Godot: Add support for Themaister's compute shader FFT implementation

[creikey]

It would be really great to great to have access to Themaister's fft implentation for glsl for implementing Tessendorf's ocean wave vertex function.

Godot version:

3.1.1

OS/device including version:

Issue description:

Steps to reproduce:

Minimal reproduction project:

[clayjohn]

This implementation relies on GLES3.1 or OpenGL 4.3, neither of which are supported by Godot currently.

Since it relies entirely on compute shaders, something similar could be added in theory after the vulkan port is finished.

Also note, this isn't something you could add to a shader language. The fft is computed in entirely support GL calls in a compute shader. So it would have to be a separate resource entirely.

[creikey]

It would be really great to have this function in Godot 4 with Vulkan, Gernster Waves really don't cut it :smile: once vulkan is fully ported in the master branch I could take a crack at this.

[mhilbrunner]

Feature and improvement proposals for the Godot Engine are now being discussed and reviewed in a dedicated Godot Improvement Proposals (GIP) (godotengine/godot-proposals) issue tracker. The GIP tracker has a detailed issue template designed so that proposals include all the relevant information to start a productive discussion and help the community assess the validity of the proposal for the engine.

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