#!/usr/bin/env perl
#
# testsprite.pl
#
# Copyright (C) 2005 David J. Goehrig <dgoehrig@cpan.org>
#
# ------------------------------------------------------------------------------
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
# 
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
# 
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
#
# ------------------------------------------------------------------------------
#
# Please feel free to send questions, suggestions or improvements to:
#
#	David J. Goehrig
#	dgoehrig@cpan.org
#

use strict;
use Data::Dumper;
use MIME::Base64 qw(decode_base64);

use SDL;
use SDL::App;
use SDL::Event;
use SDL::Surface;
use SDL::Color;
use SDL::Rect;

use vars qw/ $app $app_rect $background $event $sprite $sprite_rect $videoflags /;

## User tweakable settings (via cmd-line)
my %settings = (
	'numsprites'    => 75,
	'screen_width'  => 640,
	'screen_height' => 480,
	'video_bpp'     => 8,
	'fast'          => 0,
	'hw'            => 0,
	'flip'          => 1,
	'fullscreen'    => 0,
	'bpp'           => undef,
);

## Initialize application options

sub set_app_args
{
  $settings{bpp} ||= 8;  	# default to 8 bits per pix
  $videoflags |= SDL_HWACCEL     if $settings{hw};  
  $videoflags |= SDL_DOUBLEBUF   if $settings{flip};  
  $videoflags |= SDL_FULLSCREEN  if $settings{fullscreen}; 
}

## Setup 

our $bmp;

sub  init_game_context
{
  write_bmp();
  $app = new SDL::App (
		       -width => $settings{screen_width}, 
		       -height=> $settings{screen_height}, 
		       -title => "testsprite",
		       -icon  => "/tmp/icon.bmp",
		       -flags => $videoflags,
			);

  $app_rect= new SDL::Rect(
			   -height => $settings{screen_height}, 
			   -width  => $settings{screen_width},
			  );

  $background = $SDL::Color::black;

  $sprite = new SDL::Surface(-name => '/tmp/icon.bmp');

  # Set transparent pixel as the pixel at (0,0) 
  
  $sprite->display_format();

  $sprite->set_color_key(SDL_SRCCOLORKEY,$sprite->pixel(0,0));	# sets the transparent color to that at (0,0)


  $sprite_rect = new SDL::Rect(-x     => 0, 
			       -y     => 0,
			       -width => $sprite->width,
			       -height=> $sprite->height,
			      );
  
  $event = new SDL::Event();
}

## Prints diagnostics

sub instruments
{
  if ( ($app->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
    printf("Screen is in video memory\n");
  } else {
    printf("Screen is in system memory\n");
  }

  if ( ($app->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {
    printf("Screen has double-buffering enabled\n");
  }

  if ( ($sprite->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
    printf("Sprite is in video memory\n");
  } else {
    printf("Sprite is in system memory\n");
  }
  
  # Run a sample blit to trigger blit (if posssible)
  # acceleration before the check just after 
  put_sprite(0,0);
  
  if ( ($sprite->flags & SDL_HWACCEL) == SDL_HWACCEL ) {
    printf("Sprite blit uses hardware acceleration\n");
  }
  if ( ($sprite->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
    printf("Sprite blit uses RLE acceleration\n");
  }
  
}




sub put_sprite
{
  my ($x,$y) = @_;

  my $dest_rect = new SDL::Rect(-x => $x,
			       -y => $y,
			       -width  => $sprite->width,
			       -height => $sprite->height,
			      );
  $sprite->blit($sprite_rect, $app, $dest_rect);  
}



sub game_loop
{
  my $x=0;
  my $y=$settings{screen_height}>>1;
  my $i=0;

  while (1) 
  {
    # process event queue
    $event->pump;
    $event->poll;
    my $etype=$event->type;      

    # handle user events
    last if ($etype eq SDL_QUIT );
    last if (SDL::GetKeyState(SDLK_ESCAPE));

    #$app->lock() if $app->lockp();  

    # page flip

    # __draw gfx
    
    $app->fill($app_rect, $background);

    foreach (1..$settings{numsprites})
    {
      put_sprite( $_*8, $y + (sin(($i+$_)*0.2)*($settings{screen_height}/3)));
    }
    $i+=30;

    # __graw gfx end
    #$app->unlock();
    $app->flip if $settings{flip};
  }
}

## Main program loop

set_app_args();
init_game_context();
instruments();
game_loop();
system 'rm /tmp/icon.bmp';
exit(0);


sub write_bmp {
	$bmp = decode_base64 <<EOF;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EOF
	open FP, "> /tmp/icon.bmp";
	print FP $bmp;
	close FP;
}