Decompile more intro functions (#108)

* start decompiling intro task

* ignore Thumbs.db

* decompile more code

* actually ignore Thumbs.db

* decompile more functions

* fix sapphire

* sort of fix task_intro_7

* name some functions and variables

* more cleanup

3 files changed, 587 insertions, 33 deletions

diff --git a/src/decompress.c b/src/decompress.c
index adc6798b6..b38acc7b2 100644
--- a/src/decompress.c
+++ b/src/decompress.c
@@ -10,7 +10,7 @@ extern void *gUnknown_081FAF4C[];
 
 extern void DrawSpindaSpots(u16, u32, void *, u8);
 
-void sub_800D378(struct SpriteSheet *a, u32 b, u32 c, u32 d, void *e, s32 f, u32 g, u32 h);
+void sub_800D378(const struct SpriteSheet *a, u32 b, u32 c, u32 d, void *e, s32 f, u32 g, u32 h);
 
 void sub_800D238(const void *src, void *dest)
 {
@@ -22,7 +22,7 @@ void LZDecompressVram(const void *src, void *dest)
     LZ77UnCompVram(src, dest);
 }
 
-void LoadCompressedObjectPic(struct SpriteSheet *a)
+void LoadCompressedObjectPic(const struct SpriteSheet *a)
 {
     struct SpriteSheet spriteSheet;
     
@@ -33,7 +33,7 @@ void LoadCompressedObjectPic(struct SpriteSheet *a)
     LoadSpriteSheet(&spriteSheet);
 }
 
-void LoadCompressedObjectPicOverrideBuffer(struct SpriteSheet *a, void *buffer)
+void LoadCompressedObjectPicOverrideBuffer(const struct SpriteSheet *a, void *buffer)
 {
     struct SpriteSheet spriteSheet;
     
@@ -44,7 +44,7 @@ void LoadCompressedObjectPicOverrideBuffer(struct SpriteSheet *a, void *buffer)
     LoadSpriteSheet(&spriteSheet);
 }
 
-void LoadCompressedObjectPalette(struct SpritePalette *a)
+void LoadCompressedObjectPalette(const struct SpritePalette *a)
 {
     struct SpritePalette spritePalette;
     
@@ -54,7 +54,7 @@ void LoadCompressedObjectPalette(struct SpritePalette *a)
     LoadSpritePalette(&spritePalette);
 }
 
-void LoadCompressedObjectPaletteOverrideBuffer(struct SpritePalette *a, void *buffer)
+void LoadCompressedObjectPaletteOverrideBuffer(const struct SpritePalette *a, void *buffer)
 {
     struct SpritePalette spritePalette;
     
@@ -72,7 +72,7 @@ void DecompressPicFromTable_2(const struct SpriteSheet *a, u8 b, u8 c, void *d,
         LZ77UnCompWram(a->data, e);
 }
 
-void sub_800D334(struct SpriteSheet *a, u32 b, u32 c, u32 d, void *dest, s32 f, u32 g)
+void sub_800D334(const struct SpriteSheet *a, u32 b, u32 c, u32 d, void *dest, s32 f, u32 g)
 {
     u32 unk;
     
@@ -83,7 +83,7 @@ void sub_800D334(struct SpriteSheet *a, u32 b, u32 c, u32 d, void *dest, s32 f,
     sub_800D378(a, b, c, d, dest, f, g, unk);
 }
 
-void sub_800D378(struct SpriteSheet *a, u32 b, u32 c, u32 d, void *dest, s32 f, u32 g, u32 h)
+void sub_800D378(const struct SpriteSheet *a, u32 b, u32 c, u32 d, void *dest, s32 f, u32 g, u32 h)
 {
     u8 r7 = h;
     
diff --git a/src/intro.c b/src/intro.c
index e103109f9..ac51e456c 100644
--- a/src/intro.c
+++ b/src/intro.c
@@ -1,8 +1,14 @@
 #include "global.h"
+#include "link.h"
 #include "main.h"
 #include "palette.h"
+#include "rng.h"
+#include "songs.h"
+#include "sound.h"
+#include "species.h"
+#include "sprite.h"
 #include "task.h"
-#include "link.h"
+#include "trig.h"
 
 struct GcmbStruct
 {
@@ -10,57 +16,131 @@ struct GcmbStruct
     u8 gcmb_field_2;
 };
 
