#!/usr/bin/env perl
#
# SDL.pm
#
# 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
#

package SDL;

use strict;
use warnings;
use Carp;

use vars qw($VERSION @ISA @EXPORT @EXPORT_OK);

require Exporter;
require DynaLoader;

use SDL_perl;
use SDL::Constants;

BEGIN {
	@ISA = qw(Exporter DynaLoader);
	@EXPORT = qw( in verify &NULL );
};

# Give our caller SDL::Constant's stuff as well as ours.
sub import {
  my $self = shift;

  $self->export_to_level(1, @_);
  SDL::Constants->export_to_level(1);
}

$VERSION = '2.2.1';

print "$VERSION" if (defined($ARGV[0]) && ($ARGV[0] eq '--SDLperl'));

$SDL::DEBUG=1;

sub NULL {
	return 0;
}

sub in {
	my ($k,@t) = @_;
	return 0 unless defined $k;
	my $r = ($k ~~ @t);
	return 0 if $r eq '';
	return $r;

} 

sub verify (\%@) {
	my ($options,@valid_options) = @_;
	for (keys %$options) {
		croak "Invalid option $_\n" unless in ($_, @valid_options);
	}
}


1;
__END__

=head1 NAME

SDL_perl - Simple DirectMedia Layer for Perl

=head1 SYNOPSIS

  use SDL;

=head1 DESCRIPTION

SDL_perl is a package of perl modules that provides both functional and object orient
interfaces to the Simple DirectMedia Layer for Perl 5.  This package does take some
liberties with the SDL API, and attempts to adhere to the spirit of both the SDL
and Perl.  This document describes the low-level functional SDL_perl API.  For the
object oriented programming interface please see the documentation provided on a
per class basis.

=head2 Init(flags) 

As with the C language API, SDL_perl initializes the SDL environment through
the C<SDL::Init> subroutine.  This routine takes a mode flag constructed through
the bitwise OR product of the following functions:  

=over 4
=item *
INIT_AUDIO()

=item *
INIT_VIDEO()

=item *
INIT_CDROM()

=item *
INIT_EVERYTHING()

=item *
INIT_NOPARACHUTE() 

=item *
INIT_JOYSTICK()

=item *
INIT_TIMER()

=back

C<SDL::Init> returns 0 on success, or -1 on error.

=head2 GetError()

The last error message set by the SDL library can be retrieved using the subroutine
C<SDL::GetError>, which returns a scalar containing the text of the message if any.

=head2 Delay(ms)

This subroutine allows an application to delay further operations for atleast a
number of milliseconds provided as the argument.  The actual delay may be longer
than the specified depending on the underlying OS.

=head2 GetTicks() 

An application may retrieve the number of milliseconds expired since the initilization
of the application through this subroutine.  This value resets rougly ever 49 days.

=head2 AddTimer(interval,callback,param)

C<AddTimer> will register a SDL_NewTimerCallback function to be executed after
C<interval> milliseconds, with parameter C<param>.  SDL_NewTimerCallback objects
can be constructed with the C<NewTimer> subroutine.   C<SDL::PerlTimerCallback>
will return a valid callback for executing a perl subroutine or closure.
This subroutine returns a SDL_TimerID for the newly registered callback, or NULL 
on error.

=head2 NewTimer(interval,subroutine)

The C<NewTimer> takes an interval in milliseconds and a reference to a subroutine
to call at that interval.  The subroutine will be invoked in a void context
and accepts no parameters.  The callback used is that returned by C<SDL::PerlTimerCallback>.
C<NewTimer> returns the SDL_TimerID for the new timer or NULL on error.

=head2 RemoveTimer(id)

This subroutine taks a SDL_TimerID and removes it from the list of active callbacks.
RemoveTimer returns false on failure.

=head2 SetTimer 

This subroutine is depreciated, please use C<NewTimer> or C<AddTimer> instead.

=head2 CDNumDrives() 

C<SDL::CDNumDrives> returns the number of available CD-ROM drives in the system.

=head2 CDName(drive)

The subroutine C<SDL::CDName> returns the system specific human readable device name
for the given CD-ROM drive.

