Experimental WebGL wgpu backend support #1096

pacmancoder · 2021-10-23T09:44:46Z

Made changes to allow the use of WebGL wgpu backend. The basic functionality works, but text rendering is still buggy - Somehow, if the initial value of the text control was changed, some parts of the text start to disappear/show artifacts.

UPD: Strange issue with text rendering is only reproducing in Firefox (v93). It is not directly related to the iced, I created an issue in wgpu_glyph here: hecrj/wgpu_glyph#78

The current implementation provides neither Application nor Sandbox implementations for this backend, and does not implement proper Clipboard in iced_winit, however, this should be at least some starting point.

Changes list:

Added new integration_wgpu_webgl example, based on integration_wgpu and wgpu's hello-triangle example (can't use integration_wgpu example directly because it fails with its spirv shaders on WebGL)
Lifted Sync requirement for Runtime and Tracker in iced_futures
Aded webgl feature to iced_wgpu which enables wgpu/webgl
Created stub implementation for Clipboard in iced_winit

Images

iced running inside WebGL canvas:

Text issues after changing text value:

Same example running on desktop backend:

pacmancoder · 2021-10-23T10:13:43Z

futures/src/runtime.rs

@@ -5,6 +5,50 @@ use crate::{subscription, Executor, Subscription};
 use futures::{channel::mpsc, Sink};
 use std::marker::PhantomData;

+#[cfg(not(target_arch = "wasm32"))]


Instead of duplication of Runtime and Tracker with the different trait bounds, but I thought that such trait aliasing may work better WYT?

pacmancoder · 2021-10-23T17:55:28Z

Opening PR for review, looks like an issue with text rendering is not directly related to iced repo, and reproduces only in Firefox. Created separate issue in wgpu_glyph: hecrj/wgpu_glyph#78

hecrj

Nice! Will take a proper look soon 🎉

Instead of a new example, could we instead change the existing one so it works everywhere?

pacmancoder · 2021-10-24T14:08:35Z

@hecrj Actually yes I will do that, I just need to figure out alternative wgsl shader integration_wgpu example instead of existing spir-v.

pacmancoder · 2021-10-24T18:06:49Z

@hecrj made original integration_wgpu example work WebGL. It does not want to work with spirv shaders, so I created identical shaders in wgsl.

Behold, it is alive 😄!

pacmancoder · 2021-10-24T18:18:59Z

UPD: Just a thing to consider - this example works fine with wgsl shader on desktop backends (at least on Windows, I checked DX and VULKAN backends), so maybe we could remove spir-v shaders from this example and use wgsl on all targets? I was not sure if I can remove this, as it shows to the user that spirv shaders can be used here.

hecrj · 2021-10-25T09:36:42Z

@pacmancoder Yes, I think we can remove the SPIR-V shaders altogether and use wgsl everywhere. It's not up to us to showcase the different features of wgpu. Simpler that way!

pacmancoder · 2021-10-25T10:22:38Z

Removed spir-v shader and fixed code formatting (GH Workflow was failing in cargo fmt)

pacmancoder · 2021-10-28T16:28:10Z

@hecrj is something still blocking this PR before merge?

kaimast · 2021-10-28T16:31:58Z

This is great! I was about to implement the same thing before I found this. I'll take a look now as well and let you know if I find some issues.

kaimast · 2021-10-28T16:35:32Z

winit/src/clipboard.rs

+#[cfg(target_arch = "wasm32")]
+pub struct Clipboard;
+
+#[cfg(target_arch = "wasm32")]


When I tried to get this to work yesterday, I added a "NullClipboard" to window_clipboard instead. We can eventually replace it with proper clipboard support for different wasm environments. I think this is cleaner than having a feature flag here, but not sure what @hecrj prefers.

Can send a pull request if my approach is more descired

hecrj

I took another quick glance and left some more feedback.

I still have to take a proper look and test everything! However, I'm working on a bunch of changes related to rendering and I'd like to finish that first.

