Merge pull request #216 from KDSKardabox/master

Decompile Ground Shake, Fossil Special & Flash

1 files changed, 770 insertions, 0 deletions

diff --git a/src/fossil_specials.c b/src/fossil_specials.c
new file mode 100644
index 000000000..95fafc17b
--- /dev/null
+++ b/src/fossil_specials.c
@@ -0,0 +1,770 @@
+#include "global.h"
+#include "constants/flags.h"
+#include "constants/songs.h"
+#include "bg.h"
+#include "event_data.h"
+#include "field_camera.h"
+#include "field_map_obj.h"
+#include "fieldmap.h"
+#include "global.fieldmap.h"
+#include "gpu_regs.h"
+#include "malloc.h"
+#include "menu.h"
+#include "random.h"
+#include "script.h"
+#include "sound.h"
+#include "sprite.h"
+#include "task.h"
+#include "window.h"
+
+#define MIRAGE_TOWER_GFX_LENGTH (sizeof(gUnknown_08617274) + sizeof(gMirageTower_Gfx))
+#define MIRAGE_TOWER_PALETTE_LENGTH 0x800
+#define ROOT_FOSSIL_GFX_LENGTH sizeof(gRootFossil_Gfx)
+#define ROOT_FOSSIL_GFX_RANDOMIZER_LENGTH 0x100
+
+//struct
+struct Struct8617DA4 {
+    u8 x;
+    u8 y;
+    u16 tileId;
+};
+
+struct Struct203CF10 {
+    u8 *buffer;
+    u8 curr_buffer_index;
+};
+
+struct DynamicSpriteFrameImage{
+    u8 *data;
+    u16 size;
+};
+
+struct Struct203CF0C {
+    u8 *frameImageTiles;
+    struct DynamicSpriteFrameImage *frameImage;
+    u8 spriteId;
+    u16 *unkC;
+    u16 unk10;
+};
+
+// static functions
+static void sub_81BED50(u8 taskId);
+static void sub_81BEBF4(u8 taskId);
+static void sub_81BF028(u8 taskId);
+static void sub_81BF248(struct Sprite *);
+/*static*/ void sub_81BF2B8(u8* a, u16 b, u8 c, u8 d, u8 e);
+
+// .rodata
+static const u8 gUnknown_08617274[] = {00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00};
+static const u8 gMirageTower_Gfx[] = INCBIN_U8("graphics/misc/mirage_tower.4bpp");
+static const u16 gUnknown_08617B94[] = INCBIN_U16("graphics/misc/mirage_tower.bin");
+static const u16 gRootFossil_Pal[] = INCBIN_U16("graphics/misc/fossil.gbapal");
+static const u8 gRootFossil_Gfx[] = INCBIN_U8("graphics/misc/fossil.4bpp");
+static const u8 gMirageTowerCrumbles_Gfx[] = INCBIN_U8("graphics/misc/mirage_tower_crumbles.4bpp");
+static const u16 gMirageTowerCrumbles_Palette[] = INCBIN_U16("graphics/misc/mirage_tower_crumbles.gbapal");
+
+const s16 gUnknown_08617D64[][3] =
+    {
+        {  0,  10,  65},
+        { 17,   3,  50},
+        {-12,   0,  75},
+        { 10,  15,  90},
+        {  7,   8,  65},
+        {-18,   5,  75},
+        { 22, -10,  55},
+        {-24,  -4,  65},
+    };
+
+const struct SpriteSheet gUnknown_08617D94[] =
+{
+    {gMirageTowerCrumbles_Gfx, 0x0080, 0x0fa0},
+    {NULL}
+};
+
+static const struct Struct8617DA4 gUnknown_08617DA4[] =
+    {
+        {0x12, 0x35, 0x251},
+        {0x13, 0x35, 0x251},
+        {0x14, 0x35, 0x251},
