start fldeffect cut

asm/fldeff_80F9BCC.s

@@ -467,7 +467,7 @@ _080F9F54:
 	thumb_func_start sub_80F9F5C
 sub_80F9F5C: @ 80F9F5C
 	push {lr}
-	ldr r0, =gUnknown_0203AB40
+	ldr r0, =gPlayerFacingPosition
 	ldr r1, =gMapHeader
 	ldr r1, [r1, 0x4]
 	bl sub_80E9608
@@ -572,7 +572,7 @@ sub_80FA004: @ 80FA004
 	lsrs r0, 24
 	cmp r0, 0x2
 	bne _080FA0AE
-	ldr r4, =gUnknown_0203AB40
+	ldr r4, =gPlayerFacingPosition
 	adds r1, r4, 0x2
 	adds r0, r4, 0
 	bl GetXYCoordsOneStepInFrontOfPlayer
@@ -590,10 +590,10 @@ sub_80FA004: @ 80FA004
 	cmp r0, 0x1
 	bne _080FA070
 	bl sub_80F9F5C
-	ldr r1, =gUnknown_03005DB0
+	ldr r1, =gFieldCallback2
-	ldr r0, =FieldCallback_Teleport
+	ldr r0, =FieldCallback_PrepareFadeInFromMenu
 	str r0, [r1]
-	ldr r1, =gUnknown_0203CEEC
+	ldr r1, =gPostMenuFieldCallback
 	ldr r0, =sub_80FA0DC
 	b _080FA0C0
 	.pool
@@ -605,10 +605,10 @@ _080FA070:
 	cmp r0, 0x1
 	bne _080FA0A0
 	bl sub_80F9F5C
-	ldr r1, =gUnknown_03005DB0
+	ldr r1, =gFieldCallback2
-	ldr r0, =FieldCallback_Teleport
+	ldr r0, =FieldCallback_PrepareFadeInFromMenu
 	str r0, [r1]
-	ldr r1, =gUnknown_0203CEEC
+	ldr r1, =gPostMenuFieldCallback
 	ldr r0, =sub_80FA1E8
 	b _080FA0C0
 	.pool
@@ -624,10 +624,10 @@ _080FA0AE:
 	b _080FA0C4
 _080FA0B2:
 	bl sub_80F9F5C
-	ldr r1, =gUnknown_03005DB0
+	ldr r1, =gFieldCallback2
-	ldr r0, =FieldCallback_Teleport
+	ldr r0, =FieldCallback_PrepareFadeInFromMenu
 	str r0, [r1]
-	ldr r1, =gUnknown_0203CEEC
+	ldr r1, =gPostMenuFieldCallback
 	ldr r0, =sub_80FA34C
 _080FA0C0:
 	str r0, [r1]
@@ -824,7 +824,7 @@ sub_80FA234: @ 80FA234
 	thumb_func_start sub_80FA248
 sub_80FA248: @ 80FA248
 	push {r4,lr}
-	ldr r1, =gUnknown_0203AB40
+	ldr r1, =gPlayerFacingPosition
 	movs r2, 0
 	ldrsh r0, [r1, r2]
 	movs r2, 0x2

asm/party_menu.s

@@ -10199,10 +10199,10 @@ _081B5714:
 	movs r0, 0x5
 	bl PlaySE
 _081B571A:
-	ldr r0, =gUnknown_03005DB0
+	ldr r0, =gFieldCallback2
 	movs r1, 0
 	str r1, [r0]
-	ldr r0, =gUnknown_0203CEEC
+	ldr r0, =gPostMenuFieldCallback
 	str r1, [r0]
 	adds r0, r4, 0
 	bl sub_81B1C1C
@@ -10213,8 +10213,8 @@ _081B572A:
 	.pool
 	thumb_func_end sub_81B56D8
 
-	thumb_func_start FieldCallback_Teleport
+	thumb_func_start FieldCallback_PrepareFadeInFromMenu
-FieldCallback_Teleport: @ 81B5738
+FieldCallback_PrepareFadeInFromMenu: @ 81B5738
 	push {lr}
 	bl pal_fill_black
 	ldr r0, =task_launch_hm_phase_2
@@ -10224,7 +10224,7 @@ FieldCallback_Teleport: @ 81B5738
 	pop {r1}
 	bx r1
 	.pool
-	thumb_func_end FieldCallback_Teleport
+	thumb_func_end FieldCallback_PrepareFadeInFromMenu
 
