go/render: hello wasm!

commit 9cf3a96bfb6535c638c6719ca8f77a1834181b91 Author: Noah Petherbridge Date: Thu Feb 27 21:17:57 2020 -0800 Initial SDL2 Ripple applet diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..19e1bce --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +*.wasm diff --git a/README.md b/README.md new file mode 100644 index 0000000..8ed99b7 --- /dev/null +++ b/README.md @@ -0,0 +1 @@ +# WebAssembly Applets diff --git a/examples/ripple/Makefile b/examples/ripple/Makefile new file mode 100644 index 0000000..9f51472 --- /dev/null +++ b/examples/ripple/Makefile @@ -0,0 +1,11 @@ +.PHONY: run +run: + go run main.go ripple.go + +.PHONY: wasm +wasm: + GOOS=js GOARCH=wasm go build -v -o ripple.wasm main_wasm.go ripple.go + +.PHONY: serve +serve: wasm + go run server.go diff --git a/examples/ripple/index.html b/examples/ripple/index.html new file mode 100644 index 0000000..d6dedac --- /dev/null +++ b/examples/ripple/index.html @@ -0,0 +1,41 @@ + + + + go/render: hello wasm! + + + + + + + +

+ + + diff --git a/examples/ripple/main.go b/examples/ripple/main.go new file mode 100644 index 0000000..579850c --- /dev/null +++ b/examples/ripple/main.go @@ -0,0 +1,114 @@ +package main + +import ( + "math" + "math/rand" + "time" + + "git.kirsle.net/go/render" + "git.kirsle.net/go/render/sdl" +) + +// Config variables. +var ( + Filename = "photo.jpg" + Width = 640 + Height = 480 + Quality = 4 + + // computed. + Size = Width * Height +) + +// Runtime variables. +var ( + app *App + mw render.Engine + TargetFPS = 1000 / 60 // run at 60fps +) + +func main() { + setup() + mainloop() +} + +// setup the applet +func setup() { + // Seed the random number generator. + rand.Seed(time.Now().UnixNano()) + + // Create SDL2 window. + mw = sdl.New("Ripple effect", Width, Height) + if err := mw.Setup(); err != nil { + panic(err) + } + + // Load the jpeg image. + var err error + photo, err := render.OpenImage(Filename) + if err != nil { + panic(err) + } + + app = New(mw, photo) +} + +// loop runs the applet logic for each loop. +func loop() bool { + app.Ripple() + + mw.Clear(render.White) + + // Poll events. + ev, err := mw.Poll() + if err != nil { + panic(err) + } + + // Escape key closes the program. + if ev.Escape { + mw.Teardown() + return false + } + + // Is mouse over the drawing? + if ev.CursorX >= 0 && ev.CursorX < Width && ev.CursorY >= 0 && ev.CursorY < Width { + app.Disturb(ev.CursorX, ev.CursorY, 15000) + } + + // rain + app.Disturb( + int(math.Floor(rand.Float64()*float64(Width))), + int(math.Floor(rand.Float64()*float64(Height))), + int(rand.Float64()*10000), + ) + app.Present() + return true +} + +// mainloop runs a loop of loop() while maintaing the frame rate. +func mainloop() { + var ( + start time.Time + elapsed time.Duration + ok bool + ) + + for { + // Record how long the frame takes. + start = time.Now() + ok = loop() + + // Delay to maintain target frames per second. + var delay uint32 + elapsed = time.Now().Sub(start) / time.Millisecond + if TargetFPS-int(elapsed) > 0 { + delay = uint32(TargetFPS - int(elapsed)) + } + mw.Delay(delay) + + if !ok { + break + } + } +} diff --git a/examples/ripple/main_wasm.go b/examples/ripple/main_wasm.go new file mode 100644 index 0000000..97cc482 --- /dev/null +++ b/examples/ripple/main_wasm.go @@ -0,0 +1,136 @@ +// +build js,wasm + +package main + +import ( + "fmt" + "image/jpeg" + "math/rand" + "net/http" + "time" + + "git.kirsle.net/go/render" + "git.kirsle.net/go/render/canvas" +) + +// Config variables. +var ( + Filename = "photo.jpg" + Width = 640 + Height = 480 + Quality = 4 + + // computed. + Size = Width * Height +) + +// Runtime variables. +var ( + app *App + mw *canvas.Engine + TargetFPS = 1000 / 60 // run at 60fps +) + +func main() { + setup() + go