+        {0x12, 0x36, 0x251},
+        {0x13, 0x36, 0x251},
+        {0x14, 0x36, 0x251},
+        {0x12, 0x37, 0x251},
+        {0x13, 0x37, 0x251},
+        {0x14, 0x37, 0x251},
+        {0x12, 0x38, 0x251},
+        {0x13, 0x38, 0x251},
+        {0x14, 0x38, 0x251},
+        {0x12, 0x39, 0x259},
+        {0x13, 0x39, 0x259},
+        {0x14, 0x39, 0x259},
+        {0x12, 0x3A, 0x121},
+        {0x13, 0x3A, 0x121},
+        {0x14, 0x3A, 0x121},
+    };
+
+static const union AnimCmd gSpriteAnim_8617DEC[] =
+{
+    ANIMCMD_FRAME(0, 1),
+    ANIMCMD_END,
+};
+
+static const struct OamData gOamData_8617DF4 =
+{
+    .y = 0,
+    .affineMode = 0,
+    .objMode = 0,
+    .mosaic = 0,
+    .bpp = 0,
+    .shape = 0,
+    .x = 0,
+    .matrixNum = 0,
+    .size = 1,
+    .tileNum = 0,
+    .priority = 0,
+    .paletteNum = 3,
+    .affineParam = 0,
+};
+
+static const union AnimCmd *const gSpriteAnimTable_8617DFC[] =
+{
+    gSpriteAnim_8617DEC,
+};
+
+static const struct SpriteTemplate gUnknown_08617E00 = {
+    0xFFFF, 0xFFFF, &gOamData_8617DF4, gSpriteAnimTable_8617DFC, NULL, gDummySpriteAffineAnimTable, SpriteCallbackDummy
+};
+
+// ewram
+EWRAM_DATA u8* gUnknown_0203CF04 = NULL;
+EWRAM_DATA u8* gUnknown_0203CF08 = NULL;
+EWRAM_DATA struct Struct203CF0C *gUnknown_0203CF0C = NULL;
+EWRAM_DATA struct Struct203CF10 *gUnknown_0203CF10 = NULL;
+EWRAM_DATA u16 *gUnknown_0203CF14 = NULL;
+
+// iwram
+IWRAM_DATA u16 gUnknown_030012A8[8] = {0, 0, 0, 0, 0, 0, 0, 0};
+
+// text
+void sub_81BEB24(void)
+{
+    u8 i;
+    for(i = 0; i < (sizeof(gUnknown_08617DA4)/sizeof(gUnknown_08617DA4[0])); i++)
+        MapGridSetMetatileIdAt(gUnknown_08617DA4[i].x + 7, gUnknown_08617DA4[i].y + 7, gUnknown_08617DA4[i].tileId);
+    DrawWholeMapView();
+}
+
+void sub_81BEB54(void)
+{
+    CreateTask(sub_81BED50, 0x9);
+}
+
+void sub_81BEB68(void)
+{
+    CreateTask(sub_81BEBF4, 0x9);
+}
+
+void sub_81BEB7C(void)
+{
+    CreateTask(sub_81BF028, 0x9);
+}
+
+void sub_81BEB90(void)
+{
+    SetGpuReg(REG_OFFSET_BG0HOFS, gUnknown_0203CF14[0]);
+    SetGpuReg(REG_OFFSET_BG0VOFS, gUnknown_0203CF14[1]);
+}
+
+void sub_81BEBB4(u8 taskId)
+{
+    if(!(gTasks[taskId].data[0]))
+    {
+        gUnknown_0203CF14[0] = -gUnknown_0203CF14[0];
+        gTasks[taskId].data[0] = 2;
+        sub_81BEB90();
+    }
+    else
+        gTasks[taskId].data[0]--;
+}
+
+static void sub_81BEBF4(u8 taskId)
+{
+    u8 zero;
+
+    switch(gTasks[taskId].data[0])
+    {
+    case 0:
+        FreeAllWindowBuffers();
+        SetBgAttribute(0, BG_CTRL_ATTR_MOSAIC, 2);
+        gTasks[taskId].data[0]++;
+        break;
+    case 1:
+        gUnknown_0203CF04 = (u8 *)AllocZeroed(MIRAGE_TOWER_GFX_LENGTH);
+        gUnknown_0203CF08 = (u8 *)AllocZeroed(MIRAGE_TOWER_PALETTE_LENGTH);
+        ChangeBgX(0, 0, 0);
