/*   prac1a.c   */

/* 
   Purpose:  Open a window and set background colour.
*/

#ifdef __APPLE__
#include <GLUT/glut.h>
#else
#include <GL/glut.h>
#endif

#include <stdlib.h>
#include <stdio.h>


GLvoid display(GLvoid)
{
	/*  Do all your OpenGL rendering here  */
	glClear(GL_COLOR_BUFFER_BIT);

	glFlush();
}

void init(void)
{
	/* set background color */
	glClearColor(1.0,1.0,0.0,1.0);
}

int main(int argc, char* argv[])
{
	GLint width;
	GLint height;

	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);

	width = glutGet(GLUT_SCREEN_WIDTH);
	height = glutGet(GLUT_SCREEN_HEIGHT);
	glutInitWindowPosition(width/4, height/4);
	glutInitWindowSize(width/2, height/2);
	glutCreateWindow(argv[0]);

	glutDisplayFunc(display);

	init();

	glutMainLoop();

	return 0;
}