Decompile a chunk of titlescreen.s

2 files changed, 581 insertions, 3 deletions

diff --git a/src/main.c b/src/main.c
index 1d02a13..1f5dc58 100755
--- a/src/main.c
+++ b/src/main.c
@@ -1,7 +1,7 @@
 #include "global.h"
 #include "main.h"
 
-void sub_23C(u8 mainState)
+void SetMainGameState(u16 mainState)
 {
 	gMain.mainState = mainState;
 	gMain.subState = 0;
diff --git a/src/titlescreen.c b/src/titlescreen.c
index 9de231d..c3e51a1 100755
--- a/src/titlescreen.c
+++ b/src/titlescreen.c
@@ -3,6 +3,9 @@
 #include "m4a.h"
 #include "main.h"
 
+extern u8 gUnknown_03000000[];
+
+
 extern StateFunc gTitlescreenStateFuncs[];
 extern const u8 gTitlescreenBg_Gfx[];
 extern const u16 gTitlescreenBg_Pals[];
@@ -12,14 +15,39 @@ extern const u8 gTitlescreenSpritesSavedGame_Gfx[];
 extern const u8 gTitlescreenSpritesNoSavedGame_Gfx[];
 extern const u8 gGBAButtonIcons_Pals[];
 extern const u8 gOptionsSprites_Gfx[];
+extern const u8 *const gUnknown_086A975C[7];
+extern const u8 *const gUnknown_086A96F8[7];
+extern const s16 gUnknown_086A964C[];
+extern const s8 gUnknown_086A9662[];
+extern const s8 gUnknown_086A9666[6][2];
+extern const s8 gUnknown_086A9748[];
+extern const u8 *const gUnknown_086A9714[];
+extern const u8 *const gUnknown_086A9778[];
+extern const s8 gUnknown_086A9672[9][2];
+extern const u16 gUnknown_086A96A4[];
+extern const u16 gUnknown_086A96D4[];
 
+extern void sub_2B4(void);
 extern void sub_438(void);
 extern void sub_CBC(void);
+extern void sub_D10(void);
+extern void sub_FE04(void (*func)(void));
 extern void sub_FD5C(void (*func)(void));
+extern void sub_10708(void*, void*, u16, s16);
 extern void sub_11640(void);
 extern void sub_52C44(void);
 
 extern void sub_10AC0(void);
+extern void sub_1157C(void);
+extern void sub_1175C(void);
+extern void sub_11968(void);
+extern void sub_11B74(void);
+
+static void sub_114FC(void);
+
+// If the user doesn't press any buttons at the title screen,
+// it will transition to a demo gameplay experience.
+#define NUM_IDLE_FRAMES 1800
 
 
 void TitlescreenMain(void)
@@ -63,8 +91,8 @@ void LoadTitlescreenGraphics(void)
     if (autoDisplayMenu == 1)
     {
         gUnknown_202BE24 = 0;
-        gUnknown_2002888.unk9 = 0;
-        gUnknown_2002888.unkB = autoDisplayMenu;
+        gTitlescreen.unk9 = 0;
+        gTitlescreen.unkB = autoDisplayMenu;
         gMain.subState = 3;
         sub_CBC();
         sub_FD5C(NULL);
@@ -78,3 +106,553 @@ void LoadTitlescreenGraphics(void)
 