 	thumb_func_start task_launch_hm_phase_2
 task_launch_hm_phase_2: @ 81B5750
@@ -10241,7 +10241,7 @@ task_launch_hm_phase_2: @ 81B5750
 	lsls r0, 16
 	lsrs r0, 16
 	str r0, [r1]
-	ldr r0, =gUnknown_0203CEEC
+	ldr r0, =gPostMenuFieldCallback
 	ldr r0, [r0]
 	bl _call_via_r0
 	adds r0, r4, 0
@@ -10345,10 +10345,10 @@ sub_81B5820: @ 81B5820
 	lsrs r0, 24
 	cmp r0, 0x1
 	bne _081B585C
-	ldr r1, =gUnknown_03005DB0
+	ldr r1, =gFieldCallback2
-	ldr r0, =FieldCallback_Teleport
+	ldr r0, =FieldCallback_PrepareFadeInFromMenu
 	str r0, [r1]
-	ldr r1, =gUnknown_0203CEEC
+	ldr r1, =gPostMenuFieldCallback
 	ldr r0, =hm_surf_run_dp02scr
 	str r0, [r1]
 	movs r0, 0x1
@@ -10463,10 +10463,10 @@ hm_prepare_waterfall: @ 81B58F0
 	lsrs r0, 24
 	cmp r0, 0x1
 	bne _081B594C
-	ldr r1, =gUnknown_03005DB0
+	ldr r1, =gFieldCallback2
-	ldr r0, =FieldCallback_Teleport
+	ldr r0, =FieldCallback_PrepareFadeInFromMenu
 	str r0, [r1]
-	ldr r1, =gUnknown_0203CEEC
+	ldr r1, =gPostMenuFieldCallback
 	ldr r0, =hm2_waterfall
 	str r0, [r1]
 	movs r0, 0x1
@@ -10510,10 +10510,10 @@ sub_81B5974: @ 81B5974
 	b _081B599E
 	.pool
 _081B5990:
-	ldr r1, =gUnknown_03005DB0
+	ldr r1, =gFieldCallback2
-	ldr r0, =FieldCallback_Teleport
+	ldr r0, =FieldCallback_PrepareFadeInFromMenu
 	str r0, [r1]
-	ldr r1, =gUnknown_0203CEEC
+	ldr r1, =gPostMenuFieldCallback
 	ldr r0, =sub_81B5958
 	str r0, [r1]
 	movs r0, 0x1
@@ -17276,7 +17276,7 @@ sub_81B9354: @ 81B9354
 	sub sp, 0xC
 	lsls r0, 24
 	lsrs r0, 24
-	ldr r2, =gUnknown_03005DB0
+	ldr r2, =gFieldCallback2
 	ldr r1, =hm_add_c3_without_phase_2
 	str r1, [r2]
 	movs r1, 0
@@ -17308,7 +17308,7 @@ sub_81B9390: @ 81B9390
 	movs r0, 0xFF
 	strh r0, [r4]
 _081B93A6:
-	ldr r0, =gUnknown_03005DB0
+	ldr r0, =gFieldCallback2
 	ldr r1, =hm_add_c3_without_phase_2
 	str r1, [r0]
 	ldr r0, =CB2_ReturnToField
@@ -17417,7 +17417,7 @@ _081B9486:
 	ldr r1, =gSpecialVar_0x8004
 	ldrb r0, [r2]
 	strh r0, [r1]
-	ldr r1, =gUnknown_03005DB0
+	ldr r1, =gFieldCallback2
 	ldr r0, =hm_add_c3_without_phase_2
 	str r0, [r1]
 	ldr r0, =CB2_ReturnToField
@@ -17553,7 +17553,7 @@ _081B95A4:
 	lsrs r0, 24
 	strh r0, [r4]
 _081B95BA:
-	ldr r0, =gUnknown_03005DB0
+	ldr r0, =gFieldCallback2
 	ldr r1, =hm_add_c3_without_phase_2
 	str r1, [r0]
 	ldr r0, =CB2_ReturnToField

asm/pokemon_summary_screen.s

@@ -2070,7 +2070,7 @@ sub_81C4F44: @ 81C4F44
 	cmp r0, 0
 	bne _081C4F6E
 	bl overworld_free_bg_tilemaps
-	ldr r0, =gUnknown_03005DB0
+	ldr r0, =gFieldCallback2
 	ldr r1, =hm_add_c3_without_phase_2
 	str r1, [r0]
 	ldr r1, =CB2_ReturnToField

src/data/field_event_obj/event_object_graphics.h

@@ -1376,7 +1376,9 @@ const u32 gFieldEffectObjectPic_ShadowSmall[] = INCBIN_U32("graphics/event_objec
 const u32 gFieldEffectObjectPic_ShadowMedium[] = INCBIN_U32("graphics/event_objects/pics/effects/shadow_medium.4bpp");
 const u32 gFieldEffectObjectPic_ShadowLarge[] = INCBIN_U32("graphics/event_objects/pics/effects/shadow_large.4bpp");
 const u32 gFieldEffectObjectPic_ShadowExtraLarge[] = INCBIN_U32("graphics/event_objects/pics/effects/shadow_extra_large.4bpp");
-const u32 gUnknown_084F6D38[] = INCBIN_U32("graphics/event_objects/pics/effects/unknown_4F6D38/0.4bpp");
+const u32 filler_8368A08[0x48] = {};
+const u8 gFieldEffectPic_CutGrass[] = INCBIN_U8("graphics/event_objects/pics/effects/cut_grass.4bpp");
+const u32 gFieldEffectPic_CutGrass_Copy[] = INCBIN_U32("graphics/event_objects/pics/effects/cut_grass.4bpp");
 const u16 gFieldEffectObjectPalette6[] = INCBIN_U16("graphics/event_objects/palettes/field_effect_object_palette_06.gbapal");
 const u32 gFieldEffectObjectPic_Ripple_0[] = INCBIN_U32("graphics/event_objects/pics/effects/ripple/0.4bpp");
 const u32 gFieldEffectObjectPic_Ripple_1[] = INCBIN_U32("graphics/event_objects/pics/effects/ripple/1.4bpp");

src/field_tasks.c

@@ -623,7 +623,7 @@ static void PerStepCallback_8069F64(u8 taskId)
     {
         data[1] = x;
         data[2] = y;
-        if (MetatileBehavior_IsAsh(MapGridGetMetatileBehaviorAt(x, y)))
+        if (MetatileBehavior_IsAshGrass(MapGridGetMetatileBehaviorAt(x, y)))
         {
             if (MapGridGetMetatileIdAt(x, y) == 0x20a)
             {

src/fldeff_cut.c

@@ -1,19 +1,613 @@
-
-// Includes
 #include "global.h"
+#include "field_camera.h"
+#include "field_effect.h"
+#include "event_object_movement.h"
+#include "field_player_avatar.h"
+#include "fieldmap.h"
+#include "event_obj_lock.h"
+#include "metatile_behavior.h"
+#include "party_menu.h"
+#include "overworld.h"
+#include "script.h"
+#include "sound.h"
+#include "sprite.h"
+#include "task.h"
+#include "trig.h"
+#include "malloc.h"
+#include "constants/event_objects.h"
+#include "constants/songs.h"
+#include "constants/abilities.h"
 
-// Static type declarations
+// tileset 0 as first
+#define METATILE_ID_GRASS 0x1
+#define METATILE_ID_POKE_GRASS 0xD
 
