mirror of
https://github.com/bevyengine/bevy
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6f7d0e5725
# Objective
Currently text is recomputed unnecessarily on any changes to its color,
which is extremely expensive.
## Solution
Split up `TextStyle` into two separate components `TextFont` and
`TextColor`.
## Testing
I added this system to `many_buttons`:
```rust
fn set_text_colors_changed(mut colors: Query<&mut TextColor>) {
for mut text_color in colors.iter_mut() {
text_color.set_changed();
}
}
```
reports ~4fps on main, ~50fps with this PR.
## Migration Guide
`TextStyle` has been renamed to `TextFont` and its `color` field has
been moved to a separate component named `TextColor` which newtypes
`Color`.
93 lines
2.7 KiB
Rust
93 lines
2.7 KiB
Rust
//! Simple text rendering benchmark.
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//!
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//! Creates a text block with a single span containing `100_000` glyphs,
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//! and renders it with the UI in a white color and with Text2d in a red color.
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//!
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//! To recompute all text each frame run
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//! `cargo run --example many_glyphs --release recompute-text`
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use bevy::{
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color::palettes::basic::RED,
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diagnostic::{FrameTimeDiagnosticsPlugin, LogDiagnosticsPlugin},
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prelude::*,
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text::{LineBreak, TextBounds},
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window::{PresentMode, WindowResolution},
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winit::{UpdateMode, WinitSettings},
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};
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fn main() {
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let mut app = App::new();
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app.add_plugins((
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DefaultPlugins.set(WindowPlugin {
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primary_window: Some(Window {
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present_mode: PresentMode::AutoNoVsync,
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resolution: WindowResolution::new(1920.0, 1080.0).with_scale_factor_override(1.0),
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..default()
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}),
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..default()
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}),
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FrameTimeDiagnosticsPlugin,
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LogDiagnosticsPlugin::default(),
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))
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.insert_resource(WinitSettings {
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focused_mode: UpdateMode::Continuous,
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unfocused_mode: UpdateMode::Continuous,
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})
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.add_systems(Startup, setup);
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if std::env::args().any(|arg| arg == "recompute-text") {
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app.add_systems(Update, force_text_recomputation);
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}
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app.run();
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}
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fn setup(mut commands: Commands) {
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warn!(include_str!("warning_string.txt"));
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commands.spawn(Camera2d);
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let text_string = "0123456789".repeat(10_000);
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let text_font = TextFont {
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font_size: 4.,
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..Default::default()
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};
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let text_block = TextLayout {
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justify: JustifyText::Left,
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linebreak: LineBreak::AnyCharacter,
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};
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commands
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.spawn(NodeBundle {
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style: Style {
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width: Val::Percent(100.),
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align_items: AlignItems::Center,
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justify_content: JustifyContent::Center,
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..default()
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},
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..default()
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})
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.with_children(|commands| {
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commands
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.spawn(NodeBundle {
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style: Style {
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width: Val::Px(1000.),
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..Default::default()
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},
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..Default::default()
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})
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.with_child((Text(text_string.clone()), text_font.clone(), text_block));
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});
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commands.spawn((
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Text2d::new(text_string),
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TextColor(RED.into()),
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bevy::sprite::Anchor::Center,
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TextBounds::new_horizontal(1000.),
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text_block,
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));
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}
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fn force_text_recomputation(mut text_query: Query<&mut TextLayout>) {
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for mut block in &mut text_query {
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block.set_changed();
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}
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}
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