+        ChangeBgY(0, 0, 0);
+        gTasks[taskId].data[0]++;
+        break;
+    case 2:
+        CpuSet(gUnknown_08617274, gUnknown_0203CF04, MIRAGE_TOWER_GFX_LENGTH / 2);
+        LoadBgTiles(0, gUnknown_0203CF04, MIRAGE_TOWER_GFX_LENGTH, 0);
+        gTasks[taskId].data[0]++;
+        break;
+    case 3:
+        SetBgTilemapBuffer(0, gUnknown_0203CF08);
+        CopyToBgTilemapBufferRect_ChangePalette(0, &gUnknown_08617B94, 12, 29, 6, 12, 17);
+        CopyBgTilemapBufferToVram(0);
+        gTasks[taskId].data[0]++;
+        break;
+    case 4:
+        ShowBg(0);
+        gTasks[taskId].data[0]++;
+        break;
+    case 5:
+        sub_81BEB24();
+        gTasks[taskId].data[0]++;
+        break;
+    case 6:
+        gUnknown_0203CF14 = (u16 *)Alloc(4);
+        zero = 0;
+        gUnknown_0203CF14[0] = 2;
+        gUnknown_0203CF14[1] = zero;
+        CreateTask(sub_81BEBB4, 0xA);
+        DestroyTask(taskId);
+        EnableBothScriptContexts();
+        break;
+    }
+}
+
+#ifdef NONMATCHING
+#define OUTER_BUFFER_LENGTH 0x60
+#define INNER_BUFFER_LENGTH 0x30
+static void sub_81BED50(u8 taskId)
+{
+    u8 anotherTaskId, j;
+
+
+    switch(gTasks[taskId].data[0])
+    {
+    case 1:
+        gUnknown_0203CF10 = (struct Struct203CF10 *)AllocZeroed(OUTER_BUFFER_LENGTH * sizeof(struct Struct203CF10));
+        break;
+    case 3:
+        {
+            u16 i;
+            u16 left;
+            u32 index, next;
+
+            index = (u16)gTasks[taskId].data[3];
+            if(gTasks[taskId].data[3] <= (OUTER_BUFFER_LENGTH - 1))
+            {
+                if(gTasks[taskId].data[1] > 1)
+                {
+                    index = (u8)index;
+                    gUnknown_0203CF10[index].buffer = (u8 *)Alloc(INNER_BUFFER_LENGTH);
+                    for(i = 0; i <= (INNER_BUFFER_LENGTH - 1); i++)
+                        gUnknown_0203CF10[index].buffer[i] = i;
+                    for(i = 0; i <= (INNER_BUFFER_LENGTH - 1); i++)
+                    {
+                        u16 rand1, rand2, temp;
+
+                        rand1 = Random() % 0x30;
+                        rand2 = Random() % 0x30;
+                        temp = gUnknown_0203CF10[index].buffer[rand2];
+                        gUnknown_0203CF10[index].buffer[rand2] = gUnknown_0203CF10[index].buffer[rand1];
+                        gUnknown_0203CF10[index].buffer[rand1] = temp;
+                    }
+                    if(gTasks[taskId].data[3] <= (OUTER_BUFFER_LENGTH - 1))
+                        gTasks[taskId].data[3]++;
+                    gTasks[taskId].data[1] = 0;
+                }
+                gTasks[taskId].data[1]++;
+            }
+            index = (u8)gTasks[taskId].data[3];
