From fddb4abd534ef1ef623cb044bc97c45713fbcfd1 Mon Sep 17 00:00:00 2001
From: theo3 <arisstephenson2@gmail.com>
Date: Thu, 11 Nov 2021 21:18:48 -0800
Subject: [PATCH] move entity update functions

---
 Makefile                |  11 ++-
 data/data_080B3740.s    |  28 -------
 include/entity.h        |  36 +++++----
 include/gba/m4a.h       |   2 +
 include/screen.h        |  36 ++++-----
 linker.ld               |   6 ++
 src/collision.c         |  95 ++++++++++++++++-------
 src/debugScreen.c       |  22 +++---
 src/demoScreen.c        |  12 +--
 src/enemy/waterDrop.c   |   8 +-
 src/fade.c              |   6 +-
 src/fileScreen.c        |  28 +++----
 src/game.c              |   2 +-
 src/interrupts.c        | 162 ++++------------------------------------
 src/intro.c             |  24 +++---
 src/manager.c           |   5 ++
 src/manager/manager1.c  |   4 +-
 src/manager/manager10.c |   6 +-
 src/manager/manager15.c |  28 +++----
 src/manager/manager18.c |  10 +--
 src/manager/manager19.c |  10 +--
 src/manager/manager1A.c |  10 +--
 src/manager/manager1B.c |  14 ++--
 src/manager/manager1D.c |  14 ++--
 src/manager/manager2.c  |  48 ++++++------
 src/manager/manager2F.c |  10 +--
 src/manager/manager32.c |   8 +-
 src/manager/manager39.c |   4 +-
 src/manager/manager8.c  |  40 +++++-----
 src/manager/manager9.c  |  14 ++--
 src/manager/managerC.c  |   8 +-
 src/npc.c               |  34 +++++++++
 src/npc/bigGoron.c      |   6 +-
 src/npc/phonograph.c    |   2 +-
 src/object.c            |  15 ++++
 src/playerItem.c        |  65 +++++++++++++++-
 src/sub_080A3B84.c      |  12 +--
 37 files changed, 430 insertions(+), 415 deletions(-)

diff --git a/Makefile b/Makefile
index c2f9fd4f..c7e9c767 100644
--- a/Makefile
+++ b/Makefile
@@ -110,9 +110,14 @@ else
 NODEP := 1
 endif
 
-#$(C_BUILDDIR)/need_interworking_file_name.o: CFLAGS += -mthumb-interwork
-$(C_BUILDDIR)/interrupts.o: CFLAGS += -mthumb-interwork
-$(C_BUILDDIR)/collision.o: CFLAGS += -mthumb-interwork
+interwork := $(C_BUILDDIR)/interrupts.o \
+$(C_BUILDDIR)/collision.o \
+$(C_BUILDDIR)/playerItem.o \
+$(C_BUILDDIR)/object.o \
+$(C_BUILDDIR)/manager.o \
+$(C_BUILDDIR)/npc.o
+
+$(interwork): CFLAGS += -mthumb-interwork
 $(C_BUILDDIR)/gba/m4a.o: CFLAGS = -O2 -mthumb-interwork -Wimplicit -Wparentheses -Werror -Wno-multichar
 $(C_BUILDDIR)/eeprom.o: CFLAGS = -O1 -mthumb-interwork -Wimplicit -Wparentheses -Werror -Wno-multichar
 
diff --git a/data/data_080B3740.s b/data/data_080B3740.s
index 7eadfad5..02a11b4e 100644
--- a/data/data_080B3740.s
+++ b/data/data_080B3740.s
@@ -4,34 +4,6 @@
 	.section .rodata
 	.align 2
 
-gUnk_080B3740:: @ 080B3740
-	.incbin "baserom.gba", 0x0B3740, 0x0000004
-
-gUnk_080B3744:: @ 080B3744
-	.4byte sub_08018308
-	.4byte CollisionNoOp
-	.4byte CollisionNoOp
-	.4byte CollisionGroundItem
-	.4byte sub_08017B58
-	.4byte sub_08017EB0
-	.4byte sub_08017F3C
-	.4byte sub_08017F40
-	.4byte sub_0801802C
-	.4byte sub_08017DD4
-	.4byte sub_080180E8
-	.4byte sub_08017BBC
-	.4byte sub_08017C40
-	.4byte sub_08017D6C
-	.4byte sub_08017D28
-	.4byte sub_08018168
-	.4byte sub_08018228
-	.4byte sub_08018250
-	.4byte sub_08018288
-	.4byte sub_080182A8
-	.4byte sub_08017B1C
-	.4byte sub_08017CBC
-	.4byte sub_08017E88
-
 gUnk_080B37A0:: @ 080B37A0
 .ifdef EU
     @ TODO only small differences
diff --git a/include/entity.h b/include/entity.h
index b6793df1..96735a0d 100644
--- a/include/entity.h
+++ b/include/entity.h
@@ -209,23 +209,29 @@ enum {
 #define Direction8FromAnimationState(expr) (((expr) << 2)
 
 Entity* GetEmptyEntity(void);
-extern Entity* CreateEnemy(u32 id, u32 type);
-extern Entity* CreateNPC(u32 id, u32 type, u32 type2);
-extern Entity* CreateObject(u32 id, u32 type, u32 type2);
-extern Entity* CreateObjectWithParent(Entity* parent, u32 id, u32 type, u32 type2);
-extern Entity* CreateFx(Entity* parent, u32 type, u32 type2);
+void DrawEntity(Entity*);
+Entity* CreateEnemy(u32 id, u32 type);
+Entity* CreateNPC(u32 id, u32 type, u32 type2);
+Entity* CreateObject(u32 id, u32 type, u32 type2);
+Entity* CreateObjectWithParent(Entity* parent, u32 id, u32 type, u32 type2);
+Entity* CreateFx(Entity* parent, u32 type, u32 type2);
 
-extern void InitializeAnimation(Entity*, u32);
-extern void InitAnimationForceUpdate(Entity*, u32);
-extern void UpdateAnimationSingleFrame(Entity*);
-extern void UpdateSpriteForCollisionLayer(Entity*);
-extern void GetNextFrame(Entity*);
-extern u32 LoadExtraSpriteData(Entity*, SpriteLoadData*);
-extern void SetExtraSpriteFrame(Entity*, u32, u32);
-extern void SetSpriteSubEntryOffsetData1(Entity*, u32, u32);
-extern void SetSpriteSubEntryOffsetData2(Entity*, u32, u32);
+void InitializeAnimation(Entity*, u32);
+void InitAnimationForceUpdate(Entity*, u32);
+void UpdateAnimationSingleFrame(Entity*);
+void UpdateSpriteForCollisionLayer(Entity*);
+void GetNextFrame(Entity*);
+u32 LoadExtraSpriteData(Entity*, SpriteLoadData*);
+void SetExtraSpriteFrame(Entity*, u32, u32);
+void SetSpriteSubEntryOffsetData1(Entity*, u32, u32);
+void SetSpriteSubEntryOffsetData2(Entity*, u32, u32);
 
-extern u32 GetFacingDirection(Entity*, Entity*);
+u32 GetFacingDirection(Entity*, Entity*);
+
+/**
+ * @brief Check if entity should sleep this frame.
+ */
+bool32 CheckDontUpdate(Entity* this);
 
 /**
  * @brief Delete the entity currently in execution.
diff --git a/include/gba/m4a.h b/include/gba/m4a.h
index 0dcbd822..7b6a345e 100644
--- a/include/gba/m4a.h
+++ b/include/gba/m4a.h
@@ -173,6 +173,8 @@ typedef struct MusicPlayer {
 extern const MusicPlayer gMusicPlayers[];
 extern const Song gSongTable[];
 
+void m4aSoundMain(void);
+void m4aSoundVSync(void);
 void m4aSoundInit(void);
 void m4aSongNumStart(u16 n);
 void m4aSongNumStartOrContinue(u16 n);
diff --git a/include/screen.h b/include/screen.h
index e6462de1..12c30c57 100644
--- a/include/screen.h
+++ b/include/screen.h
@@ -11,29 +11,19 @@ typedef struct {
 } LcdControls;
 
 typedef struct {
-    u16 bg0Control;
-    u16 bg0xOffset;
-    u16 bg0yOffset;
-    u16 bg0Updated;
-    void* bg0Tilemap;
-    u16 bg1Control;
-    u16 bg1xOffset;
-    u16 bg1yOffset;
-    u16 bg1Updated;
-    void* bg1Tilemap;
+    u16 control;
+    u16 xOffset;
+    u16 yOffset;
+    u16 updated;
+    void* tilemap;
 } BgSettings;
 
 typedef struct {
-    u16 bg2Control;
-    u16 bg2xOffset;
-    u16 bg2yOffset;
-    u16 bg2Updated;
-    void* bg2Tilemap;
-    u16 bg3Control;
-    s16 bg3xOffset;
-    s16 bg3yOffset;
-    u16 bg3Updated;
-    void* bg3Tilemap;
+    u16 control;
+    s16 xOffset;
+    s16 yOffset;
+    u16 updated;
+    void* tilemap;
 } BgAffSettings;
 
 typedef struct {
@@ -67,8 +57,10 @@ typedef struct {
 
 typedef struct {
     /*0x00*/ LcdControls lcd;
-    /*0x08*/ BgSettings bg;
-    /*0x20*/ BgAffSettings affine;
+    /*0x08*/ BgSettings bg0;
+    /*0x14*/ BgSettings bg1;
+    /*0x20*/ BgAffSettings bg2;
+    /*0x2c*/ BgAffSettings bg3;
     /*0x38*/ BgControls controls;
     /*0x6c*/ u8 _6c;
     /*0x6d*/ u8 _6d;
diff --git a/linker.ld b/linker.ld
index 284ad05c..03bde6bf 100644
--- a/linker.ld
+++ b/linker.ld
@@ -332,6 +332,10 @@ SECTIONS {
 
         /* C source compiled with interworking */
         src/interrupts.o(.text);
+        src/playerItem.o(.text);
+        src/object.o(.text);
+        src/manager.o(.text);
+        src/npc.o(.text);
         src/collision.o(.text);
         /* C source compiled without interworking */
         asm/code_08018500.o(.text);
@@ -972,10 +976,12 @@ SECTIONS {
         asm/intr.o(.text);
         /* data */
         data/data_080B2A70.o(.rodata);
+        src/interrupts.o(.rodata);
         src/playerItem.o(.rodata);
         src/object.o(.rodata);
         src/manager.o(.rodata);
         src/npc.o(.rodata);
+        src/collision.o(.rodata);
         data/data_080B3740.o(.rodata);
         data/const/playerItem/playerItem11.o(.rodata);
         data/const/playerItem/playerItemBow.o(.rodata);
diff --git a/src/collision.c b/src/collision.c
index 9c0309c7..3a023bda 100644
--- a/src/collision.c
+++ b/src/collision.c
@@ -274,7 +274,7 @@ void sub_08017940(Entity* org, Entity* tgt) {
     r1 = 0;
 
     r1 = (u32)(org == &gPlayerEntity ? gPlayerEntity.knockbackDuration
-                                   : (tgt == &gPlayerEntity ? tgt->knockbackDuration : 0)) >>
+                                     : (tgt == &gPlayerEntity ? tgt->knockbackDuration : 0)) >>
          3;
 
     // Anything requiring the evaluation of r1 could be written here.
@@ -284,7 +284,7 @@ void sub_08017940(Entity* org, Entity* tgt) {
 }
 
 void sub_080179EC(Entity* a1, Entity* a2) {
-    u8* p = gUnk_080B3740;
+    const u8* p = (const u8[]){ FX_27, FX_32, FX_33, FX_34 };
     u32 rand = Random();
     Entity* e = CreateFx(a2, p[rand & 3], 0);
     if (e != NULL) {
@@ -310,13 +310,44 @@ Entity* sub_08017A90(Entity* a1, Entity* parent) {
     return NULL;
 }
 
