Break up pokenav into subfiles

The files are separated based on the pokenav resources substruct
ID they use.

4 files changed, 2257 insertions, 2240 deletions

diff --git a/src/pokenav.c b/src/pokenav.c
index 6299d2647..b70d66599 100644
--- a/src/pokenav.c
+++ b/src/pokenav.c
@@ -18,6 +18,7 @@
 #include "decompress.h"
 #include "strings.h"
 #include "constants/rgb.h"
+#include "pokenav.h"
 
 enum
 {
@@ -37,39 +38,6 @@ enum
     NAVMENU_CB_UNK_6
 };
 
-enum
-{
-    NAVGEAR_GFX_MAIN_MENU,
-    NAVGEAR_GFX_CONDITION_MENU,
-    NAVGEAR_GFX_RIBBONS_MENU,
-    NAVGEAR_GFX_MATCH_CALL_MENU,
-    
-    // One of these is for the zoomed-in map, and the other is for the
-    // zoomed-out map. Don't know which is which yet.
-    NAVGEAR_GFX_MAP_MENU_UNK0,
-    NAVGEAR_GFX_MAP_MENU_UNK1,
-
-    NAVGEAR_GFX_PARTY_MENU,
-    NAVGEAR_GFX_SEARCH_MENU,
-    NAVGEAR_GFX_COOL_MENU,
-    NAVGEAR_GFX_BEAUTY_MENU,
-    NAVGEAR_GFX_CUTE_MENU,
-    NAVGEAR_GFX_SMART_MENU,
-    NAVGEAR_GFX_TOUGH_MENU,
-
-    NAVGEAR_GFX_MENUS_END
-};
-
-#define NAVGEAR_GFX_SUBMENUS_START NAVGEAR_GFX_PARTY_MENU
-
-// Return values of LoopedTask functions.
-#define LT_INC_AND_PAUSE 0
-#define LT_INC_AND_CONTINUE 1
-#define LT_PAUSE 2
-#define LT_CONTINUE 3
-#define LT_FINISH 4
-#define LT_SET_STATE(newState) (newState + 5)
-
 #define LOOPED_TASK_DECODE_STATE(action) (action - 5)
 
 #define LOOPED_TASK_ID(primary, secondary) (((secondary) << 16) |(primary))
@@ -78,80 +46,6 @@ enum
 
 #define UNKNOWN_OFFSET 100000
 
-typedef u32 (*LoopedTask)(s32 state);
-
-struct UnknownSubSubStruct_0203CF40 {
-    u8 bg;
-    u8 unk1;
-    u8 unk2;
-    u8 unk3;
-    u8 unk4;
-    u8 fontId;
-    u16 unk6;
-    u16 windowId;
-    u16 unkA;
-    u16 unkC;
-    u16 unkE;
-};
-
-struct MatchCallWindowState {
-    // The index of the element at the top of the window.
-    u16 windowTopIndex;
-    u16 listLength;
-    u16 unk4;
-    // The index of the cursor, relative to the top of the window.
-    u16 selectedIndexOffset;
-    u16 visibleEntries;
-    u16 unkA;
-    u32 unkC;
-    u32 unk10;
-};
-
-// Generally at index 0.
-struct PokenavMainMenuResources
-{
-    void (*unk0)(u32);
-    u32 (*unk4)(void);
-    u32 unk8;
-    u32 currentTaskId;
-    u32 unk10;
-    u32 unk14;
-    struct Sprite *spinningNavgear;
-    struct Sprite *leftHeaderSprites[2];
-    struct Sprite *submenuLeftHeaderSprites[2];
-    u8 tilemapBuffer[0x800];
-};
-
-struct UnknownInnerStruct_81C81D4
-{
-    struct UnknownSubSubStruct_0203CF40 unk0;
-    u32 unk10;
-    u32 unk14;
-    u32 unk18;
-    u32 unk1C;
-    s32 unk20;
-    s32 unk24;
-    u32 unk28;
-    s32 unk2C;
-    u32 unk30;
-    void (*unk34)(u32, u8*);
-    void (*unk38)(u16, u32, u32);
-    struct Sprite *rightArrow;
-    struct Sprite *upArrow;
-    struct Sprite *downArrow;
-    u8 unkTextBuffer[0x40];
-};
-
-// Generally at index 0x11 (17)
-struct UnknownSubStruct_81C81D4
-{
-    struct UnknownInnerStruct_81C81D4 unk0;
-    u8 tilemapBuffer[0x800];
-    struct MatchCallWindowState unk888;
-    u32 unk89C;
-    u32 unk8A0;
-};
-
 #define SUBSTRUCT_COUNT 19
 
 struct PokenavResources
@@ -164,34 +58,7 @@ struct PokenavResources
     void *field10[SUBSTRUCT_COUNT];
 };
 
-// This struct uses a 32bit tag, and doesn't have a size field.
-// Needed to match LoadLeftHeaderGfxForSubMenu.
-struct CompressedSpriteSheetNoSize
-{
-    const u32 *data;  // LZ77 compressed palette data
-    u32 tag;
-};
-
-struct MatchCallListTemplate
-{
-    u32 unk0;
-    u16 unk4;
-    u16 unk6;
-    u8 unk8;
-    u8 unk9;
-    u8 unkA;
-    u8 unkB;
-    u8 unkC;
-    u8 unkD;
-    u8 unkE;
-    void (*unk10)(u32, u8 *a1);
-    void (*unk14)(u16 a0, u32 a1, u32 a2);
-};
-
 extern u32 sub_81C9430(void);
-extern void sub_81CAADC(void);
-extern u32 sub_81C99D4(void);
-extern void InitHoenMapHeaderSprites(void);
 extern u32 sub_81C9298(void);
 extern u32 sub_81C941C(void);
 extern u32 sub_81C9924(void);
@@ -249,38 +116,7 @@ extern u32 sub_81D04B8(void);
 extern u32 sub_81D09F4(void);
 extern u32 sub_81CFA04(void);
 extern u32 sub_81CFE08(void);
-extern void SpriteCB_SpinningNavgear(struct Sprite* sprite);
-extern void sub_81CBD48(u16 windowId, u32 a1);
-extern u8 *sub_81CAFD8(u16 a0, u32 a1);
-extern void sub_81DB620(u32 windowId, u32 a1, u32 a2, u32 a3, u32 a4);
 
-u32 sub_81C91AC(struct UnknownInnerStruct_81C81D4 *a0, const struct BgTemplate *a1, struct MatchCallListTemplate *a2, s32 a3);
-void sub_81C9160(struct MatchCallWindowState *a0, struct MatchCallListTemplate *a1);
-void SpriteCB_MatchCallUpArrow(struct Sprite *sprite);
-void SpriteCB_MatchCallDownArrow(struct Sprite *sprite);
-void SpriteCB_MatchCallRightArrow(struct Sprite *sprite);
-void ToggleMatchCallArrows(struct UnknownInnerStruct_81C81D4 *a0, u32 a1);
-void sub_81C8FE0(struct UnknownInnerStruct_81C81D4 *a0);
-void sub_81C8EF8(struct MatchCallWindowState *a0, struct UnknownInnerStruct_81C81D4 *a1);
-void sub_81C8ED0(void);
-void sub_81C8E54(struct MatchCallWindowState *a0, struct UnknownInnerStruct_81C81D4 *a1, u32 a2);
-void PrintMatchCallFieldNames(struct UnknownInnerStruct_81C81D4 *a0, u32 a1);
-void sub_81C8D4C(struct MatchCallWindowState *a0, struct UnknownInnerStruct_81C81D4 *a1);
-void sub_81C8CB4(struct MatchCallWindowState *a0, struct UnknownInnerStruct_81C81D4 *a1);
-void sub_81C8B70(struct UnknownSubSubStruct_0203CF40 *a0, u32 a1, u32 a2);
-u32 LoopedTask_sub_81C8A28(s32 a0);
-u32 LoopedTask_sub_81C8958(s32 a0);
-u32 LoopedTask_sub_81C8870(s32 a0);
-u32 LoopedTask_sub_81C85A0(s32 a0);
-void sub_81C8568(s32 a0, struct UnknownInnerStruct_81C81D4 *a1);
-u32 LoopedTask_sub_81C83F0(s32 a0);
-bool32 sub_81C83E0(void);
-void sub_81C83AC(u32 a0, u32 a1, u32 a2, u32 a3, u32 a4, struct UnknownInnerStruct_81C81D4 *a5);
-void sub_81C837C(struct MatchCallWindowState *a0, struct UnknownInnerStruct_81C81D4 *a1);
-void sub_81C835C(struct UnknownSubSubStruct_0203CF40 *a0);
-void sub_81C82E4(struct UnknownSubStruct_81C81D4 *a0);
-u32 LoopedTask_sub_81C8254(s32 a0);
-u32 LoopedTask_ScrollMenuHeaderUp(s32 a0);
 bool32 SetActivePokenavMenu(u32 a0);
 bool32 InitPokenavMainMenu(void);
 static bool32 AnyMonHasRibbon(void);
@@ -288,15 +124,10 @@ u32 sub_81C75E0(void);
 u32 sub_81C75D4(void);
 u32 PokenavMainMenuLoopedTaskIsActive(void);
 u32 sub_81C786C(void);
-u32 LoopedTask_InitPokenavMenu(s32 a0);
-u32 LoopedTask_ScrollMenuHeaderDown(s32 a0);
 bool32 WaitForPokenavShutdownFade(void);
-void CopyPaletteIntoBufferUnfaded(const u16 *palette, u32 a1, u32 a2);
 void sub_81C7834(void *func1, void *func2);
 static void InitPokenavResources(struct PokenavResources *a0);
-void FreePokenavSubstruct(u32 index);
 void sub_81C7850(u32 a0);
-void sub_81C7BF8(u32 a0);
 void Task_RunLoopedTask_LinkMode(u8 a0);
 void Task_RunLoopedTask(u8 taskId);
 void sub_81C742C(u8 taskId);
@@ -305,18 +136,7 @@ static void InitKeys_(void);
 static void FreePokenavResources(void);
 static void VBlankCB_Pokenav(void);
 static void CB2_Pokenav(void);
-void InitPokenavMainMenuResources(void);
 void sub_81C72BC(void);
-void sub_81C7B74(void);
-void CleanupPokenavMainMenuResources(void);
-void LoadLeftHeaderGfxForSubMenu(u32 arg0);
-void LoadLeftHeaderGfxForMenu(u32 arg0);
-void HideLeftHeaderSubmenuSprites(bool32 arg0);
-void HideLeftHeaderSprites(bool32 arg0);
-void ShowLeftHeaderSprites(u32 arg0, bool32 arg1);
-void ShowLeftHeaderSubmenuSprites(u32 arg0, bool32 arg1);
-void MoveLeftHeader(struct Sprite *sprite, s32 arg1, s32 arg2, s32 arg3);
-void SpriteCB_MoveLeftHeader(struct Sprite *sprite);
 
 // Const rom data.
 u32 (*const PokenavMenuCallbacks[15][7])(void) =
@@ -458,355 +278,9 @@ u32 (*const PokenavMenuCallbacks[15][7])(void) =
     },
 };
 
-const u16 gSpinningNavgearPaletteData[] = INCBIN_U16("graphics/pokenav/icon2.gbapal");
-const u32 gSpinningNavgearGfx[] = INCBIN_U32("graphics/pokenav/icon2.4bpp.lz");
-const u32 gUnused_SpinningNavgearGfx2[] = INCBIN_U32("graphics/pokenav/icon2_unused.4bpp.lz");
-
-const struct BgTemplate gPokenavMainMenuBgTemplates[] =
-{
-    {
-        .bg = 0,
-        .charBaseIndex = 0,
-        .mapBaseIndex = 5,
-        .screenSize = 0,
-        .paletteMode = 0,
-        .priority = 0,
-        .baseTile = 0,
-    }
-};
-
-const struct WindowTemplate gUnknown_0861FA08[2] =
-{
-    {
-        .bg = 0,
-        .tilemapLeft = 1,
-        .tilemapTop = 22,
-        .width = 16,
-        .height = 2,
-        .paletteNum = 0,
-        .baseBlock = 0x36,
-    },
-    {
-        .bg = 0xFF,
-        .tilemapLeft = 0,
-        .tilemapTop = 0,
-        .width = 0,
-        .height = 0,
-        .paletteNum = 0,
-        .baseBlock = 0,
-    },
-};
-
-const u8 *const (sMenuButtonReminders[12]) =
-{
-    gText_Navgear_ClearButtonList,
-    gText_NavgearMap_ZoomedOutButtons,
-    gText_NavgearMap_ZoomedInButtons,
-    gText_NavgearCondition_MonListButtons,
-    gText_NavgearCondition_MonStatusButtons,
-    gText_NavgearCondition_MarkingButtons,
-    gText_NavgearMatchCall_TrainerListButtons,
-    gText_NavgearMatchCall_CallMenuButtons,
-    gText_NavgearMatchCall_CheckTrainerButtons,
-    gText_NavgearRibbons_MonListButtons,
-    gText_NavgearRibbons_RibbonListButtons,
-    gText_NavgearRibbons_RibbonCheckButtons,
-};
-
-const u8 gMenuButtonReminderColor[4] =
-{
-    4, 1, 2, 0
-};
-
-static const struct CompressedSpriteSheet gSpinningNavgearSpriteSheet[] =
-{
-    {
-        .data = gSpinningNavgearGfx,
-        .size = 0x1000,
-        .tag = 0,
-    }
-};
-
-static const struct SpritePalette gSpinningNavgearPalette[] =
-{
-    {
-        .data = gSpinningNavgearPaletteData,
-        .tag = 0,
-    },
-    {}
-};
-
-static const struct CompressedSpriteSheet sPokenavHoenMapLeftHeaderSpriteSheet =
-{
-    .data = gPokenavLeftHeaderHoennMap_Gfx,
-    .size = 0xC00,
-    .tag = 2
-};
-
-static const struct CompressedSpriteSheet sPokenavMenuLeftHeaderSpriteSheets[] =
-{
-    [NAVGEAR_GFX_MAIN_MENU] = {
-        .data = gPokenavLeftHeaderMainMenu_Gfx,
-        .size = 0x20,
-        .tag = 3
-    },
-    [NAVGEAR_GFX_CONDITION_MENU] = {
-        .data = gPokenavLeftHeaderCondition_Gfx,
-        .size = 0x20,
-        .tag = 1
-    },
-    [NAVGEAR_GFX_RIBBONS_MENU] = {
-        .data = gPokenavLeftHeaderRibbons_Gfx,
-        .size = 0x20,
-        .tag = 2
-    },
-    [NAVGEAR_GFX_MATCH_CALL_MENU] = {
-        .data = gPokenavLeftHeaderMatchCall_Gfx,
-        .size = 0x20,
-        .tag = 4
-    },
-    [NAVGEAR_GFX_MAP_MENU_UNK0] = {
-        .data = gPokenavLeftHeaderHoennMap_Gfx,
-        .size = 0x20,
-        .tag = 0
-    },
-    [NAVGEAR_GFX_MAP_MENU_UNK1] = {
-        .data = gPokenavLeftHeaderHoennMap_Gfx,
-        .size = 0x40,
-        .tag = 0
-    }
-};
-
-static const struct CompressedSpriteSheetNoSize sPokenavSubMenuLeftHeaderSpriteSheets[] =
-{
-    [NAVGEAR_GFX_PARTY_MENU - NAVGEAR_GFX_SUBMENUS_START] = {
-        .data = gPokenavLeftHeaderParty_Gfx,
-        .tag = 1
-    },
-    [NAVGEAR_GFX_SEARCH_MENU - NAVGEAR_GFX_SUBMENUS_START] = {
-        .data = gPokenavLeftHeaderSearch_Gfx,
-        .tag = 1
-    },
-    [NAVGEAR_GFX_COOL_MENU - NAVGEAR_GFX_SUBMENUS_START] = {
-        .data = gPokenavLeftHeaderCool_Gfx,
-        .tag = 4
-    },
-    [NAVGEAR_GFX_BEAUTY_MENU - NAVGEAR_GFX_SUBMENUS_START] = {
-        .data = gPokenavLeftHeaderBeauty_Gfx,
-        .tag = 1
-    },
-    [NAVGEAR_GFX_CUTE_MENU - NAVGEAR_GFX_SUBMENUS_START] = {
-        .data = gPokenavLeftHeaderCute_Gfx,
-        .tag = 2
-    },
-    [NAVGEAR_GFX_SMART_MENU - NAVGEAR_GFX_SUBMENUS_START] = {
-        .data = gPokenavLeftHeaderSmart_Gfx,
-        .tag = 0
-    },
-    [NAVGEAR_GFX_TOUGH_MENU - NAVGEAR_GFX_SUBMENUS_START] = {
-        .data = gPokenavLeftHeaderTough_Gfx,
-        .tag = 0
-    }
-};
-
-static const struct OamData sSpinningNavgearSpriteOam =
-{
-    .y = 0,
-    .affineMode = 0,
-    .objMode = 0,
-    .mosaic = 0,
-    .bpp = 0,
-    .shape = 0, // FIXME: Use SPRITE_SHAPE
-    .x = 0,
-    .matrixNum = 0,
-    .size = 2, // FIXME: Use SPRITE_SIZE
-    .tileNum = 0,
-    .priority = 0,
-    .paletteNum = 0,
-    .affineParam = 0
-};
-
-static const union AnimCmd sSpinningNavgearAnims[] =
-{
-    ANIMCMD_FRAME(0, 8),
-    ANIMCMD_FRAME(16, 8),
-    ANIMCMD_FRAME(32, 8),
-    ANIMCMD_FRAME(48, 8),
-    ANIMCMD_FRAME(64, 8),
-    ANIMCMD_FRAME(80, 8),
-    ANIMCMD_FRAME(96, 8),
-    ANIMCMD_FRAME(112, 8),
-    ANIMCMD_JUMP(0)
-};
-
-static const union AnimCmd *const sSpinningNavgearAnimTable[] =
-{
-    sSpinningNavgearAnims
-};
-
-static const struct SpriteTemplate sSpinningNavgearSpriteTemplate =
-{
-    .tileTag = 0,
-    .paletteTag = 0,
-    .oam = &sSpinningNavgearSpriteOam,
-    .anims = sSpinningNavgearAnimTable,
-    .images = NULL,
-    .affineAnims = gDummySpriteAffineAnimTable,
-    .callback = SpriteCB_SpinningNavgear
-};
-
-static const struct OamData sPokenavLeftHeaderHoenMapSpriteOam =
-{
-    .y = 0,
-    .affineMode = 0,
-    .objMode = 0,
-    .mosaic = 0,
-    .bpp = 0,
-    .shape = 1,
-    .x = 0,
-    .matrixNum = 0,
-    .size = 3,
-    .tileNum = 0,
-    .priority = 1,
-    .paletteNum = 0,
-    .affineParam = 0
-};
-
-static const struct OamData sUnknown_0861FB24 =
-{
-    .y = 0,
-    .affineMode = 0,
-    .objMode = 0,
-    .mosaic = 0,
-    .bpp = 0,
-    .shape = 1,
-    .x = 0,
-    .matrixNum = 0,
-    .size = 2,
-    .tileNum = 0,
-    .priority = 1,
-    .paletteNum = 0,
-    .affineParam = 0
-};
-
-static const struct SpriteTemplate sPokenavLeftHeaderHoenMapSpriteTemplate =
-{
-    .tileTag = 2,
-    .paletteTag = 1,
-    .oam = &sPokenavLeftHeaderHoenMapSpriteOam,
-    .anims = gDummySpriteAnimTable,
-    .images = NULL,
-    .affineAnims = gDummySpriteAffineAnimTable,
-    .callback = SpriteCallbackDummy
-};
-
-static const struct SpriteTemplate sUnknown_0861FB44 =
-{
-    .tileTag = 2,
-    .paletteTag = 2,
-    .oam = &sUnknown_0861FB24,
-    .anims = gDummySpriteAnimTable,
-    .images = NULL,
-    .affineAnims = gDummySpriteAffineAnimTable,
-    .callback = SpriteCallbackDummy
-};
-
-static const u16 sMatchcallArrowPaletteData[] = INCBIN_U16("graphics/pokenav/arrows_matchcall.gbapal");
-static const u32 sMatchcallArrowSpriteSheetData[] = INCBIN_U32("graphics/pokenav/arrows_matchcall.4bpp.lz");
-
-static const u8 sPokenavColors_0861FBE4[] =
-{
-    0, 2, 5
-};
-
-static const u8 *const sMatchCallFieldNames[] =
-{
-    gText_NavgearMatchCall_Strategy,
-    gText_NavgearMatchCall_TrainerPokemon,
-    gText_NavgearMatchCall_SelfIntroduction
-};
-
-static const u8 sMatchCallFieldColors[] =
-{
-    1, 4, 5
-};
-
-static const u8 sUnknown_0861FBF7[] =
-{
-    2, 4, 6, 7, 0
-};
-
-static const struct CompressedSpriteSheet sMatchcallArrowSpriteSheet[] =
-{
-    {
-        .data = sMatchcallArrowSpriteSheetData,
-        .size = 192,
-        .tag = 0xA
-    }
-};
-
-static const struct SpritePalette sMatchcallArrowPalette[] =
-{
-    {
-        .data = sMatchcallArrowPaletteData,
-        .tag = 0x14
-    },
-    {}
-};
-
-static const struct OamData sMatchCallRightArrowSpriteOam =
-{
-    .y = 0,
-    .affineMode = ST_OAM_AFFINE_OFF,
-    .objMode = ST_OAM_OBJ_NORMAL,
-    .bpp = ST_OAM_4BPP,
-    .shape = 2, //SPRITE_SHAPE(16x8),
-    .x = 0,
-    .size = 0, //SPRITE_SIZE(16x8),
-    .tileNum = 0,
-    .priority = 2,
-    .paletteNum = 0
-};
-
-static const struct SpriteTemplate sMatchCallRightArrowSprite =
-{
-    .tileTag = 0xA,
-    .paletteTag = 0x14,
-    .oam = &sMatchCallRightArrowSpriteOam,
-    .anims = gDummySpriteAnimTable,
-    .images = NULL,
-    .affineAnims = gDummySpriteAffineAnimTable,
-    .callback = SpriteCB_MatchCallRightArrow
-};
-
-static const struct OamData sMatchCallUpDownArrowSpriteOam =
-{
-    .y = 0,
-    .affineMode = ST_OAM_AFFINE_OFF,
-    .objMode = ST_OAM_OBJ_NORMAL,
-    .bpp = ST_OAM_4BPP,
-    .shape = 1, //SPRITE_SHAPE(8x16),
-    .x = 0,
-    .size = 0, //SPRITE_SIZE(8x16),
-    .tileNum = 0,
-    .priority = 2,
-    .paletteNum = 0
-};
-
-static const struct SpriteTemplate sMatchCallUpDownArrowSprite =
-{
-    .tileTag = 0xA,
-    .paletteTag = 0x14,
-    .oam = &sMatchCallUpDownArrowSpriteOam,
-    .anims = gDummySpriteAnimTable,
-    .images = NULL,
-    .affineAnims = gDummySpriteAffineAnimTable,
-    .callback = SpriteCallbackDummy
-};
 
