src/scenery, save: store dt as 16-bit fixed point

Bump save proto version.

1 files changed, 6 insertions, 1 deletions

diff --git a/serialize/world-reader.cpp b/serialize/world-reader.cpp
index f5459203..4d27c27f 100644
--- a/serialize/world-reader.cpp
+++ b/serialize/world-reader.cpp
@@ -173,7 +173,12 @@ void reader_state::read_chunks(reader_t& s)
                         else
                             sc.frame.frame << s;
                         if (sc.frame.active)
-                            sc.frame.delta << s;
+                        {
+                            if (PROTO >= 4) [[likely]]
+                                sc.frame.delta << s;
+                            else
+                                sc.frame.delta = (std::uint16_t)Math::clamp(int(s.read<float>() * 65535), 0, 65535);
+                        }
                     }
                     t.scenery() = sc;
                 }