-u32 CollisionNoOp(Entity* org, Entity* tgt, u32 direction) {
+typedef s32 (*CollisionHandler)(Entity* org, Entity* tgt, u32 direction, ColSettings* settings);
+s32 sub_08018308(Entity* org, Entity* tgt, u32 direction, ColSettings* settings);
+s32 CollisionNoOp(Entity* org, Entity* tgt, u32 direction, ColSettings* settings);
+s32 CollisionGroundItem(Entity* org, Entity* tgt, u32 direction, ColSettings* settings);
+s32 sub_08017B58(Entity* org, Entity* tgt, u32 direction, ColSettings* settings);
+s32 sub_08017EB0(Entity* org, Entity* tgt, u32 direction, ColSettings* settings);
+s32 sub_08017F3C(Entity* org, Entity* tgt, u32 direction, ColSettings* settings);
+s32 sub_08017F40(Entity* org, Entity* tgt, u32 direction, ColSettings* settings);
+s32 sub_0801802C(Entity* org, Entity* tgt, u32 direction, ColSettings* settings);
+s32 sub_08017DD4(Entity* org, Entity* tgt, u32 direction, ColSettings* settings);
+s32 sub_080180E8(Entity* org, Entity* tgt, u32 direction, ColSettings* settings);
+s32 sub_08017BBC(Entity* org, Entity* tgt, u32 direction, ColSettings* settings);
+s32 sub_08017C40(Entity* org, Entity* tgt, u32 direction, ColSettings* settings);
+s32 sub_08017D6C(Entity* org, Entity* tgt, u32 direction, ColSettings* settings);
+s32 sub_08017D28(Entity* org, Entity* tgt, u32 direction, ColSettings* settings);
+s32 sub_08018168(Entity* org, Entity* tgt, u32 direction, ColSettings* settings);
+s32 sub_08018228(Entity* org, Entity* tgt, u32 direction, ColSettings* settings);
+s32 sub_08018250(Entity* org, Entity* tgt, u32 direction, ColSettings* settings);
+s32 sub_08018288(Entity* org, Entity* tgt, u32 direction, ColSettings* settings);
+s32 sub_080182A8(Entity* org, Entity* tgt, u32 direction, ColSettings* settings);
+s32 sub_08017B1C(Entity* org, Entity* tgt, u32 direction, ColSettings* settings);
+s32 sub_08017CBC(Entity* org, Entity* tgt, u32 direction, ColSettings* settings);
+s32 sub_08017E88(Entity* org, Entity* tgt, u32 direction, ColSettings* settings);
+
+const CollisionHandler gUnk_080B3744[] = {
+    sub_08018308, CollisionNoOp, CollisionNoOp, CollisionGroundItem, sub_08017B58, sub_08017EB0,
+    sub_08017F3C, sub_08017F40,  sub_0801802C,  sub_08017DD4,        sub_080180E8, sub_08017BBC,
+    sub_08017C40, sub_08017D6C,  sub_08017D28,  sub_08018168,        sub_08018228, sub_08018250,
+    sub_08018288, sub_080182A8,  sub_08017B1C,  sub_08017CBC,        sub_08017E88,
+};
+
+s32 CollisionNoOp(Entity* org, Entity* tgt, u32 direction, ColSettings* settings) {
     return 0;
 }
 
 // origin: player or sword
 // target: item
-s32 CollisionGroundItem(Entity* org, Entity* tgt, u32 direction) {
+s32 CollisionGroundItem(Entity* org, Entity* tgt, u32 direction, ColSettings* settings) {
     COLLISION_OFF(tgt);
     tgt->bitfield = org->hurtType | 0x80;
     if ((tgt->type == 0x5F || tgt->type == 0x60) && sub_08081420(tgt))
@@ -324,7 +355,7 @@ s32 CollisionGroundItem(Entity* org, Entity* tgt, u32 direction) {
     return 2;
 }
 
-s32 sub_08017B1C(Entity* org, Entity* tgt, u32 direction) {
+s32 sub_08017B1C(Entity* org, Entity* tgt, u32 direction, ColSettings* settings) {
     if ((gPlayerState.field_0x1d[1] & 0x60) != 0) {
         COLLISION_OFF(tgt);
     } else {
@@ -335,7 +366,7 @@ s32 sub_08017B1C(Entity* org, Entity* tgt, u32 direction) {
     return 1;
 }
 
-s32 sub_08017B58(Entity* org, Entity* tgt, u32 direction) {
+s32 sub_08017B58(Entity* org, Entity* tgt, u32 direction, ColSettings* settings) {
     if ((tgt->field_0x3a & 4) != 0) {
         if (tgt->field_0x1d) {
             s32 x = tgt->field_0x1d = tgt->field_0x1d - gPlayerState.field_0x1d[0];
@@ -354,7 +385,7 @@ s32 sub_08017B58(Entity* org, Entity* tgt, u32 direction) {
     return 1;
 }
 
-s32 sub_08017BBC(Entity* org, Entity* tgt, u32 direction) {
+s32 sub_08017BBC(Entity* org, Entity* tgt, u32 direction, ColSettings* settings) {
     if ((gPlayerState.flags & (0x1 | 0x80 | 0x400 | 0x1000)) == 0) {
         Entity* e = CreateObject(66, 1, 0);
         if (e != NULL) {
@@ -373,7 +404,7 @@ s32 sub_08017BBC(Entity* org, Entity* tgt, u32 direction) {
     return 1;
 }
 
-s32 sub_08017C40(Entity* org, Entity* tgt, u32 direction) {
+s32 sub_08017C40(Entity* org, Entity* tgt, u32 direction, ColSettings* settings) {
     if ((gPlayerState.flags & (0x1 | 0x80 | 0x800 | 0x1000)) == 0 && gPlayerState.playerAction == 0) {
         if (org->action == 1 || org->action == 24) {
             tgt->damage = 4;
@@ -390,7 +421,8 @@ s32 sub_08017C40(Entity* org, Entity* tgt, u32 direction) {
     return 1;
 }
 
-NONMATCH("asm/non_matching/collision/sub_08017CBC.inc", s32 sub_08017CBC(Entity* org, Entity* tgt, u32 direction)) {
+NONMATCH("asm/non_matching/collision/sub_08017CBC.inc",
+         s32 sub_08017CBC(Entity* org, Entity* tgt, u32 direction, ColSettings* settings)) {
     if (((-(((direction ^ 0x10) - 0xc) & 0x1f) + tgt->direction) & 0x1f) < 0x19) {
         org->iframes = -12;
         tgt->iframes = -12;
@@ -407,7 +439,7 @@ NONMATCH("asm/non_matching/collision/sub_08017CBC.inc", s32 sub_08017CBC(Entity*
 }
 END_NONMATCH
 
-s32 sub_08017D28(Entity* org, Entity* tgt, u32 direction) {
+s32 sub_08017D28(Entity* org, Entity* tgt, u32 direction, ColSettings* settings) {
     gPlayerState.field_0x1a[0] = 1;
     org->field_0x7a.HWORD = 600;
     org->knockbackDuration = 12;
@@ -418,7 +450,7 @@ s32 sub_08017D28(Entity* org, Entity* tgt, u32 direction) {
     return 1;
 }
 
-s32 sub_08017D6C(Entity* org, Entity* tgt, u32 direction) {
+s32 sub_08017D6C(Entity* org, Entity* tgt, u32 direction, ColSettings* settings) {
     u32 x;
     u32 y;
     ColSettings* p;
@@ -436,7 +468,7 @@ s32 sub_08017D6C(Entity* org, Entity* tgt, u32 direction) {
     return sub_08018308(org, tgt, direction, p);
 }
 
-int sub_08017DD4(Entity* org, Entity* tgt, u32 direction) {
+int sub_08017DD4(Entity* org, Entity* tgt, u32 direction, ColSettings* settings) {
     org->bitfield = 0;
     if (tgt->damage & 0x80)
         tgt->damage &= ~0x80;
@@ -459,7 +491,7 @@ int sub_08017DD4(Entity* org, Entity* tgt, u32 direction) {
     return 1;
 }
 
-s32 sub_08017E88(Entity* org, Entity* tgt, u32 direction) {
+s32 sub_08017E88(Entity* org, Entity* tgt, u32 direction, ColSettings* settings) {
     org->knockbackDuration = 2;
     org->field_0x46 = 640;
     if (tgt->iframes == 0)
@@ -467,7 +499,7 @@ s32 sub_08017E88(Entity* org, Entity* tgt, u32 direction) {
     return 1;
 }
 
-s32 sub_08017EB0(Entity* org, Entity* tgt, u32 direction) {
+s32 sub_08017EB0(Entity* org, Entity* tgt, u32 direction, ColSettings* settings) {
     if (tgt->damage == 0)
         return 0;
     if (org == &gPlayerEntity) {
@@ -489,14 +521,20 @@ s32 sub_08017EB0(Entity* org, Entity* tgt, u32 direction) {
     return 1;
 }
 
-s32 sub_08017F3C(Entity* org, Entity* tgt, u32 direction) {
+s32 sub_08017F3C(Entity* org, Entity* tgt, u32 direction, ColSettings* settings) {
     return 1;
 }
 
-s32 sub_08017F40(Entity* org, Entity* tgt, u32 direction) {
+s32 sub_08017F40(Entity* org, Entity* tgt, u32 direction, ColSettings* settings) {
     if (tgt->field_0x43 == 0) {
         if (org == &gPlayerEntity) {
-            if (sub_08079F8C() && (gPlayerState.flags & 0x80) == 0 && !gPlayerState.swimState) {
+            if (sub_08079F8C() &&
+#ifdef EU
+                (gPlayerState.flags & 0x81) == 0 &&
+#else
+                (gPlayerState.flags & 0x80) == 0 &&
+#endif
+                !gPlayerState.swimState) {
                 gPlayerState.field_0x1a[0] |= 0x80u;
                 gPlayerState.field_0xa |= 0x80u;
                 gPlayerState.flags |= 0x10u;
@@ -525,7 +563,8 @@ s32 sub_08017F40(Entity* org, Entity* tgt, u32 direction) {
 }
 
 // inverted branch
-NONMATCH("asm/non_matching/collision/sub_0801802C.inc", s32 sub_0801802C(Entity* org, Entity* tgt, u32 direction)) {
+NONMATCH("asm/non_matching/collision/sub_0801802C.inc",
+         s32 sub_0801802C(Entity* org, Entity* tgt, u32 direction, ColSettings* settings)) {
     int kind;
     ColSettings* p;
     u32 x;
@@ -558,7 +597,7 @@ void sub_080180BC(Entity* org, Entity* tgt) {
     tgt->subAction = -1;
 }
 
-s32 sub_080180E8(Entity* org, Entity* tgt, u32 direction) {
+s32 sub_080180E8(Entity* org, Entity* tgt, u32 direction, ColSettings* settings) {
     u32 v3;
     u32 x;
 
@@ -577,10 +616,16 @@ s32 sub_080180E8(Entity* org, Entity* tgt, u32 direction) {
     return sub_08018308(org, tgt, v3, &gCollisionMtx[org->hurtType + x]);
 }
 
