Ati Technologies Inc.

Appian Graphics Corp.

Etma, Inc.

Tom C Martyn

Michael K Larson

Richard L Clark

A direct access driver solves limitations of DirectX operation under the Microsoft architecture when using multiple monitors. The direct access driver allows applications employing DirectX application program interfaces to use hardware acceleration without display errors on the monitors. Display errors can occur if multiple frame buffer addresses are returned in response to 'GetFrameBufferAddress' DirectX calls. A single address is returned for two or more frame buffers on a display driver card by performing, without the DirectX application's knowledge, background operations that track hardware acceleration demands from two or more graphic user interfaces and frame buffers. The background operations entail constantly changing the frame buffer pointers relative to the location of offscreen DirectX application data, while one or more DirectX applications are moved in the display space from monitor to monitor.

Method for displaying single monitor applications on multiple monitors driven by a personal computer

A direct access driver solves limitations of DirectX operation under the Microsoft architecture when using multiple monitors. The direct access driver allows applications employing DirectX application program interfaces to use hardware acceleration without display errors on the monitors. Display errors can occur if multiple frame buffer addresses are returned in response to &ldquo;GetFrameBufferAddress&rdquo; DirectX calls. This invention returns a single address for two or more frame buffers on a display driver card by performing, without the DirectX application's knowledge, background operations that track hardware acceleration demands from two or more graphic user interfaces and frame buffers. The background operations entail constantly changing the frame buffer pointers relative to the location of offscreen DirectX application data, while one or more DirectX applications are moved in the display space from monitor to monitor. This is analogous to accurately tracking one of many moving objects in a fast-moving shell game.

A multi-monitor computer system (,) includes a configuration address space (,) for software driven initialization and configuration. A monitor synchronization method (,) of this invention includes temporarily remapping multiple graphics chips (,) to a same base address (,) so that attempts to write to a memory mapped register on one of the graphics chips, also writes the same register on the other graphics chips. Once the addresses are remapped, writing chip enabling data to an enabling register on one of the graphics chips causes enabling data to be written to all graphics chips at the same time, thereby synchronizing the vertical and horizontal sync signals generated by the graphics chips. Finally, remapping the graphics chips to their original base memory addresses allows the computer system to resume selective addressing of the graphics chips, which now provide synchronized vertical and horizontal sync signals to their respective monitors.

Computer system with multiple monitor control signal synchronization apparatus and method

A desktop manager application (20) manages graphical object creation, repositioning, resizing and related object placement functions in the context of a multi-monitor or other enhanced desktop environment. In a preferred implementation, the program manager (20) manages multi-pass window creation by allowing a graphical user interface operating system (16) to fill in a window structure in a hidden form and thereafter analyzing the window's coordinates relative to selected display criteria such as avoiding monitor splits. Based on this analysis, the program manager (20) selectively repositions the window under consideration in accordance with the display criteria. The program manager (20) thus provides a more user friendly interface between a GUI operating system (16) and applications in the enhanced desktop environment.

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Seattle, WA, United States of America

Tom C Martyn