Approximate trilinear filtering
US11120605B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 2020 |
| Grant date | Sep 14, 2021 |
| Priority date | — |
| Expiry date | Mar 24, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2210/36
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A texture filtering unit and a method are disclosed that provide multiple variants of an approximate trilinear filtering operation. A texture sampling and filtering unit may be configured to determine a level-of-detail (LOD) value for a sample point in texture space, and select, based on the LOD value, a fine mip-level and a coarse mip-level from the mip-map. The closer of the two selected mip-levels to the sample point is determined, and farther of the two selected mip-levels from the sample point is determined. A first quad of texels in the closer mip-level and a second quad of texels in the farther mip-level are then determined. A total of five or fewer texels are selected from the first quad of texels and from the second quad of texels. A filtered value for the sample point is determined based on an approximate trilinear filtering operation on the selected texels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.