-extern s32 gUnknown_03005ED0;
+extern u16 gUnknown_02039318;
+extern u16 gUnknown_0203931A;
+extern u16 gUnknown_02039358;
+extern u16 gUnknown_0203935A;
+
+extern u32 gIntroFrameCounter;
 extern struct GcmbStruct gUnknown_03005EE0;
 extern u16 gSaveFileStatus;
+extern u8 gReservedSpritePaletteCount;
+
+extern const u16 gUnknown_08406974[];
+extern const u8 gUnknown_08406B74[];
+extern const u8 gUnknown_08406F28[];
+extern const u8 gUnknown_0840725C[];
+extern const u8 gUnknown_0840754C[];
+extern const u8 gUnknown_08407764[];
+extern const u8 gUnknown_084098D4[];
+extern const u8 gUnknown_08409AD4[];
+extern const u8 gUnknown_08409C04[];
+extern const u16 gUnknown_0840A758[];
+extern const u8 gUnknown_0840A778[];
+extern const u8 gUnknown_0840A7E4[];
+extern union AnimCmd *gUnknown_0840AE80[];
+extern const struct SpriteTemplate gSpriteTemplate_840AFF0;
+extern const struct SpriteSheet gUnknown_0840B008;
+extern const struct SpriteSheet gUnknown_0840B018;
+extern const struct SpritePalette gUnknown_0840B028[];
+extern const struct SpriteTemplate gSpriteTemplate_840B1F4;
+extern const struct SpriteSheet gUnknown_0840B20C;
+extern const struct SpriteSheet gUnknown_0840B21C;
+extern const struct SpritePalette gUnknown_0840B22C;
+extern const struct SpritePalette gUnknown_0840B23C[];
+extern const struct SpriteSheet gIntro2BrendanSpriteSheet;
+extern const struct SpriteSheet gIntro2MaySpriteSheet;
+extern const struct SpriteSheet gIntro2BicycleSpriteSheet;
+extern const struct SpriteSheet gIntro2LatiosSpriteSheet;
+extern const struct SpriteSheet gIntro2LatiasSpriteSheet;
+extern const struct SpritePalette gIntro2SpritePalettes[];
 
 extern const u8 gIntroCopyright_Gfx[];
 extern const u16 gIntroCopyright_Pal[];
 extern const u16 gIntroCopyright_Tilemap[];
 
+extern void LoadCompressedObjectPic(const struct SpriteSheet *);
+extern void LoadCompressedObjectPalette(const struct SpritePalette *);
 extern void CB2_InitTitleScreen(void);
+extern u8 sub_8148EC0(/*TODO: arg types*/);
+extern u8 intro_create_brendan_sprite(/*TODO: arg types*/);
+extern u8 intro_create_may_sprite(/*TODO: arg types*/);
 
-void CB2_813B7EC(void);
-void task_intro_1(u8);
+static void MainCB2_EndIntro(void);
+static void Task_IntroLoadPart1Graphics(u8);
+static void Task_IntroFadeIn(u8);
+static void Task_IntroWaterDrops(u8);
+static void task_intro_4(u8);
+static void task_intro_5(u8);
+static void Task_IntroLoadPart2Graphics(u8);
+static void Task_IntroStartBikeRide(u8);
+static void task_intro_8(u8);
+static void task_intro_9(u8);
+static void task_intro_10(u8);
+static void task_intro_11(u8);
+static void task_intro_12(u8);
+static void task_intro_13(u8);
+static void task_intro_14(u8);
+static void task_intro_15(u8);
+static void task_intro_16(u8);
+static void task_intro_17(u8);
+static void Task_IntroPokemonBattle(u8);
+static void task_intro_19(u8);
+void sub_813CAF4(u8);
+void intro_reset_and_hide_bgs(void);
+void sub_813CCE8(u8);
+void sub_813CE30(u16, u16, u16, u16);
+u8 sub_813CE88(/*TODO: arg types*/);
+u8 sub_813CFA8(/*TODO: arg types*/);
+u8 sub_813D584(/*TODO: arg types*/);
+void sub_813D788(struct Sprite *);
+void sub_813D880(struct Sprite *);
+sub_813D954(/*TODO: arg types*/);
+void sub_813DB9C(struct Sprite *);
+void sub_813DE70(struct Sprite *);
+void sub_813E10C(struct Sprite *);
+void sub_813E210(struct Sprite *);
+void sub_813E7C0(u8);
+void sub_813EB4C(u8);
 
-void sub_813B784(void)
+static void VBlankCB_Intro(void)
 {
     LoadOam();
     ProcessSpriteCopyRequests();
     TransferPlttBuffer();
 }
 
-void CB2_813B798(void)
+static void MainCB2_Intro(void)
 {
     RunTasks();
     AnimateSprites();
     BuildOamBuffer();
     UpdatePaletteFade();
     if (gMain.newKeys && !gPaletteFade.active)
-        SetMainCallback2(CB2_813B7EC);
-    else if (gUnknown_03005ED0 != -1)
-        gUnknown_03005ED0++;
+        SetMainCallback2(MainCB2_EndIntro);
+    else if (gIntroFrameCounter != -1)
+        gIntroFrameCounter++;
 }
 
