/*
Copyright (C) 1994-1995 Apogee Software, Ltd.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

Modifications for JonoF's port by Jonathon Fowler (jonof@edgenetwk.com)
*/
/**********************************************************************
   module: MUSIC.C

   author: James R. Dose
   date:   March 25, 1994

   Device independant music playback routines.

   (c) Copyright 1994 James R. Dose.  All Rights Reserved.
**********************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include "music.h"
#include "midi.h"
#include "mpu401.h"

#define TRUE  ( 1 == 1 )
#define FALSE ( !TRUE )

#ifdef __MINGW32__
#define max(a,b) (((a)>(b))?(a):(b))
#define min(a,b) (((a)<(b))?(a):(b))
#endif

int MUSIC_SoundDevice = -1;
int MUSIC_ErrorCode = MUSIC_Ok;

static midifuncs MUSIC_MidiFunctions;

static int       MUSIC_FadeLength;
static int       MUSIC_FadeRate;
static unsigned  MUSIC_CurrentFadeVolume;
static unsigned  MUSIC_LastFadeVolume;
static int       MUSIC_EndingFadeVolume;

int MUSIC_InitMidi( int card, midifuncs *Funcs, int Address );

#define MUSIC_SetErrorCode( status ) \
   MUSIC_ErrorCode = ( status );

/*---------------------------------------------------------------------
   Function: MUSIC_ErrorString

   Returns a pointer to the error message associated with an error
   number.  A -1 returns a pointer the current error.
---------------------------------------------------------------------*/

char *MUSIC_ErrorString
   (
   int ErrorNumber
   )

   {
   char *ErrorString;

   switch( ErrorNumber )
      {
      case MUSIC_Warning :
      case MUSIC_Error :
         ErrorString = MUSIC_ErrorString( MUSIC_ErrorCode );
         break;

      case MUSIC_Ok :
         ErrorString = "Music ok.";
         break;

      case MUSIC_ASSVersion :
         ErrorString = "Apogee Sound System Version WinMM  "
            "Programmed by Jim Dose, Ported by Jonathon Fowler\n"
            "(c) Copyright 1996 James R. Dose.  All Rights Reserved.\n";
         break;

      case MUSIC_SoundCardError :
      case MUSIC_MPU401Error :
         ErrorString = "Could not detect MPU-401.";
         break;

      case MUSIC_InvalidCard :
         ErrorString = "Invalid Music device.";
         break;

      case MUSIC_MidiError :
         ErrorString = "Error playing MIDI file.";
         break;

      case MUSIC_TaskManError :
         ErrorString = "TaskMan error.";
         break;

      case MUSIC_DPMI_Error :
         ErrorString = "DPMI Error in MUSIC.";
         break;

      default :
         ErrorString = "Unknown Music error code.";
         break;
      }

   return( ErrorString );
   }


/*---------------------------------------------------------------------
   Function: MUSIC_Init

   Selects which sound device to use.
---------------------------------------------------------------------*/

int MUSIC_Init
   (
   int SoundCard,
   int Address
   )

   {
   int i;
   int status;

   for( i = 0; i < 128; i++ )
      {
      MIDI_PatchMap[ i ] = i;
      }

   MUSIC_SoundDevice = SoundCard;

   status = MUSIC_InitMidi( SoundCard, &MUSIC_MidiFunctions, Address );

   return( status );
   }


/*---------------------------------------------------------------------
   Function: MUSIC_Shutdown

   Terminates use of sound device.
---------------------------------------------------------------------*/

int MUSIC_Shutdown
   (
   void
   )

   {
   int status;

   status = MUSIC_Ok;

   MIDI_StopSong();

   //MPU_Reset();

   return( status );
   }


/*---------------------------------------------------------------------
   Function: MUSIC_SetVolume

   Sets the volume of music playback.
---------------------------------------------------------------------*/

void MUSIC_SetVolume
   (
   int volume
   )