 EWRAM_DATA u8 gNextLoopedTaskId = 0;
 EWRAM_DATA struct PokenavResources *gPokenavResources = NULL;
-EWRAM_DATA u32 gUnknown_0203CF44 = 0;
 
 // code
 u32 CreateLoopedTask(LoopedTask loopedTask, u32 priority)
@@ -1186,1716 +660,3 @@ bool32 CanViewRibbonsMenu(void)
 {
     return gPokenavResources->hasAnyRibbons;
 }
-
-bool32 InitPokenavMainMenu(void)
-{
-    struct PokenavMainMenuResources *structPtr;
-    
-    structPtr = AllocSubstruct(0, sizeof(struct PokenavMainMenuResources));
-    if (structPtr == NULL)
-        return FALSE;
-
-    ResetSpriteData();
-    FreeAllSpritePalettes();
-    structPtr->currentTaskId = CreateLoopedTask(LoopedTask_InitPokenavMenu, 1);
-    return TRUE;
-}
-
-u32 PokenavMainMenuLoopedTaskIsActive(void)
-{
-    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
-    return IsLoopedTaskActive(structPtr->currentTaskId);
-}
-
-void ShutdownPokenav(void)
-{
-    PlaySE(SE_PN_OFF);
-    sub_81CAADC();
-    BeginNormalPaletteFade(0xFFFFFFFF, -1, 0, 16, RGB_BLACK);
-}
-
-bool32 WaitForPokenavShutdownFade(void)
-{
-    if (!gPaletteFade.active)
-    {
-        sub_81C99D4();
-        CleanupPokenavMainMenuResources();
-        FreeAllWindowBuffers();
-        return FALSE;
-    }
-
-    return TRUE;
-}
-
-u32 LoopedTask_InitPokenavMenu(s32 a0)
-{
-    struct PokenavMainMenuResources *structPtr;
-
-    switch (a0)
-    {
-    case 0:
-        SetGpuReg(REG_OFFSET_DISPCNT, DISPCNT_OBJ_ON | DISPCNT_OBJ_1D_MAP);
-        FreeAllWindowBuffers();
-        ResetBgsAndClearDma3BusyFlags(0);
-        InitBgsFromTemplates(0, gPokenavMainMenuBgTemplates, ARRAY_COUNT(gPokenavMainMenuBgTemplates));
-        ResetBgPositions();
-        reset_temp_tile_data_buffers();
-        return LT_INC_AND_CONTINUE;
-    case 1:
-        structPtr = GetSubstructPtr(0);
-        decompress_and_copy_tile_data_to_vram(0, &gPokenavHeader_Gfx, 0, 0, 0);
-        SetBgTilemapBuffer(0, structPtr->tilemapBuffer);
-        CopyToBgTilemapBuffer(0, &gPokenavHeader_Tilemap, 0, 0);
-        CopyPaletteIntoBufferUnfaded(gPokenavHeader_Pal, 0, 0x20);
-        CopyBgTilemapBufferToVram(0);
-        return LT_INC_AND_PAUSE;
-    case 2:
-        if (free_temp_tile_data_buffers_if_possible())
-            return LT_PAUSE;
-
-        sub_81C7B74();
-        return LT_INC_AND_PAUSE;
-    case 3:
-        if (IsDma3ManagerBusyWithBgCopy())
-            return LT_PAUSE;
-
-        InitPokenavMainMenuResources();
-        InitHoenMapHeaderSprites();
-        ShowBg(0);
-        return LT_FINISH;
-    default:
-        return LT_FINISH;
-    }
-}
-
-void sub_81C7834(void *func1, void *func2) // Fix types later.
-{
-    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
-    structPtr->unk0 = func1;
-    structPtr->unk4 = func2;
-    structPtr->unk8 = 0;
-}
-
-void sub_81C7850(u32 a0)
-{
-    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
-    structPtr->unk8 = 0;
-    structPtr->unk0(a0);
-}
-
-u32 sub_81C786C(void)
-{
-    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
-    return structPtr->unk4();
-}
-
-void sub_81C7880(void)
-{
-    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
-    structPtr->currentTaskId = CreateLoopedTask(LoopedTask_ScrollMenuHeaderDown, 4);
-}
-
-void sub_81C78A0(void)
-{
-    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
-    structPtr->currentTaskId = CreateLoopedTask(LoopedTask_ScrollMenuHeaderUp, 4);
-}
-
-bool32 MainMenuLoopedTaskIsBusy(void)
-{
-    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
-    return IsLoopedTaskActive(structPtr->currentTaskId);
-}
-
-u32 LoopedTask_ScrollMenuHeaderDown(s32 a0)
-{
-    switch (a0)
-    {
-    default:
-        return LT_FINISH;
-    case 1:
-        return LT_INC_AND_PAUSE;
-    case 0:
-        return LT_INC_AND_PAUSE;
-    case 2:
-        if (ChangeBgY(0, 384, 1) >= 0x2000u)
-        {
-            ChangeBgY(0, 0x2000, 0);
-            return LT_FINISH;
-        }
-
-        return LT_PAUSE;
-    }
-}
-
-u32 LoopedTask_ScrollMenuHeaderUp(s32 a0)
-{
-    if (ChangeBgY(0, 384, 2) <= 0)
-    {
-        ChangeBgY(0, 0, 0);
-        return 4;
-    }
-    return 2;
-}
-
-void CopyPaletteIntoBufferUnfaded(const u16 *palette, u32 bufferOffset, u32 size)
-{
-    CpuCopy16(palette, gPlttBufferUnfaded + bufferOffset, size);
-}
-
-void Pokenav_AllocAndLoadPalettes(const struct SpritePalette *palettes)
-{
-    const struct SpritePalette *current;
-    u32 index;
-
-    for (current = palettes; current->data != NULL; current++)
-    {
-        index = AllocSpritePalette(current->tag);
-        if (index == 0xFF)
-        {
-            break;
-        }
-        else
-        {
-            index = (index * 16) + 0x100;
-            CopyPaletteIntoBufferUnfaded(current->data, index, 0x20);
-        }
-    }
-}
-
-void sub_81C7990(u32 a0, u16 a1)
-{
-    CpuFill16(a1, gPlttBufferFaded + 0x100 + (a0 * 16), 16 * sizeof(u16));
-}
-
-__attribute__((naked))
-void sub_81C79BC(u16 *a0, u16 *a1, u32 a2, u32 a3, u32 a4, u32 a5)
-{
-    asm(".syntax unified\n\
-    push {r4-r7,lr}\n\
-    mov r7, r10\n\
-    mov r6, r9\n\
-    mov r5, r8\n\
-    push {r5-r7}\n\
-    sub sp, 0xC\n\
-    str r0, [sp]\n\
-    str r1, [sp, 0x4]\n\
-    mov r10, r2\n\
-    str r3, [sp, 0x8]\n\
-    ldr r0, [sp, 0x2C]\n\
-    cmp r0, 0\n\
-    bne _081C79E4\n\
-    ldr r2, =0x001fffff\n\
-    mov r1, r10\n\
-    ands r2, r1\n\
-    ldr r0, [sp]\n\
-    b _081C79F4\n\
-    .pool\n\
-_081C79E4:\n\
-    ldr r2, [sp, 0x2C]\n\
-    ldr r0, [sp, 0x8]\n\
-    cmp r2, r0\n\
-    blt _081C7A00\n\
-    ldr r2, =0x001fffff\n\
-    mov r1, r10\n\
-    ands r2, r1\n\
-    ldr r0, [sp, 0x4]\n\
-_081C79F4:\n\
-    ldr r1, [sp, 0x30]\n\
-    bl CpuSet\n\
-    b _081C7AAE\n\
-    .pool\n\
-_081C7A00:\n\
-    movs r2, 0x1\n\
-    negs r2, r2\n\
-    add r10, r2\n\
-    b _081C7AA6\n\
-_081C7A08:\n\
-    ldr r1, [sp]\n\
-    ldrh r0, [r1]\n\
-    movs r2, 0x1F\n\
-    mov r9, r2\n\
-    mov r1, r9\n\
-    ands r1, r0\n\
-    mov r9, r1\n\
-    lsls r0, 16\n\
-    lsrs r2, r0, 21\n\
-    movs r1, 0x1F\n\
-    ands r1, r2\n\
-    mov r8, r1\n\
-    lsrs r7, r0, 26\n\
-    movs r2, 0x1F\n\
-    ands r7, r2\n\
-    ldr r0, [sp, 0x4]\n\
-    ldrh r4, [r0]\n\
-    movs r0, 0x1F\n\
-    ands r0, r4\n\
-    mov r1, r9\n\
-    subs r0, r1\n\
-    lsls r0, 8\n\
-    ldr r1, [sp, 0x8]\n\
-    bl __divsi3\n\
-    ldr r2, [sp, 0x2C]\n\
-    adds r6, r0, 0\n\
-    muls r6, r2\n\
-    asrs r6, 8\n\
-    lsls r4, 16\n\
-    lsrs r0, r4, 21\n\
-    movs r1, 0x1F\n\
-    ands r0, r1\n\
-    mov r2, r8\n\
-    subs r0, r2\n\
-    lsls r0, 8\n\
-    ldr r1, [sp, 0x8]\n\
-    bl __divsi3\n\
-    ldr r1, [sp, 0x2C]\n\
-    adds r5, r0, 0\n\
-    muls r5, r1\n\
-    asrs r5, 8\n\
-    lsrs r4, 26\n\
-    movs r2, 0x1F\n\
-    ands r4, r2\n\
-    subs r4, r7\n\
-    lsls r4, 8\n\
-    adds r0, r4, 0\n\
-    ldr r1, [sp, 0x8]\n\
-    bl __divsi3\n\
-    ldr r1, [sp, 0x2C]\n\
-    muls r0, r1\n\
-    asrs r0, 8\n\
-    add r6, r9\n\
-    movs r2, 0x1F\n\
-    ands r6, r2\n\
-    add r5, r8\n\
-    ands r5, r2\n\
-    adds r0, r7, r0\n\
-    ands r0, r2\n\
-    lsls r0, 10\n\
-    lsls r5, 5\n\
-    orrs r0, r5\n\
-    orrs r0, r6\n\
-    ldr r1, [sp, 0x30]\n\
-    strh r0, [r1]\n\
-    ldr r2, [sp]\n\
-    adds r2, 0x2\n\
-    str r2, [sp]\n\
-    ldr r0, [sp, 0x4]\n\
-    adds r0, 0x2\n\
-    str r0, [sp, 0x4]\n\
-    adds r1, 0x2\n\
-    str r1, [sp, 0x30]\n\
-    movs r1, 0x1\n\
-    negs r1, r1\n\
-    add r10, r1\n\
-_081C7AA6:\n\
-    movs r0, 0x1\n\
-    negs r0, r0\n\
-    cmp r10, r0\n\
-    bne _081C7A08\n\
-_081C7AAE:\n\
-    add sp, 0xC\n\
-    pop {r3-r5}\n\
-    mov r8, r3\n\
-    mov r9, r4\n\
-    mov r10, r5\n\
-    pop {r4-r7}\n\
-    pop {r0}\n\
-    bx r0\n\
-    .syntax divided");
-}
-
-void sub_81C7AC0(s32 a0)
-{
-    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
-
-    switch (a0)
-    {
-    case 0:
-        BeginNormalPaletteFade(structPtr->unk14, -2, 0, 16, RGB_BLACK);
-        break;
-    case 1:
-        BeginNormalPaletteFade(structPtr->unk14, -2, 16, 0, RGB_BLACK);
-        break;
-    case 2:
-        BeginNormalPaletteFade(0xFFFFFFFF, -2, 0, 16, RGB_BLACK);
-        break;
-    case 3:
-        BeginNormalPaletteFade(0xFFFFFFFF, -2, 16, 0, RGB_BLACK);
-        break;
-    }
-}
-
-bool32 IsPaletteFadeActive(void)
-{
-    return gPaletteFade.active;
-}
-
-void sub_81C7B40(void)
-{
-    BlendPalettes(0xFFFEFFFE, 16, RGB_BLACK);
-}
-
-void InitBgTemplates(const struct BgTemplate *templates, s32 count)
-{
-    s32 i;
-
-    for (i = 0; i < count; i++)
-        InitBgFromTemplate(templates++);
-}
-
-void sub_81C7B74(void)
-{
-    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
-
-    InitWindows(&gUnknown_0861FA08[0]);
-    structPtr->unk10 = 0;
-    sub_81C7BF8(structPtr->unk10);
-    PutWindowTilemap(structPtr->unk10);
-    CopyWindowToVram(structPtr->unk10, 3); // TODO: Use a defined constant here.
-}
-
-void sub_81C7BA4(u32 a0)
-{
-    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
-
-    sub_81C7BF8(structPtr->unk10);
-    AddTextPrinterParameterized3(structPtr->unk10, 1, 0, 1, gMenuButtonReminderColor, 0, sMenuButtonReminders[a0]);
-}
-
-bool32 IsDma3ManagerBusyWithBgCopy_(void)
-{
-    return IsDma3ManagerBusyWithBgCopy();
-}
-
-void sub_81C7BF8(u32 windowId)
-{
-    FillWindowPixelBuffer(windowId, PIXEL_FILL(4));
-    FillWindowPixelRect(windowId, PIXEL_FILL(5), 0, 0, 0x80, 1);
-}
-
-void InitPokenavMainMenuResources(void)
-{
-    s32 i;
-    u8 spriteId;
-    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
-
-    for (i = 0; i < ARRAY_COUNT(gSpinningNavgearSpriteSheet); i++)
-        LoadCompressedSpriteSheet(&gSpinningNavgearSpriteSheet[i]);
-
-    Pokenav_AllocAndLoadPalettes(gSpinningNavgearPalette);
-    structPtr->unk14 = ~1 & ~(0x10000 << IndexOfSpritePaletteTag(0));
-    spriteId = CreateSprite(&sSpinningNavgearSpriteTemplate, 220, 12, 0);
-    structPtr->spinningNavgear = &gSprites[spriteId];
-}
-
-void CleanupPokenavMainMenuResources(void)
-{
-    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
-
-    DestroySprite(structPtr->spinningNavgear);
-    FreeSpriteTilesByTag(0);
-    FreeSpritePaletteByTag(0);
-}
-
-void SpriteCB_SpinningNavgear(struct Sprite *sprite)
-{
-    // If the background starts scrolling, follow it.
-    sprite->pos2.y = (GetBgY(0) / 256u) * -1;
-}
-
-struct Sprite *PauseSpinningNavgearSprite(void)
-{
-    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
-
-    structPtr->spinningNavgear->callback = SpriteCallbackDummy;
-    return structPtr->spinningNavgear;
-}
-
-void ResumeSpinningNavgearSprite(void)
-{
-    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
-
-    structPtr->spinningNavgear->pos1.x = 220;
-    structPtr->spinningNavgear->pos1.y = 12;
-    structPtr->spinningNavgear->callback = SpriteCB_SpinningNavgear;
-    structPtr->spinningNavgear->invisible = FALSE;
-    structPtr->spinningNavgear->oam.priority = 0;
-    structPtr->spinningNavgear->subpriority = 0;
-}
-
-void InitHoenMapHeaderSprites(void)
-{
-    s32 i, spriteId;
-    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
-
-    LoadCompressedSpriteSheet(&sPokenavHoenMapLeftHeaderSpriteSheet);
-    AllocSpritePalette(1);
-    AllocSpritePalette(2);
-    for (i = 0; i < (s32)ARRAY_COUNT(structPtr->leftHeaderSprites); i++)
-    {
-        spriteId = CreateSprite(&sPokenavLeftHeaderHoenMapSpriteTemplate, 0, 0, 1);
-        structPtr->leftHeaderSprites[i] = &gSprites[spriteId];
-        structPtr->leftHeaderSprites[i]->invisible = TRUE;
-        structPtr->leftHeaderSprites[i]->pos2.x = i * 64;
-
-        spriteId = CreateSprite(&sUnknown_0861FB44, 0, 0, 2);
-        structPtr->submenuLeftHeaderSprites[i] = &gSprites[spriteId];
-        structPtr->submenuLeftHeaderSprites[i]->invisible = TRUE;
-        structPtr->submenuLeftHeaderSprites[i]->pos2.x = i * 32;
-        structPtr->submenuLeftHeaderSprites[i]->pos2.y = 18;
-        structPtr->submenuLeftHeaderSprites[i]->oam.tileNum += (i * 8) + 64;
-    }
-}
-
-void LoadLeftHeaderGfxForIndex(u32 arg0)
-{
-    if (arg0 < NAVGEAR_GFX_SUBMENUS_START)
-        LoadLeftHeaderGfxForMenu(arg0);
-    else
-        LoadLeftHeaderGfxForSubMenu(arg0 - NAVGEAR_GFX_SUBMENUS_START);
-}
-
-void sub_81C7E14(u32 arg0)
-{
-    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
-
-    if (arg0 == 4)
-        structPtr->leftHeaderSprites[1]->oam.tileNum = GetSpriteTileStartByTag(2) + 32;
-    else
-        structPtr->leftHeaderSprites[1]->oam.tileNum = GetSpriteTileStartByTag(2) + 64;
-}
-
-void LoadLeftHeaderGfxForMenu(u32 index)
-{
-    struct PokenavMainMenuResources *structPtr;
-    u32 size, tag;
-
-    if (index >= NAVGEAR_GFX_SUBMENUS_START)
-        return;
-
-    structPtr = GetSubstructPtr(0);
-    tag = sPokenavMenuLeftHeaderSpriteSheets[index].tag;
-    size = GetDecompressedDataSize(sPokenavMenuLeftHeaderSpriteSheets[index].data);
-    LoadPalette(&gPokenavLeftHeader_Pal[tag * 16], (IndexOfSpritePaletteTag(1) * 16) + 0x100, 0x20);
-    LZ77UnCompWram(sPokenavMenuLeftHeaderSpriteSheets[index].data, gDecompressionBuffer);
-    RequestDma3Copy(gDecompressionBuffer, (void *)VRAM + 0x10000 + (GetSpriteTileStartByTag(2) * 32), size, 1);
-    structPtr->leftHeaderSprites[1]->oam.tileNum = GetSpriteTileStartByTag(2) + sPokenavMenuLeftHeaderSpriteSheets[index].size;
-
-    if (index == NAVGEAR_GFX_MAP_MENU_UNK0 || index == NAVGEAR_GFX_MAP_MENU_UNK1)
-        structPtr->leftHeaderSprites[1]->pos2.x = 56;
-    else
-        structPtr->leftHeaderSprites[1]->pos2.x = 64;
-}
-
-void LoadLeftHeaderGfxForSubMenu(u32 arg0)
-{
-    u32 size, tag;
-
-    if (arg0 >= NAVGEAR_GFX_MENUS_END - NAVGEAR_GFX_SUBMENUS_START)
-        return;
-
-    tag = sPokenavSubMenuLeftHeaderSpriteSheets[arg0].tag;
-    size = GetDecompressedDataSize(sPokenavSubMenuLeftHeaderSpriteSheets[arg0].data);
-    LoadPalette(&gPokenavLeftHeader_Pal[tag * 16], (IndexOfSpritePaletteTag(2) * 16) + 0x100, 0x20);
-    LZ77UnCompWram(sPokenavSubMenuLeftHeaderSpriteSheets[arg0].data, &gDecompressionBuffer[0x1000]);
-    RequestDma3Copy(&gDecompressionBuffer[0x1000], (void *)VRAM + 0x10800 + (GetSpriteTileStartByTag(2) * 32), size, 1);
-}
-
-void sub_81C7FA0(u32 arg0, bool32 arg1, bool32 arg2)
-{
-    u32 var;
-
-    if (!arg1)
-        var = 0x30;
-    else
-        var = 0x10;
-
-    if (arg0 < 6)
-        ShowLeftHeaderSprites(var, arg2);
-    else
-        ShowLeftHeaderSubmenuSprites(var, arg2);
-}
-
-void sub_81C7FC4(u32 arg0, bool32 arg1)
-{
-    if (arg0 < 6)
-        HideLeftHeaderSprites(arg1);
-    else
-        HideLeftHeaderSubmenuSprites(arg1);
-}
-
-void sub_81C7FDC(void)
-{
-    s32 i;
-    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
-
-    for (i = 0; i < (s32)ARRAY_COUNT(structPtr->leftHeaderSprites); i++)
-    {
-        structPtr->leftHeaderSprites[i]->invisible = TRUE;
-        structPtr->submenuLeftHeaderSprites[i]->invisible = TRUE;
-    }
-}
-
-bool32 sub_81C8010(void)
-{
-    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
-
-    if (structPtr->leftHeaderSprites[0]->callback == SpriteCallbackDummy && structPtr->submenuLeftHeaderSprites[0]->callback == SpriteCallbackDummy)
-        return FALSE;
-    else
-        return TRUE;
-}
-
-void ShowLeftHeaderSprites(u32 startY, bool32 isOnRightSide)
-{
-    s32 start, end, i;
-    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
-
-    if (!isOnRightSide)
-        start = -96, end = 32;
-    else
-        start = 256, end = 160;
-
-    for (i = 0; i < (s32)ARRAY_COUNT(structPtr->leftHeaderSprites); i++)
