Dust off WASM build support
parent
da83231559
commit
9cce93f431
26
Building.md
26
Building.md
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@ -278,6 +278,32 @@ cp /usr/x86_64-w64-mingw32/bin/SDL*.dll bin/
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SDL2_ttf requires libfreetype, you can get its DLL here:
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https://github.com/ubawurinna/freetype-windows-binaries
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# WebAssembly
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There is some **experimental** support for a WebAssembly build of Sketchy Maze
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since the very early days. Early on, the game "basically worked" but performance
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could be awful: playing levels was OK but clicking and dragging in the editor
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would cause your browser to freeze. Then for a time, the game wouldn't even get
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that far. Recently (December 2023), WASM performance seems much better but there
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are strange graphical glitches:
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* On the title screen, the example levels in the background load OK and their
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doodads will wander around and performance seems OK.
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* But during Play Mode, only the menu bar draws but nothing else on the screen.
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* In the Level Editor, the entire screen is white BUT tooltips will appear and
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the menu bar can be clicked on (blindly) and the drop-down menus do appear.
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Some popups like the Palette Editor can be invoked and draw to varying degrees
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of success.
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Some tips to get a WASM build to work:
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* For fonts: symlink it so that ./wasm/fonts points to ./assets/fonts.
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* You may need an updated wasm_exec.js shim from Go. On Fedora,
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`dnf install golang-misc` and `cp "$(go env GOROOT)/misc/wasm/wasm_exec.js" .`
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from the wasm/ folder.
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* Run `make wasm` to build the WASM binary and `make wasm-serve` to run a simple
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Go web server to serve it from.
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# Old Docs
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## Build Tags
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@ -8,9 +8,9 @@ import (
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"git.kirsle.net/SketchyMaze/doodle/pkg/balance"
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"git.kirsle.net/SketchyMaze/doodle/pkg/collision"
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"git.kirsle.net/SketchyMaze/doodle/pkg/drawtool"
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"git.kirsle.net/SketchyMaze/doodle/pkg/native"
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"git.kirsle.net/SketchyMaze/doodle/pkg/uix"
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"git.kirsle.net/go/render"
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"git.kirsle.net/go/render/sdl"
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"git.kirsle.net/go/ui"
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)
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@ -65,10 +65,7 @@ func (d *Doodle) DrawDebugOverlay() {
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}
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// Get the size of cached SDL2 textures at the render engine level.
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var texCount = "n/a"
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if sdl, ok := d.Engine.(*sdl.Renderer); ok {
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texCount = fmt.Sprintf("%d", sdl.CountTextures())
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}
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var texCount = native.CountTextures(d.Engine)
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var (
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darken = balance.DebugStrokeDarken
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@ -8,6 +8,7 @@ import (
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"image/png"
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"os"
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"path/filepath"
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"runtime"
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"time"
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"git.kirsle.net/SketchyMaze/doodle/pkg/balance"
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@ -21,6 +22,11 @@ import (
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// CroppedScreenshot returns a rendered RGBA image of the level.
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func CroppedScreenshot(lvl *level.Level, viewport render.Rect) (image.Image, error) {
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// Not for WASM for now.
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if runtime.GOOS == "js" {
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return nil, errors.New("screenshots not yet supported for WASM")
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}
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// Lock this to one user at a time.
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if locked {
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return nil, errors.New("a screenshot is still being processed; try later...")
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@ -5,6 +5,7 @@ package native
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import (
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"errors"
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"fmt"
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"image"
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"git.kirsle.net/SketchyMaze/doodle/pkg/shmem"
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@ -33,6 +34,15 @@ func CopyToClipboard(text string) error {
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return errors.New("not supported")
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}
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// CountTextures returns the count of loaded SDL2 textures, for the F3 debug overlay, or "n/a"
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func CountTextures(e render.Engine) string {
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var texCount = "n/a"
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if sdl, ok := e.(*sdl.Renderer); ok {
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texCount = fmt.Sprintf("%d", sdl.CountTextures())
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}
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return texCount
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}
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/*
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TextToImage takes an SDL2_TTF texture and makes it into a Go image.