-// Static RAM declarations
+#define METATILE_ID_POKE_GRASS_TREE_UP 0x25
+#define METATILE_ID_GRASS_TREE_UP 0xE
+
+#define METATILE_ID_POKE_GRASS_TREE_LEFT 0x1C6
+#define METATILE_ID_POKE_GRASS_TREE_RIGHT 0x1C7
+
+#define METATILE_ID_GRASS_TREE_LEFT 0x1CE
+#define METATILE_ID_GRASS_TREE_RIGHT 0x1CF
+
+#define METATILE_ID_POKE_TALL_GRASS 0x15
+
+// tileset 6 as second
+#define METATILE_ID_POKE_STEP_LAVA_GRASS 0x206
+#define METATILE_ID_POKE_LAVA_GRASS 0x207
+#define METATILE_ID_LAVA_FIELD 0x271
+
+// tileset 7 as second
+#define METATILE_ID_POKE_ASH_GRASS 0x20A
+#define METATILE_ID_POKE_STEP_ASH_GRASS 0x212
+#define METATILE_ID_ASH 0x218
+
+// tileset 8 as second
+#define METATILE_ID_POKE_TALL_GRASS_START 0x208
+
+#define METATILE_ID_SECRET_BASE_LEFT_TALL_GRASS 0x279
+#define METATILE_ID_SECRET_BASE_CENTER_TALL_GRASS 0x27A
+#define METATILE_ID_SECRET_BASE_RIGHT_TALL_GRASS 0x27B
+
+#define METATILE_ID_SECRET_BASE_LEFT_POKE_TALL_GRASS 0x281
+#define METATILE_ID_SECRET_BASE_CENTER_POKE_TALL_GRASS 0x282
+#define METATILE_ID_SECRET_BASE_RIGHT_POKE_TALL_GRASS 0x283
+
+extern bool8 SetLastTalkedObjectInFrontOfPlayer(u8);
+extern u8 oei_task_add(void);
+
+extern struct MapPosition gPlayerFacingPosition;
+extern u8 *gCutGrassSpriteArrayPtr;
+
+extern const u8 Route103_EventScript_290705[];
+extern const u8 gFieldEffectPic_CutGrass[];
+extern const u16 gFieldEffectObjectPalette6[];
+
+#define CUT_NORMAL_SIDE 3
+#define CUT_NORMAL_AREA CUT_NORMAL_SIDE * CUT_NORMAL_SIDE
+/* P - player
+   X - cut area
+
+    XXX
+    XPX
+    XXX
+*/
+
+#define CUT_HYPER_SIDE 5
+#define CUT_HYPER_AREA CUT_HYPER_SIDE * CUT_HYPER_SIDE
+/* P - player
+   X - cut area
+
+    XXXXX
+    XXXXX
+    XXPXX
+    XXXXX
+    XXXXX
+*/
 
 IWRAM_DATA u8 gUnknown_03001100;
 IWRAM_DATA u8 gUnknown_03001101;
 IWRAM_DATA u8 gUnknown_03001102;
 IWRAM_DATA u32 fldeff_cut_unused_03001104;
-IWRAM_DATA u8 gUnknown_03001108[25];
+IWRAM_DATA bool8 gUnknown_03001108[CUT_HYPER_AREA];
 
-// Static ROM declarations
+struct HyperCutterUnk
+{
+    s8 x;
+    s8 y;
+    u8 unk2[2];
+};
 
-// .rodata
+const struct HyperCutterUnk gUnknown_0857C608[] =
+{
+    {-2, -2, {1}},
+    {-1, -2, {1}},
+    {0, -2, {2}},
+    {1, -2, {3}},
+    {2, -2, {3}},
+    {-2, -1, {1}},
+    {2, -1, {3}},
+    {-2, 0, {4}},
+    {2, 0, {6}},
+    {-2, 1, {7}},
+    {2, 1, {9}},
+    {-2, 2, {7}},
+    {-1, 2, {7}},
+    {0, 2, {8}},
+    {1, 2, {9}},
+    {2, 2, {9}},
+};
 