-    {
-        structPtr->leftHeaderSprites[i]->pos1.y = startY;
-        MoveLeftHeader(structPtr->leftHeaderSprites[i], start, end, 12);
-    }
-}
-
-void ShowLeftHeaderSubmenuSprites(u32 startY, bool32 isOnRightSide)
-{
-    s32 start, end, i;
-    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
-
-    if (!isOnRightSide)
-        start = -96, end = 16;
-    else
-        start = 256, end = 192;
-
-    for (i = 0; i < (s32)ARRAY_COUNT(structPtr->submenuLeftHeaderSprites); i++)
-    {
-        structPtr->submenuLeftHeaderSprites[i]->pos1.y = startY;
-        MoveLeftHeader(structPtr->submenuLeftHeaderSprites[i], start, end, 12);
-    }
-}
-
-void HideLeftHeaderSprites(bool32 isOnRightSide)
-{
-    s32 start, end, i;
-    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
-
-    if (!isOnRightSide)
-        start = 32, end = -96;
-    else
-        start = 192, end = 256;
-
-    for (i = 0; i < (s32)ARRAY_COUNT(structPtr->leftHeaderSprites); i++)
-    {
-        MoveLeftHeader(structPtr->leftHeaderSprites[i], start, end, 12);
-    }
-}
-
-void HideLeftHeaderSubmenuSprites(bool32 isOnRightSide)
-{
-    s32 start, end, i;
-    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
-
-    if (!isOnRightSide)
-        start = 16, end = -96;
-    else
-        start = 192, end = 256;
-
-    for (i = 0; i < (s32)ARRAY_COUNT(structPtr->submenuLeftHeaderSprites); i++)
-    {
-        MoveLeftHeader(structPtr->submenuLeftHeaderSprites[i], start, end, 12);
-    }
-}
-
-void MoveLeftHeader(struct Sprite *sprite, s32 startX, s32 endX, s32 duration)
-{
-    sprite->pos1.x = startX;
-    sprite->data[0] = startX * 16;
-    sprite->data[1] = (endX - startX) * 16 / duration;
-    sprite->data[2] = duration;
-    sprite->data[7] = endX;
-    sprite->callback = SpriteCB_MoveLeftHeader;
-}
-
-void SpriteCB_MoveLeftHeader(struct Sprite *sprite)
-{
-    if (sprite->data[2] != 0)
-    {
-        sprite->data[2]--;
-        sprite->data[0] += sprite->data[1];
-        sprite->pos1.x = sprite->data[0] >> 4;
-        if (sprite->pos1.x < -16 || sprite->pos1.x > 256)
-            sprite->invisible = TRUE;
-        else
-            sprite->invisible = FALSE;
-    }
-    else
-    {
-        sprite->pos1.x = sprite->data[7];
-        sprite->callback = SpriteCallbackDummy;
-    }
-}
-
-bool32 sub_81C81D4(const struct BgTemplate *arg0, struct MatchCallListTemplate *arg1, s32 arg2)
-{
-    u32 v1;
-    struct UnknownSubStruct_81C81D4 *structPtr;
-    
-    structPtr = AllocSubstruct(0x11, sizeof(struct UnknownSubStruct_81C81D4));
-
-    if (structPtr == NULL)
-        return FALSE;
-    
-    sub_81C9160(&structPtr->unk888, arg1);
-
-    v1 = sub_81C91AC(&structPtr->unk0, arg0, arg1, arg2);
-    if (v1 == 0)
-        return FALSE;
-    
-    CreateLoopedTask(LoopedTask_sub_81C8254, 6);
-    return TRUE;
-}
-
-bool32 sub_81C8224(void)
-{
-    return FuncIsActiveLoopedTask(LoopedTask_sub_81C8254);
-}
-
-void sub_81C8234(void)
-{
-    struct UnknownSubStruct_81C81D4 *structPtr;
-
-    structPtr = GetSubstructPtr(0x11);
-    sub_81C8FE0(&structPtr->unk0);
-    RemoveWindow(structPtr->unk0.unk0.windowId);
-    FreePokenavSubstruct(0x11);
-}
-
-u32 LoopedTask_sub_81C8254(s32 a0)
-{
-    struct UnknownSubStruct_81C81D4 *structPtr;
-
-    if (IsDma3ManagerBusyWithBgCopy())
-        return 2;
-    
-    structPtr = GetSubstructPtr(0x11);
-
-    switch (a0)
-    {
-        case 0:
-            sub_81C82E4(structPtr);
-            return 0;
-        case 1:
-            sub_81C835C(&structPtr->unk0.unk0);
-            return 0;
-        case 2:
-            sub_81C837C(&structPtr->unk888, &structPtr->unk0);
-            return 0;
-        case 3:
-            if (sub_81C83E0())
-            {
-                return 2;
-            }
-            else
-            {
-                sub_81C8ED0();
-                return 1;
-            }
-        case 4:
-            sub_81C8EF8(&structPtr->unk888, &structPtr->unk0);
-            return 4;
-        default:
-            return 4;
-    }
-}
-
-void sub_81C82E4(struct UnknownSubStruct_81C81D4 *a0)
-{
-    u16 v1 = (a0->unk0.unk0.unk1 << 12) | a0->unk0.unk0.unk6;
-    // TODO: When #553 is merged, use a PALETTE_NUM_TO_FILL_VALUE(1) macro here...
-    sub_8199DF0(a0->unk0.unk0.bg, 0x11, a0->unk0.unk0.unk6, 1);
-    // ...and PALETTE_NUM_TO_FILL_VALUE(4) here.
-    sub_8199DF0(a0->unk0.unk0.bg, 0x44, a0->unk0.unk0.unk6 + 1, 1);
-    SetBgTilemapBuffer(a0->unk0.unk0.bg, a0->tilemapBuffer);
-    FillBgTilemapBufferRect_Palette0(a0->unk0.unk0.bg, v1, 0, 0, 32, 32);
-    ChangeBgY(a0->unk0.unk0.bg, 0, 0);
-    ChangeBgX(a0->unk0.unk0.bg, 0, 0);
-    ChangeBgY(a0->unk0.unk0.bg, a0->unk0.unk0.unk3 << 11, 2);
-    CopyBgTilemapBufferToVram(a0->unk0.unk0.bg);
-}
-
-void sub_81C835C(struct UnknownSubSubStruct_0203CF40 *a0)
-{
-    FillWindowPixelBuffer(a0->windowId, PIXEL_FILL(1));
-    PutWindowTilemap(a0->windowId);
-    CopyWindowToVram(a0->windowId, 1);
-}
-
-void sub_81C837C(struct MatchCallWindowState *a0, struct UnknownInnerStruct_81C81D4 *a1)
-{
-    s32 v1;
-    s32 v2;
-
-    // TODO: Clean this up.
-    v1 = a0->listLength - a0->windowTopIndex;
-    v2 = a0->visibleEntries;
-    if (v1 > a0->visibleEntries)
-        v1 = v2;
-    sub_81C83AC(a0->unk10, a0->windowTopIndex, v1, a0->unkC, 0, a1);
-}
-
-void sub_81C83AC(u32 a0, u32 a1, u32 a2, u32 a3, u32 a4, struct UnknownInnerStruct_81C81D4 *a5)
-{
-    if (a2 == 0)
-        return;
-
-    a5->unk1C = a0 + a1 * a3;
-    a5->unk18 = a3;
-    a5->unk0.unkC = 0;
-    a5->unk0.unkE = a2;
-    a5->unk14 = a1;
-    a5->unk10 = a4;
-    CreateLoopedTask(LoopedTask_sub_81C83F0, 5);
-}
-
-bool32 sub_81C83E0(void)
-{
-    return FuncIsActiveLoopedTask(LoopedTask_sub_81C83F0);
-}
-
-u32 LoopedTask_sub_81C83F0(s32 a0)
-{
-    struct UnknownInnerStruct_81C81D4 *structPtr;
-    u32 v1;
-
-    structPtr = &((struct UnknownSubStruct_81C81D4*)GetSubstructPtr(0x11))->unk0;
-    switch (a0)
-    {
-    case 0:
-        v1 = (structPtr->unk0.unkA + structPtr->unk0.unkC + structPtr->unk10) & 0xF;
-        structPtr->unk34(structPtr->unk1C, structPtr->unkTextBuffer);
-        if (structPtr->unk38 != NULL)
-            // Accessing unk0.windowId as if it were a u16...?
-            // It's accessed as a u8 again in the very next line...
-            structPtr->unk38(*(u16*)(&structPtr->unk0.windowId), structPtr->unk14, v1);
-        
-        AddTextPrinterParameterized(structPtr->unk0.windowId, structPtr->unk0.fontId, structPtr->unkTextBuffer, 8, (v1 << 4) + 1, 255, NULL);
-        
-        if (++structPtr->unk0.unkC >= structPtr->unk0.unkE)
-        {
-            if (structPtr->unk38 != NULL)
-                CopyWindowToVram(structPtr->unk0.windowId, 3);
-            else
-                CopyWindowToVram(structPtr->unk0.windowId, 2);
-            return 0;
-        }
-        else
-        {
-            structPtr->unk1C += structPtr->unk18;
-            structPtr->unk14++;
-            return 3;
-        }
-    case 1:
-        if (IsDma3ManagerBusyWithBgCopy())
-            return 2;
-        else
-            return 4;
-    default:
-        return 4;
-    }
-}
-
-bool32 ShouldShowUpArrow(void)
-{
-    u16 v1;
-    s32 v2;
-    struct UnknownSubStruct_81C81D4 *structPtr;
-    structPtr = GetSubstructPtr(0x11);
-
-    return structPtr->unk888.windowTopIndex != 0;
-}
-
-bool32 ShouldShowDownArrow(void)
-{
-    struct MatchCallWindowState *subPtr;
-    struct UnknownSubStruct_81C81D4 *structPtr;
-    structPtr = GetSubstructPtr(0x11);
-    subPtr = &structPtr->unk888;
-    
-    return subPtr->windowTopIndex + subPtr->visibleEntries < subPtr->listLength;
-}
-
-
-#ifdef NONMATCHING
-// This has some register renaming issues (r4, r5, and r6 are all switched around), and
-// for some reason it's creating two copies of subPtr->unk0.
-// TODO: Now I know why it's making two copies - one of them is UnknownInnerStruct_81C81D4.
-void MatchCall_MoveWindow(s32 a0, bool32 a1)
-{
-    s32 v1;
-    struct MatchCallWindowState *subPtr;
-    struct UnknownSubStruct_81C81D4 *structPtr;
-    structPtr = GetSubstructPtr(0x11);
-    subPtr = &structPtr->unk888;
-
-    if (a0 < 0)
-    {
-        // This is where the issue is. subPtr->windowTopIndex is being stored in r1 and then copied to
-        // r2... and then r2 is read for the if statement, r1 is read for the function call,
-        // and then both are clobbered as expected. Between those two uses, no writes to r1/r2
-        // happen; it doesn't need to be duplicated/moved at all.
-        if (subPtr->windowTopIndex + a0 < 0)
-            v1 = -1 * subPtr->windowTopIndex;
-        else
-            v1 = a0;
-        if (a1)
-            sub_81C83AC(subPtr->unk10, subPtr->windowTopIndex + v1, v1 * -1, subPtr->unkC, v1, structPtr);
-    }
-    else if (a1)
-    {
-        
-        gUnknown_0203CF44 = subPtr->windowTopIndex + subPtr->visibleEntries;
-        if ((s32)(gUnknown_0203CF44) + a0 >= (s32)subPtr->listLength)
-            v1 = subPtr->listLength - gUnknown_0203CF44;
-        else
-            v1 = a0;
-        
-        sub_81C83AC(subPtr->unk10, gUnknown_0203CF44, v1, subPtr->unkC, subPtr->visibleEntries, structPtr);
-        // Needed to prevent GCC from combining the two sub_81C83AC calls.
-        asm("");
-    }
-    else
-    {
-        v1 = a0;
-    }
-    
-    sub_81C8568(v1, structPtr);
-    subPtr->windowTopIndex++;
-}
-#else
-NAKED
-void MatchCall_MoveWindow(s32 a0, bool32 a1)
-{
-    asm(".syntax unified\n\
-	push {r4-r7,lr}\n\
-	sub sp, 0x8\n\
-	adds r6, r0, 0\n\
-	adds r4, r1, 0\n\
-	movs r0, 0x11\n\
-	bl GetSubstructPtr\n\
-	adds r7, r0, 0\n\
-	ldr r0, =0x00000888\n\
-	adds r5, r7, r0\n\
-	cmp r6, 0\n\
-	bge _081C8524\n\
-	ldrh r1, [r5]\n\
-	adds r0, r1, r6\n\
-	cmp r0, 0\n\
-	bge _081C850A\n\
-	negs r6, r1\n\
-_081C850A:\n\
-	cmp r4, 0\n\
-	beq _081C854E\n\
-	ldr r0, [r5, 0x10]\n\
-	adds r1, r6\n\
-	negs r2, r6\n\
-	ldr r3, [r5, 0xC]\n\
-	str r6, [sp]\n\
-	str r7, [sp, 0x4]\n\
-	bl sub_81C83AC\n\
-	b _081C854E\n\
-	.pool\n\
-_081C8524:\n\
-	cmp r4, 0\n\
-	beq _081C854E\n\
-	ldr r2, =gUnknown_0203CF44\n\
-	ldrh r1, [r5]\n\
-	ldrh r0, [r5, 0x8]\n\
-	adds r4, r1, r0\n\
-	str r4, [r2]\n\
-	adds r0, r4, r6\n\
-	ldrh r1, [r5, 0x2]\n\
-	cmp r0, r1\n\
-	blt _081C853C\n\
-	subs r6, r1, r4\n\
-_081C853C:\n\
-	ldr r0, [r5, 0x10]\n\
-	ldr r3, [r5, 0xC]\n\
-	ldrh r1, [r5, 0x8]\n\
-	str r1, [sp]\n\
-	str r7, [sp, 0x4]\n\
-	adds r1, r4, 0\n\
-	adds r2, r6, 0\n\
-	bl sub_81C83AC\n\
-_081C854E:\n\
-	adds r0, r6, 0\n\
-	adds r1, r7, 0\n\
-	bl sub_81C8568\n\
-	ldrh r0, [r5]\n\
-	adds r0, r6\n\
-	strh r0, [r5]\n\
-	add sp, 0x8\n\
-	pop {r4-r7}\n\
-	pop {r0}\n\
-	bx r0\n\
-	.pool\n\
-    .syntax divided");
-}
-#endif
-
-void sub_81C8568(s32 a0, struct UnknownInnerStruct_81C81D4 *a1)
-{
-    a1->unk20 = GetBgY(a1->unk0.bg);
-    a1->unk24 = a1->unk20 + (a0 << 12);
-    if (a0 > 0)
-        a1->unk30 = 1;
-    else
-        a1->unk30 = 2;
-    a1->unk2C = a0;
-    a1->unk28 = CreateLoopedTask(LoopedTask_sub_81C85A0, 6);
-}
-
-u32 LoopedTask_sub_81C85A0(s32 a0)
-{
-    s32 y;
-    s32 v1;
-    bool32 flag;
-    struct UnknownInnerStruct_81C81D4 *structPtr;
-    structPtr = &((struct UnknownSubStruct_81C81D4 *)GetSubstructPtr(0x11))->unk0;
-    
-    switch (a0)
-    {
-    case 0:
-        if (sub_81C83E0() == FALSE)
-            return 1;
-        else
-            return 2;
-    case 1:
-        flag = FALSE;
-        y = GetBgY(structPtr->unk0.bg);
-        v1 = ChangeBgY(structPtr->unk0.bg, 0x1000, structPtr->unk30);
-        if (structPtr->unk30 == 2)
-        {
-            if ((y > structPtr->unk24 || y <= structPtr->unk20) && v1 <= structPtr->unk24)
-            {
-                flag = TRUE;
-            }
-        }
-        else
-        {
-            if ((y < structPtr->unk24 || y >= structPtr->unk20) && v1 >= structPtr->unk24)
-            {
-                flag = TRUE;
-            }
-        }
-        if (flag)
-        {
-            structPtr->unk0.unkA = (structPtr->unk0.unkA + structPtr->unk2C) & 0xF;
-            ChangeBgY(structPtr->unk0.bg, structPtr->unk24, 0);
-            return 4;
-        }
-        else
-        {
-            return 2;
-        }
-    default:
-        return 4;
-    }
-}
-
-bool32 sub_81C8630(void)
-{
-    struct UnknownSubStruct_81C81D4 *structPtr;
-    structPtr = GetSubstructPtr(0x11);
-    return IsLoopedTaskActive(structPtr->unk0.unk28);
-}
-
-struct MatchCallWindowState *GetMatchCallWindowStruct(void)
-{
-    struct UnknownSubStruct_81C81D4 *structPtr;
-    structPtr = GetSubstructPtr(0x11);
-    return &structPtr->unk888;
-}
-
-u32 MatchCall_MoveCursorUp(void)
-{
-    struct MatchCallWindowState *structPtr;
-    structPtr = GetMatchCallWindowStruct();
-
-    if (structPtr->selectedIndexOffset != 0)
-    {
-        structPtr->selectedIndexOffset--;
-        return 1;
-    }
-    else
-    {
-        if (ShouldShowUpArrow())
-        {
-            MatchCall_MoveWindow(-1, TRUE);
-            return 2;
-        }
-        else
-        {
-            return 0;
-        }
-    }
-}
-
-u32 MatchCall_MoveCursorDown(void)
-{
-    struct MatchCallWindowState *structPtr;
-    structPtr = GetMatchCallWindowStruct();
-
-    if (structPtr->windowTopIndex + structPtr->selectedIndexOffset < structPtr->listLength - 1)
-    {
-        if (structPtr->selectedIndexOffset < structPtr->visibleEntries - 1)
-        {
-            structPtr->selectedIndexOffset++;
-            return 1;
-        }
-        else if (!ShouldShowDownArrow())
-        {
-            return 0;
-        }
-    }
-    else
-    {
-        return 0;
-    }
-    MatchCall_MoveWindow(1, TRUE);
-    return 2;
-}
-
-u32 MatchCall_PageUp(void)
-{
-    struct MatchCallWindowState *structPtr;
-    s32 scroll;
-    
-    structPtr = GetMatchCallWindowStruct();
-    if (ShouldShowUpArrow())
-    {
-        if (structPtr->windowTopIndex >= structPtr->visibleEntries)
-            scroll = structPtr->visibleEntries;
-        else
-            scroll = structPtr->windowTopIndex;
-        MatchCall_MoveWindow(scroll * -1, TRUE);
-        return 2;
-    }
-    else if (structPtr->selectedIndexOffset != 0)
-    {
-        structPtr->selectedIndexOffset = 0;
-        return 1;
-    }
-    else
-    {
-        return 0;
-    }
-}
-
-u32 MatchCall_PageDown(void)
-{
-    struct MatchCallWindowState *structPtr;
-    structPtr = GetMatchCallWindowStruct();
-
-    if (ShouldShowDownArrow())
-    {
-        s32 scroll;
-        s32 windowBottomIndex;
-        s32 v3;
-        windowBottomIndex = structPtr->windowTopIndex + structPtr->visibleEntries;
-        scroll = structPtr->unk4 - structPtr->windowTopIndex;
-        if (windowBottomIndex <= structPtr->unk4)
-            scroll = structPtr->visibleEntries;
-        MatchCall_MoveWindow(scroll, TRUE);
-        return 2;
-    }
-    else
-    {
-        s32 cursor;
-        s32 lastVisibleIndex;
-        if (structPtr->listLength >= structPtr->visibleEntries)
-        {
-            cursor = structPtr->selectedIndexOffset;
-            lastVisibleIndex = structPtr->visibleEntries;
-        }
-        else
-        {
-            cursor = structPtr->selectedIndexOffset;
-            lastVisibleIndex = structPtr->listLength;
-        }
-        lastVisibleIndex -= 1;
-        if (cursor >= lastVisibleIndex)
-        {
-            return 0;
-        }
-        else
-        {
-            structPtr->selectedIndexOffset = lastVisibleIndex;
-            return 1;
-        }
-    }
-}
-
-u32 GetSelectedMatchCall(void)
-{
