pygbag

Python WebAssembly for everyone ( packager + test server )

Intro : https://github.com/pygame-web

Community Documentation : https://pygame-web.github.io

Runs python code directly in modern web browsers, including mobile versions.

Quick Start:

"your.app.folder" must contain a main.py and its loop must be async aware eg:

import asyncio

# Try to declare all your globals at once to facilitate compilation later.
COUNT_DOWN = 3

# Do init here
# Load any assets right now to avoid lag at runtime or network errors.


async def main():
    global COUNT_DOWN

    # avoid this kind declaration, prefer the way above
    COUNT_DOWN = 3

    while True:

        # Do your rendering here, note that it's NOT an infinite loop,
        # and it is fired only when VSYNC occurs
        # Usually 1/60 or more times per seconds on desktop
        # could be less on some mobile devices

        print(f"""

            Hello[{COUNT_DOWN}] from Python

""")
        # pygame.display.update() should go right next line

        await asyncio.sleep(0)  # Very important, and keep it 0

        if not COUNT_DOWN:
            return

        COUNT_DOWN = COUNT_DOWN - 1

# This is the program entry point:
asyncio.run(main())

# Do not add anything from here, especially sys.exit/pygame.quit
# asyncio.run is non-blocking on pygame-wasm and code would be executed
# right before program start main()

Usage:

pip3 install pygbag --user --upgrade
pygbag your.app.folder

Command help:

pygbag --help your.app.folder

Example :

user@pp /data/git/pygbag $ py -m pygbag --help test/main.py
 *pygbag 0.8.2*
115: cache 0.7.2 mismatch, want 0.8.2, cleaning ...

Serving python files from [/data/git/pygbag/test/build/web]

with no security/performance in mind, i'm just a test tool : don't rely on me
usage: __main__.py [-h] [--bind ADDRESS] [--PYBUILD PYBUILD] [--app_name APP_NAME] [--ume_block UME_BLOCK] [--can_close CAN_CLOSE] [--cache CACHE] [--package PACKAGE] [--title TITLE] [--version VERSION] [--build] [--html] [--no_opt] [--archive] [--icon ICON] [--cdn CDN] [--template TEMPLATE] [--ssl SSL]
                   [--port [PORT]]

options:
  -h, --help            show this help message and exit
  --bind ADDRESS        Specify alternate bind address [default: localhost]
  --PYBUILD PYBUILD     Specify python version [default:3.11]
  --app_name APP_NAME   Specify user facing name of application [default:test]
  --ume_block UME_BLOCK
                        Specify wait for user media engagement before running [default:1]
  --can_close CAN_CLOSE
                        Specify if window will ask confirmation for closing [default:0]
  --cache CACHE         md5 based url cache directory
  --package PACKAGE     package name, better make it unique
  --title TITLE         App nice looking name
  --version VERSION     override prebuilt version path [default:0.8.2]
  --build               build only, do not run test server
  --html                build as html with embedded assets (pygame-script)
  --no_opt              turn off assets optimizer
  --archive             make build/web.zip archive for itch.io
  --icon ICON           icon png file 32x32 min should be favicon.png
  --cdn CDN             web site to cache locally [default:https://pygame-web.github.io/archives/0.8/]
  --template TEMPLATE   index.html template [default:default.tmpl]
  --ssl SSL             enable ssl with server.pem and key.pem
  --port [PORT]         Specify alternate port [default: 8000]

unlisted developper options:

--git               force cdn use of pygbag current git github CI build
--dev               change port to 8666 and use local build served on 8000

Now navigate to http://localhost:8000 with a modern internet browser.

Use http://localhost:8000?-i for getting a terminal with repl and a sized down canvas ( http://localhost:8000#debug also does the same )

For pygame-script go to http://localhost:8000/test.html ( for a game folder named "test" with option --html )

V8 based browsers are preferred ( chromium/brave/chrome ... ) starting with 81.0.4044 ( android 4.4 ). Because they set baseline restrictions on WebAssembly loading. Using them while testing ensure proper operation on all browsers

---

NOTES:

• pygbag only provides support for pygame-ce ( pygame community edition )

• safari/chrome mobile will not run until version ios 15.x

• first load will be slower, because setting up local cache from cdn to avoid useless network transfer for getting pygame and cpython prebuilts.

• each time there's a major change in the code/assets/template you must run pygbag your.app.folder but cache will not be destroyed to save bandwidth.

• if you want to reset prebuilts cache, remove the build/web-cache folder in your.app.folder

• pyodide wheels (non-standard wasm) aren't compatible ootb with pygbag runtime

HISTORY:

• pygbag's concepts took roots in a 2016 Panda3D community experiment.

BUILDING:

Pygbag is not only a python module and its python runtimes are stored online ! Rebuilding all the toolchain can be quite hard.

https://github.com/pygame-web/python-wasm-sdk <= build CPython (not pyodide)

The default is to build only pygame, but feel free to fork and add yours.

So read/use pygbag CI to see how to build pygame + the C loader (pymain) and how it is linked it to libpython. For modules loading since 0.6 the default is to use wasm dynamic libraries. wasm wheels info here

https://github.com/pygame-web/pygbag

Default prebuilts CPython + pygame-ce used by pygbag are stored via github pages from the repo https://github.com/pygame-web/archives under versioned folders.

TEST INTERACTIVE REPL 3.11 (default)

TEST INTERACTIVE REPL 3.12 (next)

ADDING STATIC/DYNAMIC MODULES:

see in package.d directory and use vendor/vendor.sh

SUPPORT FOR STATIC/DYNAMIC MODULES:

see in package.d/<vendor>/README.md for module <vendor> specific support

---

vendor readme (if applicable)

GENERIC PYGBAG SUPPORT OR PYGAME MODULE:

for generic help around pygbag

GENERIC CPYTHON WASM:

python.org forum