/*
  playsound.c

  Copyright (c) 2002-2009
  http://www.tuxpaint.org/

  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
  (See COPYING.txt)

  $Id: playsound.c,v 1.7 2009/11/22 23:17:35 albert Exp $
*/

#include "playsound.h"
#include "debug.h"

#ifndef NOSOUND
Mix_Chunk *sounds[NUM_SOUNDS];
#endif

int mute;
int use_sound = 1;
static int old_sound[4] = { -1, -1, -1, -1 };

void playsound(SDL_Surface * screen, int chan, int s, int override, int x,
	       int y)
{
#ifndef NOSOUND
  int left, dist;

  if (!mute && use_sound && s != SND_NONE)
  {
    if (override || !Mix_Playing(chan))
    {
      Mix_PlayChannel(chan, sounds[s], 0);

      old_sound[chan] = s;
    }

    if (old_sound[chan] == s)
    {
      if (y == SNDDIST_NEAR)
	dist = 0;
      else
      {
	if (y < 0)
	  y = 0;
	else if (y >= screen->h - 1)
	  y = screen->h - 1;

	dist = (255 * ((screen->h - 1) - y)) / (screen->h - 1);
      }

      if (x == SNDPOS_LEFT)
	left = 255 - dist;
      else if (x == SNDPOS_CENTER)
	left = (255 - dist) / 2;
      else if (x == SNDPOS_RIGHT)
	left = 0;
      else
      {
	if (x < 0)
	  x = 0;
	else if (x >= screen->w)
	  x = screen->w - 1;

	left = ((255 - dist) * ((screen->w - 1) - x)) / (screen->w - 1);
      }



      Mix_SetPanning(chan, left, (255 - dist) - left);
    }
  }
#endif
}