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/* *****************************************************************************
* The method lives() is based on Xitari's code, from Google Inc.
*
* 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 "Freeway.hpp"
#include "../RomUtils.hpp"
namespace ale {
FreewaySettings::FreewaySettings() {
m_reward = 0;
m_score = 0;
m_terminal = false;
}
/* create a new instance of the rom */
RomSettings* FreewaySettings::clone() const {
RomSettings* rval = new FreewaySettings();
*rval = *this;
return rval;
}
/* process the latest information from ALE */
void FreewaySettings::step(const System& system) {
// update the reward
int score = getDecimalScore(103, -1, &system);
int reward = score - m_score;
if (reward < 0)
reward = 0;
if (reward > 1)
reward = 1;
m_reward = reward;
m_score = score;
// update terminal status
m_terminal = readRam(&system, 22) == 1;
}
/* is end of game */
bool FreewaySettings::isTerminal() const { return m_terminal; };
/* get the most recently observed reward */
reward_t FreewaySettings::getReward() const { return m_reward; }
/* is an action part of the minimal set? */
bool FreewaySettings::isMinimal(const Action& a) const {
switch (a) {
case PLAYER_A_NOOP:
case PLAYER_A_UP:
case PLAYER_A_DOWN:
return true;
default:
return false;
}
}
/* reset the state of the game */
void FreewaySettings::reset() {
m_reward = 0;
m_score = 0;
m_terminal = false;
}
/* saves the state of the rom settings */
void FreewaySettings::saveState(Serializer& ser) {
ser.putInt(m_reward);
ser.putInt(m_score);
ser.putBool(m_terminal);
}
// loads the state of the rom settings
void FreewaySettings::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 FreewaySettings::getAvailableModes() {
ModeVect modes(getNumModes());
for (unsigned int i = 0; i < modes.size(); i++) {
modes[i] = i;
}
return modes;
}
// set the mode of the game
// the given mode must be one returned by the previous function
void FreewaySettings::setMode(
game_mode_t m, System& system,
std::unique_ptr<StellaEnvironmentWrapper> environment) {
if (m < getNumModes()) {
// read the mode we are currently in
unsigned char mode = readRam(&system, 0x80);
// press select until the correct mode is reached
while (mode != m) {
environment->pressSelect();
mode = readRam(&system, 0x80);
}
//reset the environment to apply changes.
environment->softReset();
} else {
throw std::runtime_error("This mode doesn't currently exist for this game");
}
}
DifficultyVect FreewaySettings::getAvailableDifficulties() {
DifficultyVect diff = {0, 1};
return diff;
}
} // namespace ale