Browse Source

Initial SDL2 Ripple applet

master
Noah Petherbridge 3 years ago
commit
9cf3a96bfb
  1. 1
      .gitignore
  2. 1
      README.md
  3. 11
      examples/ripple/Makefile
  4. 41
      examples/ripple/index.html
  5. 114
      examples/ripple/main.go
  6. 136
      examples/ripple/main_wasm.go
  7. BIN
      examples/ripple/photo.jpg
  8. 123
      examples/ripple/ripple.go
  9. 127
      examples/ripple/server.go
  10. 533
      examples/ripple/wasm_exec.js
  11. 14
      go.mod
  12. 13
      go.sum

1
.gitignore

@ -0,0 +1 @@
*.wasm

1
README.md

@ -0,0 +1 @@
# WebAssembly Applets

11
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

41
examples/ripple/index.html

@ -0,0 +1,41 @@
<!DOCTYPE html>
<html>
<head>
<title>go/render: hello wasm!</title>
<style>
#canvas {
position: fixed;
width: 100%;
height: 100%;
top: 0;
right: 0;
left: 0;
bottom: 0;
}
</style>
</head>
<body>
<script src="wasm_exec.js"></script>
<script>
if (!WebAssembly.instantiateStreaming) { // polyfill
WebAssembly.instantiateStreaming = async (resp, importObject) => {
const source = await (await resp).arrayBuffer();
return await WebAssembly.instantiate(source, importObject);
};
}
(function() {
const go = new Go();
WebAssembly.instantiateStreaming(fetch("ripple.wasm"), go.importObject).then(result => {
console.clear();
go.run(result.instance);
WebAssembly.instantiate(result.module, go.importObject); // reset instance
})
})();
</script>
<canvas id="canvas"></canvas>
</body>
</html>

114
examples/ripple/main.go

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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
}
}
}

136
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
}
}
}

BIN
examples/ripple/photo.jpg

Binary file not shown.

After

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123
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()
}

127
examples/ripple/server.go

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// +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
}

533
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);
});
}
})();

14
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
)

13
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=
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