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#include <GL/glut.h>
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#include <GL/glut.h>
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using namespace CGLA;
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using namespace CGLA;
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Mat4x4f perspective_Mat4x4f(float d)
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{
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  Mat4x4f m(0.0f);
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  /* Eye at the origin, looking down the negative z axis */
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  m[0][0] = 1.0;
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  m[1][1] = 1.0;
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  m[2][2] = 1.0;
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  m[3][2] = -1.0/d;
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  return m;
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}
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static void display( void )
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static void display( void )
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{
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{
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  // ----------------------------------------
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  // ----------------------------------------
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  // 0. Set up viewing parameters
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  // 0. Set up viewing parameters
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  // Initialize GL, i.e. setup projection
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  // Initialize GL, i.e. setup projection
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  // and possibly other things as well
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  // and possibly other things as well
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  glClearColor(1,1,1,1);
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  glClearColor(1,1,1,1);
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  gluOrtho2D(-3,3,-3,3);
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  gluOrtho2D(-3,3,-3,3);
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}
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}
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// static void idle()
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// {
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//   glutPostRedisplay();
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// }
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static void init_GLUT(int argc, char *argv[])
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static void init_GLUT(int argc, char *argv[])
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{
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{
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  // Initialize glut, open and create window.
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  // Initialize glut, open and create window.
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  glutInit( &argc, argv );
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  glutInit( &argc, argv );
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  glutInitWindowSize( 400 , 400 );
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  glutInitWindowSize( 400 , 400 );
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  // Register callback functions
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  // Register callback functions
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  glutReshapeFunc( reshape );
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  glutReshapeFunc( reshape );
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  glutKeyboardFunc( key );
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  glutKeyboardFunc( key );
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  glutDisplayFunc( display );
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  glutDisplayFunc( display );
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  // glutIdleFunc( idle );
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}
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}
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int main( int argc, char *argv[] )
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int main( int argc, char *argv[] )
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{
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{
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  init_GLUT(argc, argv);
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  init_GLUT(argc, argv);