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So there is support for Open GL ES 3.1, but how can I use it on the Raspberry Pi 4? Is there any other way to use the GPU for calculations such as fft and logarithm?

Hneggbrand
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Check for the boot partition. There you can find many overlays. Try using them. And install mesa gl driver. Then you can activate them from raspi-config

Sohan Arafat
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You might like to look at Pete Warden's work using Deep Learning for image recognition with the RPi's GPU here. If you want to code using the GPU have a look at QPILib which is an astonishing piece of work building a language to code on to the Rpi's GPU using only C++'s macro language.

QPULib is a programming language and compiler for the Raspberry Pi's Quad Processing Units (QPUs). It is implemented as a C++ library that runs on the Pi's ARM CPU, generating and offloading programs to the QPUs at runtime.

Nick
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