+            for(left = (u8)gTasks[taskId].data[2]; left < (u16)index; left = next)
+            {
+                j = 0;
+                next = left + 1;
+                while(!j)
+                {
+                    sub_81BF2B8(gUnknown_0203CF04, ((((OUTER_BUFFER_LENGTH - 1) - left) * INNER_BUFFER_LENGTH) + gUnknown_0203CF10[left].buffer[(gUnknown_0203CF10[left].curr_buffer_index)++]), 0, INNER_BUFFER_LENGTH, 1);
+                    j++;
+                }
+                if(gUnknown_0203CF10[left].curr_buffer_index > (INNER_BUFFER_LENGTH - 1))
+                {
+                    FREE_AND_SET_NULL(gUnknown_0203CF10[left].buffer);
+                    gTasks[taskId].data[2]++;
+                    if((left % 2) ==  1)
+                        gUnknown_0203CF14[1]--;
+                }
+            }
+            LoadBgTiles(0, gUnknown_0203CF04, MIRAGE_TOWER_GFX_LENGTH, 0);
+            if(gUnknown_0203CF10[OUTER_BUFFER_LENGTH - 1].curr_buffer_index > (INNER_BUFFER_LENGTH - 1))
+                break;
+            return;
+        }
+    case 4:
+        UnsetBgTilemapBuffer(0);
+        anotherTaskId = FindTaskIdByFunc(sub_81BEBB4);
+        if(anotherTaskId != 0xFF)
+            DestroyTask(anotherTaskId);
+        gUnknown_0203CF14[1] = gUnknown_0203CF14[0] = 0;
+        sub_81BEB90();
+        break;
+    case 5:
+        FREE_AND_SET_NULL(gUnknown_0203CF14);
+        FREE_AND_SET_NULL(gUnknown_0203CF10);
+        FREE_AND_SET_NULL(gUnknown_0203CF04);
+        FREE_AND_SET_NULL(gUnknown_0203CF08);
+        break;
+    case 6:
+        SetGpuRegBits(REG_OFFSET_BG2CNT, 0x2);
+        SetGpuRegBits(REG_OFFSET_BG0CNT, 0x0);
+        SetBgAttribute(0, BG_CTRL_ATTR_MOSAIC, 0);
+        sub_81971D0();
+        break;
+    case 7:
+        ShowBg(0);
+        break;
+    case 8:
+        DestroyTask(taskId);
+        EnableBothScriptContexts();
+        break;
+    }
+    gTasks[taskId].data[0]++;
+}
+
+#else
+ASM_DIRECT
+static void sub_81BED50(u8 taskId)
+{
+    asm("\n\
+        .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, 0x10\n\
+        lsls r0, 24\n\
+        lsrs r0, 24\n\
+        mov r10, r0\n\
+        ldr r1, =gTasks\n\
+        lsls r0, 2\n\
+        add r0, r10\n\
+        lsls r0, 3\n\
+        adds r0, r1\n\
+        ldrh r0, [r0, 0x8]\n\
+        subs r0, 0x1\n\
+        lsls r0, 16\n\
+        asrs r0, 16\n\
+        adds r6, r1, 0\n\
+        cmp r0, 0x7\n\
+        bls _081BED7C\n\
+        b _081BF002\n\
+    _081BED7C:\n\
+        lsls r0, 2\n\
+        ldr r1, =_081BED90\n\
+        adds r0, r1\n\
+        ldr r0, [r0]\n\
+        mov pc, r0\n\
+        .pool\n\
+        .align 2, 0\n\
+    _081BED90:\n\
+        .4byte _081BEDB0\n\
+        .4byte _081BF002\n\
+        .4byte _081BEDC4\n\
+        .4byte _081BEF64\n\
