Add GDExtension library (#1878)

* Add gdextension package

* Update to 4.0 commit hash

* Fix arch and use option.get(jobs)

* Handle all architectures and add debug symbols

* 4 spaces indent

* Rename to godotcpp4

* Make use of architecture aliases

* Add correct defines and fix vs runtime

* Don't support arm64 on windows

* Use package-tools.scons

* 4 spaces indent and delete trailing whitespace

* Shorten test

* Update xmake.lua

---------

Co-authored-by: ruki <[email protected]>

packages/g/godotcpp4/xmake.lua

@@ -0,0 +1,97 @@
+package("godotcpp4")
+
+    set_homepage("https://godotengine.org/")
+    set_description("C++ bindings for the Godot 4 script API")
+
+    set_urls("https://github.com/godotengine/godot-cpp.git")
+    add_versions("4.0", "9d1c396c54fc3bdfcc7da4f3abcb52b14f6cce8f")
+
+    add_deps("scons")
+    add_includedirs("gen/include", "include")
+
+    on_load(function(package)
+        assert(not package:is_arch(
+                "mips",
+                "mip64",
+                "mips64",
+                "mipsel",
+                "mips64el",
+                "s390x",
+                "sh4"),
+                "architecture " .. package:arch() .. " is not supported")
+
+        if package:is_plat("windows") then
+            package:add("defines", "TYPED_METHOD_BIND", "NOMINMAX")
+        end
+        if package:is_debug() then
+            package:add("defines", "DEBUG_ENABLED", "DEBUG_METHODS_ENABLED")
+        end
+    end)
+
+    on_install("linux", "windows|x64", "windows|x86", "macosx", "iphoneos", "android", function(package)
+        if package:is_plat("windows") then
+            io.replace("tools/targets.py", "/MD", "/" .. package:config("vs_runtime"), {plain = true})
+        end
+
+        local platform = package:plat()
+        if package:is_plat("mingw") then
+            platform = "windows"
+        elseif package:is_plat("macosx") then
+            platform = "macos"
+        elseif package:is_plat("iphoneos") then
+            platform = "ios"
+        end
+
+        local arch = package:arch()
+        if package:is_arch("x86", "i386") then
+            arch = "x86_32"
+        elseif package:is_arch("arm64-v8a") then
+            arch = "arm64"
+        elseif package:is_arch("arm", "armeabi", "armeabi-v7a", "armv7s", "armv7k") then
+            arch = "arm32"
+        end
+
+        local configs = {
+            "target=" .. (package:is_debug() and "template_debug" or "template_release"),
+            "platform=" .. platform,
+            "arch=" .. arch,
+            "debug_symbols=" .. (package:is_debug() and "yes" or "no")
+        }
+
+        import("package.tools.scons").build(package, configs)
+        os.cp("bin/*." .. (package:is_plat("windows") and "lib" or "a"), package:installdir("lib"))
+        os.cp("include/godot_cpp", package:installdir("include"))
+        os.cp("gen/include/godot_cpp", path.join(package:installdir("gen"), "include", "godot_cpp"))
+        os.cp("gdextension/gdextension_interface.h", package:installdir("include"))
+    end)
+
+    on_test(function (package)
+        assert(package:check_cxxsnippets({test = [[
+          #include <godot_cpp/classes/global_constants.hpp>
+          #include <godot_cpp/classes/ref_counted.hpp>
+          #include <godot_cpp/core/binder_common.hpp>
+          using namespace godot;
+
+          class ExampleRef : public RefCounted {
+            GDCLASS(ExampleRef, RefCounted);
+
+          protected:
+            static void _bind_methods() {
+              ClassDB::bind_method(D_METHOD("get_id"), &ExampleRef::get_id);
+            }
+
+          public:
+            int get_id() { return 5; }
+          };
+
+          extern "C" {
+          GDExtensionBool GDE_EXPORT
+          example_library_init(const GDExtensionInterface *p_interface,
+                              GDExtensionClassLibraryPtr p_library,
+                              GDExtensionInitialization *r_initialization) {
+            ClassDB::register_class<ExampleRef>();
+            return true;
+          }
+          }
+        ]]}, {configs = {languages = "cxx17"}}))
+    end)