anv/blorp: Don't fast depth clear samplable HiZ buffers on BDW
Avoid the resolves that would be required if fast depth clears were
allowed for such buffers.
Signed-off-by: Nanley Chery <nanley.g.chery@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
diff --git a/src/intel/vulkan/anv_blorp.c b/src/intel/vulkan/anv_blorp.c
index b161400..2edd071 100644
--- a/src/intel/vulkan/anv_blorp.c
+++ b/src/intel/vulkan/anv_blorp.c
@@ -1271,6 +1271,15 @@
* ANV_HZ_FC_VAL.
*/
clear_with_hiz = false;
+ } else if (gen == 8 &&
+ anv_can_sample_with_hiz(cmd_buffer->device->info.gen,
+ iview->image->samples)) {
+ /* Only gen9+ supports returning ANV_HZ_FC_VAL when sampling a
+ * fast-cleared portion of a HiZ buffer. Testing has revealed
+ * that Gen8 only supports returning 0.0f. Gens prior to gen8 do
+ * not support this feature at all.
+ */
+ clear_with_hiz = false;
}
}
