ported some of field_effect_helpers

5 files changed, 576 insertions, 1702 deletions

diff --git a/asm/field_effect_helpers.s b/asm/field_effect_helpers.s
index 9a019f60c..050d6b543 100644
--- a/asm/field_effect_helpers.s
+++ b/asm/field_effect_helpers.s
@@ -5,1699 +5,6 @@
 
 	.text
 
-	thumb_func_start SetUpReflection
-SetUpReflection: @ 8153ED4
-	push {r4-r7,lr}
-	mov r7, r8
-	push {r7}
-	adds r6, r0, 0
-	adds r4, r1, 0
-	lsls r5, r2, 24
-	lsrs r5, 24
-	movs r0, 0x20
-	ldrsh r1, [r4, r0]
-	movs r0, 0x22
-	ldrsh r2, [r4, r0]
-	adds r0, r4, 0
-	movs r3, 0x98
-	bl CreateCopySpriteAt
-	lsls r0, 24
-	lsrs r0, 24
-	lsls r1, r0, 4
-	adds r1, r0
-	lsls r1, 2
-	ldr r0, =gSprites
-	adds r7, r1, r0
-	ldr r0, =objc_reflection_maybe
-	str r0, [r7, 0x1C]
-	ldrb r1, [r7, 0x5]
-	movs r0, 0xC
-	orrs r1, r0
-	strb r1, [r7, 0x5]
-	ldr r2, =gReflectionEffectPaletteMap
-	lsrs r0, r1, 4
-	adds r0, r2
-	ldrb r0, [r0]
-	lsls r0, 4
-	movs r2, 0xF
-	ands r1, r2
-	orrs r1, r0
-	strb r1, [r7, 0x5]
-	movs r1, 0x3F
-	adds r1, r7
-	mov r8, r1
-	ldrb r0, [r1]
-	movs r1, 0x40
-	orrs r0, r1
-	mov r1, r8
-	strb r0, [r1]
-	ldr r0, =gDummySpriteAnimTable
-	str r0, [r7, 0x8]
-	adds r0, r7, 0
-	movs r1, 0
-	bl StartSpriteAnim
-	ldr r0, =gDummySpriteAffineAnimTable
-	str r0, [r7, 0x10]
-	mov r1, r8
-	ldrb r0, [r1]
-	movs r1, 0x8
-	orrs r0, r1
-	mov r1, r8
-	strb r0, [r1]
-	adds r2, r7, 0
-	adds r2, 0x42
-	ldrb r1, [r2]
-	movs r0, 0x3F
-	ands r0, r1
-	strb r0, [r2]
-	ldrh r0, [r4, 0x2E]
-	strh r0, [r7, 0x2E]
-	ldrb r0, [r6, 0x8]
-	strh r0, [r7, 0x30]
-	strh r5, [r7, 0x3C]
-	adds r0, r6, 0
-	adds r1, r7, 0
-	bl npc_pal_op
-	cmp r5, 0
-	bne _08153F7A
-	ldrb r0, [r7, 0x1]
-	movs r1, 0x4
-	negs r1, r1
-	ands r1, r0
-	movs r0, 0x1
-	orrs r1, r0
-	strb r1, [r7, 0x1]
-_08153F7A:
-	pop {r3}
-	mov r8, r3
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end SetUpReflection
-
-	thumb_func_start sub_8153F98
-sub_8153F98: @ 8153F98
-	push {lr}
-	ldrb r0, [r0, 0x5]
-	bl GetEventObjectGraphicsInfo
-	ldrh r0, [r0, 0xA]
-	subs r0, 0x2
-	lsls r0, 16
-	asrs r0, 16
-	pop {r1}
-	bx r1
-	thumb_func_end sub_8153F98
-
-	thumb_func_start npc_pal_op
-@ void npc_pal_op(struct npc_state *npcState, struct obj *obj)
-npc_pal_op: @ 8153FAC
-	push {r4,r5,lr}
-	sub sp, 0x8
-	adds r5, r0, 0
-	adds r4, r1, 0
-	ldr r1, =gUnknown_085CDC38
-	mov r0, sp
-	movs r2, 0x6
-	bl memcpy
-	movs r0, 0
-	strh r0, [r4, 0x32]
-	ldrb r0, [r5, 0x5]
-	bl GetEventObjectGraphicsInfo
-	ldrb r1, [r0, 0xC]
-	movs r0, 0x80
-	ands r0, r1
-	cmp r0, 0
-	bne _08154008
-	ldrb r0, [r5, 0x1F]
-	bl MetatileBehavior_GetBridgeSth
-	lsls r0, 24
-	lsrs r0, 24
-	cmp r0, 0
-	bne _08153FEE
-	ldrb r0, [r5, 0x1E]
-	bl MetatileBehavior_GetBridgeSth
-	lsls r0, 24
-	lsrs r0, 24
-	cmp r0, 0
-	beq _08154008
-_08153FEE:
-	subs r0, 0x1
-	lsls r0, 1
-	add r0, sp
-	ldrh r0, [r0]
-	strh r0, [r4, 0x32]
-	ldrb r1, [r4, 0x5]
-	lsrs r1, 4
-	adds r0, r5, 0
-	bl npc_pal_op_A
-	b _08154012
-	.pool
-_08154008:
-	ldrb r1, [r4, 0x5]
-	lsrs r1, 4
-	adds r0, r5, 0
-	bl npc_pal_op_B
-_08154012:
-	add sp, 0x8
-	pop {r4,r5}
-	pop {r0}
-	bx r0
-	thumb_func_end npc_pal_op
-
-	thumb_func_start npc_pal_op_B
-@ void npc_pal_op_B(void *a1, u8 slot)
-npc_pal_op_B: @ 815401C
-	push {r4,lr}
-	lsls r1, 24
-	lsrs r4, r1, 24
-	ldrb r0, [r0, 0x5]
-	bl GetEventObjectGraphicsInfo
-	adds r2, r0, 0
-	ldrh r1, [r2, 0x4]
-	ldr r0, =0x000011ff
-	cmp r1, r0
-	beq _08154070
-	ldrb r0, [r2, 0xC]
-	movs r1, 0xF
-	ands r1, r0
-	cmp r1, 0
-	bne _0815404C
-	ldrh r0, [r2, 0x2]
-	adds r1, r4, 0
-	bl LoadPlayerObjectReflectionPalette
-	b _0815406A
-	.pool
-_0815404C:
-	cmp r1, 0xA
-	bne _0815405A
-	ldrh r0, [r2, 0x2]
-	adds r1, r4, 0
-	bl LoadSpecialObjectReflectionPalette
-	b _0815406A
-_0815405A:
-	adds r0, r4, 0
-	bl GetObjectPaletteTag
-	lsls r0, 16
-	lsrs r0, 16
-	adds r1, r4, 0
-	bl PatchObjectPalette
-_0815406A:
-	adds r0, r4, 0
-	bl UpdateSpritePaletteWithWeather
-_08154070:
-	pop {r4}
-	pop {r0}
-	bx r0
-	thumb_func_end npc_pal_op_B
-
-	thumb_func_start npc_pal_op_A
-npc_pal_op_A: @ 8154078
-	push {r4,lr}
-	lsls r1, 24
-	lsrs r4, r1, 24
-	ldrb r0, [r0, 0x5]
-	bl GetEventObjectGraphicsInfo
-	adds r2, r0, 0
-	ldrh r1, [r2, 0x4]
-	ldr r0, =0x000011ff
-	cmp r1, r0
-	beq _0815409C
-	adds r0, r1, 0
-	adds r1, r4, 0
-	bl PatchObjectPalette
-	adds r0, r4, 0
-	bl UpdateSpritePaletteWithWeather
-_0815409C:
-	pop {r4}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end npc_pal_op_A
-
-	thumb_func_start objc_reflection_maybe
-@ void objc_reflection_maybe(struct obj *object)
-objc_reflection_maybe: @ 81540A8
-	push {r4-r7,lr}
-	mov r7, r9
-	mov r6, r8
-	push {r6,r7}
-	adds r4, r0, 0
-	movs r0, 0x2E
-	ldrsh r1, [r4, r0]
-	lsls r0, r1, 3
-	adds r0, r1
-	lsls r0, 2
-	ldr r1, =gEventObjects
-	adds r7, r0, r1
-	ldrb r1, [r7, 0x4]
-	lsls r0, r1, 4
-	adds r0, r1
-	lsls r0, 2
-	ldr r1, =gSprites
-	adds r5, r0, r1
-	ldr r0, [r7]
-	ldr r1, =0x00020001
-	ands r0, r1
-	cmp r0, r1
-	bne _081540E0
-	ldrb r1, [r7, 0x8]
-	movs r2, 0x30
-	ldrsh r0, [r4, r2]
-	cmp r1, r0
-	beq _081540FC
-_081540E0:
-	adds r2, r4, 0
-	adds r2, 0x3E
-	ldrb r1, [r2]
-	movs r0, 0x2
-	negs r0, r0
-	ands r0, r1
-	strb r0, [r2]
-	b _08154214
-	.pool
-_081540FC:
-	ldr r1, =gReflectionEffectPaletteMap
-	ldrb r0, [r5, 0x5]
-	lsrs r0, 4
-	adds r0, r1
-	ldrb r1, [r0]
-	lsls r1, 4
-	ldrb r2, [r4, 0x5]
-	movs r0, 0xF
-	ands r0, r2
-	orrs r0, r1
-	strb r0, [r4, 0x5]
-	ldrb r1, [r5, 0x1]
-	lsrs r1, 6
-	lsls r1, 6
-	ldrb r2, [r4, 0x1]
-	movs r3, 0x3F
-	adds r0, r3, 0
-	ands r0, r2
-	orrs r0, r1
-	strb r0, [r4, 0x1]
-	ldrb r0, [r5, 0x3]
-	lsrs r0, 6
-	lsls r0, 6
-	ldrb r2, [r4, 0x3]
-	adds r1, r3, 0
-	ands r1, r2
-	orrs r1, r0
-	strb r1, [r4, 0x3]
-	ldrb r0, [r5, 0x3]
-	lsls r0, 26
-	lsrs r0, 27
-	movs r2, 0x10
-	orrs r0, r2
-	lsls r0, 1
-	subs r2, 0x4F
-	mov r9, r2
-	ands r1, r2
-	orrs r1, r0
-	strb r1, [r4, 0x3]
-	ldrh r1, [r5, 0x4]
-	lsls r1, 22
-	lsrs r1, 22
-	ldrh r2, [r4, 0x4]
-	ldr r0, =0xfffffc00
-	ands r0, r2
-	orrs r0, r1
-	strh r0, [r4, 0x4]
-	ldr r0, [r5, 0x18]
-	str r0, [r4, 0x18]
-	adds r0, r5, 0
-	adds r0, 0x42
