updated readme. added Build section

addons/debug_draw_3d/README.md

@@ -132,6 +132,10 @@ Most likely, when exporting a release version of a game, you don't want to expor
 
 ![export_features](/images/export_features.png)
 
+In C#, these tags are not taken into account at the moment. So you will have to manually specify `FORCED_DD3D`.
+
+![csharp_compilation_symbols](/images/csharp_compilation_symbols.png)
+
 ## Known issues and limitations
 
 Enabling occlusion culing can lower fps instead of increasing it. At the moment I do not know how to speed up the calculation of the visibility of objects.
@@ -151,3 +155,29 @@ The entire text overlay can only be placed in one corner, unlike `DataGraphs`.
 
 `DebugDrawDemoScene.tscn` in play mode
 ![screenshot_3](/images/screenshot_3.png)
+
+## Build
+
+As well as for the engine itself, you will need to configure the [environment](https://docs.godotengine.org/en/4.1/contributing/development/compiling/index.html).
+And also you need to apply several patches:
+
+```bash
+cd godot-cpp
+git apply --ignore-space-change --ignore-whitespace ../patches/always_build_fix.patch
+git apply --ignore-space-change --ignore-whitespace ../patches/1165.patch
+# Optional
+## Build only the necessary classes
+git apply --ignore-space-change --ignore-whitespace ../patches/godot_cpp_exclude_unused_classes.patch
+## Faster build
+git apply --ignore-space-change --ignore-whitespace ../patches/unity_build.patch
+```
+
+Then you can just run scons as usual:
+
+```bash
+# build for the current system.
+# target=editor is used for both the editor and the debug template.
+scons target=editor dev_build=yes debug_symbols=yes
+# build for the android. ANDROID_NDK_ROOT is required in your environment variables.
+scons platform=android target=template_release arch=arm64v8
+```

src/editor/generate_csharp_bindings.cpp

@@ -352,7 +352,6 @@ void GenerateCSharpBindingsPlugin::generate_enum(const StringName &cls, const St
 	log(enm, 3);
 
 	int added_items = 0;
-	// TODO flags?
 	line(FMT_STR("public enum {0} : long", enm));
 	{
 		TAB();
@@ -859,4 +858,7 @@ GenerateCSharpBindingsPlugin::IfDefGuard GenerateCSharpBindingsPlugin::ifdef(con
 
 #undef TAB
 #undef IFDEF
+#undef DD3D_ENABLED_STR
+#undef IFDEF_DD3D_ENABLED
+#undef IFELSE
 #endif