Makes the OpenXR API available for GDExtension. [OpenXRAPIExtension] makes OpenXR available for GDExtension. It provides the OpenXR API to GDExtension through the [method get_instance_proc_addr] method, and the OpenXR instance through [method get_instance]. It also provides methods for querying the status of OpenXR initialization, and helper methods for ease of use of the API with GDExtension. https://registry.khronos.org/OpenXR/specs/1.0/man/html/XrResult.html https://registry.khronos.org/OpenXR/specs/1.0/man/html/XrInstance.html https://registry.khronos.org/OpenXR/specs/1.0/man/html/XrSpace.html https://registry.khronos.org/OpenXR/specs/1.0/man/html/XrSession.html https://registry.khronos.org/OpenXR/specs/1.0/man/html/XrSystemId.html https://registry.khronos.org/OpenXR/specs/1.0/man/html/xrBeginSession.html https://registry.khronos.org/OpenXR/specs/1.0/man/html/XrPosef.html Returns [code]true[/code] if OpenXR is initialized for rendering with an XR viewport. Returns an error string for the given [url=https://registry.khronos.org/OpenXR/specs/1.0/man/html/XrResult.html]XrResult[/url]. Returns the corresponding [code]XRHandTrackerEXT[/code] handle for the given hand index value. Returns the [url=https://registry.khronos.org/OpenXR/specs/1.0/man/html/XrInstance.html]XrInstance[/url] created during the initialization of the OpenXR API. Returns the function pointer of the OpenXR function with the specified name, cast to an integer. If the function with the given name does not exist, the method returns [code]0[/code]. [b]Note:[/b] [code]openxr/util.h[/code] contains utility macros for acquiring OpenXR functions, e.g. [code]GDEXTENSION_INIT_XR_FUNC_V(xrCreateAction)[/code]. Returns the predicted display timing for the next frame. Returns the play space, which is an [url=https://registry.khronos.org/OpenXR/specs/1.0/man/html/XrSpace.html]XrSpace[/url] cast to an integer. Returns the predicted display timing for the current frame. Returns the OpenXR session, which is an [url=https://registry.khronos.org/OpenXR/specs/1.0/man/html/XrSession.html]XrSession[/url] cast to an integer. Returns the name of the specified swapchain format. Returns the id of the system, which is a [url=https://registry.khronos.org/OpenXR/specs/1.0/man/html/XrSystemId.html]XrSystemId[/url] cast to an integer. Returns [enum OpenXRAPIExtension.OpenXRAlphaBlendModeSupport] denoting if [constant XRInterface.XR_ENV_BLEND_MODE_ALPHA_BLEND] is really supported, emulated or not supported at all. Returns [code]true[/code] if OpenXR is initialized. Returns [code]true[/code] if OpenXR is running ([url=https://registry.khronos.org/OpenXR/specs/1.0/man/html/xrBeginSession.html]xrBeginSession[/url] was successfully called and the swapchains were created). Returns [code]true[/code] if OpenXR is enabled. Registers the given extension as a composition layer provider. If set to [code]true[/code], an OpenXR extension is loaded which is capable of emulating the [constant XRInterface.XR_ENV_BLEND_MODE_ALPHA_BLEND] blend mode. Creates a [Transform3D] from an [url=https://registry.khronos.org/OpenXR/specs/1.0/man/html/XrPosef.html]XrPosef[/url]. Unregisters the given extension as a composition layer provider. Returns [code]true[/code] if the provided [url=https://registry.khronos.org/OpenXR/specs/1.0/man/html/XrResult.html]XrResult[/url] (cast to an integer) is successful. Otherwise returns [code]false[/code] and prints the [url=https://registry.khronos.org/OpenXR/specs/1.0/man/html/XrResult.html]XrResult[/url] converted to a string, with the specified additional information. Means that [constant XRInterface.XR_ENV_BLEND_MODE_ALPHA_BLEND] isn't supported at all. Means that [constant XRInterface.XR_ENV_BLEND_MODE_ALPHA_BLEND] is really supported. Means that [constant XRInterface.XR_ENV_BLEND_MODE_ALPHA_BLEND] is emulated.