-	ldrb r0, [r0]
-	lsls r0, 26
-	lsrs r0, 26
-	adds r2, r4, 0
-	adds r2, 0x42
-	ands r3, r0
-	ldrb r1, [r2]
-	movs r0, 0x40
-	negs r0, r0
-	ands r0, r1
-	orrs r0, r3
-	strb r0, [r2]
-	movs r0, 0x3E
-	adds r0, r5
-	mov r8, r0
-	ldrb r0, [r0]
-	adds r6, r4, 0
-	adds r6, 0x3E
-	movs r1, 0x4
-	ands r1, r0
-	ldrb r2, [r6]
-	movs r0, 0x5
-	negs r0, r0
-	ands r0, r2
-	orrs r0, r1
-	strb r0, [r6]
-	ldrh r0, [r5, 0x20]
-	strh r0, [r4, 0x20]
-	adds r0, r7, 0
-	bl sub_8153F98
-	ldrh r1, [r5, 0x22]
-	adds r0, r1
-	ldrh r1, [r4, 0x32]
-	adds r1, r0
-	strh r1, [r4, 0x22]
-	adds r0, r5, 0
-	adds r0, 0x28
-	ldrb r1, [r0]
-	adds r0, r4, 0
-	adds r0, 0x28
-	strb r1, [r0]
-	adds r0, r5, 0
-	adds r0, 0x29
-	ldrb r0, [r0]
-	adds r1, r4, 0
-	adds r1, 0x29
-	strb r0, [r1]
-	ldrh r0, [r5, 0x24]
-	strh r0, [r4, 0x24]
-	ldrh r0, [r5, 0x26]
-	negs r0, r0
-	strh r0, [r4, 0x26]
-	mov r2, r8
-	ldrb r1, [r2]
-	movs r0, 0x2
-	ands r0, r1
-	ldrb r1, [r6]
-	movs r2, 0x3
-	negs r2, r2
-	ands r2, r1
-	orrs r2, r0
-	strb r2, [r6]
-	ldrb r0, [r7, 0x3]
-	lsls r0, 28
-	cmp r0, 0
-	bge _081541EE
-	movs r0, 0x4
-	orrs r2, r0
-	strb r2, [r6]
-_081541EE:
-	movs r1, 0x3C
-	ldrsh r0, [r4, r1]
-	cmp r0, 0
-	bne _08154214
-	ldrb r0, [r4, 0x3]
-	mov r2, r9
-	ands r2, r0
-	strb r2, [r4, 0x3]
-	ldrb r0, [r5, 0x3]
-	lsls r0, 26
-	lsrs r0, 27
-	movs r1, 0x8
-	ands r0, r1
-	cmp r0, 0
-	beq _08154214
-	movs r1, 0x2
-	adds r0, r2, 0
-	orrs r0, r1
-	strb r0, [r4, 0x3]
-_08154214:
-	pop {r3,r4}
-	mov r8, r3
-	mov r9, r4
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end objc_reflection_maybe
-
-	thumb_func_start sub_8154228
-sub_8154228: @ 8154228
-	push {r4,lr}
-	ldr r0, =gFieldEffectObjectTemplatePointers
-	ldr r0, [r0, 0x20]
-	movs r1, 0
-	movs r2, 0
-	movs r3, 0x52
-	bl CreateSpriteAtEnd
-	lsls r0, 24
-	lsrs r0, 24
-	adds r4, r0, 0
-	cmp r0, 0x40
-	beq _08154266
-	lsls r1, r0, 4
-	adds r1, r0
-	lsls r1, 2
-	ldr r0, =gSprites
-	adds r1, r0
-	ldrb r2, [r1, 0x5]
-	movs r0, 0xD
-	negs r0, r0
-	ands r0, r2
-	movs r3, 0x4
-	orrs r0, r3
-	strb r0, [r1, 0x5]
-	adds r1, 0x3E
-	ldrb r0, [r1]
-	movs r2, 0x2
-	orrs r0, r2
-	orrs r0, r3
-	strb r0, [r1]
-_08154266:
-	adds r0, r4, 0
-	pop {r4}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end sub_8154228
-
-	thumb_func_start objid_set_invisible
-objid_set_invisible: @ 8154278
-	lsls r0, 24
-	lsrs r0, 24
-	ldr r2, =gSprites
-	lsls r1, r0, 4
-	adds r1, r0
-	lsls r1, 2
-	adds r1, r2
-	adds r1, 0x3E
-	ldrb r0, [r1]
-	movs r2, 0x4
-	orrs r0, r2
-	strb r0, [r1]
-	bx lr
-	.pool
-	thumb_func_end objid_set_invisible
-
-	thumb_func_start sub_8154298
-sub_8154298: @ 8154298
-	push {r4-r7,lr}
-	mov r7, r8
-	push {r7}
-	sub sp, 0x4
-	lsls r0, 24
-	lsrs r5, r0, 24
-	lsls r1, 24
-	lsrs r1, 24
-	mov r8, r1
-	lsls r2, 16
-	lsrs r7, r2, 16
-	lsls r3, 16
-	lsrs r6, r3, 16
-	lsls r0, r5, 4
-	adds r0, r5
-	lsls r0, 2
-	ldr r1, =gSprites
-	adds r2, r0, r1
-	adds r0, r2, 0
-	adds r0, 0x3E
-	ldrb r1, [r0]
-	movs r0, 0x4
-	ands r0, r1
-	cmp r0, 0
-	bne _081542E2
-	movs r0, 0x2E
-	ldrsh r1, [r2, r0]
-	lsls r0, r7, 16
-	asrs r0, 16
-	cmp r1, r0
-	bne _081542E2
-	movs r0, 0x30
-	ldrsh r1, [r2, r0]
-	lsls r0, r6, 16
-	asrs r0, 16
-	cmp r1, r0
-	beq _0815432E
-_081542E2:
-	lsls r0, r7, 16
-	asrs r0, 16
-	lsls r1, r6, 16
-	asrs r1, 16
-	mov r4, sp
-	adds r4, 0x2
-	mov r2, sp
-	adds r3, r4, 0
-	bl sub_8093038
-	lsls r0, r5, 4
-	adds r0, r5
-	lsls r0, 2
-	ldr r1, =gSprites
-	adds r2, r0, r1
-	mov r0, sp
-	ldrh r0, [r0]
-	adds r0, 0x8
-	strh r0, [r2, 0x20]
-	ldrh r0, [r4]
-	adds r0, 0x8
-	strh r0, [r2, 0x22]
-	adds r3, r2, 0
-	adds r3, 0x3E
-	ldrb r1, [r3]
-	movs r0, 0x5
-	negs r0, r0
-	ands r0, r1
-	strb r0, [r3]
-	strh r7, [r2, 0x2E]
-	strh r6, [r2, 0x30]
-	mov r1, r8
-	subs r1, 0x1
-	lsls r1, 24
-	lsrs r1, 24
-	adds r0, r2, 0
-	bl StartSpriteAnim
-_0815432E:
-	add sp, 0x4
-	pop {r3}
-	mov r8, r3
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_8154298
-
-	thumb_func_start oei_shadow
-oei_shadow: @ 8154340
-	push {r4,r5,lr}
-	ldr r5, =gFieldEffectArguments
-	ldrb r0, [r5]
-	ldrb r1, [r5, 0x4]
-	ldrb r2, [r5, 0x8]
-	bl GetEventObjectIdByLocalIdAndMap
-	lsls r0, 24
-	lsrs r0, 24
-	ldr r2, =gEventObjects
-	lsls r1, r0, 3
-	adds r1, r0
-	lsls r1, 2
-	adds r1, r2
-	ldrb r0, [r1, 0x5]
-	bl GetEventObjectGraphicsInfo
-	adds r4, r0, 0
-	ldr r2, =gFieldEffectObjectTemplatePointers
-	ldr r1, =gUnknown_085CDC3E
-	ldrb r0, [r4, 0xC]
-	lsls r0, 26
-	lsrs r0, 30
-	adds r0, r1
-	ldrb r0, [r0]
-	lsls r0, 2
-	adds r0, r2
-	ldr r0, [r0]
-	movs r1, 0
-	movs r2, 0
-	movs r3, 0x94
-	bl CreateSpriteAtEnd
-	lsls r0, 24
-	lsrs r1, r0, 24
-	cmp r1, 0x40
-	beq _081543C4
-	ldr r0, =gSprites
-	lsls r2, r1, 4
-	adds r2, r1
-	lsls r2, 2
-	adds r2, r0
-	adds r3, r2, 0
-	adds r3, 0x3E
-	ldrb r0, [r3]
-	movs r1, 0x2
-	orrs r0, r1
-	strb r0, [r3]
-	ldr r0, [r5]
-	strh r0, [r2, 0x2E]
-	ldr r0, [r5, 0x4]
-	strh r0, [r2, 0x30]
-	ldr r0, [r5, 0x8]
-	strh r0, [r2, 0x32]
-	ldrh r1, [r4, 0xA]
-	lsls r1, 16
-	asrs r1, 17
-	ldr r3, =gUnknown_085CDC42
-	ldrb r0, [r4, 0xC]
-	lsls r0, 26
-	lsrs r0, 30
-	lsls r0, 1
-	adds r0, r3
-	ldrh r0, [r0]
-	subs r1, r0
-	strh r1, [r2, 0x34]
-_081543C4:
-	movs r0, 0
-	pop {r4,r5}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end oei_shadow
-
-	thumb_func_start oamc_shadow
-oamc_shadow: @ 81543E4
-	push {r4,r5,lr}
-	sub sp, 0x4
-	adds r5, r0, 0
-	ldrh r0, [r5, 0x2E]
-	lsls r0, 24
-	lsrs r0, 24
-	ldrh r1, [r5, 0x30]
-	lsls r1, 24
-	lsrs r1, 24
-	ldrh r2, [r5, 0x32]
-	lsls r2, 24
-	lsrs r2, 24
-	mov r3, sp
-	bl TryGetEventObjectIdByLocalIdAndMap
-	lsls r0, 24
-	cmp r0, 0
-	beq _08154412
-	adds r0, r5, 0
-	movs r1, 0x3
-	bl FieldEffectStop
-	b _08154498
-_08154412:
-	mov r0, sp
-	ldrb r1, [r0]
-	lsls r0, r1, 3
-	adds r0, r1
-	lsls r0, 2
-	ldr r1, =gEventObjects
-	adds r4, r0, r1
-	ldrb r0, [r4, 0x4]
-	lsls r1, r0, 4
-	adds r1, r0
-	lsls r1, 2
-	ldr r0, =gSprites
-	adds r1, r0
-	ldrb r0, [r1, 0x5]
-	movs r2, 0xC
-	ands r2, r0
-	ldrb r3, [r5, 0x5]
-	movs r0, 0xD
-	negs r0, r0
-	ands r0, r3
-	orrs r0, r2
-	strb r0, [r5, 0x5]
-	ldrh r0, [r1, 0x20]
-	strh r0, [r5, 0x20]