-    struct MatchCallWindowState *structPtr;
-    structPtr = GetMatchCallWindowStruct();
-
-    return structPtr->windowTopIndex + structPtr->selectedIndexOffset;
-}
-
-u32 GetMatchCallListTopIndex(void)
-{
-    struct MatchCallWindowState *structPtr;
-    structPtr = GetMatchCallWindowStruct();
-    
-    return structPtr->windowTopIndex;
-}
-
-void sub_81C877C(void)
-{
-    struct UnknownSubStruct_81C81D4 *structPtr;
-    structPtr = GetSubstructPtr(0x11);
-    structPtr->unk89C = 0;
-    structPtr->unk8A0 = CreateLoopedTask(LoopedTask_sub_81C8870, 6);
-}
-
-void sub_81C87AC(u16 a0)
-{
-    u16 temp;
-    struct UnknownSubStruct_81C81D4 *structPtr;
-    structPtr = GetSubstructPtr(0x11);
-    temp = structPtr->unk888.windowTopIndex;
-    temp += a0;
-    structPtr->unk888.windowTopIndex = temp;
-    structPtr->unk89C = 0;
-    structPtr->unk8A0 = CreateLoopedTask(LoopedTask_sub_81C8958, 6);
-}
-
-void sub_81C87F0(void)
-{
-    struct UnknownSubStruct_81C81D4 *structPtr;
-    structPtr = GetSubstructPtr(0x11);
-    structPtr->unk89C = 0;
-    structPtr->unk8A0 = CreateLoopedTask(LoopedTask_sub_81C8A28, 6);
-}
-
-bool32 sub_81C8820(void)
-{
-    struct UnknownSubStruct_81C81D4 *structPtr;
-    structPtr = GetSubstructPtr(0x11);
-    return IsLoopedTaskActive(structPtr->unk8A0);
-}
-
-void sub_81C8838(void)
-{
-    struct UnknownSubStruct_81C81D4 *structPtr;
-    struct MatchCallWindowState *subStr;
-    structPtr = GetSubstructPtr(0x11);
-    subStr = &structPtr->unk888;
-    structPtr->unk0.unk38(structPtr->unk0.unk0.windowId, subStr->windowTopIndex + subStr->selectedIndexOffset, (structPtr->unk0.unk0.unkA + subStr->selectedIndexOffset) & 0xF);
-    CopyWindowToVram(structPtr->unk0.unk0.windowId, 1);
-}
-
-u32 LoopedTask_sub_81C8870(s32 a0)
-{
-    struct UnknownSubStruct_81C81D4 *structPtr;
-    u16 v1;
-    u32 v2;
-
-    // Needed to fix a register renaming issue.
-    register u16* temp asm("r1");
-    structPtr = GetSubstructPtr(0x11);
-
-    switch (a0)
-    {
-    case 0:
-        ToggleMatchCallArrows(&structPtr->unk0, 1);
-        // fall-through
-    case 1:
-        if (structPtr->unk89C != structPtr->unk888.selectedIndexOffset)
-            sub_81C8B70(&structPtr->unk0.unk0, structPtr->unk89C, 1);
-        
-        structPtr->unk89C++;
-        return 0;
-    case 2:
-        if (IsDma3ManagerBusyWithBgCopy())
-            return 2;
-        
-        if (structPtr->unk89C != structPtr->unk888.visibleEntries)
-            return 6;
-        
-        if (structPtr->unk888.selectedIndexOffset != 0)
-            sub_81C8B70(&structPtr->unk0.unk0, structPtr->unk89C, structPtr->unk888.selectedIndexOffset);
-        
-        return 0;
-    case 3:
-        if (IsDma3ManagerBusyWithBgCopy())
-            return 2;
-        temp = &structPtr->unk888.selectedIndexOffset;
-        v1 = *temp;
-        if (v1 == 0)
-            return 4;
-        
-        MatchCall_MoveWindow(v1, FALSE);
-        return 0;
-    case 4:
-         v2 = sub_81C8630();
-         if (v2)
-            return 2;
-
-        structPtr->unk888.selectedIndexOffset = v2;
-        return 4;
-    default:
-        return 4;
-    }
-}
-
-u32 LoopedTask_sub_81C8958(s32 a0)
-{
-    struct UnknownSubStruct_81C81D4 *structPtr;
-    structPtr = GetSubstructPtr(0x11);
-    if (IsDma3ManagerBusyWithBgCopy())
-        return 2;
-    
-    switch (a0)
-    {
-    case 0:
-        sub_81C8CB4(&structPtr->unk888, &structPtr->unk0);
-        break;
-    case 1:
-        PrintMatchCallFieldNames(&structPtr->unk0, 0);
-        break;
-    case 2:
-        sub_81C8E54(&structPtr->unk888, &structPtr->unk0, 0);
-        break;
-    case 3:
-        PrintMatchCallFieldNames(&structPtr->unk0, 1);
-        break;
-    case 4:
-        sub_81C8E54(&structPtr->unk888, &structPtr->unk0, 1);
-        break;
-    case 5:
-        PrintMatchCallFieldNames(&structPtr->unk0, 2);
-        break;
-    case 6:
-        sub_81C8E54(&structPtr->unk888, &structPtr->unk0, 2);
-        break;
-    case 7:
-        sub_81C8E54(&structPtr->unk888, &structPtr->unk0, 3);
-        break;
-    default:
-        return 4;
-    }
-    return 0;
-}
-
-u32 LoopedTask_sub_81C8A28(s32 a0)
-{
-    struct UnknownSubStruct_81C81D4 *structPtr;
-    struct MatchCallWindowState *subPtr888;
-    register struct UnknownInnerStruct_81C81D4 *subPtr0 asm("r2");
-    s32 v4;
-
-    if (IsDma3ManagerBusyWithBgCopy())
-    {
-        return 2;
-    }
-    
-    structPtr = GetSubstructPtr(0x11);
-    subPtr888 = &structPtr->unk888;
-    subPtr0 = &structPtr->unk0;
-
-    switch (a0)
-    {
-    default:
-        return 4;
-    case 0:
-        sub_81C8D4C(subPtr888, subPtr0);
-        return 0;
-    case 1:
-    {
-        s32 v1;
-        s32 v2;
-        u32 *v3;
-        register s32 v4 asm("r5");
-
-        v3 = &structPtr->unk89C;
-        v1 = *v3 + 1;
-        *v3 = v1;
-        if (v1 < structPtr->unk888.visibleEntries)
-        {
-            sub_81C8B70(&subPtr0->unk0, v1, 1);
-            return 2;
-        }
-
-        *v3 = 0;
-        if (subPtr888->listLength <= subPtr888->visibleEntries)
-        {
-            register u32 temp asm("r0");
-            temp = subPtr888->windowTopIndex;
-            if (temp == 0)
-                return 9;
-            v2 = temp;
-        }
-        else
-        {
-            register s32 temp asm("r1");
-            v2 = subPtr888->windowTopIndex + subPtr888->visibleEntries;
-            temp = (s32)subPtr888->listLength;
-            if (v2 <= temp)
-                return 9;
-            v2 -= temp;
-        }
-        v4 = v2 * -1;
-        sub_81C8B70(&subPtr0->unk0, v4, v2);
-        subPtr888->selectedIndexOffset = v2;
-        *v3 = v4;
-        return 0;
-    }
-    case 2:
-        MatchCall_MoveWindow(structPtr->unk89C, FALSE);
-        return 0;
-    case 3:
-        if (sub_81C8630())
-            return 2;
-        
-        structPtr->unk89C = 0;
-        return 1;
-    case 4:
-        sub_81C83AC(subPtr888->unk10, subPtr888->windowTopIndex + structPtr->unk89C, 1, subPtr888->unkC, structPtr->unk89C, &structPtr->unk0);
-        return 0;
-    case 5:
-        if (sub_81C83E0())
-            return 2;
-        
-        v4 = ++structPtr->unk89C;
-        if (v4 >= subPtr888->listLength || v4 >= subPtr888->visibleEntries)
-            return 1;
-        return 9;
-    case 6:
-        ToggleMatchCallArrows(subPtr0, 0);
-        return 4;
-    }
-}
-
-void sub_81C8B70(struct UnknownSubSubStruct_0203CF40 *a0, u32 a1, u32 a2)
-{
-    u8 *v1;
-    u32 v2;
-
-    v1 = (u8*)GetWindowAttribute(a0->windowId, WINDOW_TILE_DATA);
-    v2 = a0->unk4 * 64;
-
-    a1 = (a0->unkA + a1) & 0xF;
-    if ((s32)(a1 + a2) <= 16)
-    {
-        CpuFastFill8(PIXEL_FILL(1), v1 + a1 * v2, a2 * v2);
-        CopyWindowToVram(a0->windowId, 2);
-    }
-    else
-    {
-        u32 v3;
-        u32 v4;
-
-        v3 = 16 - a1;
-        v4 = a2 - v3;
-
-        CpuFastFill8(PIXEL_FILL(1), v1 + a1 * v2, v3 * v2);
-        CpuFastFill8(PIXEL_FILL(1), v1, v4 * v2);
-        CopyWindowToVram(a0->windowId, 2);
-    }
-
-    a2 -= 1;
-    for (a2; a2 != -1; a1 = (a1 + 1) & 0xF, a2--)
-    {
-        sub_81CBD48(a0->windowId, a1);
-    }
-
-    CopyWindowToVram(a0->windowId, 1);
-}
-
-void sub_81C8C64(struct UnknownSubSubStruct_0203CF40 *a0, u32 a1)
-{
-    u16 *v1;
-    register u32 v2 asm("r0");
-    u32 v3;
-
-    v1 = (u16*)GetBgTilemapBuffer(GetWindowAttribute(a0->windowId, WINDOW_BG));
-
-    v1 = &v1[(a0->unkA << 6) + a0->unk2 - 1];
-
-    if (a1 != 0)
-    {
-        v2 = a0->unk1 << 12;
-        v3 = a0->unk6 + 1;
-    }
-    else
-    {
-        v2 = a0->unk1 << 12;
-        v3 = a0->unk6;
-    }
-    {
-        register u16 v5 asm("r1");
-        register u32 v6 asm("r0");
-        v6 = (v3 | v2);
-        v6 = v6 << 16;
-        v5 = v6 >> 16;
-        v1[0] = v5;
-        v1[0x20] = v5;
-    }
-}
-
-void sub_81C8CB4(struct MatchCallWindowState *a0, struct UnknownInnerStruct_81C81D4 *a1)
-{
-    u8 colors[3];
-
-
-    memcpy(colors, sPokenavColors_0861FBE4, ARRAY_COUNT(sPokenavColors_0861FBE4));
-
-    a1->unk34(a0->unk10 + a0->unkC * a0->windowTopIndex, a1->unkTextBuffer);
-    a1->unk38(a1->unk0.windowId, a0->windowTopIndex, a1->unk0.unkA);
-    FillWindowPixelRect(a1->unk0.windowId, PIXEL_FILL(4), 0, a1->unk0.unkA * 16, a1->unk0.unk4 * 8, 16);
-    AddTextPrinterParameterized3(a1->unk0.windowId, a1->unk0.fontId, 8, (a1->unk0.unkA * 16) + 1, colors, TEXT_SPEED_FF, a1->unkTextBuffer);
-    sub_81C8C64(&a1->unk0, 1);
-    CopyWindowRectToVram(a1->unk0.windowId, 3, 0, a1->unk0.unkA * 2, a1->unk0.unk4, 2);
-}
-
-void sub_81C8D4C(struct MatchCallWindowState *a0, struct UnknownInnerStruct_81C81D4 *a1)
-{
-    a1->unk34(a0->unk10 + a0->unkC * a0->windowTopIndex, a1->unkTextBuffer);
-    FillWindowPixelRect(a1->unk0.windowId, PIXEL_FILL(1), 0, a1->unk0.unkA * 16, a1->unk0.unk4 * 8, 16);
-    AddTextPrinterParameterized(a1->unk0.windowId, a1->unk0.fontId, a1->unkTextBuffer, 8, a1->unk0.unkA * 16 + 1, TEXT_SPEED_FF, NULL);
-    sub_81C8C64(&a1->unk0, 0);
-    CopyWindowToVram(a1->unk0.windowId, 3);
-}
-
-void PrintMatchCallFieldNames(struct UnknownInnerStruct_81C81D4 *a0, u32 fieldId)
-{
-    const u8 *fieldNames[3];
-    u8 colors[3];
-    u32 r4;
-    u32 r5;
-    u32 tmp;
-    u32 one;
-
-    memcpy(fieldNames, sMatchCallFieldNames, sizeof(sMatchCallFieldNames));
-    memcpy(colors, sMatchCallFieldColors, sizeof(sMatchCallFieldColors));
-
-    r4 = a0->unk0.unkA;
-    tmp = fieldId * 2 + 1;
-    r4 += tmp;
-    r4 &= 0xF;
-    FillWindowPixelRect(a0->unk0.windowId, PIXEL_FILL(1), 0, r4 << 4, a0->unk0.unk4, 16);
-    
-    // This is a fake match. It should be this:
-    // AddTextPrinterParameterized3(a0->unk0.windowId, 7, 2, r4 << 4 + 1, colors, TEXT_SPEED_FF, fieldNames[fieldId]);
-    // But the original GCC does some clever reuse of the `1` constant that the current GCC doesn't.
-    one = 1;
-    AddTextPrinterParameterized3(a0->unk0.windowId, 7, 2, (r4 << 4) + one, colors, one - 2, fieldNames[fieldId]);
-    CopyWindowRectToVram(a0->unk0.windowId, 2, 0, r4 << 1, a0->unk0.unk4, 2);
-}
-
-void sub_81C8E54(struct MatchCallWindowState *a0, struct UnknownInnerStruct_81C81D4 *a1, u32 a2)
-{
-    const u8 *str;
-    u32 r6;
-
-    r6 = (a1->unk0.unkA + sUnknown_0861FBF7[a2]) & 0xF;
-
-    str = sub_81CAFD8(a0->windowTopIndex, a2);
-    if (str != NULL) {
-        sub_81DB620(a1->unk0.windowId, 1, r6 * 2, a1->unk0.unk4 - 1, 2);
-        AddTextPrinterParameterized(a1->unk0.windowId, 7, str, 2, (r6 << 4) + 1, TEXT_SPEED_FF, NULL);
-        CopyWindowRectToVram(a1->unk0.windowId, 2, 0, r6 * 2, a1->unk0.unk4, 2);
-    }
-}
-
-void sub_81C8ED0(void)
-{
-    u32 i;
-    const struct CompressedSpriteSheet *ptr;
-    
-    for (i = 0, ptr = sMatchcallArrowSpriteSheet; i < ARRAY_COUNT(sMatchcallArrowSpriteSheet); ptr++, i++)
-    {
-        LoadCompressedSpriteSheet(ptr);
-    }
-    Pokenav_AllocAndLoadPalettes(sMatchcallArrowPalette);
-}
-
-void sub_81C8EF8(struct MatchCallWindowState *a0, struct UnknownInnerStruct_81C81D4 *a1)
-{
-    register u32 spriteId asm("r3");
-    s16 temp;
-
-    spriteId = (u8)CreateSprite(&sMatchCallRightArrowSprite, a1->unk0.unk2 * 8 + 3, (a1->unk0.unk3 + 1) * 8, 7);
-    a1->rightArrow = &gSprites[spriteId];
-
-    temp = a1->unk0.unk2 * 8 + (a1->unk0.unk4 - 1) * 4;
-    spriteId = (u8)CreateSprite(&sMatchCallUpDownArrowSprite, temp, a1->unk0.unk3 * 8 + a0->visibleEntries * 16, 7);
-    a1->downArrow = &gSprites[spriteId];
-    a1->downArrow->oam.tileNum += 2;
-    a1->downArrow->callback = SpriteCB_MatchCallDownArrow;
-
-    spriteId = (u8)CreateSprite(&sMatchCallUpDownArrowSprite, temp, a1->unk0.unk3 * 8, 7);
-    a1->upArrow = &gSprites[spriteId];
-    a1->upArrow->oam.tileNum += 4;
-    a1->upArrow->callback = SpriteCB_MatchCallUpArrow;
-}
-
-void sub_81C8FE0(struct UnknownInnerStruct_81C81D4 *a0)
-{
-    DestroySprite(a0->rightArrow);
-    DestroySprite(a0->upArrow);
-    DestroySprite(a0->downArrow);
-    FreeSpriteTilesByTag(0xA);
-    FreeSpritePaletteByTag(0x14);
-}
-
-void ToggleMatchCallArrows(struct UnknownInnerStruct_81C81D4 *a0, bool32 shouldHide)
-{
-    if (shouldHide)
-    {
-        a0->rightArrow->callback = SpriteCallbackDummy;
-        a0->upArrow->callback = SpriteCallbackDummy;
-        a0->downArrow->callback = SpriteCallbackDummy;
-    }
-    else
-    {
-        a0->rightArrow->callback = SpriteCB_MatchCallRightArrow;
-        a0->upArrow->callback = SpriteCB_MatchCallUpArrow;
-        a0->downArrow->callback = SpriteCB_MatchCallDownArrow;
-    }
-    a0->rightArrow->invisible = shouldHide;
-    a0->upArrow->invisible = shouldHide;
-    a0->downArrow->invisible = shouldHide;
-}
-
-void SpriteCB_MatchCallRightArrow(struct Sprite *sprite)
-{
-    struct UnknownSubStruct_81C81D4 *structPtr;
-    structPtr = GetSubstructPtr(0x11);
-    sprite->pos2.y = structPtr->unk888.selectedIndexOffset << 4;
-}
-
-void SpriteCB_MatchCallDownArrow(struct Sprite *sprite)
-{
-    if (sprite->data[7] == 0 && ShouldShowDownArrow())
-        sprite->invisible = FALSE;
-    else
-        sprite->invisible = TRUE;
-    
-    if (++sprite->data[0] > 3)
-    {
-        s16 offset;
-
-        sprite->data[0] = 0;
-        offset = (sprite->data[1] + 1) & 7;
-        sprite->data[1] = offset;
-        sprite->pos2.y = offset;
-    }
-}
-
-void SpriteCB_MatchCallUpArrow(struct Sprite *sprite)
-{
-    if (sprite->data[7] == 0 && ShouldShowUpArrow())
-        sprite->invisible = FALSE;
-    else
-        sprite->invisible = TRUE;
-    
-    if (++sprite->data[0] > 3)
-    {
-        s16 offset;
-
-        sprite->data[0] = 0;
-        offset = (sprite->data[1] + 1) & 7;
-        sprite->data[1] = offset;
-        sprite->pos2.y = -1 * offset;
-    }
-}
-
-void ToggleMatchCallVerticalArrows(bool32 shouldHide)
-{
-    struct UnknownSubStruct_81C81D4 *structPtr;
-    structPtr = GetSubstructPtr(0x11);
-    structPtr->unk0.upArrow->data[7] = shouldHide;
-    structPtr->unk0.downArrow->data[7] = shouldHide;
-}
-
-void sub_81C9160(struct MatchCallWindowState *a0, struct MatchCallListTemplate *a1)
-{
-    u32 unused1 = a0->unk10 = a1->unk0;
-    u32 v0 = a1->unk6;
-    u32 zero = 0;
-    u32 unused2 = a0->windowTopIndex = v0;
-    u32 v1 = a0->listLength = a1->unk4;
-
-    a0->unkC = a1->unk8;
-    a0->visibleEntries = a1->unkC;
-    if (a0->visibleEntries >= (u16)v1)
-    {
-        a0->windowTopIndex = 0;
-        a0->unk4 = 0;
-        a0->selectedIndexOffset = v0; 
-    }
-    else
-    {
-        s32 v2;
-        a0->unk4 = a0->listLength - a0->visibleEntries;
-        v2 = a0->windowTopIndex + a0->visibleEntries;
-        if (v2 > a0->listLength) {
-            a0->selectedIndexOffset = v2 - a0->listLength;
-            a0->windowTopIndex = v0 - a0->selectedIndexOffset;
-        }
-        else
-        {
-            a0->selectedIndexOffset = 0;
-        }
-    }
-}
-
-u32 sub_81C91AC(struct UnknownInnerStruct_81C81D4 *a0, const struct BgTemplate *a1, struct MatchCallListTemplate *a2, s32 a3)
-{
-    register u32 raw_bg asm("r4") = ((a1->bg) << 30);
-    u8 bg = raw_bg >> 30;
-    u32 unknown = 0;
-    struct WindowTemplate window;
-    u8 bg_again;
-
-    a0->unk0.bg = bg;
-    a0->unk0.unk6 = a3;
-    a0->unk34 = a2->unk10;
-    a0->unk38 = a2->unk14;
-    a0->unk0.unk1 = a2->unkD;
-    a0->unk0.unk2 = a2->unk9;
-    a0->unk0.unk3 = a2->unkB;
-    a0->unk0.unk4 = a2->unkA;
-    a0->unk0.fontId = a2->unkE;
-    
-    window.bg = raw_bg >> 30;
-    window.tilemapLeft = a2->unk9;
-    window.tilemapTop = 0;
