/* Solution to the material and lighting lab exercise.  Based on TeddyBearLit.cc

Written by Scott D. Anderson
scott.anderson@acm.org
Fall 2006
*/

#include <stdio.h>
#include <tw.h>
#include <f05/objects.h>

bool Light0 = true;
bool Light1 = true;

void display(void) {
    twDisplayInit();
    twCamera(); // sets up camera based on bounding box coords.

    glEnable(GL_LIGHTING);
    glShadeModel(GL_SMOOTH);        // smooth shading looks nicer
    twAmbient(0.1);   // turn down ambient to make the lights more obvious

    // light from upper left; both lights are there.
    GLfloat lightPos[] = { -4, 5, 8, 1 }; 

    // 50% gray light, for first phase
    twGrayLight(GL_LIGHT0,lightPos,0.5,0.5,0.5);
    if(Light0)
        glEnable(GL_LIGHT0);
    else
        glDisable(GL_LIGHT0);

    // pink light, for second phase
    const GLfloat d = 500;
    GLfloat lightAmb[] = { 255/d, 182/d, 193/d, 1 }; // pink
    GLfloat lightDiff[] = { 255/d, 182/d, 193/d, 1 };
    GLfloat lightSpec[] = { 255/d, 182/d, 193/d, 1 };

    glLightfv(GL_LIGHT1, GL_POSITION, lightPos);
    glLightfv(GL_LIGHT1, GL_AMBIENT, lightAmb);
    glLightfv(GL_LIGHT1, GL_DIFFUSE, lightDiff);
    glLightfv(GL_LIGHT1, GL_SPECULAR, lightSpec);
    if(Light1)
        glEnable(GL_LIGHT1);
    else
        glDisable(GL_LIGHT1);


    // light blue ball
    const GLfloat e = 255;
    GLfloat ballColor[] = { 191/e, 239/e, 255/e };
    twColor(ballColor,0.9,20);
    glPushMatrix();
    glTranslatef(3,0,0);        // put the sphere to the right
    boat();
    //glutSolidSphere(2.5,40,40);
    glPopMatrix();

    // light green triangle
    const GLfloat f = 255;
    GLfloat triangleColor[] = { 144/f, 238/f, 144/f };
    twColor(triangleColor,0.5,2);
    glPushMatrix();
    glTranslatef(-1,0,0);       // triangle to the left
    glRotatef(-10,1,0,0);       // tilted slightly up
    glScalef(-2,2,2);           // reversed in x direction
    // The following is a 3,4,5 triangle in the z=0 plane, with normal
    // sticking out towards the viewer.  
    glBegin(GL_TRIANGLES); {
        glNormal3f(0,0,1);
        glVertex3f(0,0,0);
        glVertex3f(4,0,0);
        glVertex3f(0,3,0);
    }
    glEnd();
    glPopMatrix();    

    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(-5,5.5,-2.5,6,-2.5,2.5);
  twMainInit(); 
  twKeyCallback('1', lightToggle, "Toggle first light");
  twKeyCallback('2', lightToggle, "Toggle second light");
  glutDisplayFunc(display);
  glutMainLoop();
  return 0;
}