Document field_door code

7 files changed, 198 insertions, 540 deletions

diff --git a/asm/field_camera.s b/asm/field_camera.s
index f6cbbd0ef..0016e6381 100644
--- a/asm/field_camera.s
+++ b/asm/field_camera.s
@@ -490,8 +490,8 @@ _0805A914: .4byte gUnknown_3000E90
 _0805A918: .4byte gMapHeader
 	thumb_func_end CurrentMapDrawMetatileAt
 
-	thumb_func_start sub_805A91C
-sub_805A91C: @ 805A91C
+	thumb_func_start DrawDoorMetatileAt
+DrawDoorMetatileAt: @ 805A91C
 	push {r4,r5,lr}
 	adds r3, r0, 0
 	adds r4, r1, 0
@@ -513,7 +513,7 @@ _0805A93E:
 	bx r0
 	.align 2, 0
 _0805A944: .4byte gUnknown_3000E90
-	thumb_func_end sub_805A91C
+	thumb_func_end DrawDoorMetatileAt
 
 	thumb_func_start sub_805A948
 sub_805A948: @ 805A948
diff --git a/asm/field_door.s b/asm/field_door.s
deleted file mode 100644
index b4541ffaf..000000000
--- a/asm/field_door.s
+++ /dev/null
@@ -1,484 +0,0 @@
-	.include "asm/macros.inc"
-	.include "constants/constants.inc"
-
-	.syntax unified
-
-	.text
-
-	thumb_func_start sub_805B060
-sub_805B060: @ 805B060
-	push {r4-r6,lr}
-	adds r6, r0, 0
-	adds r5, r1, 0
-	adds r4, r2, 0
-	movs r1, 0xA
-	ldrsh r0, [r4, r1]
-	cmp r0, 0
-	bne _0805B086
-	movs r2, 0x8
-	ldrsh r1, [r4, r2]
-	lsls r1, 2
-	adds r1, r5, r1
-	movs r0, 0xC
-	ldrsh r2, [r4, r0]
-	movs r0, 0xE
-	ldrsh r3, [r4, r0]
-	adds r0, r6, 0
-	bl sub_805AF14
-_0805B086:
-	movs r2, 0xA
-	ldrsh r1, [r4, r2]
-	movs r2, 0x8
-	ldrsh r0, [r4, r2]
-	lsls r0, 2
-	adds r0, r5
-	ldrb r0, [r0]
-	cmp r1, r0
-	bne _0805B0B4
-	movs r0, 0
-	strh r0, [r4, 0xA]
-	ldrh r0, [r4, 0x8]
-	adds r0, 0x1
-	strh r0, [r4, 0x8]
-	movs r1, 0x8
-	ldrsh r0, [r4, r1]
-	lsls r0, 2
-	adds r0, r5
-	ldrb r0, [r0]
-	cmp r0, 0
-	bne _0805B0BA
-	movs r0, 0
-	b _0805B0BC
-_0805B0B4:
-	ldrh r0, [r4, 0xA]
-	adds r0, 0x1
-	strh r0, [r4, 0xA]
-_0805B0BA:
-	movs r0, 0x1
-_0805B0BC:
-	pop {r4-r6}
-	pop {r1}
-	bx r1
-	thumb_func_end sub_805B060
-
-	thumb_func_start door_find
-door_find: @ 805B0C4
-	push {lr}
-	adds r2, r0, 0
-	lsls r1, 16
-	lsrs r1, 16
-	b _0805B0DA
-_0805B0CE:
-	ldrh r0, [r2]
-	cmp r0, r1
-	bne _0805B0D8
-	adds r0, r2, 0
-	b _0805B0E2
-_0805B0D8:
-	adds r2, 0xC
-_0805B0DA:
-	ldr r0, [r2, 0x4]
-	cmp r0, 0
-	bne _0805B0CE
-	movs r0, 0
-_0805B0E2:
-	pop {r1}
-	bx r1
-	thumb_func_end door_find
-
-	thumb_func_start task_overworld_door_add_if_inactive
-task_overworld_door_add_if_inactive: @ 805B0E8
-	push {r4-r7,lr}
-	mov r7, r8
-	push {r7}
-	adds r6, r0, 0
-	adds r5, r1, 0
-	adds r7, r2, 0