-	ldrh r0, [r5, 0x34]
-	ldrh r1, [r1, 0x22]
-	adds r0, r1
-	strh r0, [r5, 0x22]
-	ldr r0, [r4]
-	ldr r1, =0x00400001
-	ands r0, r1
-	cmp r0, r1
-	bne _08154490
-	ldrb r0, [r4, 0x1E]
-	bl MetatileBehavior_IsPokeGrass
-	lsls r0, 24
-	cmp r0, 0
-	bne _08154490
-	ldrb r0, [r4, 0x1E]
-	bl MetatileBehavior_IsSurfableWaterOrUnderwater
-	lsls r0, 24
-	cmp r0, 0
-	bne _08154490
-	ldrb r0, [r4, 0x1F]
-	bl MetatileBehavior_IsSurfableWaterOrUnderwater
-	lsls r0, 24
-	cmp r0, 0
-	bne _08154490
-	ldrb r0, [r4, 0x1E]
-	bl MetatileBehavior_IsReflective
-	lsls r0, 24
-	cmp r0, 0
-	bne _08154490
-	ldrb r0, [r4, 0x1F]
-	bl MetatileBehavior_IsReflective
-	lsls r0, 24
-	cmp r0, 0
-	beq _08154498
-_08154490:
-	adds r0, r5, 0
-	movs r1, 0x3
-	bl FieldEffectStop
-_08154498:
-	add sp, 0x4
-	pop {r4,r5}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end oamc_shadow
-
-	thumb_func_start oei_grass_normal
-oei_grass_normal: @ 81544AC
-	push {r4,r5,lr}
-	sub sp, 0x4
-	ldr r5, =gFieldEffectArguments
-	ldrh r1, [r5]
-	mov r0, sp
-	strh r1, [r0]
-	ldrh r0, [r5, 0x4]
-	mov r4, sp
-	adds r4, 0x2
-	strh r0, [r4]
-	mov r0, sp
-	adds r1, r4, 0
-	movs r2, 0x8
-	movs r3, 0x8
-	bl sub_80930E0
-	ldr r0, =gFieldEffectObjectTemplatePointers
-	ldr r0, [r0, 0x10]
-	mov r1, sp
-	movs r2, 0
-	ldrsh r1, [r1, r2]
-	movs r3, 0
-	ldrsh r2, [r4, r3]
-	movs r3, 0
-	bl CreateSpriteAtEnd
-	lsls r0, 24
-	lsrs r1, r0, 24
-	cmp r1, 0x40
-	beq _08154538
-	lsls r0, r1, 4
-	adds r0, r1
-	lsls r0, 2
-	ldr r1, =gSprites
-	adds r3, r0, r1
-	adds r2, r3, 0
-	adds r2, 0x3E
-	ldrb r0, [r2]
-	movs r1, 0x2
-	orrs r0, r1
-	strb r0, [r2]
-	movs r0, 0x3
-	ldrb r1, [r5, 0xC]
-	ands r1, r0
-	lsls r1, 2
-	ldrb r2, [r3, 0x5]
-	movs r0, 0xD
-	negs r0, r0
-	ands r0, r2
-	orrs r0, r1
-	strb r0, [r3, 0x5]
-	ldr r0, [r5, 0x8]
-	strh r0, [r3, 0x2E]
-	ldr r0, [r5]
-	strh r0, [r3, 0x30]
-	ldr r0, [r5, 0x4]
-	strh r0, [r3, 0x32]
-	ldr r0, [r5, 0x10]
-	strh r0, [r3, 0x34]
-	ldr r0, [r5, 0x14]
-	strh r0, [r3, 0x36]
-	ldr r0, [r5, 0x18]
-	strh r0, [r3, 0x38]
-	ldr r0, [r5, 0x1C]
-	cmp r0, 0
-	beq _08154538
-	adds r0, r3, 0
-	movs r1, 0x4
-	bl SeekSpriteAnim
-_08154538:
-	movs r0, 0
-	add sp, 0x4
-	pop {r4,r5}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end oei_grass_normal
-
-	thumb_func_start unc_grass_normal
-unc_grass_normal: @ 8154550
-	push {r4-r7,lr}
-	mov r7, r8
-	push {r7}
-	sub sp, 0x4
-	adds r5, r0, 0
-	ldrh r0, [r5, 0x38]
-	lsrs r4, r0, 8
-	lsls r0, 24
-	lsrs r7, r0, 24
-	ldr r3, =gCamera
-	ldrb r1, [r3]
-	movs r0, 0x1
-	ands r0, r1
-	cmp r0, 0
-	beq _0815459C
-	ldr r0, =gSaveBlock1Ptr
-	ldr r2, [r0]
-	movs r0, 0x5
-	ldrsb r0, [r2, r0]
-	cmp r0, r4
-	bne _08154582
-	movs r0, 0x4
-	ldrsb r0, [r2, r0]
-	cmp r0, r7
-	beq _0815459C
-_08154582:
-	ldr r1, [r3, 0x4]
-	ldrh r0, [r5, 0x30]
-	subs r0, r1
-	strh r0, [r5, 0x30]
-	ldr r1, [r3, 0x8]
-	ldrh r0, [r5, 0x32]
-	subs r0, r1
-	strh r0, [r5, 0x32]
-	ldrb r1, [r2, 0x5]
-	lsls r1, 8
-	ldrb r0, [r2, 0x4]
-	orrs r0, r1
-	strh r0, [r5, 0x38]
-_0815459C:
-	ldrh r0, [r5, 0x34]
-	lsrs r1, r0, 8
-	mov r8, r1
-	lsls r0, 24
-	lsrs r4, r0, 24
-	ldrh r0, [r5, 0x36]
-	lsls r0, 24
-	lsrs r7, r0, 24
-	movs r2, 0x30
-	ldrsh r0, [r5, r2]
-	movs r2, 0x32
-	ldrsh r1, [r5, r2]
-	bl MapGridGetMetatileBehaviorAt
-	lsls r0, 24
-	lsrs r6, r0, 24
-	mov r0, r8
-	adds r1, r4, 0
-	adds r2, r7, 0
-	mov r3, sp
-	bl TryGetEventObjectIdByLocalIdAndMap
-	lsls r0, 24
-	cmp r0, 0
-	bne _081545F0
-	adds r0, r6, 0
-	bl MetatileBehavior_IsTallGrass
-	lsls r0, 24
-	cmp r0, 0
-	beq _081545F0
-	movs r1, 0x3C
-	ldrsh r0, [r5, r1]
-	cmp r0, 0
-	beq _08154604
-	adds r0, r5, 0
-	adds r0, 0x3F
-	ldrb r1, [r0]
-	movs r0, 0x10
-	ands r0, r1
-	cmp r0, 0
-	beq _08154604
-_081545F0:
-	adds r0, r5, 0
-	movs r1, 0x4
-	bl FieldEffectStop
-	b _08154648
-	.pool
-_08154604:
-	mov r0, sp
-	ldrb r1, [r0]
-	lsls r0, r1, 3
-	adds r0, r1
-	lsls r0, 2
-	ldr r1, =gEventObjects
-	adds r2, r0, r1
-	ldr r0, [r2, 0x10]
-	ldr r1, [r5, 0x30]
-	cmp r0, r1
-	beq _08154624
-	ldr r0, [r2, 0x14]
-	cmp r0, r1
-	beq _08154624
-	movs r0, 0x1
-	strh r0, [r5, 0x3C]
-_08154624:
-	movs r6, 0
-	adds r0, r5, 0
-	adds r0, 0x2B
-	ldrb r0, [r0]
-	cmp r0, 0
-	bne _08154632
-	movs r6, 0x4
-_08154632:
-	adds r0, r5, 0
-	movs r1, 0
-	bl UpdateEventObjectSpriteVisibility
-	ldrh r1, [r5, 0x2E]
-	lsls r1, 24
-	lsrs r1, 24
-	adds r0, r5, 0
-	adds r2, r6, 0
-	bl sub_81561FC
-_08154648:
-	add sp, 0x4
-	pop {r3}
-	mov r8, r3
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end unc_grass_normal
-
-	thumb_func_start sub_8154658
-sub_8154658: @ 8154658
-	push {r4,lr}
-	ldr r4, =gFieldEffectArguments
-	adds r1, r4, 0x4
-	adds r0, r4, 0
-	movs r2, 0x8
-	movs r3, 0xC
-	bl sub_80930E0
-	ldr r0, =gFieldEffectObjectTemplatePointers
-	ldr r0, [r0, 0x28]
-	movs r2, 0
-	ldrsh r1, [r4, r2]
-	movs r3, 0x4
-	ldrsh r2, [r4, r3]
-	movs r3, 0
-	bl CreateSpriteAtEnd
-	lsls r0, 24
-	lsrs r0, 24
-	cmp r0, 0x40
-	beq _081546B4
-	lsls r2, r0, 4
-	adds r2, r0
-	lsls r2, 2
-	ldr r0, =gSprites
-	adds r2, r0
-	adds r3, r2, 0
-	adds r3, 0x3E
-	ldrb r0, [r3]
-	movs r1, 0x2
-	orrs r0, r1
-	strb r0, [r3]
-	movs r0, 0x3
-	ldrb r1, [r4, 0xC]
-	ands r1, r0
-	lsls r1, 2
-	ldrb r3, [r2, 0x5]
-	movs r0, 0xD
-	negs r0, r0
-	ands r0, r3
-	orrs r0, r1
-	strb r0, [r2, 0x5]
-	ldr r0, [r4, 0x8]
-	strh r0, [r2, 0x2E]
-	movs r0, 0xC
-	strh r0, [r2, 0x30]
-_081546B4:
-	movs r0, 0
-	pop {r4}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end sub_8154658
-
-	thumb_func_start sub_81546C8
-sub_81546C8: @ 81546C8
-	push {r4-r7,lr}
-	mov r7, r8
-	push {r7}
-	ldr r4, [sp, 0x18]
-	lsls r0, 24
-	lsrs r0, 24
-	mov r12, r0
-	lsls r1, 24
-	lsrs r7, r1, 24
-	lsls r2, 24
-	lsrs r6, r2, 24
-	movs r5, 0
-	ldr r0, =gSprites
-	mov r8, r0
-	lsls r3, 16
-	asrs r3, 16
-	lsls r4, 16
-	asrs r4, 16
-_081546EC:
-	lsls r0, r5, 4
-	adds r0, r5
-	lsls r0, 2
-	mov r1, r8
-	adds r2, r0, r1
-	adds r0, r2, 0
-	adds r0, 0x3E
-	ldrb r0, [r0]
-	lsls r0, 31
-	cmp r0, 0
-	beq _08154740
-	ldr r1, [r2, 0x1C]
-	ldr r0, =unc_grass_normal
-	cmp r1, r0
-	bne _08154740
-	movs r1, 0x30
-	ldrsh r0, [r2, r1]