=head2 CDOpen(drive)

This subroutine opens a CD-ROM drive for access, returning NULL if the drive is busy 
or otherwise unavailable.  On success this subroutine returns a handle to the CD-ROM
drive.

=head2 CDTrackListing(cd)

C<SDL::CDTrackListing> returns a human readable description of a CD-ROM.  For each
track one line will be produced with the following format:

	Track index: %d, id %d, %2d.%2d 

This is provided to ease the creation of human readable descriptions and debugging.

=head2 CDTrackId(track) 

C<CDTrackId> returns the id field of the given SDL_CDtrack structure.

=head2 CDTrackType(track)

C<CDTrackType> returns the type field of the given SDL_CDtrack structure.

=head2 CDTrackLength(track)

C<CDTrackLength> returns the length field of the given SDL_CDtrack structure.

=head2 CDTrackOffset(track)

C<CDTrackOffset> returns the offset field of the given SDL_CDtrack structure.

=head2 CDStatus(cd)

The function C<CDStatus> returns the current status of the given SDL_CDrom.
C<CDStatus>'s return values are:

=over 4

=item *
CD_TRAYEMPTY 

=item *
CD_PLAYING 

=item *
CD_STOPPED

=item *
CD_PAUSED 

=item *
CD_ERROR 

=back

=head2 CDPlayTracks(cd,track,tracks,frame,frames)

To start playing from an arbitrary portion of a CD, one can provide
C<SDL::CDPlayTracks> with a CD, a starting track, the number of tracks,
a starting frame, and the number of frames to be played. 

=head2 CDPlay(cd,track,length) 

C<SDL::CDPlay> plays the next C<length> tracks starting from C<track>

=head2 CDPause(cd) 

This function will pause CD playback until resume is called.

=head2 CDResume(cd) 

This function will resume CD playback if paused.

=head2 CDStop(cd) 

C<SDL::CDStop> will stop CD playback if playing.

=head2 CDEject(cd) 

This function will eject the CD

=head2 CDClose(cd) 

This function will release an opened CD. 

