add many_glyphs example

Cargo.toml

@@ -1451,6 +1451,16 @@ description = "Loads an animated fox model and spawns lots of them. Good for tes
 category = "Stress Tests"
 wasm = true
 
+[[example]]
+name = "many_glyphs"
+path = "examples/stress_tests/many_glyphs.rs"
+
+[package.metadata.example.many_glyphs]
+name = "Many Glyphs"
+description = "Simple benchmark to test text rendering."
+category = "Stress Tests"
+wasm = true
+
 [[example]]
 name = "many_lights"
 path = "examples/stress_tests/many_lights.rs"

examples/README.md

@@ -297,6 +297,7 @@ Example | Description
 [Many Buttons](../examples/stress_tests/many_buttons.rs) | Test rendering of many UI elements
 [Many Cubes](../examples/stress_tests/many_cubes.rs) | Simple benchmark to test per-entity draw overhead. Run with the `sphere` argument to test frustum culling
 [Many Foxes](../examples/stress_tests/many_foxes.rs) | Loads an animated fox model and spawns lots of them. Good for testing skinned mesh performance. Takes an unsigned integer argument for the number of foxes to spawn. Defaults to 1000
+[Many Glyphs](../examples/stress_tests/many_glyphs.rs) | Simple text rendering benchmark.
 [Many Lights](../examples/stress_tests/many_lights.rs) | Simple benchmark to test rendering many point lights. Run with `WGPU_SETTINGS_PRIO=webgl2` to restrict to uniform buffers and max 256 lights
 [Many Sprites](../examples/stress_tests/many_sprites.rs) | Displays many sprites in a grid arrangement! Used for performance testing. Use `--colored` to enable color tinted sprites.
 [Transform Hierarchy](../examples/stress_tests/transform_hierarchy.rs) | Various test cases for hierarchy and transform propagation performance

examples/stress_tests/many_glyphs.rs

@@ -0,0 +1,68 @@
+use bevy::{
+    diagnostic::{FrameTimeDiagnosticsPlugin, LogDiagnosticsPlugin},
+    prelude::*,
+    window::{PresentMode, WindowPlugin}, text::BreakLineOn,
+};
+
+const GLYPH_COUNT: usize = 100_000;
+
+/// This example shows what happens when there is a lot of buttons on screen.
+fn main() {
+    App::new()
+        .add_plugins(DefaultPlugins.set(WindowPlugin {
+            primary_window: Some(Window {
+                present_mode: PresentMode::Immediate,
+                ..default()
+            }),
+            ..default()
+        }))
+        .add_plugin(FrameTimeDiagnosticsPlugin::default())
+        .add_plugin(LogDiagnosticsPlugin::default())
+        .add_startup_system(setup)
+        .run();
+}
+
+fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
+    let font = asset_server.load("fonts/FiraSans-Bold.ttf");
+    let mut text_sections = vec![];
+    for i in 0..GLYPH_COUNT {
+        let section = TextSection {
+            value: (i % 10).to_string(),
+            style: TextStyle {
+                font: font.clone(),
+                font_size: 8.,
+                color: Color::WHITE,
+                ..Default::default()
+            }
+        };
+        text_sections.push(section);
+    }
+    commands.spawn(Camera2dBundle::default());
+    commands
+        .spawn(NodeBundle {
+            style: Style {
+                size: Size::all(Val::Px(1050.)),
+                align_items: AlignItems::Center,
+                justify_content: JustifyContent::Center,
+                ..default()
+            },
+            ..default()
+        })
+        .with_children(|commands| {
+            commands.spawn(TextBundle {
+                text: Text {
+                    sections: text_sections,
+                    alignment: TextAlignment::Left,
+                    linebreak_behaviour: BreakLineOn::AnyCharacter,
+                    ..Default::default()
+                },
+                style: Style {
+                    size: Size::all(Val::Px(1050.)),
+                    ..Default::default()
+                },
+                background_color: Color::MAROON.into(),
+                ..Default::default()
+            });
+        });
+}
+