Advanced Micro Devices Corporation

Ati Technologies Ulc

Daniel James Skinner

Michael John Livesley

David William John Pankratz

David Ronald Oldcorn

Kiia Kallio

Miikka Kangasluoma

Sean Keely

David Kirk Mcallister

A technique for performing ray tracing operations is provided. The technique includes identifying triangles to include in a compressed triangle block; storing data common to the identified triangles as common data of the compressed triangle block; and storing data unique to the identified triangles as unique data of the compressed triangle block.

Bounding volume hierarchy leaf node compression

A technique for performing ray tracing operations is provided. The technique includes determining error bounds for a rotation operation for a ray; selecting a technique for determining whether the ray intersects a bounding box based on the error bounds; and determining whether the ray hits the bounding box based on the selected technique.

Technique for testing ray for intersection with oriented bounding boxes

An implementation comprises traversing a bounding volume hierarchy for each ray of a plurality of rays concurrently using a plurality of execution items. In response to determining that a first execution item of the plurality of execution items is finished traversing the bounding volume hierarchy for a first ray of the plurality rays, the embodiment causes the first execution item to traverse the bounding volume hierarchy for a second ray of the plurality of rays while a second execution item of the plurality of execution items traverses the bounding volume hierarchy for the second ray. And the embodiment comprises initiating side-effects with the first and second execution items in an order indicated by the bounding volume hierarchy.

Traversing multiple regions of a bounding volume hierarchy in parallel

One or more rotated bounding volumes are generated for one or more nodes of a bounding volume hierarchy (BVH). Volume intersection ray tracing tests are then be performed using the rotated bounding volumes with the aim of reducing the number of calculations required relative to an original, non-rotated bounding volume. Rotated bounding volumes are selected from a plurality of candidate rotations, and selection of one of the candidate rotations are based on surface areas, such as minimum total surface areas, of bounding volumes corresponding to each of the candidate rotations. In order to minimize data storage and increase performance, a number of candidate rotations may be limited to a predetermined set of rotations.

Volume intersection using rotated bounding volumes

A technique for performing ray tracing operations is provided. The technique includes, in response to detecting that a threshold number of traversal stage work-items of a wavefront have terminated, increasing intersection test parallelization for non-terminated work-items.

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Milton Keynes, United Kingdom

Daniel James Skinner