mirror of https://github.com/sotrh/learn-wgpu
migrated to 0.13
Ben Hansen
2 years ago
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# Update to 0.13!
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[WGPU Change Log](https://github.com/gfx-rs/wgpu/blob/master/CHANGELOG.md#wgpu-013-2022-06-30)
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The change log above contains most of the details about what has changed about WGPU and therefore the tutorial. I will make a special mention about how to use `map_async()` as that has changed. Previously `map_async` returned a promise that you had to await before you could access a buffers contents. It now expects a `'static` callback that takes the `Result` of the mapping attempt as a parameter. This means that if we want to save a buffers context to an image instead of doing the following:
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```rust
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{
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let buffer_slice = output_buffer.slice(..);
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let mapping = buffer_slice.map_async(wgpu::MapMode::Read);
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device.poll(wgpu::Maintain::Wait);
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mapping.await.unwrap();
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let data = buffer_slice.get_mapped_range();
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use image::{ImageBuffer, Rgba};
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let buffer =
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ImageBuffer::<Rgba<u8>, _>::from_raw(texture_size, texture_size, data).unwrap();
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buffer.save("image.png").unwrap();
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}
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output_buffer.unmap();
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```
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We would do the following:
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```rust
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{
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let buffer_slice = output_buffer.slice(..);
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let (tx, rx) = futures_intrusive::channel::shared::oneshot_channel();
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buffer_slice.map_async(wgpu::MapMode::Read, move |result| {
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tx.send(result).unwrap();
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});
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device.poll(wgpu::Maintain::Wait);
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rx.receive().await.unwrap().unwrap();
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let data = buffer_slice.get_mapped_range();
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use image::{ImageBuffer, Rgba};
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let buffer =
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ImageBuffer::<Rgba<u8>, _>::from_raw(texture_size, texture_size, data).unwrap();
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buffer.save("image.png").unwrap();
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}
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output_buffer.unmap();
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```
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You can explore the reasoning for the change to `map_async` in [this PR](https://github.com/gfx-rs/wgpu/pull/2698).
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