Update wgpu to 0.19 (#3824)

* Closes https://github.com/emilk/egui/issues/3675

---------

Co-authored-by: Andreas Reich <r_andreas2@web.de>
Co-authored-by: Mingun <Alexander_Sergey@mail.ru>

scripts/build_demo_web.sh

@@ -18,7 +18,7 @@ OPEN=false
 OPTIMIZE=false
 BUILD=debug
 BUILD_FLAGS=""
-WEB_GPU=false
+WGPU=false
 WASM_OPT_FLAGS="-O2 --fast-math"
 
 while test $# -gt 0; do
@@ -34,15 +34,15 @@ while test $# -gt 0; do
       echo "  --release: Build with --release, and then run wasm-opt."
       echo "             NOTE: --release also removes debug symbols, unless you also use -g."
       echo ""
-      echo "  --webgpu:  Build a binary for WebGPU instead of WebGL."
-      echo "             Note that the resulting wasm will ONLY work on browsers with WebGPU."
+      echo "  --wgpu:    Build a binary using wgpu instead of glow/webgl."
+      echo "             The resulting binary will automatically use WebGPU if available and"
+      echo "             fall back to a WebGL emulation layer otherwise."
       exit 0
       ;;
 
     -g)
       shift
       WASM_OPT_FLAGS="${WASM_OPT_FLAGS} -g"
-      echo "'${WASM_OPT_FLAGS}'"
       ;;
 
     --open)
@@ -57,9 +57,9 @@ while test $# -gt 0; do
       BUILD_FLAGS="--release"
       ;;
 
-    --webgpu)
+    --wgpu)
       shift
-      WEB_GPU=true
+      WGPU=true
       ;;
 
     *)
@@ -71,7 +71,7 @@ done
 
 OUT_FILE_NAME="egui_demo_app"
 
-if [[ "${WEB_GPU}" == true ]]; then
+if [[ "${WGPU}" == true ]]; then
   FEATURES="${FEATURES},wgpu"
 else
   FEATURES="${FEATURES},glow"
@@ -87,6 +87,7 @@ echo "Building rust…"
 (cd crates/$CRATE_NAME &&
   cargo build \
     ${BUILD_FLAGS} \
+    --quiet \
     --lib \
     --target wasm32-unknown-unknown \
     --no-default-features \