/* Example from Hill, Figure 2.10, modified to work using Mesa */

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

void myInit(void) {
    glClearColor(1.0,1.0,1.0,0.0);	// set white background colour
    glColor3f(0.0f, 0.0f, 0.0f);	// set the drawing colour
    glPointSize(4.0);			// a dot is 4 by 4 pixels
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(0.0, 640.0, 0.0, 480.0);
}

void myDisplay(void) {
    glClear(GL_COLOR_BUFFER_BIT);	// clear the screen 
    glBegin(GL_POINTS);
        glVertex2i(100, 50);		// draw three points
        glVertex2i(100, 130);
        glVertex2i(150, 130);
    glEnd();
    glFlush();				// send all output to display
}

int main(int argc, char** argv) {
    glutInit(&argc, argv);		// initialize the toolkit
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB); // set display mode
    glutInitWindowSize(640,480);	// set window size
    glutInitWindowPosition(100, 150);	// set window position on screen
    glutCreateWindow("my first attempt"); // open the screen window
    glutDisplayFunc(myDisplay);		// register redraw function
    myInit();
    glutMainLoop();			// go into a perpetual loop
    return 0;				// never reached
}