oasismixer.cpp

使用stl技术,(还没看,是听说的)

/******************************************************************************
 * This source file is part of Bad Camel Gaming
 * Copyright (C) 2003  Zephie Greyvenstein
 * See Readme.html for acknowledgements
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *****************************************************************************/

/******************************************************************************
 * FILENAME    : oasisMixer.cpp
 * DESCRIPTION : Mixer base class
 * AUTHOR      : Zephie Greyvenstein
 *****************************************************************************/

#include "oasisMixer.h"
#include "oasisException.h"
#include "oasisAudioCommon.h"

#include "OgreLogManager.h"

namespace Oasis {
  
  // Init static members
  real mixer::masterVolume = 0;
  uint8 mixer::mixerCount = 0;

  mixer::mixer( ) {
    // Only start openal the first time a sound based system starts
    if ( mixerCount == 0 ) {
      // Auto init
      // Manual init should work here but doesnt for me....must look into it
      alutInit ( NULL, 0 );
      
      if ( alGetError( ) != AL_NO_ERROR ) {
  oasisError( exception::ET_INTERNAL_ERROR,
        "Could not create initialise sound device",
        "mixer::( )" );
      }
    }
    // Make sure no other sound based systems try to restart
    mixerCount++;
    // Default master volume
    masterVolume = 1;
  }

  mixer::~mixer( ) {
    // Let mixer know one sound based system is going
    mixerCount--;
    // If this is the last one to stop, deinit openal
    if ( mixerCount == 0 ) {
      // Auto deinit
      alutExit();
      
      if ( alGetError( ) != AL_NO_ERROR ) {
  oasisError( exception::ET_INTERNAL_ERROR,
        "Could not create deinitialise sound device",
        "mixer::~( )" );
      }
    }
  }

  void mixer::setMasterVolume( real newVolume ) {
    masterVolume = newVolume;
    // Set the listener to the master volume
    alListenerf( AL_GAIN, ( ALfloat )masterVolume );
  }

  const real mixer::getMasterVolume( void ) {
    return masterVolume;
  }
}