Early UI work.

examples/wayland_wgpu_demo/Cargo.toml

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+[package]
+name = "ruin_ui_wayland_demo"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+ruin_ui = { path = "../../lib/ui" }
+ruin_ui_platform_wayland = { path = "../../lib/ui_platform_wayland" }
+ruin_ui_renderer_wgpu = { path = "../../lib/ui_renderer_wgpu" }

examples/wayland_wgpu_demo/src/main.rs

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+use std::error::Error;
+
+use ruin_ui::{Color, Rect, SceneSnapshot, UiSize, WindowSpec};
+use ruin_ui_platform_wayland::WaylandWindow;
+use ruin_ui_renderer_wgpu::{RenderError, WgpuSceneRenderer};
+
+fn build_demo_scene() -> SceneSnapshot {
+    let mut scene = SceneSnapshot::new(1, UiSize::new(800.0, 500.0));
+    scene.push_quad(
+        Rect::new(0.0, 0.0, 800.0, 500.0),
+        Color::rgb(0x10, 0x14, 0x24),
+    );
+    scene.push_quad(
+        Rect::new(32.0, 32.0, 736.0, 72.0),
+        Color::rgb(0x2D, 0x3E, 0x68),
+    );
+    scene.push_quad(
+        Rect::new(32.0, 136.0, 352.0, 300.0),
+        Color::rgb(0x6A, 0x3D, 0x3D),
+    );
+    scene.push_quad(
+        Rect::new(416.0, 136.0, 352.0, 300.0),
+        Color::rgb(0x3A, 0x5E, 0x49),
+    );
+    scene
+}
+
+fn main() -> Result<(), Box<dyn Error>> {
+    let scene = build_demo_scene();
+    let mut window = WaylandWindow::open(
+        WindowSpec::new("RUIN Wayland / wgpu demo")
+            .app_id("dev.ruin.prototype")
+            .requested_inner_size(scene.logical_size),
+    )?;
+    let mut renderer = WgpuSceneRenderer::new(
+        window.surface_target(),
+        scene.logical_size.width as u32,
+        scene.logical_size.height as u32,
+    )?;
+
+    println!("Opening RUIN Wayland / wgpu demo window...");
+    while window.is_running() {
+        window.dispatch()?;
+        if let Some(frame) = window.prepare_frame() {
+            if frame.resized {
+                renderer.resize(frame.width, frame.height);
+            }
+            match renderer.render(&scene) {
+                Ok(()) => {}
+                Err(RenderError::Lost | RenderError::Outdated) => {
+                    renderer.resize(frame.width, frame.height);
+                    window.request_redraw();
+                }
+                Err(RenderError::Timeout | RenderError::Occluded | RenderError::Validation) => {
+                    window.request_redraw();
+                }
+            }
+        }
+    }
+
+    Ok(())
+}