# Objective
currently if we use an image with the wrong sampler type in a material,
wgpu panics with an invalid texture format. turn this into a warning and
fail more gracefully.
## Solution
the expected sampler type is specified in the AsBindGroup derive, so we
can just check the image sampler is what it should be.
i am not totally sure about the mapping of image sampler type to
#[sampler(type)], i assumed:
```
"filtering" => [ TextureSampleType::Float { filterable: true } ],
"non_filtering" => [
TextureSampleType::Float { filterable: false },
TextureSampleType::Sint,
TextureSampleType::Uint,
],
"comparison" => [ TextureSampleType::Depth ],
```
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|---|---|---|
| .. | ||
| layout | ||
| render | ||
| widget | ||
| accessibility.rs | ||
| focus.rs | ||
| geometry.rs | ||
| lib.rs | ||
| measurement.rs | ||
| node_bundles.rs | ||
| picking_backend.rs | ||
| stack.rs | ||
| texture_slice.rs | ||
| ui_material.rs | ||
| ui_node.rs | ||
| update.rs | ||