Cylindrical wrapping using shader hardware
US7663621B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 2006 |
| Grant date | Feb 16, 2010 |
| Priority date | — |
| Expiry date | Apr 11, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T15/04
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Circuits, methods, and apparatus that perform cylindrical wrapping in software without the need for a dedicated hardware circuit. One example performs cylindrical wrapping in software running on shader hardware. In one specific example, the shader hardware is a unified shader that alternately processes geometry, vertex, and fragment information. This unified shader is formed using a number of single-instruction, multiple-data units. Another example provides a method of performing a cylindrical wrap that ensures that a correct texture portion is used for a triangle that is divided by a “seam” of the wrap. To achieve this, primitive vertices are sorted such that results are vertex order invariant. One vertex is selected as a reference. For the other vertices, a difference is found for each coordinate and a corresponding coordinate of the reference vertex. If the coordinates are near, no change is made. If the coordinates are distant, the coordinate is adjusted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.