From aa267919ae42456e6dea158140f6c5e675aa0abc Mon Sep 17 00:00:00 2001
From: Paul <github@paulsapps.com>
Date: Wed, 7 Sep 2022 22:53:56 +0100
Subject: [PATCH] use AE rng seed in AO mixing both really drops a bomb on
 engine merging

---
 Source/AliveLibAE/Math.cpp         | 5 +++++
 Source/AliveLibAE/Math.hpp         | 2 ++
 Source/AliveLibAO/DemoPlayback.cpp | 4 +---
 Source/AliveLibAO/Math.cpp         | 5 -----
 4 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/Source/AliveLibAE/Math.cpp b/Source/AliveLibAE/Math.cpp
index f1dc04a00..be0200356 100644
--- a/Source/AliveLibAE/Math.cpp
+++ b/Source/AliveLibAE/Math.cpp
@@ -32,6 +32,11 @@ ALIVE_ARY(1, 0x546744, u8, 256, sRandomBytes_546744,
 
 ALIVE_VAR(1, 0x5D1E10, u8, sRandomSeed_5D1E10, 0);
 
+EXPORT void AE_SetRndSeed(u8 v)
+{
+    sRandomSeed_5D1E10 = v;
+}
+
 EXPORT u32 CC Math_FixedPoint_Multiply_496C50(s32 op1, s32 op2)
 {
     u32 op1a;   // ecx
diff --git a/Source/AliveLibAE/Math.hpp b/Source/AliveLibAE/Math.hpp
index 815507df4..bc3a1fd96 100644
--- a/Source/AliveLibAE/Math.hpp
+++ b/Source/AliveLibAE/Math.hpp
@@ -7,6 +7,8 @@ using FP = FixedPoint;
 
 void Math_ForceLink();
 
+EXPORT void AE_SetRndSeed(u8 v);
+
 EXPORT u32 CC Math_FixedPoint_Multiply_496C50(s32 op1, s32 op2);
 EXPORT u32 CC Math_FixedPoint_Divide_496B70(s32 op1, s32 op2);
 EXPORT s16 CC Math_RandomRange_496AB0(s16 min, s16 max);
diff --git a/Source/AliveLibAO/DemoPlayback.cpp b/Source/AliveLibAO/DemoPlayback.cpp
index 1fef1a10a..d0dfcdf26 100644
--- a/Source/AliveLibAO/DemoPlayback.cpp
+++ b/Source/AliveLibAO/DemoPlayback.cpp
@@ -12,8 +12,6 @@
 
 namespace AO {
 
-ALIVE_VAR_EXTERN(u8, sRandomSeed_50A228); //Math.cpp
-
 EXPORT DemoPlayback* DemoPlayback::ctor_4517B0(u8** ppPlaybackData, s16 bFromHandStone)
 {
     ctor_487E10(1);
@@ -41,7 +39,7 @@ EXPORT DemoPlayback* DemoPlayback::ctor_4517B0(u8** ppPlaybackData, s16 bFromHan
     auto pd = reinterpret_cast<PlaybackData*>(*ppPlaybackData);
     ResourceManager::Set_Header_Flags_4557D0(ppPlaybackData, ResourceManager::ResourceHeaderFlags::eLocked);
     SaveGame::LoadFromMemory_459970(&pd->saveData, 1);
-    sRandomSeed_50A228 = pd->randomSeed;
+    AE_SetRndSeed(pd->randomSeed);
     field_10_state = States::eState_0_Init;
     field_14_ppDemoRes = ppPlaybackData;
     field_8_update_delay = 1;
diff --git a/Source/AliveLibAO/Math.cpp b/Source/AliveLibAO/Math.cpp
index 6750079fe..cc0222393 100644
--- a/Source/AliveLibAO/Math.cpp
+++ b/Source/AliveLibAO/Math.cpp
@@ -29,14 +29,9 @@ ALIVE_ARY(1, 0x4BBE30, u8, 256, sRandomBytes_4BBE30,
 });
 // clang-format on
 
-ALIVE_VAR(1, 0x50A228, u8, sRandomSeed_50A228, 0);
 
 u8 Math_NextRandom()
 {
-    if (!RunningAsInjectedDll())
-    {
-        return sRandomBytes_4BBE30[sRandomSeed_50A228++];
-    }
     return ::Math_NextRandom(); // Ae ver
 }