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Why not OpenCL or OpenGL? You'll not be constrained by the flavor of GPU.

Sounds like you've never actually tried running those two APis across platforms?

if you want portable use WebGPU either via wgpu for rust or dawn for C++ They actually do run on Windows, Linux, Mac, iOS, and Android portably

wgpu Just Works from C++ as well. Both projects implement the webgpu.h API