-void CB2_813B7EC(void)
+static void MainCB2_EndIntro(void)
 {
     if (!UpdatePaletteFade())
         SetMainCallback2(CB2_InitTitleScreen);
 }
 
-void sub_813B808(u16 a1, u16 a2, u16 a3)
+static void LoadCopyrightGraphics(u16 a1, u16 a2, u16 a3)
 {
     LZ77UnCompVram(gIntroCopyright_Gfx, (void *)(VRAM + a1));
     LoadPalette(gIntroCopyright_Pal, a3, 0x20);
     CpuCopy16(gIntroCopyright_Tilemap, (void *)(VRAM + a2), 0x500);
 }
 
-void SerialCb_CopyrightScreen(void)
+static void SerialCb_CopyrightScreen(void)
 {
     GameCubeMultiBoot_HandleSerialInterrupt(&gUnknown_03005EE0);
 }
 
-u8 SetUpCopyrightScreen(void)
+static u8 SetUpCopyrightScreen(void)
 {
     u16 ime;
 
@@ -79,7 +159,7 @@ u8 SetUpCopyrightScreen(void)
         DmaFill32(3, 0, (void *)OAM, OAM_SIZE);
         DmaFill16(3, 0, (void *)(PLTT + 2), PLTT_SIZE - 2);
         ResetPaletteFade();
-        sub_813B808(0, 14336, 0);
+        LoadCopyrightGraphics(0, 14336, 0);
         remove_some_task();
         ResetTasks();
         ResetSpriteData();
@@ -90,9 +170,9 @@ u8 SetUpCopyrightScreen(void)
         REG_IME = 0;
         REG_IE |= INTR_FLAG_VBLANK;
         REG_IME = ime;
-        REG_DISPSTAT |= 8;
-        SetVBlankCallback(sub_813B784);
-        REG_DISPCNT = 320;
+        REG_DISPSTAT |= DISPSTAT_VBLANK_INTR;
+        SetVBlankCallback(VBlankCB_Intro);
+        REG_DISPCNT = DISPCNT_MODE_0 | DISPCNT_OBJ_1D_MAP | DISPCNT_BG0_ON;
         SetSerialCallback(SerialCb_CopyrightScreen);
         GameCubeMultiBoot_Init(&gUnknown_03005EE0);
     default:
@@ -111,8 +191,8 @@ u8 SetUpCopyrightScreen(void)
     case 141:
         if (UpdatePaletteFade())
             break;
-        CreateTask(task_intro_1, 0);
-        SetMainCallback2(CB2_813B798);
+        CreateTask(Task_IntroLoadPart1Graphics, 0);
+        SetMainCallback2(MainCB2_Intro);
         if (gUnknown_03005EE0.gcmb_field_2)
         {
             GameCubeMultiBoot_ExecuteProgram(&gUnknown_03005EE0);
@@ -145,3 +225,477 @@ void CB2_InitCopyrightScreen(void)
 {
     SetUpCopyrightScreen();
 }
+
+static void Task_IntroLoadPart1Graphics(u8 taskId)
+{
+    SetVBlankCallback(NULL);
+    gUnknown_02039318 = Random() & 1;
+    intro_reset_and_hide_bgs();
+    REG_BG3VOFS = 0;
+    REG_BG2VOFS = 0x50;
+    REG_BG1VOFS = 0x18;
+    REG_BG0VOFS = 0x28;
+    LZ77UnCompVram(gUnknown_08407764, (void *)VRAM);
+    LZ77UnCompVram(gUnknown_08406B74, (void *)(VRAM + 0x8000));
+    DmaClear16(3, VRAM + 0x8800, 0x800);
+    LZ77UnCompVram(gUnknown_08406F28, (void *)(VRAM + 0x9000));
+    DmaClear16(3, VRAM + 0x9800, 0x800);
+    LZ77UnCompVram(gUnknown_0840725C, (void *)(VRAM + 0xA000));
+    DmaClear16(3, VRAM + 0xA800, 0x800);
+    LZ77UnCompVram(gUnknown_0840754C, (void *)(VRAM + 0xB000));
+    DmaClear16(3, VRAM + 0xB800, 0x800);
+    LoadPalette(gUnknown_08406974, 0, 0x200);
+    REG_BG3CNT = 0x9603;
+    REG_BG2CNT = 0x9402;
+    REG_BG1CNT = 0x9201;
+    REG_BG0CNT = 0x9000;
+    LoadCompressedObjectPic(&gUnknown_0840B008);
+    LoadCompressedObjectPic(&gUnknown_0840B018);
+    LoadSpritePalettes(gUnknown_0840B028);
+    CpuCopy16(gPlttBufferUnfaded + 0x100, gPlttBufferUnfaded + 0x1F0, 0x20);
+    CpuCopy16(gPlttBufferUnfaded + 0x100, gPlttBufferUnfaded + 0x1E1, 0x1E);
+    CpuCopy16(gPlttBufferUnfaded + 0x100, gPlttBufferUnfaded + 0x1D2, 0x1C);
+    CpuCopy16(gPlttBufferUnfaded + 0x100, gPlttBufferUnfaded + 0x1C3, 0x1A);
+    CpuCopy16(gPlttBufferUnfaded + 0x100, gPlttBufferUnfaded + 0x1B4, 0x18);
+    CpuCopy16(gPlttBufferUnfaded + 0x100, gPlttBufferUnfaded + 0x1A5, 0x16);
