Merge pull request #193 from DizzyEggg/decompile_scanline_effect

decompile scanline effect
author: Diegoisawesome <Diegoisawesome@users.noreply.github.com> 2018-01-30 15:37:34 -0600
committer: GitHub <noreply@github.com> 2018-01-30 15:37:34 -0600
commit: 232dea1a63929ce10f000ddc18c36c22a72827a4 (patch)
tree: 2b371cf05eec75a81eac09bdcbef80e8e91da278
parent: ef4313d42f38199f8420b985e4b2c7b96c62997d (diff)
parent: db3ecf5012612ed08aab55f4a8993afea74a4216 (diff)
34 files changed, 616 insertions, 964 deletions
diff --git a/asm/battle_anim_80FE840.s b/asm/battle_anim_80FE840.s
index 031bf2128..9a8b378ac 100644
--- a/asm/battle_anim_80FE840.s
+++ b/asm/battle_anim_80FE840.s
@@ -12802,7 +12802,7 @@ _08104EDC:
 	lsls r0, 16
 	cmp r2, r0
 	bgt _08104F1A
-	ldr r4, =gUnknown_02038C28
+	ldr r4, =gScanlineEffectRegBuffers
 	movs r0, 0xF0
 	lsls r0, 3
 	adds r6, r4, r0
@@ -12839,7 +12839,7 @@ _08104F1A:
 	ldr r0, [sp]
 	ldr r1, [sp, 0x4]
 	ldr r2, [sp, 0x8]
-	bl sub_80BA038
+	bl ScanlineEffect_SetParams
 	ldr r0, =sub_8104F54
 	str r0, [r5]
 	add sp, 0xC
@@ -12919,7 +12919,7 @@ _08104FCC:
 	ldrsh r0, [r3, r1]
 	cmp r0, 0
 	blt _08104FF0
-	ldr r2, =gUnknown_02038C28
+	ldr r2, =gScanlineEffectRegBuffers
 	lsls r0, 1
 	adds r0, r2
 	ldrh r1, [r3, 0x14]
@@ -12943,7 +12943,7 @@ _08104FF0:
 	ldrsh r1, [r3, r2]
 	cmp r0, r1
 	blt _0810500E
-	ldr r1, =gUnknown_02039B28
+	ldr r1, =gScanlineEffect
 	movs r0, 0x3
 	strb r0, [r1, 0x15]
 	adds r0, r4, 0
@@ -18518,7 +18518,7 @@ _08107D8C:
 	movs r3, 0
 	movs r2, 0x10
 	ldrsh r0, [r4, r2]
-	ldr r1, =gUnknown_02038C28
+	ldr r1, =gScanlineEffectRegBuffers
 	mov r12, r1
 	cmp r3, r0
 	bge _08107DCA
@@ -18555,7 +18555,7 @@ _08107DCA:
 	ldrsh r0, [r4, r3]
 	cmp r1, r0
 	bge _08107E04
-	ldr r5, =gUnknown_02038C28
+	ldr r5, =gScanlineEffectRegBuffers
 	movs r0, 0xF0
 	lsls r0, 3
 	adds r6, r5, r0
@@ -18584,7 +18584,7 @@ _08107E04:
 	asrs r0, r2, 16
 	cmp r0, 0x9F
 	bgt _08107E3A
-	ldr r5, =gUnknown_02038C28
+	ldr r5, =gScanlineEffectRegBuffers
 	movs r0, 0xF0
 	lsls r0, 3
 	adds r6, r5, r0
@@ -18652,7 +18652,7 @@ _08107E7A:
 	ldr r0, [sp]
 	ldr r1, [sp, 0x4]
 	ldr r2, [sp, 0x8]
-	bl sub_80BA038
+	bl ScanlineEffect_SetParams
 	ldrh r0, [r4, 0x8]
 	adds r0, 0x1
 	strh r0, [r4, 0x8]
@@ -18689,8 +18689,8 @@ _08107ED8:
 	ldrsh r0, [r4, r1]
 	cmp r3, r0
 	bge _08107F0C
-	ldr r6, =gUnknown_02038C28
-	ldr r5, =gUnknown_02039B28
+	ldr r6, =gScanlineEffectRegBuffers
+	ldr r5, =gScanlineEffect
 _08107EE6:
 	lsls r1, r3, 16
 	asrs r1, 16
@@ -18719,8 +18719,8 @@ _08107F0C:
 	ldrsh r0, [r4, r3]
 	cmp r1, r0
 	bge _08107F40
-	ldr r6, =gUnknown_02038C28
-	ldr r5, =gUnknown_02039B28
+	ldr r6, =gScanlineEffectRegBuffers
+	ldr r5, =gScanlineEffect
 _08107F1E:
 	asrs r3, r2, 16
 	lsls r2, r3, 1
@@ -18745,8 +18745,8 @@ _08107F40:
 	asrs r0, r1, 16
 	cmp r0, 0x9F
 	bgt _08108022
-	ldr r6, =gUnknown_02038C28
-	ldr r5, =gUnknown_02039B28
+	ldr r6, =gScanlineEffectRegBuffers
+	ldr r5, =gScanlineEffect
 _08107F4E:
 	asrs r3, r1, 16
 	lsls r2, r3, 1
@@ -18771,8 +18771,8 @@ _08107F78:
 	ldrsh r0, [r4, r1]
 	cmp r3, r0
 	bge _08107FAC
-	ldr r6, =gUnknown_02038C28
-	ldr r5, =gUnknown_02039B28
+	ldr r6, =gScanlineEffectRegBuffers
+	ldr r5, =gScanlineEffect
 _08107F86:
 	lsls r1, r3, 16
 	asrs r1, 16
@@ -18801,8 +18801,8 @@ _08107FAC:
 	ldrsh r0, [r4, r3]
 	cmp r1, r0
 	bge _08107FE0
-	ldr r6, =gUnknown_02038C28
-	ldr r5, =gUnknown_02039B28
+	ldr r6, =gScanlineEffectRegBuffers
+	ldr r5, =gScanlineEffect
 _08107FBE:
 	asrs r3, r2, 16
 	lsls r2, r3, 1
@@ -18827,8 +18827,8 @@ _08107FE0:
 	asrs r0, r1, 16
 	cmp r0, 0x9F
 	bgt _0810800C
-	ldr r6, =gUnknown_02038C28
-	ldr r5, =gUnknown_02039B28
+	ldr r6, =gScanlineEffectRegBuffers
+	ldr r5, =gScanlineEffect
 _08107FEE:
 	asrs r3, r1, 16
 	lsls r2, r3, 1
@@ -34618,7 +34618,7 @@ _0810FEC0:
 	adds r0, 0x40
 	cmp r1, r0
 	bgt _0810FEFA
-	ldr r5, =gUnknown_02038C28
+	ldr r5, =gScanlineEffectRegBuffers
 	movs r0, 0xF0
 	lsls r0, 3
 	adds r6, r5, r0
@@ -34651,7 +34651,7 @@ _0810FEFA:
 	ldr r0, [sp]
 	ldr r1, [sp, 0x4]
 	ldr r2, [sp, 0x8]
-	bl sub_80BA038
+	bl ScanlineEffect_SetParams
 	ldr r0, =sub_810FF34
 	str r0, [r4]
 	add sp, 0xC
@@ -34700,7 +34700,7 @@ _0810FF66:
 	ldr r0, =gSineTable
 	mov r9, r0
 	movs r7, 0x3
-	ldr r1, =gUnknown_02038C28
+	ldr r1, =gScanlineEffectRegBuffers
 	mov r12, r1
 	movs r2, 0xF0
 	lsls r2, 3
@@ -34775,7 +34775,7 @@ _0810FFFE:
 	ble _08110026
 	b _08110014
 _0811000E:
-	ldr r1, =gUnknown_02039B28
+	ldr r1, =gScanlineEffect
 	movs r0, 0x3
 	strb r0, [r1, 0x15]
 _08110014:
@@ -38728,7 +38728,7 @@ _08112054:
 _0811206C:
 	movs r2, 0x2
 	movs r3, 0x6
-	bl sub_80BA384
+	bl ScanlineEffect_InitWave
 	lsls r0, 24
 	lsrs r0, 24
 	strh r0, [r5, 0x1C]
@@ -38884,7 +38884,7 @@ _081121A8:
 	beq _081121F0
 	b _08112258
 _081121AE:
-	ldr r1, =gUnknown_02039B28
+	ldr r1, =gScanlineEffect
 	movs r0, 0x3
 	strb r0, [r1, 0x15]
 	movs r0, 0x1
@@ -41152,7 +41152,7 @@ _0811345A:
 	ldrsh r0, [r4, r1]
 	cmp r3, r0
 	bgt _08113488
-	ldr r5, =gUnknown_02038C28
+	ldr r5, =gScanlineEffectRegBuffers
 	movs r0, 0xF0
 	lsls r0, 3
 	adds r6, r5, r0
@@ -41175,7 +41175,7 @@ _08113488:
 	ldr r0, [sp]
 	ldr r1, [sp, 0x4]
 	ldr r2, [sp, 0x8]
-	bl sub_80BA038
+	bl ScanlineEffect_SetParams
 	ldr r0, =sub_81134B8
 	str r0, [r4]
 	add sp, 0xC
@@ -41264,7 +41264,7 @@ _0811354E:
 	bl sub_8113574
 	b _0811356E
 _08113556:
-	ldr r1, =gUnknown_02039B28
+	ldr r1, =gScanlineEffect
 	movs r0, 0x3
 	strb r0, [r1, 0x15]
 	ldrh r0, [r2, 0x8]
@@ -41292,11 +41292,11 @@ sub_8113574: @ 8113574
 	ldrsh r0, [r5, r1]
 	cmp r4, r0
 	bgt _081135CA
-	ldr r7, =gUnknown_02038C28
+	ldr r7, =gScanlineEffectRegBuffers
 	mov r12, r7
 	ldr r0, =gSineTable
 	mov r8, r0
-	ldr r6, =gUnknown_02039B28
+	ldr r6, =gScanlineEffect
 _08113592:
 	lsls r2, r4, 1
 	ldrb r1, [r6, 0x14]
@@ -42169,7 +42169,7 @@ _08113CB0:
 	movs r0, 0x3
 	bl sub_8114374
 	movs r3, 0
-	ldr r4, =gUnknown_02038C28
+	ldr r4, =gScanlineEffectRegBuffers
 	movs r0, 0xF0
 	lsls r0, 3
 	adds r6, r4, r0
@@ -42189,7 +42189,7 @@ _08113CDC:
 	ldr r0, [sp]
 	ldr r1, [sp, 0x4]
 	ldr r2, [sp, 0x8]
-	bl sub_80BA038
+	bl ScanlineEffect_SetParams
 	movs r0, 0x3F
 	eors r7, r0
 	movs r1, 0xFC
@@ -42344,7 +42344,7 @@ _08113E3E:
 	b _08113E5E
 	.pool
 _08113E58:
-	ldr r1, =gUnknown_02039B28
+	ldr r1, =gScanlineEffect
 	movs r0, 0x3
 	strb r0, [r1, 0x15]
 _08113E5E:
@@ -42534,7 +42534,7 @@ _08114002:
 	str r0, [sp, 0x10]
 	movs r3, 0
 	add r4, sp, 0x10
-	ldr r6, =gUnknown_02038C28
+	ldr r6, =gScanlineEffectRegBuffers
 	movs r0, 0xF0
 	lsls r0, 3
 	adds r7, r6, r0
@@ -42563,7 +42563,7 @@ _08114010:
 	strb r2, [r4, 0x9]
 	ldr r0, [sp, 0x10]
 	ldr r2, [r4, 0x8]
-	bl sub_80BA038
+	bl ScanlineEffect_SetParams
 _08114044:
 	ldrh r0, [r5, 0x8]
 	adds r0, 0x1
@@ -42772,7 +42772,7 @@ _081141DA:
 	bne _08114232
 	b _08114204
 _081141FE:
-	ldr r1, =gUnknown_02039B28
+	ldr r1, =gScanlineEffect
 	movs r0, 0x3
 	strb r0, [r1, 0x15]
 _08114204:
@@ -42827,9 +42827,9 @@ sub_8114244: @ 8114244
 	movs r4, 0
 	cmp r0, 0
 	ble _081142A4
-	ldr r0, =gUnknown_02038C28
+	ldr r0, =gScanlineEffectRegBuffers
 	mov r12, r0
-	ldr r7, =gUnknown_02039B28
+	ldr r7, =gScanlineEffect
 _08114278:
 	lsls r2, r4, 16
 	asrs r2, 16
@@ -42861,9 +42861,9 @@ _081142A4:
 	ldrsh r0, [r6, r2]
 	cmp r1, r0
 	bgt _081142EE
-	ldr r0, =gUnknown_02038C28
+	ldr r0, =gScanlineEffectRegBuffers
 	mov r12, r0
-	ldr r7, =gUnknown_02039B28
+	ldr r7, =gScanlineEffect
 _081142B8:
 	asrs r4, r3, 16
 	cmp r4, 0
@@ -42904,8 +42904,8 @@ _081142EE:
 	ldrsh r0, [r6, r3]
 	cmp r1, r0
 	bge _08114366
-	ldr r7, =gUnknown_02038C28
-	ldr r4, =gUnknown_02039B28
+	ldr r7, =gScanlineEffectRegBuffers
+	ldr r4, =gScanlineEffect
 _08114306:
 	asrs r3, r2, 16
 	cmp r3, 0
@@ -42935,7 +42935,7 @@ _08114338:
 	adds r5, r0, 0
 	adds r5, 0x9F
 	movs r4, 0
-	ldr r3, =gUnknown_02038C28
+	ldr r3, =gScanlineEffectRegBuffers
 	movs r2, 0xF0
 	lsls r2, 3
 	adds r6, r3, r2
@@ -44235,7 +44235,7 @@ _08114E4E:
 	b _08114E7E
 	.pool
 _08114E78:
-	ldr r1, =gUnknown_02039B28
+	ldr r1, =gScanlineEffect
 	movs r0, 0x3
 	strb r0, [r1, 0x15]
 _08114E7E:
@@ -44510,7 +44510,7 @@ _08115094:
 	ldrsh r0, [r0, r1]
 	cmp r0, 0
 	bne _081150DA
-	ldr r1, =gUnknown_02039B28
+	ldr r1, =gScanlineEffect
 	movs r0, 0x3
 	strb r0, [r1, 0x15]
 _081150C2:
@@ -44561,7 +44561,7 @@ _08115114:
 	asrs r4, r0, 16
 	cmp r2, r0
 	bge _08115140
-	ldr r5, =gUnknown_02038C28
+	ldr r5, =gScanlineEffectRegBuffers
 	movs r0, 0xF0
 	lsls r0, 3
 	adds r6, r5, r0
@@ -44584,7 +44584,7 @@ _08115140:
 	asrs r0, r1, 16
 	cmp r0, 0x9F
 	bgt _0811516E
-	ldr r4, =gUnknown_02038C28
+	ldr r4, =gScanlineEffectRegBuffers
 	lsls r0, r3, 16
 	asrs r0, 16
 	adds r3, r0, 0
@@ -44616,7 +44616,7 @@ _0811516E:
 	ldr r0, [sp]
 	ldr r1, [sp, 0x4]
 	ldr r2, [sp, 0x8]
-	bl sub_80BA038
+	bl ScanlineEffect_SetParams
 	add sp, 0xC
 	pop {r4-r6}
 	pop {r0}
@@ -50740,9 +50740,9 @@ _08118442:
 	strh r0, [r1, 0xC]
 _0811845A:
 	movs r3, 0
-	ldr r5, =gUnknown_02039B28
+	ldr r5, =gScanlineEffect
 	mov r9, r5
-	ldr r7, =gUnknown_02038C28
+	ldr r7, =gScanlineEffectRegBuffers
 	mov r6, r9
 	adds r5, r1, 0
 _08118466:
@@ -50760,8 +50760,8 @@ _08118466:
 	ble _08118466
 	cmp r3, 0x9F
 	bgt _081184AA
-	ldr r7, =gUnknown_02038C28
-	ldr r6, =gUnknown_02039B28
+	ldr r7, =gScanlineEffectRegBuffers
+	ldr r6, =gScanlineEffect
 	ldr r1, =gTasks
 	mov r2, r12
 	adds r0, r2, r4
@@ -51089,9 +51089,9 @@ _0811873C:
 	strh r0, [r1, 0xC]
 _08118752:
 	movs r3, 0
-	ldr r0, =gUnknown_02039B28
+	ldr r0, =gScanlineEffect
 	mov r8, r0
-	ldr r2, =gUnknown_02038C28
+	ldr r2, =gScanlineEffectRegBuffers
 	mov r12, r2
 	mov r7, r8
 	adds r4, r1, 0
@@ -51110,9 +51110,9 @@ _08118760:
 	ble _08118760
 	cmp r3, 0x9F
 	bgt _081187A4
-	ldr r0, =gUnknown_02038C28
+	ldr r0, =gScanlineEffectRegBuffers
 	mov r12, r0
-	ldr r7, =gUnknown_02039B28
+	ldr r7, =gScanlineEffect
 	ldr r1, =gTasks
 	adds r0, r6, r5
 	lsls r0, 3
@@ -51378,9 +51378,9 @@ _081189BA:
 	strh r0, [r1, 0xC]
 _081189D0:
 	movs r3, 0
-	ldr r6, =gUnknown_02039B28
+	ldr r6, =gScanlineEffect
 	mov r8, r6
-	ldr r7, =gUnknown_02038C28
+	ldr r7, =gScanlineEffectRegBuffers
 	adds r4, r1, 0
 _081189DA:
 	lsls r2, r3, 1
@@ -51397,8 +51397,8 @@ _081189DA:
 	ble _081189DA
 	cmp r3, 0x9F
 	bgt _08118A1E
-	ldr r7, =gUnknown_02038C28
-	ldr r6, =gUnknown_02039B28
+	ldr r7, =gScanlineEffectRegBuffers
+	ldr r6, =gScanlineEffect
 	ldr r1, =gTasks
 	mov r2, r12
 	adds r0, r2, r5
@@ -51707,9 +51707,9 @@ _08118C90:
 	strh r0, [r1, 0xC]
 _08118CA6:
 	movs r3, 0
-	ldr r0, =gUnknown_02039B28
+	ldr r0, =gScanlineEffect
 	mov r12, r0
-	ldr r2, =gUnknown_02038C28
+	ldr r2, =gScanlineEffectRegBuffers
 	mov r8, r2
 	mov r7, r12
 	adds r4, r1, 0
@@ -51728,9 +51728,9 @@ _08118CB4:
 	ble _08118CB4
 	cmp r3, 0x9F
 	bgt _08118CF8
-	ldr r0, =gUnknown_02038C28
+	ldr r0, =gScanlineEffectRegBuffers
 	mov r8, r0
-	ldr r7, =gUnknown_02039B28
+	ldr r7, =gScanlineEffect
 	ldr r1, =gTasks
 	adds r0, r5, r6
 	lsls r0, 3
@@ -52025,7 +52025,7 @@ _08118F28:
 	lsls r1, 7
 	movs r0, 0xC
 	bl SetGpuReg
-	ldr r1, =gUnknown_02039B28
+	ldr r1, =gScanlineEffect
 	movs r0, 0x3
 	strb r0, [r1, 0x15]
 	ldr r1, =gTasks
diff --git a/asm/battle_anim_815A0D4.s b/asm/battle_anim_815A0D4.s
index d583f1e85..f3b72792d 100644
--- a/asm/battle_anim_815A0D4.s
+++ b/asm/battle_anim_815A0D4.s
@@ -1689,7 +1689,7 @@ _0815AE58:
 	ldrsh r0, [r5, r6]
 	cmp r1, r0
 	bgt _0815AE8E
-	ldr r4, =gUnknown_02038C28
+	ldr r4, =gScanlineEffectRegBuffers
 	movs r0, 0xF0
 	lsls r0, 3
 	adds r0, r4
@@ -1729,7 +1729,7 @@ _0815AEA2:
 	ldr r0, [sp]
 	ldr r1, [sp, 0x4]
 	ldr r2, [sp, 0x8]
-	bl sub_80BA038
+	bl ScanlineEffect_SetParams
 	ldr r0, =sub_815AED8
 	str r0, [r5]
 	add sp, 0xC
@@ -1820,7 +1820,7 @@ _0815AF5C:
 	ldrsh r0, [r4, r2]
 	cmp r1, r0
 	bge _0815AF90
-	ldr r5, =gUnknown_02038C28
+	ldr r5, =gScanlineEffectRegBuffers
 	movs r0, 0xF0
 	lsls r0, 3
 	adds r6, r5, r0
@@ -1848,7 +1848,7 @@ _0815AF90:
 	ldrsh r0, [r4, r2]
 	cmp r1, r0
 	bgt _0815AFC4
-	ldr r5, =gUnknown_02038C28
+	ldr r5, =gScanlineEffectRegBuffers
 	movs r0, 0xF0
 	lsls r0, 3
 	adds r6, r5, r0
@@ -1877,7 +1877,7 @@ _0815AFC4:
 	ldrsh r0, [r4, r1]
 	cmp r0, 0
 	beq _0815AFDA
-	ldr r1, =gUnknown_02039B28
+	ldr r1, =gScanlineEffect
 	movs r0, 0x3
 	strb r0, [r1, 0x15]
 _0815AFDA:
@@ -6151,7 +6151,7 @@ _0815D316:
 	ldrh r3, [r0]
 	movs r7, 0
 	movs r2, 0
-	ldr r6, =gUnknown_02038C28
+	ldr r6, =gScanlineEffectRegBuffers
 	movs r0, 0xF0
 	lsls r0, 3
 	adds r0, r6
@@ -6192,7 +6192,7 @@ _0815D326:
 	ldr r0, [sp]
 	ldr r1, [sp, 0x4]
 	ldr r2, [sp, 0x8]
-	bl sub_80BA038
+	bl ScanlineEffect_SetParams
 	ldr r0, =sub_815D398
 	str r0, [r4]
 	add sp, 0xC
@@ -6304,7 +6304,7 @@ _0815D40E:
 	ldrsh r0, [r6, r3]
 	cmp r1, r0
 	ble _0815D52E
-	ldr r0, =gUnknown_02039B28
+	ldr r0, =gScanlineEffect
 	mov r10, r0
 	ldr r1, [sp, 0x4]
 	lsls r0, r1, 16
@@ -6325,7 +6325,7 @@ _0815D47E:
 	subs r0, r1
 	lsls r0, 7
 	adds r2, r0
-	ldr r0, =gUnknown_02038C28
+	ldr r0, =gScanlineEffectRegBuffers
 	adds r2, r0
 	lsls r4, 16
 	asrs r4, 16
@@ -6343,7 +6343,7 @@ _0815D47E:
 	subs r0, r1
 	lsls r0, 7
 	adds r3, r0
-	ldr r1, =gUnknown_02038C28
+	ldr r1, =gScanlineEffectRegBuffers
 	adds r3, r1
 	lsls r1, r7, 16
 	asrs r1, 16
@@ -6407,7 +6407,7 @@ _0815D52E:
 	lsls r1, r2, 17
 	cmp r1, 0
 	blt _0815D55A
-	ldr r4, =gUnknown_02038C28
+	ldr r4, =gScanlineEffectRegBuffers
 	ldr r7, [sp, 0x4]
 	lsls r0, r7, 16
 	asrs r0, 16
@@ -6487,7 +6487,7 @@ _0815D5CC:
 	asrs r0, 16
 	cmp r0, 0xC
 	ble _0815D63C
-	ldr r1, =gUnknown_02039B28
+	ldr r1, =gScanlineEffect
 	movs r0, 0x3
 	strb r0, [r1, 0x15]
 	movs r0, 0
diff --git a/asm/battle_frontier_1.s b/asm/battle_frontier_1.s
index 91c8215e5..31d5d3fbe 100644
--- a/asm/battle_frontier_1.s
+++ b/asm/battle_frontier_1.s
@@ -11000,8 +11000,8 @@ _0819486C:
 	movs r1, 0
 	strh r1, [r0, 0x8]
 _08194878:
-	bl dp12_8087EA4
-	ldr r0, =gUnknown_02038C28
