tree dad9660221ace9406c80864fca69472fe0089884
parent 5b83eb0b0980a5f488ef4bab589f8537960f7072
author Nanley Chery <nanley.g.chery@intel.com> 1604336562 -0800
committer Dylan Baker <dylan.c.baker@intel.com> 1605639451 -0800

mesa: Clamp some depth values in glClearBufferfv

OpenGL 3.0 spec, section 4.2.3 "Clearing the Buffers":

   If buffer is DEPTH, drawbuffer must be zero, and value points to the
   single depth value to clear the depth buffer to. Clamping and type
   conversion for fixed-point depth buffers are performed in the same
   fashion as for ClearDepth.

Enables iris to pass the clearbuffer-depth piglit test.

v2. Add spec citation. (Eric Anholt)
v3. Don't clamp floating point formats. (Eric Anholt)

Cc: mesa-stable
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7410>
(cherry picked from commit 1bf539b3a2129779addde397886870c00045e6d7)