-s32 sub_08018168(Entity* org, Entity* tgt, u32 direction) {
+s32 sub_08018168(Entity* org, Entity* tgt, u32 direction, ColSettings* settings) {
     if (tgt->field_0x43 == 0) {
         if (org == &gPlayerEntity) {
-            if (((sub_08079F8C() != 0) && ((gPlayerState.flags & 0x40080) == 0)) && (gPlayerState.swimState == 0)) {
+            if (((sub_08079F8C() != 0) &&
+#ifdef EU
+                 ((gPlayerState.flags & 0x81) == 0)) &&
+#else
+                 ((gPlayerState.flags & 0x40080) == 0)) &&
+#endif
+                (gPlayerState.swimState == 0)) {
                 gPlayerState.field_0x1a[0] |= 0x80;
                 gPlayerState.field_0xa |= 0x80;
                 gPlayerState.flags |= 0x100;
@@ -602,13 +647,13 @@ s32 sub_08018168(Entity* org, Entity* tgt, u32 direction) {
     return 0;
 }
 
-s32 sub_08018228(Entity* org, Entity* tgt, u32 direction) {
+s32 sub_08018228(Entity* org, Entity* tgt, u32 direction, ColSettings* settings) {
     if (org == &gPlayerEntity && sub_08079F8C())
         sub_08004484(tgt, org);
     return 0;
 }
 
-s32 sub_08018250(Entity* org, Entity* tgt, u32 direction) {
+s32 sub_08018250(Entity* org, Entity* tgt, u32 direction, ColSettings* settings) {
     org->iframes = -1;
     if (org->direction == 0) {
         tgt->iframes = 16;
@@ -619,7 +664,7 @@ s32 sub_08018250(Entity* org, Entity* tgt, u32 direction) {
     return 1;
 }
 
-s32 sub_08018288(Entity* org, Entity* tgt, u32 direction) {
+s32 sub_08018288(Entity* org, Entity* tgt, u32 direction, ColSettings* settings) {
     if (org == &gPlayerEntity)
         sub_0807AFE8();
     else
@@ -627,7 +672,7 @@ s32 sub_08018288(Entity* org, Entity* tgt, u32 direction) {
     return 1;
 }
 
-s32 sub_080182A8(Entity* org, Entity* tgt, u32 direction) {
+s32 sub_080182A8(Entity* org, Entity* tgt, u32 direction, ColSettings* settings) {
     if (tgt->field_0x43 == 0) {
         if (org->iframes == 0)
             org->iframes = -1;
diff --git a/src/debugScreen.c b/src/debugScreen.c
index 9e290ae2..c34abe12 100644
--- a/src/debugScreen.c
+++ b/src/debugScreen.c
@@ -18,12 +18,12 @@ void sub_0805FA04(void) {
     MemClear(&gBG0Buffer, sizeof(gBG0Buffer));
     MemClear(&gBG3Buffer, sizeof(gBG3Buffer));
     gScreen.lcd.displayControl = 0x940;
-    gScreen.bg.bg0xOffset = 0;
-    gScreen.bg.bg0yOffset = 0;
-    gScreen.affine.bg3xOffset = 0;
-    gScreen.affine.bg3yOffset = 0;
-    gScreen.affine.bg3Control = 0x1e0f;
-    gScreen.affine.bg3Updated = 1;
+    gScreen.bg0.xOffset = 0;
+    gScreen.bg0.yOffset = 0;
+    gScreen.bg3.xOffset = 0;
+    gScreen.bg3.yOffset = 0;
+    gScreen.bg3.control = 0x1e0f;
+    gScreen.bg3.updated = 1;
     MessageInitialize();
     MemClear((void*)&gUnk_02032EC0, sizeof(UI));
     MemClear((void*)&gMenu, sizeof(Menu));
@@ -48,11 +48,11 @@ void sub_0805FA98(void) {
         case 0x200:
             gMenu.focusCoords[0] ^= 1;
             if (gMenu.focusCoords[0] == 0) {
-                gScreen.bg.bg0Control = 0x1f0c;
-                gScreen.affine.bg3Control = 0x1e0f;
+                gScreen.bg0.control = 0x1f0c;
+                gScreen.bg3.control = 0x1e0f;
             } else {
-                gScreen.bg.bg0Control = 0x1f0f;
-                gScreen.affine.bg3Control = 0x1e0c;
+                gScreen.bg0.control = 0x1f0f;
+                gScreen.bg3.control = 0x1e0c;
             }
             break;
         case 0x100:
@@ -87,7 +87,7 @@ void sub_0805FA98(void) {
             }
     }
     gMenu.focusCoords[1] = (gMenu.focusCoords[1] + 3) % 3;
-    gScreen.affine.bg3Updated = 1;
+    gScreen.bg3.updated = 1;
 }
 
 void sub_0805FBC4() {
diff --git a/src/demoScreen.c b/src/demoScreen.c
index 50ded088..b2620204 100644
--- a/src/demoScreen.c
+++ b/src/demoScreen.c
@@ -49,12 +49,12 @@ void sub_080A2E40(void) {
     MemCopy(&gUnk_08A05751, &gBG1Buffer, 0x800);
     MemCopy(&gUnk_08A05751[0x800], &gBG2Buffer, 0x800);
     gScreen.lcd.displayControl = 0x1f00;
-    gScreen.bg.bg1Control = 0x1c81;
-    gScreen.affine.bg2Control = 0x1d82;
-    gScreen.affine.bg3Control = 0x1e0b;
-    gScreen.bg.bg1Updated = 1;
-    gScreen.affine.bg2Updated = 1;
-    gScreen.affine.bg3Updated = 1;
+    gScreen.bg1.control = 0x1c81;
+    gScreen.bg2.control = 0x1d82;
+    gScreen.bg3.control = 0x1e0b;
+    gScreen.bg1.updated = 1;
+    gScreen.bg2.updated = 1;
+    gScreen.bg3.updated = 1;
     gScreen.controls.layerFXControl = 0x1044;
     gScreen.controls.alphaBlend = 0xb04;
     {
diff --git a/src/enemy/waterDrop.c b/src/enemy/waterDrop.c
index 0625569c..d32ae94e 100644
--- a/src/enemy/waterDrop.c
+++ b/src/enemy/waterDrop.c
@@ -62,8 +62,8 @@ void sub_0802A2FC(Entity* this) {
 }
 
 void sub_0802A334(Entity* this) {
-    u32 x = (this->x.HALF.HI - gRoomControls.roomScrollX + gScreen.bg.bg1xOffset) >> 3;
-    u32 y = (this->y.HALF.HI - gRoomControls.roomScrollY + gScreen.bg.bg1yOffset) >> 3;
+    u32 x = (this->x.HALF.HI - gRoomControls.roomScrollX + gScreen.bg1.xOffset) >> 3;
+    u32 y = (this->y.HALF.HI - gRoomControls.roomScrollY + gScreen.bg1.yOffset) >> 3;
     if (gBG3Buffer[(x & 0x1fU) + (y & 0x1fU) * 0x20 + 0x400]) {
         this->collisionLayer = 2;
     } else {
@@ -73,8 +73,8 @@ void sub_0802A334(Entity* this) {
 }
 
 void sub_0802A39C(Entity* this) {
-    u32 x = (gPlayerEntity.x.HALF.HI - gRoomControls.roomScrollX + gScreen.bg.bg1xOffset) >> 3;
-    u32 y = (gPlayerEntity.y.HALF.HI - gRoomControls.roomScrollY + gScreen.bg.bg1yOffset - 10) >> 3;
+    u32 x = (gPlayerEntity.x.HALF.HI - gRoomControls.roomScrollX + gScreen.bg1.xOffset) >> 3;
+    u32 y = (gPlayerEntity.y.HALF.HI - gRoomControls.roomScrollY + gScreen.bg1.yOffset - 10) >> 3;
     if (gBG3Buffer[(x & 0x1fU) + (y & 0x1fU) * 0x20 + 0x400]) {
         COLLISION_OFF(this);
     } else {
diff --git a/src/fade.c b/src/fade.c
index fe77e3d0..1ed6ffd0 100644
--- a/src/fade.c
+++ b/src/fade.c
@@ -38,9 +38,9 @@ void DoFade(u32 fadeType, u32 fadeSpeed) {
     }
     if ((fadeType & 8) != 0) {
         gUnk_03000000.spritesOffset = 1;
-        gScreen.bg.bg1Control |= 0x40;
-        gScreen.affine.bg2Control |= 0x40;
-        gScreen.affine.bg3Control |= 0x40;
+        gScreen.bg1.control |= 0x40;
+        gScreen.bg2.control |= 0x40;
+        gScreen.bg3.control |= 0x40;
     }
     if ((fadeType & 0x10) != 0) {
         sub_0801E1B8(gFadeControl.field_0x16, gFadeControl.field_0x18);
diff --git a/src/fileScreen.c b/src/fileScreen.c
index 46f01c41..cfc85b6b 100644
--- a/src/fileScreen.c
+++ b/src/fileScreen.c
@@ -109,19 +109,19 @@ void CreateDialogBox(u32 arg0, u32 arg1) {
     if (sfx) {
         SoundReq(sfx);
     }
-    gScreen.bg.bg0Updated = 1;
+    gScreen.bg0.updated = 1;
 }
 
 void sub_08050384(void) {
     RecoverUI(0, 0);
     MemClear(&gBG0Buffer, sizeof(gBG0Buffer));
-    gScreen.bg.bg0Updated = 1;
+    gScreen.bg0.updated = 1;
 }
 
 void sub_080503A8(u32 gfxGroup) {
     LoadGfxGroup(gfxGroup);
-    gScreen.bg.bg1Updated = 1;
-    gScreen.affine.bg2Updated = 1;
+    gScreen.bg1.updated = 1;
+    gScreen.bg2.updated = 1;
 }
 
 void SetFileSelectState(FileSelectState mode) {
@@ -162,12 +162,12 @@ void HandleChooseFileScreen(void) {
     sScreenHandlers[gMain.funcIndex]();
     if (gUnk_02032EC0.lastState != gUnk_02032EC0.state) {
         gUnk_02032EC0.lastState = gUnk_02032EC0.state;
-        gScreen.bg.bg0xOffset = 0;
-        gScreen.bg.bg0yOffset = 0;
-        gScreen.bg.bg1xOffset = 0;
-        gScreen.bg.bg1yOffset = 0;
-        gScreen.affine.bg2xOffset = 0;
-        gScreen.affine.bg2yOffset = 0;
+        gScreen.bg0.xOffset = 0;
+        gScreen.bg0.yOffset = 0;
+        gScreen.bg1.xOffset = 0;
+        gScreen.bg1.yOffset = 0;
+        gScreen.bg2.xOffset = 0;
+        gScreen.bg2.yOffset = 0;
         MemClear(&gChooseFileState, sizeof(gChooseFileState));
     }
 