hecrj · 2021-10-28T19:07:56Z

futures/src/subscription/tracker.rs

+#[cfg(not(target_arch = "wasm32"))]
+mod trait_aliases {
+    use super::*;
+
+    pub trait TrackerMessage: Send + 'static {}
+
+    impl<T> TrackerMessage for T where T: Send + 'static {}
+
+    pub trait TrackerMessageReceiver<Message: TrackerMessage>:
+        Sink<Message, Error = mpsc::SendError> + Unpin + Send + Clone + 'static
+    {
+    }
+
+    impl<Message: TrackerMessage, T> TrackerMessageReceiver<Message> for T where
+        T: Sink<Message, Error = mpsc::SendError>
+            + Unpin
+            + Send
+            + Clone
+            + 'static
+    {
+    }
+}
+
+#[cfg(target_arch = "wasm32")]
+mod trait_aliases {
+    use super::*;
+
+    pub trait TrackerMessage: 'static {}
+
+    impl<T> TrackerMessage for T where T: 'static {}
+
+    pub trait TrackerMessageReceiver<Message: TrackerMessage>:
+        Sink<Message, Error = mpsc::SendError> + Unpin + Clone + 'static
+    {
+    }
+
+    impl<Message: TrackerMessage, T> TrackerMessageReceiver<Message> for T where
+        T: Sink<Message, Error = mpsc::SendError> + Unpin + Clone + 'static
+    {
+    }
+}
+
+pub use trait_aliases::{TrackerMessage, TrackerMessageReceiver};


Are these necessary? iced_web is able to use the Runtime and, therefore, the Tracker already.

iced/web/src/lib.rs

Lines 170 to 175 in 8a2a7f7

let mut runtime = iced_futures::Runtime::new(

Self::Executor::new().expect("Create executor"),

sender.clone(),

);

let (app, command) = runtime.enter(|| Self::new(flags));

Sadly yes, this is necessary - we use winit here with WebGL backend and it (winit) does not implement Send on its EventLoopProxy on wsam32, so yea, because of that we should lift here requirement for Send for our types too

hecrj · 2021-10-28T19:08:52Z

native/src/subscription.rs

+#[cfg(not(target_arch = "wasm32"))]
+type BoxStream<'a, T> = iced_futures::futures::stream::BoxStream<'a, T>;
+
+#[cfg(target_arch = "wasm32")]
+type BoxStream<'a, T> = iced_futures::futures::stream::LocalBoxStream<'a, T>;


These are already defined in iced_futures!

iced/futures/src/lib.rs

Lines 43 to 69 in 8a2a7f7

/// A boxed static future.

///

/// - On native platforms, it needs a `Send` requirement.

/// - On the Web platform, it does not need a `Send` requirement.

#[cfg(not(target_arch = "wasm32"))]

pub type BoxFuture<T> = futures::future::BoxFuture<'static, T>;

/// A boxed static future.

///

/// - On native platforms, it needs a `Send` requirement.

/// - On the Web platform, it does not need a `Send` requirement.

#[cfg(target_arch = "wasm32")]

pub type BoxFuture<T> = futures::future::LocalBoxFuture<'static, T>;

/// A boxed static stream.

///

/// - On native platforms, it needs a `Send` requirement.

/// - On the Web platform, it does not need a `Send` requirement.

#[cfg(not(target_arch = "wasm32"))]

pub type BoxStream<T> = futures::stream::BoxStream<'static, T>;

/// A boxed static stream.

///

/// - On native platforms, it needs a `Send` requirement.

/// - On the Web platform, it does not need a `Send` requirement.

#[cfg(target_arch = "wasm32")]

pub type BoxStream<T> = futures::stream::LocalBoxStream<'static, T>;

kaimast · 2021-10-29T20:27:30Z

Did you test input with this branch yet? I seem to have a bunch of issues but they are probably caused by winit. See this bug report here: rust-windowing/winit#2036

Problem is that iced still uses a custom winit branch, so it's hard to figure out what's going on is fixed upstream or not.

pacmancoder · 2021-10-30T17:47:59Z

Did you test input with this branch yet? I seem to have a bunch of issues but they are probably caused by winit. See this bug report here: rust-windowing/winit#2036

Problem is that iced still uses a custom winit branch, so it's hard to figure out what's going on is fixed upstream or not.

@kaimast Ah... I see... Sliders in the example were working fine then I just tried to add TextInput to the view and yep, after that, it broke (GUI started to ignore any mouse events to any GUI element). Looks like winit indeed could be broken for wasm32?

cc @hecrj

kaimast · 2022-01-08T19:59:50Z

Could you rebase this on current master? iced has moved to wgpu 0.12 and it would be good to see if some of the issues are resolved.

pacmancoder · 2022-01-09T18:08:41Z

@kaimast sure, I'll try to find som spare time on this week and do the rebase

aentity · 2022-01-15T08:47:56Z

examples/integration_wgpu/src/main.rs

    env_logger::init();

