process class inheritance vtable fix

include/f_pc/f_pc_base.h

@@ -20,7 +20,7 @@ typedef struct state_class {
 } state_class;
 
 typedef struct base_process_class {
-    /* 0x00 */ int type;
+    /* 0x00 */ int type; // DUSK NOTE: fopAcM_ct_placement relies on this being the *very* first field!
     /* 0x04 */ fpc_ProcID id;
     /* 0x08 */ s16 name;
     /* 0x0A */ s8 unk_0xA;
@@ -37,6 +37,14 @@ typedef struct base_process_class {
     /* 0xAC */ void* append;
     /* 0xB0 */ u32 parameters;
     /* 0xB4 */ int subtype;
+#if !__MWERKS__
+    // MSVC places vtables at the start of a class, *even* if that class inherits from something
+    // without vtable. This breaks everything.
+    // TO avoid issues with pointer casting, we make base_process_class also have a vtable and
+    // ensure we're using inheritance on it.
+
+    virtual ~base_process_class();
+#endif
 } base_process_class;  // Size: 0xB8
 
 BOOL fpcBs_Is_JustOfType(int i_typeA, int i_typeB);

include/f_pc/f_pc_leaf.h

@@ -13,8 +13,16 @@ typedef struct leafdraw_method_class {
     /* 0x10 */ process_method_func draw_method;
 } leafdraw_method_class;
 
+#if __MWERKS__
+#define LEAFDRAW_BASE(val) (val)->base
+
 typedef struct leafdraw_class {
     /* 0x00 */ base_process_class base;
+#else
+#define LEAFDRAW_BASE(val) (*(base_process_class*)val)
+
+typedef struct leafdraw_class : base_process_class {
+#endif
     /* 0xB8 */ leafdraw_method_class* leaf_methods;
     /* 0xBC */ s8 unk_0xBC;
     /* 0xBD */ u8 unk_0xBD;