starting work on assemblyscript example

cart/as/.gitignore

@@ -0,0 +1,4 @@
+.DS_Store
+node_modules
+build
+*.log

cart/as/README.md

@@ -0,0 +1,5 @@
+This is an example null0 cart written in [assemblyscript](https://www.assemblyscript.org/).
+
+## TODO
+
+- look into [better build](https://github.com/notnullgames/null0-ideas/blob/main/projects/assemblyscript/tools/build.mjs)

cart/as/asconfig.json

@@ -0,0 +1,16 @@
+{
+  "targets": {
+    "release": {
+      "outFile": "build/main.wasm",
+      "textFile": "build/main.wat",
+      "sourceMap": true,
+      "optimizeLevel": 3,
+      "shrinkLevel": 0,
+      "converge": false,
+      "noAssert": false
+    }
+  },
+  "options": {
+    "bindings": "esm"
+  }
+}

cart/as/null0.ts

@@ -0,0 +1,19 @@
+// log a string
+@external("null0", "trace")
+declare function _null0_real_trace(text: ArrayBuffer): void
+
+// these are called by language
+// https://www.assemblyscript.org/concepts.html#special-imports
+// TODO: would WASI help with these?
+
+export function _null0_trace(message: String): void {
+  _null0_real_trace(String.UTF8.encode(message, true));
+}
+
+export function _null0_abort(message: String, fileName: String, line: u32, column: u32): void {
+  _null0_real_trace(String.UTF8.encode("ABORT: " + message, true));
+}
+
+export function _null0_seed(): f64 {
+  return 1.0;
+}

cart/as/package.json

@@ -0,0 +1,20 @@
+{
+  "name": "@null0/example-as",
+  "version": "0.0.0",
+  "scripts": {
+    "build": "asc src/index.ts  --target release --use trace=_null0_trace --use abort=_null0_abort --use seed=_null0_seed --lib ./null0.ts && mkdir -p build/cart/assets && cp build/main.wasm build/cart && cp src/assets/* build/cart/assets && cd build/cart && zip -r ../example.null0 .",
+    "start": "../../build/host/null0  ./build/example.null0",
+    "prestart": "npm run build"
+  },
+  "license": "MIT",
+  "devDependencies": {
+    "assemblyscript": "^0.27.29"
+  },
+  "type": "module",
+  "exports": {
+    ".": {
+      "import": "./build/release.js",
+      "types": "./build/release.d.ts"
+    }
+  }
+}

cart/as/src/index.ts

@@ -0,0 +1,9 @@
+// called when the cart is loaded
+export function load(): void {
+  trace("hello");
+}
+
+// called on every frame
+export function update(): void {
+  trace("update");
+}

cart/as/src/tsconfig.json

@@ -0,0 +1,6 @@
+{
+  "extends": "assemblyscript/std/assembly.json",
+  "include": [
+    "./**/*.ts"
+  ]
+}

null0_api/src/null0_api_wamr.h

@@ -785,7 +785,6 @@ RuntimeInitArgs null0_init_args() {
   init_args.n_native_symbols = sizeof(null0_wamr_callbacks) / sizeof(NativeSymbol);
   init_args.native_module_name = "null0";
   init_args.native_symbols = null0_wamr_callbacks;
-
   return init_args;
 }
 
@@ -815,14 +814,14 @@ bool null0_init() {
   error_buf[0] = 0;
   wasm_module_t module = wasm_runtime_load(wasmBytes, wasmSize, error_buf, sizeof(error_buf));
   if (error_buf[0] != 0) {
-    printf("load - %s\n", error_buf);
+    fprintf(stderr, "ERROR: load - %s\n", error_buf);
     return false;
   }
 
   error_buf[0] = 0;
   module_inst = wasm_runtime_instantiate(module, stack_size, heap_size, error_buf, sizeof(error_buf));
   if (error_buf[0] != 0) {
-    printf("instantiate - %s\n", error_buf);
+    fprintf(stderr, "ERROR: instantiate - %s\n", error_buf);
     return false;
   }