Hi all,
Thanks for this thread, I've been very interested in getting my common
lisp project to run in ECL and Emscripten. A little before the release,
I managed to hack my way through the instructions to get an ECL
Emscripten build working with the dialog prompted ECL terminal. I'd
like to try and work out how to put together the following 2 proof of
concepts as a springboard for future work.
1. Figuring out how to just bundle my entire ASDF project with enough of
it's dependencies, so that I can instantiate something (like a class or
a struct) from my project in the REPL.
2. Figure out how to get an OpenGL triangle working using cl-opengl
along with the glfw or sdl2 support built into Emscripten.
I'm more or less totally new to Emscripten, and I'm in the process of
getting my source to run on ECL (it at least fully loads now and can run
the unit tests with a few passing. It currently has dependencies on
Lispworks, but i'm making fair progress with it getting closer to ECL
and SBCL).
If there are any small projects lying around or pointers I should look
for this bootstrapping process it'd be appreciated.
Thanks!
Steve
On 12/31/23 8:17 AM, Marius Gerbershagen wrote:
Dear Jon,
interacting between Lisp and javascript in a browser can be done by
directly calling functions from ECL's C interface from javascript or
vice-versa using the available methods to call javascript from C and
ECL's C foreign function interface. A description for how to call C
from javascript and vice-versa can be found at
https://emscripten.org/docs/porting/connecting_cpp_and_javascript/Interacting-with-code.html
Another thing to keep in mind is the asynchronous nature of javascript
running in a browser which does not integrate easily with the
synchronous IO interface of Common Lisp. If you want to keep the Lisp
runtime running in the background, waiting for input to arrive, there
are two options: either compile with LDFLAGS="-sASYNCIFY"
(https://emscripten.org/docs/porting/asyncify.html) or run ECL in a
separate thread (by means of a WebWorker) while communicating with the
UI thread via Atomics.wait and SharedArrayBuffer's.
For an example of the latter option, you can look at the ECL repl
https://repl.chee.party/ that Daniel has linked to or also at
https://sourceforge.net/u/mgerbershagen/maxima/ci/emscripten-port/tree/
which contains a very rough early-stage port of the maxima computer
algebra system to a browser environment (in particular the wasm
subdirectory and the src/ecl-port.lisp file are relevant).
Best regards,
Marius Gerbershagen
Am 30.12.23 um 14:39 schrieb Jón Hallur Haraldsson:
Hi,
I've been toying around with the idea to run ecl in the browser since
it is now easy to build it using emscripten.
I have successfully interacted with the runtime using the extremely
awkward "window.prompt" native javascript pop up.
My experience in using ECL is in embedding it in C/C++
Has someone successfully used it to run in the browser without using
the "wasm-draw-to-canvas" and "windows.prompt" REPL
I'm assuming that this has nothing to do with ECL and is purely how
emscripten works.
Can I write a more embedded version which does not require me to
interact through the REPL in the browser.
If anyone has done any similar things I'd really like to hear about
them.
Kindest regards.
Jon Hallur
