Methods and apparatus for order-independent occlusion computations

An apparatus for graphics processing, comprising:

• a memory;
• and
• at least one processor coupled to the memory and configured to:
• generate a volumetric grid based on a viewing area corresponding to a viewpoint in a scene;
• determine geometry information for each of a plurality of primitives associated with the viewpoint in the scene;
• calculate at least one of surface information and disocclusion information based on the geometry information for each of the plurality of primitives, wherein the surface information and the disocclusion information are associated with the volumetric grid based on the viewing area corresponding to the viewpoint, wherein the volumetric grid is associated with a surface buffer corresponding to the surface information and a disocclusion buffer corresponding to the disocclusion information, wherein the surface buffer includes a plurality of surface cells and the disocclusion buffer includes a plurality of disocclusion cells;
• calculate visibility information for each of the plurality of primitives based on at least one of the surface information and the disocclusion information, wherein the visibility information is associated with the volumetric grid, wherein the volumetric grid is associated with a visibility buffer corresponding to the visibility information, wherein the visibility buffer includes a plurality of visibility cells;
• store the surface information in the surface buffer, the disocclusion information in the disocclusion buffer, and the visibility information in the visibility buffer;
• and
• determine whether each of the plurality of primitives is visible based on the visibility information for each of the plurality of primitives.

An apparatus for graphics processing, comprising:

• means for generating a volumetric grid based on a viewing area corresponding to a viewpoint in a scene;
• means for determining geometry information for each of a plurality of primitives associated with the viewpoint in the scene;
• means for calculating at least one of surface information and disocclusion information based on the geometry information for each of the plurality of primitives, wherein the surface information and the disocclusion information are associated with the volumetric grid based on the viewing area corresponding to the viewpoint, wherein the volumetric grid is associated with a surface buffer corresponding to the surface information and a disocclusion buffer corresponding to the disocclusion information, wherein the surface buffer includes a plurality of surface cells and the disocclusion buffer includes a plurality of disocclusion cells;
• means for calculating visibility information for each of the plurality of primitives based on at least one of the surface information and the disocclusion information, wherein the visibility information is associated with the volumetric grid, wherein the volumetric grid is associated with a visibility buffer corresponding to the visibility information, wherein the visibility buffer includes a plurality of visibility cells;
• means for storing the surface information in the surface buffer, the disocclusion information in the disocclusion buffer, and the visibility information in the visibility buffer;
• and
• means for determining whether each of the plurality of primitives is visible based on the visibility information for each of the plurality of primitives.

A non-transitory computer-readable medium storing computer executable code for graphics processing, the code when executed by a processor causes the processor to:

• generate a volumetric grid based on a viewing area corresponding to a viewpoint in a scene;
• determine geometry information for each of a plurality of primitives associated with the viewpoint in the scene;
• calculate at least one of surface information and disocclusion information based on the geometry information for each of the plurality of primitives, wherein the surface information and the disocclusion information are associated with the volumetric grid based on the viewing area corresponding to the viewpoint, wherein the volumetric grid is associated with a surface buffer corresponding to the surface information and a disocclusion buffer corresponding to the disocclusion information, wherein the surface buffer includes a plurality of surface cells and the disocclusion buffer includes a plurality of disocclusion cells;
• calculate visibility information for each of the plurality of primitives based on at least one of the surface information and the disocclusion information, wherein the visibility information is associated with the volumetric grid, wherein the volumetric grid is associated with a visibility buffer corresponding to the visibility information, wherein the visibility buffer includes a plurality of visibility cells;
• store the surface information in the surface buffer, the disocclusion information in the disocclusion buffer, and the visibility information in the visibility buffer;
• and
• determine whether each of the plurality of primitives is visible based on the visibility information for each of the plurality of primitives.