[Mesa-dev] [PATCH 00/14] Enable sRGB-encoded fast-clears on CannonLake

[Nanley Chery]

Starting with CannonLake, the sampler no longer decodes the surface
state clear color when using an sRGB-formatted texture. This change
requires that our driver perform this decode in software instead. We
accounted for this change initially by disabling fast-clears when sRGB
encode was enabled. This series implements the software decode and
re-enables sRGB-encoded fast-clears.

The software decode is performed through a new getter for the miptree
clear color. To keep the miptree API balanced and to discourage its
users from accessing the clear color field directly, we add a getter for
the depth clear value and change the existing setters so that the user
no longer needs to know the current clear color to perform an efficient
clear operation.

Two piglit tests have been modified to test that the linearization of
the clear color occurs (when appropriate) for shader texture() calls and
on framebuffer blit sources. The modification patches can be found here:
https://lists.freedesktop.org/archives/piglit/2018-March/023996.html

Jason Ekstrand (1):
  util/srgb: Add a float sRGB -> linear helper

Nanley Chery (13):
  i965: Use the brw_context for the clear color and value setters
  i965/miptree: Move the clear color and value setter implementations
  i965: Make the miptree clear color setter take a gl_color_union
  i965/miptree: Add and use a getter for the clear color
  i965/miptree: Extend the sRGB-blending WA to future platforms
  i965/meta_util: Re-enable sRGB-encoded fast-clears on CNL
  i965: Add and use a getter for depth miptree clear values
  i965: Allow failure when setting the depth clear value
  i965/brw_clear: Don't resolve to change the depth clear value
  i965/brw_clear: Delete redundant code
  i965/blorp: Also skip the fast clear if the clear color differs
  i965/miptree: Allow failure when setting the clear color
  i965/blorp: Delete redundant code

 src/mesa/drivers/dri/i965/brw_blorp.c            |  60 +++------
 src/mesa/drivers/dri/i965/brw_clear.c            |  45 +------
 src/mesa/drivers/dri/i965/brw_meta_util.c        |  11 --
 src/mesa/drivers/dri/i965/brw_misc_state.c       |  15 ---
 src/mesa/drivers/dri/i965/brw_wm_surface_state.c |   4 +-
 src/mesa/drivers/dri/i965/gen6_depth_state.c     |   4 +-
 src/mesa/drivers/dri/i965/gen7_misc_state.c      |   3 +-
 src/mesa/drivers/dri/i965/gen8_depth_state.c     |   3 +-
 src/mesa/drivers/dri/i965/intel_mipmap_tree.c    | 165 ++++++++++++++++++++++-
 src/mesa/drivers/dri/i965/intel_mipmap_tree.h    |  53 ++++----
 src/util/format_srgb.h                           |  14 ++
 11 files changed, 233 insertions(+), 144 deletions(-)

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2.16.2