// ZBuffer.pde (part of IsoBlox)
// Dave Bollinger, Sep 2006
// http://www.davebollinger.com
// for Processing 0115 Beta
// (updated 08/16/2006 for 0125 Beta)

public class ZBuffer {
  static final int MINZ = -999999;
  static final int MAXZ =  999999;
  int [][] z;
  int width, height;
  ZBuffer(int w, int h) {
    width = w;
    height = h;
    z = new int[height][width];
    clear();
  }
  public void clear() {
    for (int y=0; y<height; y++)
      for (int x=0; x<width; x++)
        z[y][x] = MINZ;
  }
  public int get(int x, int y) {
    if ((x<0) || (y<0) || (x>=width) || (y>=height)) return MAXZ;
    return z[y][x];
  }
  public boolean set(int x, int y, int newz) {
    if ((x<0) || (y<0) || (x>=width) || (y>=height)) return false;
    if (newz > z[y][x]) {
      z[y][x] = newz;
      return true;
    }
    return false;
  }
}