Video display processor having indication of sprite in excess of

Details Video display processor having indication of sprite in excess of Video display processor having indication of sprite in excess of

1995-06-07

1998-08-11

Powell, Mark R.

Computer graphics processing and selective visual display system

Display peripheral interface input device

345153, 345199, G09G 502

Patent

active

057933510

ABSTRACT:
A video display processor and video display system which overlays mobile patterns called sprites over a background. For each horizontal line the video display processor reads from an external memory data corresponding to sprites appearing on that line. This sprite data is loaded into N sprite registers. For each pixel in the horizontal line a display priority logic selects for display either the highest priority sprite or a background display if that pixel includes no sprites. If there are more than N sprites for a particular horizontal line, then an additional sprite status flag is set. The additional sprite status flag may be read by a host processor via a processor port. Reading the additional sprite status flag resets the flag. Each sprite includes a sprite number. An additional sprite number register is loaded with the sprite number of the N+1st mobile pattern on the horizontal line. This additional sprite number register may be read by a host processor via a processor port. In the preferred embodiment, the additional sprite status flag, the additional sprite number register and a sprite coincidence flag consist of respective bits of a host processors readable status register.

REFERENCES:
patent: 5089811 (1992-02-01), Leach
patent: 5379049 (1995-01-01), Leach
patent: 5552804 (1996-09-01), Leach

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