+	bl ScanlineEffect_Clear
+	ldr r0, =gScanlineEffectRegBuffers
 	ldr r2, =0x00001f0a
 	movs r4, 0xF0
 	lsls r4, 3
@@ -11017,7 +11017,7 @@ _08194888:
 	bge _08194888
 	movs r5, 0x5B
 	ldr r3, =gUnknown_0860CF44
-	ldr r0, =gUnknown_02038C28
+	ldr r0, =gScanlineEffectRegBuffers
 	ldr r2, =0x00001f09
 	ldr r4, =0x00000836
 	adds r1, r0, r4
@@ -11033,7 +11033,7 @@ _081948A4:
 	ldr r0, [r3]
 	ldr r1, [r3, 0x4]
 	ldr r2, [r3, 0x8]
-	bl sub_80BA038
+	bl ScanlineEffect_SetParams
 	mov r0, r8
 	bl DestroyTask
 _081948C2:
@@ -11513,7 +11513,7 @@ sub_8194CE4: @ 8194CE4
 	bl LoadOam
 	bl ProcessSpriteCopyRequests
 	bl TransferPlttBuffer
-	bl sub_80BA0A8
+	bl ScanlineEffect_InitHBlankDmaTransfer
 	pop {r0}
 	bx r0
 	.pool
diff --git a/asm/contest.s b/asm/contest.s
index 3c34965ad..e81ce8d5c 100644
--- a/asm/contest.s
+++ b/asm/contest.s
@@ -563,7 +563,7 @@ _080D7B4E:
 	bl sub_80D779C
 	bl sub_80D77E4
 	bl sub_80D7678
-	bl dp12_8087EA4
+	bl ScanlineEffect_Clear
 	bl ResetPaletteFade
 	ldr r2, =gPaletteFade
 	ldrb r0, [r2, 0x8]
@@ -1367,7 +1367,7 @@ vblank_cb_battle: @ 80D827C
 	bl TransferPlttBuffer
 	bl LoadOam
 	bl ProcessSpriteCopyRequests
-	bl sub_80BA0A8
+	bl ScanlineEffect_InitHBlankDmaTransfer
 	pop {r0}
 	bx r0
 	.pool
diff --git a/asm/contest_link_80F57C4.s b/asm/contest_link_80F57C4.s
index 55503fde1..e73c657a9 100644
--- a/asm/contest_link_80F57C4.s
+++ b/asm/contest_link_80F57C4.s
@@ -344,7 +344,7 @@ sub_80F5B00: @ 80F5B00
 	bl SetVBlankCallback
 	bl sub_80F7DF4
 	bl sub_80F57C4
-	bl dp12_8087EA4
+	bl ScanlineEffect_Clear
 	bl ResetPaletteFade
 	bl ResetSpriteData
 	bl ResetTasks
@@ -492,7 +492,7 @@ sub_80F5C24: @ 80F5C24
 	bl LoadOam
 	bl ProcessSpriteCopyRequests
 	bl TransferPlttBuffer
-	bl sub_80BA0A8
+	bl ScanlineEffect_InitHBlankDmaTransfer
 	pop {r0}
 	bx r0
 	.pool
diff --git a/asm/field_screen.s b/asm/field_screen.s
index 5e9452d71..1b6716d3c 100644
--- a/asm/field_screen.s
+++ b/asm/field_screen.s
@@ -9572,12 +9572,12 @@ _080AFE30:
 	beq _080AFEBC
 	b _080AFEC6
 _080AFE36:
-	ldr r0, =gUnknown_02039B28
+	ldr r0, =gScanlineEffect
 	ldrb r1, [r0, 0x14]
 	lsls r0, r1, 4
 	subs r0, r1
 	lsls r0, 7
-	ldr r1, =gUnknown_02038C28
+	ldr r1, =gScanlineEffectRegBuffers
 	adds r0, r1
 	movs r2, 0x2
 	ldrsh r1, [r4, r2]
@@ -9591,12 +9591,12 @@ _080AFE36:
 	b _080AFEC6
 	.pool
 _080AFE64:
-	ldr r0, =gUnknown_02039B28
+	ldr r0, =gScanlineEffect
 	ldrb r1, [r0, 0x14]
 	lsls r0, r1, 4
 	subs r0, r1
 	lsls r0, 7
-	ldr r1, =gUnknown_02038C28
+	ldr r1, =gScanlineEffectRegBuffers
 	adds r0, r1
 	movs r6, 0x2
 	ldrsh r1, [r4, r6]
@@ -9631,7 +9631,7 @@ _080AFEB4:
 	bl DestroyTask
 	b _080AFEC6
 _080AFEBC:
-	bl dp12_8087EA4
+	bl ScanlineEffect_Clear
 	adds r0, r5, 0
 	bl DestroyTask
 _080AFEC6:
@@ -9665,12 +9665,12 @@ _080AFEF4:
 	beq _080AFF80
 	b _080AFF8A
 _080AFEFA:
-	ldr r0, =gUnknown_02039B28
+	ldr r0, =gScanlineEffect
 	ldrb r1, [r0, 0x14]
 	lsls r0, r1, 4
 	subs r0, r1
 	lsls r0, 7
-	ldr r1, =gUnknown_02038C28
+	ldr r1, =gScanlineEffectRegBuffers
 	adds r0, r1
 	movs r2, 0x2
 	ldrsh r1, [r4, r2]
@@ -9684,12 +9684,12 @@ _080AFEFA:
 	b _080AFF8A
 	.pool
 _080AFF28:
-	ldr r0, =gUnknown_02039B28
+	ldr r0, =gScanlineEffect
 	ldrb r1, [r0, 0x14]
 	lsls r0, r1, 4
 	subs r0, r1
 	lsls r0, 7
-	ldr r1, =gUnknown_02038C28
+	ldr r1, =gScanlineEffectRegBuffers
 	adds r0, r1
 	movs r6, 0x2
 	ldrsh r1, [r4, r6]
@@ -9724,7 +9724,7 @@ _080AFF78:
 	bl DestroyTask
 	b _080AFF8A
 _080AFF80:
-	bl dp12_8087EA4
+	bl ScanlineEffect_Clear
 	adds r0, r5, 0
 	bl DestroyTask
 _080AFF8A:
@@ -9914,7 +9914,7 @@ sub_80B00E8: @ 80B00E8
 	lsrs r0, 24
 	cmp r0, 0
 	beq _080B0116
-	ldr r4, =gUnknown_02038C28
+	ldr r4, =gScanlineEffectRegBuffers
 	ldr r1, =gUnknown_0854FE64
 	lsls r0, 1
 	adds r0, r1
@@ -9940,7 +9940,7 @@ _080B0116:
 	thumb_func_start door_upload_tiles
 door_upload_tiles: @ 80B0124
 	push {r4,lr}
-	ldr r4, =gUnknown_02038C28
+	ldr r4, =gScanlineEffectRegBuffers
 	ldr r0, =gSaveBlock2Ptr
 	ldr r0, [r0]
 	ldr r1, =0x00000e68
@@ -10261,7 +10261,7 @@ _080B0368:
 	bl sub_8199C30
 	movs r0, 0
 	bl schedule_bg_copy_tilemap_to_vram
-	ldr r4, =gUnknown_02038C28
+	ldr r4, =gScanlineEffectRegBuffers
 	movs r2, 0x4
 	ldrsh r1, [r5, r2]
 	movs r0, 0x6
@@ -10280,7 +10280,7 @@ _080B0368:
 	ldr r0, [r2]
 	ldr r1, [r2, 0x4]
 	ldr r2, [r2, 0x8]
-	bl sub_80BA038
+	bl ScanlineEffect_SetParams
 	movs r0, 0x1
 	strh r0, [r5]
 	b _080B052C
diff --git a/asm/intro.s b/asm/intro.s
index efc36e7d9..3e95c6ec7 100644
--- a/asm/intro.s
+++ b/asm/intro.s
@@ -11,7 +11,7 @@ sub_816CBE8: @ 816CBE8
 	bl LoadOam
 	bl ProcessSpriteCopyRequests
 	bl TransferPlttBuffer
-	bl sub_80BA0A8
+	bl ScanlineEffect_InitHBlankDmaTransfer
 	pop {r0}
 	bx r0
 	thumb_func_end sub_816CBE8
@@ -2124,7 +2124,7 @@ task_intro_17: @ 816DEEC
 	movs r1, 0xA0
 	movs r2, 0x4
 	movs r3, 0x4
-	bl sub_80BA384
+	bl ScanlineEffect_InitWave
 	add sp, 0xC
 	pop {r0}
 	bx r0
@@ -2411,7 +2411,7 @@ _0816E156:
 	adds r0, r1
 	ldr r1, =task_intro_19
 	str r1, [r0]
-	ldr r1, =gUnknown_02039B28
+	ldr r1, =gScanlineEffect
 	movs r0, 0x3
 	strb r0, [r1, 0x15]
 _0816E176:
@@ -2623,7 +2623,7 @@ task_intro_19: @ 816E2A0
 	movs r1, 0xA0
 	movs r2, 0x4
 	movs r3, 0x4
-	bl sub_80BA384
+	bl ScanlineEffect_InitWave
 	add sp, 0xC
 	pop {r4}
 	pop {r0}
@@ -3038,7 +3038,7 @@ _0816E69C:
 	adds r0, r1
 	ldr r1, =task_intro_21
 	str r1, [r0]
-	ldr r1, =gUnknown_02039B28
+	ldr r1, =gScanlineEffect
 	movs r0, 0x3
 	strb r0, [r1, 0x15]
 _0816E6BC:
diff --git a/asm/link.s b/asm/link.s
index 76c6521cf..f794ffca3 100644
--- a/asm/link.s
+++ b/asm/link.s
@@ -39837,7 +39837,7 @@ sub_801DF20: @ 801DF20
 	bl TransferPlttBuffer
 	bl LoadOam
 	bl ProcessSpriteCopyRequests
-	bl sub_80BA0A8
+	bl ScanlineEffect_InitHBlankDmaTransfer
 	pop {r0}
 	bx r0
 	thumb_func_end sub_801DF20
@@ -42568,7 +42568,7 @@ sub_801F544: @ 801F544
 	str r0, [r4]
 _0801F55A:
 	bl FreeAllWindowBuffers
-	ldr r1, =gUnknown_02039B28
+	ldr r1, =gScanlineEffect
 	movs r0, 0x3
 	strb r0, [r1, 0x15]
 	pop {r4}
@@ -44875,13 +44875,13 @@ sub_8020770: @ 8020770
 	strh r1, [r0, 0x20]
 	str r1, [sp, 0xC]
 	add r0, sp, 0xC
-	ldr r1, =gUnknown_02038C28
+	ldr r1, =gScanlineEffectRegBuffers
 	ldr r2, =0x010003c0
 	bl CpuFastSet
 	ldr r0, [sp]
 	ldr r1, [sp, 0x4]
 	ldr r2, [sp, 0x8]
-	bl sub_80BA038
+	bl ScanlineEffect_SetParams
 	add sp, 0x10
 	pop {r0}
 	bx r0
@@ -44896,12 +44896,12 @@ sub_80207C0: @ 80207C0
 	lsrs r0, 16
 	mov r1, sp
 	strh r0, [r1]
-	ldr r5, =gUnknown_02039B28
+	ldr r5, =gScanlineEffect
 	ldrb r0, [r5, 0x14]
 	lsls r1, r0, 4
 	subs r1, r0
 	lsls r1, 7
-	ldr r4, =gUnknown_02038C28
+	ldr r4, =gScanlineEffectRegBuffers
 	adds r1, r4
 	ldr r2, =0x01000090
 	mov r0, sp
@@ -44939,7 +44939,7 @@ sub_8020818: @ 8020818
 	lsrs r4, 16
 	mov r0, sp
 	strh r4, [r0]
-	ldr r5, =gUnknown_02038C28
+	ldr r5, =gScanlineEffectRegBuffers
 	ldr r0, =0x01000090
 	mov r9, r0
 	mov r0, sp
diff --git a/asm/overworld.s b/asm/overworld.s
index 3e041d25f..855d33860 100644
--- a/asm/overworld.s
+++ b/asm/overworld.s
@@ -3637,7 +3637,7 @@ VBlankCB_Field: @ 8086390
 	push {lr}
 	bl LoadOam
 	bl ProcessSpriteCopyRequests
-	bl sub_80BA0A8
+	bl ScanlineEffect_InitHBlankDmaTransfer
 	bl FieldUpdateBgTilemapScroll
 	bl TransferPlttBuffer
 	bl TransferTilesetAnimsBuffer
@@ -3657,7 +3657,7 @@ sub_80863B0: @ 80863B0
 	ldr r0, [r2]
 	ldr r1, [r2, 0x4]
 	ldr r2, [r2, 0x8]
-	bl sub_80BA038
+	bl ScanlineEffect_SetParams
 	b _080863F0
 	.pool
 _080863D4:
@@ -3671,7 +3671,7 @@ _080863D4:
 	ldr r0, [r2]
 	ldr r1, [r2, 0x4]
 	ldr r2, [r2, 0x8]
-	bl sub_80BA038
+	bl ScanlineEffect_SetParams
 _080863F0:
 	pop {r0}
 	bx r0
@@ -4294,7 +4294,7 @@ sub_8086988: @ 8086988
 	bl ResetTasks
 	bl ResetSpriteData
 	bl ResetPaletteFade
-	bl dp12_8087EA4
+	bl ScanlineEffect_Clear
 	bl dp13_810BB8C
 	bl ResetCameraUpdateInfo
 	bl InstallCameraPanAheadCallback
diff --git a/asm/pokenav.s b/asm/pokenav.s
index 52fe65d65..35d6a40d5 100644
--- a/asm/pokenav.s
+++ b/asm/pokenav.s
@@ -7068,7 +7068,7 @@ sub_81CA914: @ 81CA914
 	bl TransferPlttBuffer
 	bl LoadOam
 	bl ProcessSpriteCopyRequests
-	bl sub_80BA0A8
+	bl ScanlineEffect_InitHBlankDmaTransfer
 	pop {r0}
 	bx r0
 	thumb_func_end sub_81CA914
@@ -7101,7 +7101,7 @@ titlescreen_0: @ 81CA92C
 	ldr r0, [r2]
 	ldr r1, [r2, 0x4]
 	ldr r2, [r2, 0x8]
-	bl sub_80BA038
+	bl ScanlineEffect_SetParams
 	ldr r0, =sub_81CA914
 	bl c3args_set_0toR1_1to0
 	ldr r0, =sub_81CA9EC
@@ -7220,7 +7220,7 @@ sub_81CAA3C: @ 81CAA3C
 	mov r0, sp
 	movs r6, 0
 	strh r6, [r0]
-	ldr r5, =gUnknown_02038C28
+	ldr r5, =gScanlineEffectRegBuffers
 	ldr r0, =0x010000a0
 	mov r8, r0
 	mov r0, sp
@@ -15647,7 +15647,7 @@ sub_81CEE44: @ 81CEE44
 	bl TransferPlttBuffer
 	adds r0, r4, 0
 	bl sub_81D2108
-	bl sub_80BA0A8
+	bl ScanlineEffect_InitHBlankDmaTransfer
 	pop {r4}
 	pop {r0}
 	bx r0
@@ -22318,7 +22318,7 @@ sub_81D20BC: @ 81D20BC
 	b _081D20FA
 	.pool
 _081D20D4:
-	bl dp12_8087EA4
+	bl ScanlineEffect_Clear
 	ldrb r0, [r4]
 	adds r0, 0x1
 	strb r0, [r4]
@@ -22332,7 +22332,7 @@ _081D20E2:
 	ldr r0, [sp]
 	ldr r1, [sp, 0x4]
 	ldr r2, [sp, 0x8]
-	bl sub_80BA038
+	bl ScanlineEffect_SetParams
 	ldrb r0, [r4]
 	adds r0, 0x1
 	strb r0, [r4]
@@ -22366,7 +22366,7 @@ sub_81D2108: @ 81D2108
 	adds r0, r6, 0
 	bl sub_81D2634
 	movs r7, 0
-	ldr r5, =gUnknown_02038C28
+	ldr r5, =gScanlineEffectRegBuffers
 	mov r12, r5
 	movs r0, 0xF0
 	lsls r0, 3
diff --git a/asm/rayquaza_scene.s b/asm/rayquaza_scene.s
index f60b2a252..8832d3942 100644
--- a/asm/rayquaza_scene.s
+++ b/asm/rayquaza_scene.s
@@ -1058,7 +1058,7 @@ _081D6FC8:
 sub_81D6FD0: @ 81D6FD0
 	push {lr}
 	bl sub_81D67EC
-	bl sub_80BA0A8
+	bl ScanlineEffect_InitHBlankDmaTransfer
 	pop {r0}
 	bx r0
 	thumb_func_end sub_81D6FD0
@@ -1183,12 +1183,12 @@ sub_81D7134: @ 81D7134
 	lsls r6, r1, 3
 	ldr r7, =gTasks + 0x8
 	adds r5, r6, r7
-	bl dp12_8087EA4
+	bl ScanlineEffect_Clear
 	bl sub_81D6FE0
 	bl sub_81D706C
 	movs r4, 0
 	str r4, [sp, 0x4]
-	ldr r1, =gUnknown_02038C28
+	ldr r1, =gScanlineEffectRegBuffers
 	ldr r2, =0x010003c0
 	add r0, sp, 0x4
 	bl CpuFastSet
@@ -1196,7 +1196,7 @@ sub_81D7134: @ 81D7134
 	ldr r0, [r2]
 	ldr r1, [r2, 0x4]
 	ldr r2, [r2, 0x8]
-	bl sub_80BA038
+	bl ScanlineEffect_SetParams
 	strh r4, [r5]
 	ldr r0, =sub_81D7228
 	movs r1, 0
@@ -1278,7 +1278,7 @@ sub_81D7228: @ 81D7228
 	adds r3, r1, r0
 	movs r1, 0x18
 	ldr r7, =gUnknown_0203CF60
-	ldr r4, =gUnknown_02038C28
+	ldr r4, =gScanlineEffectRegBuffers
 	movs r0, 0xF0
 	lsls r0, 3
 	adds r5, r4, r0
diff --git a/asm/reset_rtc_screen.s b/asm/reset_rtc_screen.s
index ab5e0840c..b314afbf5 100644
--- a/asm/reset_rtc_screen.s
+++ b/asm/reset_rtc_screen.s
@@ -888,7 +888,7 @@ _0809EFCA:
 	bl ResetOamRange
 	bl LoadOam
 	bl ScanlineEffect_Stop
-	bl dp12_8087EA4
+	bl ScanlineEffect_Clear
 	bl ResetSpriteData
 	bl ResetTasks
 	bl ResetPaletteFade
diff --git a/asm/start_menu.s b/asm/start_menu.s
index 93bef1ef2..b99ed84ce 100644
--- a/asm/start_menu.s
+++ b/asm/start_menu.s
@@ -1561,7 +1561,7 @@ _080A0490:
 	bl ResetSpriteData
 	bl ResetTasks
 	bl ResetPaletteFade
-	bl dp12_8087EA4
+	bl ScanlineEffect_Clear
 	b _080A04FC
 _080A04A2:
 	movs r0, 0
diff --git a/asm/title_screen.s b/asm/title_screen.s
index 54c1b5353..32594424a 100644
--- a/asm/title_screen.s
+++ b/asm/title_screen.s
@@ -464,7 +464,7 @@ _080AA766:
 @ void title_screen_vblank_callback()
 title_screen_vblank_callback: @ 80AA780
 	push {lr}
-	bl sub_80BA0A8
+	bl ScanlineEffect_InitHBlankDmaTransfer
 	bl LoadOam
 	bl ProcessSpriteCopyRequests
 	bl TransferPlttBuffer
@@ -779,7 +779,7 @@ _080AAAF0:
 	movs r1, 0xA0
 	movs r2, 0x4
 	movs r3, 0x4
-	bl sub_80BA384
+	bl ScanlineEffect_InitWave
 	ldr r0, =c2_title_screen_2
 	bl SetMainCallback2
 _080AAB1E:
diff --git a/asm/trainer_card.s b/asm/trainer_card.s
index f1679d04e..fe6133618 100644
--- a/asm/trainer_card.s
+++ b/asm/trainer_card.s
@@ -18,7 +18,7 @@ sub_80C2690: @ 80C2690
 	cmp r0, 0
 	beq _080C26C0
 	ldr r1, =0x040000d4
-	ldr r0, =gUnknown_02038C28
+	ldr r0, =gScanlineEffectRegBuffers
 	str r0, [r1]
 	movs r2, 0xF0
 	lsls r2, 3
@@ -40,7 +40,7 @@ sub_80C26D4: @ 80C26D4
 	ldrh r3, [r4]
 	movs r0, 0
 	strh r0, [r4]
-	ldr r1, =gUnknown_02038C28
+	ldr r1, =gScanlineEffectRegBuffers
 	ldr r0, =0x04000006
 	ldrh r2, [r0]
 	movs r0, 0xFF
@@ -3977,9 +3977,9 @@ sub_80C4998: @ 80C4998
 	movs r0, 0x3
 	bl HideBg
 	bl ScanlineEffect_Stop
-	bl dp12_8087EA4
+	bl ScanlineEffect_Clear
 	movs r1, 0
-	ldr r0, =gUnknown_02038C28
+	ldr r0, =gScanlineEffectRegBuffers
 	movs r2, 0
 	movs r3, 0xF0
 	lsls r3, 3
@@ -4066,7 +4066,7 @@ _080C4A0E:
 	movs r2, 0
 	cmp r2, r7
 	bcs _080C4A78
-	ldr r3, =gUnknown_02038C28
+	ldr r3, =gScanlineEffectRegBuffers
 _080C4A60:
 	lsls r0, r2, 16
 	asrs r0, 16
@@ -4091,7 +4091,7 @@ _080C4A78:
 	lsrs r7, r4, 16
 	cmp r1, r0
 	bge _080C4AB0
-	ldr r0, =gUnknown_02038C28
+	ldr r0, =gScanlineEffectRegBuffers
 	mov r12, r0
 	adds r4, r3, 0
 _080C4A92:
@@ -4116,7 +4116,7 @@ _080C4AB0:
 	asrs r0, r1, 16
 	cmp r0, 0x9F
 	bgt _080C4ACE
-	ldr r2, =gUnknown_02038C28
+	ldr r2, =gScanlineEffectRegBuffers
 _080C4ABC:
 	asrs r0, r1, 16
 	lsls r1, r0, 1
@@ -4392,7 +4392,7 @@ _080C4CB6:
 	movs r2, 0
 	cmp r2, r7
 	bcs _080C4D20
-	ldr r3, =gUnknown_02038C28
+	ldr r3, =gScanlineEffectRegBuffers
 _080C4D08:
 	lsls r0, r2, 16
 	asrs r0, 16
@@ -4417,7 +4417,7 @@ _080C4D20:
 	lsrs r7, r4, 16
 	cmp r1, r0
 	bge _080C4D56
-	ldr r0, =gUnknown_02038C28
+	ldr r0, =gScanlineEffectRegBuffers
 	mov r12, r0
 	adds r4, r3, 0
 _080C4D3A:
@@ -4441,7 +4441,7 @@ _080C4D56:
 	asrs r0, r1, 16
 	cmp r0, 0x9F
 	bgt _080C4D74
-	ldr r2, =gUnknown_02038C28
+	ldr r2, =gScanlineEffectRegBuffers
 _080C4D62:
 	asrs r0, r1, 16
 	lsls r1, r0, 1
diff --git a/asm/unknown_task.s b/asm/unknown_task.s
deleted file mode 100644
index a8672ac8f..000000000
--- a/asm/unknown_task.s
+++ /dev/null
@@ -1,593 +0,0 @@
-	.include "asm/macros.inc"
