Proposal for unbounded space and spatial anchor extensions.
This commit is contained in:
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@ -232,6 +232,7 @@ maintained in the master branch of the Khronos OpenXR GitHub project.
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<type category="handle" parent="XrSession"><type>XR_DEFINE_HANDLE</type>(<name>XrSwapchain</name>)</type>
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<type category="handle" parent="XrSession"><type>XR_DEFINE_HANDLE</type>(<name>XrSpace</name>)</type>
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<type category="handle" parent="XrInstance"><type>XR_DEFINE_HANDLE</type>(<name>XrDebugUtilsMessengerEXT</name>)</type>
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<type category="handle" parent="XrSession"><type>XR_DEFINE_HANDLE</type>(<name>XrSpatialAnchorMSFT</name>)</type>
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<!-- enums and flag bits generated from corresponding <enums> tags below -->
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<type name="XrStructureType" category="enum"/>
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@ -966,6 +967,22 @@ maintained in the master branch of the Khronos OpenXR GitHub project.
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const <type>XrDebugUtilsMessengerCallbackDataEXT</type>* callbackData,
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<type>void</type>* userData);
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</type>
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<!-- types for XR_MSFT_spatial_anchor -->
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<type category="struct" name="XrSpatialAnchorCreateInfoMSFT">
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<member values="XR_TYPE_SPATIAL_ANCHOR_CREATE_INFO_MSFT"><type>XrStructureType</type><name>type</name></member>
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<member>const <type>void</type>* <name>next</name></member>
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<member><type>XrSpace</type><name>space</name></member>
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<member><type>XrPosef</type><name>pose</name></member>
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<member><type>XrTime</type><name>time</name></member>
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</type>
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<type category="struct" name="XrSpatialAnchorSpaceCreateInfoMSFT">
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<member values="XR_TYPE_ACTION_SPACE_CREATE_INFO"><type>XrStructureType</type> <name>type</name></member>
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<member>const <type>void</type>* <name>next</name></member>
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<member><type>XrSpatialAnchorMSFT</type> <name>anchor</name></member>
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<member><type>XrPosef</type> <name>poseInAnchorSpace</name></member>
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</type>
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</types>
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<!-- SECTION: OpenXR enumerant (token) definitions. -->
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@ -1764,6 +1781,25 @@ maintained in the master branch of the Khronos OpenXR GitHub project.
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<param><type>XrVisibilityMaskTypeKHR</type> <name>visibilityMaskType</name></param>
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<param><type>XrVisibilityMaskKHR</type>* <name>visibilityMask</name></param>
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</command>
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<!-- commands for XR_MSFT_spatial_anchor -->
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<command successcodes="XR_SUCCESS" errorcodes="XR_ERROR_INSTANCE_LOST,XR_ERROR_OUT_OF_MEMORY,XR_ERROR_FUNCTION_UNSUPPORTED,XR_ERROR_VALIDATION_FAILURE,XR_ERROR_HANDLE_INVALID,XR_ERROR_POSE_INVALID,XR_ERROR_CREATE_SPATIAL_ANCHOR_FAILED_MSFT,XR_ERROR_TIME_INVALID,XR_ERROR_SESSION_LOST,XR_SESSION_LOSS_PENDING">
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<proto><type>XrResult</type> <name>xrCreateSpatialAnchorMSFT</name></proto>
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<param><type>XrSession</type> <name>session</name></param>
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<param>const <type>XrSpatialAnchorCreateInfoMSFT</type>* <name>createInfo</name></param>
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<param><type>XrSpatialAnchorMSFT</type>* <name>anchor</name></param>
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</command>
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<command successcodes="XR_SUCCESS" errorcodes="XR_ERROR_INSTANCE_LOST,XR_ERROR_OUT_OF_MEMORY,XR_ERROR_FUNCTION_UNSUPPORTED,XR_ERROR_VALIDATION_FAILURE,XR_ERROR_HANDLE_INVALID,XR_ERROR_POSE_INVALID,XR_ERROR_SESSION_LOST,XR_SESSION_LOSS_PENDING">
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<proto><type>XrResult</type> <name>xrCreateSpatialAnchorSpaceMSFT</name></proto>
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<param><type>XrSession</type> <name>session</name></param>
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<param>const <type>XrSpatialAnchorSpaceCreateInfoMSFT</type>* <name>createInfo</name></param>
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<param><type>XrSpace</type>* <name>space</name></param>
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</command>
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<command successcodes="XR_SUCCESS" errorcodes="XR_ERROR_HANDLE_INVALID,XR_ERROR_FUNCTION_UNSUPPORTED">
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<proto><type>XrResult</type> <name>xrDestroySpatialAnchorMSFT</name></proto>
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<param><type>XrSpatialAnchorMSFT</type> <name>anchor</name></param>
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</command>
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</commands>
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<!-- SECTION: OpenXR API interface definitions -->
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@ -2263,17 +2299,27 @@ maintained in the master branch of the Khronos OpenXR GitHub project.