-	mov r8, r3
-	ldr r4, _0805B134 @ =sub_805B028
-	adds r0, r4, 0
-	bl FuncIsActiveTask
-	lsls r0, 24
-	lsrs r0, 24
-	cmp r0, 0x1
-	beq _0805B13C
-	adds r0, r4, 0
-	movs r1, 0x50
-	bl CreateTask
-	lsls r0, 24
-	lsrs r0, 24
-	lsls r1, r0, 2
-	adds r1, r0
-	lsls r1, 3
-	ldr r2, _0805B138 @ =gTasks+0x8
-	adds r1, r2
-	strh r7, [r1, 0xC]
-	mov r2, r8
-	strh r2, [r1, 0xE]
-	strh r5, [r1, 0x2]
-	lsrs r2, r5, 16
-	strh r2, [r1]
-	strh r6, [r1, 0x6]
-	lsrs r2, r6, 16
-	strh r2, [r1, 0x4]
-	lsls r0, 24
-	asrs r0, 24
-	b _0805B140
-	.align 2, 0
-_0805B134: .4byte sub_805B028
-_0805B138: .4byte gTasks+0x8
-_0805B13C:
-	movs r0, 0x1
-	negs r0, r0
-_0805B140:
-	pop {r3}
-	mov r8, r3
-	pop {r4-r7}
-	pop {r1}
-	bx r1
-	thumb_func_end task_overworld_door_add_if_inactive
-
-	thumb_func_start DrawClosedDoor
-DrawClosedDoor: @ 805B14C
-	push {lr}
-	bl sub_805AF54
-	pop {r0}
-	bx r0
-	thumb_func_end DrawClosedDoor
-
-	thumb_func_start sub_805B158
-sub_805B158: @ 805B158
-	push {r4-r6,lr}
-	adds r4, r0, 0
-	adds r5, r1, 0
-	adds r6, r2, 0
-	adds r0, r5, 0
-	adds r1, r6, 0
-	bl MapGridGetMetatileIdAt
-	adds r1, r0, 0
-	lsls r1, 16
-	lsrs r1, 16
-	adds r0, r4, 0
-	bl door_find
-	adds r4, r0, 0
-	cmp r0, 0
-	beq _0805B196
-	ldrb r0, [r0, 0x3]
-	ldr r1, _0805B19C @ =gUnknown_835B49C
-	cmp r0, 0
-	bne _0805B184
-	ldr r1, _0805B1A0 @ =gUnknown_835B488
-_0805B184:
-	adds r0, r1, 0
-	bl sub_805B1A4
-	adds r1, r0, 0
-	adds r0, r4, 0
-	adds r2, r5, 0
-	adds r3, r6, 0
-	bl sub_805AF14
-_0805B196:
-	pop {r4-r6}
-	pop {r0}
-	bx r0
-	.align 2, 0
-_0805B19C: .4byte gUnknown_835B49C
-_0805B1A0: .4byte gUnknown_835B488
-	thumb_func_end sub_805B158
-
-	thumb_func_start sub_805B1A4
-sub_805B1A4: @ 805B1A4
-	push {lr}
-	adds r1, r0, 0
-	b _0805B1AC
-_0805B1AA:
-	adds r1, 0x4
-_0805B1AC:
-	ldrb r0, [r1]
-	cmp r0, 0
-	bne _0805B1AA
-	subs r0, r1, 0x4
-	pop {r1}
-	bx r1
-	thumb_func_end sub_805B1A4
-
-	thumb_func_start sub_805B1B8
-sub_805B1B8: @ 805B1B8
-	push {r4-r6,lr}
-	adds r4, r0, 0
-	adds r5, r1, 0
-	adds r6, r2, 0
-	adds r0, r5, 0
-	adds r1, r6, 0
-	bl MapGridGetMetatileIdAt
-	adds r1, r0, 0
-	lsls r1, 16
-	lsrs r1, 16
-	adds r0, r4, 0
-	bl door_find
-	adds r2, r0, 0
-	adds r4, r2, 0
-	cmp r2, 0
-	bne _0805B1E2
-	movs r0, 0x1
-	negs r0, r0
-	b _0805B204
-_0805B1E2:
-	ldrb r0, [r2, 0x3]
-	cmp r0, 0
-	beq _0805B1F4
-	ldr r1, _0805B1F0 @ =gUnknown_835B49C
-	adds r0, r2, 0
-	b _0805B1F8
-	.align 2, 0
-_0805B1F0: .4byte gUnknown_835B49C
