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add file input to load cart from filesystem

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This commit is contained in:
Dennis Ranke
2021-11-02 23:27:46 +01:00
parent a39226b908
commit b34ff18a60
4 changed files with 102 additions and 53 deletions
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web/src/base.wasm
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1
web/src/index.html
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@@ -7,6 +7,7 @@
<body>
<canvas id="screen" width="320" height="256"></canvas>
<div id="message"></div>
<input id="cart" type="file" accept=".wasm,.uw8,application/wasm">
<script type="module">
import "./main.js";
</script>

62
web/src/main.js
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@@ -8,6 +8,14 @@ async function loadWasm(url, imports) {
return new WebAssembly.Instance(compiled_module, imports);
}
function setMessage(size, error) {
let html = size ? `${size} bytes` : 'Insert cart';
if(error) {
html += ` - <span class="error">${error.replaceAll('<', '&lt;')}</span>`
}
document.getElementById('message').innerHTML = html;
}
let cancelFunction;
async function runModule(data) {
@@ -16,7 +24,29 @@ async function runModule(data) {
cancelFunction = null;
}
document.getElementById('message').innerText = '' + data.byteLength + ' bytes';
let cartridgeSize = data.byteLength;
setMessage(cartridgeSize);
if(cartridgeSize == 0) {
return;
}
let dataU8Array = new Uint8Array(data);
let newURL = window.location.pathname;
if(cartridgeSize <= 1024) {
let dataString = '';
for(let byte of dataU8Array) {
dataString += String.fromCharCode(byte);
}
newURL += '#' + btoa(dataString);
}
if(newURL != window.location.href) {
history.replaceState(null, null, newURL);
history.pushState(null, null, newURL);
}
try {
let loaderImport = {
uw8: {
@@ -26,9 +56,10 @@ async function runModule(data) {
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();
if(dataU8Array[0] != 0) {
new Uint8Array(loadMem).set(dataU8Array);
new Uint8Array(loadMem).set(new Uint8Array(baseModule), data.byteLength);
let destOffset = data.byteLength + baseModule.byteLength;
@@ -36,11 +67,11 @@ async function runModule(data) {
data = new ArrayBuffer(endOffset - destOffset);
new Uint8Array(data).set(new Uint8Array(loadMem).slice(destOffset, endOffset));
}
let importObject = {
uw8: {
ram: new WebAssembly.Memory({ initial: 8, maximum: 8 }),
time: new WebAssembly.Global({value: 'i32', mutable: true}, 0),
}
};
@@ -59,13 +90,14 @@ async function runModule(data) {
let keepRunning = true;
cancelFunction = () => keepRunning = false;
function mainloop() {
if(!keepRunning) {
return;
}
importObject.uw8.time.value = Date.now() - startTime;
instance.exports.tic();
try {
instance.exports.tic(Date.now() - startTime);
let framebuffer = new Uint8Array(importObject.uw8.ram.buffer.slice(120, 120 + 320*256));
for(let i = 0; i < 320*256; ++i) {
@@ -76,9 +108,15 @@ async function runModule(data) {
canvasCtx.putImageData(imageData, 0, 0);
window.requestAnimationFrame(mainloop);
} catch(err) {
setMessage(cartridgeSize, err.toString());
}
}
mainloop();
} catch(err) {
setMessage(cartridgeSize, err.toString());
}
}
async function runModuleFromURL(url) {
@@ -86,8 +124,18 @@ async function runModuleFromURL(url) {
}
function runModuleFromHash() {
runModuleFromURL('data:;base64,' + window.location.hash.slice(1));
let base64Data = window.location.hash.slice(1);
if(base64Data.length > 0) {
runModuleFromURL('data:;base64,' + base64Data);
}
}
let fileInput = document.getElementById('cart');
fileInput.onchange = () => {
if(fileInput.files.length > 0) {
runModuleFromURL(URL.createObjectURL(fileInput.files[0]));
}
};
window.onhashchange = runModuleFromHash;
runModuleFromHash();

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web/src/uw8loader.wasm
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