anv: Handle NULL descriptors

Reviewed-by: Caio Marcelo de Oliveira Filho <[email protected]>
Reviewed-by: Lionel Landwerlin <[email protected]>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4767>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/intel/vulkan/anv_private.h b/src/intel/vulkan/anv_private.h
index 352d4b8e249..ed851f5aacf 100644
--- a/src/intel/vulkan/anv_private.h
+++ b/src/intel/vulkan/anv_private.h
@@ -1292,9 +1292,19 @@ struct anv_device {
     struct anv_state_pool                       binding_table_pool;
     struct anv_state_pool                       surface_state_pool;
 
+    /** BO used for various workarounds
+     *
+     * There are a number of workarounds on our hardware which require writing
+     * data somewhere and it doesn't really matter where.  For that, we use
+     * this BO and just write to the first dword or so.
+     *
+     * We also need to be able to handle NULL buffers bound as pushed UBOs.
+     * For that, we use the high bytes (>= 1024) of the workaround BO.
+     */
     struct anv_bo *                             workaround_bo;
     struct anv_bo *                             trivial_batch_bo;
     struct anv_bo *                             hiz_clear_bo;
+    struct anv_state                            null_surface_state;
 
     struct anv_pipeline_cache                   default_pipeline_cache;
     struct blorp_context                        blorp;