mainloop() + for { + time.Sleep(10 * time.Second) + } +} + +// setup the applet +func setup() { + var err error + // Seed the random number generator. + rand.Seed(time.Now().UnixNano()) + + // Get the HTML Canvas. + mw, err = canvas.New("canvas") + if err != nil { + panic(err) + } + + // Configure the engine. + err = mw.Setup() + if err != nil { + panic(err) + } + + mw.AddEventListeners() + + // Fetch the image via HTTP. + r, err := http.Get(Filename) + if err != nil { + panic(err) + } + + // Parse it as a jpeg. + photo, err := jpeg.Decode(r.Body) + if err != nil { + panic(err) + } + + app = New(mw, photo) +} + +// loop runs the applet logic for each loop. +func loop() bool { + app.Ripple() + + fmt.Println("loop") + + mw.Clear(render.White) + + // Poll events. + ev, err := mw.Poll() + if err != nil { + panic(err) + } + + // Is mouse over the drawing? + if ev.CursorX >= 0 && ev.CursorX < Width && ev.CursorY >= 0 && ev.CursorY < Width { + app.Disturb(ev.CursorX, ev.CursorY, 15000) + } + + // rain + // app.Disturb( + // int(math.Floor(rand.Float64()*float64(Width))), + // int(math.Floor(rand.Float64()*float64(Height))), + // int(rand.Float64()*10000), + // ) + app.Present() + + // test + for pt := range render.IterLine(render.Origin, render.NewPoint(128, 128)) { + mw.DrawPoint(render.Black, pt) + } + return true +} + +// mainloop runs a loop of loop() while maintaing the frame rate. +func mainloop() { + var ( + start time.Time + elapsed time.Duration + ok bool + ) + + for { + // Record how long the frame takes. + start = time.Now() + ok = loop() + + // Delay to maintain target frames per second. + var delay uint32 + elapsed = time.Now().Sub(start) / time.Millisecond + if TargetFPS-int(elapsed) > 0 { + delay = uint32(TargetFPS - int(elapsed)) + } + mw.Delay(delay) + + if !ok { + break + } + } +} diff --git a/examples/ripple/photo.jpg b/examples/ripple/photo.jpg new file mode 100644 index 0000000..b7fdd90 Binary files /dev/null and b/examples/ripple/photo.jpg differ diff --git a/examples/ripple/ripple.go b/examples/ripple/ripple.go new file mode 100644 index 0000000..a2aac53 --- /dev/null +++ b/examples/ripple/ripple.go @@ -0,0 +1,123 @@ +package main + +import ( + "image" + + "git.kirsle.net/go/render" +) + +// App holds the ripple applet state. +type App struct { + e render.Engine + image image.Image + source *image.RGBA + data *image.RGBA + tex render.Texturer + + // computed + width int + height int + size int + + // frame buffers + buffer0 []int + buffer1 []int +} + +// New creates the ripple applet. +func New(e render.Engine, i image.Image) *App { + var ( + bounds = i.Bounds() + width = bounds.Max.X + height = bounds.Max.Y + size = width * height + ) + a := &App{ + e: e, + image: i, + source: render.ImageToRGBA(i), + data: render.ImageToRGBA(i), + width: width, + height: height, + size: size, + buffer0: make([]int, size), + buffer1: make([]int, size), + } + + tex, err := a.e.StoreTexture("pic", a.data) + if err != nil { + panic(err) + } + a.tex = tex + return a +} + +// Disturb creates a disturbance in the water. +func (a *App) Disturb(x, y, z int) { + if x < 2 || x > Width-2 || y < 1 || y > Height-2 { + return + } + var i = x + y*Width + a.buffer0[i] += z + a.buffer0[i-1] -= z +} + +// Ripple runs the ripple algorithm. +func (a *App) Ripple() { + var ( + width = a.width + size = a.size + ) + + // average cells to make the surface more even + for i := width + 1; i < size-width-1; i += 2 { + for x := 1; x < width-1; x++ { + avg := (a.buffer0[i] + a.buffer0[i+1] + a.buffer0[i-1] + a.buffer0[i-width] + a.buffer0[i+width]) / 5 + a.buffer0[i] = avg + i++ + } + } + + // Loop for every non-edge element. + y := 0 + for i := width + 1; i < size-width-1; i += 2 { + y++ + for x := 1; x < width-1; x++ { + // Wave propagation + waveHeight := (a.buffer0[i-1]+ + a.buffer0[i+1]+ + a.buffer0[i+Width]+ + a.buffer0[i-Width])/2 - a.buffer1[i] + a.buffer1[i] = waveHeight + + // Some very fake lighting + var light = int(float64(waveHeight)*2.0 - float64(a.buffer1[i-2])*0.6) + if light < -10 { + light = -10 + } else if light > 100 { + light = 100 + } + + color := a.source.At(x, y) + a.data.Set(x, y, render.FromColor(color).Lighten(light).ToColor()) + + i++ + } + } + + aux := a.buffer0 + a.buffer0 = a.buffer1 + a.buffer1 = aux + + a.tex, _ = a.e.StoreTexture("pic", a.data) +} + +// Present the visual state. +func (a *App) Present() { + rect := render.Rect{ + W: a.width, + H: a.height, + } + a.e.Copy(a.tex, rect, rect) + a.e.Present() +} diff --git a/examples/ripple/server.go b/examples/ripple/server.go new file mode 100644 index 0000000..112a3b2 --- /dev/null +++ b/examples/ripple/server.go @@ -0,0 +1,127 @@ +// +build disabled + +package main + +import ( + "fmt" + "io/ioutil" + "log" + "net/http" + "os/exec" + "path/filepath" + + "github.com/fsnotify/fsnotify" +) + +func main() { + const wasm = "/ripple.wasm" + + // Watch the dev directory for changes. + go watchChanges() + + http.Handle("/", http.FileServer(http.Dir("."))) + http.HandleFunc(wasm, func(w http.ResponseWriter, r *http.Request) { + w.Header().Set("Content-Type", "application/wasm") + http.ServeFile(w, r, "."+wasm) + }) + + fmt.Println("Listening at http://localhost:8080/") + log.Fatal(http.ListenAndServe(":8080", nil)) +} + +// onChange handler to rebuild the wasm file automatically. +func onChange() { + out, err := exec.Command("make", "wasm").Output() + if err != nil { + log.Printf("error: %s", err) + } + log.Printf("%s", out) + log.Printf("Doodle WASM file rebuilt") +} + +// Watch the Doodle source tree for changes to Go files and rebuild +// the wasm binary automatically. +func watchChanges() { + watcher, err := fsnotify.NewWatcher() + if err != nil { + log.Printf("error: %s", err) + return + } + defer watcher.Close() + + done := make(chan bool) + go func() { + log.Println("Starting watch files loop") + for { + select { + case event, ok := <-watcher.Events: + if !ok { + return + } + + log.Printf("event: %s", event) + if event.Op&fsnotify.Write == fsnotify.Write { + log.Printf("modified file: %s", event.Name) + onChange() + } + case err, ok := <-watcher.Errors: + if !ok { + return + } + + log.Printf("error: %s", err) + } + } + }() + + log.Println("Adding source directory to watcher") + dirs := crawlDirectory("../") + + // Watch all these folders. + for _, dir := range dirs { + err = watcher.Add(dir) + if err != nil { + log.Printf("error: %s", err) + } + } + <-done +} + +// Crawl the filesystem and return paths with Go files. +func crawlDirectory(root string) []string { + var ( + ext = ".go" + result []string + has bool + ) + + files, err := ioutil.ReadDir(root) + if err != nil { + log.Fatalln(err) + } + + for _, file := range files { + if file.Name() == ".git" { + continue + } + + // Recursively scan subdirectories. + if file.IsDir() { + result = append(result, + crawlDirectory(filepath.Join(root, file.Name()))..., + ) + continue + } + + // This root has a file we want? + if filepath.Ext(file.Name()) == ext { + has = true + } + } + + if has { + result = append(result, root) + } + + return result +} diff --git a/examples/ripple/wasm_exec.js b/examples/ripple/wasm_exec.js new file mode 100644 index 0000000..a54bb9a --- /dev/null +++ b/examples/ripple/wasm_exec.js @@ -0,0 +1,533 @@ +// Copyright 2018 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +(() => { + // Map multiple JavaScript environments to a single common API, + // preferring web standards over Node.js API. + // + // Environments considered: + // - Browsers + // - Node.js + // - Electron + // - Parcel + + if (typeof global !