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use crate::{
asset_protocols::font::FontAsset,
components::text_instance::{HaTextElement, HaTextInstance},
material::domains::surface::SurfaceTextDomain,
math::*,
mesh::{
geometry::{
Geometry, GeometryPrimitives, GeometryTriangle, GeometryVertices,
GeometryVerticesColumn,
},
vertex_factory::StaticVertexFactory,
MeshError,
},
};
struct TextGlyph {
character: char,
page: usize,
position: Vec2,
uvs: Rect,
size: Vec2,
color: Rgba,
outline: Rgba,
// thickness: f32,
cursive_shift: f32,
baseline: f32,
}
#[derive(Debug, Copy, Clone)]
pub struct SurfaceTextFactory;
impl SurfaceTextFactory {
pub fn geometry(
text: &HaTextInstance,
font: &FontAsset,
meta: bool,
) -> Result<Geometry, MeshError> {
let count = text.glyphs_count();
let bounds_width = text.bounds_width().unwrap_or(f32::INFINITY);
let bounds_height = text.bounds_height().unwrap_or(f32::INFINITY);
let extra_y = text.lines_extra_space();
let mut line_cache = Vec::<TextGlyph>::with_capacity(count);
let mut lines = Vec::with_capacity(text.lines_count());
let mut x = 0.0;
let mut y = 0.0;
let mut width = text.bounds_width().unwrap_or(0.0);
let mut height = text.bounds_height().unwrap_or(0.0);
let mut line_width: f32 = 0.0;
let mut line_height: f32 = 0.0;
let mut line_base: f32 = 0.0;
macro_rules! move_to_new_line {
(@push) => {
{
for glyph in &mut line_cache {
glyph.position.y += line_base - glyph.baseline;
}
lines.push((
line_width,
std::mem::replace(&mut line_cache, Vec::with_capacity(count)),
));
y += line_height;
height = height.max(y);
}
};
(@reset) => {
{
x = 0.0;
line_width = 0.0;
line_height = 0.0;
line_base = 0.0;
}
};
() => {
{
move_to_new_line!(@push);
move_to_new_line!(@reset)
}
};
}
for element in text.iter() {
match element {
HaTextElement::Invalid => {}
HaTextElement::NewLine => {
move_to_new_line!();
}
HaTextElement::Glyph {
character,
size,
color,
outline,
// thickness,
cursive,
..
} => {
if let Some(c) = font.characters.get(&character) {
if let Some((page_size, _)) = font.pages_image_assets.get(c.page) {
let scale = size / font.line_height as f32;
let xadvance = c.line_advance * scale;
let yadvance = (font.line_height as f32 + extra_y) * scale;
if x + xadvance > bounds_width {
move_to_new_line!();
// TODO: use wrapping to break lines: `wrapping.can_wrap(character)`
}
if x + xadvance > bounds_width || y + yadvance > bounds_height {
break;
}
let baseline = (font.line_base as f32 + extra_y) * scale;
let size = c.image_size * scale;
let offset = c.offset * scale;
let cursive_shift = yadvance * cursive;
line_height = line_height.max(yadvance);
line_cache.push(TextGlyph {
character,
page: c.page as _,
position: Vec2::new(x, y) + offset,
uvs: Rect::new(
c.image_location.x / page_size.x,
c.image_location.y / page_size.y,
c.image_size.x / page_size.x,
c.image_size.y / page_size.y,
),
size,
color,
outline,
// thickness,
cursive_shift,
baseline,
});
x += xadvance;
line_width = line_width.max(x);
width = width.max(line_width);
line_base = line_base.max(baseline);
}
}
}
}
}
move_to_new_line!(@push);
let yalign = (height - y) * text.alignment().y;
let xpivot = width * text.pivot().x;
let ypivot = height * text.pivot().y;
for (line_width, line) in &mut lines {
let xalign = (width - *line_width) * text.alignment().x;
for glyph in line {
glyph.position.x += xalign - xpivot;
glyph.position.y += yalign - ypivot;
}
}
Ok(Geometry::new(
GeometryVertices::default().with_columns([
GeometryVerticesColumn::new(
"position",
lines
.iter()
.flat_map(|(_, glyphs)| glyphs)
.flat_map(|glyph| {
[
Vec2::new(glyph.position.x + glyph.cursive_shift, glyph.position.y),
Vec2::new(
glyph.position.x + glyph.size.x + glyph.cursive_shift,
glyph.position.y,
),
Vec2::new(
glyph.position.x + glyph.size.x - glyph.cursive_shift,
glyph.position.y + glyph.size.y,
),
Vec2::new(
glyph.position.x - glyph.cursive_shift,
glyph.position.y + glyph.size.y,
),
]
})
.collect(),
),
GeometryVerticesColumn::new(
"textureCoord",
lines
.iter()
.flat_map(|(_, glyphs)| glyphs)
.flat_map(|glyph| {
[
Vec3::new(glyph.uvs.x, glyph.uvs.y, glyph.page as _),
Vec3::new(glyph.uvs.x + glyph.uvs.w, glyph.uvs.y, glyph.page as _),
Vec3::new(
glyph.uvs.x + glyph.uvs.w,
glyph.uvs.y + glyph.uvs.h,
glyph.page as _,
),
Vec3::new(glyph.uvs.x, glyph.uvs.y + glyph.uvs.h, glyph.page as _),
]
})
.collect(),
),
GeometryVerticesColumn::new(
"color",
lines
.iter()
.flat_map(|(_, glyphs)| glyphs)
.flat_map(|glyph| {
[
Vec4::from(glyph.color),
Vec4::from(glyph.color),
Vec4::from(glyph.color),
Vec4::from(glyph.color),
]
})
.collect(),
),
GeometryVerticesColumn::new(
"outline",
lines
.iter()
.flat_map(|(_, glyphs)| glyphs)
.flat_map(|glyph| {
[
Vec4::from(glyph.outline),
Vec4::from(glyph.outline),
Vec4::from(glyph.outline),
Vec4::from(glyph.outline),
]
})
.collect(),
),
])?,
GeometryPrimitives::triangles(
lines
.iter()
.flat_map(|(_, glyphs)| glyphs)
.enumerate()
.flat_map(|(index, glyph)| {
let i = index * 4;
let mut a = GeometryTriangle::new([i, i + 1, i + 2]);
let mut b = GeometryTriangle::new([i + 2, i + 3, i]);
if meta {
a.attributes.set("index", index as i32);
b.attributes.set("index", index as i32);
a.attributes.set("character", glyph.character.to_string());
b.attributes.set("character", glyph.character.to_string());
}
[a, b]
})
.collect::<Vec<_>>(),
),
))
}
pub fn factory<T>(
text: &HaTextInstance,
font: &FontAsset,
) -> Result<StaticVertexFactory, MeshError>
where
T: SurfaceTextDomain,
{
Self::geometry(text, font, false)?.factory::<T>()
}
}