tree 91ba9dcf6d186f2aa872d51e228177638b7ab2dc
parent c4b1bfa9740df585c32b33831fe8ea78c59491f2
author Nicolas Capens <capn@google.com> 1511902499 -0500
committer Nicolas Capens <nicolascapens@google.com> 1512142453 +0000

Implement seamless cubemap sampling.

The addressing is offset by 1 to account for the border. Note that this
could be avoided by locking at (0, 0) instead of (-1, -1) instead, but
then negative address offsets have to be allowed and this complicates
the subsequent calculations and only unsigned extension from 32-bit to
64-bit is typically for free during memory accesses.

Change-Id: I5fb843401d440a9d77d141782124a9c260765830
Reviewed-on: https://swiftshader-review.googlesource.com/13289
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>