== "undefined") { + // global already exists + } else if (typeof window !== "undefined") { + window.global = window; + } else if (typeof self !== "undefined") { + self.global = self; + } else { + throw new Error("cannot export Go (neither global, window nor self is defined)"); + } + + if (!global.require && typeof require !== "undefined") { + global.require = require; + } + + if (!global.fs && global.require) { + global.fs = require("fs"); + } + + if (!global.fs) { + let outputBuf = ""; + global.fs = { + constants: { O_WRONLY: -1, O_RDWR: -1, O_CREAT: -1, O_TRUNC: -1, O_APPEND: -1, O_EXCL: -1 }, // unused + writeSync(fd, buf) { + outputBuf += decoder.decode(buf); + const nl = outputBuf.lastIndexOf("\n"); + if (nl != -1) { + console.log(outputBuf.substr(0, nl)); + outputBuf = outputBuf.substr(nl + 1); + } + return buf.length; + }, + write(fd, buf, offset, length, position, callback) { + if (offset !== 0 || length !== buf.length || position !== null) { + throw new Error("not implemented"); + } + const n = this.writeSync(fd, buf); + callback(null, n); + }, + open(path, flags, mode, callback) { + const err = new Error("not implemented"); + err.code = "ENOSYS"; + callback(err); + }, + read(fd, buffer, offset, length, position, callback) { + const err = new Error("not implemented"); + err.code = "ENOSYS"; + callback(err); + }, + fsync(fd, callback) { + callback(null); + }, + }; + } + + if (!global.crypto) { + const nodeCrypto = require("crypto"); + global.crypto = { + getRandomValues(b) { + nodeCrypto.randomFillSync(b); + }, + }; + } + + if (!global.performance) { + global.performance = { + now() { + const [sec, nsec] = process.hrtime(); + return sec * 1000 + nsec / 1000000; + }, + }; + } + + if (!global.TextEncoder) { + global.TextEncoder = require("util").TextEncoder; + } + + if (!global.TextDecoder) { + global.TextDecoder = require("util").TextDecoder; + } + + // End of polyfills for common API. + + const encoder = new TextEncoder("utf-8"); + const decoder = new TextDecoder("utf-8"); + + global.Go = class { + constructor() { + this.argv = ["js"]; + this.env = {}; + this.exit = (code) => { + if (code !== 0) { + console.warn("exit code:", code); + } + }; + this._exitPromise = new Promise((resolve) => { + this._resolveExitPromise = resolve; + }); + this._pendingEvent = null; + this._scheduledTimeouts = new Map(); + this._nextCallbackTimeoutID = 1; + + const mem = () => { + // The buffer may change when requesting more memory. + return new DataView(this._inst.exports.mem.buffer); + } + + const setInt64 = (addr, v) => { + mem().setUint32(addr + 0, v, true); + mem().setUint32(addr + 4, Math.floor(v / 4294967296), true); + } + + const getInt64 = (addr) => { + const low = mem().getUint32(addr + 0, true); + const high = mem().getInt32(addr + 4, true); + return low + high * 4294967296; + } + + const loadValue = (addr) => { + const f = mem().getFloat64(addr, true); + if (f === 0) { + return undefined; + } + if (!isNaN(f)) { + return f; + } + + const id = mem().getUint32(addr, true); + return this._values[id]; + } + + const storeValue = (addr, v) => { + const nanHead = 0x7FF80000; + + if (typeof v === "number") { + if (isNaN(v)) { + mem().setUint32(addr + 4, nanHead, true); + mem().setUint32(addr, 0, true); + return; + } + if (v === 0) { + mem().setUint32(addr + 4, nanHead, true); + mem().setUint32(addr, 1, true); + return; + } + mem().setFloat64(addr, v, true); + return; + } + + switch (v) { + case undefined: + mem().setFloat64(addr, 0, true); + return; + case null: + mem().setUint32(addr + 4, nanHead, true); + mem().setUint32(addr, 2, true); + return; + case true: + mem().setUint32(addr + 4, nanHead, true); + mem().setUint32(addr, 3, true); + return; + case false: + mem().setUint32(addr + 4, nanHead, true); + mem().setUint32(addr, 