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</require>
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</extension>
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<extension name="XR_MSFT_unbounded_reference_space" number="39" type="instance" supported="disabled">
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<extension name="XR_MSFT_unbounded_reference_space" number="39" type="instance" supported="openxr">
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<require>
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<enum value="1" name="XR_MSFT_unbounded_reference_space_SPEC_VERSION"/>
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<enum value=""XR_MSFT_unbounded_reference_space"" name="XR_MSFT_UNBOUNDED_REFERENCE_SPACE_EXTENSION_NAME"/>
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<enum offset="0" extends="XrReferenceSpaceType" name="XR_REFERENCE_SPACE_TYPE_UNBOUNDED_MSFT"/>
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</require>
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</extension>
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<extension name="XR_MSFT_spatial_anchor" number="40" type="instance" supported="disabled">
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<extension name="XR_MSFT_spatial_anchor" number="40" type="instance" supported="openxr">
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<require>
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<enum value="1" name="XR_MSFT_spatial_anchor_SPEC_VERSION"/>
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<enum value=""XR_MSFT_spatial_anchor"" name="XR_MSFT_SPATIAL_ANCHOR_EXTENSION_NAME"/>
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<enum offset="0" extends="XrStructureType" name="XR_TYPE_SPATIAL_ANCHOR_CREATE_INFO_MSFT"/>
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<enum offset="1" extends="XrStructureType" name="XR_TYPE_SPATIAL_ANCHOR_SPACE_CREATE_INFO_MSFT"/>
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<command name="xrCreateSpatialAnchorMSFT" />
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<command name="xrCreateSpatialAnchorSpaceMSFT" />
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<command name="xrDestroySpatialAnchorMSFT" />
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<enum offset="0" extends="XrObjectType" name="XR_OBJECT_TYPE_SPATIAL_ANCHOR_MSFT" comment="XrSpatialAnchorMSFT" />
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<enum offset="1" dir="-" extends="XrResult" name="XR_ERROR_CREATE_SPATIAL_ANCHOR_FAILED_MSFT" comment="Spatial anchor could not be created at that location.">
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</require>
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</extension>
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@ -2,22 +2,179 @@ include::../meta/XR_MSFT_spatial_anchor.adoc[]
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*Overview*
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This extension supports creation of spatial anchor for application to render world locked hologram in world scale tracked system.
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[open,refpage='XrSpatialAnchorMSFT',type='handles',desc='Represents a spatial anchor']
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--
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This extension allows an application to create a **spatial anchor**,
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an arbitrary freespace point in the user's physical environment that will then
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be tracked by the runtime.
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The runtime should: then adjust the position and orientation of that anchor's origin
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over time as needed, independently of all other spaces and anchors, to ensure that it
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maintains its original mapping to the real world.