-// .text
+const struct OamData gOamData_CutGrass =
+{
+    .y = 0,
+    .affineMode = 0,
+    .objMode = 0,
+    .mosaic = 0,
+    .bpp = 0,
+    .shape = 0,
+    .x = 0,
+    .matrixNum = 0,
+    .size = 0,
+    .tileNum = 1,
+    .priority = 1,
+    .paletteNum = 1,
+    .affineParam = 0,
+};
+
+const union AnimCmd gSpriteAnim_CutGrass[] =
+{
+    ANIMCMD_FRAME(0, 30),
+    ANIMCMD_JUMP(0),
+};
+
+const union AnimCmd *const gSpriteAnimTable_CutGrass[] =
+{
+    gSpriteAnim_CutGrass,
+};
+
+const struct SpriteFrameImage gSpriteImageTable_CutGrass[] =
+{
+    {gFieldEffectPic_CutGrass, 0x20},
+};
+
+const struct SpritePalette gFieldEffectObjectPaletteInfo6 = {gFieldEffectObjectPalette6, 0x1000};
+
+void FieldCallback_CutTree(void);
+void FieldCallback_CutGrass(void);
+void StartCutTreeFieldEffect(void);
+void StartCutGrassFieldEffect(void);
+void SetCutGrassMetatile(s16, s16);
+void SetCutGrassMetatiles(s16, s16);
+void CutGrassSpriteCallback1(struct Sprite *);
+void CutGrassSpriteCallback2(struct Sprite *);
+void CutGrassSpriteCallbackEnd(struct Sprite *);
+void HandleTallGrassOnHyper(u8, s16, s16);
+
+const struct SpriteTemplate gSpriteTemplate_CutGrass =
+{
+    .tileTag = 0xFFFF,
+    .paletteTag = 0x1000,
+    .oam = &gOamData_CutGrass,
+    .anims = gSpriteAnimTable_CutGrass,
+    .images = gSpriteImageTable_CutGrass,
+    .affineAnims = gDummySpriteAffineAnimTable,
+    .callback = CutGrassSpriteCallback1,
+};
+
+bool8 SetUpFieldMove_Cut(void)
+{
+    s16 x, y;
+    u8 i, j;
+    u8 tileBehavior;
+    u8 userAbility;
+    bool8 array[CUT_NORMAL_AREA];
+    bool8 ret;
+
+    if (SetLastTalkedObjectInFrontOfPlayer(EVENT_OBJ_GFX_CUTTABLE_TREE) == TRUE)
+    {
+        // Standing in front of cuttable tree.
+        gFieldCallback2 = FieldCallback_PrepareFadeInFromMenu;
+        gPostMenuFieldCallback = FieldCallback_CutTree;
+        return TRUE;
+    }
+    else
+    {
+        PlayerGetDestCoords(&gPlayerFacingPosition.x, &gPlayerFacingPosition.y);
+        userAbility = GetMonAbility(&gPlayerParty[GetCursorSelectionMonId()]);
+        if (userAbility == ABILITY_HYPER_CUTTER)
+        {
+            gUnknown_03001100 = 5;
+            gUnknown_03001101 = 2;
+            gUnknown_03001102 = 2;
+        }
+        else
+        {
+            gUnknown_03001100 = 3;
+            gUnknown_03001101 = 1;
+            gUnknown_03001102 = 1;
+        }
+
+        for (i = 0; i < CUT_NORMAL_AREA; i++)
+            array[i] = FALSE;
+        for (i = 0; i < CUT_HYPER_AREA; i++)
+            gUnknown_03001108[i] = FALSE;
+
+        ret = FALSE;
+
+        for (i = 0; i < 3; i++)
+        {
+            y = i - 1 + gPlayerFacingPosition.y;
+            for (j = 0; j < 3; j++)
+            {
+                x = j - 1 + gPlayerFacingPosition.x;
+                if (MapGridGetZCoordAt(x, y) == gPlayerFacingPosition.height)
+                {
+                    tileBehavior = MapGridGetMetatileBehaviorAt(x, y);
+                    if (MetatileBehavior_IsPokeGrass(tileBehavior) == TRUE
+                    || MetatileBehavior_IsAshGrass(tileBehavior) == TRUE)
+                    {
+                        // Standing in front of grass.
+                        gUnknown_03001108[6 + (i * 5) + j] = TRUE;
+                        ret = TRUE;
+                    }
+                    if (MapGridIsImpassableAt(x, y) == TRUE)
+                    {
+                        array[i * 3 + j] = FALSE;
+                    }
+                    else
+                    {
+                        array[i * 3 + j] = TRUE;
+                        if (MetatileBehavior_IsCuttableGrass(tileBehavior) == TRUE)
+                            gUnknown_03001108[6 + (i * 5) + j] = TRUE;
+                    }
+                }
+                else
+                {
+                    array[i * 3 + j] = FALSE;
+                }
+            }
+        }
+
+        if (userAbility != ABILITY_HYPER_CUTTER)
+        {
+            if (ret == TRUE)
+            {
+                gFieldCallback2 = FieldCallback_PrepareFadeInFromMenu;
+                gPostMenuFieldCallback = FieldCallback_CutGrass;
+            }
+        }
+        else
+        {
+            bool8 r7;
+            for (i = 0; i < 16; i++)
+            {
+                x = gPlayerFacingPosition.x + gUnknown_0857C608[i].x;
+                y = gPlayerFacingPosition.y + gUnknown_0857C608[i].y;
+                r7 = TRUE;
+
+                j = 0;
+                while (1)
+                {
+                    if (gUnknown_0857C608[i].unk2[j] == 0)
+                        break;
+                    if (array[(u8)(gUnknown_0857C608[i].unk2[j] - 1)] == FALSE)
+                    {
+                        r7 = FALSE;
+                        break;
+                    }
+                    if (++j >= 2)
+                        break;
+                }
+
+                if (r7 == TRUE)
+                {
+                    if (MapGridGetZCoordAt(x, y) == gPlayerFacingPosition.height)
+                    {
+                        u8 r6 = ((gUnknown_0857C608[i].y * 5) + 12) + (gUnknown_0857C608[i].x);
+                        tileBehavior = MapGridGetMetatileBehaviorAt(x, y);
+                        if (MetatileBehavior_IsPokeGrass(tileBehavior) == TRUE
+                        || MetatileBehavior_IsAshGrass(tileBehavior) == TRUE)
+                        {
+                            gFieldCallback2 = FieldCallback_PrepareFadeInFromMenu;
+                            gPostMenuFieldCallback = FieldCallback_CutGrass;
+                            gUnknown_03001108[r6] = r7;
+                            ret = TRUE;
+                        }