-_0805B1F4:
-	ldr r1, _0805B20C @ =gUnknown_835B488
-	adds r0, r4, 0
-_0805B1F8:
-	adds r2, r5, 0
-	adds r3, r6, 0
-	bl task_overworld_door_add_if_inactive
-	lsls r0, 24
-	asrs r0, 24
-_0805B204:
-	pop {r4-r6}
-	pop {r1}
-	bx r1
-	.align 2, 0
-_0805B20C: .4byte gUnknown_835B488
-	thumb_func_end sub_805B1B8
-
-	thumb_func_start sub_805B210
-sub_805B210: @ 805B210
-	push {r4-r6,lr}
-	adds r4, r0, 0
-	adds r5, r1, 0
-	adds r6, r2, 0
-	adds r0, r5, 0
-	adds r1, r6, 0
-	bl MapGridGetMetatileIdAt
-	adds r1, r0, 0
-	lsls r1, 16
-	lsrs r1, 16
-	adds r0, r4, 0
-	bl door_find
-	adds r2, r0, 0
-	adds r4, r2, 0
-	cmp r2, 0
-	bne _0805B23A
-	movs r0, 0x1
-	negs r0, r0
-	b _0805B25C
-_0805B23A:
-	ldrb r0, [r2, 0x3]
-	cmp r0, 0
-	beq _0805B24C
-	ldr r1, _0805B248 @ =gUnknown_835B4C4
-	adds r0, r2, 0
-	b _0805B250
-	.align 2, 0
-_0805B248: .4byte gUnknown_835B4C4
-_0805B24C:
-	ldr r1, _0805B264 @ =gUnknown_835B4B0
-	adds r0, r4, 0
-_0805B250:
-	adds r2, r5, 0
-	adds r3, r6, 0
-	bl task_overworld_door_add_if_inactive
-	lsls r0, 24
-	asrs r0, 24
-_0805B25C:
-	pop {r4-r6}
-	pop {r1}
-	bx r1
-	.align 2, 0
-_0805B264: .4byte gUnknown_835B4B0
-	thumb_func_end sub_805B210
-
-	thumb_func_start FieldSetDoorOpened
-FieldSetDoorOpened: @ 805B268
-	push {r4,r5,lr}
-	adds r4, r0, 0
-	adds r5, r1, 0
-	lsls r0, r4, 16
-	asrs r0, 16
-	lsls r1, r5, 16
-	asrs r1, 16
-	bl MapGridGetMetatileBehaviorAt
-	lsls r0, 24
-	lsrs r0, 24
-	bl MetatileBehavior_IsWarpDoor_2
-	lsls r0, 24
-	cmp r0, 0
-	beq _0805B292
-	ldr r0, _0805B298 @ =gUnknown_835B5D8
-	adds r1, r4, 0
-	adds r2, r5, 0
-	bl sub_805B158
-_0805B292:
-	pop {r4,r5}
-	pop {r0}
-	bx r0
-	.align 2, 0
-_0805B298: .4byte gUnknown_835B5D8
-	thumb_func_end FieldSetDoorOpened
-
-	thumb_func_start FieldSetDoorClosed
-FieldSetDoorClosed: @ 805B29C
-	push {r4,r5,lr}
-	adds r4, r0, 0
-	adds r5, r1, 0
-	lsls r0, r4, 16
-	asrs r0, 16
-	lsls r1, r5, 16
-	asrs r1, 16
-	bl MapGridGetMetatileBehaviorAt
-	lsls r0, 24
-	lsrs r0, 24
-	bl MetatileBehavior_IsWarpDoor_2
-	lsls r0, 24
-	cmp r0, 0
-	beq _0805B2C6
-	ldr r0, _0805B2CC @ =gUnknown_835B5D8
-	adds r1, r4, 0
-	adds r2, r5, 0
-	bl DrawClosedDoor
-_0805B2C6:
-	pop {r4,r5}
-	pop {r0}
-	bx r0
-	.align 2, 0
-_0805B2CC: .4byte gUnknown_835B5D8
-	thumb_func_end FieldSetDoorClosed
-
-	thumb_func_start FieldAnimateDoorClose
-FieldAnimateDoorClose: @ 805B2D0
-	push {r4,r5,lr}
-	adds r4, r0, 0
-	adds r5, r1, 0
-	lsls r0, r4, 16
-	asrs r0, 16
-	lsls r1, r5, 16
-	asrs r1, 16
