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annotate pytouhou/formats/ecl.py @ 204:88361534c77e

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Add some documentation (argh, so much left to document!)
author Thibaut Girka <thib@sitedethib.com>
date Tue, 01 Nov 2011 13:46:03 +0100
parents 2f3665a77f11
children f037bca24f2d
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ab826bc29aa2 Add some documentation, GPLv3 headers, README and COPYING file.
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1 # -*- encoding: utf-8 -*-
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2 ##
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3 ## Copyright (C) 2011 Thibaut Girka <thib@sitedethib.com>
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4 ##
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5 ## This program is free software; you can redistribute it and/or modify
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6 ## it under the terms of the GNU General Public License as published
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7 ## by the Free Software Foundation; version 3 only.
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8 ##
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9 ## This program is distributed in the hope that it will be useful,
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10 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 ## GNU General Public License for more details.
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13 ##
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14
204
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15 """ECL files handling.
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16
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17 This module provides classes for handling the ECL file format.
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18 The ECL format is a format used in Touhou 6: EoSD to script most of the gameplay
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19 aspects of the game, such as enemy movements, attacks, and so on.
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20 """
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21
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22 import struct
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23 from struct import pack, unpack, calcsize
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24
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25 from pytouhou.utils.helpers import get_logger
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26
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27 logger = get_logger(__name__)
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28
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29 class ECL(object):
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30 """Handle Touhou 6 ECL files.
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31
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32 ECL files are binary script files used to describe the behavior of enemies.
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33 They are basically composed of a header and two additional sections.
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34 The first section is a list of subroutines, each composed of a list of timed
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35 instructions.
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36 The second section is a list of a different set of instructions describing
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37 enemy waves, triggering dialogs and level completion.
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38
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39 Instance variables:
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40 main -- list of instructions describing waves and triggering dialogs
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41 subs -- list of subroutines
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42 """
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43
42
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44 _instructions = {0: ('', 'noop?'),
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45 1: ('I', 'delete?'),
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46 2: ('Ii', 'relative_jump'),
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47 3: ('Iii', 'relative_jump_ex'),
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48 4: ('ii', 'set_int'),
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49 5: ('if', 'set_float'),
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50 6: ('ii', 'set_random_int'),
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51 8: ('if', 'set_random_float'),
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52 9: ('iff', 'set_random_float2'),
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53 10: ('i', 'store_x'),
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54 13: ('iii', 'add_int'),
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55 14: ('iii', 'substract_int'),
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56 15: ('iii', 'multiply_int'),
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57 16: ('iii', 'divide_int'),
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58 17: ('iii', 'modulo'),
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59 18: ('i', 'increment'),
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60 20: ('iff', 'add_float'),
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61 21: ('iff', 'substract_float'),
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62 23: ('iff', 'divide_float'),
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63 25: ('iffff', 'get_direction'),
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64 26: ('i', 'float_to_unit_circle'), #TODO: find a better name
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65 27: ('ii', 'compare_ints'),
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66 28: ('ff', 'compare_floats'),
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67 29: ('ii', 'relative_jump_if_lower_than'),
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68 30: ('ii', 'relative_jump_if_lower_or_equal'),
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69 31: ('ii', 'relative_jump_if_equal'),
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70 32: ('ii', 'relative_jump_if_greater_than'),
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71 33: ('ii', 'relative_jump_if_greater_or_equal'),
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72 34: ('ii', 'relative_jump_if_not_equal'),
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73 35: ('iif', 'call'),
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74 36: ('', 'return'),
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75 39: ('iifii', 'call_if_equal'),
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76 43: ('fff', 'set_position'),
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77 45: ('ff', 'set_angle_and_speed'),
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78 46: ('f', 'set_rotation_speed'),
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79 47: ('f', 'set_speed'),
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80 48: ('f', 'set_acceleration'),
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81 49: ('ff', 'set_random_angle'),
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82 50: ('ff', 'set_random_angle_ex'),
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83 51: ('ff', 'set_speed_towards_player'),
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84 52: ('iff', 'move_in_decel'),
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85 56: ('ifff', 'move_to_linear'),
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86 57: ('ifff', 'move_to_decel'),
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87 59: ('iffi', 'move_to_accel'),
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88 61: ('i', 'stop_in'),
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89 63: ('i', 'stop_in_accel'),
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90 65: ('ffff', 'set_screen_box'),
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91 66: ('', 'clear_screen_box'),
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92 67: ('hhiiffffi', 'set_bullet_attributes'),
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93 68: ('hhiiffffi', 'set_bullet_attributes2'),
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94 69: ('hhiiffffi', 'set_bullet_attributes3'),
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95 70: ('hhiiffffi', 'set_bullet_attributes4'),
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96 71: ('hhiiffffi', 'set_bullet_attributes5'),
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97 74: ('hhiiffffi', 'set_bullet_attributes6'),
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98 75: ('hhiiffffi', 'set_bullet_attributes7'),
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99 76: ('i', 'set_bullet_interval'),
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100 77: ('i', 'set_bullet_interval_ex'),
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101 78: ('', 'delay_attack'),
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102 79: ('', 'no_delay_attack'),
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103 81: ('fff', 'set_bullet_launch_offset'),
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104 82: ('iiiiffff', 'set_extended_bullet_attributes'),
204