    // Initialize winit
    let event_loop = EventLoop::new();
+
+    #[cfg(target_arch = "wasm32")]
+    let window = winit::window::WindowBuilder::new()


i think you can to save some cfg by doing:

let window = if cfg!(target_arch = "wasm32") { let canvas_element = { console_log::init_with_level(log::Level::Debug) .expect("could not initialize logger"); std::panic::set_hook(Box::new(console_error_panic_hook::hook)); web_sys::window() .and_then(|win| win.document()) .and_then(|doc| doc.get_element_by_id("iced_canvas")) .and_then(|element| element.dyn_into::<HtmlCanvasElement>().ok()) .expect("Canvas with id `iced_canvas` is missing") }; let window = winit::window::WindowBuilder::new() .with_canvas(Some(canvas_element)) .build(&event_loop) .expect("Failed to build winit window") } else { env_logger::init(); winit::window::Window::new(&event_loop).unwrap() };

unless the Window::new() method returns separate types

aentity · 2022-01-15T08:54:28Z

this is very interesting. does this patch allow to run in pure wgpu, without to use html elements for the widget?

kaimast · 2022-01-15T08:55:13Z

this is very interesting. does this patch allow to run in pure wgpu, without to use html elements for the widget?

yes

aentity · 2022-01-15T08:57:39Z

Wow this is great news! To experiment with targetting webgpu, will this approach here block in future to do this? Do we need to add a webgpu feature when/if we try such a thing?

pacmancoder · 2022-01-21T16:30:31Z

@kaimast Welp, I rebased the branch to the latest master (although, some parts of the code not polished yet and need refactoring), however the problems are still here - both input handling and text rendering issues on Firefox are still present.

Unfortunately, I am currently have no time to research this further, If someone still interested in this feature, you are welcome to get this branch and continue work on it

kaimast · 2022-01-23T00:44:02Z

I created a tiny pull request that should fix the input issues. I think it should be close to being merge-able now.

pacmancoder · 2022-01-23T16:48:41Z

Thanks, @kaimast, merged

kaimast · 2022-01-27T20:54:41Z

winit/src/application.rs

@@ -179,7 +178,7 @@ where

    let mut context = task::Context::from_waker(task::noop_waker_ref());

-    event_loop.run_return(move |event, _, control_flow| {
+    event_loop.run(move |event, _, control_flow| {


@hecrj do you think this would break anything? It simplifies the code a lot and the winit docs says about run_return "You are strongly encouraged to use run, unless the use of this is absolutely necessary."

- Added missing `draw_cache_align_4x4` call for `brush_glyph` on wasm32 target - Added WebGL support to `integratio_wgpu` example - Fixed test.yml CI workflow - Removed spir-v shader in `integration_wgpu`; Fixed formatting - Removed redundant `BoxStream` typedef

... and hide the dependency under a `time` module in `iced_native`

It allows to clean up all the `trait_aliases` modules!

hecrj · 2022-01-28T19:28:13Z

I made some changes here! Will explain everything first thing tomorrow!

You can use `trunk serve` to easily compile them!

hecrj

Okay! First of all, thanks for all the efforts here. This is very cool!

As I mentioned yesterday, I made a bunch of changes, some of them quite important.

First, I have removed the iced_web subcrate completely from the repository in 825c774! iced_web has always been quite experimental and their dependencies have been outdated for a while now. Therefore, I believe it's better to move it to a different repository in the iced-rs organization. As a consequence, from now on when targetting Wasm, iced will leverage wgpu and / or glow to render into a canvas using the iced_native crate (see 26d95fd).

In my opinion, this is a better default than iced_web because it makes targetting Wasm quite easier for users. As there are fewer differences between the native stack and the web stack, all of the native widgets should work on Wasm. If you have a native iced application, chances are you can compile it to Wasm! No additional feature flags necessary! Just slap a --target wasm32-unknown-unknown to your cargo build command.

That said, the plan is to still offer iced_web as a separate crate for users that need to leverage the DOM.

The rest of the changes are relatively minor:

I changed the Compositor in iced_wgpu to properly use WebGL limits in 7767241.
I created a new time module that offers a cross-platform Instant implementation in 87b3e03 and 83c649b.
I introduced a MaybeSend trait in iced_futures in 5dab5a3, which allows us to get rid of all the trait_aliases modules.
I have split the iced_futures executor implementations into different backend modules in 167be45. Each backend should expose the same API!
I implemented time::every for the wasm_bindgen backend in e730d97.

Finally, I have added a couple of index.html files to the todos and tour examples. You can try running them on your browser with trunk.