-	bl MapGridGetMetatileBehaviorAt
-	lsls r0, 24
-	lsrs r0, 24
-	bl MetatileBehavior_IsWarpDoor_2
-	lsls r0, 24
-	cmp r0, 0
-	beq _0805B304
-	ldr r0, _0805B300 @ =gUnknown_835B5D8
-	adds r1, r4, 0
-	adds r2, r5, 0
-	bl sub_805B210
-	lsls r0, 24
-	asrs r0, 24
-	b _0805B308
-	.align 2, 0
-_0805B300: .4byte gUnknown_835B5D8
-_0805B304:
-	movs r0, 0x1
-	negs r0, r0
-_0805B308:
-	pop {r4,r5}
-	pop {r1}
-	bx r1
-	thumb_func_end FieldAnimateDoorClose
-
-	thumb_func_start FieldAnimateDoorOpen
-FieldAnimateDoorOpen: @ 805B310
-	push {r4,r5,lr}
-	adds r4, r0, 0
-	adds r5, r1, 0
-	lsls r0, r4, 16
-	asrs r0, 16
-	lsls r1, r5, 16
-	asrs r1, 16
-	bl MapGridGetMetatileBehaviorAt
-	lsls r0, 24
-	lsrs r0, 24
-	bl MetatileBehavior_IsWarpDoor_2
-	lsls r0, 24
-	cmp r0, 0
-	beq _0805B344
-	ldr r0, _0805B340 @ =gUnknown_835B5D8
-	adds r1, r4, 0
-	adds r2, r5, 0
-	bl sub_805B1B8
-	lsls r0, 24
-	asrs r0, 24
-	b _0805B348
-	.align 2, 0
-_0805B340: .4byte gUnknown_835B5D8
-_0805B344:
-	movs r0, 0x1
-	negs r0, r0
-_0805B348:
-	pop {r4,r5}
-	pop {r1}
-	bx r1
-	thumb_func_end FieldAnimateDoorOpen
-
-	thumb_func_start FieldIsDoorAnimationRunning
-FieldIsDoorAnimationRunning: @ 805B350
-	push {lr}
-	ldr r0, _0805B360 @ =sub_805B028
-	bl FuncIsActiveTask
-	lsls r0, 24
-	lsrs r0, 24
-	pop {r1}
-	bx r1
-	.align 2, 0
-_0805B360: .4byte sub_805B028
-	thumb_func_end FieldIsDoorAnimationRunning
-
-	thumb_func_start GetDoorSoundEffect
-GetDoorSoundEffect: @ 805B364
-	push {lr}
-	adds r3, r0, 0
-	adds r2, r1, 0
-	ldr r0, _0805B37C @ =gUnknown_835B5D8
-	adds r1, r3, 0
-	bl sub_805B388
-	lsls r0, 24
-	cmp r0, 0
-	beq _0805B380
-	movs r0, 0x12
-	b _0805B382
-	.align 2, 0
-_0805B37C: .4byte gUnknown_835B5D8
-_0805B380:
-	movs r0, 0xF1
-_0805B382:
-	pop {r1}
-	bx r1
-	thumb_func_end GetDoorSoundEffect
-
-	thumb_func_start sub_805B388
-sub_805B388: @ 805B388
-	push {r4,lr}
-	adds r4, r0, 0
-	adds r0, r1, 0
-	adds r1, r2, 0
-	bl MapGridGetMetatileIdAt
-	adds r1, r0, 0
-	lsls r1, 16
-	lsrs r1, 16
-	adds r0, r4, 0
-	bl door_find
-	cmp r0, 0
-	beq _0805B3AC
-	ldrb r0, [r0, 0x2]
-	lsls r0, 24
-	asrs r0, 24
-	b _0805B3B0
-_0805B3AC:
-	movs r0, 0x1
-	negs r0, r0
-_0805B3B0:
-	pop {r4}
-	pop {r1}
-	bx r1
-	thumb_func_end sub_805B388
-
-	.align 2, 0 @ Don't pad with nop.
diff --git a/data/field_door.s b/data/field_door.s
index be76e845d..c26398742 100644
--- a/data/field_door.s
+++ b/data/field_door.s
@@ -247,7 +247,7 @@ gUnknown_835B168:: @ 835B168
 	.space 32
 
