begin decompiling intro functions

Makefile

@@ -48,7 +48,8 @@ C_OBJS := $(C_SRCS:%.c=%.o)
 
 ASM_OBJS := asm/crt0.o asm/rom3.o asm/rom_8040EB4.o asm/rom4.o asm/rom_8074BAC.o asm/rom5.o asm/rom6.o\
 asm/libgcnmultiboot.o asm/m4a_1.o asm/m4a_3.o asm/libagbsyscall.o \
-asm/rom_8072DF8.o asm/rom_8065394.o asm/rom_803D1FC.o asm/rom_803BA2C.o
+asm/rom_8072DF8.o asm/rom_8065394.o asm/rom_803D1FC.o asm/rom_803BA2C.o \
+asm/rom_813BA94.o
 
 DATA_ASM_OBJS := data/data2.o data/graphics.o data/sound_data.o \
 data/event_scripts.o data/battle_anim_scripts.o \

ld_script.txt

@@ -76,6 +76,8 @@ SECTIONS {
         src/starter_choose.o(.text);
         src/wallclock.o(.text);
         asm/rom6.o(.text);
+        src/intro.o(.text);
+        asm/rom_813BA94.o(.text);
     } =0
 
     script_data :

src/intro.c

@@ -0,0 +1,147 @@
+#include "global.h"
+#include "main.h"
+#include "palette.h"
+#include "task.h"
+#include "link.h"
+
+struct GcmbStruct
+{
+    u16 gcmb_field_0;
+    u8 gcmb_field_2;
+};
+
+extern s32 gUnknown_03005ED0;
+extern struct GcmbStruct gUnknown_03005EE0;
+extern u16 gSaveFileStatus;
+
+extern const u8 gIntroCopyright_Gfx[];
+extern const u16 gIntroCopyright_Pal[];
+extern const u16 gIntroCopyright_Tilemap[];
+
+extern void CB2_InitTitleScreen(void);
+
+void CB2_813B7EC(void);
+void task_intro_1(u8);
+
+void sub_813B784(void)
+{
+    LoadOam();
+    ProcessSpriteCopyRequests();
+    TransferPlttBuffer();
+}
+
+void CB2_813B798(void)
+{
+    RunTasks();
+    AnimateSprites();
+    BuildOamBuffer();
+    UpdatePaletteFade();
+    if (gMain.newKeys && !gPaletteFade.active)
+        SetMainCallback2(CB2_813B7EC);
+    else if (gUnknown_03005ED0 != -1)
+        gUnknown_03005ED0++;
+}
+
+void CB2_813B7EC(void)
+{
+    if (!UpdatePaletteFade())
+        SetMainCallback2(CB2_InitTitleScreen);
+}
+
+void sub_813B808(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)
+{
+    GameCubeMultiBoot_HandleSerialInterrupt(&gUnknown_03005EE0);
+}
+
+u8 SetUpCopyrightScreen(void)
+{
+    u16 ime;
+
+    switch (gMain.state)
+    {
+    case 0:
+        SetVBlankCallback(NULL);
+        REG_BLDCNT = 0;
+        REG_BLDALPHA = 0;
+        REG_BLDY = 0;
+        *(u16 *)PLTT = 0x7FFF;
+        REG_DISPCNT = 0;
+        REG_BG0HOFS = 0;
+        REG_BG0VOFS = 0;
+        DmaFill16(3, 0, (void *)VRAM, VRAM_SIZE);
+        DmaFill32(3, 0, (void *)OAM, OAM_SIZE);
+        DmaFill16(3, 0, (void *)(PLTT + 2), PLTT_SIZE - 2);
+        ResetPaletteFade();
+        sub_813B808(0, 14336, 0);
+        remove_some_task();
+        ResetTasks();
+        ResetSpriteData();
+        FreeAllSpritePalettes();
+        BeginNormalPaletteFade(0xFFFFFFFF, 0, 0x10, 0, 0xFFFF);
+        REG_BG0CNT = 1792;
+        ime = REG_IME;
+        REG_IME = 0;
+        REG_IE |= INTR_FLAG_VBLANK;
+        REG_IME = ime;
+        REG_DISPSTAT |= 8;
+        SetVBlankCallback(sub_813B784);
+        REG_DISPCNT = 320;
+        SetSerialCallback(SerialCb_CopyrightScreen);
+        GameCubeMultiBoot_Init(&gUnknown_03005EE0);
+    default:
+        UpdatePaletteFade();
+        gMain.state++;
+        GameCubeMultiBoot_Main(&gUnknown_03005EE0);
+        break;
+    case 140:
+        GameCubeMultiBoot_Main(&gUnknown_03005EE0);
+        if (gUnknown_03005EE0.gcmb_field_2 != 1)
+        {
+            BeginNormalPaletteFade(0xFFFFFFFFu, 0, 0, 0x10, 0);
+            gMain.state++;
+        }
+        break;
+    case 141:
+        if (UpdatePaletteFade())
+            break;
+        CreateTask(task_intro_1, 0);
+        SetMainCallback2(CB2_813B798);
+        if (gUnknown_03005EE0.gcmb_field_2)
+        {
+            GameCubeMultiBoot_ExecuteProgram(&gUnknown_03005EE0);
+        }
+        else
+        {
+            GameCubeMultiBoot_Quit();
+            SetSerialCallback(SerialCB);
+        }
+        return 0;
+    }
+
+    return 1;
+}
+
+void c2_copyright_1(void)
+{
+    if (!SetUpCopyrightScreen())
+    {
+        sub_8052E4C();
+        sub_81251B8();
+        sub_8125EC8(0);
+        if (gSaveFileStatus == 0 || gSaveFileStatus == 2)
+            ClearSav2();
+        SetPokemonCryStereo(gSaveBlock2.optionsSound);
+    }
+}
+
+void sub_813BA88(void)
+{
+    SetUpCopyrightScreen();
+}