+    CpuCopy16(gPlttBufferUnfaded + 0x100, gPlttBufferUnfaded + 0x196, 0x14);
+    gTasks[taskId].data[0] = sub_813D584(0xEC, -14, 0x200, 1, 0x78, 0);
+    gTasks[taskId].func = Task_IntroFadeIn;
+}
+
+static void Task_IntroFadeIn(u8 taskId)
+{
+    BeginNormalPaletteFade(0xFFFFFFFF, 0, 0x10, 0, 0);
+    SetVBlankCallback(VBlankCB_Intro);
+    REG_DISPCNT = DISPCNT_MODE_0 | DISPCNT_OBJ_1D_MAP | DISPCNT_BG_ALL_ON | DISPCNT_OBJ_ON;
+    gTasks[taskId].func = Task_IntroWaterDrops;
+    gIntroFrameCounter = 0;
+    m4aSongNumStart(0x19E);
+    ResetSerial();
+}
+
+static void Task_IntroWaterDrops(u8 taskId)
+{
+    //start moving rock
+    if (gIntroFrameCounter == 76)
+        gSprites[gTasks[taskId].data[0]].data0 = 1;
+    
+    //drop rock
+    if (gIntroFrameCounter == 251)
+        gSprites[gTasks[taskId].data[0]].data0 = 2;
+        
+    //drop two more rocks
+    if (gIntroFrameCounter == 368)
+        sub_813D584(0x30, 0, 0x400, 5, 0x70, 1);
+    if (gIntroFrameCounter == 384)
+        sub_813D584(0xC8, 0x3C, 0x400, 9, 0x80, 1);
+    
+    //show GameFreak logo
+    if (gIntroFrameCounter == 560)
+        sub_813D954(0x78, 0x50, CreateTask(sub_813CCE8, 0));
+    
+    if (gIntroFrameCounter > 739)
+    {
+        gTasks[taskId].data[1] = 0x50;
+        gTasks[taskId].data[2] = 0;
+        gTasks[taskId].data[3] = 0x18;
+        gTasks[taskId].data[4] = 0;
+        gTasks[taskId].data[5] = 0x28;
+        gTasks[taskId].data[6] = 0;
+        gTasks[taskId].func = task_intro_4;
+    }
+}
+
+static void task_intro_4(u8 taskId)
+{
+    if (gIntroFrameCounter < 904)
+    {
+        s32 r2;
+        
+        //slide backgrounds downward
+        r2 = (gTasks[taskId].data[1] << 16) + (u16)gTasks[taskId].data[2] - 0xC000;
+        gTasks[taskId].data[1] = r2 >> 16;
+        gTasks[taskId].data[2] = r2;
+        REG_BG2VOFS = gTasks[taskId].data[1];
+        r2 = (gTasks[taskId].data[3] << 16) + (u16)gTasks[taskId].data[4] - 0x10000;
+        gTasks[taskId].data[3] = r2 >> 16;
+        gTasks[taskId].data[4] = r2;
+        REG_BG1VOFS = gTasks[taskId].data[3];
+        r2 = (gTasks[taskId].data[5] << 16) + (u16)gTasks[taskId].data[6] - 0x18000;
+        gTasks[taskId].data[5] = r2 >> 16;
+        gTasks[taskId].data[6] = r2;
+        REG_BG0VOFS = gTasks[taskId].data[5];
+        
+        //show Lati@s sprite
+        if (gIntroFrameCounter == 880)
+        {
+            u8 spriteId = CreateSprite(&gSpriteTemplate_840AFF0, 0xC8, 0xA0, 10);
+            
+            gSprites[spriteId].invisible = 1;
+        }
+    }
+    else
+    {
+        //fade to white
+        if (gIntroFrameCounter > 1007)
+        {
+            BeginNormalPaletteFade(0xFFFFFFFF, 0, 0, 0x10, 0xFFFF);
+            gTasks[taskId].func = task_intro_5;
+        }
+    }
+}
+
+static void task_intro_5(u8 taskId)
+{
+    if (gIntroFrameCounter > 1026)
+        gTasks[taskId].func = Task_IntroLoadPart2Graphics;
+}
+
+static void Task_IntroLoadPart2Graphics(u8 taskId)
+{
+    intro_reset_and_hide_bgs();
+    SetVBlankCallback(NULL);
+    ResetSpriteData();
+    FreeAllSpritePalettes();
+    gUnknown_02039358 = 0;
+    gUnknown_0203935A = 0;
+#ifdef SAPPHIRE
+    load_intro_part2_graphics(0);
+#else
+    load_intro_part2_graphics(1);
+#endif
+    gTasks[taskId].func = Task_IntroStartBikeRide;
+}
+
+static void Task_IntroStartBikeRide(u8 taskId)
+{
+    u8 spriteId;
+    
+    if (gUnknown_02039318 == 0)
+        LoadCompressedObjectPic(&gIntro2BrendanSpriteSheet);
+    else
+        LoadCompressedObjectPic(&gIntro2MaySpriteSheet);