 	.align 2
-gUnknown_835B488:: @ 835B488
+sDoorAnimFrames_OpenSmall:: @ 835B488
 	.byte 0x04
 	.align 1
 	.2byte 0xffff
@@ -264,7 +264,7 @@ gUnknown_835B488:: @ 835B488
 	.align 1
 	.2byte 0x0000
 
-gUnknown_835B49C:: @ 835B49C
+sDoorAnimFrames_OpenLarge:: @ 835B49C
 	.byte 0x04
 	.align 1
 	.2byte 0xffff
@@ -281,7 +281,7 @@ gUnknown_835B49C:: @ 835B49C
 	.align 1
 	.2byte 0x0000
 
-gUnknown_835B4B0:: @ 835B4B0
+sDoorAnimFrames_CloseSmall:: @ 835B4B0
 	.byte 0x04
 	.align 1
 	.2byte 0x0100
@@ -298,7 +298,7 @@ gUnknown_835B4B0:: @ 835B4B0
 	.align 1
 	.2byte 0x0000
 
-gUnknown_835B4C4:: @ 835B4C4
+sDoorAnimFrames_CloseLarge:: @ 835B4C4
 	.byte 0x04
 	.align 1
 	.2byte 0x0200
@@ -411,7 +411,7 @@ gUnknown_835B5C8:: @ 835B5C8
 gUnknown_835B5D0:: @ 835B5D0
 	.byte 0xb, 0xb, 0x2, 0x2, 0x2, 0x2, 0x2, 0x2
 
-gUnknown_835B5D8:: @ 835B5D8
+sDoorGraphics:: @ 835B5D8
 	.2byte 0x003d
 	.byte 0x00, 0x00
 	.4byte gUnknown_8353088
diff --git a/include/field_camera.h b/include/field_camera.h
index 2ba583a52..fb9861014 100644
--- a/include/field_camera.h
+++ b/include/field_camera.h
@@ -30,6 +30,6 @@ void sub_805A658(s16 *x, s16 *y);
 void SetCameraPanningCallback(void (*cb)(void));
 void SetCameraPanning(s16 x, s16 y);
 void InstallCameraPanAheadCallback(void);
-void sub_805A91C(int x, int y, const u16 *data);
+void DrawDoorMetatileAt(int x, int y, const u16 *data);
 
 #endif //GUARD_FIELD_CAMERA_H
diff --git a/include/field_door.h b/include/field_door.h
index 0059cbe1a..777afffce 100644
--- a/include/field_door.h
+++ b/include/field_door.h
@@ -3,11 +3,11 @@
 
 #include "global.h"
 
-void FieldSetDoorOpened(u32, u32);
-void FieldSetDoorClosed(u32, u32);
-s8 FieldAnimateDoorClose(u32, u32);
-s8 FieldAnimateDoorOpen(u32, u32);
+void FieldSetDoorOpened(int x, int y);
+void FieldSetDoorClosed(int x, int y);
+s8 FieldAnimateDoorClose(int x, int y);
+s8 FieldAnimateDoorOpen(int x, int y);
 bool8 FieldIsDoorAnimationRunning(void);
-u32 GetDoorSoundEffect(u32 x, u32 y);
+u16 GetDoorSoundEffect(int x, int y);
 
