godot-cpp init.

.gitmodules

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+[submodule "game-of-life-test/thirdparty/godot-cpp"]
+	path = game-of-life-test/thirdparty/godot-cpp
+	url = https://github.com/godotengine/godot-cpp.git
+	branch = 4.5

game-of-life-test/thirdparty/.gitignore

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+bin
+*.uid
+*sconsign.dblite
+**.os
+
+game-of-life-test/thirdparty/godot-cpp/bin/
+game-of-life-test/thirdparty/bin/
+*.o
+*.so
+

game-of-life-test/thirdparty/SConstruct

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+import os
+from SCons.Script import DefaultEnvironment, ARGUMENTS, Glob, Dir
+
+env = DefaultEnvironment()
+platform = ARGUMENTS.get("platform", "linux")
+target = ARGUMENTS.get("target", "template_debug")  # or template_release
+arch = ARGUMENTS.get("arch", "x86_64")
+
+HERE = Dir(".").abspath
+GODOTCPP = os.path.join(HERE, "godot-cpp")
+
+inc_paths = [
+    os.path.join(GODOTCPP, "include"),
+    os.path.join(GODOTCPP, "gen", "include"),
+]
+for extra in ("godot-headers", "gdextension"):
+    p = os.path.join(GODOTCPP, extra)
+    if os.path.isdir(p):
+        inc_paths.append(p)
+
+env.Append(CPPPATH=inc_paths)
+env.Append(LIBPATH=[os.path.join(GODOTCPP, "bin")])
+env.Append(CXXFLAGS=["-std=c++17", "-fPIC"])
+
+env.Append(LIBS=[f"godot-cpp.{platform}.{target}.{arch}"])
+
+outdir = os.path.join(HERE, "bin")
+os.makedirs(outdir, exist_ok=True)
+soname = f"gol.{platform}.{'debug' if target == 'template_debug' else 'release'}.{arch}"
+
+env.SharedLibrary(target=os.path.join(outdir, soname), source=Glob("src/*.cpp"))

game-of-life-test/thirdparty/godot-cpp

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+Subproject commit abe94570a16e38eec442d1c9acc0c518c479e725

game-of-life-test/thirdparty/gol.gdextension

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+
+[configuration]
+entry_symbol = "gol_library_init"
+compatibility_minimum = "4.5"   ; required in 4.5+
+reloadable = true
+
+[libraries]
+linux.debug.x86_64   = "res://thirdparty/bin/libgol.linux.debug.x86_64"
+

game-of-life-test/thirdparty/src/gol.cpp

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+
+// src/gol.cpp
+
+#include <gdextension_interface.h>
+#include <godot_cpp/classes/ref_counted.hpp>
+#include <godot_cpp/core/class_db.hpp>
+#include <godot_cpp/core/defs.hpp>
+#include <godot_cpp/godot.hpp>
+#include <godot_cpp/variant/array.hpp>
+
+using namespace godot;
+
+class GoL : public RefCounted {
+  GDCLASS(GoL, RefCounted);
+
+  static void _bind_methods() {
+    ClassDB::bind_method(D_METHOD("step_once", "arr", "n"), &GoL::step_once);
+  }
+
+  static int neighs(const Array &a, int n, int x, int y) {
+    int s = 0;
+    for (int dy = -1; dy <= 1; ++dy) {
+      for (int dx = -1; dx <= 1; ++dx) {
+        if (dx == 0 && dy == 0)
+          continue;
+        const int nx = ((x + dx) % n + n) % n;
+        const int ny = ((y + dy) % n + n) % n;
+        const Array row = a[ny];
+        s += (int)row[nx];
+      }
+    }
+    return s;
+  }
+
+public:
+  Array step_once(const Array &arr, int n) const {
+    Array next;
+    next.resize(n);
+    for (int y = 0; y < n; ++y) {
+      Array row;
+      row.resize(n);
+      const Array crow = arr[y];
+      for (int x = 0; x < n; ++x) {
+        const bool alive = ((int)crow[x]) == 1;
+        const int cn = neighs(arr, n, x, y);
+        row.set(x, alive ? int(cn == 2 || cn == 3) : int(cn == 3));
+      }
+      next.set(y, row);
+    }
+    return next;
+  }
+};
+
+extern "C" GDExtensionBool GDE_EXPORT
+gol_library_init(GDExtensionInterfaceGetProcAddress get_proc_address,
+                 GDExtensionClassLibraryPtr library,
+                 GDExtensionInitialization *r_initialization) {
+
+  static GDExtensionBinding::InitObject init(get_proc_address, library,
+                                             r_initialization);
+
+  init.register_initializer([](ModuleInitializationLevel p_level) {
+    if (p_level != MODULE_INITIALIZATION_LEVEL_SCENE)
+      return;
+    ClassDB::register_class<GoL>();
+  });
+
+  init.register_terminator([](ModuleInitializationLevel /*p_level*/) {
+    // no-op
+  });
+
+  init.set_minimum_library_initialization_level(
+      MODULE_INITIALIZATION_LEVEL_SCENE);
+  return init.init();
+}