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105 83: ('', 'change_bullets_in_star_bonus'),
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106 84: ('i', None),
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107 85: ('hhffffffiiiiii', 'laser'),
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108 86: ('hhffffffiiiiii', 'laser2'),
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109 87: ('i', 'set_upcoming_id'),
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110 88: ('if','alter_laser_angle'),
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111 90: ('iiii', 'translate_laser'),
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112 92: ('i', 'cancel_laser'),
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113 93: ('hhs', 'set_spellcard'),
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114 94: ('', 'end_spellcard'),
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115 95: ('ifffhhi', 'spawn_enemy'),
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116 96: ('', 'kill_all_enemies'),
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117 97: ('i', 'set_anim'),
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118 98: ('hhhhhxx', 'set_multiple_anims'),
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119 99: ('ii', None),
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120 100: ('i', 'set_death_anim'),
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121 101: ('i', 'set_boss_mode?'),
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122 102: ('iffff', 'create_squares'),
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123 103: ('fff', 'set_enemy_hitbox'),
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124 104: ('i', 'set_collidable'),
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125 105: ('i', 'set_damageable'),
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126 106: ('i', 'play_sound'),
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127 107: ('i', 'set_death_flags'),
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128 108: ('i', 'set_death_callback?'),
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129 109: ('ii', 'memory_write_int'),
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130 111: ('i', 'set_life'),
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131 112: ('i', 'set_ellapsed_time'),
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132 113: ('i', 'set_low_life_trigger'),
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133 114: ('i', 'set_low_life_callback'),
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134 115: ('i', 'set_timeout'),
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135 116: ('i', 'set_timeout_callback'),
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136 117: ('i', 'set_touchable'),
42
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137 118: ('iihh', None),
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138 119: ('i', 'drop_bonus'),
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139 120: ('i', 'set_automatic_orientation'),
107
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140 121: ('ii', 'call_special_function'),
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141 122: ('i', None),
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142 123: ('i', 'skip_frames'),
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143 124: ('i', 'drop_specific_bonus'),
42
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144 125: ('', None),
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145 126: ('i', 'set_remaining_lives'),
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146 127: ('i', None),
204
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147 128: ('i', 'set_smooth_disappear'),
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148 129: ('ii', None),
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149 130: ('i', None),
204
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150 131: ('ffiiii', 'set_difficulty_coeffs'),
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151 132: ('i', 'set_invisible'),
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152 133: ('', None),
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153 134: ('', None),
204
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154 135: ('i', 'enable_spellcard_bonus')} #TODO
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155
171
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156 _main_instructions = {0: ('fffhhI', 'spawn_enemy'),
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157 2: ('fffhhI', 'spawn_enemy_mirrored'),
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158 4: ('fffhhI', 'spawn_enemy_random'),
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159 6: ('fffhhI', 'spawn_enemy_mirrored_random'),
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160 8: ('', None),
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161 9: ('', None),
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162 10: ('II', None),
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163 12: ('', None)}
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164
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165
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166 def __init__(self):
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167 self.main = []
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168 self.subs = [[]]
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169
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170
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171 @classmethod
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172 def read(cls, file):
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173 """Read an ECL file.
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174
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175 Raise an exception if the file is invalid.
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176 Return a ECL instance otherwise.
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177 """
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178
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179 sub_count, main_offset = unpack('<II', file.read(8))
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180 if file.read(8) != b'\x00\x00\x00\x00\x00\x00\x00\x00':
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181 raise Exception #TODO
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182 sub_offsets = unpack('<%dI' % sub_count, file.read(4 * sub_count))
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183
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184 ecl = cls()
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185 ecl.subs = []
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186 ecl.main = []
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187
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188 # Read subs
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189 for sub_offset in sub_offsets:
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190 file.seek(sub_offset)
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191 ecl.subs.append([])
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192
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193 instruction_offsets = []
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194
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195 while True:
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196 instruction_offsets.append(file.tell() - sub_offset)
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197
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198 time, opcode = unpack('<IH', file.read(6))
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199 if time == 0xffffffff or opcode == 0xffff:
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200 break
204
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201
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202 size, rank_mask, param_mask = unpack('<HHH', file.read(6))
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203 data = file.read(size - 12)
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204 if opcode in cls._instructions:
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205 fmt = '<%s' % cls._instructions[opcode][0]
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206 if fmt.endswith('s'):
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207 fmt = fmt[:-1]
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208 fmt = '%s%ds' % (fmt, size - 12 - calcsize(fmt))
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209 args = unpack(fmt, data)
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210 if fmt.endswith('s'):
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211 args = args[:-1] + (args[-1].decode('shift_jis'),)
42
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212 else:
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213 args = (data, )
58
3da4de9decd0 Use logging module
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diff changeset
214 logger.warn('unknown opcode %d', opcode)
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215
42
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diff changeset
216 ecl.subs[-1].append((time, opcode, rank_mask, param_mask, args))
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217
43
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218
204
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219 # Translate offsets to instruction pointers.