-	cmp r3, r0
-	bne _08154740
-	movs r1, 0x32
-	ldrsh r0, [r2, r1]
-	cmp r4, r0
-	bne _08154740
-	ldrh r1, [r2, 0x34]
-	lsrs r0, r1, 8
-	cmp r12, r0
-	bne _08154740
-	movs r0, 0xFF
-	ands r0, r1
-	cmp r7, r0
-	bne _08154740
-	movs r1, 0x36
-	ldrsh r0, [r2, r1]
-	cmp r6, r0
-	bne _08154740
-	adds r0, r5, 0
-	b _0815474C
-	.pool
-_08154740:
-	adds r0, r5, 0x1
-	lsls r0, 24
-	lsrs r5, r0, 24
-	cmp r5, 0x3F
-	bls _081546EC
-	movs r0, 0x40
-_0815474C:
-	pop {r3}
-	mov r8, r3
-	pop {r4-r7}
-	pop {r1}
-	bx r1
-	thumb_func_end sub_81546C8
-
-	thumb_func_start sub_8154758
-sub_8154758: @ 8154758
-	push {r4,r5,lr}
-	sub sp, 0x4
-	ldr r5, =gFieldEffectArguments
-	ldrh r1, [r5]
-	mov r0, sp
-	strh r1, [r0]
-	ldrh r0, [r5, 0x4]
-	mov r4, sp
-	adds r4, 0x2
-	strh r0, [r4]
-	mov r0, sp
-	adds r1, r4, 0
-	movs r2, 0x8
-	movs r3, 0x8
-	bl sub_80930E0
-	ldr r0, =gFieldEffectObjectTemplatePointers
-	ldr r0, [r0, 0x3C]
-	mov r1, sp
-	movs r2, 0
-	ldrsh r1, [r1, r2]
-	movs r3, 0
-	ldrsh r2, [r4, r3]
-	movs r3, 0
-	bl CreateSpriteAtEnd
-	lsls r0, 24
-	lsrs r1, r0, 24
-	cmp r1, 0x40
-	beq _081547E8
-	lsls r0, r1, 4
-	adds r0, r1
-	lsls r0, 2
-	ldr r1, =gSprites
-	adds r4, r0, r1
-	adds r2, r4, 0
-	adds r2, 0x3E
-	ldrb r0, [r2]
-	movs r1, 0x2
-	orrs r0, r1
-	strb r0, [r2]
-	ldrb r0, [r5, 0x8]
-	bl ZCoordToPriority
-	movs r1, 0x3
-	ands r1, r0
-	lsls r1, 2
-	ldrb r2, [r4, 0x5]
-	movs r0, 0xD
-	negs r0, r0
-	ands r0, r2
-	orrs r0, r1
-	strb r0, [r4, 0x5]
-	ldr r0, [r5, 0x8]
-	strh r0, [r4, 0x2E]
-	ldr r0, [r5]
-	strh r0, [r4, 0x30]
-	ldr r0, [r5, 0x4]
-	strh r0, [r4, 0x32]
-	ldr r0, [r5, 0x10]
-	strh r0, [r4, 0x34]
-	ldr r0, [r5, 0x14]
-	strh r0, [r4, 0x36]
-	ldr r0, [r5, 0x18]
-	strh r0, [r4, 0x38]
-	ldr r0, [r5, 0x1C]
-	cmp r0, 0
-	beq _081547E8
-	adds r0, r4, 0
-	movs r1, 0x6
-	bl SeekSpriteAnim
-_081547E8:
-	movs r0, 0
-	add sp, 0x4
-	pop {r4,r5}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end sub_8154758
-
-	thumb_func_start unc_grass_tall
-unc_grass_tall: @ 8154800
-	push {r4-r7,lr}
-	mov r7, r8
-	push {r7}
-	sub sp, 0x4
-	adds r5, r0, 0
-	ldrh r0, [r5, 0x38]
-	lsrs r7, r0, 8
-	lsls r0, 24
-	lsrs r6, r0, 24
-	ldr r3, =gCamera
-	ldrb r1, [r3]
-	movs r0, 0x1
-	ands r0, r1
-	cmp r0, 0
-	beq _0815484C
-	ldr r0, =gSaveBlock1Ptr
-	ldr r2, [r0]
-	movs r0, 0x5
-	ldrsb r0, [r2, r0]
-	cmp r0, r7
-	bne _08154832
-	movs r0, 0x4
-	ldrsb r0, [r2, r0]
-	cmp r0, r6
-	beq _0815484C
-_08154832:
-	ldr r1, [r3, 0x4]
-	ldrh r0, [r5, 0x30]
-	subs r0, r1
-	strh r0, [r5, 0x30]
-	ldr r1, [r3, 0x8]
-	ldrh r0, [r5, 0x32]
-	subs r0, r1
-	strh r0, [r5, 0x32]
-	ldrb r1, [r2, 0x5]
-	lsls r1, 8
-	ldrb r0, [r2, 0x4]
-	orrs r0, r1
-	strh r0, [r5, 0x38]
-_0815484C:
-	ldrh r0, [r5, 0x34]
-	lsrs r1, r0, 8
-	mov r8, r1
-	lsls r0, 24
-	lsrs r7, r0, 24
-	ldrh r0, [r5, 0x36]
-	lsls r0, 24
-	lsrs r6, r0, 24
-	movs r2, 0x30
-	ldrsh r0, [r5, r2]
-	movs r2, 0x32
-	ldrsh r1, [r5, r2]
-	bl MapGridGetMetatileBehaviorAt
-	lsls r0, 24
-	lsrs r4, r0, 24
-	mov r0, r8
-	adds r1, r7, 0
-	adds r2, r6, 0
-	mov r3, sp
-	bl TryGetEventObjectIdByLocalIdAndMap
-	lsls r0, 24
-	cmp r0, 0
-	bne _081548A0
-	adds r0, r4, 0
-	bl MetatileBehavior_IsLongGrass
-	lsls r0, 24
-	cmp r0, 0
-	beq _081548A0
-	movs r1, 0x3C
-	ldrsh r0, [r5, r1]
-	cmp r0, 0
-	beq _081548B4
-	adds r0, r5, 0
-	adds r0, 0x3F
-	ldrb r1, [r0]
-	movs r0, 0x10
-	ands r0, r1
-	cmp r0, 0
-	beq _081548B4
-_081548A0:
-	adds r0, r5, 0
-	movs r1, 0x11
-	bl FieldEffectStop
-	b _081548EA
-	.pool
-_081548B4:
-	mov r0, sp
-	ldrb r1, [r0]
-	lsls r0, r1, 3
-	adds r0, r1
-	lsls r0, 2
-	ldr r1, =gEventObjects
-	adds r2, r0, r1
-	ldr r0, [r2, 0x10]
-	ldr r1, [r5, 0x30]
-	cmp r0, r1
-	beq _081548D4
-	ldr r0, [r2, 0x14]
-	cmp r0, r1
-	beq _081548D4
-	movs r0, 0x1
-	strh r0, [r5, 0x3C]
-_081548D4:
-	adds r0, r5, 0
-	movs r1, 0
-	bl UpdateEventObjectSpriteVisibility
-	ldrh r1, [r5, 0x2E]
-	lsls r1, 24
-	lsrs r1, 24
-	adds r0, r5, 0
-	movs r2, 0
-	bl sub_81561FC
-_081548EA:
-	add sp, 0x4
-	pop {r3}
-	mov r8, r3
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end unc_grass_tall
-
-	thumb_func_start sub_81548FC
-sub_81548FC: @ 81548FC
-	push {r4,lr}
-	ldr r4, =gFieldEffectArguments
-	adds r1, r4, 0x4
-	adds r0, r4, 0
-	movs r2, 0x8
-	movs r3, 0x8
-	bl sub_80930E0
-	ldr r0, =gFieldEffectObjectTemplatePointers
-	ldr r0, [r0, 0x40]
-	movs r2, 0
-	ldrsh r1, [r4, r2]
-	movs r3, 0x4
-	ldrsh r2, [r4, r3]
-	movs r3, 0
-	bl CreateSpriteAtEnd
-	lsls r0, 24
-	lsrs r0, 24
-	cmp r0, 0x40
-	beq _08154958
-	lsls r2, r0, 4
-	adds r2, r0
-	lsls r2, 2
-	ldr r0, =gSprites
-	adds r2, r0
-	adds r3, r2, 0
-	adds r3, 0x3E
-	ldrb r0, [r3]
-	movs r1, 0x2
-	orrs r0, r1
-	strb r0, [r3]
-	movs r0, 0x3
-	ldrb r1, [r4, 0xC]
-	ands r1, r0
-	lsls r1, 2
-	ldrb r3, [r2, 0x5]
-	movs r0, 0xD
-	negs r0, r0
-	ands r0, r3
-	orrs r0, r1
-	strb r0, [r2, 0x5]
-	ldr r0, [r4, 0x8]
-	strh r0, [r2, 0x2E]
-	movs r0, 0x12
-	strh r0, [r2, 0x30]
-_08154958:
-	movs r0, 0
-	pop {r4}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end sub_81548FC
-
-	thumb_func_start sub_815496C
-sub_815496C: @ 815496C
-	push {r4-r6,lr}
-	ldr r6, =gFieldEffectArguments
-	ldrb r0, [r6]
-	ldrb r1, [r6, 0x4]
-	ldrb r2, [r6, 0x8]
-	bl GetEventObjectIdByLocalIdAndMap
-	lsls r0, 24
-	lsrs r0, 24
-	lsls r1, r0, 3
-	adds r1, r0
-	lsls r1, 2
-	ldr r0, =gEventObjects
-	adds r5, r1, r0
-	ldr r0, =gFieldEffectObjectTemplatePointers
-	ldr r0, [r0, 0x78]
-	movs r1, 0
-	movs r2, 0
-	movs r3, 0
-	bl CreateSpriteAtEnd
-	lsls r0, 24
-	lsrs r0, 24
-	cmp r0, 0x40
-	beq _081549F8
-	lsls r2, r0, 4
-	adds r2, r0
-	lsls r2, 2
-	ldr r4, =gSprites
-	adds r2, r4
-	adds r3, r2, 0
-	adds r3, 0x3E
-	ldrb r0, [r3]
-	movs r1, 0x2
-	orrs r0, r1
-	strb r0, [r3]
-	ldrb r1, [r5, 0x4]
-	lsls r0, r1, 4
-	adds r0, r1
-	lsls r0, 2
-	adds r0, r4
-	ldrb r0, [r0, 0x5]
-	movs r1, 0xC
-	ands r1, r0
-	ldrb r3, [r2, 0x5]
-	movs r0, 0xD
-	negs r0, r0
-	ands r0, r3
-	orrs r0, r1
-	strb r0, [r2, 0x5]
-	ldr r0, [r6]
-	strh r0, [r2, 0x2E]
-	ldr r0, [r6, 0x4]
-	strh r0, [r2, 0x30]
-	ldr r0, [r6, 0x8]
-	strh r0, [r2, 0x32]
-	ldrb r1, [r5, 0x4]
-	lsls r0, r1, 4