+    LoadCompressedObjectPic(&gIntro2BicycleSpriteSheet);
+#ifdef SAPPHIRE
+    LoadCompressedObjectPic(&gIntro2LatiasSpriteSheet);
+#else
+    LoadCompressedObjectPic(&gIntro2LatiosSpriteSheet);
+#endif
+    LoadSpritePalettes(gIntro2SpritePalettes);
+    if (gUnknown_02039318 == 0)
+        spriteId = intro_create_brendan_sprite(0x110, 100);
+    else
+        spriteId = intro_create_may_sprite(0x110, 100);
+    gSprites[spriteId].callback = sub_813D788;
+    gSprites[spriteId].anims = gUnknown_0840AE80;
+    gTasks[taskId].data[1] = spriteId;
+#ifdef SAPPHIRE
+    spriteId = intro_create_latias_sprite(-0x40, 0x3C);
+#else
+    spriteId = intro_create_latios_sprite(-0x40, 0x3C);
+#endif
+    gSprites[spriteId].callback = sub_813D880;
+    gTasks[taskId].data[2] = spriteId;
+    BeginNormalPaletteFade(0xFFFFFFFF, 0, 0x10, 0, 0xFFFF);
+    SetVBlankCallback(VBlankCB_Intro);
+#ifdef SAPPHIRE
+    gTasks[taskId].data[0] = sub_8148EC0(0, 0x4000, 0x40, 0x10);
+    sub_8148C78(0);
+#else
+    gTasks[taskId].data[0] = sub_8148EC0(1, 0x4000, 0x400, 0x10);
+    sub_8148C78(1);
+#endif
+    gTasks[taskId].func = task_intro_8;
+}
+
+static void task_intro_8(u8 taskId)
+{
+    s16 a;
+    u16 sine;
+    
+    if (gIntroFrameCounter > 1823)
+    {
+        BeginNormalPaletteFade(0xFFFFFFFF, 0x10, 0, 0x10, 0xFFFF);
+        gTasks[taskId].func = task_intro_9;
+    }
+    if (gIntroFrameCounter == 1109)
+        gSprites[gTasks[taskId].data[1]].data0 = 1;
+    if (gIntroFrameCounter == 1214)
+        gSprites[gTasks[taskId].data[1]].data0 = 0;
+    if (gIntroFrameCounter == 1394)
+        gSprites[gTasks[taskId].data[2]].data0 = 1;
+    if (gIntroFrameCounter == 1398)
+        gSprites[gTasks[taskId].data[1]].data0 = 2;
+    if (gIntroFrameCounter == 1586)
+        gSprites[gTasks[taskId].data[1]].data0 = 3;
+    if (gIntroFrameCounter == 1727)
+        gSprites[gTasks[taskId].data[1]].data0 = 4;
+    
+    //TODO: Clean this up
+    a = (((u16)gTasks[taskId].data[3] << 16) >> 18) & 0x7F;
+    sine = Sin(a, 0x30);
+    gUnknown_0203935A = sine;
+    if (gTasks[taskId].data[3] < 0x200)
+        gTasks[taskId].data[3]++;
+#ifdef SAPPHIRE
+    sub_8149020(0);
+#else
+    sub_8149020(1);
+#endif
+}
+
+static void task_intro_9(u8 taskId)
+{
+    if (gIntroFrameCounter > 2068)
+    {
+        DestroyTask(gTasks[taskId].data[0]);
+        gTasks[taskId].func = task_intro_10;
+    }
+}
+
+static void task_intro_10(u8 taskId)
+{
+    intro_reset_and_hide_bgs();
+    LZ77UnCompVram(gUnknown_08409C04, (void *)VRAM);
+    LZ77UnCompVram(gUnknown_08409AD4, (void *)(VRAM + 0x4000));
+    LoadPalette(gUnknown_084098D4, 0, 0x200);
+    gTasks[taskId].data[0] = 0;
+    gTasks[taskId].data[1] = 0;
+    gTasks[taskId].data[2] = 0;
+    gTasks[taskId].data[3] = 0;
+    sub_813CE30(0x78, 0x50, 0, 0);
+    ResetSpriteData();
+    FreeAllSpritePalettes();
+    BeginNormalPaletteFade(0xFFFFFFFF, 0, 0x10, 0, 0xFFFF);
+    REG_BG2CNT = 0x4883;
+    REG_DISPCNT = DISPCNT_MODE_1 | DISPCNT_OBJ_1D_MAP | DISPCNT_BG2_ON | DISPCNT_OBJ_ON;
+    gTasks[taskId].func = task_intro_11;
+    gIntroFrameCounter = 0;
+    m4aSongNumStart(0x1BA);
+}
+
+static void task_intro_11(u8 taskId)
+{
+    gTasks[taskId].data[0] += 0x400;
+    if (gTasks[taskId].data[1] <= 0x6BF)
+    {
+        gTasks[taskId].data[1] += gTasks[taskId].data[2];
+        gTasks[taskId].data[2]++;
+    }
+    else
+    {
+        gTasks[taskId].func = task_intro_12;
+    }
+    sub_813CE30(0x78, 0x50, 0x10000 / gTasks[taskId].data[1], gTasks[taskId].data[0]);
+    if (gIntroFrameCounter == 44)
