anv: Re-use one old BT block in reset_batch_bo_chain

We intentionally throw away all but one BT block but then we set
cmd_buffer->bt_block to ANV_STATE_NULL instead of the one we hung on to.
This causes the command buffer to immediately re-emit STATE_BASE_ADDRESS
the first time a BT is needed for no good reason.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

diff --git a/src/intel/vulkan/anv_batch_chain.c b/src/intel/vulkan/anv_batch_chain.c
index 5b64a53b6e1cb22472417345b1ef1a8ac41fbcb9..1d4e853a91ee9e151cf8129f5f8a5faaa4233206 100644 (file)
--- a/src/intel/vulkan/anv_batch_chain.c
+++ b/src/intel/vulkan/anv_batch_chain.c
@@ -874,7 +874,8 @@ anv_cmd_buffer_reset_batch_bo_chain(struct anv_cmd_buffer *cmd_buffer)
       anv_binding_table_pool_free(cmd_buffer->device, *bt_block);
    }
    assert(u_vector_length(&cmd_buffer->bt_block_states) == 1);
-   cmd_buffer->bt_next = ANV_STATE_NULL;
+   cmd_buffer->bt_next = *(struct anv_state *)u_vector_head(&cmd_buffer->bt_block_states);
+   cmd_buffer->bt_next.offset = 0;
 
    anv_reloc_list_clear(&cmd_buffer->surface_relocs);
    cmd_buffer->last_ss_pool_center = 0;