+        .4byte _081BEF94\n\
+        .4byte _081BEFD0\n\
+        .4byte _081BEFF0\n\
+        .4byte _081BEFF8\n\
+    _081BEDB0:\n\
+        ldr r4, =gUnknown_0203CF10\n\
+        movs r0, 0xC0\n\
+        lsls r0, 2\n\
+        bl AllocZeroed\n\
+        str r0, [r4]\n\
+        b _081BF002\n\
+        .pool\n\
+    _081BEDC4:\n\
+        mov r1, r10\n\
+        lsls r0, r1, 2\n\
+        adds r1, r0, r1\n\
+        lsls r1, 3\n\
+        adds r2, r1, r6\n\
+        ldrh r3, [r2, 0xE]\n\
+        movs r4, 0xE\n\
+        ldrsh r1, [r2, r4]\n\
+        str r0, [sp, 0x8]\n\
+        cmp r1, 0x5F\n\
+        bgt _081BEE8A\n\
+        movs r1, 0xA\n\
+        ldrsh r0, [r2, r1]\n\
+        cmp r0, 0x1\n\
+        ble _081BEE7C\n\
+        lsls r0, r3, 24\n\
+        lsrs r4, r0, 24\n\
+        movs r0, 0x30\n\
+        bl Alloc\n\
+        ldr r3, =gUnknown_0203CF10\n\
+        ldr r1, [r3]\n\
+        lsls r2, r4, 3\n\
+        adds r1, r2, r1\n\
+        str r0, [r1]\n\
+        movs r5, 0\n\
+        adds r4, r2, 0\n\
+    _081BEDFA:\n\
+        ldr r0, [r3]\n\
+        adds r0, r4, r0\n\
+        ldr r0, [r0]\n\
+        adds r0, r5\n\
+        strb r5, [r0]\n\
+        adds r0, r5, 0x1\n\
+        lsls r0, 16\n\
+        lsrs r5, r0, 16\n\
+        cmp r5, 0x2F\n\
+        bls _081BEDFA\n\
+        movs r5, 0\n\
+        ldr r7, =gUnknown_0203CF10\n\
+        adds r6, r2, 0\n\
+    _081BEE14:\n\
+        bl Random\n\
+        lsls r0, 16\n\
+        lsrs r0, 16\n\
+        movs r1, 0x30\n\
+        bl __umodsi3\n\
+        adds r4, r0, 0\n\
+        lsls r4, 16\n\
+        lsrs r4, 16\n\
+        bl Random\n\
+        lsls r0, 16\n\
+        lsrs r0, 16\n\
+        movs r1, 0x30\n\
+        bl __umodsi3\n\
+        lsls r0, 16\n\
+        lsrs r0, 16\n\
+        ldr r1, [r7]\n\
+        adds r1, r6, r1\n\
+        ldr r1, [r1]\n\
+        adds r0, r1, r0\n\
+        ldrb r2, [r0]\n\
+        adds r1, r4 \n\
+        ldrb r1, [r1]\n\
+        strb r1, [r0]\n\
+        ldr r0, [r7]\n\
+        adds r0, r6, r0\n\
+        ldr r0, [r0]\n\
+        adds r0, r4\n\
+        strb r2, [r0]\n\
+        adds r0, r5, 0x1\n\
+        lsls r0, 16\n\
+        lsrs r5, r0, 16\n\
+        cmp r5, 0x2F\n\
+        bls _081BEE14\n\
+        ldr r0, =gTasks\n\
+        ldr r1, [sp, 0x8]\n\
+        add r1, r10\n\
+        lsls r1, 3\n\
+        adds r2, r1, r0\n\
+        ldrh r3, [r2, 0xE]\n\
+        movs r4, 0xE\n\
+        ldrsh r1, [r2, r4]\n\
+        adds r6, r0, 0\n\
+        cmp r1, 0x5F\n\
+        bgt _081BEE78\n\
+        adds r0, r3, 0x1\n\
+        strh r0, [r2, 0xE]\n\
+    _081BEE78:\n\
+        movs r0, 0\n\
+        strh r0, [r2, 0xA]\n\
+    _081BEE7C:\n\
+        ldr r1, [sp, 0x8]\n\
+        add r1, r10\n\
+        lsls r1, 3\n\