@@ -220,7 +220,7 @@ static void HandleFileScreenEnter(void) {
     sub_080A70AC(&gUnk_080FC8D0);
     HideButtonR();
     gScreen.lcd.displayControl |= DISPCNT_BG_ALL_ON | DISPCNT_OBJ_ON;
-    gScreen.affine.bg3Control = BGCNT_PRIORITY(3) | BGCNT_CHARBASE(2) | BGCNT_SCREENBASE(30);
+    gScreen.bg3.control = BGCNT_PRIORITY(3) | BGCNT_CHARBASE(2) | BGCNT_SCREENBASE(30);
     gScreen.controls.layerFXControl = BLDCNT_TGT1_BG2 | BLDCNT_TGT2_BG3 | BLDCNT_EFFECT_BLEND;
     gScreen.controls.alphaBlend = BLDALPHA_BLEND(15, 10);
     gUnk_02024490.unk0 = 1;
@@ -525,7 +525,7 @@ void sub_08050AFC(u32 idx) {
     if (gUnk_02019EE0.saveStatus[idx] == SAVE_VALID) {
         sub_08050B3C(&gBG1Buffer[0x14E]);
     }
-    gScreen.bg.bg1Updated = 1;
+    gScreen.bg1.updated = 1;
 }
 
 typedef struct {
@@ -859,8 +859,8 @@ void sub_08051090(void) {
     sub_08050790();
     sub_0805070C();
     sub_08051458();
-    gScreen.bg.bg1yOffset = 0xff;
-    gScreen.affine.bg2yOffset = 0xff;
+    gScreen.bg1.yOffset = 0xff;
+    gScreen.bg2.yOffset = 0xff;
     sub_080A7114(1);
 }
 
diff --git a/src/game.c b/src/game.c
index 0d33c6ca..aade535d 100644
--- a/src/game.c
+++ b/src/game.c
@@ -248,7 +248,7 @@ NONMATCH("asm/non_matching/game/sub_08052418.inc", void sub_08052418(int param_1
     // temp._0 = gBG1Buffer[gUnk_080FCAA4._8[param_1]][gUnk_080FCAA4._0[gSaveHeader->gameLanguage + i]] * 2;
     temp._13 = ((temp._13 & 0xfe) | gUnk_080FCAA4._8[i + 1]) & 1;
     sub_0805F46C(gUnk_080FCAA4._a[param_1], &temp);
-    gScreen.bg.bg1xOffset = 1;
+    gScreen.bg1.xOffset = 1;
 }
 END_NONMATCH
 
diff --git a/src/interrupts.c b/src/interrupts.c
index da810ec6..680944e2 100644
--- a/src/interrupts.c
+++ b/src/interrupts.c
@@ -7,11 +7,11 @@
 #include "textbox.h"
 #include "functions.h"
 #include "object.h"
-#include "manager.h"
 #include "utils.h"
 #include "npc.h"
 #include "effects.h"
 #include "screen.h"
+#include "gba/m4a.h"
 
 extern u8 gUnk_03003DE0;
 extern u8 gUnk_03000C30;
@@ -22,18 +22,19 @@ extern u8 gUpdateVisibleTiles;
 extern u8 gUnk_03003DF0[];
 extern u8 gUnk_03003BE0;
 extern Entity* gUnk_03004040[3];
-extern u8 gUnk_020342F8;
+extern u16 gUnk_080B2CD8[];
+extern u32 gUnk_03000FBC;
 
 extern void sub_080ADD70();
 extern void sub_0801C25C();
 extern void UpdateDisplayControls();
 extern void LoadResources();
 extern void FadeMain();
-extern u32 CheckDontUpdate();
 extern void HandlePlayerLife();
 extern void DoPlayerAction();
 extern void sub_080171F0();
 extern void sub_08078FB0();
+extern u32 CheckDontUpdate();
 extern void DrawEntity();
 extern void sub_0807A050();
 extern u32 sub_08079B24();
@@ -44,43 +45,8 @@ extern void sub_08078180(void);
 extern void sub_0807B0C8(void);
 extern void sub_0807A8D8(Entity*);
 extern void sub_08077FEC(u32);
-extern void ItemInit(Entity*);
-extern void InitObject(Entity*);
-extern u32 ReadBit(void*, u32);
-extern void InitNPC(Entity*);
-extern void m4aSoundMain();
-extern void m4aSoundVSync();
 
-typedef struct {
-    u8 unk0;
-    u8 unk1;
-    u8 unk2;
-    u8 unk3;
-    u8 unk4;
-    u8 unk5;
-    u16 unk6;
-} ItemFrame;
-extern ItemFrame gUnk_08126DA8[];
-extern ItemFrame* gUnk_08126ED8[3];
-
-typedef struct {
-    u16 unk0;
-    u16 unk1;
-    u16 x;
-    u16 y;
-} NPCStruct;
-extern NPCStruct gUnk_02031EC0[100];
-
-// todo: merge with screen.h
-typedef struct {
-    u16 dest;
-    u16 _2;
-    u16 _4;
-    u16 _6;
-    u8* src;
-} DmaSettings;
-
-extern u16 gDmaPresets[];
+void gIntrMain(void);
 
 struct {
     u8 update;
@@ -95,18 +61,10 @@ struct {
     u32 size;
 } extern gUnk_02022730;
 
-void sub_08016CA8(DmaSettings* s);
+void sub_08016CA8(BgSettings* bg);
 void sub_08016BF8(void);
 void DispCtrlSet(void);
 
-extern u16 gUnk_080B2CD8[];
-
-extern u32 gUnk_03000FBC;
-
-void gIntrMain(void);
-
-typedef void (*fp)(void);
-
 void DummyIntr(void) {
     /* .. */
 }
@@ -157,18 +115,18 @@ void UpdateDisplayControls(void) {
         gUnk_03000000.update = 0;
         DmaCopy32(3, &gUnk_03000000.oam, 0x07000000, 0x400);
     }
-    sub_08016CA8((DmaSettings*)&gScreen.bg.bg0Control);
-    sub_08016CA8((DmaSettings*)&gScreen.bg.bg1Control);
-    sub_08016CA8((DmaSettings*)&gScreen.affine.bg2Control);
-    sub_08016CA8((DmaSettings*)&gScreen.affine.bg3Control);
+    sub_08016CA8(&gScreen.bg0);
+    sub_08016CA8(&gScreen.bg1);
+    sub_08016CA8((BgSettings*)&gScreen.bg2);
+    sub_08016CA8((BgSettings*)&gScreen.bg3);
 }
 
-void sub_08016CA8(DmaSettings* s) {
-    if (s->_6 && s->src != 0) {
+void sub_08016CA8(BgSettings* bg) {
+    if (bg->updated && bg->tilemap != NULL) {
         u32 dest;
-        s->_6 = 0;
-        dest = s->dest;
-        DmaCopy32(3, s->src, ((dest << 3) & 0xF800) + 0x06000000, gUnk_080B2CD8[dest >> 14]);
+        bg->updated = 0;
+        dest = bg->control;
+        DmaCopy32(3, bg->tilemap, ((dest << 3) & 0xF800) + 0x06000000, gUnk_080B2CD8[dest >> 14]);
     }
 }
 
@@ -322,7 +280,7 @@ void HandlePlayerLife(Entity* this) {
     } else if ((gSave.stats.effectTimer == 0) || --gSave.stats.effectTimer == 0) {
         gSave.stats.effect = 0;
     } else if ((gSave.stats.effectTimer & 0x3f) == 0) {
-        CreateFx(this, FX_AURA_BASE + gSave.stats.effect, 0);
+        CreateFx(this, (FX_RED_AURA - 1) + gSave.stats.effect, 0);
     }
 }
 #endif
@@ -373,91 +331,3 @@ void sub_080171F0(void) {
         sub_08077FEC(gPlayerEntity.action);
     }
 }
-
-void ItemUpdate(Entity* this) {
-    if ((this->flags & ENT_DID_INIT) == 0 && this->action == 0 && this->subAction == 0)
-        ItemInit(this);
-
-    if (!CheckDontUpdate(this)) {
-        gPlayerItemFunctions[this->id](this);
-        this->bitfield &= ~0x80;
-        if (this->iframes != 0) {
-            if (this->iframes > 0)
-                this->iframes--;
-            else
-                this->iframes++;
-        }
-    }
-    DrawEntity(this);
-}
-
-// tiny regalloc
-NONMATCH("asm/non_matching/arm_proxy/ItemInit.inc", void ItemInit(Entity* this)) {
-    ItemFrame* entry;
-
-    entry = &gUnk_08126DA8[this->id];
-    if (entry->unk0 == 0xff) {
-        u32 temp = entry->unk2;
-        ItemFrame* temp2 = gUnk_08126ED8[entry->unk1];
-        entry = &temp2[this->field_0x68.HALF.LO - temp];
-    }
-
-    this->palette.raw = ((entry->unk0 & 0xf) << 4) | entry->unk0;
-    this->damage = entry->unk1;
-    this->hurtType = entry->unk3;
-    this->hitType = entry->unk4;
-    this->spriteIndex = entry->unk5;
-    if (entry->unk6 == 0)
-        this->spriteVramOffset = gPlayerEntity.spriteVramOffset;
-    else
-        this->spriteVramOffset = entry->unk6 & 0x3ff;
-
-    if (this->animationState == 0)
-        this->animationState = gPlayerEntity.animationState & 6;
-
-    this->collisionLayer = gPlayerEntity.collisionLayer;
-    this->spriteRendering.b3 = gPlayerEntity.spriteRendering.b3;
-    this->spritePriority.b0 = gPlayerEntity.spritePriority.b0;
-    this->spriteOrientation.flipY = gPlayerEntity.spriteOrientation.flipY;
-    this->currentHealth = 1;
-    this->flags |= ENT_DID_INIT;
-}
-END_NONMATCH
-
-void ObjectUpdate(Entity* this) {
-    if ((this->flags & ENT_DID_INIT) == 0 && this->action == 0)
-        InitObject(this);
-    if (this->iframes != 0)
-        this->iframes++;
-    if (!CheckDontUpdate(this)) {
-        gObjectFunctions[this->id](this);
-        this->bitfield &= ~0x80;
-    }
-    DrawEntity(this);
-}
-
-void ManagerUpdate(Entity* this) {
-    if (!CheckDontUpdate(this))
-        gManagerFunctions[this->id](this);
-}
-
-// regalloc
-NONMATCH("asm/non_matching/arm_proxy/NPCUpdate.inc", void NPCUpdate(Entity* this)) {
-    if ((this->currentHealth & 0x7f) && !ReadBit(&gUnk_020342F8, this->currentHealth - 1))
-        DeleteThisEntity();
-    if (this->action == 0 && (this->flags & ENT_DID_INIT) == 0)
-        InitNPC(this);
-    if (!CheckDontUpdate(this))
-        gNPCFunctions[this->id][0](this);
-    if (this->next != NULL) {
-        if (gNPCFunctions[this->id][1] != NULL)
-            gNPCFunctions[this->id][1](this);
-        if ((this->currentHealth & 0x7f) != 0) {
-            u32 temp = this->currentHealth & 0x7f;
-            gUnk_02031EC0[temp * 2 - 2].x = this->x.HALF.HI - gRoomControls.roomOriginX;
-            gUnk_02031EC0[temp * 2 - 2].y = this->y.HALF.HI - gRoomControls.roomOriginY;
-        }
-        DrawEntity(this);
-    }
-}
-END_NONMATCH
diff --git a/src/intro.c b/src/intro.c
index 871caa64..fc28094e 100644
--- a/src/intro.c
+++ b/src/intro.c
@@ -101,7 +101,7 @@ static void HandleNintendoCapcomLogos(void) {
         }
         LoadPaletteGroup(paletteGroup);
         gScreen.lcd.displayControl |= DISPCNT_BG2_ON;
-        gScreen.bg.bg1Updated = 1;
+        gScreen.bg1.updated = 1;
         DoFade(6, 8);
         advance = ADVANCE_NONE;
 #if defined(DEMO_USA)
@@ -158,17 +158,17 @@ static void HandleTitlescreen(void) {
                 // Blend first and second layer
                 gScreen.controls.layerFXControl = BLDCNT_TGT1_BG2 | BLDCNT_TGT2_BG3 | BLDCNT_EFFECT_BLEND;
                 gScreen.controls.alphaBlend = BLDALPHA_BLEND(9, 9);
-                gScreen.bg.bg1Control = 0x1c09;
-                gScreen.affine.bg2Control = BGCNT_SCREENBASE(29) | BGCNT_PRIORITY(2);
-                gScreen.affine.bg3Control = BGCNT_SCREENBASE(30) | BGCNT_PRIORITY(3);
+                gScreen.bg1.control = 0x1c09;
+                gScreen.bg2.control = BGCNT_SCREENBASE(29) | BGCNT_PRIORITY(2);
+                gScreen.bg3.control = BGCNT_SCREENBASE(30) | BGCNT_PRIORITY(3);
                 gScreen.lcd.displayControl |= DISPCNT_BG1_ON | DISPCNT_BG2_ON | DISPCNT_BG3_ON | DISPCNT_OBJ_ON;
-                gScreen.bg.bg1yOffset = 0xff60;
+                gScreen.bg1.yOffset = 0xff60;
             } else {
                 gScreen.controls.layerFXControl = BLDCNT_TGT1_BG0 | BLDCNT_TGT2_BG1 | BLDCNT_EFFECT_BLEND;
                 gScreen.controls.alphaBlend = BLDALPHA_BLEND(9, 9);
-                gScreen.bg.bg0Control = BGCNT_SCREENBASE(29) | BGCNT_PRIORITY(2);
-                gScreen.bg.bg1Control = 0x1E03;
-                gScreen.affine.bg2Control = BGCNT_PRIORITY(1) | BGCNT_CHARBASE(2) | BGCNT_256COLOR |
+                gScreen.bg0.control = BGCNT_SCREENBASE(29) | BGCNT_PRIORITY(2);
+                gScreen.bg1.control = 0x1E03;
+                gScreen.bg2.control = BGCNT_PRIORITY(1) | BGCNT_CHARBASE(2) | BGCNT_256COLOR |
                                             BGCNT_SCREENBASE(28) | BGCNT_WRAP | BGCNT_TXT512x256;
                 gScreen.lcd.displayControl |= DISPCNT_MODE_1;
                 gScreen.lcd.displayControl |= DISPCNT_BG0_ON | DISPCNT_BG1_ON | DISPCNT_OBJ_ON;
@@ -278,13 +278,13 @@ static void HandleJapaneseTitlescreenAnimationIntro(void) {
         case 0:
             if (!gFadeControl.active) {
                 if ((gIntroState.counter & 1) == 0) {
-                    gScreen.bg.bg1yOffset++;
+                    gScreen.bg1.yOffset++;
                 }
 
