Depth buffer with wgpu

[wrnrlr]

I want to use a depth buffer on the wgpu backend. For this I've added a DepthStencilState to the RenderPipelineDescriptor of my pipeline. I should also be able to add a RenderPassDepthStencilAttachment to the render pass. However I can't find how to do this with the egui_wgpu::CallbackFn. The paint callback already has a render_pass configured but I need to add something like this:

depth_stencil_attachment: Some(wgpu::RenderPassDepthStencilAttachment {
        view: &self.depth_texture.view,
        depth_ops: Some(wgpu::Operations {
            load: wgpu::LoadOp::Clear(1.0),
            store: true,
        }),
        stencil_ops: None,
    }),

How can I do this?

[wrnrlr]

Got the answer, add this option:

eframe::NativeOptions {
         // ...
        depth_buffer: 1,
        #[cfg(feature = "wgpu")] renderer: eframe::Renderer::Wgpu,
        ..Default::default()
    };

[H4JUN]

@wrnrlr
I think I am also having the same issue. I am trying to add RenderPassDepthStencilAttachment to the render_pass, but the render_pass is passed as it is to the paint function in CallbackTrait.

Do you mind explaining more about how adding to the options that you mentioned as an answer allows you to attach DepthStencilAttachment to the render pass?

[LioQing]

I found it, the depth_buffer and stencil_buffer have to be in one the following supported values by wgpu:

egui/crates/egui-wgpu/src/lib.rs

Lines 372 to 382 in e1f5d68

	pub fn depth_format_from_bits(depth_buffer: u8, stencil_buffer: u8) -> Option<wgpu::TextureFormat> {
	match (depth_buffer, stencil_buffer) {
	(0, 8) => Some(wgpu::TextureFormat::Stencil8),
	(16, 0) => Some(wgpu::TextureFormat::Depth16Unorm),
	(24, 0) => Some(wgpu::TextureFormat::Depth24Plus),
	(24, 8) => Some(wgpu::TextureFormat::Depth24PlusStencil8),
	(32, 0) => Some(wgpu::TextureFormat::Depth32Float),
	(32, 8) => Some(wgpu::TextureFormat::Depth32FloatStencil8),
	_ => None,
	}
	}

Also remember to set the depth_stencil field of RenderPipelineDescriptor.