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annotate src/th06/std.rs @ 703:81232dac8136

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ecl: simplify parsing with more combinators.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Fri, 23 Aug 2019 17:37:22 +0200
parents ef2dbd676a91
children 377c241be559
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rev   line source
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1 //! STD background format support.
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2
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3 use nom::{
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4 IResult,
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5 bytes::complete::{tag, take_while_m_n},
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6 number::complete::{le_u8, le_u16, le_u32, le_i32, le_f32},
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7 sequence::tuple,
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8 combinator::map,
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9 };
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10 use encoding_rs::SHIFT_JIS;
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11 use std::collections::HashMap;
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12
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13 /// A float position in the 3D space.
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14 #[derive(Debug, Clone)]
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15 pub struct Position {
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16 /// X component.
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17 pub x: f32,
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18
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19 /// Y component.
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20 pub y: f32,
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21
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22 /// Z component.
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23 pub z: f32,
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24 }
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25
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26 /// A 3D box around something.
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27 #[derive(Debug, Clone)]
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28 struct Box3D {
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29 width: f32,
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30 height: f32,
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31 depth: f32,
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32 }
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33
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34 /// A 2D box around something.
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35 #[derive(Debug, Clone)]
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36 pub struct Box2D {
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37 /// Width.
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38 pub width: f32,
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39
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40 /// Height.
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41 pub height: f32,
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42 }
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43
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44 /// A quad in the 3D space.
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45 #[derive(Debug, Clone)]
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46 pub struct Quad {
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47 /// The anm script to run for this quad.
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48 pub anm_script: u16,
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49
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50 /// The position of this quad in the 3D space.
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51 pub pos: Position,
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52
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53 /// The size of this quad.
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54 pub size_override: Box2D,
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55 }
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56
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57 /// A model formed of multiple quads in space.
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58 #[derive(Debug, Clone)]
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59 pub struct Model {
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60 /// TODO: find what that is.
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61 pub unknown: u16,
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62
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63 /// The bounding box around this model.
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64 pub bounding_box: [f32; 6],
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65
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66 /// The quads composing this model.
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67 pub quads: Vec<Quad>,
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68 }
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69
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70 /// An instance of a model.
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71 #[derive(Debug, Clone)]
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72 pub struct Instance {
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73 /// The instance identifier.
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74 pub id: u16,
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75
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76 /// Where to position the instance of this model.
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77 pub pos: Position,
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78 }
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79
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80 /// A single instruction, part of a `Script`.
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81 #[derive(Debug, Clone)]
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82 pub struct Call {
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83 /// Time at which this instruction will be called.
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84 pub time: u32,
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85
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86 /// The instruction to call.
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87 pub instr: Instruction,
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88 }
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89
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90 /// Parse a SHIFT_JIS byte string of length 128 into a String.
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91 pub fn le_String(i: &[u8]) -> IResult<&[u8], String> {
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92 let data = i.splitn(2, |c| *c == b'\0').nth(0).unwrap();
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93 let (string, encoding, replaced) = SHIFT_JIS.decode(data);
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94 Ok((&i[128..], string.into_owned()))
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95 }
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96
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97 /// Main struct of the STD stage format.
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98 #[derive(Debug, Clone)]
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99 pub struct Stage {
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100 /// The name of the stage.
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101 pub name: String,
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102
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103 /// A list of (name, path) of background music.
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104 // TODO: there are maximum four of them, and in practice never more than 2.
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105 pub musics: Vec<Option<(String, String)>>,
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106
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107 /// List of models.
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108 pub models: Vec<Model>,
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109
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110 /// List of instances.
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111 pub instances: Vec<Instance>,
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112
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113 /// List of instructions in the script.
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114 pub script: Vec<Call>,
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115 }
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116
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117 impl Stage {
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118 /// Parse a slice of bytes into an `Stage` struct.
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119 pub fn from_slice(data: &[u8]) -> IResult<&[u8], Stage> {
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120 parse_stage(data)
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121 }
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122 }
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123
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124 macro_rules! declare_stage_instructions {
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125 ($($opcode:tt => fn $name:ident($($arg:ident: $arg_type:ident),*)),*,) => {
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126 /// Available instructions in an `Stage`.
