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annotate pytouhou/formats/std.py @ 219:091301805cce

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Move “eclviewer.py” to “eosd” and get rid of run-time depency on Cython.
author Thibaut Girka <thib@sitedethib.com>
date Thu, 15 Dec 2011 19:24:11 +0100
parents 88361534c77e
children 61adb5453e46
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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
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15 """Stage Definition (STD) files handling.
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16
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17 This module provides classes for handling the Stage Definition file format.
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18 The STD file format is a format used in Touhou 6: EoSD to describe non-gameplay
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19 aspects of a stage: its name, its music, 3D models composing its background,
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20 and various scripted events such as camera movement.
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21 """
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22
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23
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24 from struct import pack, unpack, calcsize
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25 from pytouhou.utils.helpers import read_string, get_logger
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27 logger = get_logger(__name__)
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29
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30 class Model(object):
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31 def __init__(self, unknown=0, bounding_box=None, quads=None):
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32 self.unknown = 0
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33 self.bounding_box = bounding_box or (0., 0., 0.,
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34 0., 0., 0.)
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35 self.quads = quads or []
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36
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37
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38
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39 class Stage(object):
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40 """Handle Touhou 6 Stage Definition files.
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41
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42 Stage Definition files are structured files describing non-gameplay aspects
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43 aspects of a stage. They are split in a header an 3 additional sections.
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44
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45 The header contains the name of the stage, the background musics (BGM) used,
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46 as well as the number of quads and objects composing the background.
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47 The first section describes the models composing the background, whereas
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48 the second section dictates how they are used.
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49 The last section describes the changes to the camera, fog, and other things.
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50
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51 Instance variables:
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52 name -- name of the stage
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53 bgms -- list of (name, path) describing the different background musics used
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54 models -- list of Model objects
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55 object_instances -- list of instances of the aforementioned models
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56 script -- stage script (camera, fog, etc.)
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57 """
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58
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59 _instructions = {0: ('fff', 'set_viewpos'),
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60 1: ('BBBxff', 'set_fog'),
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61 2: ('fff', 'set_viewpos2'),
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62 3: ('Ixxxxxxxx', 'start_interpolating_viewpos2'),
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63 4: ('Ixxxxxxxx', 'start_interpolating_fog')}
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64
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65 def __init__(self):
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66 self.name = ''
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67 self.bgms = (('', ''), ('', ''), ('', ''), ('', ''))
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68 self.models = []
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69 self.object_instances = []
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70 self.script = []
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71
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72
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73 @classmethod
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74 def read(cls, file):
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75 """Read a Stage Definition file.
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76
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77 Raise an exception if the file is invalid.
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78 Return a STD instance otherwise.
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79 """
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80
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81 stage = Stage()
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82
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83 nb_models, nb_faces = unpack('<HH', file.read(4))
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84 object_instances_offset, script_offset = unpack('<II', file.read(8))
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85 if file.read(4) != b'\x00\x00\x00\x00':
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86 raise Exception #TODO
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87
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88 stage.name = read_string(file, 128, 'shift_jis')
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89
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90 bgm_a = read_string(file, 128, 'shift_jis')
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91 bgm_b = read_string(file, 128, 'shift_jis')
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92 bgm_c = read_string(file, 128, 'shift_jis')
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93 bgm_d = read_string(file, 128, 'shift_jis')
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94
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95 bgm_a_path = read_string(file, 128, 'ascii')
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96 bgm_b_path = read_string(file, 128, 'ascii')
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97 bgm_c_path = read_string(file, 128, 'ascii')
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98 bgm_d_path = read_string(file, 128, 'ascii')
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99
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100 stage.bgms = [(bgm_a, bgm_a_path), (bgm_b, bgm_b_path), (bgm_c, bgm_c_path), (bgm_d, bgm_d_path)] #TODO: handle ' '
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101
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102 # Read model definitions
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103 offsets = unpack('<%s' % ('I' * nb_models), file.read(4 * nb_models))
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104 for offset in offsets:
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105 model = Model()