-	.include "constants/constants.inc"
-
-	.syntax unified
-
-	.text
-
-	thumb_func_start ScanlineEffect_Stop
-ScanlineEffect_Stop: @ 80B9FB8
-	push {r4,lr}
-	ldr r4, =gUnknown_02039B28
-	movs r0, 0
-	strb r0, [r4, 0x15]
-	ldr r1, =0x040000b0
-	ldrh r2, [r1, 0xA]
-	ldr r0, =0x0000c5ff
-	ands r0, r2
-	strh r0, [r1, 0xA]
-	ldrh r2, [r1, 0xA]
-	ldr r0, =0x00007fff
-	ands r0, r2
-	strh r0, [r1, 0xA]
-	ldrh r0, [r1, 0xA]
-	ldrb r0, [r4, 0x18]
-	cmp r0, 0xFF
-	beq _080B9FE2
-	bl DestroyTask
-	movs r0, 0xFF
-	strb r0, [r4, 0x18]
-_080B9FE2:
-	pop {r4}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end ScanlineEffect_Stop
-
-	thumb_func_start dp12_8087EA4
-dp12_8087EA4: @ 80B9FF8
-	push {r4,lr}
-	sub sp, 0x4
-	mov r0, sp
-	movs r4, 0
-	strh r4, [r0]
-	ldr r1, =gUnknown_02038C28
-	ldr r2, =0x01000780
-	bl CpuSet
-	ldr r0, =gUnknown_02039B28
-	movs r1, 0
-	str r1, [r0]
-	str r1, [r0, 0x4]
-	str r1, [r0, 0x8]
-	str r1, [r0, 0xC]
-	strb r4, [r0, 0x14]
-	strb r4, [r0, 0x15]
-	strb r4, [r0, 0x16]
-	strb r4, [r0, 0x17]
-	movs r1, 0xFF
-	strb r1, [r0, 0x18]
-	add sp, 0x4
-	pop {r4}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end dp12_8087EA4
-
-	thumb_func_start sub_80BA038
-sub_80BA038: @ 80BA038
-	push {lr}
-	sub sp, 0xC
-	str r0, [sp]
-	str r1, [sp, 0x4]
-	str r2, [sp, 0x8]
-	ldr r0, =0xa2600001
-	cmp r1, r0
-	bne _080BA06C
-	ldr r0, =gUnknown_02039B28
-	ldr r1, =gUnknown_02038C2A
-	str r1, [r0]
-	movs r2, 0xF0
-	lsls r2, 3
-	adds r1, r2
-	str r1, [r0, 0x4]
-	ldr r1, =sub_80BA134
-	b _080BA07C
-	.pool
-_080BA06C:
-	ldr r0, =gUnknown_02039B28
-	ldr r1, =gUnknown_02038C2C
-	str r1, [r0]
-	movs r2, 0xF0
-	lsls r2, 3
-	adds r1, r2
-	str r1, [r0, 0x4]
-	ldr r1, =sub_80BA154
-_080BA07C:
-	str r1, [r0, 0x10]
-	adds r1, r0, 0
-	ldr r0, [sp, 0x4]
-	str r0, [r1, 0xC]
-	ldr r0, [sp]
-	str r0, [r1, 0x8]
-	mov r0, sp
-	ldrb r0, [r0, 0x8]
-	strb r0, [r1, 0x15]
-	mov r0, sp
-	ldrb r0, [r0, 0x9]
-	strb r0, [r1, 0x16]
-	strb r0, [r1, 0x17]
-	add sp, 0xC
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_80BA038
-
-	thumb_func_start sub_80BA0A8
-sub_80BA0A8: @ 80BA0A8
-	push {r4,lr}
-	ldr r4, =gUnknown_02039B28
-	ldrb r0, [r4, 0x15]
-	cmp r0, 0
-	beq _080BA122
-	cmp r0, 0x3
-	bne _080BA0EC
-	movs r0, 0
-	strb r0, [r4, 0x15]
-	ldr r1, =0x040000b0
-	ldrh r2, [r1, 0xA]
-	ldr r0, =0x0000c5ff
-	ands r0, r2
-	strh r0, [r1, 0xA]
-	ldrh r2, [r1, 0xA]
-	ldr r0, =0x00007fff
-	ands r0, r2
-	strh r0, [r1, 0xA]
-	ldrh r0, [r1, 0xA]
-	ldr r1, =gUnknown_02039B44
-	movs r0, 0x1
-	strb r0, [r1]
-	b _080BA122
-	.pool
-_080BA0EC:
-	ldr r1, =0x040000b0
-	ldrh r2, [r1, 0xA]
-	ldr r0, =0x0000c5ff
-	ands r0, r2
-	strh r0, [r1, 0xA]
-	ldrh r2, [r1, 0xA]
-	ldr r0, =0x00007fff
-	ands r0, r2
-	strh r0, [r1, 0xA]
-	ldrh r0, [r1, 0xA]
-	ldrb r0, [r4, 0x14]
-	lsls r0, 2
-	adds r0, r4
-	ldr r0, [r0]
-	str r0, [r1]
-	ldr r0, [r4, 0x8]
-	str r0, [r1, 0x4]
-	ldr r0, [r4, 0xC]
-	str r0, [r1, 0x8]
-	ldr r0, [r1, 0x8]
-	ldr r0, [r4, 0x10]
-	bl _call_via_r0
-	ldrb r0, [r4, 0x14]
-	movs r1, 0x1
-	eors r0, r1
-	strb r0, [r4, 0x14]
-_080BA122:
-	pop {r4}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_80BA0A8
-
-	thumb_func_start sub_80BA134
-sub_80BA134: @ 80BA134
-	ldr r0, =gUnknown_02039B28
-	ldr r2, [r0, 0x8]
-	ldrb r1, [r0, 0x14]
-	lsls r0, r1, 4
-	subs r0, r1
-	lsls r0, 7
-	ldr r1, =gUnknown_02038C28
-	adds r0, r1
-	ldrh r0, [r0]
-	strh r0, [r2]
-	bx lr
-	.pool
-	thumb_func_end sub_80BA134
-
-	thumb_func_start sub_80BA154
-sub_80BA154: @ 80BA154
-	ldr r0, =gUnknown_02039B28
-	ldr r2, [r0, 0x8]
-	ldrb r1, [r0, 0x14]
-	lsls r0, r1, 4
-	subs r0, r1
-	lsls r0, 7
-	ldr r1, =gUnknown_02038C28
-	adds r0, r1
-	ldr r0, [r0]
-	str r0, [r2]
-	bx lr
-	.pool
-	thumb_func_end sub_80BA154
-
-	thumb_func_start task00_for_dp12
-task00_for_dp12: @ 80BA174
-	push {r4-r7,lr}
-	mov r7, r10
-	mov r6, r9
-	mov r5, r8
-	push {r5-r7}
-	lsls r0, 24
-	lsrs r0, 24
-	mov r12, r0
-	movs r6, 0
-	ldr r0, =gUnknown_02039B44
-	ldrb r0, [r0]
-	cmp r0, 0
-	beq _080BA1A4
-	mov r0, r12
-	bl DestroyTask
-	ldr r1, =gUnknown_02039B28
-	movs r0, 0xFF
-	strb r0, [r1, 0x18]
-	b _080BA324
-	.pool
-_080BA1A4:
-	ldr r1, =gTasks
-	mov r0, r12
-	lsls r2, r0, 2
-	adds r0, r2, r0
-	lsls r0, 3
-	adds r3, r0, r1
-	movs r4, 0x16
-	ldrsh r0, [r3, r4]
-	mov r10, r1
-	mov r9, r2
-	cmp r0, 0
-	beq _080BA250
-	movs r1, 0x14
-	ldrsh r0, [r3, r1]
-	cmp r0, 0xE
-	bhi _080BA250
-	lsls r0, 2
-	ldr r1, =_080BA1D8
-	adds r0, r1
-	ldr r0, [r0]
-	mov pc, r0
-	.pool
-	.align 2, 0
-_080BA1D8:
-	.4byte _080BA214
-	.4byte _080BA250
-	.4byte _080BA21C
-	.4byte _080BA250
-	.4byte _080BA224
-	.4byte _080BA250
-	.4byte _080BA22C
-	.4byte _080BA250
-	.4byte _080BA234
-	.4byte _080BA250
-	.4byte _080BA23C
-	.4byte _080BA250
-	.4byte _080BA244
-	.4byte _080BA250
-	.4byte _080BA24C
-_080BA214:
-	ldr r0, =gBattle_BG0_X
-	b _080BA24E
-	.pool
-_080BA21C:
-	ldr r0, =gBattle_BG0_Y
-	b _080BA24E
-	.pool
-_080BA224:
-	ldr r0, =gBattle_BG1_X
-	b _080BA24E
-	.pool
-_080BA22C:
-	ldr r0, =gBattle_BG1_Y
-	b _080BA24E
-	.pool
-_080BA234:
-	ldr r0, =gBattle_BG2_X
-	b _080BA24E
-	.pool
-_080BA23C:
-	ldr r0, =gBattle_BG2_Y
-	b _080BA24E
-	.pool
-_080BA244:
-	ldr r0, =gBattle_BG3_X
-	b _080BA24E
-	.pool
-_080BA24C:
-	ldr r0, =gBattle_BG3_Y
-_080BA24E:
-	ldrh r6, [r0]
-_080BA250:
-	mov r0, r9
-	add r0, r12
-	lsls r0, 3
-	mov r2, r10
-	adds r1, r0, r2
-	ldrh r2, [r1, 0x10]
-	movs r3, 0x10
-	ldrsh r0, [r1, r3]
-	cmp r0, 0
-	beq _080BA2BC
-	subs r0, r2, 0x1
-	strh r0, [r1, 0x10]
-	movs r4, 0xE
-	ldrsh r0, [r1, r4]
-	movs r3, 0xA0
-	lsls r3, 1
-	adds r2, r0, r3
-	movs r4, 0x8
-	ldrsh r3, [r1, r4]
-	movs r4, 0xA
-	ldrsh r0, [r1, r4]
-	cmp r3, r0
-	bge _080BA324
-	ldr r5, =gUnknown_02038C28
-	ldr r0, =gUnknown_02039B28
-	mov r8, r0
-	adds r7, r1, 0
-	lsls r0, r2, 1
-	adds r4, r0, r5
-_080BA28A:
-	lsls r2, r3, 1
-	mov r0, r8
-	ldrb r1, [r0, 0x14]
-	lsls r0, r1, 4
-	subs r0, r1
-	lsls r0, 7
-	adds r2, r0
-	adds r2, r5
-	ldrh r0, [r4]
-	adds r0, r6
-	strh r0, [r2]
-	adds r4, 0x2
-	adds r3, 0x1
-	movs r1, 0xA
-	ldrsh r0, [r7, r1]
-	cmp r3, r0
-	blt _080BA28A
-	b _080BA324
-	.pool
-_080BA2BC:
-	ldrh r0, [r1, 0x12]
-	strh r0, [r1, 0x10]
-	movs r2, 0xE
-	ldrsh r0, [r1, r2]
-	movs r3, 0xA0
-	lsls r3, 1
-	adds r2, r0, r3
-	movs r4, 0x8
-	ldrsh r3, [r1, r4]
-	movs r4, 0xA
-	ldrsh r0, [r1, r4]
-	cmp r3, r0
-	bge _080BA304
-	ldr r5, =gUnknown_02038C28
-	adds r7, r1, 0
-	lsls r0, r2, 1
-	adds r4, r0, r5
-	ldr r0, =gUnknown_02039B28
-	mov r8, r0
-_080BA2E2:
-	lsls r2, r3, 1
-	mov r0, r8
-	ldrb r1, [r0, 0x14]
-	lsls r0, r1, 4
-	subs r0, r1
-	lsls r0, 7
-	adds r2, r0
-	adds r2, r5
-	ldrh r0, [r4]
-	adds r0, r6
-	strh r0, [r2]
-	adds r4, 0x2
-	adds r3, 0x1
-	movs r1, 0xA
-	ldrsh r0, [r7, r1]
-	cmp r3, r0
-	blt _080BA2E2
-_080BA304:
-	mov r0, r9
-	add r0, r12
-	lsls r0, 3
-	mov r3, r10
-	adds r2, r0, r3
-	ldrh r0, [r2, 0xE]
-	adds r0, 0x1
-	strh r0, [r2, 0xE]
-	lsls r0, 16
-	asrs r0, 16
-	movs r4, 0xC
-	ldrsh r1, [r2, r4]
-	cmp r0, r1
-	bne _080BA324
-	movs r0, 0
-	strh r0, [r2, 0xE]
-_080BA324:
-	pop {r3-r5}
-	mov r8, r3
-	mov r9, r4
-	mov r10, r5
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end task00_for_dp12
-
-	thumb_func_start sub_80BA33C
-sub_80BA33C: @ 80BA33C
-	push {r4-r7,lr}
-	adds r6, r0, 0
-	lsls r1, 24
-	lsrs r5, r1, 24
-	lsls r2, 24
-	lsrs r4, r2, 24
-	movs r1, 0
-	movs r2, 0
-	ldr r0, =gSineTable
-	mov r12, r0
-_080BA350:
-	lsls r0, r1, 1
-	adds r3, r0, r6
-	lsls r0, r2, 1
-	add r0, r12
-	movs r7, 0
-	ldrsh r0, [r0, r7]
-	muls r0, r4
-	cmp r0, 0
-	bge _080BA364
-	adds r0, 0xFF
-_080BA364:
-	asrs r0, 8
-	strh r0, [r3]
-	adds r0, r2, r5
-	lsls r0, 24
-	lsrs r2, r0, 24
-	adds r0, r1, 0x1
-	lsls r0, 16
-	lsrs r1, r0, 16
-	cmp r1, 0xFF
-	bls _080BA350
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_80BA33C
-
-	thumb_func_start sub_80BA384
-sub_80BA384: @ 80BA384
-	push {r4-r7,lr}
-	mov r7, r10
-	mov r6, r9
-	mov r5, r8
-	push {r5-r7}
-	sub sp, 0x20
-	adds r5, r0, 0
-	str r1, [sp, 0x10]
-	ldr r0, [sp, 0x40]
-	mov r8, r0
-	ldr r1, [sp, 0x44]
-	mov r9, r1
-	ldr r0, [sp, 0x48]
-	mov r10, r0
-	lsls r5, 24
-	lsrs r5, 24
-	ldr r1, [sp, 0x10]
-	lsls r1, 24
-	str r1, [sp, 0x14]
-	lsrs r0, r1, 24
-	str r0, [sp, 0xC]
-	lsls r1, r2, 24
-	lsrs r1, 24
-	str r1, [sp, 0x18]
-	lsls r2, r3, 24
-	lsrs r2, 24
-	str r2, [sp, 0x1C]
-	mov r1, r8
-	lsls r1, 24
-	lsrs r1, 24
-	mov r8, r1
-	mov r3, r9
-	lsls r3, 24
-	lsrs r3, 24
-	mov r9, r3
-	mov r0, r10
-	lsls r0, 24
-	lsrs r0, 24
-	mov r10, r0
-	bl dp12_8087EA4
-	ldr r0, =0x04000010
-	add r0, r9
-	str r0, [sp]
-	ldr r0, =0xa2600001
-	str r0, [sp, 0x4]
-	mov r1, sp
-	movs r0, 0x1
-	strb r0, [r1, 0x8]
-	mov r0, sp
-	movs r1, 0
-	strb r1, [r0, 0x9]
-	ldr r0, [sp]
-	ldr r1, [sp, 0x4]
-	ldr r2, [sp, 0x8]
-	bl sub_80BA038
-	ldr r0, =task00_for_dp12
-	movs r1, 0
-	bl CreateTask
-	lsls r0, 24
-	lsrs r7, r0, 24
-	ldr r0, =gTasks
-	lsls r4, r7, 2
-	adds r4, r7
-	lsls r4, 3
-	adds r4, r0
-	strh r5, [r4, 0x8]
-	mov r3, sp
-	ldrh r3, [r3, 0xC]
-	strh r3, [r4, 0xA]
-	movs r0, 0x80
-	lsls r0, 1
-	ldr r1, [sp, 0x18]
-	bl __divsi3
-	strh r0, [r4, 0xC]
-	movs r0, 0
-	strh r0, [r4, 0xE]
-	mov r1, r8
-	strh r1, [r4, 0x10]
-	strh r1, [r4, 0x12]
-	mov r3, r9
-	strh r3, [r4, 0x14]
-	mov r0, r10
-	strh r0, [r4, 0x16]
-	ldr r0, =gUnknown_02039B28
-	strb r7, [r0, 0x18]
-	ldr r0, =gUnknown_02039B44
-	movs r1, 0
-	strb r1, [r0]
-	ldr r4, =gUnknown_02038EA8
-	ldr r3, [sp, 0xC]
-	subs r6, r3, r5
-	lsls r3, r6, 24
-	lsrs r3, 24
-	adds r0, r4, 0
-	ldr r1, [sp, 0x18]
-	ldr r2, [sp, 0x1C]
-	bl sub_80BA33C
-	ldr r0, [sp, 0xC]
-	cmp r5, r0
-	bge _080BA47E
-	ldr r1, =0xfffffd80
-	adds r2, r4, r1
-	lsls r1, r5, 1
-	movs r3, 0xF0
-	lsls r3, 3
-	adds r0, r1, r3
-	adds r3, r0, r2
-	adds r1, r2
-	adds r2, r4, 0
-	adds r5, r6, 0
-_080BA46A:
-	ldrh r0, [r2]
-	strh r0, [r1]
-	ldrh r0, [r2]
-	strh r0, [r3]
-	adds r2, 0x2
-	adds r3, 0x2
-	adds r1, 0x2
-	subs r5, 0x1
-	cmp r5, 0
-	bne _080BA46A
-_080BA47E:
-	adds r0, r7, 0
-	add sp, 0x20
-	pop {r3-r5}
-	mov r8, r3
-	mov r9, r4
-	mov r10, r5
-	pop {r4-r7}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end sub_80BA384
-
-	.align 2, 0 @ Don't pad with nop.
diff --git a/asm/use_pokeblock.s b/asm/use_pokeblock.s
index 60c11524a..5047ec65e 100644
--- a/asm/use_pokeblock.s
+++ b/asm/use_pokeblock.s
@@ -732,10 +732,10 @@ _08166C28:
 	b _08166D18
 	.pool
 _08166C40:
-	ldr r1, =gUnknown_02039B28
+	ldr r1, =gScanlineEffect
 	movs r0, 0x3
 	strb r0, [r1, 0x15]
-	bl sub_80BA0A8
+	bl ScanlineEffect_InitHBlankDmaTransfer
 _08166C4A:
 	ldr r1, [r4]
 	adds r1, 0x50
diff --git a/include/scanline_effect.h b/include/scanline_effect.h
new file mode 100644
index 000000000..54dfe17bd
--- /dev/null
+++ b/include/scanline_effect.h
@@ -0,0 +1,47 @@
+#ifndef GUARD_SCANLINE_EFFECT_H
+#define GUARD_SCANLINE_EFFECT_H
+
+// DMA control value to ransfer a single 16-bit value at HBlank
+#define SCANLINE_EFFECT_DMACNT_16BIT (((DMA_ENABLE | DMA_START_HBLANK | DMA_REPEAT | DMA_SRC_INC | DMA_DEST_INC | DMA_16BIT | DMA_DEST_RELOAD) << 16) | 1)
+
+#define SCANLINE_EFFECT_REG_BG0HOFS (REG_ADDR_BG0HOFS - REG_ADDR_BG0HOFS)
+#define SCANLINE_EFFECT_REG_BG0VOFS (REG_ADDR_BG0VOFS - REG_ADDR_BG0HOFS)
+#define SCANLINE_EFFECT_REG_BG1HOFS (REG_ADDR_BG1HOFS - REG_ADDR_BG0HOFS)
+#define SCANLINE_EFFECT_REG_BG1VOFS (REG_ADDR_BG1VOFS - REG_ADDR_BG0HOFS)
+#define SCANLINE_EFFECT_REG_BG2HOFS (REG_ADDR_BG2HOFS - REG_ADDR_BG0HOFS)
+#define SCANLINE_EFFECT_REG_BG2VOFS (REG_ADDR_BG2VOFS - REG_ADDR_BG0HOFS)
+#define SCANLINE_EFFECT_REG_BG3HOFS (REG_ADDR_BG3HOFS - REG_ADDR_BG0HOFS)
+#define SCANLINE_EFFECT_REG_BG3VOFS (REG_ADDR_BG3VOFS - REG_ADDR_BG0HOFS)
+
+struct ScanlineEffectParams
+{
+    volatile void *dmaDest;
+    u32 dmaControl;
+    u8 initState;
+    u8 unused9;
+};
+
+struct ScanlineEffect
+{
+    void *dmaSrcBuffers[2];
+    volatile void *dmaDest;
+    u32 dmaControl;
+    void (*setFirstScanlineReg)(void);
+    u8 srcBuffer;
+    u8 state;
+    u8 unused16;
+    u8 unused17;
+    u8 waveTaskId;
+};
+
+extern struct ScanlineEffect gScanlineEffect;
+
+extern u16 gScanlineEffectRegBuffers[][0x3C0];
+
+void ScanlineEffect_Stop(void);
+void ScanlineEffect_Clear(void);
+void ScanlineEffect_SetParams(struct ScanlineEffectParams);
+void ScanlineEffect_InitHBlankDmaTransfer(void);
+u8 ScanlineEffect_InitWave(u8 startLine, u8 endLine, u8 frequency, u8 amplitude, u8 delayInterval, u8 regOffset, bool8 a7);
+
+#endif // GUARD_SCANLINE_EFFECT_H
diff --git a/include/unknown_task.h b/include/unknown_task.h
deleted file mode 100644
index 906fed3e0..000000000
--- a/include/unknown_task.h
+++ /dev/null
@@ -1,22 +0,0 @@
-#ifndef GUARD_unknown_task_H
-#define GUARD_unknown_task_H
-
-// Exported type declarations
-struct UnknownTaskStruct
-{
-    volatile void *dest;
-    u32 control;
-    u8 unk8;
-    u8 unk9;
-};
-
-extern struct UnknownTaskStruct gUnknown_0831AC70;
-
-// Exported RAM declarations
-
-// Exported ROM declarations
-void ScanlineEffect_Stop(void);
-void sub_80BA038(struct UnknownTaskStruct arg0);
-void sub_80BA0A8(void);
-
-#endif // GUARD_unknown_task_H
diff --git a/ld_script.txt b/ld_script.txt
index c275fddce..c16575379 100644
--- a/ld_script.txt
+++ b/ld_script.txt
@@ -126,7 +126,7 @@ SECTIONS {
         src/trainer_see.o(.text);
         src/wild_encounter.o(.text);
         asm/field_effect.o(.text);
-        asm/unknown_task.o(.text);
+        src/scanline_effect.o(.text);
         src/option_menu.o(.text);
         src/pokedex.o(.text);
         asm/pokedex.o(.text);
diff --git a/src/battle_2.c b/src/battle_2.c
index 61e39b39f..4ff2bd19a 100644
--- a/src/battle_2.c
+++ b/src/battle_2.c
@@ -4,7 +4,7 @@
 #include "main.h"
 #include "load_save.h"
 #include "gpu_regs.h"
-#include "unknown_task.h"
+#include "scanline_effect.h"
 #include "battle_setup.h"
 #include "battle_scripts.h"
 #include "pokemon.h"
@@ -46,13 +46,6 @@
 #include "battle_string_ids.h"
 #include "data2.h"
 