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@ -4,6 +4,7 @@
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package native
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import (
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"errors"
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"image"
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"git.kirsle.net/go/render"
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@ -20,3 +21,7 @@ func TextToImage(e render.Engine, text render.Text) (image.Image, error) {
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func CopyToClipboard(text string) error {
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return errors.New("not supported on WASM")
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}
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func CountTextures(e render.Engine) string {
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return "n/a"
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}
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@ -1,3 +1,4 @@
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//go:build js && wasm
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// +build js,wasm
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package main
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@ -38,7 +39,7 @@ func main() {
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game.SetWindowSize(w, h)
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// game.Goto(&doodle.GUITestScene{})
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game.Goto(&doodle.EditorScene{})
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// game.Goto(&doodle.EditorScene{})
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game.Run()
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}
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@ -1,3 +1,4 @@
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//go:build disabled
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// +build disabled
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package main
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@ -9,15 +10,13 @@ import (
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"net/http"
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"os/exec"
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"path/filepath"
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"github.com/fsnotify/fsnotify"
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)
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func main() {
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const wasm = "/doodle.wasm"
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// Watch the dev directory for changes.
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go watchChanges()
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// go watchChanges()
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http.Handle("/", http.FileServer(http.Dir(".")))
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http.HandleFunc(wasm, func(w http.ResponseWriter, r *http.Request) {
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@ -41,6 +40,7 @@ func onChange() {
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// Watch the Doodle source tree for changes to Go files and rebuild
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// the wasm binary automatically.
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/*
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func watchChanges() {
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watcher, err := fsnotify.NewWatcher()
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if err != nil {
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@ -86,6 +86,7 @@ func watchChanges() {
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}
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<-done
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}
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*/
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// Crawl the filesystem and return paths with Go files.
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func crawlDirectory(root string) []string {
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@ -2,53 +2,25 @@
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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"use strict";
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(() => {
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// Map multiple JavaScript environments to a single common API,
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// preferring web standards over Node.js API.
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//
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// Environments considered:
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// - Browsers
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// - Node.js
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// - Electron
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// - Parcel
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if (typeof global !== "undefined") {
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// global already exists
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} else if (typeof window !== "undefined") {
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window.global = window;
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} else if (typeof self !== "undefined") {
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self.global = self;
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} else {
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throw new Error("cannot export Go (neither global, window nor self is defined)");
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}
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if (!global.require && typeof require !== "undefined") {
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global.require = require;
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}
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if (!global.fs && global.require) {
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const fs = require("fs");
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if (Object.keys(fs) !== 0) {
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global.fs = fs;
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}
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}
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const enosys = () => {
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const err = new Error("not implemented");
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err.code = "ENOSYS";
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return err;
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};
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if (!global.fs) {
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if (!globalThis.fs) {
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let outputBuf = "";
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global.fs = {
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globalThis.fs = {
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constants: { O_WRONLY: -1, O_RDWR: -1, O_CREAT: -1, O_TRUNC: -1, O_APPEND: -1, O_EXCL: -1 }, // unused
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writeSync(fd, buf) {
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outputBuf += decoder.decode(buf);
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const nl = outputBuf.lastIndexOf("\n");
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if (nl != -1) {
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console.log(outputBuf.substr(0, nl));
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outputBuf = outputBuf.substr(nl + 1);
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console.log(outputBuf.substring(0, nl));
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outputBuf = outputBuf.substring(nl + 1);
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}
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return buf.length;
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},
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@ -86,8 +58,8 @@
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};
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}
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if (!global.process) {
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global.process = {
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if (!globalThis.process) {
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globalThis.process = {
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getuid() { return -1; },
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getgid() { return -1; },
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geteuid() { return -1; },
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@ -101,38 +73,26 @@
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}
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}
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if (!global.crypto) {
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const nodeCrypto = require("crypto");
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global.crypto = {
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getRandomValues(b) {
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nodeCrypto.randomFillSync(b);
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},
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};
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if (!globalThis.crypto) {
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throw new Error("globalThis.crypto is not available, polyfill required (crypto.getRandomValues only)");
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}
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if (!global.performance) {
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global.performance = {
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now() {
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const [sec, nsec] = process.hrtime();
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return sec * 1000 + nsec / 1000000;
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},
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};
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if (!globalThis.performance) {
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throw new Error("globalThis.performance is not available, polyfill required (performance.now only)");
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}
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if (!global.TextEncoder) {
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global.TextEncoder = require("util").TextEncoder;
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if (!globalThis.TextEncoder) {
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throw new Error("globalThis.TextEncoder is not available, polyfill required");
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}
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if (!global.TextDecoder) {
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global.TextDecoder = require("util").TextDecoder;
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if (!globalThis.TextDecoder) {
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throw new Error("globalThis.TextDecoder is not available, polyfill required");
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}
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// End of polyfills for common API.
