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/* *****************************************************************************
* The method lives() is based on Xitari's code, from Google Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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.
* *****************************************************************************
* 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 "Gravitar.hpp"
#include "../RomUtils.hpp"
namespace ale {
GravitarSettings::GravitarSettings() { reset(); }
/* create a new instance of the rom */
RomSettings* GravitarSettings::clone() const {
RomSettings* rval = new GravitarSettings();
*rval = *this;
return rval;
}
/* process the latest information from ALE */
void GravitarSettings::step(const System& system) {
// update the reward
int score = getDecimalScore(9, 8, 7, &system);
int reward = score - m_score;
m_reward = reward;
m_score = score;
// Byte 0x81 contains information about the current screen
int screen_byte = readRam(&system, 0x81);
// update terminal status
m_terminal = screen_byte == 0x01;
// On the starting screen, we set our lives total to 6; otherwise read it from data
m_lives = screen_byte == 0x0 ? 6 : (readRam(&system, 0x84) + 1);
}
/* is end of game */
bool GravitarSettings::isTerminal() const { return m_terminal; };
/* get the most recently observed reward */
reward_t GravitarSettings::getReward() const { return m_reward; }
/* is an action part of the minimal set? */
bool GravitarSettings::isMinimal(const Action& a) const {
switch (a) {
case PLAYER_A_NOOP:
case PLAYER_A_FIRE:
case PLAYER_A_UP:
case PLAYER_A_RIGHT:
case PLAYER_A_LEFT:
case PLAYER_A_DOWN:
case PLAYER_A_UPRIGHT:
case PLAYER_A_UPLEFT:
case PLAYER_A_DOWNRIGHT:
case PLAYER_A_DOWNLEFT:
case PLAYER_A_UPFIRE:
case PLAYER_A_RIGHTFIRE:
case PLAYER_A_LEFTFIRE:
case PLAYER_A_DOWNFIRE:
case PLAYER_A_UPRIGHTFIRE:
case PLAYER_A_UPLEFTFIRE:
case PLAYER_A_DOWNRIGHTFIRE:
case PLAYER_A_DOWNLEFTFIRE:
return true;
default:
return false;
}
}
/* reset the state of the game */
void GravitarSettings::reset() {
m_reward = 0;
m_score = 0;
m_terminal = false;
m_lives = 6;
}
/* saves the state of the rom settings */
void GravitarSettings::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 GravitarSettings::loadState(Deserializer& ser) {
m_reward = ser.getInt();
m_score = ser.getInt();
m_terminal = ser.getBool();
m_lives = ser.getInt();
}
ActionVect GravitarSettings::getStartingActions() {
ActionVect startingActions;
for (int i = 0; i < 16; i++)
startingActions.push_back(PLAYER_A_FIRE);
return startingActions;
}
// returns a list of mode that the game can be played in
ModeVect GravitarSettings::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 GravitarSettings::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) {
// hold select button for 10 frames
environment->pressSelect(10);
mode = readRam(&system, 0x80);
}
//update the number of lives
switch (m) {
case 0:
case 2:
m_lives = 6;
break;
case 1:
m_lives = 15;
break;
case 3:
m_lives = 100;
break;
case 4:
m_lives = 25;
break;
}
//reset the environment to apply changes.
environment->softReset();
} else {
throw std::runtime_error("This mode doesn't currently exist for this game");
}
}
} // namespace ale