-    window.width = a2->unkA;
-    window.height = 32;
-    window.paletteNum = a2->unkD;
-    window.baseBlock = a3 + 2;
-
-    a0->unk0.windowId = AddWindow(&window);
-    if (a0->unk0.windowId == 0xFF)
-    {
-        return 0;
-    }
-    else
-    {
-        a0->unk0.unkA = unknown;
-        a0->rightArrow = NULL;
-        a0->upArrow = NULL;
-        a0->downArrow = NULL;
-        return 1;
-    }
-}
\ No newline at end of file
diff --git a/src/pokenav_main_menu.c b/src/pokenav_main_menu.c
new file mode 100644
index 000000000..a7ea1b7dc
--- /dev/null
+++ b/src/pokenav_main_menu.c
@@ -0,0 +1,990 @@
+#include "global.h"
+#include "pokenav.h"
+#include "constants/songs.h"
+#include "sound.h"
+#include "constants/rgb.h"
+#include "palette.h"
+#include "bg.h"
+#include "window.h"
+#include "strings.h"
+#include "graphics.h"
+#include "decompress.h"
+#include "gpu_regs.h"
+#include "menu.h"
+#include "dma3.h"
+
+enum
+{
+    NAVGEAR_GFX_MAIN_MENU,
+    NAVGEAR_GFX_CONDITION_MENU,
+    NAVGEAR_GFX_RIBBONS_MENU,
+    NAVGEAR_GFX_MATCH_CALL_MENU,
+    
+    // One of these is for the zoomed-in map, and the other is for the
+    // zoomed-out map. Don't know which is which yet.
+    NAVGEAR_GFX_MAP_MENU_UNK0,
+    NAVGEAR_GFX_MAP_MENU_UNK1,
+
+    NAVGEAR_GFX_PARTY_MENU,
+    NAVGEAR_GFX_SEARCH_MENU,
+    NAVGEAR_GFX_COOL_MENU,
+    NAVGEAR_GFX_BEAUTY_MENU,
+    NAVGEAR_GFX_CUTE_MENU,
+    NAVGEAR_GFX_SMART_MENU,
+    NAVGEAR_GFX_TOUGH_MENU,
+
+    NAVGEAR_GFX_MENUS_END
+};
+
+#define NAVGEAR_GFX_SUBMENUS_START NAVGEAR_GFX_PARTY_MENU
+
+struct PokenavMainMenuResources
+{
+    void (*unk0)(u32);
+    u32 (*unk4)(void);
+    u32 unk8;
+    u32 currentTaskId;
+    u32 unk10;
+    u32 unk14;
+    struct Sprite *spinningNavgear;
+    struct Sprite *leftHeaderSprites[2];
+    struct Sprite *submenuLeftHeaderSprites[2];
+    u8 tilemapBuffer[0x800];
+};
+
+// This struct uses a 32bit tag, and doesn't have a size field.
+// Needed to match LoadLeftHeaderGfxForSubMenu.
+struct CompressedSpriteSheetNoSize
+{
+    const u32 *data;  // LZ77 compressed palette data
+    u32 tag;
+};
+
+extern void sub_81CAADC(void);
+void CleanupPokenavMainMenuResources(void);
+void LoadLeftHeaderGfxForSubMenu(u32 arg0);
+void LoadLeftHeaderGfxForMenu(u32 arg0);
+void HideLeftHeaderSubmenuSprites(bool32 arg0);
+void HideLeftHeaderSprites(bool32 arg0);
+void ShowLeftHeaderSprites(u32 arg0, bool32 arg1);
+void ShowLeftHeaderSubmenuSprites(u32 arg0, bool32 arg1);
+void MoveLeftHeader(struct Sprite *sprite, s32 arg1, s32 arg2, s32 arg3);
+void SpriteCB_MoveLeftHeader(struct Sprite *sprite);
+void InitPokenavMainMenuResources(void);
+void InitHoenMapHeaderSprites(void);
+void sub_81C7B74(void);
+void CopyPaletteIntoBufferUnfaded(const u16 *palette, u32 a1, u32 a2);
+u32 LoopedTask_ScrollMenuHeaderDown(s32 a0);
+u32 LoopedTask_ScrollMenuHeaderUp(s32 a0);
+void sub_81C7BF8(u32 a0);
+
+
+void SpriteCB_SpinningNavgear(struct Sprite* sprite);
+u32 LoopedTask_InitPokenavMenu(s32 a0);
+
+const u16 gSpinningNavgearPaletteData[] = INCBIN_U16("graphics/pokenav/icon2.gbapal");
+const u32 gSpinningNavgearGfx[] = INCBIN_U32("graphics/pokenav/icon2.4bpp.lz");
+const u32 gUnused_SpinningNavgearGfx2[] = INCBIN_U32("graphics/pokenav/icon2_unused.4bpp.lz");
+
+const struct BgTemplate gPokenavMainMenuBgTemplates[] =
+{
+    {
+        .bg = 0,
+        .charBaseIndex = 0,
+        .mapBaseIndex = 5,
+        .screenSize = 0,
+        .paletteMode = 0,
+        .priority = 0,
+        .baseTile = 0,
+    }
+};
+
+const struct WindowTemplate gUnknown_0861FA08[2] =
+{
+    {
+        .bg = 0,
+        .tilemapLeft = 1,
+        .tilemapTop = 22,
+        .width = 16,
+        .height = 2,
+        .paletteNum = 0,
+        .baseBlock = 0x36,
+    },
+    {
+        .bg = 0xFF,
+        .tilemapLeft = 0,
+        .tilemapTop = 0,
+        .width = 0,
+        .height = 0,
+        .paletteNum = 0,
+        .baseBlock = 0,
+    },
+};
+
+const u8 *const (sMenuButtonReminders[12]) =
+{
+    gText_Navgear_ClearButtonList,
+    gText_NavgearMap_ZoomedOutButtons,
+    gText_NavgearMap_ZoomedInButtons,
+    gText_NavgearCondition_MonListButtons,
+    gText_NavgearCondition_MonStatusButtons,
+    gText_NavgearCondition_MarkingButtons,
+    gText_NavgearMatchCall_TrainerListButtons,
+    gText_NavgearMatchCall_CallMenuButtons,
+    gText_NavgearMatchCall_CheckTrainerButtons,
+    gText_NavgearRibbons_MonListButtons,
+    gText_NavgearRibbons_RibbonListButtons,
+    gText_NavgearRibbons_RibbonCheckButtons,
+};
+
+const u8 gMenuButtonReminderColor[4] =
+{
+    4, 1, 2, 0
+};
+
+static const struct CompressedSpriteSheet gSpinningNavgearSpriteSheet[] =
+{
+    {
+        .data = gSpinningNavgearGfx,
+        .size = 0x1000,
+        .tag = 0,
+    }
+};
+
+static const struct SpritePalette gSpinningNavgearPalette[] =
+{
+    {
+        .data = gSpinningNavgearPaletteData,
+        .tag = 0,
+    },
+    {}
+};
+
+static const struct CompressedSpriteSheet sPokenavHoenMapLeftHeaderSpriteSheet =
+{
+    .data = gPokenavLeftHeaderHoennMap_Gfx,
+    .size = 0xC00,
+    .tag = 2
+};
+
+static const struct CompressedSpriteSheet sPokenavMenuLeftHeaderSpriteSheets[] =
+{
+    [NAVGEAR_GFX_MAIN_MENU] = {
+        .data = gPokenavLeftHeaderMainMenu_Gfx,
+        .size = 0x20,
+        .tag = 3
+    },
+    [NAVGEAR_GFX_CONDITION_MENU] = {
+        .data = gPokenavLeftHeaderCondition_Gfx,
+        .size = 0x20,
+        .tag = 1
+    },
+    [NAVGEAR_GFX_RIBBONS_MENU] = {
+        .data = gPokenavLeftHeaderRibbons_Gfx,
+        .size = 0x20,
+        .tag = 2
+    },
+    [NAVGEAR_GFX_MATCH_CALL_MENU] = {
+        .data = gPokenavLeftHeaderMatchCall_Gfx,
+        .size = 0x20,
+        .tag = 4
+    },
+    [NAVGEAR_GFX_MAP_MENU_UNK0] = {
+        .data = gPokenavLeftHeaderHoennMap_Gfx,
+        .size = 0x20,
+        .tag = 0
+    },
+    [NAVGEAR_GFX_MAP_MENU_UNK1] = {
+        .data = gPokenavLeftHeaderHoennMap_Gfx,
+        .size = 0x40,
+        .tag = 0
+    }
+};
+
+static const struct CompressedSpriteSheetNoSize sPokenavSubMenuLeftHeaderSpriteSheets[] =
+{
+    [NAVGEAR_GFX_PARTY_MENU - NAVGEAR_GFX_SUBMENUS_START] = {
+        .data = gPokenavLeftHeaderParty_Gfx,
+        .tag = 1
+    },
+    [NAVGEAR_GFX_SEARCH_MENU - NAVGEAR_GFX_SUBMENUS_START] = {
+        .data = gPokenavLeftHeaderSearch_Gfx,
+        .tag = 1
+    },
+    [NAVGEAR_GFX_COOL_MENU - NAVGEAR_GFX_SUBMENUS_START] = {
+        .data = gPokenavLeftHeaderCool_Gfx,
+        .tag = 4
+    },
+    [NAVGEAR_GFX_BEAUTY_MENU - NAVGEAR_GFX_SUBMENUS_START] = {
+        .data = gPokenavLeftHeaderBeauty_Gfx,
+        .tag = 1
+    },
+    [NAVGEAR_GFX_CUTE_MENU - NAVGEAR_GFX_SUBMENUS_START] = {
+        .data = gPokenavLeftHeaderCute_Gfx,
+        .tag = 2
+    },
+    [NAVGEAR_GFX_SMART_MENU - NAVGEAR_GFX_SUBMENUS_START] = {
+        .data = gPokenavLeftHeaderSmart_Gfx,
+        .tag = 0
+    },
+    [NAVGEAR_GFX_TOUGH_MENU - NAVGEAR_GFX_SUBMENUS_START] = {
+        .data = gPokenavLeftHeaderTough_Gfx,
+        .tag = 0
+    }
+};
+
+static const struct OamData sSpinningNavgearSpriteOam =
+{
+    .y = 0,
+    .affineMode = 0,
+    .objMode = 0,
+    .mosaic = 0,
+    .bpp = 0,
+    .shape = 0, // FIXME: Use SPRITE_SHAPE
+    .x = 0,
+    .matrixNum = 0,
+    .size = 2, // FIXME: Use SPRITE_SIZE
+    .tileNum = 0,
+    .priority = 0,
+    .paletteNum = 0,
+    .affineParam = 0
+};
+
+static const union AnimCmd sSpinningNavgearAnims[] =
+{
+    ANIMCMD_FRAME(0, 8),
+    ANIMCMD_FRAME(16, 8),
+    ANIMCMD_FRAME(32, 8),
+    ANIMCMD_FRAME(48, 8),
+    ANIMCMD_FRAME(64, 8),
+    ANIMCMD_FRAME(80, 8),
+    ANIMCMD_FRAME(96, 8),
+    ANIMCMD_FRAME(112, 8),
+    ANIMCMD_JUMP(0)
+};
+
+static const union AnimCmd *const sSpinningNavgearAnimTable[] =
+{
+    sSpinningNavgearAnims
+};
+
+static const struct SpriteTemplate sSpinningNavgearSpriteTemplate =
+{
+    .tileTag = 0,
+    .paletteTag = 0,
+    .oam = &sSpinningNavgearSpriteOam,
+    .anims = sSpinningNavgearAnimTable,
+    .images = NULL,
+    .affineAnims = gDummySpriteAffineAnimTable,
+    .callback = SpriteCB_SpinningNavgear
+};
+
+static const struct OamData sPokenavLeftHeaderHoenMapSpriteOam =
+{
+    .y = 0,
+    .affineMode = 0,
+    .objMode = 0,
+    .mosaic = 0,
+    .bpp = 0,
+    .shape = 1,
+    .x = 0,
+    .matrixNum = 0,
+    .size = 3,
+    .tileNum = 0,
+    .priority = 1,
+    .paletteNum = 0,
+    .affineParam = 0
+};
+
+static const struct OamData sUnknown_0861FB24 =
+{
+    .y = 0,
+    .affineMode = 0,
+    .objMode = 0,
+    .mosaic = 0,
+    .bpp = 0,
+    .shape = 1,
+    .x = 0,
+    .matrixNum = 0,
+    .size = 2,
+    .tileNum = 0,
+    .priority = 1,
+    .paletteNum = 0,
+    .affineParam = 0
+};
+
+static const struct SpriteTemplate sPokenavLeftHeaderHoenMapSpriteTemplate =
+{
+    .tileTag = 2,
+    .paletteTag = 1,
+    .oam = &sPokenavLeftHeaderHoenMapSpriteOam,
+    .anims = gDummySpriteAnimTable,
+    .images = NULL,
+    .affineAnims = gDummySpriteAffineAnimTable,
+    .callback = SpriteCallbackDummy
+};
+
+static const struct SpriteTemplate sUnknown_0861FB44 =
+{
+    .tileTag = 2,
+    .paletteTag = 2,
+    .oam = &sUnknown_0861FB24,
+    .anims = gDummySpriteAnimTable,
+    .images = NULL,
+    .affineAnims = gDummySpriteAffineAnimTable,
+    .callback = SpriteCallbackDummy
+};
+
+bool32 InitPokenavMainMenu(void)
+{
+    struct PokenavMainMenuResources *structPtr;
+    
+    structPtr = AllocSubstruct(0, sizeof(struct PokenavMainMenuResources));
+    if (structPtr == NULL)
+        return FALSE;
+
+    ResetSpriteData();
+    FreeAllSpritePalettes();
+    structPtr->currentTaskId = CreateLoopedTask(LoopedTask_InitPokenavMenu, 1);
+    return TRUE;
+}
+
+u32 PokenavMainMenuLoopedTaskIsActive(void)
+{
+    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
+    return IsLoopedTaskActive(structPtr->currentTaskId);
+}
+
+void ShutdownPokenav(void)
+{
+    PlaySE(SE_PN_OFF);
+    sub_81CAADC();
+    BeginNormalPaletteFade(0xFFFFFFFF, -1, 0, 16, RGB_BLACK);
+}
+
+bool32 WaitForPokenavShutdownFade(void)
+{
+    if (!gPaletteFade.active)
+    {
+        sub_81C99D4();
+        CleanupPokenavMainMenuResources();
+        FreeAllWindowBuffers();
+        return FALSE;
+    }
+
+    return TRUE;
+}
+
+u32 LoopedTask_InitPokenavMenu(s32 a0)
+{
+    struct PokenavMainMenuResources *structPtr;
+
+    switch (a0)
+    {
+    case 0:
+        SetGpuReg(REG_OFFSET_DISPCNT, DISPCNT_OBJ_ON | DISPCNT_OBJ_1D_MAP);
+        FreeAllWindowBuffers();
+        ResetBgsAndClearDma3BusyFlags(0);
+        InitBgsFromTemplates(0, gPokenavMainMenuBgTemplates, ARRAY_COUNT(gPokenavMainMenuBgTemplates));
+        ResetBgPositions();
+        reset_temp_tile_data_buffers();
+        return LT_INC_AND_CONTINUE;
+    case 1:
+        structPtr = GetSubstructPtr(0);
+        decompress_and_copy_tile_data_to_vram(0, &gPokenavHeader_Gfx, 0, 0, 0);
+        SetBgTilemapBuffer(0, structPtr->tilemapBuffer);
+        CopyToBgTilemapBuffer(0, &gPokenavHeader_Tilemap, 0, 0);
+        CopyPaletteIntoBufferUnfaded(gPokenavHeader_Pal, 0, 0x20);
+        CopyBgTilemapBufferToVram(0);
+        return LT_INC_AND_PAUSE;
+    case 2:
+        if (free_temp_tile_data_buffers_if_possible())
+            return LT_PAUSE;
+
+        sub_81C7B74();
+        return LT_INC_AND_PAUSE;
+    case 3:
+        if (IsDma3ManagerBusyWithBgCopy())
+            return LT_PAUSE;
+
+        InitPokenavMainMenuResources();
+        InitHoenMapHeaderSprites();
+        ShowBg(0);
+        return LT_FINISH;
+    default:
+        return LT_FINISH;
+    }
+}
+
+void sub_81C7834(void *func1, void *func2) // Fix types later.
+{
+    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
+    structPtr->unk0 = func1;
+    structPtr->unk4 = func2;
+    structPtr->unk8 = 0;
+}
+
+void sub_81C7850(u32 a0)
+{
+    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
+    structPtr->unk8 = 0;
+    structPtr->unk0(a0);
+}
+
+u32 sub_81C786C(void)
+{
+    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
+    return structPtr->unk4();
+}
+
+void sub_81C7880(void)
+{
+    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
+    structPtr->currentTaskId = CreateLoopedTask(LoopedTask_ScrollMenuHeaderDown, 4);
+}
+
+void sub_81C78A0(void)
+{
+    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
+    structPtr->currentTaskId = CreateLoopedTask(LoopedTask_ScrollMenuHeaderUp, 4);
+}
+
+bool32 MainMenuLoopedTaskIsBusy(void)
+{
+    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
+    return IsLoopedTaskActive(structPtr->currentTaskId);
+}
+
+u32 LoopedTask_ScrollMenuHeaderDown(s32 a0)
+{
+    switch (a0)
+    {
+    default:
+        return LT_FINISH;
+    case 1:
+        return LT_INC_AND_PAUSE;
+    case 0:
+        return LT_INC_AND_PAUSE;
+    case 2:
+        if (ChangeBgY(0, 384, 1) >= 0x2000u)
+        {
+            ChangeBgY(0, 0x2000, 0);
+            return LT_FINISH;
+        }
+
+        return LT_PAUSE;
+    }
+}
+
+u32 LoopedTask_ScrollMenuHeaderUp(s32 a0)
+{
+    if (ChangeBgY(0, 384, 2) <= 0)
+    {
+        ChangeBgY(0, 0, 0);
+        return 4;
+    }
+    return 2;
+}
+
+void CopyPaletteIntoBufferUnfaded(const u16 *palette, u32 bufferOffset, u32 size)
+{
+    CpuCopy16(palette, gPlttBufferUnfaded + bufferOffset, size);
+}
+
+void Pokenav_AllocAndLoadPalettes(const struct SpritePalette *palettes)
+{
+    const struct SpritePalette *current;
+    u32 index;
+
+    for (current = palettes; current->data != NULL; current++)
+    {
+        index = AllocSpritePalette(current->tag);
+        if (index == 0xFF)
+        {
+            break;
+        }
+        else
+        {
+            index = (index * 16) + 0x100;
+            CopyPaletteIntoBufferUnfaded(current->data, index, 0x20);
+        }
+    }
+}
+
+void sub_81C7990(u32 a0, u16 a1)
+{
+    CpuFill16(a1, gPlttBufferFaded + 0x100 + (a0 * 16), 16 * sizeof(u16));
+}
+
+__attribute__((naked))
+void sub_81C79BC(u16 *a0, u16 *a1, u32 a2, u32 a3, u32 a4, u32 a5)
+{
+    asm(".syntax unified\n\
+    push {r4-r7,lr}\n\
+    mov r7, r10\n\
+    mov r6, r9\n\
+    mov r5, r8\n\
+    push {r5-r7}\n\
+    sub sp, 0xC\n\
+    str r0, [sp]\n\
+    str r1, [sp, 0x4]\n\
+    mov r10, r2\n\
+    str r3, [sp, 0x8]\n\
+    ldr r0, [sp, 0x2C]\n\
+    cmp r0, 0\n\
+    bne _081C79E4\n\
+    ldr r2, =0x001fffff\n\
+    mov r1, r10\n\
+    ands r2, r1\n\
+    ldr r0, [sp]\n\
+    b _081C79F4\n\
+    .pool\n\
+_081C79E4:\n\
+    ldr r2, [sp, 0x2C]\n\
+    ldr r0, [sp, 0x8]\n\
+    cmp r2, r0\n\
+    blt _081C7A00\n\
+    ldr r2, =0x001fffff\n\
+    mov r1, r10\n\
+    ands r2, r1\n\
+    ldr r0, [sp, 0x4]\n\
+_081C79F4:\n\
+    ldr r1, [sp, 0x30]\n\
+    bl CpuSet\n\
+    b _081C7AAE\n\
+    .pool\n\
+_081C7A00:\n\
+    movs r2, 0x1\n\
+    negs r2, r2\n\
+    add r10, r2\n\
+    b _081C7AA6\n\
+_081C7A08:\n\
+    ldr r1, [sp]\n\
+    ldrh r0, [r1]\n\
+    movs r2, 0x1F\n\
+    mov r9, r2\n\
+    mov r1, r9\n\
+    ands r1, r0\n\
+    mov r9, r1\n\
+    lsls r0, 16\n\
+    lsrs r2, r0, 21\n\
+    movs r1, 0x1F\n\
+    ands r1, r2\n\
+    mov r8, r1\n\
+    lsrs r7, r0, 26\n\
+    movs r2, 0x1F\n\
+    ands r7, r2\n\
+    ldr r0, [sp, 0x4]\n\
+    ldrh r4, [r0]\n\
+    movs r0, 0x1F\n\
+    ands r0, r4\n\
+    mov r1, r9\n\
+    subs r0, r1\n\
+    lsls r0, 8\n\
+    ldr r1, [sp, 0x8]\n\
+    bl __divsi3\n\
+    ldr r2, [sp, 0x2C]\n\
+    adds r6, r0, 0\n\
+    muls r6, r2\n\
+    asrs r6, 8\n\
+    lsls r4, 16\n\
+    lsrs r0, r4, 21\n\
+    movs r1, 0x1F\n\
+    ands r0, r1\n\
+    mov r2, r8\n\
+    subs r0, r2\n\