-	adds r0, r1
-	lsls r0, 2
-	adds r0, r4
-	ldrh r0, [r0, 0x20]
-	strh r0, [r2, 0x34]
-	ldrb r1, [r5, 0x4]
-	lsls r0, r1, 4
-	adds r0, r1
-	lsls r0, 2
-	adds r0, r4
-	ldrh r0, [r0, 0x22]
-	strh r0, [r2, 0x36]
-_081549F8:
-	movs r0, 0
-	pop {r4-r6}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end sub_815496C
-
-	thumb_func_start sub_8154A10
-sub_8154A10: @ 8154A10
-	push {r4-r7,lr}
-	mov r7, r8
-	push {r7}
-	sub sp, 0x4
-	adds r4, r0, 0
-	ldrh r0, [r4, 0x2E]
-	lsls r0, 24
-	lsrs r0, 24
-	ldrh r1, [r4, 0x30]
-	lsls r1, 24
-	lsrs r1, 24
-	ldrh r2, [r4, 0x32]
-	lsls r2, 24
-	lsrs r2, 24
-	mov r3, sp
-	bl TryGetEventObjectIdByLocalIdAndMap
-	lsls r0, 24
-	cmp r0, 0
-	bne _08154A4E
-	ldr r5, =gEventObjects
-	mov r0, sp
-	ldrb r1, [r0]
-	lsls r0, r1, 3
-	adds r0, r1
-	lsls r0, 2
-	adds r1, r0, r5
-	ldrb r0, [r1, 0x2]
-	lsls r0, 29
-	cmp r0, 0
-	blt _08154A5C
-_08154A4E:
-	adds r0, r4, 0
-	movs r1, 0x29
-	bl FieldEffectStop
-	b _08154AF2
-	.pool
-_08154A5C:
-	ldrb r0, [r1, 0x5]
-	bl GetEventObjectGraphicsInfo
-	mov r8, r0
-	mov r0, sp
-	ldrb r1, [r0]
-	lsls r0, r1, 3
-	adds r0, r1
-	lsls r0, 2
-	adds r0, r5
-	ldrb r1, [r0, 0x4]
-	lsls r0, r1, 4
-	adds r0, r1
-	lsls r0, 2
-	ldr r1, =gSprites
-	adds r6, r0, r1
-	ldrh r5, [r6, 0x22]
-	ldrh r7, [r6, 0x20]
-	movs r0, 0x20
-	ldrsh r1, [r6, r0]
-	movs r2, 0x34
-	ldrsh r0, [r4, r2]
-	cmp r1, r0
-	bne _08154A98
-	lsls r0, r5, 16
-	asrs r0, 16
-	movs r2, 0x36
-	ldrsh r1, [r4, r2]
-	cmp r0, r1
-	beq _08154AB2
-_08154A98:
-	strh r7, [r4, 0x34]
-	strh r5, [r4, 0x36]
-	adds r0, r4, 0
-	adds r0, 0x3F
-	ldrb r1, [r0]
-	movs r0, 0x10
-	ands r0, r1
-	cmp r0, 0
-	beq _08154AB2
-	adds r0, r4, 0
-	movs r1, 0
-	bl StartSpriteAnim
-_08154AB2:
-	strh r7, [r4, 0x20]
-	strh r5, [r4, 0x22]
-	mov r1, r8
-	ldrh r0, [r1, 0xA]
-	lsls r0, 16
-	asrs r0, 17
-	subs r0, 0x8
-	strh r0, [r4, 0x26]
-	adds r0, r6, 0
-	adds r0, 0x43
-	ldrb r0, [r0]
-	subs r0, 0x1
-	adds r1, r4, 0
-	adds r1, 0x43
-	strb r0, [r1]
-	ldrb r0, [r6, 0x5]
-	movs r1, 0xC
-	ands r1, r0
-	ldrb r2, [r4, 0x5]
-	movs r0, 0xD
-	negs r0, r0
-	ands r0, r2
-	orrs r0, r1
-	strb r0, [r4, 0x5]
-	adds r0, r6, 0
-	adds r0, 0x3E
-	ldrb r1, [r0]
-	lsls r1, 29
-	lsrs r1, 31
-	adds r0, r4, 0
-	bl UpdateEventObjectSpriteVisibility
-_08154AF2:
-	add sp, 0x4
-	pop {r3}
-	mov r8, r3
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_8154A10
-
-	thumb_func_start sub_8154B04
-sub_8154B04: @ 8154B04
-	push {r4,lr}
-	ldr r4, =gFieldEffectArguments
-	adds r1, r4, 0x4
-	adds r0, r4, 0
-	movs r2, 0x8
-	movs r3, 0x8
-	bl sub_80930E0
-	ldr r0, =gFieldEffectObjectTemplatePointers
-	ldr r0, [r0, 0x2C]
-	movs r2, 0
-	ldrsh r1, [r4, r2]
-	movs r3, 0x4
-	ldrsh r2, [r4, r3]
-	ldrb r3, [r4, 0x8]
-	bl CreateSpriteAtEnd
-	lsls r0, 24
-	lsrs r1, r0, 24
-	cmp r1, 0x40
-	beq _08154B62
-	lsls r0, r1, 4
-	adds r0, r1
-	lsls r0, 2
-	ldr r1, =gSprites
-	adds r0, r1
-	adds r3, r0, 0
-	adds r3, 0x3E
-	ldrb r1, [r3]
-	movs r2, 0x2
-	orrs r1, r2
-	strb r1, [r3]
-	movs r1, 0x3
-	ldrb r2, [r4, 0xC]
-	ands r2, r1
-	lsls r2, 2
-	ldrb r3, [r0, 0x5]
-	movs r1, 0xD
-	negs r1, r1
-	ands r1, r3
-	orrs r1, r2
-	strb r1, [r0, 0x5]
-	movs r1, 0xD
-	strh r1, [r0, 0x3C]
-	ldrb r1, [r4, 0x10]
-	bl StartSpriteAnim
-_08154B62:
-	movs r0, 0
-	pop {r4}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end sub_8154B04
-
-	thumb_func_start sub_8154B78
-sub_8154B78: @ 8154B78
-	push {r4,r5,lr}
-	ldr r4, =gFieldEffectArguments
-	adds r1, r4, 0x4
-	adds r0, r4, 0
-	movs r2, 0x8
-	movs r3, 0x8
-	bl sub_80930E0
-	ldr r0, =gFieldEffectObjectTemplatePointers
-	ldr r0, [r0, 0x5C]
-	movs r2, 0
-	ldrsh r1, [r4, r2]
-	movs r3, 0x4
-	ldrsh r2, [r4, r3]
-	ldrb r3, [r4, 0x8]
-	bl CreateSpriteAtEnd
-	lsls r0, 24
-	lsrs r1, r0, 24
-	adds r5, r1, 0
-	cmp r1, 0x40
-	beq _08154BD8
-	lsls r0, r1, 4
-	adds r0, r1
-	lsls r0, 2
-	ldr r1, =gSprites
-	adds r0, r1
-	adds r3, r0, 0
-	adds r3, 0x3E
-	ldrb r1, [r3]
-	movs r2, 0x2
-	orrs r1, r2
-	strb r1, [r3]
-	movs r1, 0x3
-	ldrb r2, [r4, 0xC]
-	ands r2, r1
-	lsls r2, 2
-	ldrb r3, [r0, 0x5]
-	movs r1, 0xD
-	negs r1, r1
-	ands r1, r3
-	orrs r1, r2
-	strb r1, [r0, 0x5]
-	movs r1, 0x18
-	strh r1, [r0, 0x3C]
-	ldrb r1, [r4, 0x10]
-	bl StartSpriteAnim
-_08154BD8:
-	adds r0, r5, 0
-	pop {r4,r5}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end sub_8154B78
-
-	thumb_func_start sub_8154BEC
-sub_8154BEC: @ 8154BEC
-	push {r4,r5,lr}
-	ldr r4, =gFieldEffectArguments
-	adds r1, r4, 0x4
-	adds r0, r4, 0
-	movs r2, 0x8
-	movs r3, 0x8
-	bl sub_80930E0
-	ldr r0, =gFieldEffectObjectTemplatePointers
-	ldr r0, [r0, 0x6C]
-	movs r2, 0
-	ldrsh r1, [r4, r2]
-	movs r3, 0x4
-	ldrsh r2, [r4, r3]
-	ldrb r3, [r4, 0x8]
-	bl CreateSpriteAtEnd
-	lsls r0, 24
-	lsrs r1, r0, 24
-	adds r5, r1, 0
-	cmp r1, 0x40
-	beq _08154C4C
-	lsls r0, r1, 4
-	adds r0, r1
-	lsls r0, 2
-	ldr r1, =gSprites
-	adds r0, r1
-	adds r3, r0, 0
-	adds r3, 0x3E
-	ldrb r1, [r3]
-	movs r2, 0x2
-	orrs r1, r2
-	strb r1, [r3]
-	movs r1, 0x3
-	ldrb r2, [r4, 0xC]
-	ands r2, r1
-	lsls r2, 2
-	ldrb r3, [r0, 0x5]
-	movs r1, 0xD
-	negs r1, r1
-	ands r1, r3
-	orrs r1, r2
-	strb r1, [r0, 0x5]
-	movs r1, 0x23
-	strh r1, [r0, 0x3C]
-	ldrb r1, [r4, 0x10]
-	bl StartSpriteAnim
-_08154C4C:
-	adds r0, r5, 0
-	pop {r4,r5}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end sub_8154BEC
-
 	thumb_func_start sub_8154C60
 sub_8154C60: @ 8154C60
 	push {lr}
diff --git a/data/field_effect_helpers.s b/data/field_effect_helpers.s
index 63fc1580e..a1edac00c 100644
--- a/data/field_effect_helpers.s
+++ b/data/field_effect_helpers.s
@@ -2,15 +2,8 @@
 	.include "constants/constants.inc"
 
 	.section .rodata
-
-gUnknown_085CDC38:: @ 85CDC38
-	.2byte 12, 28, 44
-
-gUnknown_085CDC3E:: @ 85CDC3E
-	.byte 0x00, 0x01, 0x02, 0x03
-
-gUnknown_085CDC42:: @ 85CDC42
-	.2byte 0x0004, 0x0004, 0x0004, 0x0010, 0x0000
+    
+    .align 2
 
 gUnknown_085CDC4C:: @ 85CDC4C
 	.4byte sub_8154C7C
diff --git a/include/event_object_movement.h b/include/event_object_movement.h
index d43dd78ea..97c41a519 100644
--- a/include/event_object_movement.h
+++ b/include/event_object_movement.h
