diff --git a/Cargo.toml b/Cargo.toml
index 7958bd98a..b9d820c1e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,5 +1,6 @@
 [workspace]
 members = [
+	"player",
 	"wgpu-core",
     "wgpu-types",
 ]
diff --git a/player/Cargo.toml b/player/Cargo.toml
new file mode 100644
index 000000000..aa51b5652
--- /dev/null
+++ b/player/Cargo.toml
@@ -0,0 +1,32 @@
+[package]
+name = "player"
+version = "0.1.0"
+authors = [
+	"Dzmitry Malyshau <kvark@mozilla.com>",
+]
+edition = "2018"
+description = "WebGPU trace player"
+homepage = "https://github.com/gfx-rs/wgpu"
+repository = "https://github.com/gfx-rs/wgpu"
+keywords = ["graphics"]
+license = "MPL-2.0"
+publish = false
+
+[features]
+
+[dependencies]
+env_logger = "0.7"
+ron = { version = "0.5" }
+winit = { version = "0.22" }
+
+[dependencies.wgt]
+path = "../wgpu-types"
+package = "wgpu-types"
+version = "0.5"
+features = ["replay"]
+
+[dependencies.wgc]
+path = "../wgpu-core"
+package = "wgpu-core"
+version = "0.5"
+features = ["replay", "raw-window-handle"]
diff --git a/player/src/main.rs b/player/src/main.rs
new file mode 100644
index 000000000..65329259d
--- /dev/null
+++ b/player/src/main.rs
@@ -0,0 +1,121 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use wgc::device::trace;
+
+use std::{
+    fmt::Debug,
+    fs::File,
+    marker::PhantomData,
+    path::{Path, PathBuf},
+};
+use winit::{event_loop::EventLoop, window::WindowBuilder};
+
+macro_rules! gfx_select {
+    ($id:expr => $global:ident.$method:ident( $($param:expr),+ )) => {
+        match $id.backend() {
+            #[cfg(not(any(target_os = "ios", target_os = "macos")))]
+            wgt::Backend::Vulkan => $global.$method::<wgc::backend::Vulkan>( $($param),+ ),
+            #[cfg(any(target_os = "ios", target_os = "macos"))]
+            wgt::Backend::Metal => $global.$method::<wgc::backend::Metal>( $($param),+ ),
+            #[cfg(windows)]
+            wgt::Backend::Dx12 => $global.$method::<wgc::backend::Dx12>( $($param),+ ),
+            #[cfg(windows)]
+            wgt::Backend::Dx11 => $global.$method::<wgc::backend::Dx11>( $($param),+ ),
+            _ => unreachable!()
+        }
+    };
+}
+
+#[derive(Debug)]
+struct IdentityPassThrough<I>(PhantomData<I>);
+
+impl<I: Clone + Debug + wgc::id::TypedId> wgc::hub::IdentityHandler<I> for IdentityPassThrough<I> {
+    type Input = I;
+    fn process(&self, id: I, backend: wgt::Backend) -> I {
+        let (index, epoch, _backend) = id.unzip();
+        I::zip(index, epoch, backend)
+    }
+    fn free(&self, _id: I) {}
+}
+
+struct IdentityPassThroughFactory;
+
+impl<I: Clone + Debug + wgc::id::TypedId> wgc::hub::IdentityHandlerFactory<I>
+    for IdentityPassThroughFactory
+{
+    type Filter = IdentityPassThrough<I>;
+    fn spawn(&self, _min_index: u32) -> Self::Filter {
+        IdentityPassThrough(PhantomData)
+    }
+}
+impl wgc::hub::GlobalIdentityHandlerFactory for IdentityPassThroughFactory {}
+
+fn main() {
+    env_logger::init();
+
+    let folder = match std::env::args().nth(1) {
+        Some(arg) if Path::new(&arg).is_dir() => PathBuf::from(arg),
+        _ => panic!("Provide the folder path as the parameter"),
+    };
+
+    let file = File::open(folder.join(trace::FILE_NAME)).unwrap();
+    let actions: Vec<trace::Action> = ron::de::from_reader(file).unwrap();
+
+    let event_loop = EventLoop::new();
+    let mut builder = WindowBuilder::new();
+    builder = builder.with_title("wgpu player");
+    let window = builder.build(&event_loop).unwrap();
+
+    let global = wgc::hub::Global::new("player", IdentityPassThroughFactory);
+    let mut surface_id_manager = wgc::hub::IdentityManager::from_index(1);
+    let mut adapter_id_manager = wgc::hub::IdentityManager::default();
+    let mut device_id_manager = wgc::hub::IdentityManager::default();
+
+    let (_size, surface) = {
+        let size = window.inner_size();
+        let id = surface_id_manager.alloc(wgt::Backend::Empty);
+        let surface = global.instance_create_surface(&window, id);
+        (size, surface)
+    };
+
+    let adapter = global
+        .pick_adapter(
+            &wgc::instance::RequestAdapterOptions {
+                power_preference: wgt::PowerPreference::Default,
+                compatible_surface: Some(surface),
+            },
+            wgc::instance::AdapterInputs::IdSet(
+                &vec![
+                    adapter_id_manager.alloc(wgt::Backend::Vulkan),
+                    adapter_id_manager.alloc(wgt::Backend::Dx12),
+                    adapter_id_manager.alloc(wgt::Backend::Metal),
+                ],
+                |id| wgc::id::TypedId::unzip(*id).2,
+            ),
+        )
+        .unwrap();
+
+    let limits = match actions.first() {
+        Some(&trace::Action::Init { ref limits }) => limits.clone(),
+        other => panic!("Unsupported first action: {:?}", other),
+    };
+
+    let device = gfx_select!(adapter => global.adapter_request_device(
+        adapter,
+        &wgt::DeviceDescriptor {
+            extensions: wgt::Extensions {
+                anisotropic_filtering: false,
+            },
+            limits,
+        },
+        device_id_manager.alloc(wgt::Backend::Vulkan)
+    ));
+
+    for action in actions.into_iter().skip(1) {
+        match action {
+            _ => {}
+        }
+    }
+}
diff --git a/wgpu-core/Cargo.toml b/wgpu-core/Cargo.toml
index c6ad0c832..49e0497ec 100644
--- a/wgpu-core/Cargo.toml
+++ b/wgpu-core/Cargo.toml
@@ -34,6 +34,7 @@ gfx-descriptor = "0.1"
 gfx-memory = "0.1"
 parking_lot = "0.10"
 peek-poke = "0.2"
+raw-window-handle = { version = "0.3", optional = true }
 ron = { version = "0.5", optional = true }
 serde = { version = "1.0", features = ["serde_derive"], optional = true }
 smallvec = "1"
diff --git a/wgpu-core/src/command/compute.rs b/wgpu-core/src/command/compute.rs
index ea6e87d78..8d35b9493 100644
--- a/wgpu-core/src/command/compute.rs
+++ b/wgpu-core/src/command/compute.rs
@@ -28,7 +28,7 @@ enum PipelineState {
 #[derive(Clone, Copy, Debug, PeekPoke)]
 #[cfg_attr(feature = "trace", derive(serde::Serialize))]
 #[cfg_attr(feature = "replay", derive(serde::Deserialize))]
-pub(crate) enum ComputeCommand {
+pub enum ComputeCommand {
     SetBindGroup {
         index: u8,
         num_dynamic_offsets: u8,
diff --git a/wgpu-core/src/command/mod.rs b/wgpu-core/src/command/mod.rs
index cf82f972a..1716bf69b 100644
--- a/wgpu-core/src/command/mod.rs
+++ b/wgpu-core/src/command/mod.rs
@@ -27,7 +27,7 @@ use peek_poke::PeekPoke;
 use std::{marker::PhantomData, mem, ptr, slice, thread::ThreadId};
 
