Compression and decompression of indices in a graphics pipeline

摘要

A compute unit accesses a chunk of bits that represent indices of vertices of a graphics primitive. The compute unit sets values of a first bit to indicate whether the chunk is monotonic or ordinary, second bits to define an offset that is determined based on values of indices in the chunk, and sets of third bits that determine values of the indices in the chunk based on the offset defined by the second bits. The compute unit writes a compressed chunk represented by the first bit, the second bits, and the sets of third bits to a memory. The compressed chunk is decompressed and the decompressed indices are written to an index buffer. In some embodiments, the indices are decompressed based on metadata that includes offsets that are determined based on values of the indices and bitfields that indicate characteristics of the indices.