@@ -80,6 +80,7 @@ struct LockedAnimEventObjects
 };
 
 extern const struct SpriteFrameImage gEventObjectPicTable_PechaBerryTree[];
+extern const u8 gReflectionEffectPaletteMap[];
 
 void sub_808D438(void);
 u8 GetMoveDirectionAnimNum(u8);
@@ -189,6 +190,8 @@ u8 GetMoveDirectionFasterAnimNum(u8);
 u8 GetMoveDirectionFastestAnimNum(u8);
 u8 GetLedgeJumpDirection(s16, s16, u8);
 void CameraObjectSetFollowedObjectId(u8 objectId);
+u16 GetObjectPaletteTag(u8 palSlot);
+void UpdateEventObjectSpriteVisibility(struct Sprite *sprite, bool8 invisible);
 
 void MovementType_None(struct Sprite *);
 void MovementType_LookAround(struct Sprite *);
@@ -249,6 +252,7 @@ u8 GetSlideMovementAction(u32);
 u8 GetJumpInPlaceMovementAction(u32);
 u8 GetJumpMovementAction(u32);
 u8 GetJump2MovementAction(u32);
+u8 CreateCopySpriteAt(struct Sprite *sprite, s16 x, s16 y, u8 subpriority);
 
 u8 MovementType_WanderAround_Step0(struct EventObject *, struct Sprite *);
 u8 MovementType_WanderAround_Step1(struct EventObject *, struct Sprite *);
diff --git a/ld_script.txt b/ld_script.txt
index 43a556034..15932d96c 100644
--- a/ld_script.txt
+++ b/ld_script.txt
@@ -201,6 +201,7 @@ SECTIONS {
         src/rom_81520A8.o(.text);
         src/save.o(.text);
         src/mystery_event_script.o(.text);
+        src/field_effect_helpers.o(.text);
         asm/field_effect_helpers.o(.text);
         src/contest_ai.o(.text);
         src/battle_anim_sound_tasks.o(.text);
@@ -491,6 +492,7 @@ SECTIONS {
         src/battle_message.o(.rodata);
         data/cable_car.o(.rodata);
         src/save.o(.rodata);
+        src/field_effect_helpers.o(.rodata);
         data/field_effect_helpers.o(.rodata);
         src/contest_ai.o(.rodata);
         src/battle_controller_safari.o(.rodata);
diff --git a/src/field_effect_helpers.c b/src/field_effect_helpers.c
new file mode 100755
index 000000000..37ff63258
--- /dev/null
+++ b/src/field_effect_helpers.c
@@ -0,0 +1,568 @@
+#include "global.h"
+#include "sprite.h"
+#include "fieldmap.h"
+#include "metatile_behavior.h"
+#include "sound.h"
+#include "event_object_movement.h"
+#include "field_camera.h"
+#include "field_weather.h"
+#include "field_effect.h"
+#include "field_effect_helpers.h"
+#include "constants/songs.h"
+
+void objc_reflection_maybe(struct Sprite *);
+void npc_pal_op(struct EventObject *eventObject, struct Sprite *sprite);
+void npc_pal_op_A(struct EventObject *, u8);
+void npc_pal_op_B(struct EventObject *, u8);
+void sub_81561FC(struct Sprite *, u8, u8);
+
+/*
+static void FadeFootprintsTireTracks_Step0(struct Sprite *);
+static void FadeFootprintsTireTracks_Step1(struct Sprite *);
+static void UpdateAshFieldEffect_Step0(struct Sprite *);
+static void UpdateAshFieldEffect_Step1(struct Sprite *);
+static void UpdateAshFieldEffect_Step2(struct Sprite *);
+static void UpdateFeetInFlowingWaterFieldEffect(struct Sprite *);
+static void sub_8127FD4(struct EventObject *, struct Sprite *);
+static void sub_812800C(struct EventObject *, struct Sprite *);
+static void sub_81280A0(struct EventObject *, struct Sprite *, struct Sprite *);
+static void sub_8128174(struct Sprite *);
+static u32 ShowDisguiseFieldEffect(u8, u8, u8); */
+
+void SetUpReflection(struct EventObject *eventObject, struct Sprite *sprite, bool8 stillReflection)
+{
+    struct Sprite *reflectionSprite;
+
+    reflectionSprite = &gSprites[CreateCopySpriteAt(sprite, sprite->pos1.x, sprite->pos1.y, 0x98)];
+    reflectionSprite->callback = objc_reflection_maybe;
+    reflectionSprite->oam.priority = 3;
+    reflectionSprite->oam.paletteNum = gReflectionEffectPaletteMap[reflectionSprite->oam.paletteNum];
+    reflectionSprite->usingSheet = TRUE;
+    reflectionSprite->anims = gDummySpriteAnimTable;
+    StartSpriteAnim(reflectionSprite, 0);
+    reflectionSprite->affineAnims = gDummySpriteAffineAnimTable;
+    reflectionSprite->affineAnimBeginning = TRUE;
+    reflectionSprite->subspriteMode = SUBSPRITES_OFF;
+    reflectionSprite->data[0] = sprite->data[0];
+    reflectionSprite->data[1] = eventObject->localId;
+    reflectionSprite->data[7] = stillReflection;
+    npc_pal_op(eventObject, reflectionSprite);
+
+    if (!stillReflection)
+        reflectionSprite->oam.affineMode = ST_OAM_AFFINE_NORMAL;
+}
+
+s16 sub_8153F98(struct EventObject *eventObject)
+{
+    return GetEventObjectGraphicsInfo(eventObject->graphicsId)->height - 2;
+}
+
+void npc_pal_op(struct EventObject *eventObject, struct Sprite *sprite)
+{
+    u8 bridgeType;
+    u16 bridgeReflectionVerticalOffsets[] = { 12, 28, 44 };
+    sprite->data[2] = 0;
+    if (!GetEventObjectGraphicsInfo(eventObject->graphicsId)->disableReflectionPaletteLoad && ((bridgeType = MetatileBehavior_GetBridgeSth(eventObject->previousMetatileBehavior)) || (bridgeType = MetatileBehavior_GetBridgeSth(eventObject->currentMetatileBehavior))))
+    {
+        sprite->data[2] = bridgeReflectionVerticalOffsets[bridgeType - 1];
+        npc_pal_op_A(eventObject, sprite->oam.paletteNum);
+    }
+    else
+    {
+        npc_pal_op_B(eventObject, sprite->oam.paletteNum);
+    }
+}
+
+void npc_pal_op_B(struct EventObject *eventObject, u8 paletteIndex)
+{
+    const struct EventObjectGraphicsInfo *graphicsInfo;
+
+    graphicsInfo = GetEventObjectGraphicsInfo(eventObject->graphicsId);
+    if (graphicsInfo->paletteTag2 != 0x11ff)
+    {
+        if (graphicsInfo->paletteSlot == 0)
+        {
+            LoadPlayerObjectReflectionPalette(graphicsInfo->paletteTag1, paletteIndex);
+        }
+        else if (graphicsInfo->paletteSlot == 10)
+        {
+            LoadSpecialObjectReflectionPalette(graphicsInfo->paletteTag1, paletteIndex);
+        }
+        else
+        {
+            PatchObjectPalette(GetObjectPaletteTag(paletteIndex), paletteIndex);
+        }
+        UpdateSpritePaletteWithWeather(paletteIndex);
+    }
+}
+
+// When walking on a bridge high above water (Route 120), the reflection is a solid dark blue color.
+// This is so the sprite blends in with the dark water metatile underneath the bridge.
