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annotate src/th06/std.rs @ 679:6020e33d4fc4

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Implement a .std renderer, and its associated VM.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Fri, 16 Aug 2019 13:40:38 +0200
parents 266911c0ccfd
children ef2dbd676a91
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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: f32,
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38 height: f32,
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39 }
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40
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41 /// A quad in the 3D space.
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42 #[derive(Debug, Clone)]
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43 pub struct Quad {
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44 /// The anm script to run for this quad.
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45 pub anm_script: u16,
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46
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47 /// The position of this quad in the 3D space.
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48 pub pos: Position,
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49
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50 /// The size of this quad.
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51 pub size_override: Box2D,
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52 }
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53
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54 /// A model formed of multiple quads in space.
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55 #[derive(Debug, Clone)]
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56 pub struct Model {
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57 /// TODO: find what that is.
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58 pub unknown: u16,
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59
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60 /// The bounding box around this model.
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61 pub bounding_box: [f32; 6],
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62
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63 /// The quads composing this model.
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64 pub quads: Vec<Quad>,
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65 }
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66
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67 /// An instance of a model.
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68 #[derive(Debug, Clone)]
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69 pub struct Instance {
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70 /// The instance identifier.
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71 pub id: u16,
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72
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73 /// Where to position the instance of this model.
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74 pub pos: Position,
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75 }
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76
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77 /// A single instruction, part of a `Script`.
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78 #[derive(Debug, Clone)]
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79 pub struct Call {
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80 /// Time at which this instruction will be called.
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81 pub time: u32,
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82
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83 /// The instruction to call.
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84 pub instr: Instruction,
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85 }
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86
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87 /// Parse a SHIFT_JIS byte string of length 128 into a String.
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88 pub fn le_String(i: &[u8]) -> IResult<&[u8], String> {
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89 let data = i.splitn(2, |c| *c == b'\0').nth(0).unwrap();
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90 let (string, encoding, replaced) = SHIFT_JIS.decode(data);
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91 Ok((&i[128..], string.into_owned()))
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92 }
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93
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94 /// Main struct of the STD stage format.
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95 #[derive(Debug, Clone)]
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96 pub struct Stage {
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97 /// The name of the stage.
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98 pub name: String,
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99
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100 /// A list of (name, path) of background music.
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101 // TODO: there are maximum four of them, and in practice never more than 2.
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102 pub musics: Vec<Option<(String, String)>>,
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103
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104 /// List of models.
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105 pub models: Vec<Model>,
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106
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107 /// List of instances.
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108 pub instances: Vec<Instance>,
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109
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110 /// List of instructions in the script.
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111 pub script: Vec<Call>,
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112 }
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113
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114 impl Stage {
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115 /// Parse a slice of bytes into an `Stage` struct.
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116 pub fn from_slice(data: &[u8]) -> IResult<&[u8], Stage> {
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117 parse_stage(data)
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118 }
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119 }
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120
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121 macro_rules! declare_stage_instructions {
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122 ($($opcode:tt => fn $name:ident($($arg:ident: $arg_type:ident),*)),*,) => {
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123 /// Available instructions in an `Stage`.
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124 #[allow(missing_docs)]
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125 #[derive(Debug, Clone, Copy)]
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126 pub enum Instruction {
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127 $(
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128 $name($($arg_type),*)
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129 ),*
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130 }
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131
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132 fn parse_instruction_args(input: &[u8], opcode: u16) -> IResult<&[u8], Instruction> {
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133 let mut i = &input[..];
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134 let instr = match opcode {
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135 $(
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136 $opcode => {
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137 $(
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138 let (i2, $arg) = concat_idents!(le_, $arg_type)(i)?;
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139 i = i2;
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140 )*
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141 Instruction::$name($($arg),*)
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142 }
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143 )*
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144 _ => unreachable!()
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145 };
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146 Ok((i, instr))
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147 }
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148 };
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149 }
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150
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151 declare_stage_instructions!{
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152 0 => fn SetViewpos(x: f32, y: f32, z: f32),
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153 1 => fn SetFog(r: u8, g: u8, b: u8, a: u8, near: f32, far: f32),
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154 2 => fn SetViewpos2(x: f32, y: f32, z: f32),
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155 3 => fn StartInterpolatingViewpos2(frame: i32, _unused: i32, _unused: i32),
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156 4 => fn StartInterpolatingFog(frame: i32, _unused: i32, _unused: i32),
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157 5 => fn Unknown(_unused: i32, _unused: i32, _unused: i32),
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158 }
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159
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160 fn parse_stage(input: &[u8]) -> IResult<&[u8], Stage> {
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161 let start_offset = 0;
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162 let i = &input[start_offset..];
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163 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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164 let object_instances_offset = object_instances_offset as usize;
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165 let script_offset = script_offset as usize;
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166
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167 let (i, name) = le_String(i)?;
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168 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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169 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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170 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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171
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172 let mut offsets = vec![];
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173 for _ in 0..num_models {
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174 let (i2, offset) = le_u32(i)?;
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175 offsets.push(offset as usize);
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176 i = i2;
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177 }
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178
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179 // Read model definitions.
