Update wgpu to 0.13

[expenses]

This should only be merged when a new wgpu release is made

I'm using the git version of naga and currently egui-wgpu panics during shader processing with that because it expects a different syntax for decorations, so I needed to make these changes to get it to work.

[emilk]

Is there a guide of different wgsl versions you could link to? It would be good to stick that in the egui.wgsl file as a guide to further changes!

[expenses]

Is there a guide of different wgsl versions you could link to? It would be good to stick that in the egui.wgsl file as a guide to further changes!

Not as far as I'm aware. The latest change was 10 days ago and thing seem to move pretty quickly: gpuweb/gpuweb#2652.

[emilk]

Running this locally on my mac I get:

2022-05-27T08:08:43.837956Z  INFO wgpu_core::instance: Adapter Metal AdapterInfo { name: "Apple M1 Pro", vendor: 0, device: 0, device_type: DiscreteGpu, backend: Metal }    
2022-05-27T08:08:43.849075Z ERROR wgpu::backend::direct: Handling wgpu errors as fatal by default    
thread 'main' panicked at 'wgpu error: Validation Error

Caused by:
    In Device::create_shader_module
      note: label = `egui_shader`
    
Shader 'egui_shader' parsing error: expected field name or a closing curly bracket to signify the end of the struct, found '@'
  ┌─ wgsl:4:5
  │
4 │     @location(0) tex_coord: vec2<f32>,
  │     ^ expected field name or a closing curly bracket to signify the end of the struct


    expected field name or a closing curly bracket to signify the end of the struct, found '@'

', /Users/emilk/.cargo/registry/src/github.com-1ecc6299db9ec823/wgpu-0.12.0/src/backend/direct.rs:2273:5

[expenses]

@emilk These changes are in preparation for the next wgpu release which should bump naga.

[expenses]

I've updated this to the latest wgpu master.

gfx-rs/wgpu#2808 and gfx-rs/wgpu#2808 include some breaking changes so I've modified both the shader and cpu code as a result.

[expenses]

@emilk this should be mergeable now!

[expenses]

Utgh, I also need to update the syntax in the wgpu demo app: https://github.com/emilk/egui/blob/master/egui_demo_app/src/apps/custom3d_wgpu_shader.wgsl

Unfortunately, I don't know how to test this as the demo app seems pretty hardcoded to use glow at the moment, and I'm not invested enough to change this.

[expenses]

Utgh, I also need to update the syntax in the wgpu demo app: https://github.com/emilk/egui/blob/master/egui_demo_app/src/apps/custom3d_wgpu_shader.wgsl

I've done that via checking it with the naga binary. Haven't tested the code though.

[emilk]

the demo app seems pretty hardcoded to use glow at the moment

Not at all! (cd egui_demo_app && cargo r --features wgpu)

I tested, and it works!

[emilk]

Thank you!