diff --git a/src/asahi/lib/agx_usc.h b/src/asahi/lib/agx_usc.h
index f5fc9103eb0..163c8d1ac4b 100644
--- a/src/asahi/lib/agx_usc.h
+++ b/src/asahi/lib/agx_usc.h
@@ -62,6 +62,14 @@ agx_usc_builder_validate(struct agx_usc_builder *b, size_t size)
         it; it = false, (b)->head += AGX_USC_##struct_name##_LENGTH)           \
       agx_pack((b)->head, USC_##struct_name, template)
 
+#define agx_usc_push_blob(b, blob, length)                                     \
+   for (bool it = agx_usc_builder_validate((b), length); it;                   \
+        it = false, (b)->head += length)                                       \
+      memcpy((b)->head, blob, length);
+
+#define agx_usc_push_packed(b, struct_name, packed)                            \
+   agx_usc_push_blob(b, packed.opaque, AGX_USC_##struct_name##_LENGTH);
+
 static void
 agx_usc_uniform(struct agx_usc_builder *b, unsigned start_halfs,
                 unsigned size_halfs, uint64_t buffer)