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const encoder = new TextEncoder("utf-8");
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const decoder = new TextDecoder("utf-8");
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global.Go = class {
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globalThis.Go = class {
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constructor() {
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this.argv = ["js"];
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this.env = {};
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@ -153,6 +113,10 @@
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this.mem.setUint32(addr + 4, Math.floor(v / 4294967296), true);
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}
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const setInt32 = (addr, v) => {
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this.mem.setUint32(addr + 0, v, true);
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}
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const getInt64 = (addr) => {
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const low = this.mem.getUint32(addr + 0, true);
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const high = this.mem.getInt32(addr + 4, true);
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@ -246,7 +210,10 @@
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const timeOrigin = Date.now() - performance.now();
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this.importObject = {
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go: {
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_gotest: {
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add: (a, b) => a + b,
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},
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gojs: {
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// Go's SP does not change as long as no Go code is running. Some operations (e.g. calls, getters and setters)
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// may synchronously trigger a Go event handler. This makes Go code get executed in the middle of the imported
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// function. A goroutine can switch to a new stack if the current stack is too small (see morestack function).
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@ -254,6 +221,7 @@
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// func wasmExit(code int32)
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"runtime.wasmExit": (sp) => {
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sp >>>= 0;
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const code = this.mem.getInt32(sp + 8, true);
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this.exited = true;
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delete this._inst;
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@ -266,6 +234,7 @@
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// func wasmWrite(fd uintptr, p unsafe.Pointer, n int32)
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"runtime.wasmWrite": (sp) => {
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sp >>>= 0;
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const fd = getInt64(sp + 8);
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const p = getInt64(sp + 16);
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const n = this.mem.getInt32(sp + 24, true);
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@ -274,16 +243,19 @@
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// func resetMemoryDataView()
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"runtime.resetMemoryDataView": (sp) => {
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sp >>>= 0;
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this.mem = new DataView(this._inst.exports.mem.buffer);
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},
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// func nanotime1() int64
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"runtime.nanotime1": (sp) => {
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sp >>>= 0;
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setInt64(sp + 8, (timeOrigin + performance.now()) * 1000000);
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},
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// func walltime1() (sec int64, nsec int32)
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"runtime.walltime1": (sp) => {
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// func walltime() (sec int64, nsec int32)
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"runtime.walltime": (sp) => {
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sp >>>= 0;
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const msec = (new Date).getTime();
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setInt64(sp + 8, msec / 1000);
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this.mem.setInt32(sp + 16, (msec % 1000) * 1000000, true);
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@ -291,6 +263,7 @@
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// func scheduleTimeoutEvent(delay int64) int32
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"runtime.scheduleTimeoutEvent": (sp) => {
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sp >>>= 0;
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const id = this._nextCallbackTimeoutID;
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this._nextCallbackTimeoutID++;
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this._scheduledTimeouts.set(id, setTimeout(
