tree b480fda93f31856e74636bfa4cb4d3c7b9659024
parent 0e489fd36061352e79cb4fb90f71f1b901211452
author Boris Brezillon <boris.brezillon@collabora.com> 1560764593 +0200
committer Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> 1560864967 -0700

nir/lower_tex: Add a way to lower TXS(non-0-LOD) instructions

The V3D driver has an open-coded solution for this, and we need the
same thing for Panfrost, so let's add a generic way to lower TXS(LOD)
into max(TXS(0) >> LOD, 1).

Changes in v2:
* Use == 0 instead of !
* Rework the minification logic as suggested by Jason
* Assign cursor pos at the beginning of the function
* Patch the LOD just after retrieving the old value

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>