D92: two truncated pointers on the chr/AI spawn path

(a) chrAllocate's 5th param was declared s32 but callers pass
ailistFindById()'s AIRecord* -- the 64-bit pointer was truncated before
reaching init_GUARDdata_with_set_values, so chr->ailist held a bogus
address and ai() faulted dereferencing (AiListp + Offset)->cmd on the
first AI tick. Param widened to AIListRecord* under PORT.

(b) Model.unka0 is a 32-bit field that on N64 holds a function pointer
(always sub_GAME_7F01FC10). chr.c stored (s32)sub_GAME_7F01FC10 into it
and model.c subcalcpos called it back -- truncated jump target on PC.
Widening the field would shift the rest of Model, so under PORT the
setter stores a flag and subcalcpos calls sub_GAME_7F01FC10 directly.

BUNKER1 now loads and ticks through to the first render, where it hits
D85 (room GDL/texture decode: 'Bad size for RGBA texture').

src/game/chr.c

@@ -1615,7 +1615,11 @@ PropRecord *init_GUARDdata_with_set_values(PropRecord *arg0, Model *arg1, struct
     arg0->pos.f[2] = arg2->f[2];
     arg0->stan = arg4;
 
+#ifdef PORT
+    sub_GAME_7F06FF5C(arg1, 1); /* D92: flag only; model.c subcalcpos calls sub_GAME_7F01FC10 directly */
+#else
     sub_GAME_7F06FF5C(arg1, (s32) sub_GAME_7F01FC10);
+#endif
 
     arg1->unk00 = 0xA;
     arg1->chr = var_s0;
@@ -1726,7 +1730,12 @@ PropRecord *init_GUARDdata_with_set_values(PropRecord *arg0, Model *arg1, struct
 /**
  * Address 0x7F0203B8.
  */
+#ifdef PORT
+/* D92: see chr.h -- arg4 must stay a pointer or the ailist is truncated. */
+PropRecord * chrAllocate( Model * arg0, coord3d * arg1, f32 arg2,  StandTile * arg3, struct AIListRecord *arg4)
+#else
 PropRecord * chrAllocate( Model * arg0, coord3d * arg1, f32 arg2,  StandTile * arg3, s32 arg4)
+#endif
 {
     PropRecord * ret;
     s32 phi_a0;

src/game/chr.h

@@ -268,7 +268,13 @@ void        chrSetMoving(ChrRecord *guard,s32 param_2);
 f32         getAnimationRate(void);
 void        setAnimationRate(f32);
 PropRecord *init_GUARDdata_with_set_values(PropRecord *, Model *, coord3d *, f32 arg2, StandTile * arg3, struct AIListRecord *arg4);
+#ifdef PORT
+/* D92: arg4 is an AIListRecord* (ailistFindById's return); declaring it s32
+ * truncates the 64-bit pointer on PC. */
+PropRecord *chrAllocate(struct Model * arg0, coord3d * arg1, f32 arg2, StandTile * arg3, struct AIListRecord *arg4);
+#else
 PropRecord *chrAllocate(struct Model * arg0, coord3d * arg1, f32 arg2, StandTile * arg3, s32 arg4);
+#endif
 void        chrSetHiddenToRandom(ChrRecord *arg0);
 void        chrRemoved7F022E1C(f32 arg0);
 void        chrDecrementAnimationTablePointerCount(void);

src/game/model.c

@@ -1187,10 +1187,22 @@ void sub_GAME_7F06D490(Model *model, ModelNode *modelNode)
     sp2c.y = sp38.y;
     sp2c.z = sp38.z;
 
+#ifdef PORT
+    /* D92: `unka0` is a 32-bit Model field that on N64 holds a function
+     * pointer -- always sub_GAME_7F01FC10 (the only value chr.c ever hands
+     * the setter). Widening the field would shift the rest of Model, so on
+     * PC the setter stores a nonzero flag and the single indirect call is
+     * made directly here. */
+    if (model->unka0 && !sub_GAME_7F01FC10(model, &rw->Header.pos, &sp2c, &rw->Header.ground))
+    {
+        return;
+    }
+#else
     if (model->unka0 && !((s32 (*)(Model *, coord3d *, coord3d *, f32 *)) model->unka0)(model, &rw->Header.pos, &sp2c, &rw->Header.ground))
     {
         return;
     }
+#endif
 
     sp38.x = sp2c.x - sp38.x;
     sp38.z = sp2c.z - sp38.z;