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@ -303,13 +276,14 @@
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this._resume();
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}
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},
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getInt64(sp + 8) + 1, // setTimeout has been seen to fire up to 1 millisecond early
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getInt64(sp + 8),
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));
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this.mem.setInt32(sp + 16, id, true);
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},
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// func clearTimeoutEvent(id int32)
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"runtime.clearTimeoutEvent": (sp) => {
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sp >>>= 0;
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const id = this.mem.getInt32(sp + 8, true);
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clearTimeout(this._scheduledTimeouts.get(id));
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this._scheduledTimeouts.delete(id);
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@ -317,11 +291,13 @@
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// func getRandomData(r []byte)
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"runtime.getRandomData": (sp) => {
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sp >>>= 0;
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crypto.getRandomValues(loadSlice(sp + 8));
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},
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// func finalizeRef(v ref)
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"syscall/js.finalizeRef": (sp) => {
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sp >>>= 0;
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const id = this.mem.getUint32(sp + 8, true);
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this._goRefCounts[id]--;
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if (this._goRefCounts[id] === 0) {
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@ -334,47 +310,55 @@
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// func stringVal(value string) ref
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"syscall/js.stringVal": (sp) => {
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sp >>>= 0;
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storeValue(sp + 24, loadString(sp + 8));
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},
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// func valueGet(v ref, p string) ref
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"syscall/js.valueGet": (sp) => {
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sp >>>= 0;
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const result = Reflect.get(loadValue(sp + 8), loadString(sp + 16));
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sp = this._inst.exports.getsp(); // see comment above
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sp = this._inst.exports.getsp() >>> 0; // see comment above
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storeValue(sp + 32, result);
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},
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// func valueSet(v ref, p string, x ref)
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"syscall/js.valueSet": (sp) => {
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sp >>>= 0;
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Reflect.set(loadValue(sp + 8), loadString(sp + 16), loadValue(sp + 32));
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},
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// func valueDelete(v ref, p string)
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"syscall/js.valueDelete": (sp) => {
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sp >>>= 0;
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Reflect.deleteProperty(loadValue(sp + 8), loadString(sp + 16));
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},
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// func valueIndex(v ref, i int) ref
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"syscall/js.valueIndex": (sp) => {
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sp >>>= 0;
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storeValue(sp + 24, Reflect.get(loadValue(sp + 8), getInt64(sp + 16)));
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},
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// valueSetIndex(v ref, i int, x ref)
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"syscall/js.valueSetIndex": (sp) => {
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sp >>>= 0;
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Reflect.set(loadValue(sp + 8), getInt64(sp + 16), loadValue(sp + 24));
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},
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// func valueCall(v ref, m string, args []ref) (ref, bool)
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"syscall/js.valueCall": (sp) => {
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sp >>>= 0;
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try {
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const v = loadValue(sp + 8);
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const m = Reflect.get(v, loadString(sp + 16));
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const args = loadSliceOfValues(sp + 32);
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const result = Reflect.apply(m, v, args);