-struct UnknownStruct6
-{
-    u16 unk0[0xA0];
-    u8 fillerA0[0x640];
-    u16 unk780[0xA0];
-};
-
 struct UnknownPokemonStruct2
 {
     /*0x00*/ u16 species;
@@ -90,8 +83,6 @@ extern void (*gBattleMainFunc)(void);
 extern void (*gCB2_AfterEvolution)(void);
 extern struct UnknownPokemonStruct2 gUnknown_02022FF8[3]; // what is it used for?
 extern struct UnknownPokemonStruct2* gUnknown_02023058; // what is it used for?
-extern u8 gUnknown_02039B28[]; // possibly a struct?
-extern struct UnknownStruct6 gUnknown_02038C28; // todo: identify & document
 extern struct MusicPlayerInfo gMPlayInfo_SE1;
 extern struct MusicPlayerInfo gMPlayInfo_SE2;
 extern u8 gDecompressionBuffer[];
@@ -162,6 +153,7 @@ extern const u8 * const gBattlescriptsForBallThrow[];
 extern const u8 * const gBattlescriptsForRunningByItem[];
 extern const u8 * const gBattlescriptsForUsingItem[];
 extern const u8 * const gBattlescriptsForSafariActions[];
+extern const struct ScanlineEffectParams gUnknown_0831AC70;
 
