#if !defined(Linux)
  #include <windows.h>           //Not Linux must be windows
#endif
#include <stdio.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.h>


void reshape(int x, int y) {
/* problem: if reshaping done, drawn pixel doesn't correspond
   to x, y */

   glViewport(0, 0, x, y);
   /* glOrtho(0.0, x, 0.0, y, -1.0, 1.0);  <-- keep commented or 
						won't rewrite screen */
   glClear(GL_COLOR_BUFFER_BIT);
   glFlush();
}

void redraw(void) {
   glClear(GL_COLOR_BUFFER_BIT);

}

void mouse(int btn, int state, int x, int y) {
   int yy;

   yy = glutGet(GLUT_WINDOW_HEIGHT);
   y = yy - y;   /* In Glut, Y coordinate increases from top to bottom */

   glColor3f(1.0, 1.0, 1.0);
   glBegin(GL_POINTS); 
      glVertex2i(x, y);
   glEnd();
   glFlush();

   if (state == GLUT_DOWN) {
      printf("DOWN: x=%3d  y=%3d \n", x, y);
   }
   else {
      printf("UP: x=%3d  y=%3d \n", x, y);
   }
}

void motion(int x, int y) {
   int yy;

   yy = glutGet(GLUT_WINDOW_HEIGHT);
   y = yy - y;

   glColor3f(1.0, 1.0, 1.0);
   glBegin(GL_POINTS); 
      glVertex2i(x, y);
   glEnd();
   glFlush();

   printf("motion: x=%3d  y=%3d \n", x, y);
}

void keyboard(unsigned char key, int x, int y) {

   switch (key){
      case 0x1B:
      case 'q':
      case 'Q':
#if !defined(Linux)
  	 exit(0);
#else
	  return;
#endif

	 break;

      case 'm':
      case 'M':
         printf("M: x=%3d  y=%3d \n", x, y);
	 break;
   }
}

main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitWindowSize(512, 512);
    glutInitDisplayMode(GLUT_RGB);
    glutCreateWindow("Glut mouse");

    glutMouseFunc(mouse);
    glutPassiveMotionFunc(motion);
    glutKeyboardFunc(keyboard);
    glutDisplayFunc(redraw);
    glutReshapeFunc(reshape);

    glMatrixMode(GL_PROJECTION);
    gluOrtho2D(0.0, 511.0, 0.0, 511.0);
    glClearColor(0.0, 0.0, 0.0, 1.0);

    glutMainLoop();
}