+    lsls r0, 8\n\
+    ldr r1, [sp, 0x8]\n\
+    bl __divsi3\n\
+    ldr r1, [sp, 0x2C]\n\
+    adds r5, r0, 0\n\
+    muls r5, r1\n\
+    asrs r5, 8\n\
+    lsrs r4, 26\n\
+    movs r2, 0x1F\n\
+    ands r4, r2\n\
+    subs r4, r7\n\
+    lsls r4, 8\n\
+    adds r0, r4, 0\n\
+    ldr r1, [sp, 0x8]\n\
+    bl __divsi3\n\
+    ldr r1, [sp, 0x2C]\n\
+    muls r0, r1\n\
+    asrs r0, 8\n\
+    add r6, r9\n\
+    movs r2, 0x1F\n\
+    ands r6, r2\n\
+    add r5, r8\n\
+    ands r5, r2\n\
+    adds r0, r7, r0\n\
+    ands r0, r2\n\
+    lsls r0, 10\n\
+    lsls r5, 5\n\
+    orrs r0, r5\n\
+    orrs r0, r6\n\
+    ldr r1, [sp, 0x30]\n\
+    strh r0, [r1]\n\
+    ldr r2, [sp]\n\
+    adds r2, 0x2\n\
+    str r2, [sp]\n\
+    ldr r0, [sp, 0x4]\n\
+    adds r0, 0x2\n\
+    str r0, [sp, 0x4]\n\
+    adds r1, 0x2\n\
+    str r1, [sp, 0x30]\n\
+    movs r1, 0x1\n\
+    negs r1, r1\n\
+    add r10, r1\n\
+_081C7AA6:\n\
+    movs r0, 0x1\n\
+    negs r0, r0\n\
+    cmp r10, r0\n\
+    bne _081C7A08\n\
+_081C7AAE:\n\
+    add sp, 0xC\n\
+    pop {r3-r5}\n\
+    mov r8, r3\n\
+    mov r9, r4\n\
+    mov r10, r5\n\
+    pop {r4-r7}\n\
+    pop {r0}\n\
+    bx r0\n\
+    .syntax divided");
+}
+
+void sub_81C7AC0(s32 a0)
+{
+    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
+
+    switch (a0)
+    {
+    case 0:
+        BeginNormalPaletteFade(structPtr->unk14, -2, 0, 16, RGB_BLACK);
+        break;
+    case 1:
+        BeginNormalPaletteFade(structPtr->unk14, -2, 16, 0, RGB_BLACK);
+        break;
+    case 2:
+        BeginNormalPaletteFade(0xFFFFFFFF, -2, 0, 16, RGB_BLACK);
+        break;
+    case 3:
+        BeginNormalPaletteFade(0xFFFFFFFF, -2, 16, 0, RGB_BLACK);
+        break;
+    }
+}
+
+bool32 IsPaletteFadeActive(void)
+{
+    return gPaletteFade.active;
+}
+
+void sub_81C7B40(void)
+{
+    BlendPalettes(0xFFFEFFFE, 16, RGB_BLACK);
+}
+
+void InitBgTemplates(const struct BgTemplate *templates, s32 count)
+{
+    s32 i;
+
+    for (i = 0; i < count; i++)
+        InitBgFromTemplate(templates++);
+}
+
+void sub_81C7B74(void)
+{
+    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
+
+    InitWindows(&gUnknown_0861FA08[0]);
+    structPtr->unk10 = 0;
+    sub_81C7BF8(structPtr->unk10);
+    PutWindowTilemap(structPtr->unk10);
+    CopyWindowToVram(structPtr->unk10, 3); // TODO: Use a defined constant here.
+}
+
+void sub_81C7BA4(u32 a0)
+{
+    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
+
+    sub_81C7BF8(structPtr->unk10);
+    AddTextPrinterParameterized3(structPtr->unk10, 1, 0, 1, gMenuButtonReminderColor, 0, sMenuButtonReminders[a0]);
+}
+
+bool32 IsDma3ManagerBusyWithBgCopy_(void)
+{
+    return IsDma3ManagerBusyWithBgCopy();
+}
+
+void sub_81C7BF8(u32 windowId)
+{
+    FillWindowPixelBuffer(windowId, PIXEL_FILL(4));
+    FillWindowPixelRect(windowId, PIXEL_FILL(5), 0, 0, 0x80, 1);
+}
+
+void InitPokenavMainMenuResources(void)
+{
+    s32 i;
+    u8 spriteId;
+    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
+
+    for (i = 0; i < ARRAY_COUNT(gSpinningNavgearSpriteSheet); i++)
+        LoadCompressedSpriteSheet(&gSpinningNavgearSpriteSheet[i]);
+
+    Pokenav_AllocAndLoadPalettes(gSpinningNavgearPalette);
+    structPtr->unk14 = ~1 & ~(0x10000 << IndexOfSpritePaletteTag(0));
+    spriteId = CreateSprite(&sSpinningNavgearSpriteTemplate, 220, 12, 0);
+    structPtr->spinningNavgear = &gSprites[spriteId];
+}
+
+void CleanupPokenavMainMenuResources(void)
+{
+    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
+
+    DestroySprite(structPtr->spinningNavgear);
+    FreeSpriteTilesByTag(0);
+    FreeSpritePaletteByTag(0);
+}
+
+void SpriteCB_SpinningNavgear(struct Sprite *sprite)
+{
+    // If the background starts scrolling, follow it.
+    sprite->pos2.y = (GetBgY(0) / 256u) * -1;
+}
+
+struct Sprite *PauseSpinningNavgearSprite(void)
+{
+    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
+
+    structPtr->spinningNavgear->callback = SpriteCallbackDummy;
+    return structPtr->spinningNavgear;
+}
+
+void ResumeSpinningNavgearSprite(void)
+{
+    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
+
+    structPtr->spinningNavgear->pos1.x = 220;
+    structPtr->spinningNavgear->pos1.y = 12;
+    structPtr->spinningNavgear->callback = SpriteCB_SpinningNavgear;
+    structPtr->spinningNavgear->invisible = FALSE;
+    structPtr->spinningNavgear->oam.priority = 0;
+    structPtr->spinningNavgear->subpriority = 0;
+}
+
+void InitHoenMapHeaderSprites(void)
+{
+    s32 i, spriteId;
+    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
+
+    LoadCompressedSpriteSheet(&sPokenavHoenMapLeftHeaderSpriteSheet);
+    AllocSpritePalette(1);
+    AllocSpritePalette(2);
+    for (i = 0; i < (s32)ARRAY_COUNT(structPtr->leftHeaderSprites); i++)
+    {
+        spriteId = CreateSprite(&sPokenavLeftHeaderHoenMapSpriteTemplate, 0, 0, 1);
+        structPtr->leftHeaderSprites[i] = &gSprites[spriteId];
+        structPtr->leftHeaderSprites[i]->invisible = TRUE;
+        structPtr->leftHeaderSprites[i]->pos2.x = i * 64;
+
+        spriteId = CreateSprite(&sUnknown_0861FB44, 0, 0, 2);
+        structPtr->submenuLeftHeaderSprites[i] = &gSprites[spriteId];
+        structPtr->submenuLeftHeaderSprites[i]->invisible = TRUE;
+        structPtr->submenuLeftHeaderSprites[i]->pos2.x = i * 32;
+        structPtr->submenuLeftHeaderSprites[i]->pos2.y = 18;
+        structPtr->submenuLeftHeaderSprites[i]->oam.tileNum += (i * 8) + 64;
+    }
+}
+
+void LoadLeftHeaderGfxForIndex(u32 arg0)
+{
+    if (arg0 < NAVGEAR_GFX_SUBMENUS_START)
+        LoadLeftHeaderGfxForMenu(arg0);
+    else
+        LoadLeftHeaderGfxForSubMenu(arg0 - NAVGEAR_GFX_SUBMENUS_START);
+}
+
+void sub_81C7E14(u32 arg0)
+{
+    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
+
+    if (arg0 == 4)
+        structPtr->leftHeaderSprites[1]->oam.tileNum = GetSpriteTileStartByTag(2) + 32;
+    else
+        structPtr->leftHeaderSprites[1]->oam.tileNum = GetSpriteTileStartByTag(2) + 64;
+}
+
+void LoadLeftHeaderGfxForMenu(u32 index)
+{
+    struct PokenavMainMenuResources *structPtr;
+    u32 size, tag;
+
+    if (index >= NAVGEAR_GFX_SUBMENUS_START)
+        return;
+
+    structPtr = GetSubstructPtr(0);
+    tag = sPokenavMenuLeftHeaderSpriteSheets[index].tag;
+    size = GetDecompressedDataSize(sPokenavMenuLeftHeaderSpriteSheets[index].data);
+    LoadPalette(&gPokenavLeftHeader_Pal[tag * 16], (IndexOfSpritePaletteTag(1) * 16) + 0x100, 0x20);
+    LZ77UnCompWram(sPokenavMenuLeftHeaderSpriteSheets[index].data, gDecompressionBuffer);
+    RequestDma3Copy(gDecompressionBuffer, (void *)VRAM + 0x10000 + (GetSpriteTileStartByTag(2) * 32), size, 1);
+    structPtr->leftHeaderSprites[1]->oam.tileNum = GetSpriteTileStartByTag(2) + sPokenavMenuLeftHeaderSpriteSheets[index].size;
+
+    if (index == NAVGEAR_GFX_MAP_MENU_UNK0 || index == NAVGEAR_GFX_MAP_MENU_UNK1)
+        structPtr->leftHeaderSprites[1]->pos2.x = 56;
+    else
+        structPtr->leftHeaderSprites[1]->pos2.x = 64;
+}
+
+void LoadLeftHeaderGfxForSubMenu(u32 arg0)
+{
+    u32 size, tag;
+
+    if (arg0 >= NAVGEAR_GFX_MENUS_END - NAVGEAR_GFX_SUBMENUS_START)
+        return;
+
+    tag = sPokenavSubMenuLeftHeaderSpriteSheets[arg0].tag;
+    size = GetDecompressedDataSize(sPokenavSubMenuLeftHeaderSpriteSheets[arg0].data);
+    LoadPalette(&gPokenavLeftHeader_Pal[tag * 16], (IndexOfSpritePaletteTag(2) * 16) + 0x100, 0x20);
+    LZ77UnCompWram(sPokenavSubMenuLeftHeaderSpriteSheets[arg0].data, &gDecompressionBuffer[0x1000]);
+    RequestDma3Copy(&gDecompressionBuffer[0x1000], (void *)VRAM + 0x10800 + (GetSpriteTileStartByTag(2) * 32), size, 1);
+}
+
+void sub_81C7FA0(u32 arg0, bool32 arg1, bool32 arg2)
+{
+    u32 var;
+
+    if (!arg1)
+        var = 0x30;
+    else
+        var = 0x10;
+
+    if (arg0 < 6)
+        ShowLeftHeaderSprites(var, arg2);
+    else
+        ShowLeftHeaderSubmenuSprites(var, arg2);
+}
+
+void sub_81C7FC4(u32 arg0, bool32 arg1)
+{
+    if (arg0 < 6)
+        HideLeftHeaderSprites(arg1);
+    else
+        HideLeftHeaderSubmenuSprites(arg1);
+}
+
+void sub_81C7FDC(void)
+{
+    s32 i;
+    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
+
+    for (i = 0; i < (s32)ARRAY_COUNT(structPtr->leftHeaderSprites); i++)
+    {
+        structPtr->leftHeaderSprites[i]->invisible = TRUE;
+        structPtr->submenuLeftHeaderSprites[i]->invisible = TRUE;
+    }
+}
+
+bool32 sub_81C8010(void)
+{
+    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
+
+    if (structPtr->leftHeaderSprites[0]->callback == SpriteCallbackDummy && structPtr->submenuLeftHeaderSprites[0]->callback == SpriteCallbackDummy)
+        return FALSE;
+    else
+        return TRUE;
+}
+
+void ShowLeftHeaderSprites(u32 startY, bool32 isOnRightSide)
+{
+    s32 start, end, i;
+    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
+
+    if (!isOnRightSide)
+        start = -96, end = 32;
+    else
+        start = 256, end = 160;
+
+    for (i = 0; i < (s32)ARRAY_COUNT(structPtr->leftHeaderSprites); i++)
+    {
+        structPtr->leftHeaderSprites[i]->pos1.y = startY;
+        MoveLeftHeader(structPtr->leftHeaderSprites[i], start, end, 12);
+    }
+}
+
+void ShowLeftHeaderSubmenuSprites(u32 startY, bool32 isOnRightSide)
+{
+    s32 start, end, i;
+    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
+
+    if (!isOnRightSide)
+        start = -96, end = 16;
+    else
+        start = 256, end = 192;
+
+    for (i = 0; i < (s32)ARRAY_COUNT(structPtr->submenuLeftHeaderSprites); i++)
+    {
+        structPtr->submenuLeftHeaderSprites[i]->pos1.y = startY;
+        MoveLeftHeader(structPtr->submenuLeftHeaderSprites[i], start, end, 12);
+    }
+}
+
+void HideLeftHeaderSprites(bool32 isOnRightSide)
+{
+    s32 start, end, i;
+    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
+
+    if (!isOnRightSide)
+        start = 32, end = -96;
+    else
+        start = 192, end = 256;
+
+    for (i = 0; i < (s32)ARRAY_COUNT(structPtr->leftHeaderSprites); i++)
+    {
+        MoveLeftHeader(structPtr->leftHeaderSprites[i], start, end, 12);
+    }
+}
+
+void HideLeftHeaderSubmenuSprites(bool32 isOnRightSide)
+{
+    s32 start, end, i;
+    struct PokenavMainMenuResources *structPtr = GetSubstructPtr(0);
+
+    if (!isOnRightSide)
+        start = 16, end = -96;
+    else
+        start = 192, end = 256;
+
+    for (i = 0; i < (s32)ARRAY_COUNT(structPtr->submenuLeftHeaderSprites); i++)
+    {
+        MoveLeftHeader(structPtr->submenuLeftHeaderSprites[i], start, end, 12);
+    }
+}
+
+void MoveLeftHeader(struct Sprite *sprite, s32 startX, s32 endX, s32 duration)
+{
+    sprite->pos1.x = startX;
+    sprite->data[0] = startX * 16;
+    sprite->data[1] = (endX - startX) * 16 / duration;
+    sprite->data[2] = duration;
+    sprite->data[7] = endX;
+    sprite->callback = SpriteCB_MoveLeftHeader;
+}
+
+void SpriteCB_MoveLeftHeader(struct Sprite *sprite)
+{
+    if (sprite->data[2] != 0)
+    {
+        sprite->data[2]--;
+        sprite->data[0] += sprite->data[1];
+        sprite->pos1.x = sprite->data[0] >> 4;
+        if (sprite->pos1.x < -16 || sprite->pos1.x > 256)
+            sprite->invisible = TRUE;
+        else
+            sprite->invisible = FALSE;
+    }
+    else
+    {
+        sprite->pos1.x = sprite->data[7];
+        sprite->callback = SpriteCallbackDummy;
+    }
+}
diff --git a/src/pokenav_match_call.c b/src/pokenav_match_call_data.c
index 1f621922d..1f621922d 100644
--- a/src/pokenav_match_call.c
+++ b/src/pokenav_match_call_data.c
diff --git a/src/pokenav_match_call_ui.c b/src/pokenav_match_call_ui.c
new file mode 100644
index 000000000..7443c0bdb
--- /dev/null
+++ b/src/pokenav_match_call_ui.c
@@ -0,0 +1,1266 @@
+#include "global.h"
+#include "pokenav.h"
+#include "window.h"
+#include "strings.h"
+#include "text.h"
+#include "bg.h"
+#include "menu.h"
+#include "decompress.h"
+
+struct UnknownSubSubStruct_0203CF40 {
+    u8 bg;
+    u8 unk1;
+    u8 unk2;
+    u8 unk3;
+    u8 unk4;
+    u8 fontId;
+    u16 unk6;
+    u16 windowId;
+    u16 unkA;
+    u16 unkC;
+    u16 unkE;
+};
+
+struct MatchCallWindowState {
+    // The index of the element at the top of the window.
+    u16 windowTopIndex;
+    u16 listLength;
+    u16 unk4;
+    // The index of the cursor, relative to the top of the window.
+    u16 selectedIndexOffset;
+    u16 visibleEntries;
+    u16 unkA;
+    u32 unkC;
+    u32 unk10;
+};
+
+struct UnknownInnerStruct_81C81D4
+{
+    struct UnknownSubSubStruct_0203CF40 unk0;
+    u32 unk10;
+    u32 unk14;
+    u32 unk18;
+    u32 unk1C;
+    s32 unk20;
+    s32 unk24;
+    u32 unk28;
+    s32 unk2C;
+    u32 unk30;
+    void (*unk34)(u32, u8*);
+    void (*unk38)(u16, u32, u32);
+    struct Sprite *rightArrow;
+    struct Sprite *upArrow;
+    struct Sprite *downArrow;
+    u8 unkTextBuffer[0x40];
+};
+
+// Generally at index 0x11 (17)
+struct UnknownSubStruct_81C81D4
+{
+    struct UnknownInnerStruct_81C81D4 unk0;
+    u8 tilemapBuffer[0x800];
+    struct MatchCallWindowState unk888;
+    u32 unk89C;
+    u32 unk8A0;
+};
+
+struct MatchCallListTemplate
+{
+    u32 unk0;
+    u16 unk4;
+    u16 unk6;
+    u8 unk8;
+    u8 unk9;
+    u8 unkA;
+    u8 unkB;
+    u8 unkC;
+    u8 unkD;
+    u8 unkE;
+    void (*unk10)(u32, u8 *a1);
+    void (*unk14)(u16 a0, u32 a1, u32 a2);
+};
+
+extern void sub_81CBD48(u16 windowId, u32 a1);
+extern void sub_81DB620(u32 windowId, u32 a1, u32 a2, u32 a3, u32 a4);
+extern u8 *sub_81CAFD8(u16 a0, u32 a1);
+
+void sub_81C82E4(struct UnknownSubStruct_81C81D4 *a0);
+u32 sub_81C91AC(struct UnknownInnerStruct_81C81D4 *a0, const struct BgTemplate *a1, struct MatchCallListTemplate *a2, s32 a3);
+void sub_81C9160(struct MatchCallWindowState *a0, struct MatchCallListTemplate *a1);
+void SpriteCB_MatchCallUpArrow(struct Sprite *sprite);
+void SpriteCB_MatchCallDownArrow(struct Sprite *sprite);
+void SpriteCB_MatchCallRightArrow(struct Sprite *sprite);
+void ToggleMatchCallArrows(struct UnknownInnerStruct_81C81D4 *a0, u32 a1);
+void sub_81C8FE0(struct UnknownInnerStruct_81C81D4 *a0);
+void sub_81C8EF8(struct MatchCallWindowState *a0, struct UnknownInnerStruct_81C81D4 *a1);
+void sub_81C8ED0(void);
+void sub_81C8E54(struct MatchCallWindowState *a0, struct UnknownInnerStruct_81C81D4 *a1, u32 a2);
+void PrintMatchCallFieldNames(struct UnknownInnerStruct_81C81D4 *a0, u32 a1);
+void sub_81C8D4C(struct MatchCallWindowState *a0, struct UnknownInnerStruct_81C81D4 *a1);
+void sub_81C8CB4(struct MatchCallWindowState *a0, struct UnknownInnerStruct_81C81D4 *a1);
+void sub_81C8B70(struct UnknownSubSubStruct_0203CF40 *a0, u32 a1, u32 a2);
+void sub_81C8568(s32 a0, struct UnknownInnerStruct_81C81D4 *a1);
+void sub_81C83AC(u32 a0, u32 a1, u32 a2, u32 a3, u32 a4, struct UnknownInnerStruct_81C81D4 *a5);
+void sub_81C837C(struct MatchCallWindowState *a0, struct UnknownInnerStruct_81C81D4 *a1);
+void sub_81C835C(struct UnknownSubSubStruct_0203CF40 *a0);
+u32 LoopedTask_sub_81C8254(s32 a0);
+bool32 sub_81C83E0(void);
+u32 LoopedTask_sub_81C83F0(s32 a0);
+u32 LoopedTask_sub_81C85A0(s32 a0);
+u32 LoopedTask_sub_81C8870(s32 a0);
+u32 LoopedTask_sub_81C8A28(s32 a0);
+u32 LoopedTask_sub_81C8958(s32 a0);
+
+static const u16 sMatchcallArrowPaletteData[] = INCBIN_U16("graphics/pokenav/arrows_matchcall.gbapal");
+static const u32 sMatchcallArrowSpriteSheetData[] = INCBIN_U32("graphics/pokenav/arrows_matchcall.4bpp.lz");
+
+static const u8 sPokenavColors_0861FBE4[] =
+{
+    0, 2, 5
+};
+
+static const u8 *const sMatchCallFieldNames[] =
+{
+    gText_NavgearMatchCall_Strategy,
+    gText_NavgearMatchCall_TrainerPokemon,
