Microsoft Technology Licensing, LLC

Daniel Wood

Max Alan McMullen

Leonardo Esteban Blanco

Silvana Patricia Moncayo

Andrei Baioura

Marcus J Andrews

Michael I Borysenko

Mikhail V Leonov

Zhigang Xu

Brian T Klamik

Bennett Sorbo

Keith D Melmon

Allison Klein

Michael P Crider

Vlad Alexandrov

Daniel Ryan Lehenbauer

Alexander Stevenson

Mary Luo

Hang Li

Nadim Y Abdo

Adam M Smith

Reiner Fink

Anuj Bharat Gosalia

Benjamin C Constable

Joshua Warren Priestley

Ameet Arun Chitre

Onur Filiz

Mohamed Sadek

Aleksandar Antonijevic

Alice Tang

Imran Majid

Deepali Bhagvat

J Jordan C Parker

Max Mcmullen

Marcus Andrews

Mikhail Leonov

To manage dynamic adjustment of the refresh rate of a computer display, the operating system defines at least two playback modes: one or more custom modes that can be selected by applications, and a standard mode which is a default setting for the system that can be expected by applications. The operating system provides an application programming interface that enables an application to request using a custom mode. If approved to use the custom mode, then the application presents frames for display based on the custom mode. The operating system stores timing data for each buffered frame indicating how to play the frame in both standard mode and the custom mode. If a transition back to the standard mode occurs, the operating system uses the timing data to properly present frames of video until the application stops generating frames of video in the custom mode.

Managing transitions of adaptive display rates for different video playback scenarios

Techniques for improved command level remoting are disclosed. In embodiments of the invention, commands to generate vertices are sent in a terminal service session. As commands to draw vertices are generated by a server to be sent to a client to display, they are analyzed by the server. Where some of those vertices have been previously sent to the client, such as to generate a previous bitmap image, the server determines not to send those vertices to the client, and sends the client the new vertices.

Command remoting techniques

Buffer display techniques are described. In one or more implementations, at least part of an off-screen buffer is rasterized by an application to generate an item for display by the computing device. One or more communications are formed that describe the part of the off-screen buffer which contains the item that is to be copied to update an onscreen buffer.

Buffer display techniques

Atlasing and virtual surface techniques are described. In one or more implementations, virtual surface functionality is exposed by an operating system for access by one or more applications of the computing device. A virtual surface is created in response to a request from the one or more applications to be used to render visuals for display by a display device. The virtual surface is allocated in memory of the computing device by the exposed virtual surface functionality to have an area that is larger than an area to be used to display the visuals from the one or more applications.

Atlasing and virtual surfaces

A technique for generating content for a stereo 3D display buffer having both stereo 3D graphic objects and non-stereo 3D graphic objects that may be utilized to render stereo 3D content onto one or more windows of a display. The technique incorporates content from stereo 3D application frame buffers into a composition tree that represents the graphic objects in each window displayed on a computing device. At each refresh cycle, the composition tree is traversed to generate content for a stereo 3D display buffer that is then used to draw one or more windows onto a display.

Composing stereo 3D windowed content

A lighting model specified in light space may be transformed to a 3D scene, which may include numerous lights. When the lighting model is transformed to the 3D scene and is uniformly scaled or near-uniformly scaled, intensity or brightness of light at sample points, corresponding to points in the 3D scene, may be adjusted proportionately for a light source using a value based, at least partly, on a transform matrix. When the lighting model in the light space is scaled to non-uniformly stretch a lit area, the sample points may be transformed to the light space, using an inverse of a transform matrix. Distances from the light source to the transformed sample points in the light space may be used to determine attenuation and range with respect to the light source.

Realistic transformation of 3D lighting models

Various technologies and techniques are disclosed that improve the automatic generation of near and far clipping planes for a 3D scene. The viewing frustum is intersected with the scene to determine the range of depth that a particular scene occupies in the viewing frustum. The ratio of the near clipping plane to far clipping plane is adjusted as appropriate to ensure a desired minimum level of Z-buffer precision is achieved. The clipping planes are set sufficiently far outside of the object bounds to prevent triangles which are parallel to the clip planes from being accidentally clipped. An API is provided to allow other programs to retrieve the near and far clipping plane values with the desired minimum Z-buffer precision for a particular scene without having to interact with the Z-buffer.

Automatically generating appropriate near and far clipping planes for a 3D scene while guaranteeing minimum of Z-buffer precision

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Seattle, WA, United States of America

Daniel Wood