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include::../../../../generated/api/handles/XrSpatialAnchorMSFT.txt[]
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Spatial anchors are often used in combination with an `UNBOUNDED_MSFT` reference space.
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`UNBOUNDED_MSFT` reference spaces adjust their origin as necessary
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to keep the viewer's coordinates relative to the space's origin stable.
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Such adjustments maintain the visual stability of content currently near the viewer,
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but may cause content placed far from the viewer to drift in its alignment to the real world
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by the time the user moves close again.
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By creating an `XrSpatialAnchorMSFT` where a piece of content is placed and then always
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rendering that content relative to its anchor's space,
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an application can ensure that each piece of content stays at a fixed location in the environment.
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--
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[open,refpage='xrCreateSpatialAnchorMSFT',desc='Creates a spatial anchor',type='protos',xrefs='XrSpatialAnchorMSFT XrSpatialAnchorCreateInfoMSFT']
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--
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The flink:xrCreateSpatialAnchorMSFT function is defined as:
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include::../../../../generated/api/protos/xrCreateSpatialAnchorMSFT.txt[]
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.Parameter Descriptions
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****
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* pname:session is a handle to an slink:XrSession.
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* pname:createInfo is a pointer to an slink:XrSpatialAnchorCreateInfoMSFT structure
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containing information about how to create the anchor.
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* pname:session is a pointer to a handle in which the created
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slink:XrSpatialAnchorMSFT is returned.
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****
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Creates an slink:XrSpatialAnchorMSFT handle representing a spatial anchor
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that will track a fixed location in the physical world over time.
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That real-world location is specified by the position and orientation of
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the specified pname:pose within pname:space at pname:time.
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If pname:space cannot be located relative to the environment at the moment
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of the call to flink:xrCreateSpatialAnchorMSFT, the runtime must: return ename:XR_ERROR_CREATE_SPATIAL_ANCHOR_FAILED_MSFT.
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After the anchor is created, the runtime should: then adjust its position
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and orientation over time relative to other spaces so as to maintain maximum alignment
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to its original real-world location, even if that changes the anchor's
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relationship to the original pname:space used to initialize it.
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include::../../../../generated/validity/protos/xrCreateSpatialAnchorMSFT.txt[]
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--
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[open,refpage='XrSpatialAnchorCreateInfoMSFT',desc='Information to create a spatial anchor',type='structs',xrefs='XrSpatialAnchorMSFT xrCreateSpatialAnchorMSFT']
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--
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The slink:XrSpatialAnchorCreateInfoMSFT structure is defined as:
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include::../../../../generated/api/structs/XrSpatialAnchorCreateInfoMSFT.txt[]
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.Member Descriptions
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****
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* pname:type is the elink:XrStructureType of this structure.
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* pname:next is code:NULL or a pointer to an extension-specific structure.
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* pname:space is a handle to the slink:XrSpace in which pname:pose is specified.
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* pname:pose is the slink:XrPosef within pname:space at pname:time that
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specifies the point in the real world used to initialize the new anchor.
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* pname:time is the basetype:XrTime at which pname:pose will be evaluated
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within pname:space.
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****
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include::../../../../generated/validity/structs/XrSpatialAnchorCreateInfoMSFT.txt[]
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--
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[open,refpage='xrCreateSpatialAnchorSpaceMSFT',desc='Creates a space from a spatial anchor',type='protos',xrefs='XrSpatialAnchorMSFT XrSpatialAnchorSpaceCreateInfoMSFT XrSpace']
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--
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The flink:xrCreateSpatialAnchorSpaceMSFT function is defined as:
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include::../../../../generated/api/protos/xrCreateSpatialAnchorSpaceMSFT.txt[]
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.Parameter Descriptions
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****
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* pname:session is a handle to an slink:XrSession.
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* pname:createInfo is a pointer to an slink:XrSpatialAnchorSpaceCreateInfoMSFT structure
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containing information about how to create the anchor.
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* pname:space is a pointer to a handle in which the created
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slink:XrSpace is returned.