=head2 CDNumTracks 

=head2 CDCurTrack 

=head2 CDCurFrame 

=head2 CDTrack 

=head2 PumpEvents 

=head2 NewEvent 

=head2 FreeEvent

=head2 PollEvent 

=head2 WaitEvent 

=head2 EventState 

=head2 IGNORE 

=head2 ENABLE 

=head2 QUERY 

=head2 ACTIVEEVENT

=head2 KEYDOWN 

=head2 KEYUP 

=head2 MOUSEMOTION 

=head2 MOUSEBUTTONDOWN 

=head2 MOUSEBUTTONUP 

=head2 QUIT 

=head2 SYSWMEVENT 

=head2 EventType 

=head2 ActiveEventGain 

=head2 ActiveEventState 

=head2 APPMOUSEFOCUS 

=head2 APPINPUTFOCUS 

=head2 APPACTIVE 

=head2 KeyEventState

=head2 SDLK_BACKSPACE 

=head2 SDLK_TAB 

=head2 SDLK_CLEAR 

=head2 SDLK_RETURN 

=head2 SDLK_PAUSE 

=head2 SDLK_ESCAPE 

=head2 SDLK_SPACE 

=head2 SDLK_EXCLAIM 

=head2 SDLK_QUOTEDBL 

=head2 SDLK_HASH 

=head2 SDLK_DOLLAR 

=head2 SDLK_AMPERSAND 

=head2 SDLK_QUOTE 

=head2 SDLK_LEFTPAREN 

=head2 SDLK_RIGHTPAREN 

=head2 SDLK_ASTERISK 

=head2 SDLK_PLUS 

=head2 SDLK_COMMA 

=head2 SDLK_MINUS 

=head2 SDLK_PERIOD 

=head2 SDLK_SLASH 

=head2 SDLK_0 

=head2 SDLK_1 

=head2 SDLK_2 

=head2 SDLK_3 

=head2 SDLK_4 

=head2 SDLK_5 

=head2 SDLK_6 

=head2 SDLK_7 

=head2 SDLK_8 

=head2 SDLK_9 

=head2 SDLK_COLON 

=head2 SDLK_SEMICOLON 

=head2 SDLK_LESS 

=head2 SDLK_EQUALS 

=head2 SDLK_GREATER 

=head2 SDLK_QUESTION 

=head2 SDLK_AT 

=head2 SDLK_LEFTBRACKET 

=head2 SDLK_BACKSLASH 

=head2 SDLK_RIGHTBRACKET 

=head2 SDLK_CARET 

=head2 SDLK_UNDERSCORE 

=head2 SDLK_BACKQUOTE 

=head2 SDLK_a 

=head2 SDLK_b 

=head2 SDLK_c 

=head2 SDLK_d 

=head2 SDLK_e 

=head2 SDLK_f 

=head2 SDLK_g 

=head2 SDLK_h 

=head2 SDLK_i 

=head2 SDLK_j 

=head2 SDLK_k 

=head2 SDLK_l 

=head2 SDLK_m 

=head2 SDLK_n 

=head2 SDLK_o 

=head2 SDLK_p 

=head2 SDLK_q 

=head2 SDLK_r 

=head2 SDLK_s 

=head2 SDLK_t 

=head2 SDLK_u 

=head2 SDLK_v 

=head2 SDLK_w 

=head2 SDLK_x 

=head2 SDLK_y 

=head2 SDLK_z 

=head2 SDLK_DELETE 

=head2 SDLK_KP0 

=head2 SDLK_KP1 

=head2 SDLK_KP2 

=head2 SDLK_KP3 

=head2 SDLK_KP4 

=head2 SDLK_KP5 

=head2 SDLK_KP6 

=head2 SDLK_KP7 

=head2 SDLK_KP8 

=head2 SDLK_KP9 

=head2 SDLK_KP_PERIOD 

=head2 SDLK_KP_DIVIDE 

=head2 SDLK_KP_MULTIPLY 

=head2 SDLK_KP_MINUS 

=head2 SDLK_KP_PLUS 

=head2 SDLK_KP_ENTER 

=head2 SDLK_KP_EQUALS 

=head2 SDLK_UP 

=head2 SDLK_DOWN 

=head2 SDLK_RIGHT 

=head2 SDLK_LEFT 

=head2 SDLK_INSERT 

=head2 SDLK_HOME 

=head2 SDLK_END 

=head2 SDLK_PAGEUP 

=head2 SDLK_PAGEDOWN 

=head2 SDLK_F1 

=head2 SDLK_F2 

=head2 SDLK_F3 

=head2 SDLK_F4 

=head2 SDLK_F5 

=head2 SDLK_F6 

=head2 SDLK_F7 

=head2 SDLK_F8 

=head2 SDLK_F9 

=head2 SDLK_F10 

=head2 SDLK_F11 

=head2 SDLK_F12 

=head2 SDLK_F13 

=head2 SDLK_F14 

=head2 SDLK_F15 

=head2 SDLK_NUMLOCK 

=head2 SDLK_CAPSLOCK 

=head2 SDLK_SCROLLOCK 

=head2 SDLK_RSHIFT 

=head2 SDLK_LSHIFT 

=head2 SDLK_RCTRL 

=head2 SDLK_LCTRL 

=head2 SDLK_RALT 

=head2 SDLK_LALT 