+                        else
+                        {
+                            if (MetatileBehavior_IsCuttableGrass(tileBehavior) == TRUE)
+                                gUnknown_03001108[r6] = TRUE;
+                        }
+                    }
+                }
+            }
+
+            if (ret == TRUE)
+            {
+                gFieldCallback2 = FieldCallback_PrepareFadeInFromMenu;
+                gPostMenuFieldCallback = FieldCallback_CutGrass;
+            }
+        }
+
+        return ret;
+    }
+}
+
+void FieldCallback_CutGrass(void)
+{
+    FieldEffectStart(FLDEFF_USE_CUT_ON_GRASS);
+    gFieldEffectArguments[0] = GetCursorSelectionMonId();
+}
+
+bool8 FldEff_UseCutOnGrass(void)
+{
+    u8 taskId = oei_task_add();
+
+    gTasks[taskId].data[8] = (u32)StartCutGrassFieldEffect >> 16;
+    gTasks[taskId].data[9] = (u32)StartCutGrassFieldEffect;
+    IncrementGameStat(GAME_STAT_USED_CUT);
+    return FALSE;
+}
+
+void FieldCallback_CutTree(void)
+{
+    gFieldEffectArguments[0] = GetCursorSelectionMonId();
+    ScriptContext1_SetupScript(Route103_EventScript_290705);
+}
+
+bool8 FldEff_UseCutOnTree(void)
+{
+    u8 taskId = oei_task_add();
+
+    gTasks[taskId].data[8] = (u32)StartCutTreeFieldEffect >> 16;
+    gTasks[taskId].data[9] = (u32)StartCutTreeFieldEffect;
+    IncrementGameStat(GAME_STAT_USED_CUT);
+    return FALSE;
+}
+
+void StartCutGrassFieldEffect(void)
+{
+    FieldEffectActiveListRemove(FLDEFF_USE_CUT_ON_GRASS);
+    FieldEffectStart(FLDEFF_CUT_GRASS);
+}
+
+bool8 FldEff_CutGrass(void)
+{
+    s16 x, y;
+    u8 tileBehavior;
+    u8 i;
+
+    for (i = 0, PlaySE(SE_W015), PlayerGetDestCoords(&gPlayerFacingPosition.x, &gPlayerFacingPosition.y); i < 25; i++)
+    {
+        if (gUnknown_03001108[i] == TRUE)
+        {
+            s8 xAdd = (i % 5) - 2;
+            s8 yAdd = (i / 5) - 2;
+
+            x = xAdd + gPlayerFacingPosition.x;
+            y = yAdd + gPlayerFacingPosition.y;
+
+            SetCutGrassMetatile(x, y);
+            sub_808E75C(x, y);
+        }
+    }
+
+    SetCutGrassMetatiles(gPlayerFacingPosition.x - gUnknown_03001101, gPlayerFacingPosition.y + (~gUnknown_03001102));
+    DrawWholeMapView();
+    gCutGrassSpriteArrayPtr = AllocZeroed(8);
+
+    // populate sprite ID array
+    for (i = 0; i < 8; i++)
+    {
+        gCutGrassSpriteArrayPtr[i] = CreateSprite(&gSpriteTemplate_CutGrass,
+        gSprites[gPlayerAvatar.spriteId].oam.x + 8, gSprites[gPlayerAvatar.spriteId].oam.y + 20, 0);
+        gSprites[gCutGrassSpriteArrayPtr[i]].data[2] = 32 * i;
+    }
+
+    return FALSE;
+}
+
+// set map grid metatile depending on x, y
+void SetCutGrassMetatile(s16 x, s16 y)
+{
+    s32 metatileId = MapGridGetMetatileIdAt(x, y);
+
+    switch (metatileId)
+    {
+    case METATILE_ID_POKE_TALL_GRASS_START:
+    case METATILE_ID_POKE_TALL_GRASS:
+    case METATILE_ID_POKE_GRASS:
+        MapGridSetMetatileIdAt(x, y, METATILE_ID_GRASS);
+        break;
+    case METATILE_ID_POKE_GRASS_TREE_LEFT:
+        MapGridSetMetatileIdAt(x, y, METATILE_ID_GRASS_TREE_LEFT);
+        break;
+    case METATILE_ID_POKE_GRASS_TREE_RIGHT:
+        MapGridSetMetatileIdAt(x, y, METATILE_ID_GRASS_TREE_RIGHT);
+        break;
+    case METATILE_ID_SECRET_BASE_LEFT_POKE_TALL_GRASS:
+        MapGridSetMetatileIdAt(x, y, METATILE_ID_SECRET_BASE_LEFT_TALL_GRASS);
+        break;
+    case METATILE_ID_SECRET_BASE_CENTER_POKE_TALL_GRASS:
+        MapGridSetMetatileIdAt(x, y, METATILE_ID_SECRET_BASE_CENTER_TALL_GRASS);
+        break;
+    case METATILE_ID_SECRET_BASE_RIGHT_POKE_TALL_GRASS:
+        MapGridSetMetatileIdAt(x, y, METATILE_ID_SECRET_BASE_RIGHT_TALL_GRASS);
+        break;
+    case METATILE_ID_POKE_STEP_LAVA_GRASS:
+    case METATILE_ID_POKE_LAVA_GRASS:
+        MapGridSetMetatileIdAt(x, y, METATILE_ID_LAVA_FIELD);
+        break;
+    case METATILE_ID_POKE_STEP_ASH_GRASS:
+    case METATILE_ID_POKE_ASH_GRASS:
+        MapGridSetMetatileIdAt(x, y, METATILE_ID_ASH);
+        break;
+    case METATILE_ID_POKE_GRASS_TREE_UP:
+        MapGridSetMetatileIdAt(x, y, METATILE_ID_GRASS_TREE_UP);
+        break;
+    }
+}
+
+enum
+{
+    TALL_GRASS_NONE,
+    TALL_GRASS_FIELD,
+    TALL_GRASS_BASE_LEFT,
+    TALL_GRASS_BASE_CENTER,
+    TALL_GRASS_BASE_RIGHT
+};
+
+u8 GetTallGrassCaseAt(s16 x, s16 y)
+{
+    u16 metatileId = MapGridGetMetatileIdAt(x, y);
+
+    if (metatileId == METATILE_ID_GRASS)
+        return TALL_GRASS_FIELD;
+    else if (metatileId == METATILE_ID_SECRET_BASE_LEFT_TALL_GRASS)
+        return TALL_GRASS_BASE_LEFT;
+    else if (metatileId == METATILE_ID_SECRET_BASE_CENTER_TALL_GRASS)
+        return TALL_GRASS_BASE_CENTER;
+    else if (metatileId == METATILE_ID_SECRET_BASE_RIGHT_TALL_GRASS)
+        return TALL_GRASS_BASE_RIGHT;
+    else
+        return TALL_GRASS_NONE;
+}
+
+void SetCutGrassMetatiles(s16 x, s16 y)
+{
+    s16 i;
+    s16 lowerY = y + gUnknown_03001100;
+
+    for (i = 0; i < gUnknown_03001100; i++)
+    {
+        s16 currentX = x + i;
+        if (MapGridGetMetatileIdAt(currentX, y) == METATILE_ID_POKE_TALL_GRASS)
+        {
+            switch (GetTallGrassCaseAt(currentX, y + 1))
+            {
+            case TALL_GRASS_FIELD:
+                MapGridSetMetatileIdAt(currentX, y + 1, METATILE_ID_POKE_TALL_GRASS_START);
+                break;
+            case TALL_GRASS_BASE_LEFT:
+                MapGridSetMetatileIdAt(currentX, y + 1, METATILE_ID_SECRET_BASE_LEFT_POKE_TALL_GRASS);
+                break;
+            case TALL_GRASS_BASE_CENTER:
+                MapGridSetMetatileIdAt(currentX, y + 1, METATILE_ID_SECRET_BASE_CENTER_POKE_TALL_GRASS);
+                break;
+            case TALL_GRASS_BASE_RIGHT:
