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 "Enduro.hpp"

#include "../RomUtils.hpp"

namespace ale {

EnduroSettings::EnduroSettings() { reset(); }

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

/* process the latest information from ALE */
void EnduroSettings::step(const System& system) {
  // update the reward
  int score = 0;
  int level = readRam(&system, 0xAD);
  if (level != 0) {
    int cars_passed = getDecimalScore(0xAB, 0xAC, &system);
    if (level == 1)
      cars_passed = 200 - cars_passed;
    else if (level >= 2)
      cars_passed = 300 - cars_passed;
    else
      assert(false);

    // First level has 200 cars
    if (level >= 2) {
      score = 200;
      // For every level after the first, 300 cars
      score += (level - 2) * 300;
    }
    score += cars_passed;
  }

  m_reward = score - m_score;
  m_score = score;

  // update terminal status
  //int timeLeft = readRam(&system, 0xB1);
  int deathFlag = readRam(&system, 0xAF);
  m_terminal = deathFlag == 0xFF;
}

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

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

/* is an action part of the minimal set? */
bool EnduroSettings::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_DOWN:
    case PLAYER_A_DOWNRIGHT:
    case PLAYER_A_DOWNLEFT:
    case PLAYER_A_RIGHTFIRE:
    case PLAYER_A_LEFTFIRE:
      return true;
    default:
      return false;
  }
}

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

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

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

ActionVect EnduroSettings::getStartingActions() {
  ActionVect startingActions;
  startingActions.push_back(PLAYER_A_FIRE);
  return startingActions;
}

}  // namespace ale