Trouble rendering in debug mode on macOS.

[5nefarious]

Hello,

I'm trying to write a test program in the bevy engine using wgpu-rs directly (bypassing the existing rendering infrastructure). So far, I've just copied the code from the hello-triangle example and integrated it into the engine. However, when I run the code in debug mode, I get a blank window. The triangle shows up just fine when I run with --release.

I can get the triangle to show up in debug mode if I print the wgpu::Surface (using fmt::Debug) right after it is created, but this seems like odd behavior. I cloned the wgpu-rs repo and was able to run the hello-triangle example successfully in both debug and release modes.

Here's the section of code that I suspect is relevant. I can post more if needed.

impl Renderer {
    pub async fn new(
        instance: &wgpu::Instance,
        window: &Window,
        winit_window: &winit::window::Window,
    ) -> Self {
        let window_id = window.id();
        let surface = unsafe { instance.create_surface(winit_window) };
        let adapter = instance
            .request_adapter(&wgpu::RequestAdapterOptions {
                power_preference: wgpu::PowerPreference::default(),
                compatible_surface: Some(&surface),
            })
            .await
            .expect("Failed to find an appropriate adapter");

        ...

I'm using the Metal backend on macOS 11.2.3. wgpu-rs is at version 0.7 (I can't seem to use master due to a dependency conflict).

[kvark]

Perhaps, you are dropping Surface early? We don't have the logic in place yet to hold it alive for you.

[kvark]

It looks to still be an issue to me. There is nothing in a shader module that needs to be alive after you use it, and you can't use it if you already dropped it. So in no case you'd expect to run into a blank window.
What if you replay the API trace you recorded, does it also show as blank?

[5nefarious]

I just tried running the player, and it throws the following error:

thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Error { code: Message("missing field `max_texture_dimension_1d`"), position: Position { line: 0, col: 0 } }', player/src/bin/play.rs:37:70

[kvark]

you need the wgpu of the same revision as used for recording

[5nefarious]

Okay. So, I tried running the trace, and it seems to work just fine. The triangle shows up every time. Something is different about my code, then. I've pushed what I have so far to GitHub, in case you have time to look at it.

I am currently trying to get a texture to display in the window, but I'm running into the same issue; It only works some of the time. I'm saving the BindGroup, but that doesn't seem to be cutting it.

EDIT: Similarly, when I run the player on the trace for my texture demo, the texture always shows up. Even though I got a blank window when I actually ran the application to produce that trace.

[5nefarious]

For posterity, I opened up an issue here: #816.