   {
   volume = max( 0, volume );
   volume = min( volume, 255 );

   if ( MUSIC_SoundDevice != -1 )
      {
      MIDI_SetVolume( volume );
      }
   }


/*---------------------------------------------------------------------
   Function: MUSIC_SetMidiChannelVolume

   Sets the volume of music playback on the specified MIDI channel.
---------------------------------------------------------------------*/

void MUSIC_SetMidiChannelVolume
   (
   int channel,
   int volume
   )

   {
   MIDI_SetUserChannelVolume( channel, volume );
   }


/*---------------------------------------------------------------------
   Function: MUSIC_ResetMidiChannelVolumes

   Sets the volume of music playback on all MIDI channels to full volume.
---------------------------------------------------------------------*/

void MUSIC_ResetMidiChannelVolumes
   (
   void
   )

   {
   MIDI_ResetUserChannelVolume();
   }


/*---------------------------------------------------------------------
   Function: MUSIC_GetVolume

   Returns the volume of music playback.
---------------------------------------------------------------------*/

int MUSIC_GetVolume
   (
   void
   )

   {
   if ( MUSIC_SoundDevice == -1 )
      {
      return( 0 );
      }
   return( MIDI_GetVolume() );
   }


/*---------------------------------------------------------------------
   Function: MUSIC_SetLoopFlag

   Set whether the music will loop or end when it reaches the end of
   the song.
---------------------------------------------------------------------*/

void MUSIC_SetLoopFlag
   (
   int loopflag
   )

   {
   MIDI_SetLoopFlag( loopflag );
   }


/*---------------------------------------------------------------------
   Function: MUSIC_SongPlaying

   Returns whether there is a song playing.
---------------------------------------------------------------------*/

int MUSIC_SongPlaying
   (
   void
   )

   {
   return( MIDI_SongPlaying() );
   }


/*---------------------------------------------------------------------
   Function: MUSIC_Continue

   Continues playback of a paused song.
---------------------------------------------------------------------*/

void MUSIC_Continue
   (
   void
   )

   {
   MIDI_ContinueSong();
   }


/*---------------------------------------------------------------------
   Function: MUSIC_Pause

   Pauses playback of a song.
---------------------------------------------------------------------*/

void MUSIC_Pause
   (
   void
   )

   {
   MIDI_PauseSong();
   }


/*---------------------------------------------------------------------
   Function: MUSIC_StopSong

   Stops playback of current song.
---------------------------------------------------------------------*/

int MUSIC_StopSong
   (
   void
   )

   {
   MUSIC_StopFade();
   MIDI_StopSong();
   MUSIC_SetErrorCode( MUSIC_Ok );
   return( MUSIC_Ok );
   }


/*---------------------------------------------------------------------
   Function: MUSIC_PlaySong

   Begins playback of MIDI song.
---------------------------------------------------------------------*/

int MUSIC_PlaySong
   (
   unsigned char *song,
   int loopflag
   )

   {
   int status;

   MUSIC_StopSong();

   status = MIDI_PlaySong( song, loopflag );
   if ( status != MIDI_Ok )
      {
      MUSIC_SetErrorCode( MUSIC_MidiError );
      return( MUSIC_Warning );
      }

   return( MUSIC_Ok );
   }




/*---------------------------------------------------------------------
   Function: MUSIC_SetContext

   Sets the song context.
---------------------------------------------------------------------*/

void MUSIC_SetContext
   (
   int context
   )

   {
   MIDI_SetContext( context );
   }


/*---------------------------------------------------------------------
   Function: MUSIC_GetContext

   Returns the current song context.
---------------------------------------------------------------------*/

int MUSIC_GetContext
   (
   void
   )

   {
   return MIDI_GetContext();
   }


/*---------------------------------------------------------------------
   Function: MUSIC_SetSongTick

