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 "Bowling.hpp"

#include "../RomUtils.hpp"

namespace ale {

BowlingSettings::BowlingSettings() { reset(); }

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

/* process the latest information from ALE */
void BowlingSettings::step(const System& system) {
  // update the reward
  reward_t score = getDecimalScore(0xA1, 0xA6, &system);
  m_reward = score - m_score;
  m_score = score;

  // update terminal status
  int round = readRam(&system, 0xA4);
  m_terminal = round > 0x10;
}

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

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

/* is an action part of the minimal set? */
bool BowlingSettings::isMinimal(const Action& a) const {
  switch (a) {
    case PLAYER_A_NOOP:
    case PLAYER_A_FIRE:
    case PLAYER_A_UP:
    case PLAYER_A_DOWN:
    case PLAYER_A_UPFIRE:
    case PLAYER_A_DOWNFIRE:
      return true;
    default:
      return false;
  }
}

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

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

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

// returns a list of mode that the game can be played in
ModeVect BowlingSettings::getAvailableModes() {
  ModeVect modes = {0, 2, 4};
  return modes;
}

// set the mode of the game
// the given mode must be one returned by the previous function
void BowlingSettings::setMode(
    game_mode_t m, System& system,
    std::unique_ptr<StellaEnvironmentWrapper> environment) {
  if (m == 0 || m == 2 || m == 4) {
    // read the mode we are currently in
    unsigned char mode = readRam(&system, 2);
    // press select until the correct mode is reached
    while (mode != m) {
      environment->pressSelect(2);
      mode = readRam(&system, 2);
    }
    //reset the environment to apply changes.
    environment->softReset();
  } else {
    throw std::runtime_error("This mode doesn't currently exist for this game");
  }
}

DifficultyVect BowlingSettings::getAvailableDifficulties() {
  DifficultyVect diff = {0, 1};
  return diff;
}

}  // namespace ale