Computer graphics processing and selective visual display system – Display driving control circuitry – Controlling the condition of display elements
Patent
1989-10-23
1993-10-19
Nguyen, Phu K.
Computer graphics processing and selective visual display system
Display driving control circuitry
Controlling the condition of display elements
395155, 345139, G06F 3153
Patent
active
052553590
ABSTRACT:
A graphics display system picking function tracks machine states of pickable primitive operators through the use of a pick stack and machine state memory. The pick stack operates as a stack when accessed by pipeline processors. Pipeline processors can add an element to the stack or remove elements from the stack as structures are processed. Selection or picking of an object causes a graphics control processor to randomly access the pick stack to determine the attributes of a picked primitive. The machine state memory is implemented as a video RAM allowing rapid copying of rows containing machine states for various structure levels in the hierarchy. A first area of the machine state memory stores the states relating to the structures in the hierarchy as they are executed. A second area retains an abbreviated state description for each pickable primitive while a final area contains abbreviated machine state information for picked objects to be echoed by the system. The pick stack and machine state memories operate together to provide rapid pick identification, picked primitive machine state identification, and picked primitive echoing. The use of separate picked primitive echo machine storage allows drawing of the picked primitives without a complete re-traversal of the displayed list. This also results in reduced processing time.
REFERENCES:
patent: 4847785 (1989-07-01), Stephens
patent: 4847786 (1989-07-01), Wang et al.
patent: 4870599 (1989-09-01), Hempel et al.
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Abi-Ezzi et al., "A Special Graphics System for PHIGS", Computers and Graphics, 1988, pp. 155-162.
Ebbers Timothy J.
Gibbons Daniel G.
Li David W.
Liang Bob C.
Tannenbaum David C.
International Business Machines - Corporation
Kinnaman Jr. William A.
Nguyen Phu K.
Walker Mark S.
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