+    gText_NavgearMatchCall_SelfIntroduction
+};
+
+static const u8 sMatchCallFieldColors[] =
+{
+    1, 4, 5
+};
+
+static const u8 sUnknown_0861FBF7[] =
+{
+    2, 4, 6, 7, 0
+};
+
+static const struct CompressedSpriteSheet sMatchcallArrowSpriteSheet[] =
+{
+    {
+        .data = sMatchcallArrowSpriteSheetData,
+        .size = 192,
+        .tag = 0xA
+    }
+};
+
+static const struct SpritePalette sMatchcallArrowPalette[] =
+{
+    {
+        .data = sMatchcallArrowPaletteData,
+        .tag = 0x14
+    },
+    {}
+};
+
+static const struct OamData sMatchCallRightArrowSpriteOam =
+{
+    .y = 0,
+    .affineMode = ST_OAM_AFFINE_OFF,
+    .objMode = ST_OAM_OBJ_NORMAL,
+    .bpp = ST_OAM_4BPP,
+    .shape = 2, //SPRITE_SHAPE(16x8),
+    .x = 0,
+    .size = 0, //SPRITE_SIZE(16x8),
+    .tileNum = 0,
+    .priority = 2,
+    .paletteNum = 0
+};
+
+static const struct SpriteTemplate sMatchCallRightArrowSprite =
+{
+    .tileTag = 0xA,
+    .paletteTag = 0x14,
+    .oam = &sMatchCallRightArrowSpriteOam,
+    .anims = gDummySpriteAnimTable,
+    .images = NULL,
+    .affineAnims = gDummySpriteAffineAnimTable,
+    .callback = SpriteCB_MatchCallRightArrow
+};
+
+static const struct OamData sMatchCallUpDownArrowSpriteOam =
+{
+    .y = 0,
+    .affineMode = ST_OAM_AFFINE_OFF,
+    .objMode = ST_OAM_OBJ_NORMAL,
+    .bpp = ST_OAM_4BPP,
+    .shape = 1, //SPRITE_SHAPE(8x16),
+    .x = 0,
+    .size = 0, //SPRITE_SIZE(8x16),
+    .tileNum = 0,
+    .priority = 2,
+    .paletteNum = 0
+};
+
+static const struct SpriteTemplate sMatchCallUpDownArrowSprite =
+{
+    .tileTag = 0xA,
+    .paletteTag = 0x14,
+    .oam = &sMatchCallUpDownArrowSpriteOam,
+    .anims = gDummySpriteAnimTable,
+    .images = NULL,
+    .affineAnims = gDummySpriteAffineAnimTable,
+    .callback = SpriteCallbackDummy
+};
+
+EWRAM_DATA u32 gUnknown_0203CF44 = 0;
+
+bool32 sub_81C81D4(const struct BgTemplate *arg0, struct MatchCallListTemplate *arg1, s32 arg2)
+{
+    u32 v1;
+    struct UnknownSubStruct_81C81D4 *structPtr;
+    
+    structPtr = AllocSubstruct(0x11, sizeof(struct UnknownSubStruct_81C81D4));
+
+    if (structPtr == NULL)
+        return FALSE;
+    
+    sub_81C9160(&structPtr->unk888, arg1);
+
+    v1 = sub_81C91AC(&structPtr->unk0, arg0, arg1, arg2);
+    if (v1 == 0)
+        return FALSE;
+    
+    CreateLoopedTask(LoopedTask_sub_81C8254, 6);
+    return TRUE;
+}
+
+bool32 sub_81C8224(void)
+{
+    return FuncIsActiveLoopedTask(LoopedTask_sub_81C8254);
+}
+
+void sub_81C8234(void)
+{
+    struct UnknownSubStruct_81C81D4 *structPtr;
+
+    structPtr = GetSubstructPtr(0x11);
+    sub_81C8FE0(&structPtr->unk0);
+    RemoveWindow(structPtr->unk0.unk0.windowId);
+    FreePokenavSubstruct(0x11);
+}
+
+u32 LoopedTask_sub_81C8254(s32 a0)
+{
+    struct UnknownSubStruct_81C81D4 *structPtr;
+
+    if (IsDma3ManagerBusyWithBgCopy())
+        return 2;
+    
+    structPtr = GetSubstructPtr(0x11);
+
+    switch (a0)
+    {
+        case 0:
+            sub_81C82E4(structPtr);
+            return 0;
+        case 1:
+            sub_81C835C(&structPtr->unk0.unk0);
+            return 0;
+        case 2:
+            sub_81C837C(&structPtr->unk888, &structPtr->unk0);
+            return 0;
+        case 3:
+            if (sub_81C83E0())
+            {
+                return 2;
+            }
+            else
+            {
+                sub_81C8ED0();
+                return 1;
+            }
+        case 4:
+            sub_81C8EF8(&structPtr->unk888, &structPtr->unk0);
+            return 4;
+        default:
+            return 4;
+    }
+}
+
+void sub_81C82E4(struct UnknownSubStruct_81C81D4 *a0)
+{
+    u16 v1 = (a0->unk0.unk0.unk1 << 12) | a0->unk0.unk0.unk6;
+    // TODO: When #553 is merged, use a PALETTE_NUM_TO_FILL_VALUE(1) macro here...
+    sub_8199DF0(a0->unk0.unk0.bg, 0x11, a0->unk0.unk0.unk6, 1);
+    // ...and PALETTE_NUM_TO_FILL_VALUE(4) here.
+    sub_8199DF0(a0->unk0.unk0.bg, 0x44, a0->unk0.unk0.unk6 + 1, 1);
+    SetBgTilemapBuffer(a0->unk0.unk0.bg, a0->tilemapBuffer);
+    FillBgTilemapBufferRect_Palette0(a0->unk0.unk0.bg, v1, 0, 0, 32, 32);
+    ChangeBgY(a0->unk0.unk0.bg, 0, 0);
+    ChangeBgX(a0->unk0.unk0.bg, 0, 0);
+    ChangeBgY(a0->unk0.unk0.bg, a0->unk0.unk0.unk3 << 11, 2);
+    CopyBgTilemapBufferToVram(a0->unk0.unk0.bg);
+}
+
+void sub_81C835C(struct UnknownSubSubStruct_0203CF40 *a0)
+{
+    FillWindowPixelBuffer(a0->windowId, PIXEL_FILL(1));
+    PutWindowTilemap(a0->windowId);
+    CopyWindowToVram(a0->windowId, 1);
+}
+
+void sub_81C837C(struct MatchCallWindowState *a0, struct UnknownInnerStruct_81C81D4 *a1)
+{
+    s32 v1;
+    s32 v2;
+
+    // TODO: Clean this up.
+    v1 = a0->listLength - a0->windowTopIndex;
+    v2 = a0->visibleEntries;
+    if (v1 > a0->visibleEntries)
+        v1 = v2;
+    sub_81C83AC(a0->unk10, a0->windowTopIndex, v1, a0->unkC, 0, a1);
+}
+
+void sub_81C83AC(u32 a0, u32 a1, u32 a2, u32 a3, u32 a4, struct UnknownInnerStruct_81C81D4 *a5)
+{
+    if (a2 == 0)
+        return;
+
+    a5->unk1C = a0 + a1 * a3;
+    a5->unk18 = a3;
+    a5->unk0.unkC = 0;
+    a5->unk0.unkE = a2;
+    a5->unk14 = a1;
+    a5->unk10 = a4;
+    CreateLoopedTask(LoopedTask_sub_81C83F0, 5);
+}
+
+bool32 sub_81C83E0(void)
+{
+    return FuncIsActiveLoopedTask(LoopedTask_sub_81C83F0);
+}
+
+u32 LoopedTask_sub_81C83F0(s32 a0)
+{
+    struct UnknownInnerStruct_81C81D4 *structPtr;
+    u32 v1;
+
+    structPtr = &((struct UnknownSubStruct_81C81D4*)GetSubstructPtr(0x11))->unk0;
+    switch (a0)
+    {
+    case 0:
+        v1 = (structPtr->unk0.unkA + structPtr->unk0.unkC + structPtr->unk10) & 0xF;
+        structPtr->unk34(structPtr->unk1C, structPtr->unkTextBuffer);
+        if (structPtr->unk38 != NULL)
+            // Accessing unk0.windowId as if it were a u16...?
+            // It's accessed as a u8 again in the very next line...
+            structPtr->unk38(*(u16*)(&structPtr->unk0.windowId), structPtr->unk14, v1);
+        
+        AddTextPrinterParameterized(structPtr->unk0.windowId, structPtr->unk0.fontId, structPtr->unkTextBuffer, 8, (v1 << 4) + 1, 255, NULL);
+        
+        if (++structPtr->unk0.unkC >= structPtr->unk0.unkE)
+        {
+            if (structPtr->unk38 != NULL)
+                CopyWindowToVram(structPtr->unk0.windowId, 3);
+            else
+                CopyWindowToVram(structPtr->unk0.windowId, 2);
+            return 0;
+        }
+        else
+        {
+            structPtr->unk1C += structPtr->unk18;
+            structPtr->unk14++;
+            return 3;
+        }
+    case 1:
+        if (IsDma3ManagerBusyWithBgCopy())
+            return 2;
+        else
+            return 4;
+    default:
+        return 4;
+    }
+}
+
+bool32 ShouldShowUpArrow(void)
+{
+    u16 v1;
+    s32 v2;
+    struct UnknownSubStruct_81C81D4 *structPtr;
+    structPtr = GetSubstructPtr(0x11);
+
+    return structPtr->unk888.windowTopIndex != 0;
+}
+
+bool32 ShouldShowDownArrow(void)
+{
+    struct MatchCallWindowState *subPtr;
+    struct UnknownSubStruct_81C81D4 *structPtr;
+    structPtr = GetSubstructPtr(0x11);
+    subPtr = &structPtr->unk888;
+    
+    return subPtr->windowTopIndex + subPtr->visibleEntries < subPtr->listLength;
+}
+
+
+#ifdef NONMATCHING
+// This has some register renaming issues (r4, r5, and r6 are all switched around), and
+// for some reason it's creating two copies of subPtr->unk0.
+// TODO: Now I know why it's making two copies - one of them is UnknownInnerStruct_81C81D4.
+void MatchCall_MoveWindow(s32 a0, bool32 a1)
+{
+    s32 v1;
+    struct MatchCallWindowState *subPtr;
+    struct UnknownSubStruct_81C81D4 *structPtr;
+    structPtr = GetSubstructPtr(0x11);
+    subPtr = &structPtr->unk888;
+
+    if (a0 < 0)
+    {
+        // This is where the issue is. subPtr->windowTopIndex is being stored in r1 and then copied to
+        // r2... and then r2 is read for the if statement, r1 is read for the function call,
+        // and then both are clobbered as expected. Between those two uses, no writes to r1/r2
+        // happen; it doesn't need to be duplicated/moved at all.
+        if (subPtr->windowTopIndex + a0 < 0)
+            v1 = -1 * subPtr->windowTopIndex;
+        else
+            v1 = a0;
+        if (a1)
+            sub_81C83AC(subPtr->unk10, subPtr->windowTopIndex + v1, v1 * -1, subPtr->unkC, v1, structPtr);
+    }
+    else if (a1)
+    {
+        
+        gUnknown_0203CF44 = subPtr->windowTopIndex + subPtr->visibleEntries;
+        if ((s32)(gUnknown_0203CF44) + a0 >= (s32)subPtr->listLength)
+            v1 = subPtr->listLength - gUnknown_0203CF44;
+        else
+            v1 = a0;
+        
+        sub_81C83AC(subPtr->unk10, gUnknown_0203CF44, v1, subPtr->unkC, subPtr->visibleEntries, structPtr);
+        // Needed to prevent GCC from combining the two sub_81C83AC calls.
+        asm("");
+    }
+    else
+    {
+        v1 = a0;
+    }
+    
+    sub_81C8568(v1, structPtr);
+    subPtr->windowTopIndex++;
+}
+#else
+NAKED
+void MatchCall_MoveWindow(s32 a0, bool32 a1)
+{
+    asm(".syntax unified\n\
+	push {r4-r7,lr}\n\
+	sub sp, 0x8\n\
+	adds r6, r0, 0\n\
+	adds r4, r1, 0\n\
+	movs r0, 0x11\n\
+	bl GetSubstructPtr\n\
+	adds r7, r0, 0\n\
+	ldr r0, =0x00000888\n\
+	adds r5, r7, r0\n\
+	cmp r6, 0\n\
+	bge _081C8524\n\
+	ldrh r1, [r5]\n\
+	adds r0, r1, r6\n\
+	cmp r0, 0\n\
+	bge _081C850A\n\
+	negs r6, r1\n\
+_081C850A:\n\
+	cmp r4, 0\n\
+	beq _081C854E\n\
+	ldr r0, [r5, 0x10]\n\
+	adds r1, r6\n\
+	negs r2, r6\n\
+	ldr r3, [r5, 0xC]\n\
+	str r6, [sp]\n\
+	str r7, [sp, 0x4]\n\
+	bl sub_81C83AC\n\
+	b _081C854E\n\
+	.pool\n\
+_081C8524:\n\
+	cmp r4, 0\n\
+	beq _081C854E\n\
+	ldr r2, =gUnknown_0203CF44\n\
+	ldrh r1, [r5]\n\
+	ldrh r0, [r5, 0x8]\n\
+	adds r4, r1, r0\n\
+	str r4, [r2]\n\
+	adds r0, r4, r6\n\
+	ldrh r1, [r5, 0x2]\n\
+	cmp r0, r1\n\
+	blt _081C853C\n\
+	subs r6, r1, r4\n\
+_081C853C:\n\
+	ldr r0, [r5, 0x10]\n\
+	ldr r3, [r5, 0xC]\n\
+	ldrh r1, [r5, 0x8]\n\
+	str r1, [sp]\n\
+	str r7, [sp, 0x4]\n\
+	adds r1, r4, 0\n\
+	adds r2, r6, 0\n\
+	bl sub_81C83AC\n\
+_081C854E:\n\
+	adds r0, r6, 0\n\
+	adds r1, r7, 0\n\
+	bl sub_81C8568\n\
+	ldrh r0, [r5]\n\
+	adds r0, r6\n\
+	strh r0, [r5]\n\
+	add sp, 0x8\n\
+	pop {r4-r7}\n\
+	pop {r0}\n\
+	bx r0\n\
+	.pool\n\
+    .syntax divided");
+}
+#endif
+
+void sub_81C8568(s32 a0, struct UnknownInnerStruct_81C81D4 *a1)
+{
+    a1->unk20 = GetBgY(a1->unk0.bg);
+    a1->unk24 = a1->unk20 + (a0 << 12);
+    if (a0 > 0)
+        a1->unk30 = 1;
+    else
+        a1->unk30 = 2;
+    a1->unk2C = a0;
+    a1->unk28 = CreateLoopedTask(LoopedTask_sub_81C85A0, 6);
+}
+
+u32 LoopedTask_sub_81C85A0(s32 a0)
+{
+    s32 y;
+    s32 v1;
+    bool32 flag;
+    struct UnknownInnerStruct_81C81D4 *structPtr;
+    structPtr = &((struct UnknownSubStruct_81C81D4 *)GetSubstructPtr(0x11))->unk0;
+    
+    switch (a0)
+    {
+    case 0:
+        if (sub_81C83E0() == FALSE)
+            return 1;
+        else
+            return 2;
+    case 1:
+        flag = FALSE;
+        y = GetBgY(structPtr->unk0.bg);
+        v1 = ChangeBgY(structPtr->unk0.bg, 0x1000, structPtr->unk30);
+        if (structPtr->unk30 == 2)
+        {
+            if ((y > structPtr->unk24 || y <= structPtr->unk20) && v1 <= structPtr->unk24)
+            {
+                flag = TRUE;
+            }
+        }
+        else
+        {
+            if ((y < structPtr->unk24 || y >= structPtr->unk20) && v1 >= structPtr->unk24)
+            {
+                flag = TRUE;
+            }
+        }
+        if (flag)
+        {
+            structPtr->unk0.unkA = (structPtr->unk0.unkA + structPtr->unk2C) & 0xF;
+            ChangeBgY(structPtr->unk0.bg, structPtr->unk24, 0);
+            return 4;
+        }
+        else
+        {
+            return 2;
+        }
+    default:
+        return 4;
+    }
+}
+
+bool32 sub_81C8630(void)
+{
+    struct UnknownSubStruct_81C81D4 *structPtr;
+    structPtr = GetSubstructPtr(0x11);
+    return IsLoopedTaskActive(structPtr->unk0.unk28);
+}
+
+struct MatchCallWindowState *GetMatchCallWindowStruct(void)
+{
+    struct UnknownSubStruct_81C81D4 *structPtr;
+    structPtr = GetSubstructPtr(0x11);
+    return &structPtr->unk888;
+}
+
+u32 MatchCall_MoveCursorUp(void)
+{
+    struct MatchCallWindowState *structPtr;
+    structPtr = GetMatchCallWindowStruct();
+
+    if (structPtr->selectedIndexOffset != 0)
+    {
+        structPtr->selectedIndexOffset--;
+        return 1;
+    }
+    else
+    {
+        if (ShouldShowUpArrow())
+        {
+            MatchCall_MoveWindow(-1, TRUE);
+            return 2;
+        }
+        else
+        {
+            return 0;
+        }
+    }
+}
+
+u32 MatchCall_MoveCursorDown(void)
+{
+    struct MatchCallWindowState *structPtr;
+    structPtr = GetMatchCallWindowStruct();
+
+    if (structPtr->windowTopIndex + structPtr->selectedIndexOffset < structPtr->listLength - 1)
+    {
+        if (structPtr->selectedIndexOffset < structPtr->visibleEntries - 1)
+        {
+            structPtr->selectedIndexOffset++;
+            return 1;
+        }
+        else if (!ShouldShowDownArrow())
+        {
+            return 0;
+        }
+    }
+    else
+    {
+        return 0;
+    }
+    MatchCall_MoveWindow(1, TRUE);
+    return 2;
+}
+
+u32 MatchCall_PageUp(void)
+{
+    struct MatchCallWindowState *structPtr;
+    s32 scroll;
+    
+    structPtr = GetMatchCallWindowStruct();
+    if (ShouldShowUpArrow())
+    {
+        if (structPtr->windowTopIndex >= structPtr->visibleEntries)
+            scroll = structPtr->visibleEntries;
+        else
+            scroll = structPtr->windowTopIndex;
+        MatchCall_MoveWindow(scroll * -1, TRUE);
+        return 2;
+    }
+    else if (structPtr->selectedIndexOffset != 0)
+    {
+        structPtr->selectedIndexOffset = 0;
+        return 1;
+    }
+    else
+    {
+        return 0;
+    }
+}
+
+u32 MatchCall_PageDown(void)
+{
+    struct MatchCallWindowState *structPtr;
+    structPtr = GetMatchCallWindowStruct();
+
+    if (ShouldShowDownArrow())
+    {
+        s32 scroll;
+        s32 windowBottomIndex;
+        s32 v3;
+        windowBottomIndex = structPtr->windowTopIndex + structPtr->visibleEntries;
+        scroll = structPtr->unk4 - structPtr->windowTopIndex;
+        if (windowBottomIndex <= structPtr->unk4)
+            scroll = structPtr->visibleEntries;
+        MatchCall_MoveWindow(scroll, TRUE);
+        return 2;
+    }
+    else
+    {
+        s32 cursor;
+        s32 lastVisibleIndex;
+        if (structPtr->listLength >= structPtr->visibleEntries)
+        {
+            cursor = structPtr->selectedIndexOffset;
+            lastVisibleIndex = structPtr->visibleEntries;
+        }
+        else
+        {
+            cursor = structPtr->selectedIndexOffset;
+            lastVisibleIndex = structPtr->listLength;
+        }
+        lastVisibleIndex -= 1;
+        if (cursor >= lastVisibleIndex)
+        {
+            return 0;
+        }
+        else
+        {
+            structPtr->selectedIndexOffset = lastVisibleIndex;
+            return 1;
+        }
+    }
+}
+
+u32 GetSelectedMatchCall(void)
+{
+    struct MatchCallWindowState *structPtr;
+    structPtr = GetMatchCallWindowStruct();
+
+    return structPtr->windowTopIndex + structPtr->selectedIndexOffset;
+}
+
+u32 GetMatchCallListTopIndex(void)
+{
+    struct MatchCallWindowState *structPtr;
+    structPtr = GetMatchCallWindowStruct();
+    
+    return structPtr->windowTopIndex;
+}
+
+void sub_81C877C(void)
+{
+    struct UnknownSubStruct_81C81D4 *structPtr;
+    structPtr = GetSubstructPtr(0x11);
