Use dynamic physics update rate above 120 FPS (#95)

Author: hyperbx

MarathonRecomp/CMakeLists.txt

@@ -138,6 +138,7 @@ set(MARATHON_RECOMP_PATCHES_CXX_SOURCES
     "patches/aspect_ratio_patches.cpp"
     "patches/audio_patches.cpp"
     "patches/camera_patches.cpp"
+    "patches/fps_patches.cpp"
     "patches/frontend_listener.cpp"
     "patches/misc_patches.cpp"
     "patches/player_patches.cpp"

MarathonRecomp/api/Marathon.h

@@ -56,6 +56,9 @@
 #include "Sonicteam/SoX/Engine/Task.h"
 #include "Sonicteam/SoX/MessageReceiver.h"
 #include "Sonicteam/SoX/Object.h"
+#include "Sonicteam/SoX/Physics/Havok/WorldHavok.h"
+#include "Sonicteam/SoX/Physics/World.h"
+#include "Sonicteam/SoX/RefCountObject.h"
 #include "Sonicteam/System/CreateStatic.h"
 #include "Sonicteam/System/Singleton.h"
 #include "Sonicteam/TitleTask.h"

MarathonRecomp/api/Sonicteam/GameImp.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <Marathon.inl>
+#include <Sonicteam/SoX/Physics/World.h>
 
 namespace Sonicteam
 {
@@ -29,5 +30,13 @@ namespace Sonicteam
 
         MARATHON_INSERT_PADDING(0xE3C);
         PlayerData m_PlayerData[4];
+        MARATHON_INSERT_PADDING(0xA4C);
+        xpointer<SoX::Physics::World> m_pPhysicsWorld;
+        xpointer<void> m_pMyCollisionFilter;
+
+        template <typename T>
+        inline T* GetPhysicsWorld();
     };
 }
+
+#include <Sonicteam/GameImp.inl>

MarathonRecomp/api/Sonicteam/GameImp.inl

@@ -0,0 +1,8 @@
+namespace Sonicteam
+{
+    template <typename T>
+    inline T* GameImp::GetPhysicsWorld()
+    {
+        return (T*)m_pPhysicsWorld.get();
+    }
+}

MarathonRecomp/api/Sonicteam/SoX/Physics/Havok/WorldHavok.h

@@ -0,0 +1,14 @@
+#pragma once
+
+#include <Marathon.inl>
+#include <Sonicteam/SoX/Physics/World.h>
+
+namespace Sonicteam::SoX::Physics::Havok
+{
+    class WorldHavok : public World
+    {
+    public:
+        MARATHON_INSERT_PADDING(0x18);
+        bool m_IsDynamicUpdateRate;
+    };
+}

MarathonRecomp/api/Sonicteam/SoX/Physics/World.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include <Marathon.inl>
+#include <Sonicteam/SoX/RefCountObject.h>
+
+namespace Sonicteam::SoX::Physics
+{
+    class World : public RefCountObject {};
+}

MarathonRecomp/api/Sonicteam/SoX/RefCountObject.h

@@ -0,0 +1,11 @@
+#pragma once
+
+namespace Sonicteam::SoX
+{
+    class RefCountObject
+    {
+    public:
+        xpointer<void> m_pVftable;
+        be<uint32_t> m_ReferenceCount;
+    };
+}

MarathonRecomp/patches/fps_patches.cpp

@@ -0,0 +1,14 @@
+#include <api/Marathon.h>
+#include <user/config.h>
+
+// Sonicteam::SoX::Physics::Havok::WorldHavok::Update
+PPC_FUNC_IMPL(__imp__sub_82587AA8);
+PPC_FUNC(sub_82587AA8)
+{
+    auto pPhysicsWorld = (Sonicteam::SoX::Physics::Havok::WorldHavok*)(base + ctx.r3.u32);
+
+    // Use dynamic update rate if the FPS exceeds the fixed rate.
+    pPhysicsWorld->m_IsDynamicUpdateRate = Config::FPS > 120;
+
+    __imp__sub_82587AA8(ctx, base);
+}