boolean newFrame = false;
int xm = 176;
int ym = 144;
int zm = 50;
boolean col = true;
int con = 3;
BImage swap;
BImage a;
void setup()  {
  size (800,600);
  /*
  try{
    quicktime.QTSession.open();
    quicktime.std.sg.SequenceGrabber sg = new quicktime.std.sg.SequenceGrabber();
    quicktime.std.sg.SGVideoChannel sc  = new quicktime.std.sg.SGVideoChannel(sg);
    quicktime.std.sg.VideoDigitizer vd  = sc.getDigitizerComponent();
    println( "dv.getNumberOfInputs :" ); println( vd.getNumberOfInputs() ); println();
    vd.setInput(2);
  } catch (Exception e) {
    e.printStackTrace();
  }
  */
  beginVideo(xm, ym, 12);
  //a = loadImage("c.gif");
  //swap = a;
}
void videoEvent() {
  newFrame = true;
}
void loop()  {  
  if(newFrame) {
    newFrame = false;
    swap = video;
  } 
  background(255);
  push();
  translate(width/2,height/2,300);
  rotateY((TWO_PI/width)*mouseX);
  rotateX((TWO_PI/width)*mouseY);
  //rotateX(PI);
  drawCube();
  cubeBrown();
  pop();
}

void mousePressed(){
  col = !col;
}
void keyPressed(){
  con = (con+1)%5;
}
void cubeBrown(){
  strokeWeight(1);
  stroke(15,15,15,100);
  line(-(xm/2),-(ym/2),-(zm/2),(xm/2),-(ym/2),-(zm/2));
  line(-(xm/2),-(ym/2),-(zm/2),-(xm/2),(ym/2),-(zm/2));
  line(-(xm/2),-(ym/2),-(zm/2),-(xm/2),-(ym/2),(zm/2));
  line((xm/2),-(ym/2),-(zm/2),(xm/2),(ym/2),-(zm/2));
  line((xm/2),-(ym/2),-(zm/2),(xm/2),-(ym/2),(zm/2));
  line(-(xm/2),(ym/2),-(zm/2),(xm/2),(ym/2),-(zm/2));
  line(-(xm/2),-(ym/2),(zm/2),(xm/2),-(ym/2),(zm/2));
  line(-(xm/2),-(ym/2),(zm/2),-(xm/2),(ym/2),(zm/2));
  line(-(xm/2),(ym/2),(zm/2),(xm/2),(ym/2),(zm/2));
  line(-(xm/2),(ym/2),(zm/2),-(xm/2),(ym/2),-(zm/2));
  line((xm/2),(ym/2),(zm/2),(xm/2),(ym/2),-(zm/2));
  line((xm/2),(ym/2),(zm/2),(xm/2),-(ym/2),(zm/2));
}
void drawCube(){
  for (int ix = 1; ix < xm-1; ix++){
    for (int iy = 1; iy < ym-1; iy++){
      float zee = zm;
      int c1 = int((zee/255.0)*grey(swap.pixels[ix + iy*xm]));
      int c2 = int((zee/255.0)*grey(swap.pixels[ix + 1 + iy*xm]));
      int c3 = int((zee/255.0)*grey(swap.pixels[ix + (iy + 1)*xm]));
      int c4 = int((zee/255.0)*grey(swap.pixels[ix + 1 + (iy + 1)*xm]));
      if (col){
        stroke(swap.pixels[ix + iy*xm]);
      }else{
        stroke(grey(swap.pixels[ix + iy*xm]));
      }
      switch(con){
        case 0:
        strokeWeight(3);
        point(ix-(xm/2),iy-(ym/2),c1-(zm/2));break;
        case 1:
        line(ix-(xm/2),iy-(ym/2),c1-(zm/2), ix-(xm/2)+1,iy-(ym/2),c2-(zm/2)); break;
        case 2:
        line(ix-(xm/2),iy-(ym/2),c1-(zm/2), ix-(xm/2)+1,iy-(ym/2),c2-(zm/2));
        line(ix-(xm/2),iy-(ym/2),c1-(zm/2), ix-(xm/2),iy-(ym/2)+1,c3-(zm/2));break;
        case 3:
        noStroke();
        if (col){
          fill(swap.pixels[ix + iy*xm]);
        }else{
          fill(grey(swap.pixels[ix + iy*xm]));
        }
        beginShape(QUADS);
        vertex(ix-(xm/2),iy-(ym/2),c1-(zm/2));
        vertex((ix+1)-(xm/2),iy-(ym/2),c2-(zm/2));
        vertex((ix+1)-(xm/2),(iy+1)-(ym/2),c4-(zm/2));
        vertex(ix-(xm/2),(iy+1)-(ym/2),c3-(zm/2));
        endShape();break;
      }
    }
  }
  if (con==4){
    noStroke();
    fill(255);
    beginShape(QUADS);
    texture(swap);
    vertex(-(xm/2),-(ym/2),0,  0,0);
    vertex((xm/2),-(ym/2),0,  176,0);
    vertex((xm/2),(ym/2),0,  176,144);
    vertex(-(xm/2),(ym/2),0,  0,144);
    endShape();
  }
}
float grey(color p){
  float r = red(p);
  float g = green(p);
  float b = blue(p);
  return (r+g+b)/3;
}