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sp = this._inst.exports.getsp(); // see comment above
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sp = this._inst.exports.getsp() >>> 0; // see comment above
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storeValue(sp + 56, result);
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this.mem.setUint8(sp + 64, 1);
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} catch (err) {
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sp = this._inst.exports.getsp() >>> 0; // see comment above
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storeValue(sp + 56, err);
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this.mem.setUint8(sp + 64, 0);
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}
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@ -382,14 +366,16 @@
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// func valueInvoke(v ref, args []ref) (ref, bool)
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"syscall/js.valueInvoke": (sp) => {
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sp >>>= 0;
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try {
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const v = loadValue(sp + 8);
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const args = loadSliceOfValues(sp + 16);
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const result = Reflect.apply(v, undefined, args);
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sp = this._inst.exports.getsp(); // see comment above
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sp = this._inst.exports.getsp() >>> 0; // see comment above
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storeValue(sp + 40, result);
|
||||
this.mem.setUint8(sp + 48, 1);
|
||||
} catch (err) {
|
||||
sp = this._inst.exports.getsp() >>> 0; // see comment above
|
||||
storeValue(sp + 40, err);
|
||||
this.mem.setUint8(sp + 48, 0);
|
||||
}
|
||||
|
|
@ -397,14 +383,16 @@
|
|||
|
||||
// func valueNew(v ref, args []ref) (ref, bool)
|
||||
"syscall/js.valueNew": (sp) => {
|
||||
sp >>>= 0;
|
||||
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
|
||||
sp = this._inst.exports.getsp() >>> 0; // see comment above
|
||||
storeValue(sp + 40, result);
|
||||
this.mem.setUint8(sp + 48, 1);
|
||||
} catch (err) {
|
||||
sp = this._inst.exports.getsp() >>> 0; // see comment above
|
||||
storeValue(sp + 40, err);
|
||||
this.mem.setUint8(sp + 48, 0);
|
||||
}
|
||||
|
|
@ -412,11 +400,13 @@
|
|||
|
||||
// func valueLength(v ref) int
|
||||
"syscall/js.valueLength": (sp) => {
|
||||
sp >>>= 0;
|
||||
setInt64(sp + 16, parseInt(loadValue(sp + 8).length));
|
||||
},
|
||||
|
||||
// valuePrepareString(v ref) (ref, int)
|
||||
"syscall/js.valuePrepareString": (sp) => {
|
||||
sp >>>= 0;
|
||||
const str = encoder.encode(String(loadValue(sp + 8)));
|
||||
storeValue(sp + 16, str);
|
||||
setInt64(sp + 24, str.length);
|
||||
|
|
@ -424,17 +414,20 @@
|
|||
|
||||
// valueLoadString(v ref, b []byte)
|
||||
"syscall/js.valueLoadString": (sp) => {
|
||||
sp >>>= 0;
|
||||
const str = loadValue(sp + 8);
|
||||
loadSlice(sp + 16).set(str);
|
||||
},
|
||||
|
||||
// func valueInstanceOf(v ref, t ref) bool
|
||||
"syscall/js.valueInstanceOf": (sp) => {
|
||||
sp >>>= 0;
|
||||
this.mem.setUint8(sp + 24, (loadValue(sp + 8) instanceof loadValue(sp + 16)) ? 1 : 0);
|
||||
},
|
||||
|
||||
// func copyBytesToGo(dst []byte, src ref) (int, bool)
|
||||
"syscall/js.copyBytesToGo": (sp) => {
|
||||
sp >>>= 0;
|
||||
const dst = loadSlice(sp + 8);
|
||||
const src = loadValue(sp + 32);
|
||||
if (!(src instanceof Uint8Array || src instanceof Uint8ClampedArray)) {
|
||||
|
|
@ -449,6 +442,7 @@
|
|||
|
||||
// func copyBytesToJS(dst ref, src []byte) (int, bool)
|
||||
"syscall/js.copyBytesToJS": (sp) => {
|
||||
sp >>>= 0;
|
||||
const dst = loadValue(sp + 8);
|
||||
const src = loadSlice(sp + 16);
|
||||
if (!(dst instanceof Uint8Array || dst instanceof Uint8ClampedArray)) {
|
||||
|
|
@ -469,6 +463,9 @@
|
|||
}
|
||||
|
||||
async run(instance) {
|
||||
if (!(instance instanceof WebAssembly.Instance)) {
|
||||
throw new Error("Go.run: WebAssembly.Instance expected");
|
||||
}
|
||||
this._inst = instance;
|
||||
this.mem = new DataView(this._inst.exports.mem.buffer);
|
||||
this._values = [ // JS values that Go currently has references to, indexed by reference id
|
||||
|
|
@ -477,7 +474,7 @@
|
|||
null,
|
||||
true,
|
||||
false,
|
||||
global,
|
||||
globalThis,
|
||||
this,
|
||||
];
|
||||
this._goRefCounts = new Array(this._values.length).fill(Infinity); // number of references that Go has to a JS value, indexed by reference id
|
||||
|
|
@ -486,7 +483,7 @@
|
|||
[null, 2],
|
||||
[true, 3],
|
||||
[false, 4],
|
||||
[global, 5],
|
||||
[globalThis, 5],
|
||||
[this, 6],
|
||||
]);
|
||||
this._idPool = []; // unused ids that have been garbage collected
|
||||
|
|
@ -527,6 +524,13 @@
|
|||
offset += 8;
|
||||
});
|
||||
|
||||
// The linker guarantees global data starts from at least wasmMinDataAddr.
|
||||
// Keep in sync with cmd/link/internal/ld/data.go:wasmMinDataAddr.
|
||||
const wasmMinDataAddr = 4096 + 8192;
|
||||
if (offset >= wasmMinDataAddr) {
|
||||
throw new Error("total length of command line and environment variables exceeds limit");
|
||||
}
|
||||
|
||||
this._inst.exports.run(argc, argv);
|
||||
if (this.exited) {
|
||||
this._resolveExitPromise();
|
||||
|
|
@ -554,35 +558,4 @@
|
|||
};
|
||||
}
|
||||
}
|
||||
|
||||
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);
|
||||
});
|
||||
}
|
||||
})();
|
||||
|
|
|
|||
Loading…
Reference in New Issue