1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
//! `texture NAME WxH`: seeded noise drawn with a ramp of palette keys.
use super::lex::{Node, Token};
use super::sprite::{Body, SpriteDef};
use super::{Header, Parsed, Parser, check_name, size};
use crate::sprite::Layer;
use crate::{Dither, ErrorCode, Noise, Palette, Sprite};
impl<'a> Parser<'a, '_> {
pub(super) fn texture(&mut self, node: &Node<'a>) -> Parsed<()> {
let mut header = Header::new(node, "texture")?;
let size_token = *header.args.first().ok_or_else(|| {
header
.name
.end_error("Expected the texture's size, such as `16x16`".to_owned())
})?;
if let Some(extra) = header.args.get(1) {
return Err(extra.error(
ErrorCode::Syntax,
format!("Unexpected `{}` after the texture's size", extra.text),
));
}
let (width, height) = size(size_token, self.limits.max_sprite_side)?;
let palette = header.option("palette");
if let Some(palette) = palette {
check_name(palette)?;
}
let seed = match header.option("seed") {
Some(t) => t
.text
.parse::<u64>()
.ok()
.filter(|_| t.text.bytes().all(|b| b.is_ascii_digit()))
.ok_or_else(|| {
t.error(
ErrorCode::InvalidArgument,
format!(
"A seed is a whole number 0..={}, not `{}`",
u64::MAX,
t.text
),
)
})?,
None => 0,
};
let name = header.name;
let lint = header.option("lint");
header.finish("texture", "`palette=`, `seed=` or `lint=`")?;
self.lint_option(crate::lint::Kind::Sprite, name, lint)?;
let mut noise: Option<Noise> = None;
let mut ramp: Option<Vec<Token<'a>>> = None;
let mut dither: Option<Dither> = None;
for child in &node.children {
let tokens = &child.line.tokens;
let keyword = tokens[0];
if let Some(grandchild) = child.children.first() {
return Err(grandchild
.line
.first()
.error(ErrorCode::Syntax, "Unexpected indented line"));
}
let duplicate = match keyword.text {
"noise" => noise.is_some(),
"ramp" => ramp.is_some(),
"dither" => dither.is_some(),
_ => false,
};
if duplicate {
return Err(keyword.error(
ErrorCode::DuplicateName,
format!("`{}` is given twice", keyword.text),
));
}
match keyword.text {
"noise" => {
let mut cell = None;
let mut octaves = 1;
let mut roughness = 50;
for &t in &tokens[1..] {
let (key, value) = t.text.split_once('=').ok_or_else(|| {
t.error(
ErrorCode::Syntax,
format!(
"Expected `cell=`, `octaves=` or `roughness=`, not `{}`",
t.text
),
)
})?;
let value_token = Token {
text: value,
pos: t.at(key.chars().count() + 1),
};
let number = value
.parse::<u32>()
.ok()
.filter(|_| value.bytes().all(|b| b.is_ascii_digit()))
.ok_or_else(|| {
value_token.error(
ErrorCode::Syntax,
format!("Expected a whole number, not `{value}`"),
)
})?;
match key {
"cell" => cell = Some((number, value_token)),
"octaves" => octaves = number,
"roughness" => roughness = number,
_ => {
return Err(t.error(
ErrorCode::Syntax,
format!("Unknown noise option `{key}`; expected `cell=`, `octaves=` or `roughness=`"),
));
}
}
}
let (cell, cell_token) = cell.ok_or_else(|| {
keyword.end_error(
"Noise needs `cell=N`, the pixels between its lattice points"
.to_owned(),
)
})?;
let candidate = Noise {
width,
height,
cell,
octaves,
roughness,
seed,
};
candidate
.check()
.map_err(|e| cell_token.error(e.code, e.message))?;
noise = Some(candidate);
}
"ramp" => {
if tokens.len() < 2 {
return Err(keyword.end_error(
"A ramp needs palette keys, from low noise to high".to_owned(),
));
}
for t in &tokens[1..] {
if t.text.chars().count() != 1 {
return Err(t.error(
ErrorCode::Syntax,
format!(
"A ramp lists palette keys one by one, with spaces, not `{}`",
t.text
),
));
}
}
ramp = Some(tokens[1..].to_vec());
}
"dither" => {
let value = *tokens.get(1).ok_or_else(|| {
keyword
.end_error("Expected `none`, `bayer2`, `bayer4` or `bayer8`".to_owned())
})?;
if let Some(extra) = tokens.get(2) {
return Err(
extra.error(ErrorCode::Syntax, format!("Unexpected `{}`", extra.text))
);
}
dither = Some(match value.text {
"none" => Dither::None,
"bayer2" => Dither::Bayer(2),
"bayer4" => Dither::Bayer(4),
"bayer8" => Dither::Bayer(8),
other => {
return Err(value.error(
ErrorCode::Syntax,
format!(
"Expected `none`, `bayer2`, `bayer4` or `bayer8`, not `{other}`"
),
));
}
});
}
other => {
return Err(keyword.error(
ErrorCode::Syntax,
format!(
"Unknown texture line `{other}`; expected `noise`, `ramp` or `dither`"
),
));
}
}
}
let noise = noise.ok_or_else(|| {
name.error(
ErrorCode::Syntax,
format!("Texture `{}` needs a `noise` line", name.text),
)
})?;
let ramp = ramp.ok_or_else(|| {
name.error(
ErrorCode::Syntax,
format!("Texture `{}` needs a `ramp` line", name.text),
)
})?;
self.sprites.push(SpriteDef {
name,
slice: None,
body: Body::Texture {
palette,
noise,
ramp,
dither: dither.unwrap_or_default(),
},
});
Ok(())
}
/// Draws a texture whose ramp keys are checked against its palette.
pub(super) fn texture_sprite(
&mut self,
name: Token,
palette: Option<Token>,
noise: &Noise,
ramp: &[Token],
dither: Dither,
palettes: &[Palette],
) -> Option<(Sprite, usize)> {
let palette = self.sprite_palette(name, palette, palettes)?;
let mut keys = Vec::with_capacity(ramp.len());
for t in ramp {
let key = t.text.chars().next().unwrap_or(' ');
if palette.color(key).is_none() {
self.errors.push(t.error(
ErrorCode::UnknownName,
format!("Key `{key}` is not in palette `{}`", palette.name),
));
return None;
}
keys.push(key);
}
let values = noise.stretched();
let mut pixels = Vec::with_capacity(values.len());
for (i, &value) in values.iter().enumerate() {
let (x, y) = (i as u32 % noise.width, i as u32 / noise.width);
pixels.push(keys[dither.pick(value, x, y, keys.len())]);
}
Some((
Sprite {
name: name.text.to_owned(),
width: noise.width,
height: noise.height,
palette: palette.clone(),
layers: vec![Layer {
text: false,
name: None,
keys: pixels,
palette: None,
}],
slice: None,
},
0,
))
}
}