 // strings
 extern const u8 gText_LinkStandby3[];
@@ -180,7 +172,7 @@ extern const u8 gText_Confusion[];
 extern const u8 gText_Love[];
 
 // functions
-extern void dp12_8087EA4(void);
+extern void ScanlineEffect_Clear(void);
 extern void sub_80356D0(void);
 extern void GetFrontierTrainerName(u8* dst, u16 trainerId); // battle tower
 extern void sub_8166188(void); // battle tower, sets link battle mons level but why?
@@ -383,24 +375,21 @@ static void CB2_InitBattleInternal(void)
     else
     {
         gBattle_WIN0V = 0x5051;
-        dp12_8087EA4();
+        ScanlineEffect_Clear();
 
         for (i = 0; i < 80; i++)
         {
-            gUnknown_02038C28.unk0[i] = 0xF0;
-            gUnknown_02038C28.unk780[i] = 0xF0;
+            gScanlineEffectRegBuffers[0][i] = 0xF0;
+            gScanlineEffectRegBuffers[1][i] = 0xF0;
         }
         for (i = 80; i < 160; i++)
         {
-            #ifndef NONMATCHING
-                asm(""::"r"(i)); // needed to match
-            #endif // NONMATCHING
-
-            gUnknown_02038C28.unk0[i] = 0xFF10;
-            gUnknown_02038C28.unk780[i] = 0xFF10;
+            asm(""::"r"(i));
+            gScanlineEffectRegBuffers[0][i] = 0xFF10;
+            gScanlineEffectRegBuffers[1][i] = 0xFF10;
         }
 
-        sub_80BA038(gUnknown_0831AC70);
+        ScanlineEffect_SetParams(gUnknown_0831AC70);
     }
 
     ResetPaletteFade();
@@ -1596,7 +1585,7 @@ void BattleMainCB2(void)
 static void FreeRestoreBattleData(void)
 {
     gMain.callback1 = gPreBattleCallback1;
-    gUnknown_02039B28[0x15] = 3;
+    gScanlineEffect.state = 3;
     gMain.inBattle = 0;
     ZeroEnemyPartyMons();
     m4aSongNumStop(0x5A);
@@ -1814,7 +1803,7 @@ void VBlankCB_Battle(void)
     LoadOam();
     ProcessSpriteCopyRequests();
     TransferPlttBuffer();
-    sub_80BA0A8();
+    ScanlineEffect_InitHBlankDmaTransfer();
 }
 
 void nullsub_17(void)
@@ -1952,18 +1941,18 @@ void sub_8038D64(void)
         SetGpuReg(REG_OFFSET_WINOUT, 0);
         gBattle_WIN0H = 0xF0;
         gBattle_WIN0V = 0x5051;
-        dp12_8087EA4();
+        ScanlineEffect_Clear();
 
         for (i = 0; i < 80; i++)
         {
-            gUnknown_02038C28.unk0[i] = 0xF0;
-            gUnknown_02038C28.unk780[i] = 0xF0;
+            gScanlineEffectRegBuffers[0][i] = 0xF0;
+            gScanlineEffectRegBuffers[1][i] = 0xF0;
         }
         for (i = 80; i < 160; i++)
         {
             asm(""::"r"(i));  // Needed to stop the compiler from optimizing out the loop counter
-            gUnknown_02038C28.unk0[i] = 0xFF10;
-            gUnknown_02038C28.unk780[i] = 0xFF10;
+            gScanlineEffectRegBuffers[0][i] = 0xFF10;
+            gScanlineEffectRegBuffers[1][i] = 0xFF10;
         }
 
         ResetPaletteFade();
diff --git a/src/battle_transition.c b/src/battle_transition.c
index e003e0fce..0ff8cd903 100644
--- a/src/battle_transition.c
+++ b/src/battle_transition.c
@@ -14,7 +14,7 @@
 #include "constants/songs.h"
 #include "constants/trainers.h"
 #include "field_camera.h"
-#include "unknown_task.h"
+#include "scanline_effect.h"
 #include "malloc.h"
 #include "gpu_regs.h"
 #include "decompress.h"
@@ -56,8 +56,6 @@ struct StructRectangularSpiral
 typedef bool8 (*TransitionStateFunc)(struct Task *task);
 typedef bool8 (*TransitionSpriteCallback)(struct Sprite *sprite);
 
-extern u16 gUnknown_020393A8[];
-extern u16 gUnknown_02038C28[][0x3C0];
 extern u16 gBattle_BG0_X;
 extern u16 gBattle_BG0_Y;
 
@@ -65,7 +63,7 @@ extern const struct OamData gFieldObjectBaseOam_32x32;
 
 extern void c2_exit_to_overworld_2_switch(void);
 extern void sub_80AC3D0(void);
-extern void dp12_8087EA4(void);
+extern void ScanlineEffect_Clear(void);
 
 // this file's functions
 static void LaunchBattleTransitionTask(u8 transitionId);
@@ -1110,9 +1108,9 @@ static void Phase2Task_Swirl(u8 taskId)
 static bool8 Phase2_Swirl_Func1(struct Task *task)
 {
     sub_8149F08();
-    dp12_8087EA4();
+    ScanlineEffect_Clear();
     BeginNormalPaletteFade(-1, 4, 0, 0x10, 0);
-    sub_8149F98(gUnknown_020393A8, sTransitionStructPtr->field_14, 0, 2, 0, 160);
+    sub_8149F98(gScanlineEffectRegBuffers[1], sTransitionStructPtr->field_14, 0, 2, 0, 160);
 
     SetVBlankCallback(VBlankCB_Phase2_Swirl);
     SetHBlankCallback(HBlankCB_Phase2_Swirl);
@@ -1129,7 +1127,7 @@ static bool8 Phase2_Swirl_Func2(struct Task *task)
     task->tData1 += 4;
     task->tData2 += 8;
 
-    sub_8149F98(gUnknown_02038C28[0], sTransitionStructPtr->field_14, task->tData1, 2, task->tData2, 160);
+    sub_8149F98(gScanlineEffectRegBuffers[0], sTransitionStructPtr->field_14, task->tData1, 2, task->tData2, 160);
 
     if (!gPaletteFade.active)
     {
@@ -1145,12 +1143,12 @@ static void VBlankCB_Phase2_Swirl(void)
 {
     VBlankCB_BattleTransition();
     if (sTransitionStructPtr->VBlank_DMA)
-        DmaCopy16(3, gUnknown_02038C28[0], gUnknown_02038C28[1], 320);
+        DmaCopy16(3, gScanlineEffectRegBuffers[0], gScanlineEffectRegBuffers[1], 320);
 }
 
 static void HBlankCB_Phase2_Swirl(void)
 {
-    u16 var = gUnknown_02038C28[1][REG_VCOUNT];
+    u16 var = gScanlineEffectRegBuffers[1][REG_VCOUNT];
     REG_BG1HOFS = var;
     REG_BG2HOFS = var;
     REG_BG3HOFS = var;
@@ -1164,10 +1162,10 @@ static void Phase2Task_Shuffle(u8 taskId)
 static bool8 Phase2_Shuffle_Func1(struct Task *task)
 {
     sub_8149F08();
-    dp12_8087EA4();
+    ScanlineEffect_Clear();
 
     BeginNormalPaletteFade(-1, 4, 0, 0x10, 0);
-    memset(gUnknown_020393A8, sTransitionStructPtr->field_16, 0x140);
+    memset(gScanlineEffectRegBuffers[1], sTransitionStructPtr->field_16, 0x140);
 
     SetVBlankCallback(VBlankCB_Phase2_Shuffle);
     SetHBlankCallback(HBlankCB_Phase2_Shuffle);
@@ -1192,7 +1190,7 @@ static bool8 Phase2_Shuffle_Func2(struct Task *task)
     for (i = 0; i < 160; i++, r4 += 4224)
     {
         u16 var = r4 / 256;
-        gUnknown_02038C28[0][i] = sTransitionStructPtr->field_16 + Sin(var, r3);
+        gScanlineEffectRegBuffers[0][i] = sTransitionStructPtr->field_16 + Sin(var, r3);
     }
 
     if (!gPaletteFade.active)
@@ -1206,12 +1204,12 @@ static void VBlankCB_Phase2_Shuffle(void)
 {
     VBlankCB_BattleTransition();
     if (sTransitionStructPtr->VBlank_DMA)
-        DmaCopy16(3, gUnknown_02038C28[0], gUnknown_02038C28[1], 320);
+        DmaCopy16(3, gScanlineEffectRegBuffers[0], gScanlineEffectRegBuffers[1], 320);
 }
 
 static void HBlankCB_Phase2_Shuffle(void)
 {
-    u16 var = gUnknown_02038C28[1][REG_VCOUNT];
+    u16 var = gScanlineEffectRegBuffers[1][REG_VCOUNT];
     REG_BG1VOFS = var;
     REG_BG2VOFS = var;
     REG_BG3VOFS = var;
@@ -1257,7 +1255,7 @@ static void sub_814669C(struct Task *task)
     s32 i;
 
     sub_8149F08();
-    dp12_8087EA4();
+    ScanlineEffect_Clear();
 
     task->tData1 = 16;
     task->tData2 = 0;
@@ -1272,7 +1270,7 @@ static void sub_814669C(struct Task *task)
 
     for (i = 0; i < 160; i++)
     {
-        gUnknown_02038C28[1][i] = 240;
+        gScanlineEffectRegBuffers[1][i] = 240;
     }
 
     SetVBlankCallback(VBlankCB0_Phase2_BigPokeball);
@@ -1351,7 +1349,7 @@ static bool8 Phase2_BigPokeball_Func2(struct Task *task)
             dst1[i * 32 + j] = *BigPokeballMap | 0xF000;
         }
     }
-    sub_8149F98(gUnknown_02038C28[0], 0, task->tData4, 132, task->tData5, 160);
+    sub_8149F98(gScanlineEffectRegBuffers[0], 0, task->tData4, 132, task->tData5, 160);
 
     task->tState++;
     return TRUE;
@@ -1363,7 +1361,7 @@ static bool8 Phase2_Aqua_Func2(struct Task *task)
 
     sub_8149F58(&dst1, &dst2);
     LZ77UnCompVram(sTeamAqua_Tilemap, dst1);
-    sub_8149F98(gUnknown_02038C28[0], 0, task->tData4, 132, task->tData5, 160);
+    sub_8149F98(gScanlineEffectRegBuffers[0], 0, task->tData4, 132, task->tData5, 160);
 
     task->tState++;
     return FALSE;
@@ -1375,7 +1373,7 @@ static bool8 Phase2_Magma_Func2(struct Task *task)
 
     sub_8149F58(&dst1, &dst2);
     LZ77UnCompVram(sTeamMagma_Tilemap, dst1);
-    sub_8149F98(gUnknown_02038C28[0], 0, task->tData4, 132, task->tData5, 160);
+    sub_8149F98(gScanlineEffectRegBuffers[0], 0, task->tData4, 132, task->tData5, 160);
 
     task->tState++;
     return FALSE;
@@ -1388,7 +1386,7 @@ static bool8 Phase2_Regice_Func2(struct Task *task)
     sub_8149F58(&dst1, &dst2);
     LoadPalette(gUnknown_085BC2B4, 0xF0, 0x20);
     CpuCopy16(gUnknown_085BC314, dst1, 0x500);
-    sub_8149F98(gUnknown_02038C28[0], 0, task->tData4, 132, task->tData5, 160);
+    sub_8149F98(gScanlineEffectRegBuffers[0], 0, task->tData4, 132, task->tData5, 160);
 
     task->tState++;
     return FALSE;
@@ -1401,7 +1399,7 @@ static bool8 Phase2_Registeel_Func2(struct Task *task)
     sub_8149F58(&dst1, &dst2);
     LoadPalette(gUnknown_085BC2D4, 0xF0, 0x20);
     CpuCopy16(gUnknown_085BCB14, dst1, 0x500);
-    sub_8149F98(gUnknown_02038C28[0], 0, task->tData4, 132, task->tData5, 160);
+    sub_8149F98(gScanlineEffectRegBuffers[0], 0, task->tData4, 132, task->tData5, 160);
 
     task->tState++;
     return FALSE;
@@ -1414,7 +1412,7 @@ static bool8 Phase2_Regirock_Func2(struct Task *task)
     sub_8149F58(&dst1, &dst2);
     LoadPalette(gUnknown_085BC2F4, 0xF0, 0x20);
     CpuCopy16(gUnknown_085BD314, dst1, 0x500);
-    sub_8149F98(gUnknown_02038C28[0], 0, task->tData4, 132, task->tData5, 160);
+    sub_8149F98(gScanlineEffectRegBuffers[0], 0, task->tData4, 132, task->tData5, 160);
 
     task->tState++;
     return FALSE;
@@ -1499,7 +1497,7 @@ static bool8 Phase2_BigPokeball_Func3(struct Task *task)
     task->tData4 += 8;
     task->tData5 -= 256;
 
-    sub_8149F98(gUnknown_02038C28[0], 0, task->tData4, 132, task->tData5 >> 8, 160);
+    sub_8149F98(gScanlineEffectRegBuffers[0], 0, task->tData4, 132, task->tData5 >> 8, 160);
 
     sTransitionStructPtr->VBlank_DMA++;
     return FALSE;
@@ -1519,7 +1517,7 @@ static bool8 Phase2_BigPokeball_Func4(struct Task *task)
     task->tData4 += 8;
     task->tData5 -= 256;
 
-    sub_8149F98(gUnknown_02038C28[0], 0, task->tData4, 132, task->tData5 >> 8, 160);
+    sub_8149F98(gScanlineEffectRegBuffers[0], 0, task->tData4, 132, task->tData5 >> 8, 160);
 
     sTransitionStructPtr->VBlank_DMA++;
     return FALSE;
@@ -1531,7 +1529,7 @@ static bool8 Phase2_BigPokeball_Func5(struct Task *task)
     task->tData4 += 8;
     task->tData5 -= 256;
 
-    sub_8149F98(gUnknown_02038C28[0], 0, task->tData4, 132, task->tData5 >> 8, 160);
+    sub_8149F98(gScanlineEffectRegBuffers[0], 0, task->tData4, 132, task->tData5 >> 8, 160);
 
     if (task->tData5 <= 0)
     {
@@ -1577,7 +1575,7 @@ static bool8 Phase2_BigPokeball_Func6(struct Task *task)
         if (task->tData1 < 0)
             task->tData1 = 0;
     }
-    sub_814A014(gUnknown_02038C28[0], 120, 80, task->tData1);
+    sub_814A014(gScanlineEffectRegBuffers[0], 120, 80, task->tData1);
     if (task->tData1 == 0)
     {
         SetVBlankCallback(NULL);
@@ -1604,7 +1602,7 @@ static void Transition_BigPokeball_Vblank(void)
     DmaStop(0);
     VBlankCB_BattleTransition();
     if (sTransitionStructPtr->VBlank_DMA)
-        DmaCopy16(3, gUnknown_02038C28[0], gUnknown_02038C28[1], 320);
+        DmaCopy16(3, gScanlineEffectRegBuffers[0], gScanlineEffectRegBuffers[1], 320);
     REG_WININ = sTransitionStructPtr->WININ;
     REG_WINOUT = sTransitionStructPtr->WINOUT;
     REG_WIN0V = sTransitionStructPtr->WIN0V;
@@ -1615,13 +1613,13 @@ static void Transition_BigPokeball_Vblank(void)
 static void VBlankCB0_Phase2_BigPokeball(void)
 {
     Transition_BigPokeball_Vblank();
-    DmaSet(0, gUnknown_020393A8, &REG_BG0HOFS, 0xA2400001);
+    DmaSet(0, gScanlineEffectRegBuffers[1], &REG_BG0HOFS, 0xA2400001);
 }
 
 static void VBlankCB1_Phase2_BigPokeball(void)
 {
     Transition_BigPokeball_Vblank();
-    DmaSet(0, gUnknown_020393A8, &REG_WIN0H, 0xA2400001);
+    DmaSet(0, gScanlineEffectRegBuffers[1], &REG_WIN0H, 0xA2400001);
 }
 
 static void Phase2Task_PokeballsTrail(u8 taskId)
@@ -1741,7 +1739,7 @@ static bool8 Phase2_Clockwise_BlackFade_Func1(struct Task *task)
     u16 i;
 
     sub_8149F08();
-    dp12_8087EA4();
+    ScanlineEffect_Clear();
 
     sTransitionStructPtr->WININ = 0;
     sTransitionStructPtr->WINOUT = 63;
@@ -1750,7 +1748,7 @@ static bool8 Phase2_Clockwise_BlackFade_Func1(struct Task *task)
 
     for (i = 0; i < 160; i++)
     {
-        gUnknown_020393A8[i] = 0xF3F4;
+        gScanlineEffectRegBuffers[1][i] = 0xF3F4;
     }
 
