.translate(t[0], t[1], t[2], MULT_FROM_LEFT);
}


//-----------------------------------------------------------------------------


double 
GlutExaminer::measure_fps()
{
  const Vec3d t = glstate_.modelview().transform_point(center_);

  glMatrixMode(GL_MODELVIEW);
  glPushMatrix();

  StopWatch timer; timer.start();
        
  for (int i=0; i<72; ++i)
  {
    glstate_.translate(-t[0], -t[1], -t[2], MULT_FROM_LEFT);
    glstate_.rotate(5.0f, 0.0f, 1.0f, 0.0f, MULT_FROM_LEFT);
    glstate_.translate( t[0],  t[1],  t[2], MULT_FROM_LEFT);
    display();
  }
  glFinish();

  double elapsed = timer.stop();

  glPopMatrix();
  glutPostRedisplay();

  return (1000.0 / elapsed * 72.0);
}


//=============================================================================
} // namespace ACG
//=============================================================================