2019-07-14 16:34:16 +00:00
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Temporary notes on how to build libmoo to web assembly with emscripten.
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2019-07-15 09:36:03 +00:00
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#### emscriptten APIS to look into
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emscripten_set_main_loop();
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2019-07-14 16:34:16 +00:00
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#### How to Build
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mkdir -p bld/emcc
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cd blc/emcc
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2019-11-02 06:34:18 +00:00
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## run configure and make under emconfigure and emmake respectively
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2019-07-14 16:34:16 +00:00
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emconfigure ../../configure --prefix=${HOME}/xxx-emcc --disable-shared --enable-dynamic-module --disable-mod-x11 --disable-mod-con --disable-mod-sck CFLAGS="-Wall -O2 -g"
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emmake make
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2019-11-02 06:34:18 +00:00
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## convert the library to web assembly - the command produces libmoo.js and libmoo.wasm
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2019-07-14 16:34:16 +00:00
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##emcc lib/.libs/libmoo.a -s WASM=1 -s EXPORT_ALL=1 -s LINKABLE=1 -o libmoo.js
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#if you have defined MOO_EXPORT as EMSCRIPTEN_KEEPALIVE, the following will do
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##emcc lib/.libs/libmoo.a -s WASM=1 -s -s LINKABLE=1 -o libmoo.js
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2019-11-02 06:34:18 +00:00
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###emcc lib/.libs/libmoo.a lib/.libs/libmoox.a -s WASM=1 -s LINKABLE=1 -o libmoo.js
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## -s ALLOW_MEMORY_GROWTH=1
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emcc lib/.libs/libmoo.a lib/.libs/libmoox.a -s WASM=1 -s LINKABLE=1 -s EXTRA_EXPORTED_RUNTIME_METHODS="['ccall','cwrap']" -o libmoo.js --embed-file ../../kernel/
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### --embed-file, if given a directory, includes all files under the directory.
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### the result libmoo.js will contain lines like below:
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### Module['FS_createDataFile']('/kernel', 'Apex.moo', fileData35, true, true, false);
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### var fileData36 = [];
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### fileData36.push.apply(fileData36, [35, 105, ...
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###
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## when i executed the command above, some versions of wasm-ld complained like below
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## if the library is compiled with -pthread.
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## wasm-ld: error: 'atomics' feature is disallowed by atomic_2835fb94.c.o, so --shared-memory must not be used
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## a quick work around was to remove -pthread before building with 'emmake make'
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2019-07-15 09:36:03 +00:00
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## if defined some javascript functions in moo.cb.js...
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2019-11-02 06:34:18 +00:00
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emcc -Wall -O2 -g lib/.libs/libmoo.a ws.c -DMOO_HAVE_CFG_H -Ilib -I../../lib -s WASM=1 -s LINKABLE=1 -s EXTRA_EXPORTED_RUNTIME_METHODS="['ccall','cwrap']" -o libmoo.js --pre-js moo.cb.js
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2019-07-14 16:34:16 +00:00
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#### moo.worker.js
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self.importScripts('libmoo.js');
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self.__ready = false;
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Module.onRuntimeInitialized = function()
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{
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self.__ready = true;
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console.log ('runtime is ready now...');
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}
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const libmoo = {
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open: Module.cwrap('moo_openstd', 'number', ['number', 'number', 'number']),
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close: Module.cwrap('moo_close', '', ['number'])
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};
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self.onmessage = function (evt) {
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var objData = evt.data;
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var cmd = objData.cmd;
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if (cmd === "test-moo")
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{
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//var x = Module.ccall('moo_openstd', [0, null, null]);
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//Module.ccall('moo_close', x);
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if (self.__ready)
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{
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var moo = libmoo.open(0, null, null);
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self.postMessage ('XXXXXXXXXXXXXXXx - ' + moo);
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libmoo.close (moo);
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}
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}
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}
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#### moo.html
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<!DOCTYPE html>
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<html>
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<head><meta charset="utf-8" /></head>
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<body>
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<input type="button" value="Test" onclick="do_test();" />
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<script type="text/javascript">
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2019-07-15 09:36:03 +00:00
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//var g_WebWorker = new Worker("moo.worker.js");
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var g_WebWorker = new SharedWorker("moo.worker.js");
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2019-07-14 16:34:16 +00:00
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//if (typeof(WebAssembly) === 'undefined')
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//{
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// alert ('No web assebly support in this browser');
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//}
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g_WebWorker.onerror = function (evt) { console.log(`Error from Web Worker: ${evt.message}`); }
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g_WebWorker.onmessage = function (evt) { console.log(`Message from the Web Worker:\n\n ${evt.data}`); }
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function do_test() {
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g_WebWorker.postMessage({ "cmd": "test-moo", "data": "nothing as of now.." });
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}
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</script>
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</body>
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</html>
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2019-07-15 09:36:03 +00:00
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