intel/blorp: Handle the 512 layers restriction on Sandy Bridge

Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/intel/blorp/blorp.c

@@ -139,6 +139,12 @@ brw_blorp_surface_info_init(struct blorp_context *blorp,
       info->view.array_len -= info->view.base_array_layer;
       info->z_offset = 0;
    }
+
+   /* Sandy Bridge has a limit of a maximum of 512 layers for layered
+    * rendering.
+    */
+   if (is_render_target && blorp->isl_dev->info->gen == 6)
+      info->view.array_len = MIN2(info->view.array_len, 512);
 }