+        BeginNormalPaletteFade(0xFFFFFFFF, 0, 0, 0x10, 0xFFFF);
+}
+
+static void task_intro_12(u8 taskId)
+{
+    if (gIntroFrameCounter > 59)
+        gTasks[taskId].func = task_intro_13;
+}
+
+extern u8 unk_2000000[][32];
+
+static void task_intro_13(u8 taskId)
+{
+    u16 i;
+    void *vram;
+    
+    intro_reset_and_hide_bgs();
+    for (i = 0; i < 32; i++)
+    {
+        unk_2000000[0][i] = 0;
+        unk_2000000[1][i] = 17;
+        unk_2000000[2][i] = 34;
+    }
+    vram = (void *)VRAM;
+    DmaCopy16(3, unk_2000000, vram, 0x60);
+    for (i = 0; i < 0x280; i++)
+        ((u16 *)(VRAM + 0x3000))[i] = 0xF001;
+    for (i = 0; i < 0x80; i++)
+        ((u16 *)(VRAM + 0x3800))[i] = 0xF002;
+    for (i = 0; i < 0x180; i++)
+        ((u16 *)(VRAM + 0x3900))[i] = 0xF000;
+    for (i = 0; i < 0x80; i++)
+        ((u16 *)(VRAM + 0x3C00))[i] = 0xF002;
+    gPlttBufferUnfaded[0xF0] = RGB_WHITE;
+    gPlttBufferFaded[0xF0] = RGB_WHITE;
+    sub_813D084(1);
+    gPlttBufferUnfaded[0xF2] = RGB_BLACK;
+    gPlttBufferFaded[0xF2] = RGB_BLACK;
+    LZ77UnCompVram(gUnknown_0840A778, (void *)(VRAM + 0x4000));
+    LZ77UnCompVram(gUnknown_0840A7E4, (void *)(VRAM + 0x7000));
+    LoadPalette(gUnknown_0840A758, 0, 0x20);
+    ResetSpriteData();
+    FreeAllSpritePalettes();
+    gReservedSpritePaletteCount = 8;
+    LoadCompressedObjectPic(&gUnknown_0840B20C);
+    LoadCompressedObjectPic(&gUnknown_0840B21C);
+    LoadCompressedObjectPalette(&gUnknown_0840B22C);
+    LoadSpritePalettes(gUnknown_0840B23C);
+    gTasks[taskId].func = task_intro_14;
+}
+
+static void task_intro_14(u8 taskId)
+{
+    u8 newTaskId;
+    
+    REG_WIN0H = 0xF0;
+    REG_WIN0V = 0xA0;
+    REG_WININ = 0x1C;
+    REG_WINOUT = 0x1D;
+    REG_BG3CNT = 0x603;
+    REG_BG0CNT = 0x700;
+    REG_DISPCNT = DISPCNT_MODE_0 | DISPCNT_OBJ_1D_MAP | DISPCNT_BG0_ON | DISPCNT_BG3_ON | DISPCNT_OBJ_ON | DISPCNT_WIN0_ON;
+    gTasks[taskId].data[15] = CreateTask(sub_813CAF4, 0);
+    gTasks[gTasks[taskId].data[15]].data[0] = 0;
+    gTasks[taskId].data[0] = 0;
+    gTasks[taskId].func = task_intro_15;
+}
+
+static void task_intro_15(u8 taskId)
+{
+    u16 foo = gTasks[taskId].data[0];
+    
+    if (gTasks[taskId].data[0] != 32)
+    {
+        u32 bar; //needed to match for some reason
+        
+        gTasks[taskId].data[0] += 4;
+        REG_WIN0V = (gTasks[taskId].data[0] * 256) - (bar = foo - 0x9C);
+    }
+    else
+    {
+        REG_WIN0V = 0x2080;
+        gTasks[taskId].func = task_intro_16;
+    }
+}
+
+static void task_intro_16(u8 taskId)
+{
+    gTasks[taskId].func = task_intro_17;
+}
+
+static void task_intro_17(u8 taskId)
+{
+    gUnknown_0203931A = 0;
+    gTasks[taskId].func = Task_IntroPokemonBattle;
+}
+
+static void Task_IntroPokemonBattle(u8 taskId)
+{
+    u8 spriteId;
+    
+    if (gIntroFrameCounter == 80)
+    {
+        spriteId = sub_813CE88(SPECIES_SHARPEDO, 0xF0, 0xA0, 5, 1);
+        gSprites[spriteId].callback = sub_813DB9C;
+        gSprites[spriteId].data1 = 1;
+        gSprites[spriteId].data2 = 0;
+    }
+    if (gIntroFrameCounter == 152)
+    {
+        spriteId = sub_813CE88(SPECIES_DUSKULL, 0, 0xA0, 4, 1);
+        gSprites[spriteId].callback = sub_813DB9C;
+        gSprites[spriteId].data1 = 2;
+        gSprites[spriteId].data2 = 1;
+    }
+    if (gIntroFrameCounter == 219)
+    {
+        sub_813D084(0);
+        spriteId = sub_813CFA8(gUnknown_02039318, 0x110, 0x60, 6);
+        gSprites[spriteId].callback = sub_813DE70;
+        gTasks[taskId].data[1] = spriteId;
+    }
+    if (gIntroFrameCounter == 304)
+    {
