/* Mala Sarkar
   CS307 Fall 2005
   Demo of Pillow

   This doesn't actually use a library object, but it might become one someday.

*/

#include <stdio.h>
#include <math.h>
#include <tw.h> 
//#include "msarkar.cc"


//default color for pillow
twTriple duskyLavender = {0.73,0.67,0.75}; 

bool Wire = false; 
float s = 5; 

GLfloat pillowFront[12][3] = {

 {s,-s,0},      
  {s,0,0},   
  {s,s,0},  
   

  {0,-s,0},         
  {0,0,1.75*s},      
  {0,s,0}, 

     {-s,-s,0},  
  {-s,0,0},     
  {-s,s,0}, 
 
  
};

GLfloat pillowBack[12][3] = {


    {s,-s,0},      
  {s,0,0},   
  {s,s,0},   


  {0,-s,0},         
  {0,0,-1.75*s},      
  {0,s,0},  
 
{-s,-s,0},  
  {-s,0,0},     
  {-s,s,0},  

  
  
};

// This draws the whole surface, using a mesh with `nsteps' in each direction
void draw_bezier_surface(int nsteps, GLfloat* control_points) {
  glEnable(GL_AUTO_NORMAL);        // automatically compute the normals 

  glMap2f(GL_MAP2_VERTEX_3, 0,1,3,3, 0,1,9,3, control_points);
  glEnable(GL_MAP2_VERTEX_3);
  
  // set up grid and generate the desired surface
  glMapGrid2f(nsteps, 0, 1, nsteps, 0, 1);
  
  glEnable(GL_NORMALIZE);
  
  if(Wire) 
    glEvalMesh2(GL_LINE, 0, nsteps, 0, nsteps);
  else
    glEvalMesh2(GL_FILL, 0, nsteps, 0, nsteps);
  }

void pillowMaterial() {
  glShadeModel(GL_SMOOTH);   
  GLfloat ambient[]  = { 155/255.0, 155/255.0, 255/255.0, 0 };
  GLfloat diffuse[] = {0.2,0.3,0.1,0};
  
  glMaterialfv(GL_FRONT, GL_AMBIENT, ambient);
  glMaterialfv(GL_FRONT, GL_DIFFUSE, diffuse);
}

void drawPillow(twTriple pillowColor) {
  glPushMatrix();
  glShadeModel(GL_SMOOTH); 
  twColor(pillowColor,0,0); 
  pillowMaterial(); 
  draw_bezier_surface(10,pillowBack[0]);
  draw_bezier_surface(10,pillowFront[0]);

  glPopMatrix();
}

void setLight () {
  glEnable(GL_LIGHTING);
  //directional light
  GLfloat light0[4]={1,1,1,0}; 	 
  twGrayLight(GL_LIGHT0,light0 ,0.2,0.6, 0.3);
}

void display(void) {
  twDisplayInit(); 
  twCamera(); //set up camera based on bounding box coordinates
  setLight();

  //draw pillow
  drawPillow(duskyLavender); 

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

int main(int argc, char** argv) {  
  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
  twInitWindowSize(650,650);
  glutCreateWindow(argv[0]);
  glutDisplayFunc(display);
  //create a bounding box tailored to fit the pillow dimensions
  twBoundingBox(-s,s,-s,s,-0.45*s,0.45*s); 
  twMainInit(); 
  glutMainLoop();
  return 0;
}