 #[derive(Clone, Copy, Debug, PeekPoke)]
-pub(crate) struct PhantomSlice<T>(PhantomData<T>);
+pub struct PhantomSlice<T>(PhantomData<T>);
 
 impl<T> Default for PhantomSlice<T> {
     fn default() -> Self {
diff --git a/wgpu-core/src/command/render.rs b/wgpu-core/src/command/render.rs
index e74138f53..6c8b0222d 100644
--- a/wgpu-core/src/command/render.rs
+++ b/wgpu-core/src/command/render.rs
@@ -58,7 +58,7 @@ pub struct Rect<T> {
 #[derive(Clone, Copy, Debug, PeekPoke)]
 #[cfg_attr(feature = "trace", derive(serde::Serialize))]
 #[cfg_attr(feature = "replay", derive(serde::Deserialize))]
-pub(crate) enum RenderCommand {
+pub enum RenderCommand {
     SetBindGroup {
         index: u8,
         num_dynamic_offsets: u8,
diff --git a/wgpu-core/src/device/mod.rs b/wgpu-core/src/device/mod.rs
index 981988c60..5bd78afbe 100644
--- a/wgpu-core/src/device/mod.rs
+++ b/wgpu-core/src/device/mod.rs
@@ -31,8 +31,8 @@ use std::{
 };
 
 mod life;
-#[cfg(feature = "trace")]
-pub(crate) mod trace;
+#[cfg(any(feature = "trace", feature = "replay"))]
+pub mod trace;
 #[cfg(feature = "trace")]
 use trace::{Action, Trace};
 
diff --git a/wgpu-core/src/device/trace.rs b/wgpu-core/src/device/trace.rs
index d0a594b17..c8a82f956 100644
--- a/wgpu-core/src/device/trace.rs
+++ b/wgpu-core/src/device/trace.rs
@@ -6,12 +6,19 @@ use crate::{
     command::{BufferCopyView, TextureCopyView},
     id,
 };
-use std::{io::Write as _, ops::Range};
+use std::ops::Range;
+#[cfg(feature = "trace")]
+use std::io::Write as _;
 
