Fuchsia's Vulkan 1.2 radix sort with CMake support

This is the radix sort implementation from Google's Fuchsia operating system, but in a way that is easier to integrate into CMake codebases. My modifications are in moving the build system to CMake and changes in shader loading (they are compiled into the binary.) You can treat my changes as CC0, so you are just bound by the original LICENSE of this radix sort library.

Below is the original README:

RadixSort/VK

RadixSort/VK is a high-performance sorting library for Vulkan 1.2.

Features include:

• Ultra-fast stable sorting of 32‑bit or 64‑bit keyvals
• Key size is declared at sort time
• Indirectly dispatchable
• Simple to integrate in a Vulkan 1.2 environment

Usage

See radix_sort_vk.h.

Device Support

The following architectures are supported:

Vendor	Architecture	32‑bit Keyvals	64‑bit Keyvals	Notes
NVIDIA	sm_35+	✔	✔
AMD	GCN3+	✔	✔
AMD	RDNA+	✔	✔	64-wide subgroup
ARM	Bifrost4	✔	✔
ARM	Bifrost8	✔	✔
Intel	GEN8+	✔	✔
Intel	Xe+	✔	✔

Benchmarks

NVIDIA GeForce RTX 2060

NVIDIA Quadro K2200

AMD Radeon RX 6600 XT

AMD Radeon RX 560

Intel HD Graphics 615

ARM Mali G52

ARM Mali G31

Future Improvements

• 96-bit and 128-bit keyval support.
• Possibly reduce GMEM transactions by accumulating stores that share the same transaction boundary.

References

• Merrill, Duane and Michael Garland. "Single-pass Parallel Prefix Scan with Decoupled Lookback." (2016).
• Adinets, Andy. "A Faster Radix Sort Implementation." NVIDIA GTC 2020.