 #endif
diff --git a/ld_script.txt b/ld_script.txt
index fe60a90e3..9066a11de 100644
--- a/ld_script.txt
+++ b/ld_script.txt
@@ -94,7 +94,6 @@ SECTIONS {
         src/metatile_behavior.o(.text);
         asm/field_camera.o(.text);
         src/field_door.o(.text);
-        asm/field_door.o(.text);
         asm/field_player_avatar.o(.text);
         asm/field_map_obj.o(.text);
         asm/field_ground_effect.o(.text);
diff --git a/src/field_door.c b/src/field_door.c
index 116cdddee..a0b470c58 100644
--- a/src/field_door.c
+++ b/src/field_door.c
@@ -1,82 +1,87 @@
 #include "global.h"
 #include "field_camera.h"
 #include "task.h"
+#include "fieldmap.h"
+#include "metatile_behavior.h"
+#include "constants/songs.h"
 
 struct DoorAnimFrame
 {
-    u8 unk_0;
-    u16 unk_2;
+    u8 duration;
+    u16 tile;
 };
 
 struct DoorGraphics
 {
-    u16 unk_0;
-    u8 unk_2;
-    u8 unk_3;
-    const u8 * unk_4;
-    const u8 * unk_8;
+    u16 metatileId;
+    s8 sliding;
+    u8 size;
+    const u8 * tiles;
+    const u8 * palettes;
 };
 
-void sub_805AF54(const struct DoorGraphics * a0, int a1, int a2);
-void sub_805AF80(const u8 *a0);
-void sub_805AF94(const struct DoorGraphics * a0, int a1, int a2, const u8 *a3);
-void sub_805AFE8(u16 *a0, u16 a1, const u8 *a2);
-bool32 sub_805B060(const struct DoorGraphics * gfx, const struct DoorAnimFrame * frames, u16 *data);
+static void DrawDoorDefaultImage(const struct DoorGraphics * gfx, int x, int y);
+static void LoadDoorFrameTiles(const u8 *a0);
+static void SetDoorFramePalettes(const struct DoorGraphics * gfx, int x, int y, const u8 *a3);
+static void BufferDoorFrameTilesWithPalettes(u16 *a0, u16 a1, const u8 *a2);
+static bool32 PlayDoorAnimationFrame(const struct DoorGraphics * gfx, const struct DoorAnimFrame * frames, s16 *data);
+static const struct DoorAnimFrame * SeekToEndOfDoorAnim(const struct DoorAnimFrame * frames);
+static s8 GetDoorOpenType(const struct DoorGraphics * gfx, int x, int y);
 
-extern const struct DoorAnimFrame gUnknown_835B488[];
-extern const struct DoorAnimFrame gUnknown_835B49C[];
-extern const struct DoorAnimFrame gUnknown_835B4B0[];
-extern const struct DoorAnimFrame gUnknown_835B4C4[];
-extern const struct DoorGraphics gUnknown_835B5D8[];
+extern const struct DoorAnimFrame sDoorAnimFrames_OpenSmall[];
+extern const struct DoorAnimFrame sDoorAnimFrames_OpenLarge[];
+extern const struct DoorAnimFrame sDoorAnimFrames_CloseSmall[];
+extern const struct DoorAnimFrame sDoorAnimFrames_CloseLarge[];
+extern const struct DoorGraphics sDoorGraphics[];
 
-void sub_805AF14(const struct DoorGraphics * a0, const struct DoorAnimFrame * a1, int a2, int a3)
+static void UpdateDrawDoorFrame(const struct DoorGraphics * gfx, const struct DoorAnimFrame * frames, int x, int y)
 {
-    if (a1->unk_2 == 0xFFFF)
+    if (frames->tile == 0xFFFF)
     {
-        sub_805AF54(a0, a2, a3);
+        DrawDoorDefaultImage(gfx, x, y);
     }
     else
     {
-        sub_805AF80(&a0->unk_4[a1->unk_2]);
-        sub_805AF94(a0, a2, a3, a0->unk_8);
+        LoadDoorFrameTiles(&gfx->tiles[frames->tile]);
+        SetDoorFramePalettes(gfx, x, y, gfx->palettes);
     }
 }
 