     SetVBlankCallback(VBlankCB_Phase2_Clockwise_BlackFade);
@@ -1767,7 +1765,7 @@ static bool8 Phase2_Clockwise_BlackFade_Func2(struct Task *task)
     sub_814A1AC(sTransitionStructPtr->data, 120, 80, sTransitionStructPtr->data[4], -1, 1, 1);
     do
     {
-        gUnknown_02038C28[0][sTransitionStructPtr->data[3]] = (sTransitionStructPtr->data[2] + 1) | 0x7800;
+        gScanlineEffectRegBuffers[0][sTransitionStructPtr->data[3]] = (sTransitionStructPtr->data[2] + 1) | 0x7800;
     } while (!sub_814A228(sTransitionStructPtr->data, 1, 1));
 
     sTransitionStructPtr->data[4] += 16;
@@ -1795,7 +1793,7 @@ static bool8 Phase2_Clockwise_BlackFade_Func3(struct Task *task)
         r1 = 120, r3 = sTransitionStructPtr->data[2] + 1;
         if (sTransitionStructPtr->data[5] >= 80)
             r1 = sTransitionStructPtr->data[2], r3 = 240;
-        gUnknown_02038C28[0][sTransitionStructPtr->data[3]] = (r3) | (r1 << 8);
+        gScanlineEffectRegBuffers[0][sTransitionStructPtr->data[3]] = (r3) | (r1 << 8);
         if (var != 0)
             break;
         var = sub_814A228(sTransitionStructPtr->data, 1, 1);
@@ -1811,7 +1809,7 @@ static bool8 Phase2_Clockwise_BlackFade_Func3(struct Task *task)
     {
         while (sTransitionStructPtr->data[3] < sTransitionStructPtr->data[5])
         {
-            gUnknown_02038C28[0][++sTransitionStructPtr->data[3]] = (r3) | (r1 << 8);
+            gScanlineEffectRegBuffers[0][++sTransitionStructPtr->data[3]] = (r3) | (r1 << 8);
         }
     }
 
@@ -1826,7 +1824,7 @@ static bool8 Phase2_Clockwise_BlackFade_Func4(struct Task *task)
     sub_814A1AC(sTransitionStructPtr->data, 120, 80, sTransitionStructPtr->data[4], 160, 1, 1);
     do
     {
-        gUnknown_02038C28[0][sTransitionStructPtr->data[3]] = (sTransitionStructPtr->data[2] << 8) | 0xF0;
+        gScanlineEffectRegBuffers[0][sTransitionStructPtr->data[3]] = (sTransitionStructPtr->data[2] << 8) | 0xF0;
     } while (!sub_814A228(sTransitionStructPtr->data, 1, 1));
 
     sTransitionStructPtr->data[4] -= 16;
@@ -1851,12 +1849,12 @@ static bool8 Phase2_Clockwise_BlackFade_Func5(struct Task *task)
 
     while (1)
     {
-        r1 = (gUnknown_02038C28[0][sTransitionStructPtr->data[3]]) & 0xFF;
+        r1 = (gScanlineEffectRegBuffers[0][sTransitionStructPtr->data[3]]) & 0xFF;
         r2 = sTransitionStructPtr->data[2];
         if (sTransitionStructPtr->data[5] <= 80)
             r2 = 120, r1 = sTransitionStructPtr->data[2];
         var4 = (r1) | (r2 << 8);
-        gUnknown_02038C28[0][sTransitionStructPtr->data[3]] = var4;
+        gScanlineEffectRegBuffers[0][sTransitionStructPtr->data[3]] = var4;
         if (var != 0)
             break;
         var = sub_814A228(sTransitionStructPtr->data, 1, 1);
@@ -1872,7 +1870,7 @@ static bool8 Phase2_Clockwise_BlackFade_Func5(struct Task *task)
     {
         while (sTransitionStructPtr->data[3] > sTransitionStructPtr->data[5])
         {
-            gUnknown_02038C28[0][--sTransitionStructPtr->data[3]] = (r1) | (r2 << 8);
+            gScanlineEffectRegBuffers[0][--sTransitionStructPtr->data[3]] = (r1) | (r2 << 8);
         }
     }
 
@@ -1892,7 +1890,7 @@ static bool8 Phase2_Clockwise_BlackFade_Func6(struct Task *task)
         r2 = 120, r3 = sTransitionStructPtr->data[2];
         if (sTransitionStructPtr->data[2] >= 120)
             r2 = 0, r3 = 240;
-        gUnknown_02038C28[0][sTransitionStructPtr->data[3]] = (r3) | (r2 << 8);
+        gScanlineEffectRegBuffers[0][sTransitionStructPtr->data[3]] = (r3) | (r2 << 8);
 
     } while (!sub_814A228(sTransitionStructPtr->data, 1, 1));
 
@@ -1917,12 +1915,12 @@ static void VBlankCB_Phase2_Clockwise_BlackFade(void)
     DmaStop(0);
     VBlankCB_BattleTransition();
     if (sTransitionStructPtr->VBlank_DMA != 0)
-        DmaCopy16(3, gUnknown_02038C28[0], gUnknown_02038C28[1], 320);
+        DmaCopy16(3, gScanlineEffectRegBuffers[0], gScanlineEffectRegBuffers[1], 320);
     REG_WININ = sTransitionStructPtr->WININ;
     REG_WINOUT = sTransitionStructPtr->WINOUT;
     REG_WIN0V = sTransitionStructPtr->WIN0V;
-    REG_WIN0H = gUnknown_02038C28[1][0];
-    DmaSet(0, gUnknown_02038C28[1], &REG_WIN0H, 0xA2400001);
+    REG_WIN0H = gScanlineEffectRegBuffers[1][0];
+    DmaSet(0, gScanlineEffectRegBuffers[1], &REG_WIN0H, 0xA2400001);
 }
 
 static void Phase2Task_Ripple(u8 taskId)
@@ -1935,11 +1933,11 @@ static bool8 Phase2_Ripple_Func1(struct Task *task)
     u8 i;
 
     sub_8149F08();
-    dp12_8087EA4();
+    ScanlineEffect_Clear();
 
     for (i = 0; i < 160; i++)
     {
-        gUnknown_020393A8[i] = sTransitionStructPtr->field_16;
+        gScanlineEffectRegBuffers[1][i] = sTransitionStructPtr->field_16;
     }
 
     SetVBlankCallback(VBlankCB_Phase2_Ripple);
@@ -1971,7 +1969,7 @@ static bool8 Phase2_Ripple_Func2(struct Task *task)
         // todo: fix the asm
         s16 var = r4 >> 8;
         asm("");
-        gUnknown_02038C28[0][i] = sTransitionStructPtr->field_16 + Sin(var, r3);
+        gScanlineEffectRegBuffers[0][i] = sTransitionStructPtr->field_16 + Sin(var, r3);
     }
 
     if (++task->tData3 == 81)
@@ -1991,12 +1989,12 @@ static void VBlankCB_Phase2_Ripple(void)
 {
     VBlankCB_BattleTransition();
     if (sTransitionStructPtr->VBlank_DMA)
-        DmaCopy16(3, gUnknown_02038C28[0], gUnknown_02038C28[1], 320);
+        DmaCopy16(3, gScanlineEffectRegBuffers[0], gScanlineEffectRegBuffers[1], 320);
 }
 
 static void HBlankCB_Phase2_Ripple(void)
 {
-    u16 var = gUnknown_02038C28[1][REG_VCOUNT];
+    u16 var = gScanlineEffectRegBuffers[1][REG_VCOUNT];
     REG_BG1VOFS = var;
     REG_BG2VOFS = var;
     REG_BG3VOFS = var;
@@ -2012,7 +2010,7 @@ static bool8 Phase2_Wave_Func1(struct Task *task)
     u8 i;
 
     sub_8149F08();
-    dp12_8087EA4();
+    ScanlineEffect_Clear();
 
     sTransitionStructPtr->WININ = 63;
     sTransitionStructPtr->WINOUT = 0;
@@ -2021,7 +2019,7 @@ static bool8 Phase2_Wave_Func1(struct Task *task)
 
     for (i = 0; i < 160; i++)
     {
-        gUnknown_02038C28[1][i] = 242;
+        gScanlineEffectRegBuffers[1][i] = 242;
     }
 
     SetVBlankCallback(VBlankCB_Phase2_Wave);
@@ -2037,7 +2035,7 @@ static bool8 Phase2_Wave_Func2(struct Task *task)
     bool8 nextFunc;
 
     sTransitionStructPtr->VBlank_DMA = FALSE;
-    toStore = gUnknown_02038C28[0];
+    toStore = gScanlineEffectRegBuffers[0];
     r5 = task->tData2;
     task->tData2 += 16;
     task->tData1 += 8;
@@ -2073,11 +2071,11 @@ static void VBlankCB_Phase2_Wave(void)
     DmaStop(0);
     VBlankCB_BattleTransition();
     if (sTransitionStructPtr->VBlank_DMA != 0)
-        DmaCopy16(3, gUnknown_02038C28[0], gUnknown_02038C28[1], 320);
+        DmaCopy16(3, gScanlineEffectRegBuffers[0], gScanlineEffectRegBuffers[1], 320);
     REG_WININ = sTransitionStructPtr->WININ;
     REG_WINOUT = sTransitionStructPtr->WINOUT;
     REG_WIN0V = sTransitionStructPtr->WIN0V;
-    DmaSet(0, gUnknown_02038C28[1], &REG_WIN0H, 0xA2400001);
+    DmaSet(0, gScanlineEffectRegBuffers[1], &REG_WIN0H, 0xA2400001);
 }
 
 static void Phase2Task_Sydney(u8 taskId)
@@ -2120,7 +2118,7 @@ static bool8 Phase2_Mugshot_Func1(struct Task *task)
     u8 i;
 
     sub_8149F08();
-    dp12_8087EA4();
+    ScanlineEffect_Clear();
     Mugshots_CreateOpponentPlayerSprites(task);
 
     task->tData1 = 0;
@@ -2132,7 +2130,7 @@ static bool8 Phase2_Mugshot_Func1(struct Task *task)
 
     for (i = 0; i < 160; i++)
     {
-        gUnknown_02038C28[1][i] = 0xF0F1;
+        gScanlineEffectRegBuffers[1][i] = 0xF0F1;
     }
 
     SetVBlankCallback(VBlankCB0_Phase2_Mugshots);
@@ -2177,7 +2175,7 @@ static bool8 Phase2_Mugshot_Func3(struct Task *task)
 
     sTransitionStructPtr->VBlank_DMA = FALSE;
 
-    toStore = gUnknown_02038C28[0];
+    toStore = gScanlineEffectRegBuffers[0];
     r5 = task->tData1;
     task->tData1 += 0x10;
 
@@ -2223,7 +2221,7 @@ static bool8 Phase2_Mugshot_Func4(struct Task *task)
 
     sTransitionStructPtr->VBlank_DMA = FALSE;
 
-    for (i = 0, toStore = gUnknown_02038C28[0]; i < 160; i++, toStore++)
+    for (i = 0, toStore = gScanlineEffectRegBuffers[0]; i < 160; i++, toStore++)
     {
         *toStore = 0xF0;
     }
@@ -2266,8 +2264,8 @@ static bool8 Phase2_Mugshot_Func6(struct Task *task)
         sTransitionStructPtr->VBlank_DMA = FALSE;
         SetVBlankCallback(NULL);
         DmaStop(0);
-        memset(gUnknown_02038C28[0], 0, 0x140);
-        memset(gUnknown_02038C28[1], 0, 0x140);
+        memset(gScanlineEffectRegBuffers[0], 0, 0x140);
+        memset(gScanlineEffectRegBuffers[1], 0, 0x140);
         SetGpuReg(REG_OFFSET_WIN0H, 0xF0);
         SetGpuReg(REG_OFFSET_BLDY, 0);
         task->tState++;
@@ -2300,15 +2298,15 @@ static bool8 Phase2_Mugshot_Func7(struct Task *task)
         {
             s16 index1 = 0x50 - i;
             s16 index2 = 0x50 + i;
-            if (gUnknown_02038C28[0][index1] <= 15)
+            if (gScanlineEffectRegBuffers[0][index1] <= 15)
             {
                 r6 = TRUE;
-                gUnknown_02038C28[0][index1]++;
+                gScanlineEffectRegBuffers[0][index1]++;
             }
-            if (gUnknown_02038C28[0][index2] <= 15)
+            if (gScanlineEffectRegBuffers[0][index2] <= 15)
             {
                 r6 = TRUE;
-                gUnknown_02038C28[0][index2]++;
+                gScanlineEffectRegBuffers[0][index2]++;
             }
         }
     }
@@ -2336,7 +2334,7 @@ static bool8 Phase2_Mugshot_Func9(struct Task *task)
     sTransitionStructPtr->VBlank_DMA = FALSE;
 
     task->tData3++;
-    memset(gUnknown_02038C28[0], task->tData3, 0x140);
+    memset(gScanlineEffectRegBuffers[0], task->tData3, 0x140);
     if (task->tData3 > 15)
         task->tState++;
 
@@ -2357,12 +2355,12 @@ static void VBlankCB0_Phase2_Mugshots(void)
     DmaStop(0);
     VBlankCB_BattleTransition();
     if (sTransitionStructPtr->VBlank_DMA != 0)
-        DmaCopy16(3, gUnknown_02038C28[0], gUnknown_02038C28[1], 320);
+        DmaCopy16(3, gScanlineEffectRegBuffers[0], gScanlineEffectRegBuffers[1], 320);
     REG_BG0VOFS = sTransitionStructPtr->BG0VOFS;
     REG_WININ = sTransitionStructPtr->WININ;
     REG_WINOUT = sTransitionStructPtr->WINOUT;
     REG_WIN0V = sTransitionStructPtr->WIN0V;
-    DmaSet(0, gUnknown_02038C28[1], &REG_WIN0H, 0xA2400001);
+    DmaSet(0, gScanlineEffectRegBuffers[1], &REG_WIN0H, 0xA2400001);
 }
 
 static void VBlankCB1_Phase2_Mugshots(void)
@@ -2370,9 +2368,9 @@ static void VBlankCB1_Phase2_Mugshots(void)
     DmaStop(0);
     VBlankCB_BattleTransition();
     if (sTransitionStructPtr->VBlank_DMA != 0)
-        DmaCopy16(3, gUnknown_02038C28[0], gUnknown_02038C28[1], 320);
+        DmaCopy16(3, gScanlineEffectRegBuffers[0], gScanlineEffectRegBuffers[1], 320);
     REG_BLDCNT = sTransitionStructPtr->BLDCNT;
-    DmaSet(0, gUnknown_02038C28[1], &REG_BLDY, 0xA2400001);
+    DmaSet(0, gScanlineEffectRegBuffers[1], &REG_BLDY, 0xA2400001);
 }
 
 static void HBlankCB_Phase2_Mugshots(void)
@@ -2500,7 +2498,7 @@ static bool8 Phase2_Slice_Func1(struct Task *task)
     u16 i;
 
     sub_8149F08();
-    dp12_8087EA4();
+    ScanlineEffect_Clear();
 
     task->tData2 = 256;
     task->tData3 = 1;
@@ -2511,8 +2509,8 @@ static bool8 Phase2_Slice_Func1(struct Task *task)
 
     for (i = 0; i < 160; i++)
     {
-        gUnknown_02038C28[1][i] = sTransitionStructPtr->field_14;
-        gUnknown_02038C28[1][160 + i] = 0xF0;
+        gScanlineEffectRegBuffers[1][i] = sTransitionStructPtr->field_14;
+        gScanlineEffectRegBuffers[1][160 + i] = 0xF0;
     }
 
     EnableInterrupts(INTR_FLAG_HBLANK);
@@ -2541,8 +2539,8 @@ static bool8 Phase2_Slice_Func2(struct Task *task)
 
     for (i = 0; i < 160; i++)
     {
-        u16 *storeLoc1 = &gUnknown_02038C28[0][i];
-        u16 *storeLoc2 = &gUnknown_02038C28[0][i + 160];
+        u16 *storeLoc1 = &gScanlineEffectRegBuffers[0][i];
+        u16 *storeLoc2 = &gScanlineEffectRegBuffers[0][i + 160];
         if (i & 1)
         {
             *storeLoc1 = sTransitionStructPtr->field_14 + task->tData1;
@@ -2578,15 +2576,15 @@ static void VBlankCB_Phase2_Slice(void)
     REG_WINOUT = sTransitionStructPtr->WINOUT;
     REG_WIN0V = sTransitionStructPtr->WIN0V;
     if (sTransitionStructPtr->VBlank_DMA)
-        DmaCopy16(3, gUnknown_02038C28[0], gUnknown_02038C28[1], 640);
-    DmaSet(0, &gUnknown_02038C28[1][160], &REG_WIN0H, 0xA2400001);
+        DmaCopy16(3, gScanlineEffectRegBuffers[0], gScanlineEffectRegBuffers[1], 640);
+    DmaSet(0, &gScanlineEffectRegBuffers[1][160], &REG_WIN0H, 0xA2400001);
 }
 
 static void HBlankCB_Phase2_Slice(void)
 {
     if (REG_VCOUNT < 160)
     {
-        u16 var = gUnknown_02038C28[1][REG_VCOUNT];
+        u16 var = gScanlineEffectRegBuffers[1][REG_VCOUNT];
         REG_BG1HOFS = var;
         REG_BG2HOFS = var;
         REG_BG3HOFS = var;
@@ -2603,7 +2601,7 @@ static bool8 Phase2_ShredSplit_Func1(struct Task *task)
     u16 i;
 
     sub_8149F08();
-    dp12_8087EA4();
+    ScanlineEffect_Clear();
 
     sTransitionStructPtr->WININ = 63;
     sTransitionStructPtr->WINOUT = 0;
@@ -2611,13 +2609,13 @@ static bool8 Phase2_ShredSplit_Func1(struct Task *task)
 
     for (i = 0; i < 0xA0; i++)
     {
-        gUnknown_02038C28[1][i] = sTransitionStructPtr->field_14;
-        gUnknown_02038C28[1][0xA0 + i] = 0xF0;
-        gUnknown_02038C28[0][i] = sTransitionStructPtr->field_14;
-        gUnknown_02038C28[0][0xA0 + i] = 0xF0;
-        gUnknown_02038C28[0][0x140 + i] = 0;
-        gUnknown_02038C28[0][0x1E0 + i] = 0x100;
-        gUnknown_02038C28[0][0x280 + i] = 1;
+        gScanlineEffectRegBuffers[1][i] = sTransitionStructPtr->field_14;
+        gScanlineEffectRegBuffers[1][0xA0 + i] = 0xF0;
+        gScanlineEffectRegBuffers[0][i] = sTransitionStructPtr->field_14;
+        gScanlineEffectRegBuffers[0][0xA0 + i] = 0xF0;
+        gScanlineEffectRegBuffers[0][0x140 + i] = 0;
+        gScanlineEffectRegBuffers[0][0x1E0 + i] = 0x100;
+        gScanlineEffectRegBuffers[0][0x280 + i] = 1;
     }
 
     task->tData4 = 0;
@@ -2657,9 +2655,9 @@ static bool8 Phase2_ShredSplit_Func2(struct Task *task)
                 unkVar = (arr1[j]) + (arr2[k] * -(i) * 2);
                 if (unkVar >= 0 && (unkVar != 79 || j != 1))
                 {
-                    ptr4 = &gUnknown_02038C28[0][unkVar + 320];
-                    ptr3 = &gUnknown_02038C28[0][unkVar + 480];
-                    ptr1 = &gUnknown_02038C28[0][unkVar + 640];
+                    ptr4 = &gScanlineEffectRegBuffers[0][unkVar + 320];
+                    ptr3 = &gScanlineEffectRegBuffers[0][unkVar + 480];
+                    ptr1 = &gScanlineEffectRegBuffers[0][unkVar + 640];
                     if (*ptr4 > 0xEF)
                     {
                         *ptr4 = 0xF0;
@@ -2673,8 +2671,8 @@ static bool8 Phase2_ShredSplit_Func2(struct Task *task)
                         if (*ptr3 <= 0xFFF)
                             *ptr3 += *ptr1;
                     }
-                    ptr2 = &gUnknown_02038C28[0][unkVar];
-                    ptr3 = &gUnknown_02038C28[0][unkVar + 160];
+                    ptr2 = &gScanlineEffectRegBuffers[0][unkVar];
+                    ptr3 = &gScanlineEffectRegBuffers[0][unkVar + 160];
                     *ptr2 = sTransitionStructPtr->field_14 + *ptr4;
                     *ptr3 = 0xF0 - *ptr4;
 