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****
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Creates an slink:XrSpace handle based on a spatial anchor.
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Application can: provide an slink:XrPosef to define the position and
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orientation of the new space's origin relative to the anchor's natural origin.
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Multiple slink:XrSpace handles may exist for a given slink:XrSpatialAnchorMSFT simultaneously,
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up to some limit imposed by the runtime.
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The slink:XrSpace handle must be eventually freed via the
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flink:xrDestroySpace function or by destroying the parent slink:XrSpatialAnchorMSFT
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handle.
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include::../../../../generated/validity/protos/xrCreateSpatialAnchorSpaceMSFT.txt[]
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--
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[open,refpage='XrSpatialAnchorSpaceCreateInfoMSFT',desc='Information to create a space from a spatial anchor',type='structs',xrefs='XrSpatialAnchorMSFT xrCreateSpatialAnchorSpaceMSFT XrSpace']
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--
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The slink:XrSpatialAnchorSpaceCreateInfoMSFT structure is defined as:
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include::../../../../generated/api/structs/XrSpatialAnchorSpaceCreateInfoMSFT.txt[]
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.Member Descriptions
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****
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* pname:type is the elink:XrStructureType of this structure.
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* pname:next is code:NULL or a pointer to an extension-specific structure.
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* pname:anchor is a handle to an slink:XrSpatialAnchorMSFT previously created with
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flink:xrCreateSpatialAnchorMSFT.
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* pname:poseInAnchorSpace is an slink:XrPosef defining the position and
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orientation of the new space's origin relative to the anchor's natural origin.
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****
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include::../../../../generated/validity/structs/XrSpatialAnchorSpaceCreateInfoMSFT.txt[]
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--
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[open,refpage='xrDestroySpatialAnchorMSFT',desc='Destroys a spatial anchor',type='protos',xrefs='XrSpatialAnchorMSFT xrCreateSpatialAnchorMSFT']
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--
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The flink:xrDestroySpatialAnchorMSFT function is defined as:
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include::../../../../generated/api/protos/xrDestroySpatialAnchorMSFT.txt[]
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.Parameter Descriptions
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****
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* pname:anchor is a handle to an slink:XrSpatialAnchorMSFT previously created by
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flink:xrCreateSpatialAnchorMSFT.
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****
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slink:XrSpatialAnchorMSFT handles are destroyed using flink:xrDestroySpatialAnchorMSFT.
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By destroying an anchor, the runtime can: stop spending resources used to maintain tracking
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for that anchor's origin.
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include::../../../../generated/validity/protos/xrDestroySpatialAnchorMSFT.txt[]
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--
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*New Object Types*
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slink:XrSpatialAnchorMSFT
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*New Flag Types*
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*New Enum Constants*
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ename:XR_OBJECT_TYPE_SPATIAL_ANCHOR_MSFT
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ename:XR_TYPE_SPATIAL_ANCHOR_CREATE_INFO_MSFT
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ename:XR_ERROR_CREATE_SPATIAL_ANCHOR_FAILED_MSFT
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*New Enums*
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*New Structures*
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slink:XrSpatialAnchorCreateInfoMSFT
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slink:XrSpatialAnchorSpaceCreateInfoMSFT
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*New Functions*
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flink:xrCreateSpatialAnchorMSFT
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flink:xrCreateSpatialAnchorSpaceMSFT
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flink:xrDestroySpatialAnchorMSFT
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*Issues*
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*Version History*
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* Revision 1, TODO: https://gitlab.khronos.org/openxr/openxr/merge_requests/1258
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* Revision 1, 2019-07-30 (Alex Turner)
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** Initial extension description
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@ -2,14 +2,75 @@ include::../meta/XR_MSFT_unbounded_reference_space.adoc[]
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*Overview*
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This extension allows application to create an unbounded reference space, also known as UNBOUNDED reference space in WebXR.
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This extension allows an application to create an `UNBOUNDED_MSFT` reference space.
