Add callback on_mapblocks_changed

[minetest.git] / src / tileanimation.cpp

diff --git a/src/tileanimation.cpp b/src/tileanimation.cpp
index 930fd94731013089bda7a8dde8c243f4c92eba77..025d27d91054b81df9745f06a7670c5466c82d82 100644 (file)
--- a/src/tileanimation.cpp
+++ b/src/tileanimation.cpp
@@ -19,21 +19,27 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "tileanimation.h"
 #include "util/serialize.h"
 
-void TileAnimationParams::serialize(std::ostream &os, u8 tiledef_version) const
+void TileAnimationParams::serialize(std::ostream &os, u16 protocol_ver) const
 {
+       // The particle code overloads the length parameter so that negative numbers
+       // indicate an extra feature which old clients don't understand (crash).
+       // In hindsight it would have been better to use an extra parameter for this
+       // but we're stuck with this now.
+       const bool need_abs = protocol_ver < 40;
+
        writeU8(os, type);
        if (type == TAT_VERTICAL_FRAMES) {
                writeU16(os, vertical_frames.aspect_w);
                writeU16(os, vertical_frames.aspect_h);
-               writeF32(os, vertical_frames.length);
+               writeF32(os, need_abs ? fabs(vertical_frames.length) : vertical_frames.length);
        } else if (type == TAT_SHEET_2D) {
                writeU8(os, sheet_2d.frames_w);
                writeU8(os, sheet_2d.frames_h);
-               writeF32(os, sheet_2d.frame_length);
+               writeF32(os, need_abs ? fabs(sheet_2d.frame_length) : sheet_2d.frame_length);
        }
 }
 
-void TileAnimationParams::deSerialize(std::istream &is, u8 tiledef_version)
+void TileAnimationParams::deSerialize(std::istream &is, u16 protocol_ver)
 {
        type = (TileAnimationType) readU8(is);