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https://github.com/rustwasm/wasm-bindgen.git
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25b26f41e7
... and add a parallel raytracing demo! This commit adds enough support to `wasm-bindgen` to produce a workable wasm binary *today* with the experimental WebAssembly threads support implemented in Firefox Nightly. I've tried to comment what's going on in the commits and such, but at a high level the changes made here are: * A new transformation, living in a new `wasm-bindgen-threads-xform` crate, prepares a wasm module for parallel execution. This performs a number of mundane tasks which I hope to detail in a blog post later on. * The `--no-modules` output is enhanced with more support for when shared memory is enabled, allowing passing in the module/memory to initialize the wasm instance on multiple threads (sharing both module and memory). * The `wasm-bindgen` crate now offers the ability, in `--no-modules` mode, to get a handle on the `WebAssembly.Module` instance. * The example itself requires Xargo to recompile the standard library with atomics and an experimental feature enabled. Afterwards it experimentally also enables threading support in wasm-bindgen. I've also added hopefully enough CI support to compile this example in a builder so we can upload it and poke around live online. I hope to detail more about the technical details here in a blog post soon as well!
33 lines
871 B
JavaScript
33 lines
871 B
JavaScript
// synchronously, using the browser, import out shim JS scripts
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importScripts('raytrace_parallel.js');
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let booted = false;
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let lastPtr = null;
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// Wait for the main thread to send us the shared module/memory. Once we've got
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// it, initialize it all with the `wasm_bindgen` global we imported via
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// `importScripts`.
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//
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// After our first message all subsequent messages are an entry point to run,
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// so we just do that.
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self.onmessage = function(args) {
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self.onmessage = event => run(event.data);
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const [module, memory] = args.data;
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wasm_bindgen(module, memory)
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.then(() => {
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booted = true;
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if (lastPtr)
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run(lastPtr);
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})
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.catch(e => setTimeout(() => { throw e; })); // propagate to main `onerror`
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};
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function run(ptr) {
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if (!booted) {
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lastPtr = ptr;
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return;
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}
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lastPtr = null;
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wasm_bindgen.child_entry_point(ptr);
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}
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