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Feature tags

Introduction

Godot has a special system to tag availability of features. Each feature is represented as a string, which can refer to many of the following:

• Platform name.

• Platform architecture (64-bit or 32-bit, x86 or ARM).

• Platform type (desktop, mobile, Web).

• Supported texture compression algorithms on the platform.

• Whether a build is debug or release (debug includes the editor).

• Whether the project is running from the editor or a “standalone” binary.

• Many more things.

Features can be queried at run-time from the singleton API by calling:

GDScriptC#

OS.has_feature(name)

OS.HasFeature(name);

OS feature tags are used by GDExtension to determine which libraries to load. For example, a library for linux.debug.editor.x86_64 will be loaded only on a debug editor build for Linux x86_64.

Default features

Here is a list of most feature tags in Godot. Keep in mind they are case-sensitive:

Warning

With the exception of texture compression and movie feature tags, default feature tags are immutable. This means that they will not change depending on run-time conditions. For example, OS.has_feature("mobile") will return false when running a project exported to HTML5 on a mobile device.

To check whether a project exported to HTML5 is running on a mobile device, call JavaScript code that reads the browser’s user agent.

Custom features

It is possible to add custom features to a build; use the relevant field in the export preset used to generate it:

Note

Custom feature tags are only used when running the exported project (including with One-click deploy). They are not used when running the project from the editor, even if the export preset marked as Runnable for your current platform has custom feature tags defined.

Overriding project settings

Features can be used to override specific configuration values in the Project Settings. This allows you to better customize any configuration when doing a build.

In the following example, a different icon is added for the demo build of the game (which was customized in a special export preset, which, in turn, includes only demo levels).

After overriding, a new field is added for this specific configuration:

Note

When using the project settings “override.cfg” functionality (which is unrelated to feature tags), remember that feature tags still apply. Therefore, make sure to also override the setting with the desired feature tag(s) if you want them to override base project settings on all platforms and configurations.

Default overrides

There are already a lot of settings that come with overrides by default; they can be found in many sections of the project settings.

Customizing the build

Feature tags can be used to customize a build process too, by writing a custom ExportPlugin. They are also used to specify which shared library is loaded and exported in GDExtension.