1 files changed, 103 insertions, 0 deletions
diff --git a/boot.js b/boot.js
new file mode 100644
index 0000000..161a4d9
--- /dev/null
+++ b/boot.js
@@ -0,0 +1,103 @@
+async function load() {
+  const procMap = new WeakMap();
+
+  function wrapProc(obj) {
+    function makeWrapper() {
+      const proc = scheme.to_js(obj);
+      function wrapper (...args) {
+        return proc.call(...args);
+      }
+      procMap.set(obj, wrapper);
+      return wrapper;
+    }
+
+    return procMap.get(obj) || makeWrapper();
+  }
+
+  const mod = await SchemeModule.fetch_and_instantiate("game.wasm", {}, {
+    window: {
+      requestAnimationFrame(proc) {
+        window.requestAnimationFrame(wrapProc(proc));
+      },
+      setTimeout(proc, delay) {
+        window.setTimeout(wrapProc(proc), delay);
+      }
+    },
+    document: {
+      get() { return document; },
+      body() { return document.body; },
+      getElementById: Document.prototype.getElementById.bind(document),
+      createTextNode: Document.prototype.createTextNode.bind(document),
+      createElement: Document.prototype.createElement.bind(document)
+    },
+    element: {
+      value(elem) {
+        return elem.value;
+      },
+      setValue(elem, value) {
+        elem.value = value;
+      },
+      setWidth(elem, width) {
+        elem.width = width;
+      },
+      setHeight(elem, height) {
+        elem.height = height;
+      },
+      appendChild(parent, child) {
+        return parent.appendChild(child);
+      },
+      setAttribute(elem, name, value) {
+        elem.setAttribute(name, value);
+      },
+      removeAttribute(elem, name) {
+        elem.removeAttribute(name);
+      },
+      remove(elem) {
+        elem.remove();
+      },
+      replaceWith(oldElem, newElem) {
+        oldElem.replaceWith(newElem);
+      },
+      addEventListener(elem, name, proc) {
+        elem.addEventListener(name, wrapProc(proc));
+      },
+      removeEventListener(elem, name, proc) {
+        elem.removeEventListener(name, wrapProc(proc));
+      }
+    },
+    event: {
+      keyboardCode(event) {
+        return event.code;
+      }
+    },
+    canvas: {
+      getContext(elem, type) {
+        return elem.getContext(type);
+      },
+      setFillColor(context, color) {
+        context.fillStyle = color;
+      },
+      clearRect(context, x, y, w, h) {
+        context.clearRect(x, y, w, h);
+      },
+      fillRect(context, x, y, w, h) {
+        context.fillRect(x, y, w, h);
+      },
+      drawImage(context, image, sx, sy, sWidth, sHeight, dx, dy, dWidth, dHeight) {
+        context.drawImage(image, sx, sy, sWidth, sHeight, dx, dy, dWidth, dHeight);
+      },
+      setScale(context, sx, sy) {
+        context.scale(sx, sy);
+      },
+      setTransform(context, a, b, c, d, e, f) {
+        context.setTransform(a, b, c, d, e, f);
+      },
+      setImageSmoothingEnabled(context, enabled) {
+        context.imageSmoothingEnabled = (enabled == 1);
+      }
+    }
+  });
+  const scheme = await mod.reflect();
+  scheme.init_module(mod);
+}
+window.addEventListener("load", load);