@@ -2691,9 +2689,9 @@ static bool8 Phase2_ShredSplit_Func2(struct Task *task)
                 unkVar = (arr1[j] + 1) + (arr2[k] * -(i) * 2);
                 if (unkVar <= 160 && (unkVar != 80 || j != 1))
                 {
-                    ptr4 = &gUnknown_02038C28[0][unkVar + 320];
-                    ptr3 = &gUnknown_02038C28[0][unkVar + 480];
-                    ptr1 = &gUnknown_02038C28[0][unkVar + 640];
+                    ptr4 = &gScanlineEffectRegBuffers[0][unkVar + 320];
+                    ptr3 = &gScanlineEffectRegBuffers[0][unkVar + 480];
+                    ptr1 = &gScanlineEffectRegBuffers[0][unkVar + 640];
                     if (*ptr4 > 0xEF)
                     {
                         *ptr4 = 0xF0;
@@ -2707,8 +2705,8 @@ static bool8 Phase2_ShredSplit_Func2(struct Task *task)
                         if (*ptr3 <= 0xFFF)
                             *ptr3 += *ptr1;
                     }
-                    ptr2 = &gUnknown_02038C28[0][unkVar];
-                    ptr3 = &gUnknown_02038C28[0][unkVar + 160];
+                    ptr2 = &gScanlineEffectRegBuffers[0][unkVar];
+                    ptr3 = &gScanlineEffectRegBuffers[0][unkVar + 160];
                     *ptr2 = sTransitionStructPtr->field_14 - *ptr4;
                     *ptr3 = (*ptr4 << 8) | (0xF1);
 
@@ -2732,7 +2730,7 @@ static bool8 Phase2_ShredSplit_Func2(struct Task *task)
 
 // This function never increments the state counter, because the loop condition
 // is always false, resulting in the game being stuck in an infinite loop.
-// It's possible this transition is only partially 
+// It's possible this transition is only partially
 // done and the second part was left out.
 static bool8 Phase2_ShredSplit_Func3(struct Task *task)
 {
@@ -2742,7 +2740,7 @@ static bool8 Phase2_ShredSplit_Func3(struct Task *task)
 
     for (i = 0; i < 0xA0; i++)
     {
-        if (gUnknown_02038C28[1][i] != 0xF0 && gUnknown_02038C28[1][i] != checkVar2)
+        if (gScanlineEffectRegBuffers[1][i] != 0xF0 && gScanlineEffectRegBuffers[1][i] != checkVar2)
             done = FALSE; // a break statement should be put here
     }
 
@@ -2775,7 +2773,7 @@ static bool8 Phase2_Blackhole_Func1(struct Task *task)
     s32 i;
 
     sub_8149F08();
-    dp12_8087EA4();
+    ScanlineEffect_Clear();
 
     sTransitionStructPtr->WININ = 0;
     sTransitionStructPtr->WINOUT = 63;
@@ -2784,7 +2782,7 @@ static bool8 Phase2_Blackhole_Func1(struct Task *task)
 
     for (i = 0; i < 0xA0; i++)
     {
-        gUnknown_02038C28[1][i] = 0;
+        gScanlineEffectRegBuffers[1][i] = 0;
     }
 
     SetVBlankCallback(VBlankCB1_Phase2_BigPokeball);
@@ -2814,7 +2812,7 @@ static bool8 Phase2_Blackhole1_Func3(struct Task *task)
             task->tData1 += (task->tData2 >> 8);
         if (task->tData1 > 0xA0)
             task->tData1 = 0xA0;
-        sub_814A014(gUnknown_02038C28[0], 0x78, 0x50, task->tData1);
+        sub_814A014(gScanlineEffectRegBuffers[0], 0x78, 0x50, task->tData1);
         if (task->tData1 == 0xA0)
         {
             task->tFuncState = 1;
@@ -2840,7 +2838,7 @@ static bool8 Phase2_Blackhole1_Func2(struct Task *task)
     }
     task->tData1 += gUnknown_085C8C80[task->tData6];
     task->tData6 = (task->tData6 + 1) % 2;
-    sub_814A014(gUnknown_02038C28[0], 0x78, 0x50, task->tData1);
+    sub_814A014(gScanlineEffectRegBuffers[0], 0x78, 0x50, task->tData1);
     if (task->tData1 < 9)
     {
         task->tState++;
@@ -2866,7 +2864,7 @@ static bool8 Phase2_Blackhole2_Func2(struct Task *task)
     if (task->tData1 > 0xA0)
         task->tData1 = 0xA0;
 
-    sub_814A014(gUnknown_02038C28[0], 0x78, 0x50, task->tData1);
+    sub_814A014(gScanlineEffectRegBuffers[0], 0x78, 0x50, task->tData1);
     if (task->tData1 == 0xA0)
     {
         DmaStop(0);
@@ -3113,7 +3111,7 @@ static bool8 Phase2_Rayquaza_Func3(struct Task *task)
     u16 i;
 
     sub_8149F08();
-    dp12_8087EA4();
+    ScanlineEffect_Clear();
 
     SetGpuReg(REG_OFFSET_BG0CNT, 0x9A08);
     sub_8149F58(&dst1, &dst2);
@@ -3126,8 +3124,8 @@ static bool8 Phase2_Rayquaza_Func3(struct Task *task)
 
     for (i = 0; i < 160; i++)
     {
-        gUnknown_02038C28[0][i] = 0;
-        gUnknown_02038C28[1][i] = 0x100;
+        gScanlineEffectRegBuffers[0][i] = 0;
+        gScanlineEffectRegBuffers[1][i] = 0x100;
     }
 
     SetVBlankCallback(VBlankCB_Phase2_Rayquaza);
@@ -3212,7 +3210,7 @@ static bool8 Phase2_Rayquaza_Func9(struct Task *task)
 
         for (i = 0; i < 160; i++)
         {
-            gUnknown_02038C28[1][i] = 0;
+            gScanlineEffectRegBuffers[1][i] = 0;
         }
 
         SetVBlankCallback(VBlankCB1_Phase2_BigPokeball);
@@ -3233,11 +3231,11 @@ static void VBlankCB_Phase2_Rayquaza(void)
     VBlankCB_BattleTransition();
 
     if (sTransitionStructPtr->field_20 == 0)
-        dmaSrc = gUnknown_02038C28[0];
+        dmaSrc = gScanlineEffectRegBuffers[0];
     else if (sTransitionStructPtr->field_20 == 1)
-        dmaSrc = gUnknown_02038C28[1];
+        dmaSrc = gScanlineEffectRegBuffers[1];
     else
-        dmaSrc = gUnknown_02038C28[0];
+        dmaSrc = gScanlineEffectRegBuffers[0];
 
     DmaSet(0, dmaSrc, &REG_BG0VOFS, 0xA2400001);
 }
@@ -3252,7 +3250,7 @@ static bool8 Phase2_WhiteFade_Func1(struct Task *task)
     u16 i;
 
     sub_8149F08();
-    dp12_8087EA4();
+    ScanlineEffect_Clear();
 
     sTransitionStructPtr->BLDCNT = 0xBF;
     sTransitionStructPtr->BLDY = 0;
@@ -3262,8 +3260,8 @@ static bool8 Phase2_WhiteFade_Func1(struct Task *task)
 
     for (i = 0; i < 160; i++)
     {
-        gUnknown_02038C28[1][i] = 0;
-        gUnknown_02038C28[1][i + 160] = 0xF0;
+        gScanlineEffectRegBuffers[1][i] = 0;
+        gScanlineEffectRegBuffers[1][i + 160] = 0xF0;
     }
 
     EnableInterrupts(INTR_FLAG_HBLANK);
@@ -3343,8 +3341,8 @@ static void VBlankCB0_Phase2_WhiteFade(void)
     REG_WINOUT = sTransitionStructPtr->WINOUT;
     REG_WIN0V = sTransitionStructPtr->WIN0V;
     if (sTransitionStructPtr->VBlank_DMA)
-        DmaCopy16(3, gUnknown_02038C28[0], gUnknown_02038C28[1], 640);
-    DmaSet(0, &gUnknown_02038C28[1][160], &REG_WIN0H, 0xA2400001);
+        DmaCopy16(3, gScanlineEffectRegBuffers[0], gScanlineEffectRegBuffers[1], 640);
+    DmaSet(0, &gScanlineEffectRegBuffers[1][160], &REG_WIN0H, 0xA2400001);
 }
 
 static void VBlankCB1_Phase2_WhiteFade(void)
@@ -3360,7 +3358,7 @@ static void VBlankCB1_Phase2_WhiteFade(void)
 
 static void HBlankCB_Phase2_WhiteFade(void)
 {
-    REG_BLDY = gUnknown_02038C28[1][REG_VCOUNT];
+    REG_BLDY = gScanlineEffectRegBuffers[1][REG_VCOUNT];
 }
 
 static void sub_8149864(struct Sprite *sprite)
@@ -3374,8 +3372,8 @@ static void sub_8149864(struct Sprite *sprite)
     else
     {
         u16 i;
-        u16* ptr1 = &gUnknown_02038C28[0][sprite->pos1.y];
-        u16* ptr2 = &gUnknown_02038C28[0][sprite->pos1.y + 160];
+        u16* ptr1 = &gScanlineEffectRegBuffers[0][sprite->pos1.y];
+        u16* ptr2 = &gScanlineEffectRegBuffers[0][sprite->pos1.y + 160];
         for (i = 0; i < 20; i++)
         {
             ptr1[i] = sprite->data[0] >> 8;
@@ -3465,7 +3463,7 @@ static bool8 Phase2_Shards_Func1(struct Task *task)
     u16 i;
 
     sub_8149F08();
-    dp12_8087EA4();
+    ScanlineEffect_Clear();
 
     sTransitionStructPtr->WININ = 0x3F;
     sTransitionStructPtr->WINOUT = 0;
@@ -3473,10 +3471,10 @@ static bool8 Phase2_Shards_Func1(struct Task *task)
 
     for (i = 0; i < 160; i++)
     {
-        gUnknown_02038C28[0][i] = 0xF0;
+        gScanlineEffectRegBuffers[0][i] = 0xF0;
     }
 
-    CpuSet(gUnknown_02038C28[0], gUnknown_02038C28[1], 0xA0);
+    CpuSet(gScanlineEffectRegBuffers[0], gScanlineEffectRegBuffers[1], 0xA0);
     SetVBlankCallback(VBlankCB_Phase2_Shards);
 
     task->tState++;
@@ -3505,8 +3503,8 @@ static bool8 Phase2_Shards_Func3(struct Task *task)
 
     for (i = 0, nextFunc = FALSE; i < 16; i++)
     {
-        s16 r3 = gUnknown_02038C28[0][sTransitionStructPtr->data[3]] >> 8;
-        s16 r4 = gUnknown_02038C28[0][sTransitionStructPtr->data[3]] & 0xFF;
+        s16 r3 = gScanlineEffectRegBuffers[0][sTransitionStructPtr->data[3]] >> 8;
+        s16 r4 = gScanlineEffectRegBuffers[0][sTransitionStructPtr->data[3]] & 0xFF;
         if (task->tData2 == 0)
         {
             if (r3 < sTransitionStructPtr->data[2])
@@ -3521,7 +3519,7 @@ static bool8 Phase2_Shards_Func3(struct Task *task)
             if (r4 <= r3)
                 r4 = r3;
         }
-        gUnknown_02038C28[0][sTransitionStructPtr->data[3]] = (r4) | (r3 << 8);
+        gScanlineEffectRegBuffers[0][sTransitionStructPtr->data[3]] = (r4) | (r3 << 8);
         if (nextFunc)
         {
             task->tState++;
@@ -3568,12 +3566,12 @@ static void VBlankCB_Phase2_Shards(void)
     DmaStop(0);
     VBlankCB_BattleTransition();
     if (sTransitionStructPtr->VBlank_DMA)
-        DmaCopy16(3, gUnknown_02038C28[0], gUnknown_02038C28[1], 320);
+        DmaCopy16(3, gScanlineEffectRegBuffers[0], gScanlineEffectRegBuffers[1], 320);
     REG_WININ = sTransitionStructPtr->WININ;
     REG_WINOUT = sTransitionStructPtr->WINOUT;
     REG_WIN0V = sTransitionStructPtr->WIN0V;
-    REG_WIN0H = gUnknown_02038C28[1][0];
-    DmaSet(0, gUnknown_02038C28[1], &REG_WIN0H, 0xA2400001);
+    REG_WIN0H = gScanlineEffectRegBuffers[1][0];
+    DmaSet(0, gScanlineEffectRegBuffers[1], &REG_WIN0H, 0xA2400001);
 }
 
 // sub-task for phase2
@@ -3875,7 +3873,7 @@ static bool8 Phase2_29_Func2(struct Task *task)
 
     sub_8149F58(&dst1, &dst2);
     LZ77UnCompVram(gUnknown_085C828C, dst1);
-    sub_8149F98(gUnknown_02038C28[0], 0, task->tData4, 0x84, task->tData5, 160);
+    sub_8149F98(gScanlineEffectRegBuffers[0], 0, task->tData4, 0x84, task->tData5, 160);
 
     task->tState++;
     return TRUE;
@@ -3896,7 +3894,7 @@ static bool8 Phase2_30_Func1(struct Task *task)
     u16 *dst1, *dst2;
 
     sub_8149F08();
-    dp12_8087EA4();
+    ScanlineEffect_Clear();
     ClearGpuRegBits(REG_OFFSET_DISPCNT, DISPCNT_WIN0_ON | DISPCNT_WIN1_ON);
     task->tData2 = 0x2000;
     task->tData1 = 0x7FFF;
@@ -3934,7 +3932,7 @@ static bool8 Phase2_30_Func3(struct Task *task)
 
     for (i = 0; i < 160; i++)
     {
-        gUnknown_02038C28[1][i] = sTransitionStructPtr->field_16;
+        gScanlineEffectRegBuffers[1][i] = sTransitionStructPtr->field_16;
     }
 
