Method and system for fast interpolation of depth buffer values

Details Method and system for fast interpolation of depth buffer values Method and system for fast interpolation of depth buffer values

1995-10-06

1998-05-05

Nguyen, Phu K.

395119, G06T 1540

Patent

active

057488630

ABSTRACT:
A graphics system that performs fast interpolation of depth buffer values is provided within a host data processing system that includes a host processor executing a graphics application having graphics data that includes depth data. The graphics system comprises a memory/graphics controller that converts graphics data to pixel data, wherein the memory/graphics controller includes means for receiving an initial depth buffer value from the host processor in a floating-point format having a sign bit, an exponent and a mantissa, means for generating an accumulator value from the mantissa, means for receiving a delta depth value from the host processor, means for performing an integer addition of the accumulator value to the delta depth value to produce a sum, and means for generating a floating-point depth buffer value for a display pixel from the sum, the sign bit and the exponent of the initial depth value. The host data processing system includes a graphics adapter that receives display pixel data from the controller, including a depth buffer value for each pixel, and that converts the display pixel data to output signals for driving an output display device.

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