Babylon.js performance hits

[stefnotch]

Currently we're using Babylon.js abstractions. Which come with some performance losses, since the abstractions aren't always ideal.

• Slow startup: because Babylon built-in GLSL shaders get transpiled to WGSL at runtime https://github.com/cg-tuwien/ShadertoyOfParametricModeling/blob/b983ef52cc3ec414d3eb12a6dc87c17d9d539fd8/src/globals.ts#L27
• No readonly buffers: The StorageBuffer abstraction doesn't let one provide initial data, so one has to make a buffer write-able. https://github.com/cg-tuwien/ShadertoyOfParametricModeling/blob/7729953eb4a01b130880db66fc64017e06f12a09/src/components/VirtualModel.vue#L116-L122
• Bind groups are abstracted. So Babylon.js creates a few new bind groups every frame, whenever we change the used storage buffer.
• Bind groups aren't a thing, so we can't use the same compute shader twice with different buffers. So we're creating a separate compute shader just for that.

[stefnotch]

Well, now we're using the Rust backend. Closing