Add Makefile to help build wasm target.

michaelmcallister · Feb 25, 2021 · e7920db · e7920db
1 parent 9bdb48c
commit e7920db
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Showing 4 changed files with 29 additions and 1 deletion.
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1,3 @@
+build/
+html/*.wasm
+html/*.js
diff --git a/Makefile b/Makefile
@@ -0,0 +1,9 @@
+.PHONY: wasm
+wasm:
+	rm -f ./html/*.js ./html/*.wasm
+	cp $$(go env GOROOT)/misc/wasm/wasm_exec.js ./html/wasm_exec.js
+	GOOS=js GOARCH=wasm go build -o ./html/main.wasm .
+
+.PHONY: native
+native:
+	go build -o ./build/doomfire .
diff --git a/html/index.html b/html/index.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<script src="wasm_exec.js"></script>
+<script>
+  // Polyfill
+  if (!WebAssembly.instantiateStreaming) {
+    WebAssembly.instantiateStreaming = async (resp, importObject) => {
+      const source = await (await resp).arrayBuffer();
+      return await WebAssembly.instantiate(source, importObject);
+    };
+  }
+
+  const go = new Go();
+  WebAssembly.instantiateStreaming(fetch("main.wasm"), go.importObject).then(result => {
+    go.run(result.instance);
+  });
+</script>
diff --git a/main.go b/main.go
@@ -110,7 +110,7 @@ func (d *Doom) Draw(screen *ebiten.Image) {
 }
 
 // Layout takes the outside size (e.g., the window size) and returns the (logical) screen size.
-func (d *Doom) Layout(outsideWidth, outsideHeight int) (int, int) {
+func (d *Doom) Layout(_, _ int) (int, int) {
 	return d.width, d.height
 }