   Sets the position of the song pointer.
---------------------------------------------------------------------*/

void MUSIC_SetSongTick
   (
   unsigned long PositionInTicks
   )

   {
   MIDI_SetSongTick( PositionInTicks );
   }


/*---------------------------------------------------------------------
   Function: MUSIC_SetSongTime

   Sets the position of the song pointer.
---------------------------------------------------------------------*/

void MUSIC_SetSongTime
   (
   unsigned long milliseconds
   )

   {
   MIDI_SetSongTime( milliseconds );
   }


/*---------------------------------------------------------------------
   Function: MUSIC_SetSongPosition

   Sets the position of the song pointer.
---------------------------------------------------------------------*/

void MUSIC_SetSongPosition
   (
   int measure,
   int beat,
   int tick
   )

   {
   MIDI_SetSongPosition( measure, beat, tick );
   }


/*---------------------------------------------------------------------
   Function: MUSIC_GetSongPosition

   Returns the position of the song pointer.
---------------------------------------------------------------------*/

void MUSIC_GetSongPosition
   (
   songposition *pos
   )

   {
   MIDI_GetSongPosition( pos );
   }


/*---------------------------------------------------------------------
   Function: MUSIC_GetSongLength

   Returns the length of the song.
---------------------------------------------------------------------*/

void MUSIC_GetSongLength
   (
   songposition *pos
   )

   {
   MIDI_GetSongLength( pos );
   }


int MUSIC_InitMidi
   (
   int        card,
   midifuncs *Funcs,
   int        Address
   )

   {
   int status;

   Funcs->NoteOff           = MPU_NoteOff;
   Funcs->NoteOn            = MPU_NoteOn;
   Funcs->PolyAftertouch    = MPU_PolyAftertouch;
   Funcs->ControlChange     = MPU_ControlChange;
   Funcs->ProgramChange     = MPU_ProgramChange;
   Funcs->ChannelAftertouch = MPU_ChannelAftertouch;
   Funcs->PitchBend         = MPU_PitchBend;
   Funcs->ReleasePatches    = NULL;
   Funcs->LoadPatch         = NULL;
   Funcs->SetVolume         = NULL /*MPU_SetVolume*/;
   Funcs->GetVolume         = NULL /*MPU_GetVolume*/;

   MIDI_SetMidiFuncs( Funcs );

   return( MIDI_Ok );
   }


/*---------------------------------------------------------------------
   Function: MUSIC_FadeVolume

   Fades music volume from current level to another over a specified
   period of time.
---------------------------------------------------------------------*/

int MUSIC_FadeVolume
   (
   int tovolume,
   int milliseconds
   )

   {
   int fromvolume;

   MIDI_SetVolume( tovolume );
   return( MUSIC_Ok );
}


/*---------------------------------------------------------------------
   Function: MUSIC_FadeActive

   Returns whether the fade routine is active.
---------------------------------------------------------------------*/

int MUSIC_FadeActive
   (
   void
   )

   {
   return( 0 );
   }


/*---------------------------------------------------------------------
   Function: MUSIC_StopFade

   Stops fading the music.
---------------------------------------------------------------------*/

void MUSIC_StopFade
   (
   void
   )

   {
   }


/*---------------------------------------------------------------------
   Function: MUSIC_RerouteMidiChannel

   Sets callback function to reroute MIDI commands from specified
   function.
---------------------------------------------------------------------*/

void MUSIC_RerouteMidiChannel
   (
   int channel,
   int ( *function )( int event, int c1, int c2 )
   )

   {
   MIDI_RerouteMidiChannel( channel, function );
   }


/*---------------------------------------------------------------------
   Function: MUSIC_RegisterTimbreBank

   Halts playback of all sounds.
---------------------------------------------------------------------*/

void MUSIC_RegisterTimbreBank
   (
   unsigned char *timbres
   )

   {
   }


void MUSIC_Update(void)
{
	MIDI_UpdateMusic();
}

