/*
 * $Id$
 */

/*
 * Harbour Project source code:
 *    Low level tone code common to some GT drivers
 *
 * Copyright 2006 Przemyslaw Czerpak <druzus / at / priv.onet.pl>
 * www - http://www.harbour-project.org
 *
 * the body of TONE function from W32 taken from GTWIN created by
 * the following authors:
 * Copyright 1999 David G. Holm <dholm@jsd-llc.com>
 * Copyright 1999-2006 Paul Tucker <ptucker@sympatico.ca>
 * Copyright 2005 Andi Jahja <andij@aonlippo.co.id>
 * Copyright 2005 Przemyslaw Czerpak <druzus / at / priv.onet.pl>
 *
 * 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, 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 software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 USA (or visit the web site http://www.gnu.org/).
 *
 * As a special exception, the Harbour Project gives permission for
 * additional uses of the text contained in its release of Harbour.
 *
 * The exception is that, if you link the Harbour libraries with other
 * files to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * Your use of that executable is in no way restricted on account of
 * linking the Harbour library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by the Harbour
 * Project under the name Harbour.  If you copy code from other
 * Harbour Project or Free Software Foundation releases into a copy of
 * Harbour, as the General Public License permits, the exception does
 * not apply to the code that you add in this way.  To avoid misleading
 * anyone as to the status of such modified files, you must delete
 * this exception notice from them.
 *
 * If you write modifications of your own for Harbour, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.
 *
 */


/* NOTE: User programs should never call this layer directly! */


#define HB_OS_WIN_32_USED
#include "hbgtcore.h"

#if defined( HB_OS_WIN_32 )

#if defined( HB_ARCH_32BIT ) && !defined( _M_ARM ) && \
    ( defined(__BORLANDC__) || defined(_MSC_VER) || \
      defined(__WATCOMC__) || defined(__MINGW32__) )

#if defined(_MSC_VER) || defined(__WATCOMC__)
   #include <conio.h>
#endif

static int hb_Inp9x( USHORT usPort )
{
   USHORT usVal;

   HB_TRACE(HB_TR_DEBUG, ("hb_Inp9x(%hu)", usPort));

   #if defined( __BORLANDC__ ) || defined(__DMC__)

      _DX = usPort;
      __emit__(0xEC);         /* ASM  IN AL, DX */
      __emit__(0x32,0xE4);    /* ASM XOR AH, AH */
      usVal = _AX;

   #elif ( defined( __XCC__ ) || defined( __POCC__ ) ) && defined( _M_IX86 )

      __asm {
               mov   dx, usPort
               xor   ax, ax
               in    al, dx
               mov   usVal, ax
            }

   #elif defined( __MINGW32__ )
      __asm__ __volatile__ ("inb %w1,%b0":"=a" (usVal):"Nd" (usPort));

   #elif defined( __WATCOMC__ )

      usVal = inp( usPort );

   #else

      usVal = _inp( usPort );

   #endif

   return usVal;
}

/* *********************************************************************** */

static int hb_Outp9x( USHORT usPort, USHORT usVal )
{
   HB_TRACE(HB_TR_DEBUG, ("hb_Outp9x(%hu, %hu)", usPort, usVal));

   #if defined( __BORLANDC__ ) || defined(__DMC__)

      _DX = usPort;
      _AL = usVal;
      __emit__(0xEE);        /* ASM OUT DX, AL */

   #elif ( defined( __XCC__ ) || defined( __POCC__ ) ) && defined( _M_IX86 )

      __asm {
               mov   dx, usPort
               mov   ax, usVal
               out   dx, al
            }

   #elif defined( __MINGW32__ )

      __asm__ __volatile__ ("outb %b0,%w1": :"a" (usVal), "Nd" (usPort));

   #elif defined( __WATCOMC__ )

       outp( usPort, usVal );

   #else

      _outp( usPort, usVal );

   #endif

   return usVal;
}

/* *********************************************************************** */
/* dDurat is in seconds */
static void hb_gt_w9xTone( double dFreq, double dDurat )
{
   INT uLSB,uMSB;
   ULONG lAdjFreq;

