ale-sys 0.1.2

Rust bindings to the Arcade Learning Environment
Documentation 
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/* *****************************************************************************
 * A.L.E (Arcade Learning Environment)
 * Copyright (c) 2009-2013 by Yavar Naddaf, Joel Veness, Marc G. Bellemare and
 *   the Reinforcement Learning and Artificial Intelligence Laboratory
 * Released under the GNU General Public License; see License.txt for details.
 *
 * Based on: Stella  --  "An Atari 2600 VCS Emulator"
 * Copyright (c) 1995-2007 by Bradford W. Mott and the Stella team
 *
 * *****************************************************************************
 */

#include "SirLancelot.hpp"

#include "../RomUtils.hpp"

namespace ale {

SirLancelotSettings::SirLancelotSettings() { reset(); }

/* create a new instance of the rom */
RomSettings* SirLancelotSettings::clone() const {
  RomSettings* rval = new SirLancelotSettings();
  *rval = *this;
  return rval;
}

/* process the latest information from ALE */
void SirLancelotSettings::step(const System& system) {
  // update the reward
  int score = getDecimalScore(0xA0, 0x9F, 0x9E, &system);
  int reward = score - m_score;
  m_reward = reward;
  m_score = score;

  // update terminal status
  m_lives = readRam(&system, 0xA9);
  m_terminal = (m_lives == 0) && readRam(&system, 0xA7) == 0xA0;
}

/* is end of game */
bool SirLancelotSettings::isTerminal() const { return m_terminal; };

/* get the most recently observed reward */
reward_t SirLancelotSettings::getReward() const { return m_reward; }

/* is an action part of the minimal set? */
bool SirLancelotSettings::isMinimal(const Action& a) const {
  switch (a) {
    case PLAYER_A_NOOP:
    case PLAYER_A_FIRE:
    case PLAYER_A_RIGHT:
    case PLAYER_A_LEFT:
    case PLAYER_A_RIGHTFIRE:
    case PLAYER_A_LEFTFIRE:
      return true;
    default:
      return false;
  }
}

/* reset the state of the game */
void SirLancelotSettings::reset() {
  m_reward = 0;
  m_score = 0;
  m_terminal = false;
  m_lives = 3;
}

/* saves the state of the rom settings */
void SirLancelotSettings::saveState(Serializer& ser) {
  ser.putInt(m_reward);
  ser.putInt(m_score);
  ser.putBool(m_terminal);
  ser.putInt(m_lives);
}

// loads the state of the rom settings
void SirLancelotSettings::loadState(Deserializer& ser) {
  m_reward = ser.getInt();
  m_score = ser.getInt();
  m_terminal = ser.getBool();
  m_lives = ser.getInt();
}

ActionVect SirLancelotSettings::getStartingActions() {
  ActionVect startingActions;
  startingActions.push_back(RESET);
  startingActions.push_back(PLAYER_A_LEFT);
  return startingActions;
}

}  // namespace ale