/* The teapot, but with two lights, which can be turned on/off
   independently.

Written by Caroline Geiersbach and Scott D. Anderson
scott.anderson@acm.org
Summer 2003

Fall 2005, added a second light and the key callbacks.

*/

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

bool Light0 = true;
bool Light1 = true;

void display(void) {
    twDisplayInit();
    twCamera();

    glEnable(GL_LIGHTING);
    glShadeModel(GL_SMOOTH);

    twAmbient(0);                // turn down ambient to make the lights more obvious
    GLfloat light0[] = { 1, 1, 1, 1 };
    twGrayLight(GL_LIGHT0, light0, 0.1, 0.7, 0.7);
    if(Light0)
        glEnable(GL_LIGHT0);
    else
        glDisable(GL_LIGHT0);
    GLfloat light1[] = { 0, 1, 0, 0 };
    twGrayLight(GL_LIGHT1, light1, 0.1, 0.8, 0.8);
    if(Light1)
        glEnable(GL_LIGHT1);
    else
        glDisable(GL_LIGHT1);

    twTriple pewter = {0.8, 0.8, 0.8};
    twColor(pewter,0.9,64);
    glutSolidTeapot(1);

    glFlush();
    glutSwapBuffers();   // necessary for animation
}

void lightToggle(unsigned char k, int x, int y) {
    switch(k) {
    case '1': Light0 = !Light0; break;
    case '2': Light1 = !Light1; break;
    }
    glutPostRedisplay(); 
}

int main(int argc, char** argv) {
  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
  twInitWindowSize(650,650);
  glutCreateWindow(argv[0]);
  twBoundingBox(-1,+1,-1,+1,-1,+1);
  twMainInit(); 
  twKeyCallback('1', lightToggle, "Toggle first light");
  twKeyCallback('2', lightToggle, "Toggle second light");
  glutDisplayFunc(display);
  glutMainLoop();
  return 0;
}