+void npc_pal_op_A(struct EventObject *eventObject, u8 paletteNum)
+{
+    const struct EventObjectGraphicsInfo *graphicsInfo;
+
+    graphicsInfo = GetEventObjectGraphicsInfo(eventObject->graphicsId);
+    if (graphicsInfo->paletteTag2 != 0x11ff)
+    {
+        PatchObjectPalette(graphicsInfo->paletteTag2, paletteNum);
+        UpdateSpritePaletteWithWeather(paletteNum);
+    }
+}
+
+void objc_reflection_maybe(struct Sprite *reflectionSprite)
+{
+    struct EventObject *eventObject;
+    struct Sprite *mainSprite;
+
+    eventObject = &gEventObjects[reflectionSprite->data[0]];
+    mainSprite = &gSprites[eventObject->spriteId];
+    if (!eventObject->active || !eventObject->hasReflection || eventObject->localId != reflectionSprite->data[1])
+    {
+        reflectionSprite->inUse = FALSE;
+    }
+    else
+    {
+        reflectionSprite->oam.paletteNum = gReflectionEffectPaletteMap[mainSprite->oam.paletteNum];
+        reflectionSprite->oam.shape = mainSprite->oam.shape;
+        reflectionSprite->oam.size = mainSprite->oam.size;
+        reflectionSprite->oam.matrixNum = mainSprite->oam.matrixNum | 0x10;
+        reflectionSprite->oam.tileNum = mainSprite->oam.tileNum;
+        reflectionSprite->subspriteTables = mainSprite->subspriteTables;
+        reflectionSprite->subspriteTableNum = mainSprite->subspriteTableNum;
+        reflectionSprite->invisible = mainSprite->invisible;
+        reflectionSprite->pos1.x = mainSprite->pos1.x;
+        // reflectionSprite->data[2] holds an additional vertical offset, used by the high bridges on Route 120
+        reflectionSprite->pos1.y = mainSprite->pos1.y + sub_8153F98(eventObject) + reflectionSprite->data[2];
+        reflectionSprite->centerToCornerVecX = mainSprite->centerToCornerVecX;
+        reflectionSprite->centerToCornerVecY = mainSprite->centerToCornerVecY;
+        reflectionSprite->pos2.x = mainSprite->pos2.x;
+        reflectionSprite->pos2.y = -mainSprite->pos2.y;
+        reflectionSprite->coordOffsetEnabled = mainSprite->coordOffsetEnabled;
+        
+        if (eventObject->unk3_3 == TRUE)
+            reflectionSprite->invisible = TRUE;
+
+        // Check if the reflection is not still.
+        if (reflectionSprite->data[7] == FALSE)
+        {
+            // Sets the reflection sprite's rot/scale matrix to the appropriate
+            // matrix based on whether or not the main sprite is horizontally flipped.
+            // If the sprite is facing to the east, then it is flipped, and its matrixNum is 8.
+            reflectionSprite->oam.matrixNum = 0;
+            if (mainSprite->oam.matrixNum & 0x8)
+                reflectionSprite->oam.matrixNum = 1;
+        }
+    }
+}
+
+extern const struct SpriteTemplate *const gFieldEffectObjectTemplatePointers[];
+
+u8 sub_8154228(void)
+{
+    u8 spriteId;
+    struct Sprite *sprite;
+
+    spriteId = CreateSpriteAtEnd(gFieldEffectObjectTemplatePointers[8], 0, 0, 0x52);
+    if (spriteId != MAX_SPRITES)
+    {
+        sprite = &gSprites[spriteId];
+        sprite->oam.priority = 1;
+        sprite->coordOffsetEnabled = TRUE;
+        sprite->invisible = TRUE;
+    }
+    return spriteId;
+}
+
+void objid_set_invisible(u8 spriteId)
+{
+    gSprites[spriteId].invisible = TRUE;
+}
+
+void sub_8154298(u8 spriteId, u8 direction, s16 x, s16 y)
+{
+    s16 x2;
+    s16 y2;
+    struct Sprite *sprite;
+
+    sprite = &gSprites[spriteId];
+    if (sprite->invisible || sprite->data[0] != x || sprite->data[1] != y)
+    {
+        sub_8093038(x, y, &x2, &y2);
+        sprite = &gSprites[spriteId];
+        sprite->pos1.x = x2 + 8;
+        sprite->pos1.y = y2 + 8;
+        sprite->invisible = FALSE;
+        sprite->data[0] = x;
+        sprite->data[1] = y;
+        StartSpriteAnim(sprite, direction - 1);
+    }
+}
+
+const u8 gShadowEffectTemplateIds[] = {
+    0,
+    1,
+    2,
+    3
+};
+
+const u16 gShadowVerticalOffsets[] = {
+    4,
+    4,
+    4,
+    16
+};
+
+u32 oei_shadow(void)
+{
+    u8 eventObjectId;
+    const struct EventObjectGraphicsInfo *graphicsInfo;
+    u8 spriteId;
+
+    eventObjectId = GetEventObjectIdByLocalIdAndMap(gFieldEffectArguments[0], gFieldEffectArguments[1], gFieldEffectArguments[2]);
+    graphicsInfo = GetEventObjectGraphicsInfo(gEventObjects[eventObjectId].graphicsId);
+    spriteId = CreateSpriteAtEnd(gFieldEffectObjectTemplatePointers[gShadowEffectTemplateIds[graphicsInfo->shadowSize]], 0, 0, 0x94);
+    if (spriteId != MAX_SPRITES)
+    {
+        gSprites[spriteId].coordOffsetEnabled = TRUE;
+        gSprites[spriteId].data[0] = gFieldEffectArguments[0];
+        gSprites[spriteId].data[1] = gFieldEffectArguments[1];
+        gSprites[spriteId].data[2] = gFieldEffectArguments[2];
+        gSprites[spriteId].data[3] = (graphicsInfo->height >> 1) - gShadowVerticalOffsets[graphicsInfo->shadowSize];
+    }
+    return 0;
+}
+
+void oamc_shadow(struct Sprite *sprite)
+{
+    u8 eventObjectId;
+    struct EventObject *eventObject;
+    struct Sprite *linkedSprite;
+
+    if (TryGetEventObjectIdByLocalIdAndMap(sprite->data[0], sprite->data[1], sprite->data[2], &eventObjectId))
+    {
+        FieldEffectStop(sprite, FLDEFF_SHADOW);
+    }
+    else
+    {
+        eventObject = &gEventObjects[eventObjectId];
+        linkedSprite = &gSprites[eventObject->spriteId];
+        sprite->oam.priority = linkedSprite->oam.priority;
+        sprite->pos1.x = linkedSprite->pos1.x;
+        sprite->pos1.y = linkedSprite->pos1.y + sprite->data[3];
+        if (!eventObject->active || !eventObject->hasShadow
+         || MetatileBehavior_IsPokeGrass(eventObject->currentMetatileBehavior)
+         || MetatileBehavior_IsSurfableWaterOrUnderwater(eventObject->currentMetatileBehavior)
+         || MetatileBehavior_IsSurfableWaterOrUnderwater(eventObject->previousMetatileBehavior)
+         || MetatileBehavior_IsReflective(eventObject->currentMetatileBehavior)
+         || MetatileBehavior_IsReflective(eventObject->previousMetatileBehavior))
+        {
+            FieldEffectStop(sprite, FLDEFF_SHADOW);
+        }
+    }
+}
+
+u32 oei_grass_normal(void)
+{
+    s16 x;
+    s16 y;
+    u8 spriteId;
+    struct Sprite *sprite;
+
+    x = gFieldEffectArguments[0];
+    y = gFieldEffectArguments[1];
+    sub_80930E0(&x, &y, 8, 8);
+    spriteId = CreateSpriteAtEnd(gFieldEffectObjectTemplatePointers[4], x, y, 0);
+    if (spriteId != MAX_SPRITES)
+    {
+        sprite = &gSprites[spriteId];
+        sprite->coordOffsetEnabled = TRUE;
+        sprite->oam.priority = gFieldEffectArguments[3];
+        sprite->data[0] = gFieldEffectArguments[2];
+        sprite->data[1] = gFieldEffectArguments[0];
+        sprite->data[2] = gFieldEffectArguments[1];
+        sprite->data[3] = gFieldEffectArguments[4];
+        sprite->data[4] = gFieldEffectArguments[5];
+        sprite->data[5] = gFieldEffectArguments[6];
+        if (gFieldEffectArguments[7])
+        {
+            SeekSpriteAnim(sprite, 4);
+        }
+    }
+    return 0;
+}
+
+void unc_grass_normal(struct Sprite *sprite)
+{
+    u8 mapNum;
+    u8 mapGroup;
+    u8 metatileBehavior;
+    u8 localId;
+    u8 eventObjectId;
+    struct EventObject *eventObject;
+
+    mapNum = sprite->data[5] >> 8;
+    mapGroup = sprite->data[5];
+    if (gCamera.active && (gSaveBlock1Ptr->location.mapNum != mapNum || gSaveBlock1Ptr->location.mapGroup != mapGroup))
+    {
+        sprite->data[1] -= gCamera.x;
+        sprite->data[2] -= gCamera.y;
+        sprite->data[5] = ((u8)gSaveBlock1Ptr->location.mapNum << 8) | (u8)gSaveBlock1Ptr->location.mapGroup;
+    }
+    localId = sprite->data[3] >> 8;
+    mapNum = sprite->data[3];
+    mapGroup = sprite->data[4];
+    metatileBehavior = MapGridGetMetatileBehaviorAt(sprite->data[1], sprite->data[2]);
+    if (TryGetEventObjectIdByLocalIdAndMap(localId, mapNum, mapGroup, &eventObjectId) || !MetatileBehavior_IsTallGrass(metatileBehavior) || (sprite->data[7] && sprite->animEnded))
+    {
+        FieldEffectStop(sprite, FLDEFF_TALL_GRASS);
+    }
+    else
+    {
+        eventObject = &gEventObjects[eventObjectId];
+        if ((eventObject->currentCoords.x != sprite->data[1] || eventObject->currentCoords.y != sprite->data[2]) && (eventObject->previousCoords.x != sprite->data[1] || eventObject->previousCoords.y != sprite->data[2]))
+            sprite->data[7] = TRUE;
+
+        metatileBehavior = 0;
+        if (sprite->animCmdIndex == 0)
