intiial commit

notnullgames · Jul 8, 2024 · d3f99eb · d3f99eb
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diff --git a/.gitignore b/.gitignore
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+.DS_Store
+build
diff --git a/CMakeLists.txt b/CMakeLists.txt
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+cmake_minimum_required(VERSION 3.18)
+
+project(wasm_shared
+  DESCRIPTION "null0 engine experiment: shared memory"
+  HOMEPAGE_URL "https://github.com/notnullgames/wasm-shared"
+  VERSION 0.0.1
+  LANGUAGES C
+)
+
+if(NOT EMSCRIPTEN)
+  message(FATAL_ERROR "You must compile with emscripten.")
+endif()
+
+set(CMAKE_EXECUTABLE_SUFFIX ".mjs")
+
+add_executable(${PROJECT_NAME}-host host.c)
+target_link_options(${PROJECT_NAME}-host PRIVATE -sINITIAL_MEMORY=512MB -sEXPORTED_FUNCTIONS=@${CMAKE_CURRENT_SOURCE_DIR}/host.txt -sEXPORTED_RUNTIME_METHODS=wasmMemory)
+
+# normally I would do this without emscripten, but this makes it a bit easier
+add_executable(${PROJECT_NAME}-cart cart.c)
+target_link_options(${PROJECT_NAME}-cart PRIVATE -sWARN_ON_UNDEFINED_SYMBOLS=0 -sTOTAL_MEMORY=512MB --no-entry -sMODULARIZE -sEXPORTED_FUNCTIONS=@${CMAKE_CURRENT_SOURCE_DIR}/cart.txt -Wl,--import-memory -sSTANDALONE_WASM)
+
diff --git a/README.md b/README.md
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+This is an experiment with sharing memory between 2 wasms, to work out ideas for null0.
+
+This should allow passing pointers back & forth between host & cart.
+
+## build
+
+```
+emcmake cmake -B build -GNinja
+cmake --build build
+```
+
+## host
+
+This is a web-based host, compiled with emscripten. It has it's memory exported.
+
+
+## cart
+
+This is user-code, and must import it's memory (which comes from host.)
+
diff --git a/cart.c b/cart.c
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+// this will be imported from host
+void logtest(char* message);
+
+void test() {
+  logtest("I am inside the cart!");
+}
diff --git a/cart.txt b/cart.txt
@@ -0,0 +1 @@
+_test
diff --git a/host.c b/host.c
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+#include "stdio.h"
+
+void logtest(char* message) {
+  printf("%s\n", message);
+}
+
+int main(int argc, char* argv[]) {
+  return 0;
+}
diff --git a/host.txt b/host.txt
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+_logtest
+_main
diff --git a/test.htm b/test.htm
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+<head>
+  <title>Shared Mem Wasm Test</title>
+</head>
+
+<body>
+  Check console.
+</body>
+
+<script type="module">
+// here I use the js for teh host, and the bare wasm for cart
+
+// load emscripten host
+import loadHost from './build/wasm_shared-host.mjs'
+const host = await loadHost()
+
+// cart is a "plain wasm", so set it up with regular browser stuff
+const cart = (await WebAssembly.instantiateStreaming(fetch("./build/wasm_shared-cart.wasm"), {
+  env: {
+    memory: host.wasmMemory,
+    logtest: host._logtest
+  }
+})).instance.exports
+
+// call cart's test, which will call host's logtest
+
+cart.test()
+
+</script>