Abstract: A technique includes determining a depth value for each of a plurality of pixels of a frame, down-sampling the depth values of a tile of the frame to obtain a plurality of down-sampled depth values, the frame including one or more tiles, determining a change in a head pose, determining, from the plurality of down-sampled depth values, a down-sampled depth value for a vertex, determining an adjusted position for the vertex based on the change in head pose and the down-sampled depth value for the vertex, performing, based on at least the adjusted position for the vertex, a depth-adjusted time-warping of the frame to obtain a depth-adjusted time-warped frame, and triggering display of the depth-adjusted time-warped frame.

Abstract: A technique includes determining a depth value for each of a plurality of pixels of a frame, down-sampling the depth values of a tile of the frame to obtain a plurality of down-sampled depth values, the frame including one or more tiles, determining a change in a head pose, determining, from the plurality of down-sampled depth values, a down-sampled depth value for a vertex, determining an adjusted position for the vertex based on the change in head pose and the down-sampled depth value for the vertex, performing, based on at least the adjusted position for the vertex, a depth-adjusted time-warping of the frame to obtain a depth-adjusted time-warped frame, and triggering display of the depth-adjusted time-warped frame.

Abstract: An example technique may include performing a first time-warping of a scene of virtual reality content based on head pose information received during or after a rendering of the scene to obtain a time-warped scene, performing a second time-warping of an object based at least on object pose information received during or after a rendering of the object to obtain a time-warped object, and displaying on a display device a composite image based on the time-warped scene and the time-warped object.

Abstract: A technique includes determining a depth value for each of a plurality of pixels of a frame, down-sampling the depth values of a tile of the frame to obtain a plurality of down-sampled depth values, the frame including one or more tiles, determining a change in a head pose, determining, from the plurality of down-sampled depth values, a down-sampled depth value for a vertex, determining an adjusted position for the vertex based on the change in head pose and the down-sampled depth value for the vertex, performing, based on at least the adjusted position for the vertex, a depth-adjusted time-warping of the frame to obtain a depth-adjusted time-warped frame, and triggering display of the depth-adjusted time-warped frame.

Abstract: Display pre-distortion methods and apparatus for HMDs are disclosed. A disclosed example method includes determining a position of a pupil relative to a lens of the head-mounted display (HMD), determining, based on the determined position, a pre-distortion map for an image to be displayed on a display screen of the HMD, and displaying the image on the display screen of the HMD, wherein the image is modified by the pre-distortion map.

Abstract: An application executed at a central processing unit (CPU) of a head mounted display (HMD) system generates sets of frame drawing commands for a graphics processing unit (GPU), and for each set of frame drawing commands the GPU renders a corresponding frame into one of a plurality of frame buffers. Each frame is generated to include or be associated with a frame number that indicates the location of the frame in the sequence of frames generated over time. In addition, each frame is generated to include or be associated with pose information indicating the pose of the HMD system when the frame is generated. At periodic preemption points, the GPU selects the frame stored at the plurality of frame buffers having the most recent frame number and applies an electronic display stabilization warp to the frame based on the difference between the current pose and the pose information stored with the selected frame.

Abstract: A technique includes determining a depth value for each of a plurality of pixels of a frame, down-sampling the depth values of a tile of the frame to obtain a plurality of down-sampled depth values, the frame including one or more tiles, determining a change in a head pose, determining, from the plurality of down-sampled depth values, a down-sampled depth value for a vertex, determining an adjusted position for the vertex based on the change in head pose and the down-sampled depth value for the vertex, performing, based on at least the adjusted position for the vertex, a depth-adjusted time-warping of the frame to obtain a depth-adjusted time-warped frame, and triggering display of the depth-adjusted time-warped frame.

Abstract: Display pre-distortion methods and apparatus for HMDs are disclosed. A disclosed example method includes determining a position of a pupil relative to a lens of the head-mounted display (HMD), determining, based on the determined position, a pre-distortion map for an image to be displayed on a display screen of the HMD, and displaying the image on the display screen of the HMD, wherein the image is modified by the pre-distortion map.

Abstract: An example technique may include performing a first time-warping of a scene of virtual reality content based on head pose information received during or after a rendering of the scene to obtain a time-warped scene, performing a second time-warping of an object based at least on object pose information received during or after a rendering of the object to obtain a time-warped object, and displaying on a display device a composite image based on the time-warped scene and the time-warped object.

Abstract: An application executed at a central processing unit (CPU) of a head mounted display (HMD) system generates sets of frame drawing commands for a graphics processing unit (GPU), and for each set of frame drawing commands the GPU renders a corresponding frame into one of a plurality of frame buffers. Each frame is generated to include or be associated with a frame number that indicates the location of the frame in the sequence of frames generated over time. In addition, each frame is generated to include or be associated with pose information indicating the pose of the HMD system when the frame is generated. At periodic preemption points, the GPU selects the frame stored at the plurality of frame buffers having the most recent frame number and applies an electronic display stabilization warp to the frame based on the difference between the current pose and the pose information stored with the selected frame.

Abstract: Methods, systems, and apparatuses, including computer programs encoded on a computer storage medium, for rendering application content are disclosed. In one embodiment a content receiver receives application content for rendering on a display unit of a computing device. A first processing unit renders the application content onto a first frame of a plurality of frames, and a second processing unit sequentially renders the plurality of frames onto the display unit. A counter counts of a number of outstanding frames as provided by the first processing unit to the second processing unit relative to corresponding acknowledgement messages indicating that one of the outstanding frames has been rendered onto the display unit. If the count is less than a threshold, the first processing unit renders the application content onto the first frame, otherwise the first processing unit waits to render the application content until the count is less than the threshold.

Abstract: Provided is a method and an apparatus for selectively returning parameters from an invoked object. Specifically, a requestor can invoke an object by transmitting a message. The message can include specified return parameters from an interface, such as an interface definition language (IDL). Alternatively, an object stub locally accessible by the requester can be invoked. The object stub, similar to the IDL, can specify the parameters to return. After the execution of a method in the invoked object, the requestor receives the return parameters or a subset of the return parameters previously selected.

Abstract: Provided is a method and apparatus for virtualizing access to resources in a distributed peer-to-peer (P2P) network. Specifically, a resource locally managed by a peer in the P2P network can be published such that other peers can identify the peer managing the resource. Any peer requesting access to the resource of another peer establishes communication to the peer managing the resource. After establishing communication, a proxy of the peer managing the resource can establish a proxy interface. The proxy interface operating on the peer requesting access, permits the peer requesting access to generate command and control data to control the resource. Thus, the peer requesting access believes that it manages the local resource, while in reality, the peer requesting access only has virtualized access to the resource.

Abstract: Provided is a method and apparatus for virtualizing access to resources in a distributed peer-to-peer (P2P) network. Specifically, a resource locally managed by a peer in the P2P network can be published such that other peers can identify the peer managing the resource. Any peer requesting access to the resource of another peer establishes communication to the peer managing the resource. After establishing communication, a proxy of the peer managing the resource can establish a proxy interface. The proxy interface, operating on the peer requesting access, permits the peer requesting access to generate command and control data to control the resource. Thus, the peer requesting access believes that it manages the local resource, while in reality, the peer requesting access only has virtualized access to the resource.