+        adds r1, r6\n\
+        ldrh r0, [r1, 0xA]\n\
+        adds r0, 0x1\n\
+        strh r0, [r1, 0xA]\n\
+    _081BEE8A:\n\
+        ldr r0, [sp, 0x8]\n\
+        add r0, r10\n\
+        lsls r0, 3\n\
+        adds r0, r6\n\
+        ldrb r4, [r0, 0xE]\n\
+        ldrb r5, [r0, 0xC]\n\
+        lsls r0, r4, 16\n\
+        cmp r5, r4\n\
+        bcs _081BEF32\n\
+        str r0, [sp, 0xC]\n\
+    _081BEE9E:\n\
+        movs r6, 0\n\
+        adds r0, r5, 0x1\n\
+        str r0, [sp, 0x4]\n\
+        lsls r4, r5, 3\n\
+        movs r2, 0x5F\n\
+        subs r1, r2, r5\n\
+        lsls r0, r1, 1\n\
+        adds r0, r1\n\
+        lsls r0, 4\n\
+        mov r9, r0\n\
+    _081BEEB2:\n\
+        ldr r0, =gUnknown_0203CF04\n\
+        ldr r0, [r0]\n\
+        ldr r7, =gUnknown_0203CF10\n\
+        ldr r3, [r7]\n\
+        adds r3, r4, r3\n\
+        ldrb r2, [r3, 0x4]\n\
+        adds r1, r2, 0x1\n\
+        strb r1, [r3, 0x4]\n\
+        lsls r2, 24\n\
+        lsrs r2, 24\n\
+        ldr r1, [r3]\n\
+        adds r1, r2\n\
+        ldrb r1, [r1]\n\
+        add r1, r9\n\
+        lsls r1, 16\n\
+        lsrs r1, 16\n\
+        movs r2, 0x1\n\
+        mov r8, r2\n\
+        str r2, [sp]\n\
+        movs r2, 0\n\
+        movs r3, 0x30\n\
+        bl sub_81BF2B8\n\
+        adds r0, r6, 0x1\n\
+        lsls r0, 24\n\
+        lsrs r6, r0, 24\n\
+        cmp r6, 0\n\
+        beq _081BEEB2\n\
+        ldr r0, [r7]\n\
+        adds r1, r4, r0\n\
+        ldrb r0, [r1, 0x4]\n\
+        cmp r0, 0x2F\n\
+        bls _081BEF24\n\
+        ldr r0, [r1]\n\
+        bl Free\n\
+        ldr r0, [r7]\n\
+        adds r0, r4, r0\n\
+        movs r1, 0\n\
+        str r1, [r0]\n\
+        ldr r1, [sp, 0x8]\n\
+        add r1, r10\n\
+        lsls r1, 3\n\
+        ldr r4, =gTasks\n\
+        adds r1, r4\n\
+        ldrh r0, [r1, 0xC]\n\
+        adds r0, 0x1\n\
+        strh r0, [r1, 0xC]\n\
+        mov r0, r8\n\
+        ands r5, r0\n\
+        cmp r5, 0x1\n\
+        bne _081BEF24\n\
+        ldr r0, =gUnknown_0203CF14\n\
+        ldr r1, [r0]\n\
+        ldrh r0, [r1, 0x2]\n\
+        subs r0, 0x1\n\
+        strh r0, [r1, 0x2]\n\
+    _081BEF24:\n\
+        ldr r1, [sp, 0x4]\n\
+        lsls r0, r1, 16\n\
+        lsrs r5, r0, 16\n\
+        ldr r2, [sp, 0xC]\n\
+        lsrs r0, r2, 16\n\
+        cmp r5, r0\n\
+        bcc _081BEE9E\n\
+    _081BEF32:\n\
+        ldr r0, =gUnknown_0203CF04\n\
+        ldr r1, [r0]\n\
+        movs r2, 0x92\n\
+        lsls r2, 4\n\
+        movs r0, 0\n\
+        movs r3, 0\n\
+        bl LoadBgTiles\n\
+        ldr r0, =gUnknown_0203CF10\n\
+        ldr r0, [r0]\n\
+        movs r4, 0xBE\n\
+        lsls r4, 2\n\
+        adds r0, r4\n\
+        ldrb r0, [r0, 0x4]\n\
+        cmp r0, 0x2F\n\
