MULTI MODE TEXTURE SAMPLER FOR FLEXIBLE FILTERING OF GRAPHICAL TEXTURE DATA

摘要

For a given texture address, a texture sampler fetches and reduces texture data with a filter accumulator suitable for providing a weighted average over a variety of filter footprints. A multi-mode texture sampler is configurable to provide both a wide variety of footprints in either a separable or non-separable filter modes and allow for a filter footprint significantly wider than the bi-linear (2×2 texel) footprint. In embodiments, sub-sample addresses are generated by the texture sampler logic to accommodate a desired footprint. The sub-sample addresses may be generated and sequenced by multi-texel units, such as 2×2 texel quads, for efficient filtering. In embodiments, filter coefficients are cached from coefficient tables stored in memory.

主权项

1. A graphics processing system, comprising:
a texel cache to store predetermined texel color values; a coefficient cache to store predetermined filter coefficient values; an execution unit to provide an input texture address; and texture sampler logic circuitry communicatively coupled to the execution unit, to the texel cache, and to the coefficient cache, the texture sampler to return filtered texture data to the execution unit based on the input texture address and cached values.