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This reference space enables the viewer to move freely through a complex environment,
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often many meters from where they started, while always optimizing
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for coordinate system stability near the viewer.
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This is done by allowing the origin of the reference space to drift as necessary
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to keep the viewer's coordinates relative to the space's origin stable.
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To create an `UNBOUNDED_MSFT` reference space, the application can:
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pass ename:XR_REFERENCE_SPACE_TYPE_UNBOUNDED_MSFT to flink:xrCreateReferenceSpace.
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The `UNBOUNDED_MSFT` reference space establishes a world-locked origin,
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gravity-aligned to exclude pitch and roll, with +Y up, +X to the right,
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and -Z forward.
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This space begins with an arbitrary initial position and orientation, which the
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runtime may: define to be either the initial position at app launch or
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some other initial zero position.
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Unlike a `STAGE` reference space, the runtime may: place the origin of an `UNBOUNDED_MSFT`
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reference space at any height, rather than fixing it at the floor.
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This is because the viewer may move through various rooms and levels of their
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environment, each of which has a different floor height.
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Runtimes should: not automatically adjust the position of the origin when
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the viewer moves to a room with a different floor height.
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`UNBOUNDED_MSFT` space is useful when an app needs to render *world-scale* content
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that spans beyond the bounds of a single `STAGE`,
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for example, an entire floor or multiple floors of a building.
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An `UNBOUNDED_MSFT` space maintains stability near the viewer by slightly adjusting
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its origin over time. The runtime must: not queue the
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slink:XrEventDataReferenceSpaceChangePending event in response to these
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minor adjustments.
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When views, controllers or other spaces experience tracking loss relative to
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the `UNBOUNDED_MSFT` space, runtimes should: continue to provide inferred or
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last-known pname:position and pname:orientation values.
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These inferred poses can, for example, be based on neck model updates,
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inertial dead reckoning, or a last-known position, so long as it is still
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reasonable for the application to use that pose.
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While a runtime is providing position data, it must: continue to set
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ename:XR_SPACE_LOCATION_POSITION_VALID_BIT and
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ename:XR_VIEW_STATE_POSITION_VALID_BIT but it can: clear
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ename:XR_SPACE_LOCATION_POSITION_TRACKED_BIT and
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ename:XR_VIEW_STATE_POSITION_TRACKED_BIT to indicate that the position is
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inferred or last-known in this way.
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When tracking is recovered, runtimes should: snap the pose of other spaces
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back into position relative to the `UNBOUNDED_MSFT` space's original origin.
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However, if tracking recovers into a new tracking volume in which the
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original origin can no longer be located (e.g. the viewer moved through
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a dark hallway and regained tracking in a new room), the runtime may: recenter
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the origin arbitrarily, for example moving the origin to coincide with the viewer.
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If such recentering occurs, the runtime must: queue the
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slink:XrEventDataReferenceSpaceChangePending event with pname:poseValid set to false.
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If the viewer moves far enough away from the origin of an `UNBOUNDED_MSFT` reference space
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that floating point error would introduce noticeable error when locating the viewer
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within that space, the runtime may: recenter the space's origin to a new location
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closer to the viewer. If such recentering occurs, the runtime must: queue the
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slink:XrEventDataReferenceSpaceChangePending event with pname:poseValid set to true.
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Runtimes must: support the `UNBOUNDED_MSFT` reference space when this extension is enabled.
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*New Object Types*
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*New Flag Types*
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*New Enum Constants*
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ename:XR_REFERENCE_SPACE_TYPE_UNBOUNDED_MSFT
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*New Enums*
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*New Structures*
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@ -20,4 +81,5 @@ This extension allows application to create an unbounded reference space, also k
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*Version History*
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* Revision 1, TODO: https://gitlab.khronos.org/openxr/openxr/merge_requests/1258
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* Revision 1, 2019-07-30 (Alex Turner)
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** Initial extension description
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