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Rust + WebAssemblyで広がるWebの未来
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Yosuke Onoue
November 24, 2018
Technology
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Rust + WebAssemblyで広がるWebの未来
FRONTEND CONFERENCE 2018(
https://2018.kfug.jp/)の登壇資料です
。
Yosuke Onoue
November 24, 2018
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Transcript
͓ͷ͏͑ 3VTU 8FC"TTFNCMZͰ͕Δ 8FCͷະདྷ '30/5&/%$0/'&3&/$& ݄
ࣗݾհ w ඌ্༸հ :PTVLF0OPVF w ຊେֶจཧֶ෦ใՊֶՊॿڭ w OHLZPUPΦʔΨφΠβʔ w
ใՄࢹԽɺཧ࠷దԽɺҙࢥܾఆࢧԉͷݚڀ w ՄࢹԽγεςϜͷ։ൃʹ8FCϑϩϯτΤϯυٕज़Λ༻
લճ·Ͱͷ͋Β͢͡
2015/08/22 グランフロントエンド asm.jsとWebAssemblyって実際なんなの? おのうえ (@_likr) !4
フリーランチの終焉 ✤ フロントエンド開発への要求は⾼まる ✤ ハードウェア、JSエンジンの性能向上の恩恵を知らな いうちに受けていた時代は終わるかもしれない? ✤ フロントエンドエンジニア(JSプログラマ)が JavaScriptプログラムの速度に負う責任が増す !5
まとめ ✤ asm.jsを効果的に使えば、これまでWebでできなかっ た種類のアプリケーションが実現できる ✤ WebAssemblyによる順当な進化に期待 ✤ なんでも速くなる魔法ではないので、 ⽤法⽤量を守って正しくお使いください !6
プログラミング⾔言語Rust おのうえ@_likr Grand Frontend Osaka 2016 2016年年8⽉月27⽇日
まとめ • Rustはいいぞ • WebAssemblyの実装は着実に進んでいる • RustでWebの部品を作れる未来はそう遠くない(かも • 未来に備えよう •
たまにはWebの未来を考えてみるのはいかが?
ͦͯͦ͠ͷޙ
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(FUUJOH4UBSUFEXJUI&NTDSJQUFO $ emcc -s EXTRA_EXPORTED_RUNTIME_METHODS='["ccall", "cwrap"]' \ -s EXPORTED_FUNCTIONS='["_twice"]' \
-s MODULARIZE=1 -s -o example.js example.c $ node main.js 4.4 1 double twice(double value) { 2 return value * 2; 3 } FYBNQMFD 1 const wasm = require('./example') 2 3 wasm().then((Module) => { 4 const twice = Module.cwrap('twice', 'number', ['number']) 5 console.log(twice(2.2)) 6 }) NBJOKT
$$ ʁ w ϝϦοτ w ߴ w ϨΠϠʔͷૢ࡞ w աڈͷࢿ࢈ͷ׆༻
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w ϥϯλΠϜͳ͠ʢܰྔ͕ͩ࠷খݶͷػೳ͚ͩʣ
4FUVQ $ curl https://sh.rustup.rs -sSf | sh $ source ~/.cargo/env
$ rustup default nightly $ rustup target add wasm32-unknown-unknown
Ϗϧυ $ cargo new --lib example $ cd example $
cargo build --target wasm32-unknown-unknown 1 [package] 2 name = "example" 3 version = "0.1.0" 4 authors = ["Yosuke Onoue <
[email protected]
>"] 5 6 [dependencies] 7 8 [lib] 9 crate-type = ["cdylib"] $BSHPUPNM 1 #[no_mangle] 2 pub fn twice(value: f64) -> f64 { 3 value * 2.0 4 } TSDMJCST
࣮ߦ 1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta
charset="utf-8"/> 5 <title>Rust + WebAssembly Example</title> 6 </head> 7 <body> 8 <script> 9 fetch('./target/wasm32-unknown-unknown/debug/example.wasm') 10 .then((response) => response.arrayBuffer()) 11 .then((buffer) => WebAssembly.instantiate(buffer)) 12 .then(({ instance }) => { 13 const { twice } = instance.exports 14 console.log(twice(2.2)) 15 }) 16 </script> 17 </body> 18 </html> JOEFYIUNM
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fetch('./target/wasm32-unknown-unknown/debug/example.wasm') 10 .then((response) => response.arrayBuffer()) 11 .then((buffer) => WebAssembly.instantiate(buffer)) 12 .then(({ instance }) => { 13 const { twice } = instance.exports 14 console.log(twice(2.2)) 15 })
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Ϗϧυ 1 extern crate wasm_bindgen; 2 3 use wasm_bindgen::prelude::*; 4
5 #[wasm_bindgen] 6 pub fn twice(value: f64) -> f64 { 7 value * 2.0 8 } TSDMJCST 1 [package] 2 name = "bindgen-example" 3 version = "0.1.0" 4 authors = ["Yosuke Onoue <
[email protected]
>"] 5 edition = "2018" 6 7 [dependencies] 8 wasm-bindgen = "0.2" 9 10 [lib] 11 crate-type = ["cdylib"] $BSHPUPNM $ wasm-bindgen --out-dir . target/wasm32-unknown-unknown/debug/bindgen_example.wasm
࣮ߦ 1 import('./bindgen_example').then(({ twice }) => { 2 console.log(twice(2.2)) 3
}) JOEFYKT 1 const path = require('path') 2 3 module.exports = { 4 entry: './index.js', 5 output: { 6 path: path.resolve(__dirname), 7 filename: 'bundle.js' 8 } 9 } XFCQBDLDPOpHKT 1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta charset="utf-8"/> 5 <title>wasm-bindgen Example</title> 6 </head> 7 <body> 8 <script src="bundle.js"></script> 9 </body> 10 </html> JOEFYIUNM
ଞʹͰ͖Δ͜ͱ 15 #[wasm_bindgen] 16 pub struct Screen { 17 bytes:
Vec<u8>, 18 #[wasm_bindgen(readonly)] 19 pub width: usize, 20 #[wasm_bindgen(readonly)] 21 pub height: usize, 22 } 23 24 #[wasm_bindgen] 25 impl Screen { 26 #[wasm_bindgen(constructor)] 27 pub fn new(width: usize, height: usize) -> Screen { 28 Screen { 29 bytes: create_buffer(width, height), 30 width, 31 height, 32 } 33 } 34 42 43 pub fn resize(&mut self, width: usize, height: usize) { 44 self.bytes = create_buffer(width, height); 45 self.width = width; 46 self.height = height; 47 } 48 }
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bg = import('mandelbrot/mandelbrot_bg') 3 Promise.all([mod, bg]).then(([{ mandelbrot, Screen }, { memory }]) => { 4 const canvas = this.display.nativeElement; 5 const screen = new Screen(canvas.width, canvas.height); 6 7 const bytes = new Uint8ClampedArray(memory.buffer, screen.pointer(), screen.size()); 8 const image = new ImageData(bytes, screen.width, screen.height); 9 mandelbrot(screen, -3, -2, 0.01, 100); 10 11 const ctx = canvas.getContext('2d'); 12 ctx.putImageData(image, 0, 0); 13 })
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