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Showing content from https://github.com/gfx-rs/gfx/issues/1376 below:

[ll] Descriptor heaps · Issue #1376 · gfx-rs/gfx · GitHub

vkDescriptorPool can be mapped to an indirect argument buffer of Metal. However, D3D12 model is much different:

• ID3D12DescriptorHeap can only store CBV/SRV/UAV, or samplers, or RTV, or DSV. Mixing is not allowed.
• only one heap of each type can be active (bound to ID3D12CommandList) at any given time.

Current approach:

• have both heaps and pools, allocated on those heaps
• pool on D3D12 is just a slice of the heap
• a heap on Vulkan is nothing

This works, but it's an unfortunate derail from Vulkan API. It would be great to not expose heaps directly and map from Vulkan.

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