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//! `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,
}],
slice: None,
},
0,
))
}
}