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Update wasm/README.md

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gingerBill
2022-06-01 10:40:59 +01:00
parent 25dae06b6a
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vendor/wasm/README.md
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@@ -4,57 +4,12 @@ This directory is for use when targeting the `js_wasm32` target and the packages
The `js_wasm32` target assumes that the WASM output will be ran within a web browser rather than a standalone VM. In the VM cases, either `wasi_wasm32` or `freestanding_wasm32` should be used accordingly. The `js_wasm32` target assumes that the WASM output will be ran within a web browser rather than a standalone VM. In the VM cases, either `wasi_wasm32` or `freestanding_wasm32` should be used accordingly.
## Example ## Example for `js_wasm32`
```js ```js
import {WasmMemoryInterface, odinSetupDefaultImports} from "./js/runtime.js"; <!-- Copy `vendor:wasm/js/runtime.js` into your web server -->
import {WebGLInterface} from "./WebGL/runtime.js"; <script type="text/javascript" src="runtime.js"></script>
<script type="text/javascript">
const runWasm = async (wasm_path, webglCanvasElement, consoleElement) => { odin.runWasm(pathToWasm, webglCanvasElement, consolePreElement);
let wasmMemoryInterface = new WasmMemoryInterface(); </script>
let imports = odinSetupDefaultImports(wasmMemoryInterface, consoleElement);
if (webglCanvasElement !== undefined) {
let gl_context = new WebGLInterface(
wasmMemoryInterface,
webglCanvasElement,
{antialias: false},
);
if (!gl_context.ctx) {
return "WebGL is not available.";
}
imports["webgl"] = gl_context.getWebGL1Interface()
imports["webgl2"] = gl_context.getWebGL2Interface()
}
const response = await fetch(wasm_path);
const file = await response.arrayBuffer();
const wasm = await WebAssembly.instantiate(file, imports);
const exports = wasm.instance.exports;
wasmMemoryInterface.setExports(exports);
wasmMemoryInterface.setMemory(exports.memory);
exports._start();
if (exports.step) {
const odin_ctx = exports.default_context_ptr();
let prevTimeStamp = undefined;
const step = (currTimeStamp) => {
if (prevTimeStamp == undefined) {
prevTimeStamp = currTimeStamp;
}
const dt = (currTimeStamp - prevTimeStamp)*0.001;
prevTimeStamp = currTimeStamp;
exports.step(dt, odin_ctx);
window.requestAnimationFrame(step);
};
window.requestAnimationFrame(step);
}
return;
};
``` ```