+        bhi _081BF002\n\
+        b _081BF014\n\
+        .pool\n\
+    _081BEF64:\n\
+        movs r0, 0\n\
+        bl UnsetBgTilemapBuffer\n\
+        ldr r0, =sub_81BEBB4\n\
+        bl FindTaskIdByFunc\n\
+        lsls r0, 24\n\
+        lsrs r0, 24\n\
+        cmp r0, 0xFF\n\
+        beq _081BEF7C\n\
+        bl DestroyTask\n\
+    _081BEF7C:\n\
+        ldr r0, =gUnknown_0203CF14\n\
+        ldr r1, [r0]\n\
+        movs r0, 0\n\
+        strh r0, [r1]\n\
+        strh r0, [r1, 0x2]\n\
+        bl sub_81BEB90\n\
+        b _081BF002\n\
+        .pool\n\
+    _081BEF94:\n\
+        ldr r4, =gUnknown_0203CF14\n\
+        ldr r0, [r4]\n\
+        bl Free\n\
+        movs r5, 0\n\
+        str r5, [r4]\n\
+        ldr r4, =gUnknown_0203CF10\n\
+        ldr r0, [r4]\n\
+        bl Free\n\
+        str r5, [r4]\n\
+        ldr r4, =gUnknown_0203CF04\n\
+        ldr r0, [r4]\n\
+        bl Free\n\
+        str r5, [r4]\n\
+        ldr r4, =gUnknown_0203CF08\n\
+        ldr r0, [r4]\n\
+        bl Free\n\
+        str r5, [r4]\n\
+        b _081BF002\n\
+        .pool\n\
+    _081BEFD0:\n\
+        movs r0, 0xC\n\
+        movs r1, 0x2\n\
+        bl SetGpuRegBits\n\
+        movs r0, 0x8\n\
+        movs r1, 0\n\
+        bl SetGpuRegBits\n\
+        movs r0, 0\n\
+        movs r1, 0x7\n\
+        movs r2, 0\n\
+        bl SetBgAttribute\n\
+        bl sub_81971D0\n\
+        b _081BF002\n\
+    _081BEFF0:\n\
+        movs r0, 0\n\
+        bl ShowBg\n\
+        b _081BF002\n\
+    _081BEFF8:\n\
+        mov r0, r10\n\
+        bl DestroyTask\n\
+        bl EnableBothScriptContexts\n\
+    _081BF002:\n\
+        ldr r0, =gTasks\n\
+        mov r2, r10\n\
+        lsls r1, r2, 2\n\
+        add r1, r10\n\
+        lsls r1, 3\n\
+        adds r1, r0\n\
+        ldrh r0, [r1, 0x8]\n\
+        adds r0, 0x1\n\
+        strh r0, [r1, 0x8]\n\
+    _081BF014:\n\
+        add sp, 0x10\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\
+        .pool\n\
+        .syntax divided");
+}
+#endif // NONMATCHING
+
+static void sub_81BF028(u8 taskId)
+{
+    u16 i;
+
+    switch(gTasks[taskId].data[0])
+    {
+    case 1:
+        gUnknown_0203CF0C = (struct Struct203CF0C *)AllocZeroed(sizeof(struct Struct203CF0C));
+        gUnknown_0203CF0C->frameImageTiles = (u8 *)AllocZeroed(ROOT_FOSSIL_GFX_LENGTH);
+        gUnknown_0203CF0C->frameImage = (struct DynamicSpriteFrameImage *) AllocZeroed(sizeof(struct DynamicSpriteFrameImage));
+        gUnknown_0203CF0C->unkC = (u16 *)AllocZeroed(ROOT_FOSSIL_GFX_RANDOMIZER_LENGTH * sizeof(u16));
+        gUnknown_0203CF0C->unk10 = 0;
+        break;
+    case 2:
+        {
+            u8 *buffer;
+            buffer = gUnknown_0203CF0C->frameImageTiles;
+            for(i = 0; i < ROOT_FOSSIL_GFX_LENGTH; i++, buffer++)