   HB_TRACE(HB_TR_DEBUG, ("hb_gt_w9xtone(%lf, %lf)", dFreq, dDurat));

   /* sync with internal clock with very small time period */
   hb_idleSleep( 0.01 );

   /* Clipper ignores Tone() requests (but delays anyway) if Frequency is
      less than < 20 hz (and so should we) to maintain compatibility .. */

   if( dFreq >= 20.0 )
   {
      /* Setup Sound Control Port Registers and timer channel 2 */
      hb_Outp9x(67, 182) ;

      lAdjFreq = (ULONG)( 1193180 / dFreq ) ;

      if( (LONG) lAdjFreq < 0 )
         uLSB = lAdjFreq + 65536;
      else
         uLSB = lAdjFreq % 256;

      if( (LONG) lAdjFreq < 0 )
         uMSB = lAdjFreq + 65536;
      else
         uMSB = lAdjFreq / 256;


      /* set the frequency (LSB,MSB) */

      hb_Outp9x(66, uLSB);
      hb_Outp9x(66, uMSB);

      /* Get current Port setting */
      /* enable Speaker Data & Timer gate bits */
      /* (00000011B is bitmask to enable sound) */
      /* Turn on Speaker - sound Tone for duration.. */

      hb_Outp9x(97, hb_Inp9x( 97 ) | 3);

      hb_idleSleep( dDurat );

      /* Read back current Port value for Reset */
      /* disable Speaker Data & Timer gate bits */
      /* (11111100B is bitmask to disable sound) */
      /* Turn off the Speaker ! */

      hb_Outp9x(97, hb_Inp9x( 97 ) & 0xFC);
   }
   else
   {
      hb_idleSleep( dDurat );
   }
}
#endif

/* *********************************************************************** */
/* dDurat is in seconds */
static void hb_gt_wNtTone( double dFreq, double dDurat )
{
   HB_TRACE(HB_TR_DEBUG, ("hb_gt_wNtTone(%lf, %lf)", dFreq, dDurat));

   /* Clipper ignores Tone() requests (but delays anyway) if Frequency is
      less than < 20 hz.  Windows NT minimum is 37... */

   if( dFreq >= 37.0 )
   {
      Beep( (ULONG) dFreq, (ULONG) ( dDurat * 1000 ) ); /* Beep wants Milliseconds */
   }
   else
   {
      hb_idleSleep( dDurat );
   }
}

/* *********************************************************************** */
/* dDuration is in 'Ticks' (18.2 per second) */
void hb_gt_w32_tone( double dFrequency, double dDuration )
{
   HB_TRACE(HB_TR_DEBUG, ("hb_gt_w32_tone(%lf, %lf)", dFrequency, dDuration));

   /*
    * According to the Clipper NG, the duration in 'ticks' is truncated to the
    * interger portion  ... Depending on the platform, Harbour allows a finer
    * resolution, but the minimum is 1 tick (for compatibility)
    */
   /* Convert from ticks to seconds */
   dDuration  = ( HB_MIN( HB_MAX( 1.0, dDuration ), ULONG_MAX ) ) / 18.2;

   /* keep the frequency in an acceptable range */
   dFrequency =   HB_MIN( HB_MAX( 0.0, dFrequency ), 32767.0 );

   /* If Windows NT or NT2k, use wNtTone, which provides TONE()
      reset sequence support (new) */
   if( hb_iswinnt() || hb_iswince() )
   {
      hb_gt_wNtTone( dFrequency, dDuration );
   }
   else  /* If Windows 95 or 98, use w9xTone for chosen C compilers */
   {
      #if defined( HB_ARCH_32BIT ) && !defined( _M_ARM ) && \
           ( defined( __BORLANDC__ ) || defined( _MSC_VER ) || \
             defined( __WATCOMC__ )  || defined(__MINGW32__) )
         hb_gt_w9xTone( dFrequency, dDuration );
      #else
         hb_gt_wNtTone( dFrequency, dDuration );
      #endif
   }
}

#endif /* HB_OS_WIN_32 */