• Vulkan has maxSamplerAllocationCount (min 4000, see "Required Limits"). See values in practice.
• DX12 has a newish D3D12_FEATURE_DATA_D3D12_OPTIONS19.MaxSamplerDescriptorHeapSize (which must be at least 2048 due to "Maximum number of Samplers in all descriptor tables per shader stage" being 2048 as well on tier 2+ hardware). See values in practice.
• Does Metal have a limit (cc @mwyrzykowski)? I couldn't find one but I haven't tried creating a bunch of samplers to see what happens.

wgpu deduplicates samplers on creation but the limits can still be reached due to lodMinClamp/lodMaxClamp being floating-point numbers.

What should happen when implementations reach those limits?
Some options I see:

1. Lose the device.
2. Return an OOM (even if it's not a true out of memory).
3. Add a new limit and require implementations to dededuplicate.