Update wgpu to 0.19

crates/eframe/Cargo.toml

@@ -92,7 +92,15 @@
 ]
 
 ## Use [`wgpu`](https://docs.rs/wgpu) for painting (via [`egui-wgpu`](https://github.com/emilk/egui/tree/master/crates/egui-wgpu)).
+##
 ## This overrides the `glow` feature.
+##
+## If you're targetting the web, you also need to turn on the
+## `webgl` and/or `webgpu` features of the `wgpu` crate.
+## If you turn on both, eframe will prefer WebGPU and fall back on WebGL:
+## ```
+## wgpu = { version = "*", features = ["webgpu", "webgl"] }
+## ```
 wgpu = ["dep:wgpu", "dep:egui-wgpu", "dep:pollster", "dep:raw-window-handle"]
 
 ## Enables compiling for x11.

crates/egui_demo_app/Cargo.toml

@@ -57,7 +57,7 @@ log = { version = "0.4", features = ["std"] }
 bytemuck = { version = "1.7.1", optional = true }
 puffin = { version = "0.18", optional = true }
 puffin_http = { version = "0.15", optional = true }
-# Enable both webgl & webgpu for targeting the web (these features have no effect when not targeting wasm32)
+# Enable both WebGL & WebGPU when targeting the web (these features have no effect when not targeting wasm32)
 wgpu = { workspace = true, features = ["webgpu", "webgl"], optional = true }