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//convert a Uint32Array comprised of tile data where the tiles are written sequentially into an image
function tileBufferToTexture(buffer, t_width, t_height, width, height)
{
  var length = t_width * t_height * width * height;

  var output = new Uint32Array(length);
  for(var i = 0, x = 0, y = 0, t_x = 0, t_y = 0, c = 0, j = 0; i < length; ++i)
  {
    x   = i % t_width
    y   = Math.floor(i / t_width)  % t_height;
    t_x = Math.floor(i / (t_height * t_width)) % width;
    t_y = Math.floor(i / (t_width  * t_height  * width));
    j = (x + y * t_width * width + t_x * t_width + t_y * (t_width * t_height * width));
    output[j] = buffer[i]
  }

  return new Texture(width * t_width, height * t_height, output);
}


//write tile to position target in m_buffer
function setTileInBuffer(t_buffer, m_buffer, t_width, t_height, tile, target)
{
  var t_size = t_width * t_height;
  var m_start = t_size * target;
  var t_start = t_size * tile;
  //note uses a loop for moving the data rather than set and slice intentionally
  //due to large number of times this is called set and slice incur a larger overhead
  //due to related memory management issues
  for(var i = 0; i < t_size; ++ i)
  {
    m_buffer[m_start + i] = t_buffer[t_start + i];
  }
}