use strict;
use warnings;
use SDL;
use SDLx::App; #this is in the github repo.
use SDLx::Surface;
use SDL::Event;
use SDL::Events;

use SDL::Rect;
use SDL::Video;

my $app = SDLx::App->new(
	title  => 'Application Title',
	width  => 640,
	height => 480,
	depth  => 32
);

load_app();

my $surface = load_surface();
my $matrix = SDLx::Surface->new( surface => $surface );

my $event = SDL::Event->new; # create a new event

while (1) {
	SDL::Events::pump_events();

	while ( SDL::Events::poll_event($event) ) {
		my $type = $event->type(); # get event type
		exit if $type == SDL_QUIT;
	}

	update();

	SDL::Video::update_rect( $app, 0, 0, $app->w, $app->h );
}

sub load_app {

	my $mapped_color = SDL::Video::map_RGB( $app->format(), 0, 0, 0 ); # blue

	SDL::Video::fill_rect(
		$app, SDL::Rect->new( 0, 0, $app->w, $app->h ),
		$mapped_color
	);
	return $app;
}

sub load_surface {

	my $surface = SDL::Surface->new( SDL_ANYFORMAT, 150, 150, 32, 0, 0, 0, 0 );
	my $mapped_color = SDL::Video::map_RGB( $surface->format(), 0, 0, 255 ); # blue

	SDL::Video::fill_rect(
		$surface,
		SDL::Rect->new( 0, 0, $surface->w, $surface->h ),
		$mapped_color
	);
	return $surface;
}

sub update {
	load_app();
	SDL::Video::blit_surface(
		$surface,
		SDL::Rect->new( 0, 0, $surface->w, $surface->h ),
		$app,
		SDL::Rect->new(
			( $app->w - $surface->w ) / 2, ( $app->h - $surface->h ) / 2,
			$app->w, $app->h
		)
	);
	SDL::Video::lock_surface($surface);

	foreach ( 0 ... rand( $surface->w ) ) {

		$matrix->[$_][ rand( $surface->h ) ] = int(0xFFFFFFFF / ( $_ + 1 ));

	}
	SDL::Video::unlock_surface($surface);
}