/*
 * This is a very basic Windows C application for testing GLUT (and compatible
 * implementations such as freeglut). It displays a red square, and exits when
 * the escape key is pressed.
 */

#include <stdlib.h>
#include <GL/glut.h>

/* Keyboard callback function */
void keyboard(unsigned char key, int x, int y)
{
  switch (key)
    {
      /* Exit on escape key press */
      case '\x1B':
      {
        exit(EXIT_SUCCESS);
        break;
      }
    }
}

/* Display callback function */
void display()
{
  glClear(GL_COLOR_BUFFER_BIT);

  /* Display a red square */
  glColor3f(1.0f, 0.0f, 0.0f);

  glBegin(GL_POLYGON);
  glVertex2f(-0.5f, -0.5f);
  glVertex2f(0.5f, -0.5f);
  glVertex2f(0.5f,  0.5f);
  glVertex2f(-0.5f,  0.5f);
  glEnd();

  glFlush();
}

/* Main method */
int main(int argc, char** argv)
{
  glutInit(&argc, argv);

  /* Create a single window with a keyboard and display callback */
  glutCreateWindow("GLUT Test");
  glutKeyboardFunc(&keyboard);
  glutDisplayFunc(&display);

  /* Run the GLUT event loop */
  glutMainLoop();

  return EXIT_SUCCESS;
}