+            metatileBehavior = 4;
+
+        UpdateEventObjectSpriteVisibility(sprite, 0);
+        sub_81561FC(sprite, sprite->data[0], metatileBehavior);
+    }
+}
+
+u32 sub_8154658(void)
+{
+    u8 spriteId;
+    struct Sprite *sprite;
+
+    sub_80930E0((s16 *)&gFieldEffectArguments[0], (s16 *)&gFieldEffectArguments[1], 8, 12);
+    spriteId = CreateSpriteAtEnd(gFieldEffectObjectTemplatePointers[10], gFieldEffectArguments[0], gFieldEffectArguments[1], 0);
+    if (spriteId != MAX_SPRITES)
+    {
+        sprite = &gSprites[spriteId];
+        sprite->coordOffsetEnabled = TRUE;
+        sprite->oam.priority = gFieldEffectArguments[3];
+        sprite->data[0] = gFieldEffectArguments[2];
+        sprite->data[1] = 12;
+    }
+    return 0;
+}
+
+u8 sub_81546C8(u8 localId, u8 mapNum, u8 mapGroup, s16 x, s16 y)
+{
+    struct Sprite *sprite;
+    u8 i;
+
+    for (i = 0; i < MAX_SPRITES; i ++)
+    {
+        if (gSprites[i].inUse)
+        {
+            sprite = &gSprites[i];
+            if (sprite->callback == unc_grass_normal && (x == sprite->data[1] && y == sprite->data[2]) && (localId == (u8)(sprite->data[3] >> 8) && mapNum == (sprite->data[3] & 0xFF) && mapGroup == sprite->data[4]))
+                return i;
+        }
+    }
+
+    return MAX_SPRITES;
+}
+
+u32 sub_8154758(void)
+{
+    s16 x;
+    s16 y;
+    u8 spriteId;
+    struct Sprite *sprite;
+
+    x = gFieldEffectArguments[0];
+    y = gFieldEffectArguments[1];
+    sub_80930E0(&x, &y, 8, 8);
+    spriteId = CreateSpriteAtEnd(gFieldEffectObjectTemplatePointers[15], x, y, 0);
+    if (spriteId != MAX_SPRITES)
+    {
+        sprite = &gSprites[spriteId];
+        sprite->coordOffsetEnabled = TRUE;
+        sprite->oam.priority = ZCoordToPriority(gFieldEffectArguments[2]);
+        sprite->data[0] = gFieldEffectArguments[2];
+        sprite->data[1] = gFieldEffectArguments[0];
+        sprite->data[2] = gFieldEffectArguments[1];
+        sprite->data[3] = gFieldEffectArguments[4];
+        sprite->data[4] = gFieldEffectArguments[5];
+        sprite->data[5] = gFieldEffectArguments[6];
+        if (gFieldEffectArguments[7])
+        {
+            SeekSpriteAnim(sprite, 6);
+        }
+    }
+    return 0;
+}
+
+void unc_grass_tall(struct Sprite *sprite)
+{
+    u8 mapNum;
+    u8 mapGroup;
+    u8 metatileBehavior;
+    u8 localId;
+    u8 eventObjectId;
+    struct EventObject *eventObject;
+
+    mapNum = sprite->data[5] >> 8;
+    mapGroup = sprite->data[5];
+    if (gCamera.active && (gSaveBlock1Ptr->location.mapNum != mapNum || gSaveBlock1Ptr->location.mapGroup != mapGroup))
+    {
+        sprite->data[1] -= gCamera.x;
+        sprite->data[2] -= gCamera.y;
+        sprite->data[5] = ((u8)gSaveBlock1Ptr->location.mapNum << 8) | (u8)gSaveBlock1Ptr->location.mapGroup;
+    }
+    localId = sprite->data[3] >> 8;
+    mapNum = sprite->data[3];
+    mapGroup = sprite->data[4];
+    metatileBehavior = MapGridGetMetatileBehaviorAt(sprite->data[1], sprite->data[2]);
+    if (TryGetEventObjectIdByLocalIdAndMap(localId, mapNum, mapGroup, &eventObjectId) || !MetatileBehavior_IsLongGrass(metatileBehavior) || (sprite->data[7] && sprite->animEnded))
+    {
+        FieldEffectStop(sprite, FLDEFF_LONG_GRASS);
+    }
+    else
+    {
+        eventObject = &gEventObjects[eventObjectId];
+        if ((eventObject->currentCoords.x != sprite->data[1] || eventObject->currentCoords.y != sprite->data[2]) && (eventObject->previousCoords.x != sprite->data[1] || eventObject->previousCoords.y != sprite->data[2]))
+        {
+            sprite->data[7] = TRUE;
+        }
+        UpdateEventObjectSpriteVisibility(sprite, 0);
+        sub_81561FC(sprite, sprite->data[0], 0);
+    }
+}
+
+u32 sub_81548FC(void)
+{
+    u8 spriteId;
+    struct Sprite *sprite;
+
+    sub_80930E0((s16 *)&gFieldEffectArguments[0], (s16 *)&gFieldEffectArguments[1], 8, 8);
+    spriteId = CreateSpriteAtEnd(gFieldEffectObjectTemplatePointers[16], gFieldEffectArguments[0], gFieldEffectArguments[1], 0);
+    if (spriteId != MAX_SPRITES)
+    {
+        sprite = &gSprites[spriteId];
+        sprite->coordOffsetEnabled = TRUE;
+        sprite->oam.priority = gFieldEffectArguments[3];
+        sprite->data[0] = gFieldEffectArguments[2];
+        sprite->data[1] = 18;
+    }
+    return 0;
+}
+
+u32 sub_815496C(void)
+{
+    u8 eventObjectId;
+    struct EventObject *eventObject;
+    u8 spriteId;
+    struct Sprite *sprite;
+
+    eventObjectId = GetEventObjectIdByLocalIdAndMap(gFieldEffectArguments[0], gFieldEffectArguments[1], gFieldEffectArguments[2]);
+    eventObject = &gEventObjects[eventObjectId];
+    spriteId = CreateSpriteAtEnd(gFieldEffectObjectTemplatePointers[30], 0, 0, 0);
+    if (spriteId != MAX_SPRITES)
+    {
+        sprite = &(gSprites[spriteId]);
+        sprite->coordOffsetEnabled = TRUE;
+        sprite->oam.priority = gSprites[eventObject->spriteId].oam.priority;
+        sprite->data[0] = gFieldEffectArguments[0];
+        sprite->data[1] = gFieldEffectArguments[1];
+        sprite->data[2] = gFieldEffectArguments[2];
+        sprite->data[3] = gSprites[eventObject->spriteId].pos1.x;
+        sprite->data[4] = gSprites[eventObject->spriteId].pos1.y;
+    }
+    return 0;
+}
+
+void sub_8154A10(struct Sprite *sprite)
+{
+    u8 eventObjectId;
+    s16 x;
+    s16 y;
+    const struct EventObjectGraphicsInfo *graphicsInfo;
+    struct Sprite *linkedSprite;
+
+    if (TryGetEventObjectIdByLocalIdAndMap(sprite->data[0], sprite->data[1], sprite->data[2], &eventObjectId) || !gEventObjects[eventObjectId].inShortGrass)
+    {
+        FieldEffectStop(sprite, FLDEFF_SHORT_GRASS);
+    }
+    else
+    {
+        graphicsInfo = GetEventObjectGraphicsInfo(gEventObjects[eventObjectId].graphicsId);
+        linkedSprite = &gSprites[gEventObjects[eventObjectId].spriteId];
+        y = linkedSprite->pos1.y;
+        x = linkedSprite->pos1.x;
+        if (x != sprite->data[3] || y != sprite->data[4])
+        {
+            sprite->data[3] = x;
+            sprite->data[4] = y;
+            if (sprite->animEnded)
+            {
+                StartSpriteAnim(sprite, 0);
+            }
+        }
+        sprite->pos1.x = x;
+        sprite->pos1.y = y;
+        sprite->pos2.y = (graphicsInfo->height >> 1) - 8;
+        sprite->subpriority = linkedSprite->subpriority - 1;
+        sprite->oam.priority = linkedSprite->oam.priority;
+        UpdateEventObjectSpriteVisibility(sprite, linkedSprite->invisible);
+    }
+}
+
+u32 sub_8154B04(void)
+{
+    u8 spriteId;
+    struct Sprite *sprite;
+
+    sub_80930E0((s16 *)&gFieldEffectArguments[0], (s16 *)&gFieldEffectArguments[1], 8, 8);
+    spriteId = CreateSpriteAtEnd(gFieldEffectObjectTemplatePointers[11], gFieldEffectArguments[0], gFieldEffectArguments[1], gFieldEffectArguments[2]);
+    if (spriteId != MAX_SPRITES)
+    {
+        sprite = &gSprites[spriteId];
+        sprite->coordOffsetEnabled = TRUE;
+        sprite->oam.priority = gFieldEffectArguments[3];
+        sprite->data[7] = FLDEFF_SAND_FOOTPRINTS;
+        StartSpriteAnim(sprite, gFieldEffectArguments[4]);
+    }
+    return 0;
+}
+
+u32 sub_8154B78(void)
+{
+    u8 spriteId;
+    struct Sprite *sprite;
+
+    sub_80930E0((s16 *)&gFieldEffectArguments[0], (s16 *)&gFieldEffectArguments[1], 8, 8);
+    spriteId = CreateSpriteAtEnd(gFieldEffectObjectTemplatePointers[23], gFieldEffectArguments[0], gFieldEffectArguments[1], gFieldEffectArguments[2]);
+    if (spriteId != MAX_SPRITES)
+    {
+        sprite = &gSprites[spriteId];
+        sprite->coordOffsetEnabled = TRUE;
+        sprite->oam.priority = gFieldEffectArguments[3];
+        sprite->data[7] = FLDEFF_DEEP_SAND_FOOTPRINTS;
+        StartSpriteAnim(sprite, gFieldEffectArguments[4]);
+    }
+    return spriteId;
+}
+
+u32 sub_8154BEC(void)
+{
+    u8 spriteId;
+    struct Sprite *sprite;
+
+    sub_80930E0((s16 *)&gFieldEffectArguments[0], (s16 *)&gFieldEffectArguments[1], 8, 8);
+    spriteId = CreateSpriteAtEnd(gFieldEffectObjectTemplatePointers[27], gFieldEffectArguments[0], gFieldEffectArguments[1], gFieldEffectArguments[2]);
+    if (spriteId != MAX_SPRITES)
+    {
+        sprite = &gSprites[spriteId];
+        sprite->coordOffsetEnabled = TRUE;
+        sprite->oam.priority = gFieldEffectArguments[3];
+        sprite->data[7] = FLDEFF_BIKE_TIRE_TRACKS;
+        StartSpriteAnim(sprite, gFieldEffectArguments[4]);
+    }
+    return spriteId;
+}