+    structPtr->unk89C = 0;
+    structPtr->unk8A0 = CreateLoopedTask(LoopedTask_sub_81C8870, 6);
+}
+
+void sub_81C87AC(u16 a0)
+{
+    u16 temp;
+    struct UnknownSubStruct_81C81D4 *structPtr;
+    structPtr = GetSubstructPtr(0x11);
+    temp = structPtr->unk888.windowTopIndex;
+    temp += a0;
+    structPtr->unk888.windowTopIndex = temp;
+    structPtr->unk89C = 0;
+    structPtr->unk8A0 = CreateLoopedTask(LoopedTask_sub_81C8958, 6);
+}
+
+void sub_81C87F0(void)
+{
+    struct UnknownSubStruct_81C81D4 *structPtr;
+    structPtr = GetSubstructPtr(0x11);
+    structPtr->unk89C = 0;
+    structPtr->unk8A0 = CreateLoopedTask(LoopedTask_sub_81C8A28, 6);
+}
+
+bool32 sub_81C8820(void)
+{
+    struct UnknownSubStruct_81C81D4 *structPtr;
+    structPtr = GetSubstructPtr(0x11);
+    return IsLoopedTaskActive(structPtr->unk8A0);
+}
+
+void sub_81C8838(void)
+{
+    struct UnknownSubStruct_81C81D4 *structPtr;
+    struct MatchCallWindowState *subStr;
+    structPtr = GetSubstructPtr(0x11);
+    subStr = &structPtr->unk888;
+    structPtr->unk0.unk38(structPtr->unk0.unk0.windowId, subStr->windowTopIndex + subStr->selectedIndexOffset, (structPtr->unk0.unk0.unkA + subStr->selectedIndexOffset) & 0xF);
+    CopyWindowToVram(structPtr->unk0.unk0.windowId, 1);
+}
+
+u32 LoopedTask_sub_81C8870(s32 a0)
+{
+    struct UnknownSubStruct_81C81D4 *structPtr;
+    u16 v1;
+    u32 v2;
+
+    // Needed to fix a register renaming issue.
+    register u16* temp asm("r1");
+    structPtr = GetSubstructPtr(0x11);
+
+    switch (a0)
+    {
+    case 0:
+        ToggleMatchCallArrows(&structPtr->unk0, 1);
+        // fall-through
+    case 1:
+        if (structPtr->unk89C != structPtr->unk888.selectedIndexOffset)
+            sub_81C8B70(&structPtr->unk0.unk0, structPtr->unk89C, 1);
+        
+        structPtr->unk89C++;
+        return 0;
+    case 2:
+        if (IsDma3ManagerBusyWithBgCopy())
+            return 2;
+        
+        if (structPtr->unk89C != structPtr->unk888.visibleEntries)
+            return 6;
+        
+        if (structPtr->unk888.selectedIndexOffset != 0)
+            sub_81C8B70(&structPtr->unk0.unk0, structPtr->unk89C, structPtr->unk888.selectedIndexOffset);
+        
+        return 0;
+    case 3:
+        if (IsDma3ManagerBusyWithBgCopy())
+            return 2;
+        temp = &structPtr->unk888.selectedIndexOffset;
+        v1 = *temp;
+        if (v1 == 0)
+            return 4;
+        
+        MatchCall_MoveWindow(v1, FALSE);
+        return 0;
+    case 4:
+         v2 = sub_81C8630();
+         if (v2)
+            return 2;
+
+        structPtr->unk888.selectedIndexOffset = v2;
+        return 4;
+    default:
+        return 4;
+    }
+}
+
+u32 LoopedTask_sub_81C8958(s32 a0)
+{
+    struct UnknownSubStruct_81C81D4 *structPtr;
+    structPtr = GetSubstructPtr(0x11);
+    if (IsDma3ManagerBusyWithBgCopy())
+        return 2;
+    
+    switch (a0)
+    {
+    case 0:
+        sub_81C8CB4(&structPtr->unk888, &structPtr->unk0);
+        break;
+    case 1:
+        PrintMatchCallFieldNames(&structPtr->unk0, 0);
+        break;
+    case 2:
+        sub_81C8E54(&structPtr->unk888, &structPtr->unk0, 0);
+        break;
+    case 3:
+        PrintMatchCallFieldNames(&structPtr->unk0, 1);
+        break;
+    case 4:
+        sub_81C8E54(&structPtr->unk888, &structPtr->unk0, 1);
+        break;
+    case 5:
+        PrintMatchCallFieldNames(&structPtr->unk0, 2);
+        break;
+    case 6:
+        sub_81C8E54(&structPtr->unk888, &structPtr->unk0, 2);
+        break;
+    case 7:
+        sub_81C8E54(&structPtr->unk888, &structPtr->unk0, 3);
+        break;
+    default:
+        return 4;
+    }
+    return 0;
+}
+
+u32 LoopedTask_sub_81C8A28(s32 a0)
+{
+    struct UnknownSubStruct_81C81D4 *structPtr;
+    struct MatchCallWindowState *subPtr888;
+    register struct UnknownInnerStruct_81C81D4 *subPtr0 asm("r2");
+    s32 v4;
+
+    if (IsDma3ManagerBusyWithBgCopy())
+    {
+        return 2;
+    }
+    
+    structPtr = GetSubstructPtr(0x11);
+    subPtr888 = &structPtr->unk888;
+    subPtr0 = &structPtr->unk0;
+
+    switch (a0)
+    {
+    default:
+        return 4;
+    case 0:
+        sub_81C8D4C(subPtr888, subPtr0);
+        return 0;
+    case 1:
+    {
+        s32 v1;
+        s32 v2;
+        u32 *v3;
+        register s32 v4 asm("r5");
+
+        v3 = &structPtr->unk89C;
+        v1 = *v3 + 1;
+        *v3 = v1;
+        if (v1 < structPtr->unk888.visibleEntries)
+        {
+            sub_81C8B70(&subPtr0->unk0, v1, 1);
+            return 2;
+        }
+
+        *v3 = 0;
+        if (subPtr888->listLength <= subPtr888->visibleEntries)
+        {
+            register u32 temp asm("r0");
+            temp = subPtr888->windowTopIndex;
+            if (temp == 0)
+                return 9;
+            v2 = temp;
+        }
+        else
+        {
+            register s32 temp asm("r1");
+            v2 = subPtr888->windowTopIndex + subPtr888->visibleEntries;
+            temp = (s32)subPtr888->listLength;
+            if (v2 <= temp)
+                return 9;
+            v2 -= temp;
+        }
+        v4 = v2 * -1;
+        sub_81C8B70(&subPtr0->unk0, v4, v2);
+        subPtr888->selectedIndexOffset = v2;
+        *v3 = v4;
+        return 0;
+    }
+    case 2:
+        MatchCall_MoveWindow(structPtr->unk89C, FALSE);
+        return 0;
+    case 3:
+        if (sub_81C8630())
+            return 2;
+        
+        structPtr->unk89C = 0;
+        return 1;
+    case 4:
+        sub_81C83AC(subPtr888->unk10, subPtr888->windowTopIndex + structPtr->unk89C, 1, subPtr888->unkC, structPtr->unk89C, &structPtr->unk0);
+        return 0;
+    case 5:
+        if (sub_81C83E0())
+            return 2;
+        
+        v4 = ++structPtr->unk89C;
+        if (v4 >= subPtr888->listLength || v4 >= subPtr888->visibleEntries)
+            return 1;
+        return 9;
+    case 6:
+        ToggleMatchCallArrows(subPtr0, 0);
+        return 4;
+    }
+}
+
+void sub_81C8B70(struct UnknownSubSubStruct_0203CF40 *a0, u32 a1, u32 a2)
+{
+    u8 *v1;
+    u32 v2;
+
+    v1 = (u8*)GetWindowAttribute(a0->windowId, WINDOW_TILE_DATA);
+    v2 = a0->unk4 * 64;
+
+    a1 = (a0->unkA + a1) & 0xF;
+    if ((s32)(a1 + a2) <= 16)
+    {
+        CpuFastFill8(PIXEL_FILL(1), v1 + a1 * v2, a2 * v2);
+        CopyWindowToVram(a0->windowId, 2);
+    }
+    else
+    {
+        u32 v3;
+        u32 v4;
+
+        v3 = 16 - a1;
+        v4 = a2 - v3;
+
+        CpuFastFill8(PIXEL_FILL(1), v1 + a1 * v2, v3 * v2);
+        CpuFastFill8(PIXEL_FILL(1), v1, v4 * v2);
+        CopyWindowToVram(a0->windowId, 2);
+    }
+
+    a2 -= 1;
+    for (a2; a2 != -1; a1 = (a1 + 1) & 0xF, a2--)
+    {
+        sub_81CBD48(a0->windowId, a1);
+    }
+
+    CopyWindowToVram(a0->windowId, 1);
+}
+
+void sub_81C8C64(struct UnknownSubSubStruct_0203CF40 *a0, u32 a1)
+{
+    u16 *v1;
+    register u32 v2 asm("r0");
+    u32 v3;
+
+    v1 = (u16*)GetBgTilemapBuffer(GetWindowAttribute(a0->windowId, WINDOW_BG));
+
+    v1 = &v1[(a0->unkA << 6) + a0->unk2 - 1];
+
+    if (a1 != 0)
+    {
+        v2 = a0->unk1 << 12;
+        v3 = a0->unk6 + 1;
+    }
+    else
+    {
+        v2 = a0->unk1 << 12;
+        v3 = a0->unk6;
+    }
+    {
+        register u16 v5 asm("r1");
+        register u32 v6 asm("r0");
+        v6 = (v3 | v2);
+        v6 = v6 << 16;
+        v5 = v6 >> 16;
+        v1[0] = v5;
+        v1[0x20] = v5;
+    }
+}
+
+void sub_81C8CB4(struct MatchCallWindowState *a0, struct UnknownInnerStruct_81C81D4 *a1)
+{
+    u8 colors[3];
+
+
+    memcpy(colors, sPokenavColors_0861FBE4, ARRAY_COUNT(sPokenavColors_0861FBE4));
+
+    a1->unk34(a0->unk10 + a0->unkC * a0->windowTopIndex, a1->unkTextBuffer);
+    a1->unk38(a1->unk0.windowId, a0->windowTopIndex, a1->unk0.unkA);
+    FillWindowPixelRect(a1->unk0.windowId, PIXEL_FILL(4), 0, a1->unk0.unkA * 16, a1->unk0.unk4 * 8, 16);
+    AddTextPrinterParameterized3(a1->unk0.windowId, a1->unk0.fontId, 8, (a1->unk0.unkA * 16) + 1, colors, TEXT_SPEED_FF, a1->unkTextBuffer);
+    sub_81C8C64(&a1->unk0, 1);
+    CopyWindowRectToVram(a1->unk0.windowId, 3, 0, a1->unk0.unkA * 2, a1->unk0.unk4, 2);
+}
+
+void sub_81C8D4C(struct MatchCallWindowState *a0, struct UnknownInnerStruct_81C81D4 *a1)
+{
+    a1->unk34(a0->unk10 + a0->unkC * a0->windowTopIndex, a1->unkTextBuffer);
+    FillWindowPixelRect(a1->unk0.windowId, PIXEL_FILL(1), 0, a1->unk0.unkA * 16, a1->unk0.unk4 * 8, 16);
+    AddTextPrinterParameterized(a1->unk0.windowId, a1->unk0.fontId, a1->unkTextBuffer, 8, a1->unk0.unkA * 16 + 1, TEXT_SPEED_FF, NULL);
+    sub_81C8C64(&a1->unk0, 0);
+    CopyWindowToVram(a1->unk0.windowId, 3);
+}
+
+void PrintMatchCallFieldNames(struct UnknownInnerStruct_81C81D4 *a0, u32 fieldId)
+{
+    const u8 *fieldNames[3];
+    u8 colors[3];
+    u32 r4;
+    u32 r5;
+    u32 tmp;
+    u32 one;
+
+    memcpy(fieldNames, sMatchCallFieldNames, sizeof(sMatchCallFieldNames));
+    memcpy(colors, sMatchCallFieldColors, sizeof(sMatchCallFieldColors));
+
+    r4 = a0->unk0.unkA;
+    tmp = fieldId * 2 + 1;
+    r4 += tmp;
+    r4 &= 0xF;
+    FillWindowPixelRect(a0->unk0.windowId, PIXEL_FILL(1), 0, r4 << 4, a0->unk0.unk4, 16);
+    
+    // This is a fake match. It should be this:
+    // AddTextPrinterParameterized3(a0->unk0.windowId, 7, 2, r4 << 4 + 1, colors, TEXT_SPEED_FF, fieldNames[fieldId]);
+    // But the original GCC does some clever reuse of the `1` constant that the current GCC doesn't.
+    one = 1;
+    AddTextPrinterParameterized3(a0->unk0.windowId, 7, 2, (r4 << 4) + one, colors, one - 2, fieldNames[fieldId]);
+    CopyWindowRectToVram(a0->unk0.windowId, 2, 0, r4 << 1, a0->unk0.unk4, 2);
+}
+
+void sub_81C8E54(struct MatchCallWindowState *a0, struct UnknownInnerStruct_81C81D4 *a1, u32 a2)
+{
+    const u8 *str;
+    u32 r6;
+
+    r6 = (a1->unk0.unkA + sUnknown_0861FBF7[a2]) & 0xF;
+
+    str = sub_81CAFD8(a0->windowTopIndex, a2);
+    if (str != NULL) {
+        sub_81DB620(a1->unk0.windowId, 1, r6 * 2, a1->unk0.unk4 - 1, 2);
+        AddTextPrinterParameterized(a1->unk0.windowId, 7, str, 2, (r6 << 4) + 1, TEXT_SPEED_FF, NULL);
+        CopyWindowRectToVram(a1->unk0.windowId, 2, 0, r6 * 2, a1->unk0.unk4, 2);
+    }
+}
+
+void sub_81C8ED0(void)
+{
+    u32 i;
+    const struct CompressedSpriteSheet *ptr;
+    
+    for (i = 0, ptr = sMatchcallArrowSpriteSheet; i < ARRAY_COUNT(sMatchcallArrowSpriteSheet); ptr++, i++)
+    {
+        LoadCompressedSpriteSheet(ptr);
+    }
+    Pokenav_AllocAndLoadPalettes(sMatchcallArrowPalette);
+}
+
+void sub_81C8EF8(struct MatchCallWindowState *a0, struct UnknownInnerStruct_81C81D4 *a1)
+{
+    register u32 spriteId asm("r3");
+    s16 temp;
+
+    spriteId = (u8)CreateSprite(&sMatchCallRightArrowSprite, a1->unk0.unk2 * 8 + 3, (a1->unk0.unk3 + 1) * 8, 7);
+    a1->rightArrow = &gSprites[spriteId];
+
+    temp = a1->unk0.unk2 * 8 + (a1->unk0.unk4 - 1) * 4;
+    spriteId = (u8)CreateSprite(&sMatchCallUpDownArrowSprite, temp, a1->unk0.unk3 * 8 + a0->visibleEntries * 16, 7);
+    a1->downArrow = &gSprites[spriteId];
+    a1->downArrow->oam.tileNum += 2;
+    a1->downArrow->callback = SpriteCB_MatchCallDownArrow;
+
+    spriteId = (u8)CreateSprite(&sMatchCallUpDownArrowSprite, temp, a1->unk0.unk3 * 8, 7);
+    a1->upArrow = &gSprites[spriteId];
+    a1->upArrow->oam.tileNum += 4;
+    a1->upArrow->callback = SpriteCB_MatchCallUpArrow;
+}
+
+void sub_81C8FE0(struct UnknownInnerStruct_81C81D4 *a0)
+{
+    DestroySprite(a0->rightArrow);
+    DestroySprite(a0->upArrow);
+    DestroySprite(a0->downArrow);
+    FreeSpriteTilesByTag(0xA);
+    FreeSpritePaletteByTag(0x14);
+}
+
+void ToggleMatchCallArrows(struct UnknownInnerStruct_81C81D4 *a0, bool32 shouldHide)
+{
+    if (shouldHide)
+    {
+        a0->rightArrow->callback = SpriteCallbackDummy;
+        a0->upArrow->callback = SpriteCallbackDummy;
+        a0->downArrow->callback = SpriteCallbackDummy;
+    }
+    else
+    {
+        a0->rightArrow->callback = SpriteCB_MatchCallRightArrow;
+        a0->upArrow->callback = SpriteCB_MatchCallUpArrow;
+        a0->downArrow->callback = SpriteCB_MatchCallDownArrow;
+    }
+    a0->rightArrow->invisible = shouldHide;
+    a0->upArrow->invisible = shouldHide;
+    a0->downArrow->invisible = shouldHide;
+}
+
+void SpriteCB_MatchCallRightArrow(struct Sprite *sprite)
+{
+    struct UnknownSubStruct_81C81D4 *structPtr;
+    structPtr = GetSubstructPtr(0x11);
+    sprite->pos2.y = structPtr->unk888.selectedIndexOffset << 4;
+}
+
+void SpriteCB_MatchCallDownArrow(struct Sprite *sprite)
+{
+    if (sprite->data[7] == 0 && ShouldShowDownArrow())
+        sprite->invisible = FALSE;
+    else
+        sprite->invisible = TRUE;
+    
+    if (++sprite->data[0] > 3)
+    {
+        s16 offset;
+
+        sprite->data[0] = 0;
+        offset = (sprite->data[1] + 1) & 7;
+        sprite->data[1] = offset;
+        sprite->pos2.y = offset;
+    }
+}
+
+void SpriteCB_MatchCallUpArrow(struct Sprite *sprite)
+{
+    if (sprite->data[7] == 0 && ShouldShowUpArrow())
+        sprite->invisible = FALSE;
+    else
+        sprite->invisible = TRUE;
+    
+    if (++sprite->data[0] > 3)
+    {
+        s16 offset;
+
+        sprite->data[0] = 0;
+        offset = (sprite->data[1] + 1) & 7;
+        sprite->data[1] = offset;
+        sprite->pos2.y = -1 * offset;
+    }
+}
+
+void ToggleMatchCallVerticalArrows(bool32 shouldHide)
+{
+    struct UnknownSubStruct_81C81D4 *structPtr;
+    structPtr = GetSubstructPtr(0x11);
+    structPtr->unk0.upArrow->data[7] = shouldHide;
+    structPtr->unk0.downArrow->data[7] = shouldHide;
+}
+
+void sub_81C9160(struct MatchCallWindowState *a0, struct MatchCallListTemplate *a1)
+{
+    u32 unused1 = a0->unk10 = a1->unk0;
+    u32 v0 = a1->unk6;
+    u32 zero = 0;
+    u32 unused2 = a0->windowTopIndex = v0;
+    u32 v1 = a0->listLength = a1->unk4;
+
+    a0->unkC = a1->unk8;
+    a0->visibleEntries = a1->unkC;
+    if (a0->visibleEntries >= (u16)v1)
+    {
+        a0->windowTopIndex = 0;
+        a0->unk4 = 0;
+        a0->selectedIndexOffset = v0; 
+    }
+    else
+    {
+        s32 v2;
+        a0->unk4 = a0->listLength - a0->visibleEntries;
+        v2 = a0->windowTopIndex + a0->visibleEntries;
+        if (v2 > a0->listLength) {
+            a0->selectedIndexOffset = v2 - a0->listLength;
+            a0->windowTopIndex = v0 - a0->selectedIndexOffset;
+        }
+        else
+        {
+            a0->selectedIndexOffset = 0;
+        }
+    }
+}
+
+u32 sub_81C91AC(struct UnknownInnerStruct_81C81D4 *a0, const struct BgTemplate *a1, struct MatchCallListTemplate *a2, s32 a3)
+{
+    register u32 raw_bg asm("r4") = ((a1->bg) << 30);
+    u8 bg = raw_bg >> 30;
+    u32 unknown = 0;
+    struct WindowTemplate window;
+    u8 bg_again;
+
+    a0->unk0.bg = bg;
+    a0->unk0.unk6 = a3;
+    a0->unk34 = a2->unk10;
+    a0->unk38 = a2->unk14;
+    a0->unk0.unk1 = a2->unkD;
+    a0->unk0.unk2 = a2->unk9;
+    a0->unk0.unk3 = a2->unkB;
+    a0->unk0.unk4 = a2->unkA;
+    a0->unk0.fontId = a2->unkE;
+    
+    window.bg = raw_bg >> 30;
+    window.tilemapLeft = a2->unk9;
+    window.tilemapTop = 0;
+    window.width = a2->unkA;
+    window.height = 32;
+    window.paletteNum = a2->unkD;
+    window.baseBlock = a3 + 2;
+
+    a0->unk0.windowId = AddWindow(&window);
+    if (a0->unk0.windowId == 0xFF)
+    {
+        return 0;
+    }
+    else
+    {
+        a0->unk0.unkA = unknown;
+        a0->rightArrow = NULL;
+        a0->upArrow = NULL;
+        a0->downArrow = NULL;
+        return 1;
+    }
+}
\ No newline at end of file