1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
/* *****************************************************************************
* 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 "Gopher.hpp"
#include "../RomUtils.hpp"
namespace ale {
GopherSettings::GopherSettings() { reset(); }
/* create a new instance of the rom */
RomSettings* GopherSettings::clone() const {
RomSettings* rval = new GopherSettings();
*rval = *this;
return rval;
}
/* process the latest information from ALE */
void GopherSettings::step(const System& system) {
// update the reward
int score = getDecimalScore(0xB2, 0xB1, 0xB0, &system);
int reward = score - m_score;
m_reward = reward;
m_score = score;
// update terminal status
int carrot_bits = readRam(&system, 0xB4) & 0x7;
m_terminal = carrot_bits == 0;
// A very crude popcount
static int livesFromCarrots[] = {0, 1, 1, 2, 1, 2, 2, 3};
m_lives = livesFromCarrots[carrot_bits];
}
/* is end of game */
bool GopherSettings::isTerminal() const { return m_terminal; };
/* get the most recently observed reward */
reward_t GopherSettings::getReward() const { return m_reward; }
/* is an action part of the minimal set? */
bool GopherSettings::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_UPFIRE:
case PLAYER_A_RIGHTFIRE:
case PLAYER_A_LEFTFIRE:
return true;
default:
return false;
}
}
/* reset the state of the game */
void GopherSettings::reset() {
m_reward = 0;
m_score = 0;
m_terminal = false;
m_lives = 3;
}
/* saves the state of the rom settings */
void GopherSettings::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 GopherSettings::loadState(Deserializer& ser) {
m_reward = ser.getInt();
m_score = ser.getInt();
m_terminal = ser.getBool();
m_lives = ser.getInt();
}
ActionVect GopherSettings::getStartingActions() {
ActionVect startingActions;
startingActions.push_back(PLAYER_A_FIRE);
return startingActions;
}
// returns a list of mode that the game can be played in
ModeVect GopherSettings::getAvailableModes() {
ModeVect modes = {0, 2};
return modes;
}
// set the mode of the game
// the given mode must be one returned by the previous function
void GopherSettings::setMode(
game_mode_t m, System& system,
std::unique_ptr<StellaEnvironmentWrapper> environment) {
if (m == 0 || m == 2) {
environment->softReset();
// read the mode we are currently in
unsigned char mode = readRam(&system, 0xD3);
// press select until the correct mode is reached
while (mode != m) {
environment->pressSelect(5);
mode = readRam(&system, 0xD3);
}
//reset the environment to apply changes.
environment->softReset();
} else {
throw std::runtime_error("This mode doesn't currently exist for this game");
}
}
DifficultyVect GopherSettings::getAvailableDifficulties() {
DifficultyVect diff = {0, 1};
return diff;
}
} // namespace ale