annotate pytouhou/formats/ecl.py @ 316:f0be7ea62330

Fix a bug with ECL instruction 96, and fix overall ECL handling. The issue with instruction 96 was about death callbacks, being executed on the caller of instruction 96 instead of the dying enemies. This was introduced by changeset 5930b33a0370. Additionnaly, ECL processes are now an attribute of the Enemy, and death/timeout conditions are checked right after the ECL frame, even if the ECL script has already ended, just like in the original game.
author Thibaut Girka <thib@sitedethib.com>
date Thu, 29 Mar 2012 21:18:35 +0200
parents 4838e9bab0f9
children 3be4c1078095
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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
113
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22 import struct
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23 from struct import pack, unpack, calcsize
18
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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'),
42
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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'),
42
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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'),
274
f037bca24f2d Partially implement lasers.
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111 90: ('ifff', 'reposition_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?'),
46
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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'),
42
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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),
46
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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'),
42
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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'),
42
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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'),
42
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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'),
286
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160 8: ('', 'call_msg'),
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161 9: ('', 'wait_msg'),
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162 10: ('II', 'resume_ecl'),
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163 12: ('', 'stop_time')}
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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)
42
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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)
43
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diff changeset
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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diff changeset
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.
43
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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
66
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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diff changeset
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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diff changeset
231 ecl.subs[-1][i] = time, opcode, rank_mask, param_mask, args
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232
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233
18
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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))
18
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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)
18
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246 else:
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247 args = (data,)
112
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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