dranke/microw8
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first version with uw8loader

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This commit is contained in:
Dennis Ranke
2021-11-02 00:04:19 +01:00
parent ddc9a70006
commit a39226b908
5 changed files with 58 additions and 9 deletions
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web/src/base.wasm Normal file
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3
web/src/index.html
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@@ -5,7 +5,8 @@
<title>MicroW8</title> <title>MicroW8</title>
</head> </head>
<body> <body>
<canvas id="screen" width="320" height="256" /> <canvas id="screen" width="320" height="256"></canvas>
<div id="message"></div>
<script type="module"> <script type="module">
import "./main.js"; import "./main.js";
</script> </script>

64
web/src/main.js
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@@ -1,17 +1,50 @@
import wasmDataUrl from "data-url:./trainride.uw8"; import loaderUrl from "data-url:./uw8loader.wasm";
import baseUrl from "data-url:./base.wasm";
async function main() { async function loadWasm(url, imports) {
let wasm_module = await (await fetch(wasmDataUrl)).arrayBuffer(); let wasm_module = await (await fetch(url)).arrayBuffer();
let compiled_module = await WebAssembly.compile(wasm_module); let compiled_module = await WebAssembly.compile(wasm_module);
let import_object = { return new WebAssembly.Instance(compiled_module, imports);
}
let cancelFunction;
async function runModule(data) {
if(cancelFunction) {
cancelFunction();
cancelFunction = null;
}
document.getElementById('message').innerText = '' + data.byteLength + ' bytes';
let loaderImport = {
uw8: {
ram: new WebAssembly.Memory({ initial: 8 })
}
};
let loadMem = loaderImport.uw8.ram.buffer;
let loader = await loadWasm(loaderUrl, loaderImport);
new Uint8Array(loadMem).set(new Uint8Array(data));
let baseModule = await (await fetch(baseUrl)).arrayBuffer();
new Uint8Array(loadMem).set(new Uint8Array(baseModule), data.byteLength);
let destOffset = data.byteLength + baseModule.byteLength;
let endOffset = loader.exports.load_uw8(0, data.byteLength, data.byteLength, destOffset);
data = new ArrayBuffer(endOffset - destOffset);
new Uint8Array(data).set(new Uint8Array(loadMem).slice(destOffset, endOffset));
let importObject = {
uw8: { uw8: {
ram: new WebAssembly.Memory({ initial: 8, maximum: 8 }), ram: new WebAssembly.Memory({ initial: 8, maximum: 8 }),
time: new WebAssembly.Global({value: 'i32', mutable: true}, 0), time: new WebAssembly.Global({value: 'i32', mutable: true}, 0),
} }
}; };
let instance = new WebAssembly.Instance(compiled_module, import_object); let instance = new WebAssembly.Instance(await WebAssembly.compile(data), importObject);
let canvasCtx = document.getElementById('screen').getContext('2d'); let canvasCtx = document.getElementById('screen').getContext('2d');
let imageData = canvasCtx.createImageData(320, 256); let imageData = canvasCtx.createImageData(320, 256);
@@ -23,12 +56,18 @@ async function main() {
let startTime = Date.now(); let startTime = Date.now();
let keepRunning = true;
cancelFunction = () => keepRunning = false;
function mainloop() { function mainloop() {
import_object.uw8.time.value = Date.now() - startTime; if(!keepRunning) {
return;
}
importObject.uw8.time.value = Date.now() - startTime;
instance.exports.tic(); instance.exports.tic();
let framebuffer = new Uint8Array(import_object.uw8.ram.buffer.slice(120, 120 + 320*256)); let framebuffer = new Uint8Array(importObject.uw8.ram.buffer.slice(120, 120 + 320*256));
for(let i = 0; i < 320*256; ++i) { for(let i = 0; i < 320*256; ++i) {
buffer[i * 4] = framebuffer[i]; buffer[i * 4] = framebuffer[i];
buffer[i * 4 + 1] = framebuffer[i]; buffer[i * 4 + 1] = framebuffer[i];
@@ -42,4 +81,13 @@ async function main() {
mainloop(); mainloop();
} }
main(); async function runModuleFromURL(url) {
runModule(await (await fetch(url)).arrayBuffer());
}
function runModuleFromHash() {
runModuleFromURL('data:;base64,' + window.location.hash.slice(1));
}
window.onhashchange = runModuleFromHash;
runModuleFromHash();

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