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106 file.seek(offset)
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107
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108 # Read model header
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109 id_, unknown, x, y, z, width, height, depth = unpack('<HHffffff', file.read(28))
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110 model.unknown = unknown
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111 model.bounding_box = x, y, z, width, height, depth #TODO: check
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112
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113 # Read model quads
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114 while True:
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115 unknown, size = unpack('<HH', file.read(4))
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116 if unknown == 0xffff:
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117 break
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118 if size != 0x1c:
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119 raise Exception #TODO
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120 script_index, x, y, z, width, height = unpack('<Hxxfffff', file.read(24))
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121 model.quads.append((script_index, x, y, z, width, height))
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122 stage.models.append(model)
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123
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124
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125 # Read object usages
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126 file.seek(object_instances_offset)
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127 while True:
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128 obj_id, unknown, x, y, z = unpack('<HHfff', file.read(16))
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129 if (obj_id, unknown) == (0xffff, 0xffff):
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130 break
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131 if unknown != 256:
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132 raise Exception #TODO
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133 stage.object_instances.append((obj_id, x, y, z))
0
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134
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135
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136 # Read other funny things (script)
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137 file.seek(script_offset)
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138 while True:
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139 frame, opcode, size = unpack('<IHH', file.read(8))
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140 if (frame, opcode, size) == (0xffffffff, 0xffff, 0xffff):
0
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141 break
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142 if size != 0x0c:
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143 raise Exception #TODO
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144 data = file.read(size)
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145 if opcode in cls._instructions:
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146 args = unpack('<%s' % cls._instructions[opcode][0], data)
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147 else:
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148 args = (data,)
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149 logger.warn('unknown opcode %d', opcode)
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150 stage.script.append((frame, opcode, args))
0
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151
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152 return stage
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153
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154
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155 def write(self, file):
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156 """Write to a Stage Definition file."""
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157 model_offsets = []
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158 second_section_offset = 0
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159 third_section_offset = 0
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160
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161 nb_faces = sum(len(model.quads) for model in self.models)
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162
204
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163 # Write header (offsets, number of quads, name and background musics)
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164 file.write(pack('<HH', len(self.models), nb_faces))
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165 file.write(pack('<II', 0, 0))
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166 file.write(pack('<I', 0))
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167 file.write(pack('<128s', self.name.encode('shift_jis')))
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168 for bgm_name, bgm_path in self.bgms:
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169 file.write(pack('<128s', bgm_name.encode('shift_jis')))
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170 for bgm_name, bgm_path in self.bgms:
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171 file.write(pack('<128s', bgm_path.encode('ascii')))
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172 file.write(b'\x00\x00\x00\x00' * len(self.models))
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173
204
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174 # Write first section (models)
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175 for i, model in enumerate(self.models):
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176 model_offsets.append(file.tell())
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177 file.write(pack('<HHffffff', i, model.unknown, *model.bounding_box))
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178 for quad in model.quads:
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179 file.write(pack('<HH', 0x00, 0x1c))
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180 file.write(pack('<Hxxfffff', *quad))
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181 file.write(pack('<HH', 0xffff, 4))
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182
204
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183 # Write second section (object instances)
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184 second_section_offset = file.tell()
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185 for obj_id, x, y, z in self.object_instances:
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186 file.write(pack('<HHfff', obj_id, 256, x, y, z))
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187 file.write(b'\xff' * 16)
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188
204
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189 # Write third section (script)
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190 third_section_offset = file.tell()
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191 for frame, opcode, args in self.script:
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192 size = calcsize(self._instructions[opcode][0])
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193 file.write(pack('<IHH%s' % self._instructions[opcode][0], frame, opcode, size, *args))
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194 file.write(b'\xff' * 20)
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195
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196 # Fix offsets
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197 file.seek(4)
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198 file.write(pack('<II', second_section_offset, third_section_offset))
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199 file.seek(16+128+128*2*4)
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200 file.write(pack('<%sI' % len(self.models), *model_offsets))
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201