+                MapGridSetMetatileIdAt(currentX, y + 1, METATILE_ID_SECRET_BASE_RIGHT_POKE_TALL_GRASS);
+                break;
+            }
+        }
+        if (MapGridGetMetatileIdAt(currentX, lowerY) == METATILE_ID_GRASS)
+        {
+            if (MapGridGetMetatileIdAt(currentX, lowerY + 1) == METATILE_ID_POKE_TALL_GRASS_START)
+                MapGridSetMetatileIdAt(currentX, lowerY + 1, METATILE_ID_GRASS);
+            if (MapGridGetMetatileIdAt(currentX, lowerY + 1) == METATILE_ID_SECRET_BASE_LEFT_POKE_TALL_GRASS)
+                MapGridSetMetatileIdAt(currentX, lowerY + 1, METATILE_ID_SECRET_BASE_LEFT_TALL_GRASS);
+            if (MapGridGetMetatileIdAt(currentX, lowerY + 1) == METATILE_ID_SECRET_BASE_CENTER_POKE_TALL_GRASS)
+                MapGridSetMetatileIdAt(currentX, lowerY + 1, METATILE_ID_SECRET_BASE_CENTER_TALL_GRASS);
+            if (MapGridGetMetatileIdAt(currentX, lowerY + 1) == METATILE_ID_SECRET_BASE_RIGHT_POKE_TALL_GRASS)
+                MapGridSetMetatileIdAt(currentX, lowerY + 1, METATILE_ID_SECRET_BASE_RIGHT_TALL_GRASS);
+        }
+    }
+
+    if (gUnknown_03001100 == CUT_HYPER_SIDE)
+    {
+        HandleTallGrassOnHyper(0, x, y);
+        HandleTallGrassOnHyper(1, x, y);
+    }
+}
+
+void HandleTallGrassOnHyper(u8 caseId, s16 x, s16 y)
+{
+    s16 newX;
+    bool8 arr[3];
+
+    if (caseId == 0)
+    {
+        arr[0] = gUnknown_03001108[5];
+        arr[1] = gUnknown_03001108[10];
+        arr[2] = gUnknown_03001108[15];
+        newX = x;
+    }
+    else if (caseId == 1)
+    {
+        arr[0] = gUnknown_03001108[9];
+        arr[1] = gUnknown_03001108[14];
+        arr[2] = gUnknown_03001108[19];
+        newX = x + 4;
+    }
+    else // invalid case
+    {
+        return;
+    }
+
+    if (arr[0] == TRUE)
+    {
+        if (MapGridGetMetatileIdAt(newX, y + 3) == METATILE_ID_POKE_TALL_GRASS_START)
+            MapGridSetMetatileIdAt(newX, y + 3, METATILE_ID_GRASS);
+        if (MapGridGetMetatileIdAt(newX, y + 3) == METATILE_ID_SECRET_BASE_LEFT_POKE_TALL_GRASS)
+            MapGridSetMetatileIdAt(newX, y + 3, METATILE_ID_SECRET_BASE_LEFT_TALL_GRASS);
+        if (MapGridGetMetatileIdAt(newX, y + 3) == METATILE_ID_SECRET_BASE_CENTER_POKE_TALL_GRASS)
+            MapGridSetMetatileIdAt(newX, y + 3, METATILE_ID_SECRET_BASE_CENTER_TALL_GRASS);
+        if (MapGridGetMetatileIdAt(newX, y + 3) == METATILE_ID_SECRET_BASE_RIGHT_POKE_TALL_GRASS)
+            MapGridSetMetatileIdAt(newX, y + 3, METATILE_ID_SECRET_BASE_RIGHT_TALL_GRASS);
+    }
+    if (arr[1] == TRUE)
+    {
+        if (MapGridGetMetatileIdAt(newX, y + 2) == METATILE_ID_POKE_TALL_GRASS)
+        {
+            switch (GetTallGrassCaseAt(newX, y + 3))
+            {
+            case TALL_GRASS_FIELD:
+                MapGridSetMetatileIdAt(newX, y + 3, METATILE_ID_POKE_TALL_GRASS_START);
+                break;
+            case TALL_GRASS_BASE_LEFT:
+                MapGridSetMetatileIdAt(newX, y + 3, METATILE_ID_SECRET_BASE_LEFT_POKE_TALL_GRASS);
+                break;
+            case TALL_GRASS_BASE_CENTER:
+                MapGridSetMetatileIdAt(newX, y + 3, METATILE_ID_SECRET_BASE_CENTER_POKE_TALL_GRASS);
+                break;
+            case TALL_GRASS_BASE_RIGHT:
+                MapGridSetMetatileIdAt(newX, y + 3, METATILE_ID_SECRET_BASE_RIGHT_POKE_TALL_GRASS);
+                break;
+            }
+        }
+
+        if (MapGridGetMetatileIdAt(newX, y + 4) == METATILE_ID_POKE_TALL_GRASS_START)
+            MapGridSetMetatileIdAt(newX, y + 4, METATILE_ID_GRASS);
+        if (MapGridGetMetatileIdAt(newX, y + 4) == METATILE_ID_SECRET_BASE_LEFT_POKE_TALL_GRASS)
+            MapGridSetMetatileIdAt(newX, y + 4, METATILE_ID_SECRET_BASE_LEFT_TALL_GRASS);
+        if (MapGridGetMetatileIdAt(newX, y + 4) == METATILE_ID_SECRET_BASE_CENTER_POKE_TALL_GRASS)
+            MapGridSetMetatileIdAt(newX, y + 4, METATILE_ID_SECRET_BASE_CENTER_TALL_GRASS);
+        if (MapGridGetMetatileIdAt(newX, y + 4) == METATILE_ID_SECRET_BASE_RIGHT_POKE_TALL_GRASS)
+            MapGridSetMetatileIdAt(newX, y + 4, METATILE_ID_SECRET_BASE_RIGHT_TALL_GRASS);
+    }
+    if (arr[2] == TRUE)
+    {
+        if (MapGridGetMetatileIdAt(newX, y + 3) == METATILE_ID_POKE_TALL_GRASS)
+        {
+            switch (GetTallGrassCaseAt(newX, y + 4))
+            {
+            case TALL_GRASS_FIELD:
+                MapGridSetMetatileIdAt(newX, y + 4, METATILE_ID_POKE_TALL_GRASS_START);
+                break;
+            case TALL_GRASS_BASE_LEFT:
+                MapGridSetMetatileIdAt(newX, y + 4, METATILE_ID_SECRET_BASE_LEFT_POKE_TALL_GRASS);
+                break;
+            case TALL_GRASS_BASE_CENTER:
+                MapGridSetMetatileIdAt(newX, y + 4, METATILE_ID_SECRET_BASE_CENTER_POKE_TALL_GRASS);
+                break;
+            case TALL_GRASS_BASE_RIGHT:
+                MapGridSetMetatileIdAt(newX, y + 4, METATILE_ID_SECRET_BASE_RIGHT_POKE_TALL_GRASS);
+                break;
+            }
+        }
+    }
+}
+
+void CutGrassSpriteCallback1(struct Sprite *sprite)
+{
+    sprite->data[0] = 8;
+    sprite->data[1] = 0;
+    sprite->data[3] = 0;
+    sprite->callback = CutGrassSpriteCallback2;
+}
+
+void CutGrassSpriteCallback2(struct Sprite *sprite)
+{
+    sprite->pos2.x = Sin(sprite->data[2], sprite->data[0]);
+    sprite->pos2.y = Cos(sprite->data[2], sprite->data[0]);
+
+    sprite->data[2] = (sprite->data[2] + 8) & 0xFF;
+    sprite->data[0] += 1 + (sprite->data[3] >> 2); // right shift by 2 is dividing by 4
+    sprite->data[3]++;
+
+    if (sprite->data[1] != 28)
+        sprite->data[1]++;
+    else
+        sprite->callback = CutGrassSpriteCallbackEnd; // done rotating the grass, execute clean up function
+}

