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[WIP] Webassembly #1056
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[WIP] Webassembly #1056
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964a0d6
rust-wasm-template
sakex b989324
WASM intro
sakex b0ce243
load-wasm-module
sakex 7d20945
expose-method
sakex fdf8386
expose-rust-type
sakex d4f4ff3
Fix summary indentation
sakex 39ae389
import-method
sakex 7d411b7
web-sys
sakex 4f8bc90
error-handling.md
sakex 8063357
improve CSS
sakex 13af224
import-js-type
sakex f7d791f
async.md
sakex 9b00ca4
remove log from async.md
sakex bee0f95
limitations/borrow-checker.md
sakex a87c286
limitations
sakex abfe08c
update-deps
sakex 46c5a44
Fix import in async.md
9f724d4
Use generic server
sakex afbd29e
closures.md
sakex 449ac4d
camera.md
sakex 360b43e
Bonus exercise for camera
sakex 771e41c
Clearer instructions in camera.md
sakex 6f94c9e
game-of-life.md
sakex 37ebf83
Add dependencies to async.md
sakex 5cb15f1
Fix formatting errors and remove font
sakex d7579d7
WASM -> Wasm
sakex 62200ff
More concise class
sakex 59fa8cc
Fix GOL setup
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| { | ||
| "image": "mcr.microsoft.com/devcontainers/rust:0-1-bullseye", | ||
| // Configure tool-specific properties. | ||
| "customizations": { | ||
| // Configure properties specific to VS Code. | ||
| "vscode": { | ||
| "settings": {}, | ||
| "extensions": [ | ||
| "streetsidesoftware.code-spell-checker" | ||
| ] | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| # Camera | ||
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| In this exercise we will play with the camera in real time. | ||
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| Serve the web server and navigate to [http://localhost:8000/exercises/camera/](http://localhost:8000/exercises/camera/). | ||
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| You will edit [lib.rs](../../rust-wasm-template/lib.rs) as usual. | ||
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| Here is the basic code you will need: | ||
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| ```rust | ||
| extern crate console_error_panic_hook; | ||
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| use js_sys::Uint8ClampedArray; | ||
| use wasm_bindgen::prelude::*; | ||
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| #[wasm_bindgen] | ||
| extern "C" { | ||
| fn alert(s: &str); | ||
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| #[wasm_bindgen(js_namespace = console)] | ||
| pub fn log(s: &str); | ||
| } | ||
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| #[wasm_bindgen] | ||
| pub fn setup() { | ||
| console_error_panic_hook::set_once(); | ||
| } | ||
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| #[wasm_bindgen] | ||
| pub fn edit_bitmap(image_data: &Uint8ClampedArray, width: u32, height: u32) { | ||
| } | ||
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| ``` | ||
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| We want to edit the function `edit_bitmap`. `image_data` is a reference to the [Uint8ClampedArray](https://rustwasm.github.io/wasm-bindgen/api/js_sys/struct.Uint8ClampedArray.html) being rendered on your screen. `Uint8ClampedArray` is a flat array of unsigned int of `8` bits. | ||
| It represents _srgb_ image, which means that each pixel is represented as a vector of 4 elements [red, green, blue, illumination]. | ||
| The image can be thought of as a matrix of dimension `(width, height, 4)`, it is row-major. | ||
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| We will reuse our different implementations. So do not erase them when going from one exercise to the next. | ||
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| First off let's implement some methods that modify the video live: | ||
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| 1. Paint the top half the image to black. | ||
| 2. Paint the left half of the image to white. | ||
| 3. Create an X-ray effect. This is done by mapping colors to their opposite, for instance `0<->255`, `100<->155`. Beware of illumination. | ||
| 4. _Bonus question:_ Now feel free to implement other transformations such as _greyscale_ or adding _random noise_. | ||
| 5. Let's now add functionalities to our page. In the _setup_ function create a dropdown (`<select>`) that will change which transformation to apply to the image. | ||
| 6. _Bonus question:_ Track moving objects. This can be done by figuring out only the pixels that didn't change between multiple frames. For instance, you could compute the standard deviation of the pixel and black out below a threshold. | ||
| While this can be achieved without touching Javascript, I recommend editing it. | ||
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Could you update
dprint.jsonto include the new files undersrc/exercises/webassembly/andsrc/webassembly/? That way we can ensure they're formatted in a consistent way!There was a problem hiding this comment.
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Hey, I don't know how to do this, do you have an example?