/* Two figures, one with smooth shading and one with flat.

Written by Scott D. Anderson
scott.anderson@acm.org
Fall 2003
*/

#include <stdio.h>
#include <tw.h>

const int S = 8;                // slices and stacks

void display(void) {
    twDisplayInit();
    twCamera();
    GLfloat lightPos[] = { 2, 2, 2, 1 };
    twGrayLight(GL_LIGHT0,lightPos,0.2,0.8,0.8);
    glEnable(GL_LIGHTING);

    twTriple cornflower = {100.0/255, 149.0/255, 237.0/255};

    twColor(cornflower, 0.7, 10);

    glShadeModel(GL_FLAT);
    glPushMatrix();
    glTranslatef(-1,0,0);
    glutSolidSphere(0.9,S,S);
    glPopMatrix();
    
    glShadeModel(GL_SMOOTH);
    glPushMatrix();
    glTranslatef(+1,0,0);
    glutSolidSphere(0.9,S,S);
    glPopMatrix();

    glFlush();
    glutSwapBuffers();
}

int main(int argc, char** argv) {
  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
  twInitWindowSize(500,300);
  glutCreateWindow(argv[0]);
  const float SIZE = 0.7;
  twBoundingBox(-2*SIZE,+2*SIZE,-SIZE,+SIZE,-SIZE,+SIZE); // a lie, to get us closer
  twMainInit(); 
  glutDisplayFunc(display);
  glutMainLoop();
  return 0;
}