-void sub_805AF54(const struct DoorGraphics * a0, int a1, int a2)
+static void DrawDoorDefaultImage(const struct DoorGraphics * gfx, int x, int y)
 {
-    if (a0->unk_3 == 0)
+    if (gfx->size == 0)
     {
-        CurrentMapDrawMetatileAt(a1, a2);
+        CurrentMapDrawMetatileAt(x, y);
     }
     else
     {
-        CurrentMapDrawMetatileAt(a1, a2);
-        CurrentMapDrawMetatileAt(a1, a2 - 1);
+        CurrentMapDrawMetatileAt(x, y);
+        CurrentMapDrawMetatileAt(x, y - 1);
     }
 }
 
-void sub_805AF80(const u8 *a0)
+static void LoadDoorFrameTiles(const u8 *a0)
 {
     CpuFastCopy(a0, (void *)(BG_VRAM + 0x7F00), 0x100);
 }
 
-void sub_805AF94(const struct DoorGraphics * a0, int a1, int a2, const u8 *a3)
+static void SetDoorFramePalettes(const struct DoorGraphics * gfx, int x, int y, const u8 *a3)
 {
     u16 sp00[8];
-    if (a0->unk_3 == 0)
+    if (gfx->size == 0)
     {
-        sub_805AFE8(sp00, 0x3F8, a3);
+        BufferDoorFrameTilesWithPalettes(sp00, 0x3F8, a3);
     }
     else
     {
-        sub_805AFE8(sp00, 0x3F8, a3);
-        sub_805A91C(a1, a2 - 1, sp00);
-        sub_805AFE8(sp00, 0x3FC, a3 + 4);
+        BufferDoorFrameTilesWithPalettes(sp00, 0x3F8, a3);
+        DrawDoorMetatileAt(x, y - 1, sp00);
+        BufferDoorFrameTilesWithPalettes(sp00, 0x3FC, a3 + 4);
     }
-    sub_805A91C(a1, a2, sp00);
+    DrawDoorMetatileAt(x, y, sp00);
 }
 
-void sub_805AFE8(u16 *a0, u16 a1, const u8 *a2)
+static void BufferDoorFrameTilesWithPalettes(u16 *a0, u16 a1, const u8 *a2)
 {
     int i;
     u16 tile;
@@ -92,11 +97,149 @@ void sub_805AFE8(u16 *a0, u16 a1, const u8 *a2)
     }
 }
 
