/*
Sarah Abraham
For Library Demo
Metal Gear Rex

11/6/05
#Added bezier surfaces to its feet, making them rounded

11/25/05
#Moved around some of the comments for convenience
#Made the drawRex function take three color values as parameters

Things to do:
Correct the color issue with feet.  Why is it not normalizing properly?

This is based on the mech design Metal Gear Rex from the video
game, Metal Gear Solid.

*/

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

// put in this instead of the code
//#include "sabraham.cc"
// I replace it with
#include <f05/objects.h>

void drawGround(float x1, float x2, float z1, float z2) {
  //This draws the base of the picture
  //normal is on positive y axis
  //x1, and z1 are the lesser values
  //x2, and z2 are the greater values
  glBegin(GL_QUADS);
  glNormal3f(0,1,0);
  glVertex3f(x1,0,z1);
  glVertex3f(x2,0,z1);
  glVertex3f(x2,0,z2);
  glVertex3f(x1,0,z2);
  glEnd();
}

// These need to be in both places, unfortunately

const float rexHeight = 4.5; //on y axis, from leg to head
const float rexWidth = 3.5; //on x axis, from leg to leg
const float rexLength = 5; //on z axis, from front to back

// These should be here, not in sabraham.cc

twTriple mainColor = {0.54,0.52,0.65};
twTriple lightColor = {0.65,0.7,0.69};
twTriple darkColor = {0.46,0.37,0.47};
twTriple darkestColor = {0.25,0.20,0.27};

void display (void) {

  twDisplayInit();
  twCamera();
  
  GLfloat backLight[] = {0,0,-4,1};
  twGrayLight(GL_LIGHT0, backLight,0.4,0.4,0.4);
  glEnable(GL_LIGHTING);

  GLfloat frontLight[] = {1,3,4,1};
  twGrayLight(GL_LIGHT1, frontLight,0.1,0.1,0.1);
  glEnable(GL_LIGHTING);

  glShadeModel(GL_SMOOTH);
  sabrahamRex(mainColor,lightColor,darkColor);
  twColor(darkestColor,0,0);
  drawGround(-rexWidth*0.3,rexWidth*1.3,
             -rexLength*0.9,rexLength*0.9);

  glFlush();
  glutSwapBuffers();
}

int main (int argc, char** argv) {
  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
  twInitWindowSize(500,500);
  // This code needs to be with the object
  // quadric = gluNewQuadric(); //initializes "quadric"
  // gluQuadricNormals(quadric, GLU_SMOOTH); //makes them smooth shaded
  glutCreateWindow(argv[0]);
  glutDisplayFunc(display);
  //bounding box uses approximations
  twBoundingBox(-rexWidth*0.3,rexWidth*1.3,
                0,rexHeight*1.1,
                -rexLength*0.9,rexLength*0.9);
  twMainInit();
  glutMainLoop();
  return 0;
}