beam: new member source_name

New bolt class member source_name, which is automatically set if the
monster which created the beam kills itself.  Currently only used
when Fire Storm places fire vortexes, so that they'll have a monster
name for summon blaming.

1 files changed, 4 insertions, 0 deletions

diff --git a/crawl-ref/source/beam.h b/crawl-ref/source/beam.h
index 04f61ad300..20f03622cd 100644
--- a/crawl-ref/source/beam.h
+++ b/crawl-ref/source/beam.h
@@ -82,6 +82,10 @@ struct bolt
     // spl-mis.h (values are strictly greater than NON_MONSTER in that case)
     // for explosions generated by miscast effects. -cao
     int         beam_source;           // NON_MONSTER or monster index #
+    std::string source_name;           // The name of the source, if it
+                                       // should be different from
+                                       // actor->name(), or the actor dies
+                                       // prematurely.
     std::string name;
     std::string short_name;
     std::string hit_verb;              // The verb to use when this beam hits