+                *buffer = gRootFossil_Gfx[i];
+        }
+        break;
+    case 3:
+        gUnknown_0203CF0C->frameImage->data = gUnknown_0203CF0C->frameImageTiles;
+        gUnknown_0203CF0C->frameImage->size = ROOT_FOSSIL_GFX_LENGTH;
+        break;
+    case 4:
+        {
+            u8 spriteId, zero;
+            struct SpriteTemplate fossilTemplate;
+
+            fossilTemplate = gUnknown_08617E00;
+            fossilTemplate.images = (struct SpriteFrameImage *)(gUnknown_0203CF0C->frameImage);
+            spriteId = CreateSprite(&fossilTemplate, 128, -16, 1);
+            gUnknown_0203CF0C->spriteId = spriteId;
+            zero = 0;
+            gSprites[gUnknown_0203CF0C->spriteId].centerToCornerVecX = zero;
+            gSprites[gUnknown_0203CF0C->spriteId].data[0] = gSprites[gUnknown_0203CF0C->spriteId].pos1.x;
+            gSprites[gUnknown_0203CF0C->spriteId].data[1] = 1;
+        }
+    case 5:
+        for(i = 0; i < ROOT_FOSSIL_GFX_RANDOMIZER_LENGTH; i++)
+            gUnknown_0203CF0C->unkC[i] = i;
+        break;
+    case 6:
+        {
+            u16 rand1, rand2, temp, j;
+            j = (ROOT_FOSSIL_GFX_RANDOMIZER_LENGTH * sizeof(u16)) - 1;
+            for(i = 0; i <= j; i++)
+            {
+                rand1 = Random() % 0x100;
+                rand2 = Random() % 0x100;
+                j = (ROOT_FOSSIL_GFX_RANDOMIZER_LENGTH * sizeof(u16)) - 1;
+                temp = gUnknown_0203CF0C->unkC[rand2];
+                gUnknown_0203CF0C->unkC[rand2] = gUnknown_0203CF0C->unkC[rand1];
+                gUnknown_0203CF0C->unkC[rand1] = temp;
+            }
+            gSprites[gUnknown_0203CF0C->spriteId].callback = sub_81BF248;
+            break;
+        }
+    case 7:
+        if(gSprites[gUnknown_0203CF0C->spriteId].callback != SpriteCallbackDummy)
+            return;
+        DestroySprite(&gSprites[gUnknown_0203CF0C->spriteId]);
+        FREE_AND_SET_NULL(gUnknown_0203CF0C->unkC);;
+        FREE_AND_SET_NULL(gUnknown_0203CF0C->frameImage);
+        FREE_AND_SET_NULL(gUnknown_0203CF0C->frameImageTiles);
+        FREE_AND_SET_NULL(gUnknown_0203CF0C);
+        break;
+    case 8:
+        EnableBothScriptContexts();
+    }
+    ++gTasks[taskId].data[0];
+}
+
+static void sub_81BF248(struct Sprite *sprite)
+{
+    if (gUnknown_0203CF0C->unk10 >= (ROOT_FOSSIL_GFX_RANDOMIZER_LENGTH))
+    {
+        sprite->callback = SpriteCallbackDummy;
+    }
+    else if (sprite->pos1.y >= 0x60)
+    {
+        u8 i;
+        for (i = 0; i < 2; i++)
+        {
+            sub_81BF2B8(gUnknown_0203CF0C->frameImageTiles, gUnknown_0203CF0C->unkC[gUnknown_0203CF0C->unk10++], 0, 16, 0);
+        }
+        StartSpriteAnim(sprite, 0);
+    }
+    else
+    {
+        sprite->pos1.y++;
+    }
+}