use strict;
use warnings;
use Benchmark qw(cmpthese);

use constant type => 0;

cmpthese (-1, {
    org => 'org ()',
    gf => 'gf ()',
});


sub org {
    my $bz = 0;
    my $bx = 0;
    my $by = 0;
    my $changed;
    my @tiles;
    my @type_data;
    
    for my $y (0 .. 15) {
        for my $x (0 .. 15) {
            # this calculates the tile index we are currently at,
            # using the x and y coords in this block
            my $tile_index = $y + ($x * 16);
    
            # this calculates the real x and y values of this tile
            my $rx = ($bx * 16) + $x;
            my $ry = ($by * 16) + $y;
    
            # insert type data into the internal map array and
            # note that there was change in this block if applicable
            if (!defined $tiles[$rx][$ry][$bz][type]
                || $tiles[$rx][$ry][$bz][type] != $type_data[$tile_index])
            {
                $changed = 1;
                $tiles[$rx][$ry][$bz][type] = $type_data[$tile_index];
            }
        }
    }
}

sub gf {
    my $bz = 0;
    my $bx = 0;
    my $by = 0;
    my $changed;
    my @tiles;
    my @type_data;
    my $bxScaled = $bx * 16;
    my $byScaled = $by * 16;
    
    for my $x (0 .. 15) {
        my $xScaled = 16 * $x;
        
        for my $y (0 .. 15) {
            # this calculates the tile index we are currently at,
            # using the x and y coords in this block
            my $tile_index = $y + $xScaled;
    
            # this calculates the real x and y values of this tile
            my $rx = $bxScaled + $x;
            my $ry = $byScaled + $y;
    
            # insert type data into the internal map array and
            # note that there was change in this block if applicable
            my $tile = $tiles[$rx][$ry][$bz][type];
            if (!defined $tile || $$tile != $type_data[$tile_index])
            {
                $changed = 1;
                $$tile = $type_data[$tile_index];
            }
        }
    }
}

__END__
      Rate  org   gf
org 1372/s   -- -29%
gf  1939/s  41%   --