     SetVBlankCallback(VBlankCB_Phase2_30);
@@ -3980,7 +3978,7 @@ static bool8 Phase2_30_Func4(struct Task *task)
     {
         s16 index = var6 / 256;
         asm("");
-        gUnknown_02038C28[0][i] = sTransitionStructPtr->field_16 + Sin(index, amplitude);
+        gScanlineEffectRegBuffers[0][i] = sTransitionStructPtr->field_16 + Sin(index, amplitude);
     }
 
     if (++task->tData3 == 101)
@@ -4004,12 +4002,12 @@ static void VBlankCB_Phase2_30(void)
     REG_BLDALPHA = sTransitionStructPtr->BLDALPHA;
 
     if (sTransitionStructPtr->VBlank_DMA)
-        DmaCopy16(3, gUnknown_02038C28[0], gUnknown_02038C28[1], 320);
+        DmaCopy16(3, gScanlineEffectRegBuffers[0], gScanlineEffectRegBuffers[1], 320);
 }
 
 static void HBlankCB_Phase2_30(void)
 {
-    u16 var = gUnknown_02038C28[1][REG_VCOUNT];
+    u16 var = gScanlineEffectRegBuffers[1][REG_VCOUNT];
     REG_BG0VOFS = var;
 }
 
diff --git a/src/berry_fix_program.c b/src/berry_fix_program.c
index f487489d4..7b968a221 100644
--- a/src/berry_fix_program.c
+++ b/src/berry_fix_program.c
@@ -6,7 +6,7 @@
 #include "main.h"
 #include "sprite.h"
 #include "task.h"
-#include "unknown_task.h"
+#include "scanline_effect.h"
 #include "window.h"
 #include "text.h"
 #include "menu.h"
diff --git a/src/diploma.c b/src/diploma.c
index 24e5e9727..89447c5ba 100644
--- a/src/diploma.c
+++ b/src/diploma.c
@@ -3,7 +3,7 @@
 #include "palette.h"
 #include "main.h"
 #include "gpu_regs.h"
-#include "unknown_task.h"
+#include "scanline_effect.h"
 #include "task.h"
 #include "malloc.h"
 #include "decompress.h"
diff --git a/src/evolution_scene.c b/src/evolution_scene.c
index 5dfc36cb2..cbd37be52 100644
--- a/src/evolution_scene.c
+++ b/src/evolution_scene.c
@@ -11,7 +11,7 @@
 #include "pokemon.h"
 #include "string_util.h"
 #include "battle.h"
-#include "unknown_task.h"
+#include "scanline_effect.h"
 #include "decompress.h"
 #include "m4a.h"
 #include "menu.h"
@@ -1367,7 +1367,7 @@ static void VBlankCB_EvolutionScene(void)
     LoadOam();
     ProcessSpriteCopyRequests();
     TransferPlttBuffer();
-    sub_80BA0A8();
+    ScanlineEffect_InitHBlankDmaTransfer();
 }
 
 static void VBlankCB_TradeEvolutionScene(void)
@@ -1384,7 +1384,7 @@ static void VBlankCB_TradeEvolutionScene(void)
     LoadOam();
     ProcessSpriteCopyRequests();
     TransferPlttBuffer();
-    sub_80BA0A8();
+    ScanlineEffect_InitHBlankDmaTransfer();
 }
 
 static void sub_813FDEC(u8 taskId)
diff --git a/src/hall_of_fame.c b/src/hall_of_fame.c
index d002f210f..e7caf9316 100644
--- a/src/hall_of_fame.c
+++ b/src/hall_of_fame.c
@@ -20,7 +20,7 @@
 #include "string_util.h"
 #include "m4a.h"
 #include "international_string_util.h"
-#include "unknown_task.h"
+#include "scanline_effect.h"
 #include "trig.h"
 #include "random.h"
 #include "event_data.h"
diff --git a/src/mail.c b/src/mail.c
index c3cbe4a3c..ac263ac67 100644
--- a/src/mail.c
+++ b/src/mail.c
@@ -4,7 +4,7 @@
 #include "main.h"
 #include "overworld.h"
 #include "task.h"
-#include "unknown_task.h"
+#include "scanline_effect.h"
 #include "palette.h"
 #include "text.h"
 #include "menu.h"
diff --git a/src/option_menu.c b/src/option_menu.c
index 7f92756ab..cbbe14b77 100644
--- a/src/option_menu.c
+++ b/src/option_menu.c
@@ -2,7 +2,7 @@
 #include "option_menu.h"
 #include "main.h"
 #include "menu.h"
-#include "unknown_task.h"
+#include "scanline_effect.h"
 #include "palette.h"
 #include "sprite.h"
 #include "task.h"
diff --git a/src/pokeblock.c b/src/pokeblock.c
index 1a4ce3155..472b030e0 100644
--- a/src/pokeblock.c
+++ b/src/pokeblock.c
@@ -14,7 +14,7 @@
 #include "battle.h"
 #include "battle_controllers.h"
 #include "palette.h"
-#include "unknown_task.h"
+#include "scanline_effect.h"
 #include "list_menu.h"
 #include "gpu_regs.h"
 #include "decompress.h"
diff --git a/src/reshow_battle_screen.c b/src/reshow_battle_screen.c
index 3df2ff151..a4bb4a728 100644
--- a/src/reshow_battle_screen.c
+++ b/src/reshow_battle_screen.c
@@ -3,7 +3,7 @@
 #include "battle.h"
 #include "palette.h"
 #include "main.h"
-#include "unknown_task.h"
+#include "scanline_effect.h"
 #include "text.h"
 #include "gpu_regs.h"
 #include "bg.h"
@@ -34,7 +34,7 @@ extern struct SpriteTemplate gUnknown_0202499C;
 
 extern const union AnimCmd * const * const gMonAnimationsSpriteAnimsPtrTable[];
 
-extern void dp12_8087EA4(void);
+extern void ScanlineEffect_Clear(void);
 extern void sub_8035658(void);
 extern bool8 IsDoubleBattle(void);
 extern u8 GetSubstituteSpriteDefault_Y(u8 bank);
@@ -72,7 +72,7 @@ static void CB2_ReshowBattleScreenAfterMenu(void)
     switch (gBattleScripting.reshowMainState)
     {
     case 0:
-        dp12_8087EA4();
+        ScanlineEffect_Clear();
         sub_8035658();
         SetBgAttribute(1, BG_CTRL_ATTR_VISIBLE, 0);
         SetBgAttribute(2, BG_CTRL_ATTR_VISIBLE, 0);
diff --git a/src/scanline_effect.c b/src/scanline_effect.c
new file mode 100644
index 000000000..148e053fc
--- /dev/null
+++ b/src/scanline_effect.c
@@ -0,0 +1,262 @@
+#include "global.h"
+#include "data2.h"
+#include "task.h"
+#include "trig.h"
+#include "scanline_effect.h"
+
+static void CopyValue16Bit(void);
+static void CopyValue32Bit(void);
+
+extern u16 gBattle_BG0_Y;
+extern u16 gBattle_BG0_X;
+extern u16 gBattle_BG1_X;
+extern u16 gBattle_BG1_Y;
+extern u16 gBattle_BG2_X;
+extern u16 gBattle_BG2_Y;
+extern u16 gBattle_BG3_X;
+extern u16 gBattle_BG3_Y;
+
+// EWRAM vars
+
+// Per-scanline register values.
+// This is double buffered so that it can be safely written to at any time
+// without overwriting the buffer that the DMA is currently reading
+EWRAM_DATA u16 gScanlineEffectRegBuffers[2][0x3C0] = {0};
+
+EWRAM_DATA struct ScanlineEffect gScanlineEffect = {0};
+EWRAM_DATA static bool8 sShouldStopWaveTask = FALSE;
+
+void ScanlineEffect_Stop(void)
+{
+    gScanlineEffect.state = 0;
+    DmaStop(0);
+    if (gScanlineEffect.waveTaskId != 0xFF)
+    {
+        DestroyTask(gScanlineEffect.waveTaskId);
+        gScanlineEffect.waveTaskId = 0xFF;
+    }
+}
+
+void ScanlineEffect_Clear(void)
+{
+    CpuFill16(0, gScanlineEffectRegBuffers, sizeof(gScanlineEffectRegBuffers));
+    gScanlineEffect.dmaSrcBuffers[0] = NULL;
+    gScanlineEffect.dmaSrcBuffers[1] = NULL;
+    gScanlineEffect.dmaDest = NULL;
+    gScanlineEffect.dmaControl = 0;
+    gScanlineEffect.srcBuffer = 0;
+    gScanlineEffect.state = 0;
+    gScanlineEffect.unused16 = 0;
+    gScanlineEffect.unused17 = 0;
+    gScanlineEffect.waveTaskId = 0xFF;
+}
+
+void ScanlineEffect_SetParams(struct ScanlineEffectParams params)
+{
+    if (params.dmaControl == SCANLINE_EFFECT_DMACNT_16BIT)  // 16-bit
+    {
+        // Set the DMA src to the value for the second scanline because the
+        // first DMA transfer occurs in HBlank *after* the first scanline is drawn
+        gScanlineEffect.dmaSrcBuffers[0] = (u16 *)gScanlineEffectRegBuffers[0] + 1;
+        gScanlineEffect.dmaSrcBuffers[1] = (u16 *)gScanlineEffectRegBuffers[1] + 1;
+        gScanlineEffect.setFirstScanlineReg = CopyValue16Bit;
+    }
+    else  // assume 32-bit
+    {
+        // Set the DMA src to the value for the second scanline because the
+        // first DMA transfer occurs in HBlank *after* the first scanline is drawn
+        gScanlineEffect.dmaSrcBuffers[0] = (u32 *)gScanlineEffectRegBuffers[0] + 1;
+        gScanlineEffect.dmaSrcBuffers[1] = (u32 *)gScanlineEffectRegBuffers[1] + 1;
+        gScanlineEffect.setFirstScanlineReg = CopyValue32Bit;
+    }
+
+    gScanlineEffect.dmaControl = params.dmaControl;
+    gScanlineEffect.dmaDest    = params.dmaDest;
+    gScanlineEffect.state      = params.initState;
+    gScanlineEffect.unused16   = params.unused9;
+    gScanlineEffect.unused17   = params.unused9;
+}
+
+void ScanlineEffect_InitHBlankDmaTransfer(void)
+{
+    if (gScanlineEffect.state == 0)
+    {
+        return;
+    }
+    else if (gScanlineEffect.state == 3)
+    {
+        gScanlineEffect.state = 0;
+        DmaStop(0);
+        sShouldStopWaveTask = TRUE;
+    }
+    else
+    {
+        DmaStop(0);
+        // Set DMA to copy to dest register on each HBlank for the next frame.
+        // The HBlank DMA transfers do not occurr during VBlank, so the transfer
+        // will begin on the HBlank after the first scanline
+        DmaSet(0, gScanlineEffect.dmaSrcBuffers[gScanlineEffect.srcBuffer], gScanlineEffect.dmaDest, gScanlineEffect.dmaControl);
+        // Manually set the reg for the first scanline
+        gScanlineEffect.setFirstScanlineReg();
+        // Swap current buffer
+        gScanlineEffect.srcBuffer ^= 1;
+    }
+}
+
+// These two functions are used to copy the register for the first scanline,
+// depending whether it is a 16-bit register or a 32-bit register.
+
+static void CopyValue16Bit(void)
+{
+    u16 *dest = (u16 *)gScanlineEffect.dmaDest;
+    u16 *src = (u16 *)&gScanlineEffectRegBuffers[gScanlineEffect.srcBuffer];
+
+    *dest = *src;
+}
+
+static void CopyValue32Bit(void)
+{
+    u32 *dest = (u32 *)gScanlineEffect.dmaDest;
+    u32 *src = (u32 *)&gScanlineEffectRegBuffers[gScanlineEffect.srcBuffer];
+
+    *dest = *src;
+}
+
+#define tStartLine            data[0]
+#define tEndLine              data[1]
+#define tWaveLength           data[2]
+#define tSrcBufferOffset      data[3]
+#define tFramesUntilMove      data[4]
+#define tDelayInterval        data[5]
+#define tRegOffset            data[6]
+#define tApplyBattleBgOffsets data[7]
+
+static void TaskFunc_UpdateWavePerFrame(u8 taskId)
+{
+    int value = 0;
+    int i;
+    int offset;
+
+    if (sShouldStopWaveTask)
+    {
+        DestroyTask(taskId);
+        gScanlineEffect.waveTaskId = 0xFF;
+    }
+    else
+    {
+        if (gTasks[taskId].tApplyBattleBgOffsets)
+        {
+            switch (gTasks[taskId].tRegOffset)
+            {
+            case SCANLINE_EFFECT_REG_BG0HOFS:
+                value = gBattle_BG0_X;
+                break;
+            case SCANLINE_EFFECT_REG_BG0VOFS:
+                value = gBattle_BG0_Y;
+                break;
+            case SCANLINE_EFFECT_REG_BG1HOFS:
+                value = gBattle_BG1_X;
+                break;
+            case SCANLINE_EFFECT_REG_BG1VOFS:
+                value = gBattle_BG1_Y;
+                break;
+            case SCANLINE_EFFECT_REG_BG2HOFS:
+                value = gBattle_BG2_X;
+                break;
+            case SCANLINE_EFFECT_REG_BG2VOFS:
+                value = gBattle_BG2_Y;
+                break;
+            case SCANLINE_EFFECT_REG_BG3HOFS:
+                value = gBattle_BG3_X;
+                break;
+            case SCANLINE_EFFECT_REG_BG3VOFS:
+                value = gBattle_BG3_Y;
+                break;
+            }
+        }
+        if (gTasks[taskId].tFramesUntilMove != 0)
+        {
+            gTasks[taskId].tFramesUntilMove--;
+            offset = gTasks[taskId].tSrcBufferOffset + 320;
+            for (i = gTasks[taskId].tStartLine; i < gTasks[taskId].tEndLine; i++)
+            {
+                gScanlineEffectRegBuffers[gScanlineEffect.srcBuffer][i] = gScanlineEffectRegBuffers[0][offset] + value;
+                offset++;
+            }
+        }
+        else
+        {
+            gTasks[taskId].tFramesUntilMove = gTasks[taskId].tDelayInterval;
+            offset = gTasks[taskId].tSrcBufferOffset + 320;
+            for (i = gTasks[taskId].tStartLine; i < gTasks[taskId].tEndLine; i++)
+            {
+                gScanlineEffectRegBuffers[gScanlineEffect.srcBuffer][i] = gScanlineEffectRegBuffers[0][offset] + value;
+                offset++;
+            }
+
+            // increment src buffer offset
+            gTasks[taskId].tSrcBufferOffset++;
+            if (gTasks[taskId].tSrcBufferOffset == gTasks[taskId].tWaveLength)
+                gTasks[taskId].tSrcBufferOffset = 0;
+        }
+    }
+}
+
+static void GenerateWave(u16 *buffer, u8 frequency, u8 amplitude, u8 unused)
+{
+    u16 i = 0;
+    u8 theta = 0;
+
+    while (i < 256)
+    {
+        buffer[i] = (gSineTable[theta] * amplitude) / 256;
+        theta += frequency;
+        i++;
+    }
+}
+
+// Initializes a background "wave" effect that affects scanlines startLine (inclusive) to endLine (exclusive).
+// 'frequency' and 'amplitude' control the frequency and amplitude of the wave.
+// 'delayInterval' controls how fast the wave travels up the screen. The wave will shift upwards one scanline every 'delayInterval'+1 frames.
+// 'regOffset' is the offset of the video register to modify.
+u8 ScanlineEffect_InitWave(u8 startLine, u8 endLine, u8 frequency, u8 amplitude, u8 delayInterval, u8 regOffset, bool8 applyBattleBgOffsets)
+{
+    int i;
+    int offset;
+    struct ScanlineEffectParams params;
+    u8 taskId;
+
+    ScanlineEffect_Clear();
+
+    params.dmaDest = (void *)(REG_ADDR_BG0HOFS + regOffset);
+    params.dmaControl = SCANLINE_EFFECT_DMACNT_16BIT;
+    params.initState = 1;
+    params.unused9 = 0;
+    ScanlineEffect_SetParams(params);
+
+    taskId = CreateTask(TaskFunc_UpdateWavePerFrame, 0);
+
+    gTasks[taskId].tStartLine            = startLine;
+    gTasks[taskId].tEndLine              = endLine;
+    gTasks[taskId].tWaveLength           = 256 / frequency;
+    gTasks[taskId].tSrcBufferOffset      = 0;
+    gTasks[taskId].tFramesUntilMove      = delayInterval;
+    gTasks[taskId].tDelayInterval        = delayInterval;
+    gTasks[taskId].tRegOffset            = regOffset;
+    gTasks[taskId].tApplyBattleBgOffsets = applyBattleBgOffsets;
+
+    gScanlineEffect.waveTaskId = taskId;
+    sShouldStopWaveTask = FALSE;
+
+    GenerateWave(&gScanlineEffectRegBuffers[0][320], frequency, amplitude, endLine - startLine);
+
+    offset = 320;
+    for (i = startLine; i < endLine; i++)
+    {
+        gScanlineEffectRegBuffers[0][i] = gScanlineEffectRegBuffers[0][offset];
+        gScanlineEffectRegBuffers[1][i] = gScanlineEffectRegBuffers[0][offset];
+        offset++;
+    }
+
+    return taskId;
+}
diff --git a/src/use_pokeblock.c b/src/use_pokeblock.c
index 12f475c93..c8898d08f 100644
--- a/src/use_pokeblock.c
+++ b/src/use_pokeblock.c
@@ -4,7 +4,7 @@
 #include "malloc.h"
 #include "palette.h"
 #include "pokenav.h"
-#include "unknown_task.h"
+#include "scanline_effect.h"
 #include "text.h"
 #include "bg.h"
 #include "window.h"
@@ -131,7 +131,7 @@ void sub_8166340(void)
     ProcessSpriteCopyRequests();
     TransferPlttBuffer();
     sub_81D2108(gUnknown_0203BCAC->field_7C58);
-    sub_80BA0A8();
+    ScanlineEffect_InitHBlankDmaTransfer();
 }
 
 void sub_816636C(void (*func)(void))
diff --git a/src/wallclock.c b/src/wallclock.c
index dbea24b4c..f15bbbc27 100644
--- a/src/wallclock.c
+++ b/src/wallclock.c
@@ -12,7 +12,7 @@
 #include "window.h"
 #include "text_window.h"
 #include "menu.h"
-#include "unknown_task.h"
+#include "scanline_effect.h"
 #include "task.h"
 #include "strings.h"
 #include "sound.h"
diff --git a/sym_ewram.txt b/sym_ewram.txt
index c04f524d8..df3987e68 100644
--- a/sym_ewram.txt
+++ b/sym_ewram.txt
@@ -713,36 +713,7 @@ gUnknown_02038BC6: @ 2038BC6
 gFieldEffectArguments: @ 2038C08
 	.space 0x20
 
-gUnknown_02038C28: @ 2038C28
-	.space 0x2
-
-gUnknown_02038C2A: @ 2038C2A
-	.space 0x2
-
-gUnknown_02038C2C: @ 2038C2C
-	.space 0x13C
-
-gUnknown_02038D68: @ 2038D68
-	.space 0x140
-
-gUnknown_02038EA8: @ 2038EA8
-	.space 0x280
-
-gUnknown_02039128: @ 2039128
-	.space 0x280
-
-gUnknown_020393A8: @ 20393A8
-	.space 0x140
-
-gUnknown_020394E8: @ 20394E8
-	.space 0x640
-
-gUnknown_02039B28: @ 2039B28
-	.space 0x1C
-
-gUnknown_02039B44: @ 2039B44
-	.space 0x4
-
+    .include "src/scanline_effect.o"
     .include "src/option_menu.o"
 	
 	.align 2
author	Diegoisawesome <Diegoisawesome@users.noreply.github.com>	2018-01-30 15:37:34 -0600
committer	GitHub <noreply@github.com>	2018-01-30 15:37:34 -0600
commit	232dea1a63929ce10f000ddc18c36c22a72827a4 (patch)
tree	2b371cf05eec75a81eac09bdcbef80e8e91da278
parent	ef4313d42f38199f8420b985e4b2c7b96c62997d (diff)
parent	db3ecf5012612ed08aab55f4a8993afea74a4216 (diff)