i965: Refactor brw_is_hiz_depth_format()

Every caller of this function uses it to determine if the current
miptree needs a hiz buffer to be allocated. Strangely, the function
doesn't take a miptree argument. So, this function effectively decides
if and when a miptree's hiz buffer gets allocated without inspecting the
miptree itself.  Luckily, the driver behaves correctly despite the
brw_is_hiz_depth_format's quirk.

I will soon make some changes to the miptree that will require
inspecting the miptree to determine if it needs a hiz buffer. So this
patch renames
    brw_is_hiz_depth_format -> intel_miptree_wants_hiz_buffer
and gives it a miptree parameter.

This patch shouldn't change any behavior.

Reviewed-by: Kenneth Graunke <[email protected]>
Reviewed-by: Tapani Pälli <[email protected]>
Reviewed-by: Topi Pohjolainen <[email protected]>

1 files changed, 4 insertions, 1 deletions

diff --git a/src/mesa/drivers/dri/i965/intel_mipmap_tree.h b/src/mesa/drivers/dri/i965/intel_mipmap_tree.h
index 3c41893212a..0cb64d2fef1 100644
--- a/src/mesa/drivers/dri/i965/intel_mipmap_tree.h
+++ b/src/mesa/drivers/dri/i965/intel_mipmap_tree.h
@@ -632,12 +632,15 @@ intel_miptree_copy_teximage(struct brw_context *brw,
  * functions on a miptree without HiZ. In that case, each function is a no-op.
  */
 
+bool
+intel_miptree_wants_hiz_buffer(struct brw_context *brw,
+			       struct intel_mipmap_tree *mt);
+
 /**
  * \brief Allocate the miptree's embedded HiZ miptree.
  * \see intel_mipmap_tree:hiz_mt
  * \return false if allocation failed
  */
-
 bool
 intel_miptree_alloc_hiz(struct brw_context *brw,
 			struct intel_mipmap_tree *mt);