fmopldrv.h

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/*
Copyright (C) 2000, 2001, 2002  Ryan Nunn

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.
*/

#ifndef FMOPLDRV_H
#define FMOPLDRV_H

#ifdef USE_FMOPL_MIDI

#include "common_types.h"
#include "fmopl.h"

struct midi_event;

//
// The Internal OplDriver. Only slightly modified for exult
//
class OplDriver {

public:

  /* error codes returned by open.
   * can be converted to a string with get_error_name()
   */
  enum {
    MERR_CANNOT_CONNECT = 1,
    MERR_STREAMING_NOT_AVAILABLE = 2,
    MERR_DEVICE_NOT_AVAILABLE = 3,
    MERR_ALREADY_OPEN = 4,
  };

  // Modulation Registers
  #define INDEX_AVEKM_M 0
  #define INDEX_KSLTL_M 2
  #define INDEX_AD_M    4
  #define INDEX_SR_M    6
  #define INDEX_WAVE_M  8

  // Carrier Registers
  #define INDEX_AVEKM_C 1
  #define INDEX_KSLTL_C 3
  #define INDEX_AD_C    5
  #define INDEX_SR_C    7
  #define INDEX_WAVE_C  9

  #define INDEX_FB_C    10
  #define INDEX_PERC    11

  #define CHP_CHAN    0
  #define CHP_NOTE    1
  #define CHP_COUNTER   2
  #define CHP_VEL     3

  /* open the midi driver.
   * returns 0 if successful.
   * otherwise an error code. */
  int open(int sample_rate);

  /* close the midi driver */
  void close();

  /* output a packed midi command to the midi stream
   * valid only if mode is MO_SIMPLE
   */
  void send(uint32 b);

  /* retrieve a string representation of an error code */
  static const char *get_error_name(int error_code);

  // Loads the mt32 bank from <STATIC>/XMIDI.AD
  void LoadMT32Bank(bool force_xmidi);

  void generate_samples(sint16 *buf, uint32 len);

  OplDriver();
  ~OplDriver();

private:
  struct midi_channel {
    int inum;
    unsigned char ins[12];
    bool xmidi;
    int xmidi_bank;
    int vol;
    int expression;
    int nshift;
    int on;
    int pitchbend;
  };
  struct xmidibank {
    unsigned char insbank[128][12];
  };

  enum {
    ADLIB_MELODIC = 0,
    ADLIB_RYTHM = 1
  };

  void midi_write_adlib(unsigned int reg, unsigned char val);
  void midi_fm_instrument(int voice, unsigned char *inst);
  int  midi_calc_volume(int chan, int vel);
  void midi_update_volume(int chan);
  void midi_fm_volume(int voice, int volume);
  void midi_fm_playnote(int voice, int note, int volume, int pitchbend);
  void midi_fm_endnote(int voice);
  unsigned char adlib_data[256];

  void LoadXMIDIBank(const char *fn);
  void LoadU7VBank(const char *fn);


  int chp[9][4];
  unsigned char myinsbank[128][12];
  xmidibank   *xmidibanks[128];

  FM_OPL *_opl;
  midi_channel ch[16];
};

#endif //USE_FMOPL_MIDI

#endif //FMOPLDRV_H

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