do some random functions, ModelUtil, and move J3DModel to its proper location

include/Animation/BckCtrl.h

@@ -0,0 +1,20 @@
+#ifndef BCKCTRL_H
+#define BCKCTRL_H
+
+#include "types.h"
+
+class BckCtrlData
+{
+public:
+    BckCtrlData();
+
+    u32 _0;
+    s16 _4;
+    s16 _6;
+    s16 _8;
+    s16 _A;
+    s16 _C;
+    u16 _E;
+};
+
+#endif // BCKCTRL_H

include/MR/MathUtil.h

@@ -12,6 +12,11 @@ namespace MR
     bool isNearZero(const JGeometry::TVec3<f32> &, f32);
     f32 mod(f32, f32);
     void normalize(JGeometry::TVec3<f32> *);
+
+    f32 getRandom();
+    f32 getRandom(f32, f32);
+    f32 getRandom(s32, s32);
+    f32 getRandomDegree();
 };
 
 #endif // MATHUTIL_H

include/MR/ModelUtil.h

@@ -3,6 +3,7 @@
 
 #include "Actor/LiveActor/LiveActor.h"
 #include "Model/J3D/J3DModel.h"
+#include "OS/OSMutex.h"
 
 namespace MR
 {
@@ -10,6 +11,8 @@ namespace MR
     void calcAnimModelManager(LiveActor *);
     J3DModel* getJ3DModel(const LiveActor *);
     void calcJ3DModel(LiveActor *);
+    s16 getBckFrameMax(const LiveActor *, const char *);
+
     ResourceHolder* getResourceHolder(const LiveActor *);
     ResourceHolder* getModelResourceHolder(const LiveActor *);
 
@@ -18,6 +21,13 @@ namespace MR
     void syncJointAnimation(LiveActor *, const LiveActor *);
 
     void syncMaterialAnimation(LiveActor *, const LiveActor *);
+
+    template<int T>
+    class MutexHolder
+    {
+    public:
+        static OSMutex sMutex;
+    };
 }
 
 #endif // MODELUTIL_H

include/System/Resource/ResourceHolder.h

@@ -13,7 +13,8 @@ public:
     bool isExistMaterialAnim();
 
     ResTable* mResourceTable; // _0
-    u8 _4[0x38-0x4];
+    ResTable* _4;
+    u8 _8[0x38-0x8];
     u32 _38;
     u32 _3C;
     u32 _40;

source/MR/MathUtil.cpp

@@ -11,4 +11,15 @@ namespace MR
     {
         return (a2 + (a1 / a4) * (a3 - a2));
     }
+
+    f32 getRandom(f32 min, f32 max)
+    {
+        return min + ((max - min) * getRandom());
+    }
+
+    f32 getRandomDegree()
+    {
+        // todo -- figure out why 0.0f get omitted
+        return 0.0f + (360.0f * getRandom());
+    }
 };

source/MR/ModelUtil.cpp

@@ -1,4 +1,5 @@
 #include "MR/ModelUtil.h"
+#include "Animation/BckCtrl.h"
 
 namespace MR
 {
@@ -22,6 +23,13 @@ namespace MR
         return pActor->mModelManager->getJ3DModel();
     }
 
+    void calcJ3DModel(LiveActor *pActor)
+    {
+        OSLockMutex(&MR::MutexHolder<0>::sMutex);
+        MR::getJ3DModel(pActor)->calc();
+        OSUnlockMutex(&MR::MutexHolder<0>::sMutex);
+    }
+
     J3DModelData* getJ3DModelData(const LiveActor *pActor)
     {
         if (pActor->mModelManager == 0)
@@ -32,6 +40,12 @@ namespace MR
         return pActor->mModelManager->getJ3DModelData();
     }
 
+    s16 getBckFrameMax(const LiveActor *pActor, const char *pBck)
+    {
+        BckCtrlData* data = (BckCtrlData*)MR::getResourceHolder(pActor)->_4->getRes(pBck);
+        return data->_6;
+    }
+
     ResourceHolder* getResourceHolder(const LiveActor *pActor)
     {
         if (pActor->mModelManager != 0)