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220 # Indeed, jump instructions are relative and byte-based.
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221 # Since our representation doesn't conserve offsets, we have to
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222 # keep trace of where the jump is supposed to end up.
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223 for instr_offset, (i, instr) in zip(instruction_offsets, enumerate(ecl.subs[-1])):
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diff changeset
224 time, opcode, rank_mask, param_mask, args = instr
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a701a89192a9 Add offset translation for all relative jumps.
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diff changeset
225 if opcode in (2, 29, 30, 31, 32, 33, 34): # relative_jump
43
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226 frame, relative_offset = args
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227 args = frame, instruction_offsets.index(instr_offset + relative_offset)
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228 elif opcode == 3: # relative_jump_ex
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229 frame, relative_offset, counter_id = args
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230 args = frame, instruction_offsets.index(instr_offset + relative_offset), counter_id
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231 ecl.subs[-1][i] = time, opcode, rank_mask, param_mask, args
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232
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233
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234 # Read main
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235 file.seek(main_offset)
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236 while True:
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237 time, = unpack('<H', file.read(2))
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238 if time == 0xffff:
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239 break
112
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240
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241 sub, opcode, size = unpack('<HHH', file.read(6))
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242 data = file.read(size - 8)
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243
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244 if opcode in cls._main_instructions:
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245 args = unpack('<%s' % cls._main_instructions[opcode][0], data)
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246 else:
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247 args = (data,)
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248 logger.warn('unknown main opcode %d', opcode)
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249
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250 ecl.main.append((time, sub, opcode, args))
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251
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252 return ecl
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253
112
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254
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255 def write(self, file):
204
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256 """Write to an ECL file."""
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257
112
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258 sub_count = len(self.subs)
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259 sub_offsets = []
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260 main_offset = 0
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261
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262 # Skip header, it will be written later
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263 file.seek(8+8+4*sub_count)
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264
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265 # Write subs
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266 for sub in self.subs:
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267 sub_offsets.append(file.tell())
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268
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269 instruction_offsets = []
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270 instruction_datas = []
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271 for time, opcode, rank_mask, param_mask, args in sub:
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272 format = self._instructions[opcode][0]
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273 if format.endswith('s'):
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274 args = list(args)
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275 args[-1] = args[-1].encode('shift_jis')
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276 format = '%s%ds' % (format[:-1], len(args[-1]))
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277 format = '<IHHHH%s' % format
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278 size = calcsize(format)
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279 instruction_offsets.append((instruction_offsets[-1] + len(instruction_datas[-1])) if instruction_offsets else 0)
113
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280 try:
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281 instruction_datas.append(pack(format, time, opcode, size, rank_mask, param_mask, *args))
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282 except struct.error:
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283 logger.error('Failed to assemble opcode %d' % opcode)
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284 raise
112
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285
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286 #TODO: clean up this mess
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287 for instruction, data, offset in zip(sub, instruction_datas, instruction_offsets):
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288 time, opcode, rank_mask, param_mask, args = instruction
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289 if opcode in (2, 29, 30, 31, 32, 33, 34): # relative_jump
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290 frame, index = args
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291 args = frame, instruction_offsets[index] - offset
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292 format = '<IHHHH%s' % self._instructions[opcode][0]
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293 size = calcsize(format)
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294 data = pack(format, time, opcode, size, rank_mask, param_mask, *args)
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295 elif opcode == 3: # relative_jump_ex
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296 frame, index, counter_id = args
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297 args = frame, instruction_offsets[index] - offset, counter_id
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298 format = '<IHHHH%s' % self._instructions[opcode][0]
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299 size = calcsize(format)
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300 data = pack(format, time, opcode, size, rank_mask, param_mask, *args)
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301 file.write(data)
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302 file.write(b'\xff' * 6 + b'\x0c\x00\x00\xff\xff\x00')
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303
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304 # Write main
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305 main_offset = file.tell()
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306 for time, sub, opcode, args in self.main:
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307 format = '<HHHH%s' % self._main_instructions[opcode][0]
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308 size = calcsize(format)
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309
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310 file.write(pack(format, time, sub, opcode, size, *args))
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311 file.write(b'\xff\xff\x04\x00')
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312
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313 # Patch header
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314 file.seek(0)
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315 file.write(pack('<IIII%dI' % sub_count, sub_count, main_offset, 0, 0, *sub_offsets))
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316