公开(公告)号：US10074210B1

公开(公告)日：2018-09-11

申请号：US15659188

申请日：2017-07-25

Applicant: Apple Inc.

Inventor： Christopher L. Spencer ,  Karl D. Mann ,  Ralph C. Taylor ,  Dinesh D. Kuwar

IPC: G06T15/50 ,  G06T15/60 ,  G06T15/40 ,  G06T15/00 ,  G06T15/08 ,  G06T15/80 ,  G06T17/20 ,  G09G5/00

CPC classification number: G06T15/40 ,  G06T11/40 ,  G06T15/005 ,  G06T15/08 ,  G06T15/80 ,  G06T17/20 ,  G09G5/00 ,  G09G5/363

Abstract: Techniques are disclosed relating to rendering graphics objects that require shader operations to determine visibility. In some embodiments, a graphics unit is configured to process feedback objects, which may require shading to determine whether they are visible relative to previously-processed objects, out of draw order. For example, in embodiments where a buffer is used to store fragment data for deferred rendering, the graphics unit may bypass the buffer and shade feedback objects ahead of earlier non-feedback objects whose fragment data is stored in the buffer. This may allow a determination of whether to remove occluded non-feedback fragment data from the buffer, which may reduce graphics overdraw. In disclosed two-pass techniques, data for feedback objects is first allowed to bypass the buffer for visibility shading, but is then stored in the buffer for a second pass to perform fragment shading to actually determine pixel attributes, which may further reduce overdraw.