-void sub_805B028(u8 taskId)
+static void Task_AnimateDoor(u8 taskId)
 {
-    u16 *data = (void *)gTasks[taskId].data;
-    const struct DoorAnimFrame * frames = (const void *)((data[0] << 16) | data[1]);
-    const struct DoorGraphics * gfx = (const void *)((data[2] << 16) | data[3]);
-    if (!sub_805B060(gfx, frames, data))
+    s16 *data = (void *)gTasks[taskId].data;
+    const struct DoorAnimFrame * frames = (const void *)(((u16)data[0] << 16) | (u16)data[1]);
+    const struct DoorGraphics * gfx = (const void *)(((u16)data[2] << 16) | (u16)data[3]);
+    if (!PlayDoorAnimationFrame(gfx, frames, data))
         DestroyTask(taskId);
 }
+
+static bool32 PlayDoorAnimationFrame(const struct DoorGraphics * gfx, const struct DoorAnimFrame * frames, s16 *data)
+{
+    if (data[5] == 0)
+    {
+        UpdateDrawDoorFrame(gfx, &frames[data[4]], data[6], data[7]);
+    }
+    if (data[5] == frames[data[4]].duration)
+    {
+        data[5] = 0;
+        data[4]++;
+        if (frames[data[4]].duration == 0)
+            return FALSE;
+    }
+    else
+    {
+        data[5]++;
+    }
+    return TRUE;
+}
+
+static const struct DoorGraphics * door_find(const struct DoorGraphics * gfx, u16 id)
+{
+    while (gfx->tiles != NULL)
+    {
+        if (gfx->metatileId == id)
+            return gfx;
+        gfx++;
+    }
+    return NULL;
+}
+
+static s8 task_overworld_door_add_if_inactive(const struct DoorGraphics * gfx, const struct DoorAnimFrame * frames, int a2, int a3)
+{
+    u8 taskId;
+    s16 *data;
+    if (FuncIsActiveTask(Task_AnimateDoor) == TRUE)
+        return -1;
+    taskId = CreateTask(Task_AnimateDoor, 80);
+    data = gTasks[taskId].data;
+    data[6] = a2;
+    data[7] = a3;
+    data[1] = (uintptr_t)frames;
+    data[0] = (uintptr_t)frames >> 16;
+    data[3] = (uintptr_t)gfx;
+    data[2] = (uintptr_t)gfx >> 16;
+    return taskId;
+}
+
+static void DrawClosedDoor(const struct DoorGraphics * gfx, int a1, int a2)
+{
+    DrawDoorDefaultImage(gfx, a1, a2);
+}
+
+static void DrawOpenedDoor(const struct DoorGraphics * gfx, int x, int y)
+{
+    gfx = door_find(gfx, MapGridGetMetatileIdAt(x, y));
+    if (gfx != NULL)
+    {
+        UpdateDrawDoorFrame(gfx, SeekToEndOfDoorAnim(gfx->size == 0 ? sDoorAnimFrames_OpenSmall : sDoorAnimFrames_OpenLarge), x, y);
+    }
+}
+
+static const struct DoorAnimFrame * SeekToEndOfDoorAnim(const struct DoorAnimFrame * frames)
+{
+    while (frames->duration != 0)
+        frames++;
+    return frames - 1;
+}
+
+static s8 AnimateDoorOpenInternal(const struct DoorGraphics * gfx, int x, int y)
+{
+    gfx = door_find(gfx, MapGridGetMetatileIdAt(x, y));
+    if (gfx == NULL)
+        return -1;
+    else if (gfx->size == 0)
+        return task_overworld_door_add_if_inactive(gfx, sDoorAnimFrames_OpenSmall, x, y);
+    else
+        return task_overworld_door_add_if_inactive(gfx, sDoorAnimFrames_OpenLarge, x, y);
+}
+
+static s8 AnimateDoorCloseInternal(const struct DoorGraphics * gfx, int x, int y)
+{
+    gfx = door_find(gfx, MapGridGetMetatileIdAt(x, y));
+    if (gfx == NULL)
+        return -1;
+    else if (gfx->size == 0)
+        return task_overworld_door_add_if_inactive(gfx, sDoorAnimFrames_CloseSmall, x, y);
+    else
+        return task_overworld_door_add_if_inactive(gfx, sDoorAnimFrames_CloseLarge, x, y);
+}
+
+void FieldSetDoorOpened(int x, int y)
+{
+    if (MetatileBehavior_IsWarpDoor_2(MapGridGetMetatileBehaviorAt((s16)x, (s16)y)))
+        DrawOpenedDoor(sDoorGraphics, x, y);
+}
+
+void FieldSetDoorClosed(int x, int y)
+{
+    if (MetatileBehavior_IsWarpDoor_2(MapGridGetMetatileBehaviorAt((s16)x, (s16)y)))
+        DrawClosedDoor(sDoorGraphics, x, y);
+}
+
+s8 FieldAnimateDoorClose(int x, int y)
+{
+    if (!MetatileBehavior_IsWarpDoor_2(MapGridGetMetatileBehaviorAt((s16)x, (s16)y)))
+        return -1;
+    return AnimateDoorCloseInternal(sDoorGraphics, x, y);
+}
+
+s8 FieldAnimateDoorOpen(int x, int y)
+{
+    if (!MetatileBehavior_IsWarpDoor_2(MapGridGetMetatileBehaviorAt((s16)x, (s16)y)))
+        return -1;
+    return AnimateDoorOpenInternal(sDoorGraphics, x, y);
+}
+
+bool8 FieldIsDoorAnimationRunning(void)
+{
+    return FuncIsActiveTask(Task_AnimateDoor);
+}
+
+u16 GetDoorSoundEffect(x, y)
+{
+    if (!GetDoorOpenType(sDoorGraphics, x, y))
+        return MUS_W_DOOR;
+    else
+        return SE_JIDO_DOA;
+}
+
+static s8 GetDoorOpenType(const struct DoorGraphics * gfx, int x, int y)
+{
+    gfx = door_find(gfx, MapGridGetMetatileIdAt(x, y));
+    if (gfx == NULL)
+        return -1;
+    return gfx->sliding;
+}