+        gTasks[gTasks[taskId].data[15]].data[0] = 4;
+        gSprites[gTasks[taskId].data[1]].data0 = 2;
+    }
+    if (gIntroFrameCounter == 384)
+    {
+        gTasks[gTasks[taskId].data[15]].data[0] = 0;
+        gSprites[gTasks[taskId].data[1]].data0 = 4;
+    }
+    if (gIntroFrameCounter == 400)
+    {
+        BeginNormalPaletteFade(0xFF0000, 0, 0x10, 0, 0x7EFF);
+    }
+    if (gIntroFrameCounter == 432)
+    {
+        gSprites[gTasks[taskId].data[1]].data0 = 5;
+    }
+    if (gIntroFrameCounter == 462)
+    {
+        gSprites[gTasks[taskId].data[1]].data0 = 6;
+        gTasks[gTasks[taskId].data[15]].data[0] = 2;
+    }
+    if (gIntroFrameCounter == 463)
+    {
+        sub_813D084(1);
+        spriteId = sub_813CE88(SPECIES_SHARPEDO, 0xD0, 8, 5, 1);
+        gSprites[spriteId].callback = sub_813E10C;
+        gTasks[taskId].data[2] = spriteId;
+        sub_813E7C0(spriteId);
+    }
+    if (gIntroFrameCounter == 539)
+    {
+        spriteId = sub_813CE88(SPECIES_DUSKULL, 0xF8, 0x10, 4, 1);
+        gSprites[spriteId].callback = sub_813E10C;
+        gTasks[taskId].data[3] = spriteId;
+        sub_813E930(spriteId);
+    }
+    if (gIntroFrameCounter == 623)
+    {
+        gSprites[gTasks[taskId].data[2]].data0 = 2;
+        gSprites[gTasks[taskId].data[3]].data0 = 2;
+        gTasks[gTasks[taskId].data[15]].data[0] = 3;
+    }
+    if (gIntroFrameCounter == 624)
+    {
+        sub_813D084(0);
+        spriteId = sub_813CE88(SPECIES_MUDKIP, 0x20, 0x98, 0, 0);
+        gSprites[spriteId].callback = sub_813E210;
+        gTasks[taskId].data[4] = spriteId;
+        sub_813EDBC(spriteId);
+    }
+    if (gIntroFrameCounter == 700)
+    {
+        spriteId = sub_813CE88(SPECIES_TORCHIC, -8, 0x90, 1, 0);
+        gSprites[spriteId].callback = sub_813E210;
+        gTasks[taskId].data[5] = spriteId;
+        sub_813EB4C(spriteId);
+    }
+    if (gIntroFrameCounter == 776)
+    {
+        gUnknown_0203931A = 1;
+        gSprites[gTasks[taskId].data[4]].data0 = 2;
+        gSprites[gTasks[taskId].data[5]].data0 = 2;
+        gTasks[gTasks[taskId].data[15]].data[0] = 0;
+    }
+    if (gIntroFrameCounter == 781)
+    {
+        sub_813D084(2);
+        gSprites[gTasks[taskId].data[2]].data0 = 3;
+        gSprites[gTasks[taskId].data[3]].data0 = 3;
+        gSprites[gTasks[taskId].data[4]].data0 = 3;
+        gSprites[gTasks[taskId].data[5]].data0 = 3;
+        spriteId = CreateSprite(&gSpriteTemplate_840B1F4, 0x78, 0x50, 15);
+        gSprites[spriteId].invisible = 1;
+    }
+    if (gIntroFrameCounter == 800)
+        PlaySE(SE_OP_BASYU);
+    if (gIntroFrameCounter == 850)
+        BeginNormalPaletteFade(0xFFFFFFFF, 4, 0, 0x10, 0xFFFF);
+    if (gIntroFrameCounter == 946)
+        gTasks[taskId].func = task_intro_19;
+}
+
+static void task_intro_19(u8 taskId)
+{
+    DestroyTask(taskId);
+    SetMainCallback2(MainCB2_EndIntro);
+}
diff --git a/src/sprite.c b/src/sprite.c
index 12c62145e..c91476f51 100644
--- a/src/sprite.c
+++ b/src/sprite.c
@@ -57,7 +57,7 @@ static void BuildSpritePriorities(void);
 static void SortSprites(void);
 static void CopyMatricesToOamBuffer(void);
 static void AddSpritesToOamBuffer(void);
-static u8 CreateSpriteAt(u8 index, struct SpriteTemplate *template, s16 x, s16 y, u8 subpriority);
+static u8 CreateSpriteAt(u8 index, const struct SpriteTemplate *template, s16 x, s16 y, u8 subpriority);
 static void ClearSpriteCopyRequests(void);
 static void ResetOamMatrices(void);
 static void ResetSprite(struct Sprite *sprite);
@@ -530,7 +530,7 @@ static void AddSpritesToOamBuffer(void)
     }
 }
 
