54 lines
1.5 KiB
JavaScript
54 lines
1.5 KiB
JavaScript
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import { appGlobals } from './globals.js'
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export async function loadWasmModule(filePath, environment)
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{
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let result = null;
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try
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{
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const fetchPromise = fetch(filePath);
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const wasmModule = await WebAssembly.instantiateStreaming(
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fetchPromise,
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{ env: environment }
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);
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result = wasmModule.instance;
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}
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catch (exception)
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{
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console.error("Failed to load WASM module from \"" + filePath + "\":", exception);
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}
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return result;
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}
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//TODO: We should do some performance measurements of wasmPntrToJsString vs wasmPntrAndLengthToJsString!
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export function wasmPntrToJsString(ptr)
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{
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let cIndex = ptr;
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while (cIndex < appGlobals.memDataView.byteLength)
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{
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let byteValue = appGlobals.memDataView.getUint8(cIndex, true);
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if (byteValue == 0) { break; }
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cIndex++;
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}
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return appGlobals.textDecoder.decode(
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appGlobals.memDataView.buffer.slice(ptr, cIndex)
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);
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}
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export function wasmPntrAndLengthToJsString(ptr, length)
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{
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return appGlobals.textDecoder.decode(
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appGlobals.memDataView.buffer.slice(ptr, ptr + length)
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);
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}
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export function jsStringToWasmPntr(arenaPntr, jsString, addNullTerm)
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{
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let encodedBytes = appGlobals.textEncoder.encode(jsString);
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let memPntr = appGlobals.wasmModule.exports.cAllocMem(arenaPntr, encodedBytes.length + (addNullTerm ? 1 : 0), 0);
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if (memPntr == 0) { return memPntr; }
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const writeArray = new Uint8Array(appGlobals.wasmModule.exports.memory.buffer);
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writeArray.set(encodedBytes, memPntr);
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if (addNullTerm) { writeArray[encodedBytes.length] = 0; }
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return memPntr;
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}
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