improve file selection button, first version of uw8-tool to build base.wasm

web/src/index.html

@@ -12,8 +12,7 @@
         <div id="centered">
             <canvas id="screen" width="640" height="512"></canvas>
             <div id="message"></div>
-            <button onclick="document.getElementById('cart').click()">Load cart...</button>
-            <input id="cart" style="visibility: hidden" type="file" accept=".wasm,.uw8,application/wasm">
+            <button id="cartButton">Load cart...</button>
         </div>
         <div id="footer">
             <a href="http://unlicense.org/" ref="license">Unlicense</a>

web/src/main.js

@@ -80,13 +80,14 @@ async function runModule(data) {
     
         let importObject = {
             env: {
-                memory: new WebAssembly.Memory({ initial: 8, maximum: 8 }),
+                memory: new WebAssembly.Memory({ initial: 4, maximum: 4 }),
             },
-            math: {
-                sin: Math.sin,
-                cos: Math.cos
-            }
+            math: {}
         };
+
+        for(let n of ['acos','asin','atan','atan2','cos','exp','log','sin','tan']) {
+            importObject.math[n] = Math[n];
+        }
     
         let instance = new WebAssembly.Instance(await WebAssembly.compile(data), importObject);
     
@@ -141,12 +142,17 @@ function runModuleFromHash() {
     }
 }
 
-let fileInput = document.getElementById('cart');
-fileInput.onchange = () => {
-    if(fileInput.files.length > 0) {
-        runModuleFromURL(URL.createObjectURL(fileInput.files[0]));
-    }
-};
-
 window.onhashchange = runModuleFromHash;
-runModuleFromHash();
+runModuleFromHash();
+
+document.getElementById('cartButton').onclick = () => {
+    let fileInput = document.createElement('input');
+    fileInput.type = 'file';
+    fileInput.accept = '.wasm,.uw8,application/wasm';
+    fileInput.onchange = () => {
+        if(fileInput.files.length > 0) {
+            runModuleFromURL(URL.createObjectURL(fileInput.files[0]));
+        }
+    };
+    fileInput.click();
+};