-u8 CreateSprite(struct SpriteTemplate *template, s16 x, s16 y, u8 subpriority)
+u8 CreateSprite(const struct SpriteTemplate *template, s16 x, s16 y, u8 subpriority)
 {
     u8 i;
 
@@ -541,7 +541,7 @@ u8 CreateSprite(struct SpriteTemplate *template, s16 x, s16 y, u8 subpriority)
     return MAX_SPRITES;
 }
 
-u8 CreateSpriteAtEnd(struct SpriteTemplate *template, u16 x, u16 y, u8 subpriority)
+u8 CreateSpriteAtEnd(const struct SpriteTemplate *template, u16 x, u16 y, u8 subpriority)
 {
     s16 i;
 
@@ -554,7 +554,7 @@ u8 CreateSpriteAtEnd(struct SpriteTemplate *template, u16 x, u16 y, u8 subpriori
 
 u8 CreateInvisibleSprite(void (*callback)(struct Sprite *))
 {
-    u8 index = CreateSprite((struct SpriteTemplate *)&gDummySpriteTemplate, 0, 0, 31);
+    u8 index = CreateSprite(&gDummySpriteTemplate, 0, 0, 31);
 
     if (index == MAX_SPRITES)
     {
@@ -568,7 +568,7 @@ u8 CreateInvisibleSprite(void (*callback)(struct Sprite *))
     }
 }
 
-static u8 CreateSpriteAt(u8 index, struct SpriteTemplate *template, s16 x, s16 y, u8 subpriority)
+static u8 CreateSpriteAt(u8 index, const struct SpriteTemplate *template, s16 x, s16 y, u8 subpriority)
 {
     struct Sprite *sprite = &gSprites[index];
 
@@ -1635,7 +1635,7 @@ void FreeAllSpritePalettes(void)
         sSpritePaletteTags[i] = 0xFFFF;
 }
 
-u8 LoadSpritePalette(struct SpritePalette *palette)
+u8 LoadSpritePalette(const struct SpritePalette *palette)
 {
     u8 index = IndexOfSpritePaletteTag(palette->tag);
 
@@ -1656,7 +1656,7 @@ u8 LoadSpritePalette(struct SpritePalette *palette)
     }
 }
 
-void LoadSpritePalettes(struct SpritePalette *palettes)
+void LoadSpritePalettes(const struct SpritePalette *palettes)
 {
     u8 i;
     for (i = 0; palettes[i].data != NULL; i++)