 //TODO: consider a readable Id that doesn't include the backend
+
 type FileName = String;
 
-#[derive(serde::Serialize)]
+pub const FILE_NAME: &str = "trace.ron";
+
+#[derive(Debug)]
+#[cfg_attr(feature = "trace", derive(serde::Serialize))]
+#[cfg_attr(feature = "replay", derive(serde::Deserialize))]
 pub enum BindingResource {
     Buffer {
         id: id::BufferId,
@@ -22,8 +29,10 @@ pub enum BindingResource {
     TextureView(id::TextureViewId),
 }
 
-#[derive(serde::Serialize)]
-pub(crate) enum Action {
+#[derive(Debug)]
+#[cfg_attr(feature = "trace", derive(serde::Serialize))]
+#[cfg_attr(feature = "replay", derive(serde::Deserialize))]
+pub enum Action {
     Init {
         limits: wgt::Limits,
     },
@@ -88,8 +97,10 @@ pub(crate) enum Action {
     Submit(Vec<Command>),
 }
 
-#[derive(Debug, serde::Serialize)]
-pub(crate) enum Command {
+#[derive(Debug)]
+#[cfg_attr(feature = "trace", derive(serde::Serialize))]
+#[cfg_attr(feature = "replay", derive(serde::Deserialize))]
+pub enum Command {
     CopyBufferToBuffer {
         src: id::BufferId,
         src_offset: wgt::BufferAddress,
@@ -124,6 +135,7 @@ pub(crate) enum Command {
     },
 }
 
+#[cfg(feature = "trace")]
 #[derive(Debug)]
 pub struct Trace {
     path: std::path::PathBuf,
@@ -132,10 +144,11 @@ pub struct Trace {
     binary_id: usize,
 }
 
+#[cfg(feature = "trace")]
 impl Trace {
     pub fn new(path: &std::path::Path) -> Result<Self, std::io::Error> {
         log::info!("Tracing into '{:?}'", path);
-        let mut file = std::fs::File::create(path.join("trace.ron"))?;
+        let mut file = std::fs::File::create(path.join(FILE_NAME))?;
         file.write(b"[\n")?;
         Ok(Trace {
             path: path.to_path_buf(),
@@ -164,6 +177,7 @@ impl Trace {
     }
 }
 
+#[cfg(feature = "trace")]
 impl Drop for Trace {
     fn drop(&mut self) {
         let _ = self.file.write(b"]");
diff --git a/wgpu-core/src/hub.rs b/wgpu-core/src/hub.rs
index 2d1ef24a5..5b806558f 100644
--- a/wgpu-core/src/hub.rs
+++ b/wgpu-core/src/hub.rs
@@ -25,7 +25,7 @@ use wgt::Backend;
 
 #[cfg(debug_assertions)]
 use std::cell::Cell;
-use std::{fmt::Debug, iter, marker::PhantomData, ops};
+use std::{fmt::Debug, marker::PhantomData, ops};
 
 /// A simple structure to manage identities of objects.
 #[derive(Debug)]
@@ -44,6 +44,13 @@ impl Default for IdentityManager {
 }
 
 impl IdentityManager {
+    pub fn from_index(min_index: u32) -> Self {
+        IdentityManager {
+            free: (0 .. min_index).collect(),
+            epochs: vec![1; min_index as usize],
+        }
+    }
+
     pub fn alloc<I: TypedId>(&mut self, backend: Backend) -> I {
         match self.free.pop() {
             Some(index) => I::zip(index, self.epochs[index as usize], backend),
@@ -262,10 +269,7 @@ pub struct IdentityManagerFactory;
 impl<I: TypedId + Debug> IdentityHandlerFactory<I> for IdentityManagerFactory {
     type Filter = Mutex<IdentityManager>;
     fn spawn(&self, min_index: Index) -> Self::Filter {
-        let mut man = IdentityManager::default();
-        man.free.extend(0..min_index);
-        man.epochs.extend(iter::repeat(1).take(min_index as usize));
-        Mutex::new(man)
+        Mutex::new(IdentityManager::from_index(min_index))
     }
 }
 