4, true); + return; + } + + let ref = this._refs.get(v); + if (ref === undefined) { + ref = this._values.length; + this._values.push(v); + this._refs.set(v, ref); + } + let typeFlag = 0; + switch (typeof v) { + case "string": + typeFlag = 1; + break; + case "symbol": + typeFlag = 2; + break; + case "function": + typeFlag = 3; + break; + } + mem().setUint32(addr + 4, nanHead | typeFlag, true); + mem().setUint32(addr, ref, true); + } + + const loadSlice = (addr) => { + const array = getInt64(addr + 0); + const len = getInt64(addr + 8); + return new Uint8Array(this._inst.exports.mem.buffer, array, len); + } + + const loadSliceOfValues = (addr) => { + const array = getInt64(addr + 0); + const len = getInt64(addr + 8); + const a = new Array(len); + for (let i = 0; i < len; i++) { + a[i] = loadValue(array + i * 8); + } + return a; + } + + const loadString = (addr) => { + const saddr = getInt64(addr + 0); + const len = getInt64(addr + 8); + return decoder.decode(new DataView(this._inst.exports.mem.buffer, saddr, len)); + } + + const timeOrigin = Date.now() - performance.now(); + this.importObject = { + go: { + // Go's SP does not change as long as no Go code is running. Some operations (e.g. calls, getters and setters) + // may synchronously trigger a Go event handler. This makes Go code get executed in the middle of the imported + // function. A goroutine can switch to a new stack if the current stack is too small (see morestack function). + // This changes the SP, thus we have to update the SP used by the imported function. + + // func wasmExit(code int32) + "runtime.wasmExit": (sp) => { + const code = mem().getInt32(sp + 8, true); + this.exited = true; + delete this._inst; + delete this._values; + delete this._refs; + this.exit(code); + }, + + // func wasmWrite(fd uintptr, p unsafe.Pointer, n int32) + "runtime.wasmWrite": (sp) => { + const fd = getInt64(sp + 8); + const p = getInt64(sp + 16); + const n = mem().getInt32(sp + 24, true); + fs.writeSync(fd, new Uint8Array(this._inst.exports.mem.buffer, p, n)); + }, + + // func nanotime() int64 + "runtime.nanotime": (sp) => { + setInt64(sp + 8, (timeOrigin + performance.now()) * 1000000); + }, + + // func walltime() (sec int64, nsec int32) + "runtime.walltime": (sp) => { + const msec = (new Date).getTime(); + setInt64(sp + 8, msec / 1000); + mem().setInt32(sp + 16, (msec % 1000) * 1000000, true); + }, + + // func scheduleTimeoutEvent(delay int64) int32 + "runtime.scheduleTimeoutEvent": (sp) => { + const id = this._nextCallbackTimeoutID; + this._nextCallbackTimeoutID++; + this._scheduledTimeouts.set(id, setTimeout( + () => { + this._resume(); + while (this._scheduledTimeouts.has(id)) { + // for some reason Go failed to register the timeout event, log and try again + // (temporary workaround for https://github.com/golang/go/issues/28975) + console.warn("scheduleTimeoutEvent: missed timeout event"); + this._resume(); + } + }, + getInt64(sp + 8) + 1, // setTimeout has been seen to fire up to 1 millisecond early + )); + mem().setInt32(sp + 16, id, true); + }, + + // func clearTimeoutEvent(id int32) + "runtime.clearTimeoutEvent": (sp) => { + const id = mem().getInt32(sp + 8, true); + clearTimeout(this._scheduledTimeouts.get(id)); + this._scheduledTimeouts.delete(id); + }, + + // func getRandomData(r []byte) + "runtime.getRandomData": (sp) => { + crypto.getRandomValues(loadSlice(sp + 8)); + }, + + // func stringVal(value string) ref + "syscall/js.stringVal": (sp) => { + storeValue(sp + 24, loadString(sp + 8)); + }, + + // func valueGet(v ref, p string) ref + "syscall/js.valueGet": (sp) => { + const result = Reflect.get(loadValue(sp + 8), loadString(sp + 16)); + sp = this._inst.exports.getsp(); // see comment above + storeValue(sp + 32, result); + }, + + // func valueSet(v