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README: update toolchain docs to match what we actually use

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colin 2022-12-07 09:56:36 +00:00
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@ -75,16 +75,15 @@ which can easily be 30-100x faster:
## GPU Acceleration
we use rust-gpu for gpu acceleration. presently, this requires *specific* versions of rust-nightly to work.
we use [rust-gpu]((https://github.com/EmbarkStudios/rust-gpu/)) for gpu acceleration.
presently, this requires *specific* versions of rust-nightly to work.
the feature is toggled at runtime, but compiled unconditionally. set up the toolchain according to [rust-toolchain.toml](rust-toolchain.toml):
```
$ rustup default nightly-2022-04-11
$ rustup default nightly-2022-08-29
$ rustup component add rust-src rustc-dev llvm-tools-preview
```
(it's possible to work with older nightlies like `nightly-2022-01-13` or `nightly-2021-06-08` if you enable the 2020 feature and downgrade whichever packages rustc complains about.)
now you can swap out the `CpuDriver` with a `SpirvDriver` and you're set:
```diff
- let mut driver = Driver::new(SpirvSim::<f32, Mat, spirv::CpuBackend>::new(size, feature_size));