Computer graphics processing and selective visual display system – Display driving control circuitry – Controlling the condition of display elements
Patent
1991-07-05
1993-09-14
Shaw, Dale M.
Computer graphics processing and selective visual display system
Display driving control circuitry
Controlling the condition of display elements
395157, 395163, 345119, G06F 1520
Patent
active
052457028
ABSTRACT:
A method for allowing direct graphics access to backup storage areas in frame buffer memory used for retained windows and controlled by a graphics accelerator which includes the steps of establishing a shared memory file in system memory for the backup storage area indicating that the retained windows area initially exists in excess frame buffer memory, the shared memory file having storage to indicate the use of the shared area by a process; generating a page fault whenever access to the graphics accelerator is attempted and the state of another process is stored on the graphics accelerator; and calling a device driver in response to the page fault to switch the context stored on the graphics accelerator to that of the process attempting the access.
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patent: 4047243 (1977-09-01), Dijkstra
patent: 4903218 (1990-02-01), Longo et al.
patent: 4945499 (1990-07-01), Asari et al.
patent: 5043923 (1991-08-01), Joy et al.
patent: 5127098 (1992-06-01), Rosenthal et al.
patent: 5159665 (1992-10-01), Priem et al.
McIntyre Bruce
Priem Curtis
Rocchetti Robert
Shaw Dale M.
Sun Microsystems Inc.
Tung Kee M.
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