=head2 SDLK_RMETA 

=head2 SDLK_LMETA 

=head2 SDLK_LSUPER 

=head2 SDLK_RSUPER 

=head2 SDLK_MODE 

=head2 SDLK_HELP 

=head2 SDLK_PRINT 

=head2 SDLK_SYSREQ 

=head2 SDLK_BREAK 

=head2 SDLK_MENU 

=head2 SDLK_POWER 

=head2 SDLK_EURO 

=head2 KMOD_NONE 

=head2 KMOD_NUM 

=head2 KMOD_CAPS 

=head2 KMOD_LCTRL 

=head2 KMOD_RCTRL 

=head2 KMOD_RSHIFT 

=head2 KMOD_LSHIFT 

=head2 KMOD_RALT 

=head2 KMOD_LALT 

=head2 KMOD_CTRL 

=head2 KMOD_SHIFT 

=head2 KMOD_ALT 

=head2 KeyEventSym 

=head2 KeyEventMod 

=head2 KeyEventUnicode 

=head2 KeyEventScanCode 

=head2 MouseMotionState 

=head2 MouseMotionX 

=head2 MouseMotionY 

=head2 MouseMotionXrel

=head2 MouseMotionYrel 

=head2 MouseButtonState 

=head2 MouseButton 

=head2 MouseButtonX 

=head2 MouseButtonY 

=head2 SysWMEventMsg 

=head2 EnableUnicode 

=head2 EnableKeyRepeat 

=head2 GetKeyName 

=head2 PRESSED 

=head2 RELEASED 

=head2 CreateRGBSurface 

=head2 CreateRGBSurfaceFrom 

=head2 IMG_Load 

=head2 FreeSurface 

=head2 SurfacePalette 

=head2 SurfaceBitsPerPixel 

=head2 SurfaceBytesPerPixel 

=head2 SurfaceRshift 

=head2 SurfaceGshift 

=head2 SurfaceBshift 

=head2 SurfaceAshift 

=head2 SurfaceRmask

=head2 SurfaceGmask 

=head2 SurfaceBmask 

=head2 SurfaceAmask 

=head2 SurfaceColorKey 

=head2 SurfaceAlpha

=head2 SurfaceW 

=head2 SurfaceH 

=head2 SurfacePitch 

=head2 SurfacePixels 

=head2 SurfacePixel 

=head2 MUSTLOCK 

=head2 SurfaceLock 

=head2 SurfaceUnlock 

=head2 GetVideoSurface 

=head2 VideoInfo 

=head2 NewRect 

=head2 FreeRect 

=head2 RectX 

=head2 RectY 

=head2 RectW 

=head2 RectH 

=head2 NewColor 

=head2 ColorR 

=head2 ColorG 

=head2 CologB 

=head2 FreeColor 

=head2 NewPalette 

=head2 PaletteNColors 

=head2 PaletteColors 

=head2 SWSURFACE 

=head2 HWSURFACE 

=head2 ANYFORMAT 

=head2 HWPALETTE 

=head2 DOUBLEBUF 

=head2 FULLSCREEN 

=head2 ASYNCBLIT 

=head2 OPENGL 

=head2 HWACCEL 

=head2 VideoModeOK 

=head2 SetVideoMode 

=head2 UpdateRects 

=head2 Flip 

=head2 SetColors 

=head2 MapRGB (surface,r,g,b)

C<SDL::MapRGB> translates the composite red (r), green (g), blue (b)
colors according to the given surface to a interger color value.  This
integer can be used in functions like C<SDL::FillRect>, and is not
the same as the format independent Color object returned by C<SDL::NewColor>.

=head2 MapRGBA (surface,r,g,b,a)

C<SDL::MapRGBA> works as C<SDL::MapRGB> but takes an additional alpha (a)
component for semi-transperant colors.

=head2 GetRGB 

=head2 GetRGBA 

=head2 SaveBMP 

=head2 SetColorKey 

=head2 SRCCOLORKEY 

=head2 RLEACCEL 

=head2 SRCALPHA 

=head2 SetAlpha 

=head2 DisplayFormat 

=head2 BlitSurface 

=head2 FillRect(surface,rect,color)
	
C<SDL::FillRect> draws a solid rectangle of color on the given surface.
If the rectangle is NULL, the entire surface will be painted.

