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

void patch(void) {
    int i, j;

    glClear(GL_COLOR_BUFFER_BIT);
    glColor3f(1.0, 1.0, 1.0);
    glBegin(GL_POINTS);
       for (i = 0; i < 20; i++) {
	   for (j = 0; j < 20; j++) {
	      glVertex2i(i*20+10, j*20+50);
	   }
        }
    glEnd();
    glFlush();
}

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

   switch (key){
      case 0x1B:
      case 'q':
      case 'Q':
	 exit(0);
	 break;
   }
}

main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitWindowSize(400, 400);
    glutInitDisplayMode(GLUT_RGB);
    glutCreateWindow("glut pointpatch");
    glutDisplayFunc(patch);
    glutKeyboardFunc(keyboard);

    glClearColor(0.0, 0.0, 0.0, 1.0);
    glOrtho(0.0, 400.0, 0.0, 400.0, -1.0, 1.0);

    glutMainLoop();
}