3 files changed, 50 insertions, 44 deletions
diff --git a/include/data2.h b/include/data2.h
index 97cb4fd7a..9f6644714 100644
--- a/include/data2.h
+++ b/include/data2.h
@@ -3,7 +3,7 @@
 
 #include "sprite.h"
 
-struct UnknownTaskStruct;
+struct ScanlineEffectParams;
 
 struct MonCoords
 {
@@ -42,7 +42,7 @@ extern u8 gSpeciesNames[][11];
 extern const u8 gMoveNames[][13];
 extern const u8 gAbilityNames[][13];
 extern const u8 gTypeNames[][7];
-extern const struct UnknownTaskStruct gUnknown_081F9674;
+extern const struct ScanlineEffectParams gUnknown_081F9674;
 extern const u8 gUnknown_081F96C8[];
 extern struct CompressedSpriteSheet gUnknown_081FAEA4;
 extern struct CompressedSpritePalette gUnknown_081FAEAC;
diff --git a/include/scanline_effect.h b/include/scanline_effect.h
new file mode 100644
index 000000000..314a856fa
--- /dev/null
+++ b/include/scanline_effect.h
@@ -0,0 +1,48 @@
+#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;
+    u8 filler19[0x7];
+};
+
+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 011e5f5b5..000000000
--- a/include/unknown_task.h
+++ /dev/null
@@ -1,42 +0,0 @@
-#ifndef GUARD_UNKNOWN_TASK_H
-#define GUARD_UNKNOWN_TASK_H
-
-struct UnknownTaskStruct
-{
-    volatile void *dest;
-    u32 control;
-    u8 unk8;
-    u8 unk9;
-};
-
-struct UnknownTaskStruct2
-{
-    void *src[2];
-    volatile void *dest;
-    u32 unkC;
-    void (*unk10)(void);
-    u8 srcBank;
-    u8 unk15;
-    u8 unk16;
-    u8 unk17;
-    u8 taskId;
-    u8 filler19[0x7];
-};
-
-extern struct UnknownTaskStruct2 gUnknown_03004DC0;
-
-extern u16 gUnknown_03004DE0[][0x3C0];
-
-void remove_some_task(void);
-void remove_some_task(void);
-void dp12_8087EA4(void);
-void dp12_8087EA4(void);
-//void sub_80895F8(u32 i, u32 i1, u32 i2);
-//void sub_80895F8();
-void sub_80895F8(struct UnknownTaskStruct unk);
-void sub_8089668(void);
-void sub_8089668();
-//void sub_8089944(int i, int i1, int i2, int i3, int i4, int i5, int i6);
-u8 sub_8089944(u8 a1, u8 a2, u8 a3, u8 a4, u8 a5, u8 a6, u8 a7);
-
-#endif // GUARD_UNKNOWN_TASK_H