src/fldeff_flash.c

@@ -78,14 +78,14 @@ bool8 SetUpFieldMove_Flash(void)
     if (ShouldDoBrailleFlyEffect())
     {
         gSpecialVar_Result = GetCursorSelectionMonId();
-        gUnknown_03005DB0 = FieldCallback_Teleport;
+        gFieldCallback2 = FieldCallback_PrepareFadeInFromMenu;
-        gUnknown_0203CEEC = sub_8179918;
+        gPostMenuFieldCallback = sub_8179918;
         return TRUE;
     }
     else if (gMapHeader.cave == TRUE && !FlagGet(FLAG_SYS_USE_FLASH))
     {
-        gUnknown_03005DB0 = FieldCallback_Teleport;
+        gFieldCallback2 = FieldCallback_PrepareFadeInFromMenu;
-        gUnknown_0203CEEC = hm2_flash;
+        gPostMenuFieldCallback = hm2_flash;
         return TRUE;
     }
 

src/fldeff_strength.c

@@ -14,11 +14,11 @@ static void sub_8145E74(void);
 // text
 bool8 SetUpFieldMove_Strength(void)
 {
-    if (npc_before_player_of_type(87) == TRUE)
+    if (SetLastTalkedObjectInFrontOfPlayer(87) == TRUE)
     {
         gSpecialVar_Result = GetCursorSelectionMonId();
-        gUnknown_03005DB0 = FieldCallback_Teleport;
+        gFieldCallback2 = FieldCallback_PrepareFadeInFromMenu;
-        gUnknown_0203CEEC = FldEff_UseStrength;
+        gPostMenuFieldCallback = FldEff_UseStrength;
         return TRUE;
     }
     return FALSE;

src/fldeff_sweetscent.c

@@ -24,8 +24,8 @@ void sub_81BE72C(void);
 
 bool8 SetUpFieldMove_SweetScent(void)
 {
-    gUnknown_03005DB0 = FieldCallback_Teleport;
+    gFieldCallback2 = FieldCallback_PrepareFadeInFromMenu;
-    gUnknown_0203CEEC = hm2_sweet_scent;
+    gPostMenuFieldCallback = hm2_sweet_scent;
     return TRUE;
 }
 

src/fldeff_teleport.c

@@ -11,8 +11,8 @@ bool8 SetUpFieldMove_Teleport(void)
 {
     if (Overworld_MapTypeAllowsTeleportAndFly(gMapHeader.mapType) == TRUE)
     {
-        gUnknown_03005DB0 = FieldCallback_Teleport;
+        gFieldCallback2 = FieldCallback_PrepareFadeInFromMenu;
-        gUnknown_0203CEEC = hm_teleport_run_dp02scr;
+        gPostMenuFieldCallback = hm_teleport_run_dp02scr;
         return TRUE;
     }
     return FALSE;

src/metatile_behavior.c

@@ -846,7 +846,7 @@ bool8 MetatileBehavior_IsBerryTreeSoil(u8 var)
         return FALSE;
 }
 