@@ -549,6 +553,7 @@ impl<G: GlobalIdentityHandlerFactory> Global<G> {
 
 impl<G: GlobalIdentityHandlerFactory> Drop for Global<G> {
     fn drop(&mut self) {
+        log::info!("Dropping Global");
         // destroy surfaces
         for (_, (surface, _)) in self.surfaces.data.write().map.drain() {
             self.instance.destroy_surface(surface);
diff --git a/wgpu-core/src/instance.rs b/wgpu-core/src/instance.rs
index 8346472ce..0995ef65e 100644
--- a/wgpu-core/src/instance.rs
+++ b/wgpu-core/src/instance.rs
@@ -188,7 +188,7 @@ impl From<HalDeviceType> for DeviceType {
 
 pub enum AdapterInputs<'a, I> {
     IdSet(&'a [I], fn(&I) -> Backend),
-    Mask(BackendBit, fn() -> I),
+    Mask(BackendBit, fn(Backend) -> I),
 }
 
 impl<I: Clone> AdapterInputs<'_, I> {
@@ -197,7 +197,7 @@ impl<I: Clone> AdapterInputs<'_, I> {
             AdapterInputs::IdSet(ids, ref fun) => ids.iter().find(|id| fun(id) == b).cloned(),
             AdapterInputs::Mask(bits, ref fun) => {
                 if bits.contains(b.into()) {
-                    Some(fun())
+                    Some(fun(b))
                 } else {
                     None
                 }
@@ -207,6 +207,85 @@ impl<I: Clone> AdapterInputs<'_, I> {
 }
 
 impl<G: GlobalIdentityHandlerFactory> Global<G> {
+    #[cfg(feature = "raw-window-handle")]
+    pub fn instance_create_surface<W: raw_window_handle::HasRawWindowHandle>(
+        &self,
+        window: &W,
+        id_in: Input<G, SurfaceId>,
+    ) -> SurfaceId {
+        use raw_window_handle::RawWindowHandle as Rwh;
+
+        let surface = match window.raw_window_handle() {
+            #[cfg(target_os = "ios")]
+            Rwh::IOS(h) => Surface {
+                #[cfg(feature = "gfx-backend-vulkan")]
+                vulkan: None,
+                metal: self
+                    .instance
+                    .metal
+                    .create_surface_from_uiview(h.ui_view, cfg!(debug_assertions)),
+            },
+            #[cfg(target_os = "macos")]
+            Rwh::MacOS(h) => {
+                //TODO: figure out when this is needed, and how to get that without `objc`
+                //use objc::{msg_send, runtime::Object, sel, sel_impl};
+                //let ns_view = if h.ns_view.is_null() {
+                //    let ns_window = h.ns_window as *mut Object;
+                //    unsafe { msg_send![ns_window, contentView] }
+                //} else {
+                //    h.ns_view
+                //};
+                Surface {
+                    #[cfg(feature = "gfx-backend-vulkan")]
+                    vulkan: self
+                        .instance
+                        .vulkan
+                        .as_ref()
+                        .map(|inst| inst.create_surface_from_ns_view(h.ns_view)),
+                    metal: self
+                        .instance
+                        .metal
+                        .create_surface_from_nsview(h.ns_view, cfg!(debug_assertions)),
+                }
+            }
+            #[cfg(all(unix, not(target_os = "ios"), not(target_os = "macos")))]
+            Rwh::Xlib(h) => Surface {
+                vulkan: self
+                    .instance
+                    .vulkan
+                    .as_ref()
+                    .map(|inst| inst.create_surface_from_xlib(h.display as _, h.window as _)),
+            },
+            #[cfg(all(unix, not(target_os = "ios"), not(target_os = "macos")))]
+            Rwh::Wayland(h) => Surface {
+                vulkan: self
+                    .instance
+                    .vulkan
+                    .as_ref()
+                    .map(|inst| inst.create_surface_from_wayland(h.display, h.surface)),
+            },
+            #[cfg(windows)]
+            Rwh::Windows(h) => Surface {
+                vulkan: self
+                    .instance
+                    .vulkan
+                    .as_ref()
+                    .map(|inst| inst.create_surface_from_hwnd(std::ptr::null_mut(), h.hwnd)),
+                dx12: self
+                    .instance
+                    .dx12
+                    .as_ref()
+                    .map(|inst| inst.create_surface_from_hwnd(h.hwnd)),
+                dx11: self.instance.dx11.create_surface_from_hwnd(h.hwnd),
+            },
+            _ => panic!("Unsupported window handle"),
+        };
+
+        let mut token = Token::root();
+        self.surfaces
+            .register_identity(id_in, surface, &mut token)
+    }
+
     pub fn enumerate_adapters(&self, inputs: AdapterInputs<Input<G, AdapterId>>) -> Vec<AdapterId> {
         let instance = &self.instance;
         let mut token = Token::root();