Importance

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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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First Claim