Method and apparatus for fractional double buffering
US4910683A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1988 |
| Grant date | Mar 20, 1990 |
| Priority date | — |
| Expiry date | Dec 20, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T15/20
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A user, through the use of an input device, provides signals indicative of x,y and z coordinates to a host central processing unit (CPU). The x,y and z coordinates provided by a user correspond to a desired viewpoint for the display of an object stored in an original data image memory. A graphics CPU is coupled to the host CPU for receipt of the x,y and z coordinates as well as to the original data image memory. The graphics CPU is further coupled to a program memory as well as two display buffers, each of which of comprises a bit map of points on the display. The graphics CPU, executing a rendering program stored in the program memory, renders (writes) the data comprising the object for the viewpoint corresponding to the x,y and z coordinates provided by the user. After a predetermined percentage (N) of data comprising the object have been rendered into the non-displayed buffer, the graphics CPU signals a multiplexor which couples the display to the previously non-displayed display buffer, thereby displaying the predetermined percentage (N) of data which have been rendered. In the event that the user does not provide any new x,y and z coordinates representing a different viewpoint…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.