m_shadow improvements

include/m/m3d/m_shadow.h

@@ -189,7 +189,7 @@ public:
     virtual int getType() const override;
     /* 0x24 */ virtual void draw(const mMtx_c &);
 
-    void calc(mMtx_c, mMtx_c &);
+    void calc(mMtx_c, mMtx_c &) const;
 
     /* 0x18 */ mMtx_c mMtx;
     /* 0x48 */ f32 field_0x48;

include/m/m_mtx.h

@@ -6,6 +6,7 @@
 #include "common.h"
 #include "egg/math/eggMatrix.h"
 #include "m/m_angle.h"
+#include "m/m_quat.h"
 #include "m/m_vec.h"
 #include "nw4r/types_nw4r.h"
 #include "rvl/MTX/mtx.h"
@@ -82,6 +83,10 @@ public:
         return *this;
     }
 
+    void applyQuat(mQuat_c &quat) {
+        PSMTXMultVec(m, quat.v, quat.v);
+    }
+
 public:
     static mMtx_c Identity;
 };

include/m/m_quat.h

@@ -8,12 +8,20 @@ class mQuat_c : public EGG::Quatf {
 public:
     mQuat_c() {}
     mQuat_c(f32 x, f32 y, f32 z, f32 w) : EGG::Quatf(w, x, y, z) {}
+    mQuat_c(const mQuat_c &other) : EGG::Quatf(other.w, other.v) {}
+
     mQuat_c &operator=(const EGG::Quatf &rhs) {
         v = rhs.v;
         w = rhs.w;
         return *this;
     }
 
+    mQuat_c &operator=(const mQuat_c &rhs) {
+        v = rhs.v;
+        w = rhs.w;
+        return *this;
+    }
+
     bool Set(const mVec3_c &, const mVec3_c &);
     void fn_802F2780(const mQuat_c &other);
     bool fn_802F2450(const mVec3_c &, const mVec3_c &, f32);