-bool8 MetatileBehavior_IsAsh(u8 var)
+bool8 MetatileBehavior_IsAshGrass(u8 var)
 {
     if (var == MB_ASHGRASS)
         return TRUE;

src/overworld.c

@@ -88,7 +88,7 @@ extern const u16 gUnknown_82EC7C4[];
 
 u16 gUnknown_03005DA8;
 MainCallback gFieldCallback;
-bool8 (*gUnknown_03005DB0)(void);
+bool8 (*gFieldCallback2)(void);
 u8 gUnknown_03005DB4;
 u8 gFieldLinkPlayerCount;
 
@@ -1518,15 +1518,15 @@ void sub_8085E94(void *a0)
 
 static bool8 map_post_load_hook_exec(void)
 {
-    if (gUnknown_03005DB0 != NULL)
+    if (gFieldCallback2 != NULL)
     {
-        if (!gUnknown_03005DB0())
+        if (!gFieldCallback2())
         {
             return FALSE;
         }
         else
         {
-            gUnknown_03005DB0 = NULL;
+            gFieldCallback2 = NULL;
             gFieldCallback = NULL;
         }
     }
@@ -1554,7 +1554,7 @@ void CB2_NewGame(void)
     ScriptContext1_Init();
     ScriptContext2_Disable();
     gFieldCallback = ExecuteTruckSequence;
-    gUnknown_03005DB0 = NULL;
+    gFieldCallback2 = NULL;
     do_load_map_stuff_loop(&gMain.state);
     SetFieldVBlankCallback();
     SetMainCallback1(CB1_Overworld);
@@ -1684,7 +1684,7 @@ void c2_8056854(void)
 void CB2_ReturnToFieldWithOpenMenu(void)
 {
     FieldClearVBlankHBlankCallbacks();
-    gUnknown_03005DB0 = sub_80AF6A4;
+    gFieldCallback2 = sub_80AF6A4;
     CB2_ReturnToField();
 }
 

src/rom6.c

@@ -27,16 +27,16 @@ static void hm2_dig(void);
 static void sub_8135780(void);
 
 // extern RAM loc
-extern struct MapPosition gUnknown_0203AB40;
+extern struct MapPosition gPlayerFacingPosition;
 
 // text
-bool8 npc_before_player_of_type(u8 a)
+bool8 SetLastTalkedObjectInFrontOfPlayer(u8 a)
 {
     u8 eventObjId;
 
-    GetXYCoordsOneStepInFrontOfPlayer(&gUnknown_0203AB40.x, &gUnknown_0203AB40.y);
+    GetXYCoordsOneStepInFrontOfPlayer(&gPlayerFacingPosition.x, &gPlayerFacingPosition.y);
-    gUnknown_0203AB40.height = PlayerGetZCoord();
+    gPlayerFacingPosition.height = PlayerGetZCoord();
-    eventObjId = GetEventObjectIdByXYZ(gUnknown_0203AB40.x, gUnknown_0203AB40.y, gUnknown_0203AB40.height);
+    eventObjId = GetEventObjectIdByXYZ(gPlayerFacingPosition.x, gPlayerFacingPosition.y, gPlayerFacingPosition.height);
     if (gEventObjects[eventObjId].graphicsId != a)
     {
         return FALSE;
@@ -50,7 +50,7 @@ bool8 npc_before_player_of_type(u8 a)
 
 u8 oei_task_add(void)
 {
-    GetXYCoordsOneStepInFrontOfPlayer(&gUnknown_0203AB40.x, &gUnknown_0203AB40.y);
+    GetXYCoordsOneStepInFrontOfPlayer(&gPlayerFacingPosition.x, &gPlayerFacingPosition.y);
     return CreateTask(task08_080C9820, 8);
 }
 
@@ -121,14 +121,14 @@ bool8 SetUpFieldMove_RockSmash(void)
     if(ShouldDoBrailleStrengthEffect())
     {
         gSpecialVar_Result = GetCursorSelectionMonId();
-        gUnknown_03005DB0 = FieldCallback_Teleport;
+        gFieldCallback2 = FieldCallback_PrepareFadeInFromMenu;
-        gUnknown_0203CEEC = sub_8179834;
+        gPostMenuFieldCallback = sub_8179834;
         return TRUE;
     }
-    else if (npc_before_player_of_type(0x56) == TRUE)
+    else if (SetLastTalkedObjectInFrontOfPlayer(0x56) == TRUE)
     {
-        gUnknown_03005DB0 = FieldCallback_Teleport;
+        gFieldCallback2 = FieldCallback_PrepareFadeInFromMenu;
-        gUnknown_0203CEEC = sub_81356C4;
+        gPostMenuFieldCallback = sub_81356C4;
         return TRUE;
     }
     else
@@ -164,8 +164,8 @@ bool8 SetUpFieldMove_Dig(void)
 {
     if (CanUseEscapeRopeOnCurrMap() == TRUE)
     {
-        gUnknown_03005DB0 = FieldCallback_Teleport;
+        gFieldCallback2 = FieldCallback_PrepareFadeInFromMenu;
-        gUnknown_0203CEEC = hm2_dig;
+        gPostMenuFieldCallback = hm2_dig;
         return TRUE;
     }
     else

src/start_menu.c

@@ -530,7 +530,7 @@ void sub_809FA18(void) // Called from field_screen.s
 {
     sUnknown_02037619[0] = 0;
     sUnknown_02037619[1] = 0;
-    gUnknown_03005DB0 = sub_809FA00;
+    gFieldCallback2 = sub_809FA00;
 }
 
 void sub_809FA34(u8 taskId) // Referenced in field_screen.s and rom_8011DC0.s