ref, p string, x ref) + "syscall/js.valueSet": (sp) => { + Reflect.set(loadValue(sp + 8), loadString(sp + 16), loadValue(sp + 32)); + }, + + // func valueIndex(v ref, i int) ref + "syscall/js.valueIndex": (sp) => { + storeValue(sp + 24, Reflect.get(loadValue(sp + 8), getInt64(sp + 16))); + }, + + // valueSetIndex(v ref, i int, x ref) + "syscall/js.valueSetIndex": (sp) => { + Reflect.set(loadValue(sp + 8), getInt64(sp + 16), loadValue(sp + 24)); + }, + + // func valueCall(v ref, m string, args []ref) (ref, bool) + "syscall/js.valueCall": (sp) => { + try { + const v = loadValue(sp + 8); + const m = Reflect.get(v, loadString(sp + 16)); + const args = loadSliceOfValues(sp + 32); + const result = Reflect.apply(m, v, args); + sp = this._inst.exports.getsp(); // see comment above + storeValue(sp + 56, result); + mem().setUint8(sp + 64, 1); + } catch (err) { + storeValue(sp + 56, err); + mem().setUint8(sp + 64, 0); + } + }, + + // func valueInvoke(v ref, args []ref) (ref, bool) + "syscall/js.valueInvoke": (sp) => { + try { + const v = loadValue(sp + 8); + const args = loadSliceOfValues(sp + 16); + const result = Reflect.apply(v, undefined, args); + sp = this._inst.exports.getsp(); // see comment above + storeValue(sp + 40, result); + mem().setUint8(sp + 48, 1); + } catch (err) { + storeValue(sp + 40, err); + mem().setUint8(sp + 48, 0); + } + }, + + // func valueNew(v ref, args []ref) (ref, bool) + "syscall/js.valueNew": (sp) => { + try { + const v = loadValue(sp + 8); + const args = loadSliceOfValues(sp + 16); + const result = Reflect.construct(v, args); + sp = this._inst.exports.getsp(); // see comment above + storeValue(sp + 40, result); + mem().setUint8(sp + 48, 1); + } catch (err) { + storeValue(sp + 40, err); + mem().setUint8(sp + 48, 0); + } + }, + + // func valueLength(v ref) int + "syscall/js.valueLength": (sp) => { + setInt64(sp + 16, parseInt(loadValue(sp + 8).length)); + }, + + // valuePrepareString(v ref) (ref, int) + "syscall/js.valuePrepareString": (sp) => { + const str = encoder.encode(String(loadValue(sp + 8))); + storeValue(sp + 16, str); + setInt64(sp + 24, str.length); + }, + + // valueLoadString(v ref, b []byte) + "syscall/js.valueLoadString": (sp) => { + const str = loadValue(sp + 8); + loadSlice(sp + 16).set(str); + }, + + // func valueInstanceOf(v ref, t ref) bool + "syscall/js.valueInstanceOf": (sp) => { + mem().setUint8(sp + 24, loadValue(sp + 8) instanceof loadValue(sp + 16)); + }, + + // func copyBytesToGo(dst []byte, src ref) (int, bool) + "syscall/js.copyBytesToGo": (sp) => { + const dst = loadSlice(sp + 8); + const src = loadValue(sp + 32); + if (!(src instanceof Uint8Array)) { + mem().setUint8(sp + 48, 0); + return; + } + const toCopy = src.subarray(0, dst.length); + dst.set(toCopy); + setInt64(sp + 40, toCopy.length); + mem().setUint8(sp + 48, 1); + }, + + // func copyBytesToJS(dst ref, src []byte) (int, bool) + "syscall/js.copyBytesToJS": (sp) => { + const dst = loadValue(sp + 8); + const src = loadSlice(sp + 16); + if (!(dst instanceof Uint8Array)) { + mem().setUint8(sp + 48, 0); + return; + } + const toCopy = src.subarray(0, dst.length); + dst.set(toCopy); + setInt64(sp + 40, toCopy.length); + mem().setUint8(sp + 48, 1); + }, + + "debug": (value) => { + console.log(value); + }, + } + }; + } + + async run(instance) { + this._inst = instance; + this._values = [ // TODO: garbage collection + NaN, + 0, + null, + true, + false, + global, + this, + ]; + this._refs = new Map(); + this.exited = false; + + const mem = new DataView(this._inst.exports.mem.buffer) + + // Pass command line arguments and environment variables to WebAssembly by writing them to the linear memory. + let offset = 4096; + + const strPtr = (str) => { + const ptr = offset; + const bytes = encoder.encode(str + "\0"); + new Uint8Array(mem.buffer, offset, bytes.length).set(bytes); + offset += bytes.length; + if (offset % 8 !