int baseUnit = 4;
int [][] grid;
PFont font;
void setup(){
  size(550,400,P3D);
  font = loadFont("BitstreamVeraSans-Roman-48.vlw");
  textFont(font,12);
  grid = new int[2][];
  grid[0] = new int[int(pow(baseUnit,2))];
  grid[1] = new int[int(pow(baseUnit,4))];
  for(int j = 0; j < grid[0].length; j++){
    grid[0][j] = 0;
  }
  for(int j = 0; j < grid[1].length; j++){
    grid[1][j] = int(random(4));
  }

}
void draw(){
  background(50);
  drawGrid(0,50,50,100,100);
  drawGrid(1,200,50,300,300);
}
void mousePressed(){
  upload(0);
}  
void upload(int i){
  int baseLength = int(sqrt(grid[i].length));
  int sourceLength = int(sqrt(grid[i+1].length));
  for (int j = 0; j < grid[i].length; j++){
    int sourceStart = ((j % baseLength) * baseLength) + (((j / baseLength) * baseLength) * sourceLength);
    int sourceEnd = sourceStart+(sourceLength*baseLength);
    for (int k = sourceStart; k < sourceEnd; k += sourceLength){
	for (int m = 0; m < baseLength; m++){
	  println(k+m);
	  grid[i][j] += grid[i+1][k+m];
	}
    }
    println("coda");
  }
}
void drawGrid(int gridNumber, float x, float y, float w, float h){
  int sideLength = int(sqrt(grid[gridNumber].length));
  float xStep = w/sideLength;
  float yStep = h/sideLength;
  for(int i = 0; i < sideLength; i++){
    for(int j = 0; j < sideLength; j++){
	text(grid[gridNumber][i+j*sideLength],x+(xStep*i),y+(yStep*j));
    }
  }
}