=head2 WMSetCaption 

=head2 WMGetCaption 

=head2 WMSetIcon 

=head2 WarpMouse 

=head2 NewCursor 

=head2 FreeCursor 

=head2 SetCursor 

=head2 GetCursor 

=head2 ShowCursor 

=head2 NewAudioSpec 

=head2 FreeAudioSpec 

=head2 AUDIO_U8 

=head2 AUDIO_S8 

=head2 AUDIO_U16 

=head2 AUDIO_S16 

=head2 AUDIO_U16MSB 

=head2 AUDIO_S16MSB 

=head2 NewAudioCVT 

=head2 FreeAudioCVT 

=head2 ConvertAudioData 

=head2 OpenAudio 

=head2 PauseAudio 

=head2 UnlockAudio 

=head2 CloseAudio 

=head2 FreeWAV 

=head2 LoadWAV 

=head2 MixAudio 

=head2 MIX_MAX_VOLUME 

=head2 MIX_DEFAULT_FREQUENCY 

=head2 MIX_DEFAULT_FORMAT 

=head2 MIX_DEFAULT_CHANNELS 

=head2 MIX_NO_FADING 

=head2 MIX_FADING_OUT 

=head2 MIX_FADING_IN 

=head2 MixOpenAudio 

=head2 MixAllocateChannels 

=head2 MixQuerySpec 

=head2 MixLoadWAV 

=head2 MixLoadMusic 

=head2 MixQuickLoadWAV 

=head2 MixFreeChunk

=head2 MixFreeMusic 

=head2 MixSetPostMixCallback 

=head2 MixSetMusicHook 

=head2 MixSetMusicFinishedHook 

=head2 MixGetMusicHookData 

=head2 MixReverseChannels 

=head2 MixGroupChannel 

=head2 MixGroupChannels 

=head2 MixGroupAvailable 

=head2 MixGroupCount 

=head2 MixGroupOldest 

=head2 MixGroupNewer 

=head2 MixPlayChannel 

=head2 MixPlayChannelTimed 

=head2 MixPlayMusic 

=head2 MixFadeInChannel 

=head2 MixFadeInChannelTimed 

=head2 MixFadeInMusic 

=head2 MixVolume 

=head2 MixVolumeChunk 

=head2 MixVolumeMusic 

=head2 MixHaltChannel 

=head2 MixHaltGroup 

=head2 MixHaltMusic 

=head2 MixExpireChannel 

=head2 MixFadeOutChannel 

=head2 MixFadeOutGroup 

=head2 MixFadeOutMusic 

=head2 MixFadingMusic

=head2 MixFadingChannel

=head2 MixPause 

=head2 MixResume 

=head2 MixPaused 

=head2 MixPauseMusic 

=head2 MixResumeMusic 

=head2 MixRewindMusic 

=head2 MixPausedMusic 

=head2 MixPlaying

=head2 MixPlayingMusic

=head2 MixCloseAudio 

=head2 NewFont 

=head2 UseFont 

=head2 PutString 

=head2 TextWidth 

=head2 GL_RED_SIZE 

=head2 GL_GREEN_SIZE 

=head2 GL_BLUE_SIZE 

=head2 GL_ALPHA_SIZE 

=head2 GL_ACCUM_RED_SIZE 

=head2 GL_ACCUM_GREEN_SIZE 

=head2 GL_ACCUM_BLUE_SIZE 

=head2 GL_ACCUM_ALPHA_SIZE 

=head2 GL_BUFFER_SIZE 

=head2 GL_DEPTH_SIZE 

=head2 GL_STENCIL_SIZE 

=head2 GL_DOUBLEBUFFER 

=head2 GL_SetAttribute 

=head2 GL_GetAttribute 

=head2 GL_SwapBuffers 

=head2 BigEndian 

=head2 NumJoysticks 

=head2 JoystickName 

=head2 JoystickOpen 

=head2 JoystickOpened 

=head2 JoystickIndex 

=head2 JoystickNumAxes 

=head2 JoystickNumBalls 

=head2 JoystickNumHats 

=head2 JoystickNumButtons 

=head2 JoystickUpdate 

=head2 JoystickGetAxis 

=head2 JoystickGetHat 

=head2 JoystickGetButton 

=head2 JoystickGetBall 

=head2 JoystickClose 

=head1 AUTHOR

David J. Goehrig

=head1 CONTRIBUTORS

David J. Goehrig, Wayne Keenan, Guillaume Cottenceau

=head1 SEE ALSO

	perl(1) SDL::App(3) SDL::Surface(3) SDL::Event(3) SDL::Rect(3) 
	SDL::Palette(3) SDL::Mixer(3) SDL::Cdrom(3)

=cut

