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global.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-1-1-1/engines/agi/global.cpp $
 * $Id: global.cpp 41239 2009-06-06 17:39:13Z sev $
 *
 */

#include "agi/agi.h"

namespace Agi {

int AgiBase::getflag(int n) {
      uint8 *set = (uint8 *)&_game.flags;

      set += n >> 3;
      return (*set & (1 << (n & 0x07))) != 0;
}

void AgiBase::setflag(int n, int v) {
      uint8 *set = (uint8 *)&_game.flags;

      set += n >> 3;
      if (v)
            *set |= 1 << (n & 0x07);      // set bit
      else
            *set &= ~(1 << (n & 0x07));   // clear bit
}

void AgiBase::flipflag(int n) {
      uint8 *set = (uint8 *)&_game.flags;

      set += n >> 3;
      *set ^= 1 << (n & 0x07);      // flip bit
}

void AgiEngine::setvar(int var, int val) {
      _game.vars[var] = val;

      if (var == vVolume) {
            _mixer->setVolumeForSoundType(Audio::Mixer::kSFXSoundType, val * 17);
            _mixer->setVolumeForSoundType(Audio::Mixer::kMusicSoundType, val * 17);
      }
}

int AgiEngine::getvar(int var) {
      return _game.vars[var];
}

void AgiEngine::decrypt(uint8 *mem, int len) {
      const uint8 *key;
      int i;

      key = (getFeatures() & GF_AGDS) ? (const uint8 *)CRYPT_KEY_AGDS
                         : (const uint8 *)CRYPT_KEY_SIERRA;

      for (i = 0; i < len; i++)
            *(mem + i) ^= *(key + (i % 11));
}

} // End of namespace Agi

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