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Disclosed is a method that uses a set of four spatially adjacent 2x2 filters to implement a 4x4 texture filter. Benefits include simplifying the implementation process, as well as saving die area.
English (United States)
This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately
94% of the total text.
Method of Implementing a 4x4 Texture
Filter Leveraging Existing Hardware of a 2x2 Filter
Disclosed is a method that uses a set of four spatially adjacent 2x2 filters to
implement a 4x4 texture filter. Benefits include simplifying the implementation
process, as well as saving die area.
graphics processors support bilinear filtering, in which a 2x2 block of texels
is read from the source map and blended to write to the destination pixel. In
addition, a 4x4 filter has been implemented which reads 16 texels from the
source map. Specialized hardware to fetch 4x4 texel blocks is expensive, and
duplicates much of the hardware functionality used to fetch 2x2 texel blocks.
reduce changes to the hardware, the disclosed method uses a set of four
spatially adjacent 2x2 filters; this avoids changes to much of the graphics
pipeline, saving implementation effort as well as die area.
Figure 1 shows four 2x2 filters combined to form a 4x4
filter. The violet “X” shows the pixel mapping point to the texture map, and
the four red “X”s show the four derived pixel mapping points, which are
inserted into the pipeline to fetch the four 2x2 filters for the bilinear
2 shows that the middle of the pipeline is left unchanged by the addition of
the 4x4 filter capability.
Some implementations of the disclosed structure and method
provide one or more of the following advantages:
The disclosed method simplifies the implementation p...