-                if (GetAdvanceState() == ADVANCE_KEY_PRESSED || gScreen.bg.bg1yOffset == 0) {
+                if (GetAdvanceState() == ADVANCE_KEY_PRESSED || gScreen.bg1.yOffset == 0) {
                     gIntroState.subState++;
-                    gScreen.bg.bg1yOffset = 0;
-                    gScreen.bg.bg1Control = 0xc09;
+                    gScreen.bg1.yOffset = 0;
+                    gScreen.bg1.control = 0xc09;
                     gFadeControl.mask = 0x00000040;
                     DoFade(6, 0x10);
                     SoundReq(SFX_F8);
diff --git a/src/manager.c b/src/manager.c
index 1d8974cf..eda605a0 100644
--- a/src/manager.c
+++ b/src/manager.c
@@ -12,3 +12,8 @@ void (*const gManagerFunctions[])() = {
     Manager31_Main, Manager32_Main, Manager33_Main, Manager34_Main, Manager35_Main, Manager36_Main, Manager37_Main,
     Manager38_Main, Manager39_Main
 };
+
+void ManagerUpdate(Entity* this) {
+    if (!CheckDontUpdate(this))
+        gManagerFunctions[this->id](this);
+}
diff --git a/src/manager/manager1.c b/src/manager/manager1.c
index 59a9373f..f0fb5e49 100644
--- a/src/manager/manager1.c
+++ b/src/manager/manager1.c
@@ -32,7 +32,7 @@ void sub_080570B8(Entity* this) {
     this->height.WORD = 0;
     pbVar1 = ((u8*)&this->hVelocity + 1);
     if (*pbVar1 == 3) {
-        gScreen.affine.bg3Updated = 1;
+        gScreen.bg3.updated = 1;
     } else {
         gUnk_08107C48[*pbVar1](this);
     }
@@ -50,7 +50,7 @@ void sub_08057118(Entity* this) {
     ((u8*)&this->hVelocity)[1] = 0;
     ((u8*)&this->hVelocity)[2] = 0;
     this->action = 1;
-    gScreen.affine.bg3Control = 0x1e04;
+    gScreen.bg3.control = 0x1e04;
     gScreen.lcd.displayControl |= 0x800;
     gScreen.controls.layerFXControl = 0x3648;
     gScreen.controls.alphaBlend = 0x1000;
diff --git a/src/manager/manager10.c b/src/manager/manager10.c
index 658bf297..d010ed06 100644
--- a/src/manager/manager10.c
+++ b/src/manager/manager10.c
@@ -97,8 +97,8 @@ void sub_08059690(Manager10* this) {
 
 void sub_080596E0(Manager10* this) {
     if ((gScreenTransition.frameCount & 7) == 0) {
-        gScreen.bg.bg1xOffset += 8;
-        gScreen.bg.bg1xOffset &= 0x1F;
+        gScreen.bg1.xOffset += 8;
+        gScreen.bg1.xOffset &= 0x1F;
     }
     if (sub_0805986C()) {
         if (this->unk_21 == 0 && this->unk_22 != 2) {
@@ -142,7 +142,7 @@ void sub_080596E0(Manager10* this) {
                 LoadResourceAsync(gBG3Buffer, 0x600e800, 0x800);
                 break;
             case 5:
-                gUnk_0200B650 = &gScreen.bg.bg1Control;
+                gUnk_0200B650 = &gScreen.bg1.control;
                 gScreen.lcd.displayControl |= 0x200;
                 break;
         }
diff --git a/src/manager/manager15.c b/src/manager/manager15.c
index b0ce0828..02cf723f 100644
--- a/src/manager/manager15.c
+++ b/src/manager/manager15.c
@@ -397,9 +397,9 @@ void sub_0805A8EC(Manager15* this) {
 
 void sub_0805A94C(Manager15* this) {
     int tmp1, tmp2;
-    gScreen.affine.bg3xOffset = gRoomControls.roomScrollX - this->unk_24 + this->unk_34;
-    gScreen.affine.bg3yOffset = gRoomControls.roomScrollY - this->unk_26 + this->unk_36;
-    tmp1 = -gScreen.affine.bg3xOffset;
+    gScreen.bg3.xOffset = gRoomControls.roomScrollX - this->unk_24 + this->unk_34;
+    gScreen.bg3.yOffset = gRoomControls.roomScrollY - this->unk_26 + this->unk_36;
+    tmp1 = -gScreen.bg3.xOffset;
     tmp2 = tmp1 + 0x100;
     if (tmp1 < 0)
         tmp1 = 0;
@@ -410,7 +410,7 @@ void sub_0805A94C(Manager15* this) {
     if (tmp2 > 0xF0)
         tmp2 = 0xF0;
     gScreen.controls.window1HorizontalDimensions = (tmp1 << 8 | tmp2);
-    tmp1 = -gScreen.affine.bg3yOffset;
+    tmp1 = -gScreen.bg3.yOffset;
     tmp2 = tmp1 + 0x100;
     if (tmp1 < 0)
         tmp1 = 0;
@@ -426,8 +426,8 @@ void sub_0805A94C(Manager15* this) {
 void sub_0805A9CC(Manager15* this) {
     int tmp1, tmp2;
     void* tmp3;
-    gScreen.affine.bg3xOffset = gRoomControls.roomScrollX - this->unk_24 + this->unk_34;
-    tmp1 = -gScreen.affine.bg3xOffset;
+    gScreen.bg3.xOffset = gRoomControls.roomScrollX - this->unk_24 + this->unk_34;
+    tmp1 = -gScreen.bg3.xOffset;
     tmp2 = tmp1 + 0x100;
     if (tmp1 < 0)
         tmp1 = 0;
@@ -439,14 +439,14 @@ void sub_0805A9CC(Manager15* this) {
         tmp2 = 0xF0;
     gScreen.controls.window1HorizontalDimensions = tmp1 << 8 | tmp2;
     tmp1 = gRoomControls.roomScrollY - this->unk_26 + this->unk_36;
-    gScreen.affine.bg3yOffset = tmp1 & 0x3F;
+    gScreen.bg3.yOffset = tmp1 & 0x3F;
     tmp3 = (&gBG3Buffer[((tmp1 / 0x40) << 8)]);
-    gScreen.affine.bg3Tilemap = (u32*)tmp3;
+    gScreen.bg3.tilemap = (u32*)tmp3;
     gScreen.controls.window1VerticalDimensions = 0xa0;
     if (this->unk_28 == tmp3)
         return;
     this->unk_28 = tmp3;
-    gScreen.affine.bg3Updated = 1;
+    gScreen.bg3.updated = 1;
 }
 
 extern struct { u8 unk_00[0x20]; } gUnk_085A97A0[];
@@ -483,11 +483,11 @@ void sub_0805AAF0(u32 unk0) {
     sub_0805AADC(unk0);
     gScreen.controls.layerFXControl = 0x3E48;
     gScreen.controls.alphaBlend = 0x1008;
-    gScreen.affine.bg3Control = 0x1E04;
-    gScreen.affine.bg3Tilemap = &gBG3Buffer;
-    gScreen.affine.bg3xOffset = 0;
-    gScreen.affine.bg3yOffset = 0;
-    gScreen.affine.bg3Updated = 1;
+    gScreen.bg3.control = 0x1E04;
+    gScreen.bg3.tilemap = &gBG3Buffer;
+    gScreen.bg3.xOffset = 0;
+    gScreen.bg3.yOffset = 0;
+    gScreen.bg3.updated = 1;
     gScreen.controls.windowInsideControl = 0x3F3F;
     gScreen.controls.windowOutsideControl = 0x37;
     gScreen.controls.window1HorizontalDimensions = 0xF0;
diff --git a/src/manager/manager18.c b/src/manager/manager18.c
index cadd8885..dd7d553e 100644
--- a/src/manager/manager18.c
+++ b/src/manager/manager18.c
@@ -40,19 +40,19 @@ void Manager18_Main(Manager18* this) {
             }
             gRoomControls.bg3OffsetX.WORD -= 0x2000;
             gRoomControls.bg3OffsetY.WORD -= 0x1000;
-            gScreen.affine.bg3xOffset = gRoomControls.roomScrollX + gRoomControls.bg3OffsetX.HALF.HI;
-            gScreen.affine.bg3yOffset = gRoomControls.roomScrollY + gRoomControls.bg3OffsetY.HALF.HI;
+            gScreen.bg3.xOffset = gRoomControls.roomScrollX + gRoomControls.bg3OffsetX.HALF.HI;
+            gScreen.bg3.yOffset = gRoomControls.roomScrollY + gRoomControls.bg3OffsetY.HALF.HI;
         }
     }
 }
 
 void sub_0805AEDC(Manager18* this) {
-    gScreen.affine.bg3Control = 0x1e05;
+    gScreen.bg3.control = 0x1e05;
     gScreen.lcd.displayControl |= 0x800;
     gScreen.controls.layerFXControl = 0x3648;
     gScreen.controls.alphaBlend = (this != NULL) ? this->field_0x20 : 0x1000;
-    gScreen.affine.bg3xOffset = gRoomControls.roomScrollX + gRoomControls.bg3OffsetX.HALF.HI;
-    gScreen.affine.bg3yOffset = gRoomControls.roomScrollY + gRoomControls.bg3OffsetY.HALF.HI;
+    gScreen.bg3.xOffset = gRoomControls.roomScrollX + gRoomControls.bg3OffsetX.HALF.HI;
+    gScreen.bg3.yOffset = gRoomControls.roomScrollY + gRoomControls.bg3OffsetY.HALF.HI;
     if (this != NULL) {
         Manager18_Main(this);
     }
diff --git a/src/manager/manager19.c b/src/manager/manager19.c
index fa0f1912..6c03287a 100644
--- a/src/manager/manager19.c
+++ b/src/manager/manager19.c
@@ -23,15 +23,15 @@ void Manager19_Main(Manager* this) {
             }
         } else {
             gRoomControls.bg3OffsetX.WORD = gRoomControls.bg3OffsetX.WORD - 0x2000;
-            gScreen.affine.bg3xOffset = gRoomControls.roomScrollX + gRoomControls.bg3OffsetX.HALF.HI;
-            gScreen.affine.bg3yOffset = gRoomControls.roomScrollY + gRoomControls.bg3OffsetY.HALF.HI;
+            gScreen.bg3.xOffset = gRoomControls.roomScrollX + gRoomControls.bg3OffsetX.HALF.HI;
+            gScreen.bg3.yOffset = gRoomControls.roomScrollY + gRoomControls.bg3OffsetY.HALF.HI;
         }
     }
 }
 