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180 let mut models = vec![];
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181 for offset in offsets {
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182 let i = &input[offset..];
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183 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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184 let bounding_box = [x, y, z, width, height, depth];
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185 let mut quads = vec![];
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186 loop {
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187 let (i2, (unk1, size)) = tuple((le_u16, le_u16))(i)?;
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188 if unk1 == 0xffff {
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189 break;
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190 }
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191 assert_eq!(size, 0x1c);
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192 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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193 let quad = Quad {
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194 anm_script,
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195 pos: Position { x, y, z },
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196 size_override: Box2D { width, height },
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197 };
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198 quads.push(quad);
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199 i = i2;
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200 }
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201 let model = Model {
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202 unknown,
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203 bounding_box,
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204 quads,
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205 };
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206 models.push(model);
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207 }
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208
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209 // Read object usage.
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210 let mut instances = vec![];
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211 let mut i = &input[object_instances_offset..];
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212 loop {
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213 let (i2, (id, unknown, x, y, z)) = tuple((le_u16, le_u16, le_f32, le_f32, le_f32))(i)?;
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214 if id == 0xffff && unknown == 0xffff {
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215 break;
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216 }
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217 assert_eq!(unknown, 0x100);
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218 let instance = Instance {
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219 id,
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220 pos: Position { x, y, z },
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221 };
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222 instances.push(instance);
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223 i = i2;
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224 }
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225
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226 // Read the script.
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227 let mut script = vec![];
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228 let mut i = &input[script_offset..];
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229 loop {
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230 let (i2, (time, opcode, size)) = tuple((le_u32, le_u16, le_u16))(i)?;
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231 if time == 0xffffffff && opcode == 0xffff && size == 0xffff {
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232 break;
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233 }
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234 assert_eq!(size, 12);
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235 let data = &i2[..12];
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236 let (data, instr) = parse_instruction_args(data, opcode)?;
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237 assert_eq!(data.len(), 0);
679
6020e33d4fc4 Implement a .std renderer, and its associated VM.
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parents: 671
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238 println!("{} {:?}", time, instr);
671
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239 script.push(Call { time, instr });
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240 i = &i2[12..];
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241 }
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242
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243 let stage = Stage {
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244 name,
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245 musics,
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246 models,
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247 instances,
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248 script,
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249 };
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250 Ok((b"", stage))
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251 }
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252
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diff changeset
253 #[cfg(test)]
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254 mod tests {
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255 use super::*;
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256 use std::io::{self, Read};
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257 use std::fs::File;
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258
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259 #[test]
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260 fn std() {
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261 let file = File::open("EoSD/ST/stage1.std").unwrap();
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262 let mut file = io::BufReader::new(file);
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263 let mut buf = vec![];
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264 file.read_to_end(&mut buf).unwrap();
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265 let (_, stage) = Stage::from_slice(&buf).unwrap();
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266 assert_eq!(stage.name, "夢幻夜行絵巻　～ Mystic Flier");
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267 assert_eq!(stage.musics.len(), 4);
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268 assert_eq!(stage.models.len(), 13);
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269 assert_eq!(stage.instances.len(), 90);
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270 assert_eq!(stage.script.len(), 21);
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271 }
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272 }