Mip-maps level 1 and above for every layer of a cube texture are stored on layers 4 and 5 only

[AminMoazzen]

I tried various methods (the code from mip-map example too), but when I render the cube texture as skybox, every mip-map beyond level 0 is drawn on layers 4 and 5 (+/-Z faces) of the cube.

This is how I generate mip-maps for every layer:

for layer in 0..6 {
    /* update uniform buffers */
    for mip in 0..max_mip_level {
        let texture_view_desc = wgpu::TextureViewDescriptor {
            label: Some("cubemap_face"),
            format: Some(wgpu::TextureFormat::Rgba16Float),
            dimension: Some(wgpu::TextureViewDimension::D2),
            aspect: wgpu::TextureAspect::All,
            base_mip_level: mip,
            level_count: std::num::NonZeroU32::new(1),
            base_array_layer: layer,
            array_layer_count: None,
        };
        let view = texture.create_view(&texture_view_desc);

        {
            let mut render_pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
                color_attachments: &[wgpu::RenderPassColorAttachmentDescriptor {
                    attachment: &view,
                    resolve_target: None,
                    ops: wgpu::Operations {
                        load: wgpu::LoadOp::Clear(wgpu::Color {
                            r: 0.0,
                            g: 0.0,
                            b: 0.0,
                            a: 1.0,
                        }),
                        store: true,
                    },
                }],
                depth_stencil_attachment: None,
            });
            /* rendering stuff */
        }
    }
}

And this is how I sample it in the shader:

layout(set = 0, binding = 0) uniform textureCube t_Cubemap;
layout(set = 0, binding = 1) uniform sampler s_Cubemap;
  
void main()
{
    vec3 env_color = textureLod(samplerCube(t_Cubemap, s_Cubemap), v_local_pos, 1.2).rgb;

    /* gamma correction */

    f_color = vec4(env_color, 1.0);
}

[kvark]

Thank you for filing! Issues like this should be trivially addressable once we can reproduce.
Do you have a repro case?
What platform are you running on?
You could also record an API trace and attach a ZIP here, see https://github.com/gfx-rs/wgpu/wiki/Debugging-wgpu-Applications#tracing-infrastructure

[AminMoazzen]

I tested it on Windows 10 with Vulkan backend

Here is the API trace (hope I did it right):
trace.zip

How else can I help with reproduction?

[kvark]

Oh, the last thing we'll need to know is what version of wgpu-rs you were using, exactly.

[AminMoazzen]

I'm using version 0.6.0

[kvark]

Looks like we are missing a bit of validation here. Metal complains:

_mtlValidateArgumentsForTextureViewOnDevice:1595: failed assertion `Texture Creation
newSliceRange.length(6) must equal (1) for textureType (MTLTextureType2D).'

Your array_layer_count should be Some(1) to fix this one. I'll hack it in the trace, we'll see if there is more to this.

[kvark]

Works fine on Metal after I patch that. Going to add the validation momentarily...

[AminMoazzen]

Your array_layer_count should be Some(1) to fix this one. I'll hack it in the trace, we'll see if there is more to this.

Yeah this was the problem.
Thank you

[kvark]

PR is coming, going to close this given the resolution now