 void sub_0805AFFC(Manager* this) {
-    gScreen.affine.bg3Control = 0x1e03;
+    gScreen.bg3.control = 0x1e03;
     gScreen.lcd.displayControl |= 0x800;
-    gScreen.affine.bg3xOffset = gRoomControls.roomScrollX + gRoomControls.bg3OffsetX.HALF.HI;
-    gScreen.affine.bg3yOffset = gRoomControls.roomScrollY + gRoomControls.bg3OffsetY.HALF.HI;
+    gScreen.bg3.xOffset = gRoomControls.roomScrollX + gRoomControls.bg3OffsetX.HALF.HI;
+    gScreen.bg3.yOffset = gRoomControls.roomScrollY + gRoomControls.bg3OffsetY.HALF.HI;
 }
diff --git a/src/manager/manager1A.c b/src/manager/manager1A.c
index 838fd898..632a25b7 100644
--- a/src/manager/manager1A.c
+++ b/src/manager/manager1A.c
@@ -199,9 +199,9 @@ void sub_0805B2B0(Manager1A* this) {
     }
     gScreen.lcd.displayControl |= 0x800;
     gRoomControls.bg3OffsetX.HALF.HI = gRoomControls.roomScrollX + this->unk_34 + tmp;
-    gScreen.affine.bg3xOffset = gRoomControls.roomScrollX + this->unk_34 + tmp;
+    gScreen.bg3.xOffset = gRoomControls.roomScrollX + this->unk_34 + tmp;
     gRoomControls.bg3OffsetY.HALF.HI = gRoomControls.roomScrollY + this->unk_36 + tmp2;
-    gScreen.affine.bg3yOffset = gRoomControls.roomScrollY + this->unk_36 + tmp2;
+    gScreen.bg3.yOffset = gRoomControls.roomScrollY + this->unk_36 + tmp2;
 }
 
 void sub_0805B328(Manager1A* this) {
@@ -210,10 +210,10 @@ void sub_0805B328(Manager1A* this) {
         return;
     tmp = &gUnk_08108764[this->manager.unk_0a];
     LoadResourceAsync(&gGlobalGfxAndPalettes[tmp->unk_0c->unk_00], 0x0600F000, 0x800);
-    gScreen.affine.bg3Control = 0x1E07;
+    gScreen.bg3.control = 0x1E07;
     gScreen.lcd.displayControl |= 0x800;
-    gScreen.affine.bg3xOffset = gRoomControls.bg3OffsetX.HALF.HI;
-    gScreen.affine.bg3yOffset = gRoomControls.bg3OffsetY.HALF.HI;
+    gScreen.bg3.xOffset = gRoomControls.bg3OffsetX.HALF.HI;
+    gScreen.bg3.yOffset = gRoomControls.bg3OffsetY.HALF.HI;
     gScreen.controls.layerFXControl &= ~0x8;
 }
 
diff --git a/src/manager/manager1B.c b/src/manager/manager1B.c
index 3dd4f36f..47fd8714 100644
--- a/src/manager/manager1B.c
+++ b/src/manager/manager1B.c
@@ -46,14 +46,14 @@ void Manager1B_Main(Manager1B* this) {
 }
 
 void sub_0805B448(Manager1B* this) {
-    gScreen.affine.bg3xOffset = (gRoomControls.roomScrollX - gRoomControls.roomOriginX) >> 2;
-    gScreen.affine.bg3yOffset = ((gRoomControls.roomScrollY - gRoomControls.roomOriginY) >> 1) + this->field_0x20;
+    gScreen.bg3.xOffset = (gRoomControls.roomScrollX - gRoomControls.roomOriginX) >> 2;
+    gScreen.bg3.yOffset = ((gRoomControls.roomScrollY - gRoomControls.roomOriginY) >> 1) + this->field_0x20;
 }
 
 void sub_0805B474(Manager1B* this) {
     s32 tmp = ((gRoomControls.roomScrollY - gRoomControls.roomOriginY) * 0x60) / (gRoomControls.height - 0xa0);
-    gScreen.affine.bg3yOffset = gRoomControls.roomOriginY + tmp;
-    gScreen.affine.bg3xOffset = gRoomControls.roomScrollX - ((gRoomControls.width - 0x100) / 2);
+    gScreen.bg3.yOffset = gRoomControls.roomOriginY + tmp;
+    gScreen.bg3.xOffset = gRoomControls.roomScrollX - ((gRoomControls.width - 0x100) / 2);
 }
 
 void sub_0805B4B4(Manager1B* this) {
@@ -69,14 +69,14 @@ void sub_0805B4D0(u32 param_1) {
     u32 uVar2;
 
     LoadGfxGroup(gUnk_08108C5C[param_1]);
-    gScreen.affine.bg3Control = 0x1e07;
+    gScreen.bg3.control = 0x1e07;
     gScreen.lcd.displayControl |= 0x800;
-    gScreen.affine.bg3xOffset = (gRoomControls.roomScrollX - gRoomControls.roomOriginX) >> 2;
+    gScreen.bg3.xOffset = (gRoomControls.roomScrollX - gRoomControls.roomOriginX) >> 2;
 
     uVar2 = (gRoomControls.roomScrollY - gRoomControls.roomOriginY) >> 1;
     iVar1 = 0x100 - gRoomControls.height;
     if (iVar1 < 0) {
         iVar1 = 0;
     }
-    gScreen.affine.bg3yOffset = uVar2 + iVar1 + gUnk_08108C44[param_1];
+    gScreen.bg3.yOffset = uVar2 + iVar1 + gUnk_08108C44[param_1];
 }
diff --git a/src/manager/manager1D.c b/src/manager/manager1D.c
index 6d1a850b..63ffcf8c 100644
--- a/src/manager/manager1D.c
+++ b/src/manager/manager1D.c
@@ -14,19 +14,19 @@ void sub_0805B5E0(Manager* this) {
     this->action = 1;
 
     gScreen.lcd.displayControl |= 0x800;
-    gScreen.affine.bg3Control = gUnk_08108C88[this->unk_0a];
+    gScreen.bg3.control = gUnk_08108C88[this->unk_0a];
     gRoomControls.bg3OffsetY.WORD = 0;
     gRoomControls.bg3OffsetX.WORD = 0;
 
     switch (this->unk_0a) {
         case 0:
         default:
-            gScreen.affine.bg3yOffset = 0;
-            gScreen.affine.bg3xOffset = 0;
+            gScreen.bg3.yOffset = 0;
+            gScreen.bg3.xOffset = 0;
             break;
         case 1:
-            gScreen.affine.bg3xOffset = gRoomControls.roomScrollX + gRoomControls.bg3OffsetX.HALF.HI;
-            gScreen.affine.bg3yOffset = gRoomControls.roomScrollY + gRoomControls.bg3OffsetY.HALF.HI;
+            gScreen.bg3.xOffset = gRoomControls.roomScrollX + gRoomControls.bg3OffsetX.HALF.HI;
+            gScreen.bg3.yOffset = gRoomControls.roomScrollY + gRoomControls.bg3OffsetY.HALF.HI;
             break;
     }
 }
@@ -34,7 +34,7 @@ void sub_0805B5E0(Manager* this) {
 void sub_0805B638(Manager* this) {
     if (this->unk_0a == 1) {
         gRoomControls.bg3OffsetX.WORD = gRoomControls.bg3OffsetX.WORD + 0x2000;
-        gScreen.affine.bg3xOffset = gRoomControls.roomScrollX + gRoomControls.bg3OffsetX.HALF.HI;
-        gScreen.affine.bg3yOffset = gRoomControls.roomScrollY + gRoomControls.bg3OffsetY.HALF.HI;
+        gScreen.bg3.xOffset = gRoomControls.roomScrollX + gRoomControls.bg3OffsetX.HALF.HI;
+        gScreen.bg3.yOffset = gRoomControls.roomScrollY + gRoomControls.bg3OffsetY.HALF.HI;
     }
 }
diff --git a/src/manager/manager2.c b/src/manager/manager2.c
index 6f020f25..05fe08f7 100644
--- a/src/manager/manager2.c
+++ b/src/manager/manager2.c
@@ -21,8 +21,8 @@ extern u32 gUnk_0200B650;
 void Manager2_Main(Manager2* this) {
     if (this->manager.action == 0) {
         this->manager.action = 1;
-        gScreen.affine.bg3Updated = 0;
-        gScreen.bg.bg1Updated = 0;
+        gScreen.bg3.updated = 0;
+        gScreen.bg1.updated = 0;
         sub_08052D74(this, sub_080576A0, 0);
     }
     sub_0805754C(this);
@@ -33,19 +33,19 @@ void sub_0805754C(Manager2* this) {
 
     bgOffset = (gRoomControls.roomScrollY - gRoomControls.roomOriginY);
     bgOffset += bgOffset >> 3;
-    gScreen.affine.bg3yOffset = bgOffset & 0x3f;
-    gScreen.affine.bg3Tilemap = gMapDataTopSpecial + (bgOffset / 0x40) * 0x200;
-    if (this->field_0x38 != gScreen.affine.bg3Tilemap) {
-        this->field_0x38 = gScreen.affine.bg3Tilemap;
-        gScreen.affine.bg3Updated = 1;
+    gScreen.bg3.yOffset = bgOffset & 0x3f;
+    gScreen.bg3.tilemap = gMapDataTopSpecial + (bgOffset / 0x40) * 0x200;
+    if (this->field_0x38 != gScreen.bg3.tilemap) {
+        this->field_0x38 = gScreen.bg3.tilemap;
+        gScreen.bg3.updated = 1;
     }
     bgOffset = (gRoomControls.roomScrollY - gRoomControls.roomOriginY);
     bgOffset += bgOffset >> 2;
-    gScreen.bg.bg1yOffset = bgOffset & 0x3f;
-    gScreen.bg.bg1Tilemap = gMapDataTopSpecial + 0x2000 + (bgOffset / 0x40) * 0x200;
-    if (this->field_0x3c != gScreen.bg.bg1Tilemap) {
-        this->field_0x3c = gScreen.bg.bg1Tilemap;
-        gScreen.bg.bg1Updated = 1;
+    gScreen.bg1.yOffset = bgOffset & 0x3f;
+    gScreen.bg1.tilemap = gMapDataTopSpecial + 0x2000 + (bgOffset / 0x40) * 0x200;
+    if (this->field_0x3c != gScreen.bg1.tilemap) {
+        this->field_0x3c = gScreen.bg1.tilemap;
+        gScreen.bg1.updated = 1;
     }
 }
 