== 0) { + offset += 8 - (offset % 8); + } + return ptr; + }; + + const argc = this.argv.length; + + const argvPtrs = []; + this.argv.forEach((arg) => { + argvPtrs.push(strPtr(arg)); + }); + + const keys = Object.keys(this.env).sort(); + argvPtrs.push(keys.length); + keys.forEach((key) => { + argvPtrs.push(strPtr(`${key}=${this.env[key]}`)); + }); + + const argv = offset; + argvPtrs.forEach((ptr) => { + mem.setUint32(offset, ptr, true); + mem.setUint32(offset + 4, 0, true); + offset += 8; + }); + + this._inst.exports.run(argc, argv); + if (this.exited) { + this._resolveExitPromise(); + } + await this._exitPromise; + } + + _resume() { + if (this.exited) { + throw new Error("Go program has already exited"); + } + this._inst.exports.resume(); + if (this.exited) { + this._resolveExitPromise(); + } + } + + _makeFuncWrapper(id) { + const go = this; + return function () { + const event = { id: id, this: this, args: arguments }; + go._pendingEvent = event; + go._resume(); + return event.result; + }; + } + } + + if ( + global.require && + global.require.main === module && + global.process && + global.process.versions && + !global.process.versions.electron + ) { + if (process.argv.length < 3) { + console.error("usage: go_js_wasm_exec [wasm binary] [arguments]"); + process.exit(1); + } + + const go = new Go(); + go.argv = process.argv.slice(2); + go.env = Object.assign({ TMPDIR: require("os").tmpdir() }, process.env); + go.exit = process.exit; + WebAssembly.instantiate(fs.readFileSync(process.argv[2]), go.importObject).then((result) => { + process.on("exit", (code) => { // Node.js exits if no event handler is pending + if (code === 0 && !go.exited) { + // deadlock, make Go print error and stack traces + go._pendingEvent = { id: 0 }; + go._resume(); + } + }); + return go.run(result.instance); + }).catch((err) => { + console.error(err); + process.exit(1); + }); + } +})(); diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..993baa2 --- /dev/null +++ b/go.mod @@ -0,0 +1,14 @@ +module git.kirsle.net/go/applets + +go 1.13 + +replace git.kirsle.net/go/ui => /home/kirsle/go/src/git.kirsle.net/go/ui + +replace git.kirsle.net/go/render => /home/kirsle/go/src/git.kirsle.net/go/render + +require ( + git.kirsle.net/go/render v0.0.0-20200102014411-4d008b5c468d + git.kirsle.net/go/ui v0.0.0-20191229080003-4ba563d48d6f + github.com/fsnotify/fsnotify v1.4.7 // indirect + golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..c84248f --- /dev/null +++ b/go.sum @@ -0,0 +1,13 @@ +git.kirsle.net/go/render v0.0.0-20200102014411-4d008b5c468d h1:vErak6oVRT2dosyQzcwkjXyWQ2NRIVL8q9R8NOUTtsg= +git.kirsle.net/go/render v0.0.0-20200102014411-4d008b5c468d/go.mod h1:ywZtC+zE2SpeObfkw0OvG01pWHQadsVQ4WDKOYzaejc= +git.kirsle.net/go/ui v0.0.0-20191229080003-4ba563d48d6f h1:upiac1ipv6cx0Um9uPSHTtwqVpmY1nctJi6mMxFdHTM= +git.kirsle.net/go/ui v0.0.0-20191229080003-4ba563d48d6f/go.mod h1:MWMEQKnc2LOKK9yXO49FxkAdt9uiTvVQPZH7N5tIXhY= +github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I= +github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo= +github.com/veandco/go-sdl2 v0.4.1 h1:HmSBvVmKWI8LAOeCfTTM8R33rMyPcs6U3o8n325c9Qg= +github.com/veandco/go-sdl2 v0.4.1/go.mod h1:FB+kTpX9YTE+urhYiClnRzpOXbiWgaU3+5F2AB78DPg= +golang.org/x/image v0.0.0-20200119044424-58c23975cae1 h1:5h3ngYt7+vXCDZCup/HkCQgW5XwmSvR/nA2JmJ0RErg= +golang.org/x/image v0.0.0-20200119044424-58c23975cae1/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0= +golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae h1:/WDfKMnPU+m5M4xB+6x4kaepxRw6jWvR5iDRdvjHgy8= +golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= +golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=