From b29a42719cd32bcf3af4725aa2b3f97d8ebc5107 Mon Sep 17 00:00:00 2001
From: Benau <Benau@users.noreply.github.com>
Date: Fri, 6 Dec 2019 14:10:45 +0800
Subject: [PATCH] Expose item manager random seed (synchronized in online too)
 in scripting

---
 src/items/item_manager.cpp        |  1 +
 src/items/item_manager.hpp        |  9 +++++++++
 src/scriptengine/script_track.cpp | 10 ++++++++++
 3 files changed, 20 insertions(+)

diff --git a/src/items/item_manager.cpp b/src/items/item_manager.cpp
index 1fab147ff..e55947b02 100644
--- a/src/items/item_manager.cpp
+++ b/src/items/item_manager.cpp
@@ -50,6 +50,7 @@ std::vector<video::SColorf>  ItemManager::m_glow_color;
 bool                         ItemManager::m_disable_item_collection = false;
 std::shared_ptr<ItemManager> ItemManager::m_item_manager;
 std::mt19937                 ItemManager::m_random_engine;
+uint32_t                     ItemManager::m_random_seed = 0;
 
 //-----------------------------------------------------------------------------
 /** Creates one instance of the item manager. */
diff --git a/src/items/item_manager.hpp b/src/items/item_manager.hpp
index 985b7a5dc..10da49e05 100644
--- a/src/items/item_manager.hpp
+++ b/src/items/item_manager.hpp
@@ -54,6 +54,8 @@ private:
     static bool m_disable_item_collection;
 
     static std::mt19937 m_random_engine;
+
+    static uint32_t m_random_seed;
 protected:
     /** The instance of ItemManager while a race is on. */
     static std::shared_ptr<ItemManager> m_item_manager;
@@ -66,7 +68,14 @@ public:
     static void updateRandomSeed(uint32_t seed_number)
     {
         m_random_engine.seed(seed_number);
+        m_random_seed = seed_number;
     }   // updateRandomSeed
+    // ------------------------------------------------------------------------
+    static uint32_t getRandomSeed()
+    {
+        return m_random_seed;
+    }   // getRandomSeed
+
     // ------------------------------------------------------------------------
 
     /** Disable item collection, useful to test client mispreditions or
diff --git a/src/scriptengine/script_track.cpp b/src/scriptengine/script_track.cpp
index 7b05e407d..3d6d4ceef 100644
--- a/src/scriptengine/script_track.cpp
+++ b/src/scriptengine/script_track.cpp
@@ -28,6 +28,7 @@
 #include "input/device_manager.hpp"
 #include "input/input_device.hpp"
 #include "input/input_manager.hpp"
+#include "items/item_manager.hpp"
 #include "modes/world.hpp"
 #include "scriptengine/property_animator.hpp"
 #include "scriptengine/aswrappedcall.hpp"
@@ -185,6 +186,11 @@ namespace Scripting
             return ::Track::getCurrentTrack()->getIsDuringDay();
         }
 
+        uint32_t getItemManagerRandomSeed()
+        {
+            return ItemManager::getRandomSeed();
+        }
+
         void setFog(float maxDensity, float start, float end, int r, int g, int b, float duration)
         {
             PropertyAnimator* animator = PropertyAnimator::get();
@@ -557,6 +563,10 @@ namespace Scripting
                                                mp ? WRAP_FN(getMajorRaceMode) : asFUNCTION(getMajorRaceMode), 
                                                call_conv); assert(r >= 0);
                                                
+            r = engine->RegisterGlobalFunction("uint getItemManagerRandomSeed()",
+                                               mp ? WRAP_FN(getItemManagerRandomSeed) : asFUNCTION(getItemManagerRandomSeed),
+                                               call_conv); assert(r >= 0);
+
             r = engine->RegisterGlobalFunction("int getMinorRaceMode()", 
                                                mp ? WRAP_FN(getMinorRaceMode) : asFUNCTION(getMinorRaceMode), 
                                                call_conv); assert(r >= 0);