@@ -59,27 +59,27 @@ void sub_080575C8(u32 param) {
 
     bgOffset = (gRoomControls.roomScrollY - gRoomControls.roomOriginY);
     bgOffset += bgOffset >> 3;
-    gScreen.affine.bg3yOffset = bgOffset & 0x3f;
-    gScreen.affine.bg3xOffset = 0;
-    gScreen.affine.bg3Tilemap = &gMapDataTopSpecial[(bgOffset / 0x40) * 0x200];
-    gScreen.affine.bg3Control = 0x1d49;
-    gScreen.affine.bg3Updated = 1;
+    gScreen.bg3.yOffset = bgOffset & 0x3f;
+    gScreen.bg3.xOffset = 0;
+    gScreen.bg3.tilemap = &gMapDataTopSpecial[(bgOffset / 0x40) * 0x200];
+    gScreen.bg3.control = 0x1d49;
+    gScreen.bg3.updated = 1;
 
     bgOffset = (gRoomControls.roomScrollY - gRoomControls.roomOriginY);
     bgOffset += bgOffset >> 2;
-    gScreen.bg.bg1yOffset = bgOffset & 0x3f;
-    gScreen.bg.bg1xOffset = 0;
-    gScreen.bg.bg1Tilemap = &gMapDataTopSpecial[0x2000 + (bgOffset / 0x40) * 0x200];
-    gScreen.bg.bg1Control = 0x1e49;
-    gScreen.bg.bg1Updated = 1;
+    gScreen.bg1.yOffset = bgOffset & 0x3f;
+    gScreen.bg1.xOffset = 0;
+    gScreen.bg1.tilemap = &gMapDataTopSpecial[0x2000 + (bgOffset / 0x40) * 0x200];
+    gScreen.bg1.control = 0x1e49;
+    gScreen.bg1.updated = 1;
     gScreen.controls.layerFXControl = 0x3c48;
     gScreen.controls.alphaBlend = 0x609;
     gScreen.lcd.displayControl |= 0xa00;
 }
 
 void sub_08057688(void) {
-    gScreen.affine.bg3Control = 0x1d48;
-    gScreen.bg.bg1Control = 0x1e48;
+    gScreen.bg3.control = 0x1d48;
+    gScreen.bg1.control = 0x1e48;
 }
 
 void sub_080576A0(Manager2* this) {
diff --git a/src/manager/manager2F.c b/src/manager/manager2F.c
index 68e41338..a86073ae 100644
--- a/src/manager/manager2F.c
+++ b/src/manager/manager2F.c
@@ -25,16 +25,16 @@ void Manager2F_Main(Manager* this) {
         } else {
             gRoomControls.bg3OffsetX.WORD -= 0x4000;
             gRoomControls.bg3OffsetY.WORD -= 0x2000;
-            gScreen.affine.bg3xOffset = gRoomControls.roomScrollX + gRoomControls.bg3OffsetX.HALF.HI;
-            gScreen.affine.bg3yOffset = gRoomControls.roomScrollY + gRoomControls.bg3OffsetY.HALF.HI;
+            gScreen.bg3.xOffset = gRoomControls.roomScrollX + gRoomControls.bg3OffsetX.HALF.HI;
+            gScreen.bg3.yOffset = gRoomControls.roomScrollY + gRoomControls.bg3OffsetY.HALF.HI;
         }
     }
 }
 
 void sub_0805D470(Manager* this) {
     LoadGfxGroup(0x4c);
-    gScreen.affine.bg3Control = 0x1e07;
+    gScreen.bg3.control = 0x1e07;
     gScreen.lcd.displayControl |= 0x800;
-    gScreen.affine.bg3xOffset = gRoomControls.roomScrollX + gRoomControls.bg3OffsetX.HALF.HI;
-    gScreen.affine.bg3yOffset = gRoomControls.roomScrollY + gRoomControls.bg3OffsetY.HALF.HI;
+    gScreen.bg3.xOffset = gRoomControls.roomScrollX + gRoomControls.bg3OffsetX.HALF.HI;
+    gScreen.bg3.yOffset = gRoomControls.roomScrollY + gRoomControls.bg3OffsetY.HALF.HI;
 }
diff --git a/src/manager/manager32.c b/src/manager/manager32.c
index 514aedf6..8360492e 100644
--- a/src/manager/manager32.c
+++ b/src/manager/manager32.c
@@ -65,7 +65,7 @@ void sub_0805D7DC(Manager32* this) {
     }
 
     LoadGfxGroup(gUnk_08108D74[index]);
-    gScreen.affine.bg3Control = 0x1e04;
+    gScreen.bg3.control = 0x1e04;
 }
 
 void sub_0805D860(Manager32* this) {
@@ -152,8 +152,8 @@ void sub_0805D9D8(Manager32* this) {
     // TODO find out the actual type of the parent of this manager.
     Manager* pMVar1 = this->manager.parent;
     if (pMVar1 != NULL) {
-        gScreen.affine.bg3xOffset = 0x80 - (*(s16*)&pMVar1[1].unk_0e - gRoomControls.roomScrollX);
-        gScreen.affine.bg3yOffset = 0x8c - (*(s16*)(pMVar1[1].unk_11 + 1) - gRoomControls.roomScrollY);
+        gScreen.bg3.xOffset = 0x80 - (*(s16*)&pMVar1[1].unk_0e - gRoomControls.roomScrollX);
+        gScreen.bg3.yOffset = 0x8c - (*(s16*)(pMVar1[1].unk_11 + 1) - gRoomControls.roomScrollY);
     }
 }
 
@@ -161,7 +161,7 @@ void sub_0805DA08(u32 x, u32 y, u32 param_3) {
     u32 i;
     struct BgAffineDstData* affineDstData = &gUnk_02017AA0[gUnk_03003DE4[0] * 0xa0];
     for (i = 0; i < 0xa0; ++i, y += 0x17) {
-        affineDstData->pa = ((gSineTable[(param_3 + i + y) & 0xff] * x) >> 8) + gScreen.affine.bg3xOffset;
+        affineDstData->pa = ((gSineTable[(param_3 + i + y) & 0xff] * x) >> 8) + gScreen.bg3.xOffset;
         affineDstData = (struct BgAffineDstData*)&affineDstData->pb;
     }
     sub_0805622C(&gUnk_02017AA0[gUnk_03003DE4[0] * 0xa0], 0x400001c, 0xa2600001);
diff --git a/src/manager/manager39.c b/src/manager/manager39.c
index d607b3c2..567a38dd 100644
--- a/src/manager/manager39.c
+++ b/src/manager/manager39.c
@@ -69,7 +69,7 @@ void sub_0805E18C(Manager39* this) {
 
 void sub_0805E1D8(Manager39* this) {
     MemClear(&gUnk_02034DF0, 0x80);
-    gScreen.bg.bg0Updated = 1;
+    gScreen.bg0.updated = 1;
     DeleteThisEntity();
 }
 
@@ -89,5 +89,5 @@ void sub_0805E1F8(u32 unk0, u32 unk1) {
     if (!unk1)
         tmp2 = gUnk_08108E30;
     sub_0805F46C(&tmp, tmp2);
-    gScreen.bg.bg0Updated = 1;
+    gScreen.bg0.updated = 1;
 }
diff --git a/src/manager/manager8.c b/src/manager/manager8.c
index 198cb0e3..4debcb08 100644
--- a/src/manager/manager8.c
+++ b/src/manager/manager8.c
@@ -23,8 +23,8 @@ void Manager8_Main(Manager8* this) {
     sub_08057F20(this);
     if (!this->manager.action) {
         this->manager.action = 1;
-        gScreen.bg.bg1Updated = 0;
-        gScreen.affine.bg3Updated = 0;
+        gScreen.bg1.updated = 0;
+        gScreen.bg3.updated = 0;
         sub_08052D74(this, sub_08057EFC, 0);
     }
 }
@@ -45,25 +45,25 @@ void sub_08057F20(Manager8* this) {
     u32 tmp;
     tmp = gRoomControls.roomScrollX - gRoomControls.roomOriginX;
     tmp = tmp + (tmp >> 3) + ((0x400 - gRoomControls.width) / 2);
-    gScreen.affine.bg3xOffset = tmp & 0xF;
-    gScreen.affine.bg3yOffset = 0x30 - ((0x30 - (gRoomControls.roomScrollY - gRoomControls.roomOriginY)) >> 2);
-    gScreen.affine.bg3Tilemap = gBG3Buffer;
+    gScreen.bg3.xOffset = tmp & 0xF;
+    gScreen.bg3.yOffset = 0x30 - ((0x30 - (gRoomControls.roomScrollY - gRoomControls.roomOriginY)) >> 2);
+    gScreen.bg3.tilemap = gBG3Buffer;
     sub_08058004(tmp, gUnk_02006F00, gBG3Buffer);
     tmp = ((tmp >> 4) << 1);
     if (this->unk_38 != tmp) {
         this->unk_38 = tmp;
-        gScreen.affine.bg3Updated = 1;
+        gScreen.bg3.updated = 1;
     }
     tmp = (gRoomControls.roomScrollX - gRoomControls.roomOriginX);
     tmp = tmp + (tmp >> 2) + ((0x400 - gRoomControls.width) / 2);
-    gScreen.bg.bg1xOffset = tmp & 0xF;
-    gScreen.bg.bg1yOffset = 0x30 - ((0x30 - (gRoomControls.roomScrollY - gRoomControls.roomOriginY)) >> 1);
-    gScreen.bg.bg1Tilemap = gBG3Buffer + 0x400;
+    gScreen.bg1.xOffset = tmp & 0xF;
+    gScreen.bg1.yOffset = 0x30 - ((0x30 - (gRoomControls.roomScrollY - gRoomControls.roomOriginY)) >> 1);
+    gScreen.bg1.tilemap = gBG3Buffer + 0x400;
     sub_08058004(tmp, gUnk_02006F00 + 0x2000, gBG3Buffer + 0x400);
     tmp = ((tmp >> 4) << 1);
     if (this->unk_3c != tmp) {
         this->unk_3c = tmp;
-        gScreen.bg.bg1Updated = 1;
+        gScreen.bg1.updated = 1;
     }
 }
 
@@ -115,19 +115,19 @@ void sub_080580B0(u32 unk1) {
     tmp = gRoomControls.roomScrollX - gRoomControls.roomOriginX; // r7
     tmp = tmp + (tmp >> 3) + (0x400 - gRoomControls.width) / 2;
     sub_08058004(tmp, gUnk_02006F00, gBG3Buffer);
-    gScreen.affine.bg3xOffset = tmp & 0xF;
-    gScreen.affine.bg3yOffset = 0x30 - ((0x30 - (gRoomControls.roomScrollY - gRoomControls.roomOriginY)) >> 1); //?
-    gScreen.affine.bg3Control = 0x1D09;
-    gScreen.affine.bg3Tilemap = gBG3Buffer;
-    gScreen.affine.bg3Updated = 1;
+    gScreen.bg3.xOffset = tmp & 0xF;
+    gScreen.bg3.yOffset = 0x30 - ((0x30 - (gRoomControls.roomScrollY - gRoomControls.roomOriginY)) >> 1); //?
+    gScreen.bg3.control = 0x1D09;
+    gScreen.bg3.tilemap = gBG3Buffer;
+    gScreen.bg3.updated = 1;
     tmp = gRoomControls.roomScrollX - gRoomControls.roomOriginX; // r7
     tmp = tmp + (tmp >> 2) + (0x400 - gRoomControls.width) / 2;
     sub_08058004(tmp, gUnk_02006F00 + 0x2000, gBG3Buffer + 0x400);
-    gScreen.bg.bg1xOffset = tmp & 0xF;
-    gScreen.bg.bg1yOffset = 0x30 - ((0x30 - (gRoomControls.roomScrollY - gRoomControls.roomOriginY)) >> 1); //?
-    gScreen.bg.bg1Control = 0x1E09;
-    gScreen.bg.bg1Tilemap = gBG3Buffer + 0x400;
-    gScreen.bg.bg1Updated = 1;
+    gScreen.bg1.xOffset = tmp & 0xF;
+    gScreen.bg1.yOffset = 0x30 - ((0x30 - (gRoomControls.roomScrollY - gRoomControls.roomOriginY)) >> 1); //?
+    gScreen.bg1.control = 0x1E09;
+    gScreen.bg1.tilemap = gBG3Buffer + 0x400;
+    gScreen.bg1.updated = 1;
     gScreen.controls.layerFXControl = 0x3C48;
     gScreen.controls.alphaBlend = 0x609;
     gScreen.lcd.displayControl |= 0xa00;
diff --git a/src/manager/manager9.c b/src/manager/manager9.c
index 0cce35fe..7cc81df0 100644
--- a/src/manager/manager9.c
+++ b/src/manager/manager9.c
@@ -24,7 +24,7 @@ void Manager9_Main(Manager9* this) {
     sub_08058210(this);
     if (!this->manager.action) {
         this->manager.action = 1;
-        gScreen.bg.bg1Updated = 0;
+        gScreen.bg1.updated = 0;
         sub_08052D74(this, sub_08058204, NULL);
     }
 }
@@ -39,7 +39,7 @@ void sub_08058210(Manager9* this) {
         return;
     this->unk_3c = tmp;
     sub_080582A0(tmp, gUnk_02006F00, gBG3Buffer);
-    gScreen.bg.bg1Updated = 1;
+    gScreen.bg1.updated = 1;
 }
 
 u32 sub_08058244(int i) {
@@ -48,9 +48,9 @@ u32 sub_08058244(int i) {
     u32 tmp3;
     s32 tmp4;
     tmp = ((gRoomControls.roomScrollY - gRoomControls.roomOriginY) * 0x20) / (gRoomControls.height - 0xa0);
-    gScreen.bg.bg1yOffset = gRoomControls.roomOriginY + tmp;
+    gScreen.bg1.yOffset = gRoomControls.roomOriginY + tmp;
     tmp = (((gRoomControls.roomScrollX - gRoomControls.roomOriginX) * gUnk_081081EC[i]) / (gRoomControls.width - 0xf0));
-    gScreen.bg.bg1xOffset = tmp & 0xf;
+    gScreen.bg1.xOffset = tmp & 0xf;
     return tmp;
 }
 
