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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 "RiverRaid.hpp"
#include "../RomUtils.hpp"
namespace ale {
RiverRaidSettings::RiverRaidSettings() {
m_ram_vals_to_digits[0] = 0;
m_ram_vals_to_digits[8] = 1;
m_ram_vals_to_digits[16] = 2;
m_ram_vals_to_digits[24] = 3;
m_ram_vals_to_digits[32] = 4;
m_ram_vals_to_digits[40] = 5;
m_ram_vals_to_digits[48] = 6;
m_ram_vals_to_digits[56] = 7;
m_ram_vals_to_digits[64] = 8;
m_ram_vals_to_digits[72] = 9;
reset();
}
/* create a new instance of the rom */
RomSettings* RiverRaidSettings::clone() const {
RomSettings* rval = new RiverRaidSettings();
*rval = *this;
return rval;
}
/* process the latest information from ALE */
void RiverRaidSettings::step(const System& system) {
// update the reward
int score = 0;
int digit = m_ram_vals_to_digits[readRam(&system, 87)];
score += digit;
digit = m_ram_vals_to_digits[readRam(&system, 85)];
score += 10 * digit;
digit = m_ram_vals_to_digits[readRam(&system, 83)];
score += 100 * digit;
digit = m_ram_vals_to_digits[readRam(&system, 81)];
score += 1000 * digit;
digit = m_ram_vals_to_digits[readRam(&system, 79)];
score += 10000 * digit;
digit = m_ram_vals_to_digits[readRam(&system, 77)];
score += 100000 * digit;
m_reward = score - m_score;
m_score = score;
// update terminal status
int byte_val = readRam(&system, 0xC0);
m_terminal = (byte_val == 0x58 && m_lives_byte == 0x59);
m_lives_byte = byte_val;
}
int RiverRaidSettings::numericLives() const {
// The last life, which is effectively empty, is stored as a '0x59'; but initially the
// value is 0x58 == 0, which then changes to 0x18 == 3 lives when the ship reaches the
// edge of the screen
return m_lives_byte == 0x58 ? 4 : // Assume beginning of episode
m_lives_byte == 0x59 ? 1 : (m_lives_byte / 8 + 1);
}
/* is end of game */
bool RiverRaidSettings::isTerminal() const { return m_terminal; };
/* get the most recently observed reward */
reward_t RiverRaidSettings::getReward() const { return m_reward; }
/* is an action part of the minimal set? */
bool RiverRaidSettings::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 RiverRaidSettings::reset() {
m_lives = 0;
m_reward = 0;
m_score = 0;
m_terminal = false;
m_lives_byte = 0x58;
}
/* saves the state of the rom settings */
void RiverRaidSettings::saveState(Serializer& ser) {
ser.putInt(m_reward);
ser.putInt(m_score);
ser.putBool(m_terminal);
ser.putInt(m_lives_byte);
}
// loads the state of the rom settings
void RiverRaidSettings::loadState(Deserializer& ser) {
m_reward = ser.getInt();
m_score = ser.getInt();
m_terminal = ser.getBool();
m_lives_byte = ser.getInt();
}
DifficultyVect RiverRaidSettings::getAvailableDifficulties() {
DifficultyVect diff = {0, 1};
return diff;
}
} // namespace ale