VC4CL

Excellent effort. Nvidia has become defacto GPGPU hardware vendor due to CUDA, but I wish it was OpenCL or other general API instead. Even Raspberry Pi's VideoCore has OpenCL support[1]. But a look at HW Acceleration support table at FFmpeg[2] shows why GPGPU Platform API is such a mess. But performance benefits are incredible, using VAAPI for FFmpeg to encode 1080p 2560x1080 screen capture at 60fps reduces CPU usage from 90% to 10% on a old corei5 with intel HD 3000; An old laptop could be perfectly used as an encoding machine for streaming just by using HW Acceleration. What's funny is that the laptop also has Radeon HD 6490M with 1GB GDDR5 dedicated memory and it's not supported by VAAPI for encoding! GPGPU API/Platform Support are astonishingly messy. [1]https://github.com/doe300/VC4CL [2]https://trac.ffmpeg.org/wiki/HWAccelIntro

Vulkan can be used for compute, although I would guess that few applications support that. For pre Pi4 boards, there is an OpenCL implementation. https://github.com/doe300/VC4CL