@@ -90,8 +90,8 @@ void sub_08058324(u32 unk) {
     LoadGfxGroup(unk + 0x36);
     sub_080582D0();
     sub_080582A0(sub_08058244(unk), gUnk_02006F00, gBG3Buffer);
-    gScreen.bg.bg1Control = 0x1D47;
-    gScreen.bg.bg1Tilemap = gBG3Buffer;
-    gScreen.bg.bg1Updated = 1;
+    gScreen.bg1.control = 0x1D47;
+    gScreen.bg1.tilemap = gBG3Buffer;
+    gScreen.bg1.updated = 1;
     gScreen.lcd.displayControl |= 0x200;
 }
diff --git a/src/manager/managerC.c b/src/manager/managerC.c
index e66185f7..abcb9914 100644
--- a/src/manager/managerC.c
+++ b/src/manager/managerC.c
@@ -287,10 +287,10 @@ void sub_08058D34() {
     tmp = gScreen.lcd.displayControl;
     tmp2 = 0;
     gScreen.lcd.displayControl |= 1;
-    gScreen.affine.bg2Control = 0xBC82;
-    gScreen.bg.bg1Control = 0x5E86;
-    gScreen.bg.bg1xOffset = 0;
-    gScreen.bg.bg1yOffset = tmp2;
+    gScreen.bg2.control = 0xBC82;
+    gScreen.bg1.control = 0x5E86;
+    gScreen.bg1.xOffset = 0;
+    gScreen.bg1.yOffset = tmp2;
     gScreen.controls.layerFXControl = 0x3456;
     gScreen.controls.alphaBlend = 0x909;
     gArea.musicIndex = gArea.pMusicIndex;
diff --git a/src/npc.c b/src/npc.c
index 50e4c7ff..10edf4ce 100644
--- a/src/npc.c
+++ b/src/npc.c
@@ -1,5 +1,6 @@
 #include "global.h"
 #include "entity.h"
+#include "room.h"
 #include "npc.h"
 
 //clang-format off
@@ -135,3 +136,36 @@ void (*const gNPCFunctions[][3])(Entity* ent) = {
 };
 //clang-format on
 const u8 npc_unk[] = { 0x04, 0x05, 0x06, 0x06 };
+
+extern u8 gUnk_020342F8;
+typedef struct {
+    u16 unk0;
+    u16 unk1;
+    u16 x;
+    u16 y;
+} NPCStruct;
+extern NPCStruct gUnk_02031EC0[100];
+
+void InitNPC(Entity*);
+u32 ReadBit(void*, u32);
+
+// regalloc
+NONMATCH("asm/non_matching/arm_proxy/NPCUpdate.inc", void NPCUpdate(Entity* this)) {
+    if ((this->currentHealth & 0x7f) && !ReadBit(&gUnk_020342F8, this->currentHealth - 1))
+        DeleteThisEntity();
+    if (this->action == 0 && (this->flags & ENT_DID_INIT) == 0)
+        InitNPC(this);
+    if (!CheckDontUpdate(this))
+        gNPCFunctions[this->id][0](this);
+    if (this->next != NULL) {
+        if (gNPCFunctions[this->id][1] != NULL)
+            gNPCFunctions[this->id][1](this);
+        if ((this->currentHealth & 0x7f) != 0) {
+            u32 temp = this->currentHealth & 0x7f;
+            gUnk_02031EC0[temp * 2 - 2].x = this->x.HALF.HI - gRoomControls.roomOriginX;
+            gUnk_02031EC0[temp * 2 - 2].y = this->y.HALF.HI - gRoomControls.roomOriginY;
+        }
+        DrawEntity(this);
+    }
+}
+END_NONMATCH
diff --git a/src/npc/bigGoron.c b/src/npc/bigGoron.c
index d5320463..234a3f7c 100644
--- a/src/npc/bigGoron.c
+++ b/src/npc/bigGoron.c
@@ -96,9 +96,9 @@ void sub_0806D0B0(Entity* this) {
     if (this != NULL) {
         sub_0806D164(this);
     }
-    gScreen.bg.bg1Control = 0x1d47;
-    gScreen.bg.bg1Tilemap = &gMapDataTopSpecial;
-    gScreen.bg.bg1Updated = 1;
+    gScreen.bg1.control = 0x1d47;
+    gScreen.bg1.tilemap = &gMapDataTopSpecial;
+    gScreen.bg1.updated = 1;
 }
 
 void sub_0806D0F8(void) {
diff --git a/src/npc/phonograph.c b/src/npc/phonograph.c
index 38604490..da7478a2 100644
--- a/src/npc/phonograph.c
+++ b/src/npc/phonograph.c
@@ -32,6 +32,6 @@ void sub_0806EABC(Entity* this, u32 param) {
     sub_08050384();
     sub_08057044(param, &gUnk_020227E8, 0x202020);
     sub_0805F46C(0x3302, &gUnk_081146B8);
-    gScreen.bg.bg0Updated = 1;
+    gScreen.bg0.updated = 1;
 }
 #endif
diff --git a/src/object.c b/src/object.c
index 768c8d12..497c3c37 100644
--- a/src/object.c
+++ b/src/object.c
@@ -1,5 +1,6 @@
 #include "global.h"
 #include "entity.h"
+#include "manager.h"
 #include "object.h"
 
 void (*const gObjectFunctions[])(Entity*) = {
@@ -198,3 +199,17 @@ void (*const gObjectFunctions[])(Entity*) = {
     [ENEMY_ITEM] = EnemyItem,
     [OBJECT_C1] = ObjectC1,
 };
+
+void InitObject(Entity*);
+
+void ObjectUpdate(Entity* this) {
+    if ((this->flags & ENT_DID_INIT) == 0 && this->action == 0)
+        InitObject(this);
+    if (this->iframes != 0)
+        this->iframes++;
+    if (!CheckDontUpdate(this)) {
+        gObjectFunctions[this->id](this);
+        this->bitfield &= ~0x80;
+    }
+    DrawEntity(this);
+}
diff --git a/src/playerItem.c b/src/playerItem.c
index 5a373712..c837a29a 100644
--- a/src/playerItem.c
+++ b/src/playerItem.c
@@ -23,7 +23,6 @@ extern void PlayerItem15();
 extern void PlayerItemNulled2();
 
 void (*const gPlayerItemFunctions[])() = {
-
     DeleteEntity,
     PlayerItemSword,
     PlayerItemBomb,
@@ -50,3 +49,67 @@ void (*const gPlayerItemFunctions[])() = {
     PlayerItemNulled2,
     PlayerItemCellOverwriteSet
 };
+
+typedef struct {
+    u8 unk0;
+    u8 unk1;
+    u8 unk2;
+    u8 unk3;
+    u8 unk4;
+    u8 unk5;
+    u16 unk6;
+} ItemFrame;
+extern ItemFrame gUnk_08126DA8[];
+extern ItemFrame* gUnk_08126ED8[3];
+
+void ItemInit(Entity*);
+
+void ItemUpdate(Entity* this) {
+    if ((this->flags & ENT_DID_INIT) == 0 && this->action == 0 && this->subAction == 0)
+        ItemInit(this);
+
+    if (!CheckDontUpdate(this)) {
+        gPlayerItemFunctions[this->id](this);
+        this->bitfield &= ~0x80;
+        if (this->iframes != 0) {
+            if (this->iframes > 0)
+                this->iframes--;
+            else
+                this->iframes++;
+        }
+    }
+    DrawEntity(this);
+}
+
+// tiny regalloc
+NONMATCH("asm/non_matching/arm_proxy/ItemInit.inc", void ItemInit(Entity* this)) {
+    ItemFrame* entry;
+
+    entry = &gUnk_08126DA8[this->id];
+    if (entry->unk0 == 0xff) {
+        u32 temp = entry->unk2;
+        ItemFrame* temp2 = gUnk_08126ED8[entry->unk1];
+        entry = &temp2[this->field_0x68.HALF.LO - temp];
+    }
+
+    this->palette.raw = ((entry->unk0 & 0xf) << 4) | entry->unk0;
+    this->damage = entry->unk1;
+    this->hurtType = entry->unk3;
+    this->hitType = entry->unk4;
+    this->spriteIndex = entry->unk5;
+    if (entry->unk6 == 0)
+        this->spriteVramOffset = gPlayerEntity.spriteVramOffset;
+    else
+        this->spriteVramOffset = entry->unk6 & 0x3ff;
+
+    if (this->animationState == 0)
+        this->animationState = gPlayerEntity.animationState & 6;
+
+    this->collisionLayer = gPlayerEntity.collisionLayer;
+    this->spriteRendering.b3 = gPlayerEntity.spriteRendering.b3;
+    this->spritePriority.b0 = gPlayerEntity.spritePriority.b0;
+    this->spriteOrientation.flipY = gPlayerEntity.spriteOrientation.flipY;
+    this->currentHealth = 1;
+    this->flags |= ENT_DID_INIT;
+}
+END_NONMATCH
diff --git a/src/sub_080A3B84.c b/src/sub_080A3B84.c
index 193dd12f..d3bf3363 100644
--- a/src/sub_080A3B84.c
+++ b/src/sub_080A3B84.c
@@ -46,12 +46,12 @@ void sub_080A3BD0(void) {
 
     LoadGfxGroup(iVar1 + 0x76);
     gScreen.lcd.displayControl |= 0x1e00;
-    gScreen.bg.bg1Control = 0x1c01;
-    gScreen.affine.bg2Control = 0x1d02;
-    gScreen.affine.bg3Control = 0x1e0b;
-    gScreen.bg.bg1Updated = 1;
-    gScreen.affine.bg2Updated = 1;
-    gScreen.affine.bg3Updated = 1;
+    gScreen.bg1.control = 0x1c01;
+    gScreen.bg2.control = 0x1d02;
+    gScreen.bg3.control = 0x1e0b;
+    gScreen.bg1.updated = 1;
+    gScreen.bg2.updated = 1;
+    gScreen.bg3.updated = 1;
     sub_080A4528();
     sub_080A4398();
     sub_0801E738(0);