There are still some issues present related to rendering text. My MacBook Pro M1 displays completely mangled text in all of the examples both in Chrome and Firefox:

This seems to happen only to dynamic text, which seems to indicate there may be an issue in the cache upload logic in wgpu_glyph. Most likely related to hecrj/wgpu_glyph#78.

That said, I am pretty happy with the changes here and I think we can merge this! 🎉 We can iron out the issues in future PRs.

m4b · 2022-01-30T04:00:19Z

this is... awesome 😹

pacmancoder commented Oct 23, 2021

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pacmancoder marked this pull request as draft October 23, 2021 10:45

pacmancoder marked this pull request as ready for review October 23, 2021 17:55

hecrj requested changes Oct 24, 2021

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pacmancoder requested a review from hecrj October 24, 2021 18:09

kaimast reviewed Oct 28, 2021

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hecrj requested changes Oct 28, 2021

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pacmancoder requested a review from hecrj October 30, 2021 17:48

kaimast mentioned this pull request Jan 10, 2022

Runing on wasi #1051

Open

aentity reviewed Jan 15, 2022

View reviewed changes

hecrj force-pushed the master branch 2 times, most recently from e6ab610 to 8b0f2e6 Compare January 19, 2022 15:04

kaimast reviewed Jan 27, 2022

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pacmancoder and others added 16 commits January 28, 2022 21:37

Use instant instead of std::instant

9f47ac8

Remove wasm-specific clipboard

9082596

Re-add docs for clipboard

beebf25

Use glow_glyp in opengl_integration example

f3fb00f

Always use event_loop.run

f39147d

Reduce diff

1e3feee

Replace iced_web with WebGL support in wgpu 🎉

825c774

Append Canvas to <body> when targetting Wasm in iced_winit

26d95fd

Use WebGL2 limits for Compositor in iced_wgpu

7767241

Enable instant only for wasm32 targets

87b3e03

... and hide the dependency under a `time` module in `iced_native`

Move time module from iced_native to iced_core

83c649b

Introduce MaybeSend trait in iced_futures

5dab5a3

It allows to clean up all the `trait_aliases` modules!

Split iced_futures into different backend implementations

167be45

Implement time module for wasm-bindgen backend in iced_futures

e730d97

Use MaybeSend in perform and map for Command

90afd1d

Add index.html for todos and tour example

2f57051

You can use `trunk serve` to easily compile them!

hecrj approved these changes Jan 29, 2022

View reviewed changes

Allow Application::run to return on native platforms

6f604ab

hecrj merged commit e4ef29e into iced-rs:master Jan 31, 2022

This was referenced Jan 31, 2022

run/build integration example for wasm #740

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Gate non-wasm32 winit features behind flags. #1178

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hecrj added rendering shell web labels Apr 12, 2022

hecrj added this to the 0.4.0 milestone Apr 12, 2022

hecrj mentioned this pull request May 2, 2022

Release 0.4 — Stateless widgets, component trait, responsive views, WebGL support, and more! #1328

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Experimental WebGL wgpu backend support #1096

Experimental WebGL wgpu backend support #1096

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	let mut runtime = iced_futures::Runtime::new(
	Self::Executor::new().expect("Create executor"),
	sender.clone(),
	);

	let (app, command) = runtime.enter(\|\| Self::new(flags));

	/// A boxed static future.
	///
	/// - On native platforms, it needs a `Send` requirement.
	/// - On the Web platform, it does not need a `Send` requirement.
	#[cfg(not(target_arch = "wasm32"))]
	pub type BoxFuture<T> = futures::future::BoxFuture<'static, T>;

	/// A boxed static future.
	///
	/// - On native platforms, it needs a `Send` requirement.
	/// - On the Web platform, it does not need a `Send` requirement.
	#[cfg(target_arch = "wasm32")]
	pub type BoxFuture<T> = futures::future::LocalBoxFuture<'static, T>;

	/// A boxed static stream.
	///
	/// - On native platforms, it needs a `Send` requirement.
	/// - On the Web platform, it does not need a `Send` requirement.
	#[cfg(not(target_arch = "wasm32"))]
	pub type BoxStream<T> = futures::stream::BoxStream<'static, T>;

	/// A boxed static stream.
	///
	/// - On native platforms, it needs a `Send` requirement.
	/// - On the Web platform, it does not need a `Send` requirement.
	#[cfg(target_arch = "wasm32")]
	pub type BoxStream<T> = futures::stream::LocalBoxStream<'static, T>;

Experimental WebGL wgpu backend support #1096

Experimental WebGL wgpu backend support #1096

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