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127 #[allow(missing_docs)]
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128 #[derive(Debug, Clone, Copy)]
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129 pub enum Instruction {
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130 $(
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131 $name($($arg_type),*)
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132 ),*
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133 }
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134
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135 fn parse_instruction_args(input: &[u8], opcode: u16) -> IResult<&[u8], Instruction> {
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136 let mut i = &input[..];
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137 let instr = match opcode {
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138 $(
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139 $opcode => {
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140 $(
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141 let (i2, $arg) = concat_idents!(le_, $arg_type)(i)?;
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142 i = i2;
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143 )*
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144 Instruction::$name($($arg),*)
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145 }
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146 )*
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147 _ => unreachable!()
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148 };
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149 Ok((i, instr))
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150 }
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151 };
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152 }
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153
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154 declare_stage_instructions!{
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155 0 => fn SetViewpos(x: f32, y: f32, z: f32),
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156 1 => fn SetFog(r: u8, g: u8, b: u8, a: u8, near: f32, far: f32),
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157 2 => fn SetViewpos2(x: f32, y: f32, z: f32),
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158 3 => fn StartInterpolatingViewpos2(frame: i32, _unused: i32, _unused: i32),
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159 4 => fn StartInterpolatingFog(frame: i32, _unused: i32, _unused: i32),
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160 5 => fn Unknown(_unused: i32, _unused: i32, _unused: i32),
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161 }
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162
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163 fn parse_stage(input: &[u8]) -> IResult<&[u8], Stage> {
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164 let start_offset = 0;
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165 let i = &input[start_offset..];
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166 let (i, (num_models, num_faces, object_instances_offset, script_offset, _)) = tuple((le_u16, le_u16, le_u32, le_u32, tag(b"\0\0\0\0")))(i)?;
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167 let object_instances_offset = object_instances_offset as usize;
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168 let script_offset = script_offset as usize;
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169
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170 let (i, name) = le_String(i)?;
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171 let (i, music_names) = map(tuple((le_String, le_String, le_String, le_String)), |(a, b, c, d)| [a, b, c, d])(i)?;
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172 let (mut i, music_paths) = map(tuple((le_String, le_String, le_String, le_String)), |(a, b, c, d)| [a, b, c, d])(i)?;
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173 let musics = music_names.iter().zip(&music_paths).map(|(name, path)| if name == " " { None } else { Some((name.clone(), path.clone())) }).collect();
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174
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175 let mut offsets = vec![];
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176 for _ in 0..num_models {
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177 let (i2, offset) = le_u32(i)?;
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178 offsets.push(offset as usize);
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179 i = i2;
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180 }
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181
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182 // Read model definitions.
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183 let mut models = vec![];
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184 for offset in offsets {
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185 let i = &input[offset..];
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186 let (mut i, (id, unknown, x, y, z, width, height, depth)) = tuple((le_u16, le_u16, le_f32, le_f32, le_f32, le_f32, le_f32, le_f32))(i)?;
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187 let bounding_box = [x, y, z, width, height, depth];
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188 let mut quads = vec![];
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189 loop {
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190 let (i2, (unk1, size)) = tuple((le_u16, le_u16))(i)?;
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191 if unk1 == 0xffff {
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192 break;
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193 }
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194 assert_eq!(size, 0x1c);
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195 let (i2, (anm_script, _, x, y, z, width, height)) = tuple((le_u16, tag(b"\0\0"), le_f32, le_f32, le_f32, le_f32, le_f32))(i2)?;
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196 let quad = Quad {
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197 anm_script,
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198 pos: Position { x, y, z },
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199 size_override: Box2D { width, height },
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200 };
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201 quads.push(quad);
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202 i = i2;
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203 }
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204 let model = Model {
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205 unknown,
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206 bounding_box,
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207 quads,
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208 };
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209 models.push(model);
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210 }
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211
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212 // Read object usage.
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213 let mut instances = vec![];
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214 let mut i = &input[object_instances_offset..];
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215 loop {
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216 let (i2, (id, unknown, x, y, z)) = tuple((le_u16, le_u16, le_f32, le_f32, le_f32))(i)?;
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217 if id == 0xffff && unknown == 0xffff {
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218 break;
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219 }
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220 assert_eq!(unknown, 0x100);
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221 let instance = Instance {
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222 id,
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223 pos: Position { x, y, z },
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224 };
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225 instances.push(instance);
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226 i = i2;
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227 }
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228
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229 // Read the script.
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230 let mut script = vec![];
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231 let mut i = &input[script_offset..];
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232 loop {
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233 let (i2, (time, opcode, size)) = tuple((le_u32, le_u16, le_u16))(i)?;
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234 if time == 0xffffffff && opcode == 0xffff && size == 0xffff {
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235 break;
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236 }
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237 assert_eq!(size, 12);
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238 let data = &i2[..12];
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239 let (data, instr) = parse_instruction_args(data, opcode)?;
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240 assert_eq!(data.len(), 0);
679
6020e33d4fc4 Implement a .std renderer, and its associated VM.
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241 println!("{} {:?}", time, instr);
671
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242 script.push(Call { time, instr });
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243 i = &i2[12..];
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244 }
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245
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246 let stage = Stage {
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247 name,
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248 musics,
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249 models,
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250 instances,
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251 script,
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252 };
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253 Ok((b"", stage))
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254 }
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255
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256 #[cfg(test)]
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257 mod tests {
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258 use super::*;
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259 use std::io::{self, Read};
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260 use std::fs::File;
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261
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262 #[test]
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263 fn std() {
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264 let file = File::open("EoSD/ST/stage1.std").unwrap();
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265 let mut file = io::BufReader::new(file);
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266 let mut buf = vec![];
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267 file.read_to_end(&mut buf).unwrap();
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268 let (_, stage) = Stage::from_slice(&buf).unwrap();
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269 assert_eq!(stage.name, "夢幻夜行絵巻　～ Mystic Flier");
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270 assert_eq!(stage.musics.len(), 4);
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271 assert_eq!(stage.models.len(), 13);
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272 assert_eq!(stage.instances.len(), 90);
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273 assert_eq!(stage.script.len(), 21);
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274 }
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275 }