     m4aSongNumStart(1);
 }
+
+void sub_10AC0(void)
+{
+    int i;
+
+    gTitlescreen.unk4 = 0;
+    gTitlescreen.unk2 = 0;
+    gTitlescreen.unk6 = 0;
+    gTitlescreen.unk8 = 0;
+    gTitlescreen.unk10 = 4;
+    gTitlescreen.unk9 = 1;
+    gTitlescreen.unk11 = 0;
+    gTitlescreen.unkA = 6;
+    gTitlescreen.unkC = 0;
+    gTitlescreen.unkE = 3;
+    gTitlescreen.unkB = 0;
+    gTitlescreen.unkD = 0;
+    gTitlescreen.unkF = 0;
+    gUnknown_0202C588 = 1;
+    gUnknown_020028A0 = 0;
+    gUnknown_020028A1 = 0;
+    gUnknown_020028A2 = 0;
+    gUnknown_020028A3 = 0;
+
+    if (gMain.unk40 == 1)
+    {
+        for (i = 0; i < 7; i++)
+            gUnknown_0202BE00[i] = gUnknown_086A975C[i];
+
+        gTitlescreen.menuCursorIndex = 1;
+        gTitlescreen.unk7 = 1;
+    }
+    else
+    {
+        for (i = 0; i < 7; i++)
+            gUnknown_0201C190[i] = gUnknown_086A96F8[i];
+
+        gTitlescreen.menuCursorIndex = 0;
+        gTitlescreen.unk7 = 0;
+        gMain.unkD = 0;
+    }
+
+    gTitlescreen.idleFramesCounter = 0;
+    gTitlescreen.idleFadeoutCounter = 1;
+    gUnknown_020028A4 = 0;
+    if ((gMain.heldKeys & (A_BUTTON | B_BUTTON | SELECT_BUTTON | START_BUTTON))
+                       == (A_BUTTON | B_BUTTON | SELECT_BUTTON | START_BUTTON))
+        gUnknown_020028A5 = 1;
+    else
+        gUnknown_020028A5 = 0;
+
+    gUnknown_202BE24 = 0;
+}
+
+void sub_10BB8(void)
+{
+    if ((gMain.heldKeys & (A_BUTTON | B_BUTTON | SELECT_BUTTON | START_BUTTON))
+                       == (A_BUTTON | B_BUTTON | SELECT_BUTTON | START_BUTTON))
+    {
+        if (!gUnknown_020028A5)
+        {
+            gUnknown_020028A4 = 1;
+            gTitlescreen.unk6 = 9;
+            gMain.subState = 11;
+        }
+    }
+    else
+    {
+        gUnknown_020028A5 = 0;
+    }
+
+    if (!gUnknown_020028A4)
+    {
+        gTitlescreen.unk4++;
+        if (gTitlescreen.unk4 >= gUnknown_086A9662[gTitlescreen.unk8])
+        {
+            gTitlescreen.unk4 = 0;
+            if (++gTitlescreen.unk8 > 3)
+                gTitlescreen.unk8 = 0;
+        }
+
+        if (gMain.heldKeys & KEYS_MASK)
+            gTitlescreen.idleFramesCounter = 0;
+
+        if (gMain.newKeys & (A_BUTTON | START_BUTTON))
+        {
+            m4aSongNumStart(0x65);
+            gTitlescreen.unk4 = 0;
+            gTitlescreen.unk2 = 0;
+            gMain.subState = 2;
+        }
+
+        sub_114FC();
+        sub_1157C();
+
+        gTitlescreen.idleFramesCounter++;
+        if (gTitlescreen.idleFramesCounter > NUM_IDLE_FRAMES)
+        {
+            if (gTitlescreen.idleFramesCounter % 10 == 0)
+            {
+                gTitlescreen.idleFadeoutCounter++;
+                m4aMPlayVolumeControl(&gMPlayInfo_02032EE0, 0xFFFF, 0x100 / gTitlescreen.idleFadeoutCounter);
+            }
+
+            if (gTitlescreen.idleFadeoutCounter > 9)
+            {
+                gTitlescreen.idleFramesCounter = 0;
+                gTitlescreen.unk6 = 7;
+                gMain.subState = 11;
+            }
+        }
+    }
+
+    sub_11640();
+}
+
+void sub_10CF0(void)
+{
+    if ((gMain.heldKeys & (A_BUTTON | B_BUTTON | SELECT_BUTTON | START_BUTTON))
+                       == (A_BUTTON | B_BUTTON | SELECT_BUTTON | START_BUTTON))
+    {
+        gUnknown_020028A4 = 1;
+        gTitlescreen.unk6 = 9;
+        gMain.subState = 11;
+    }
+
+    if (!gUnknown_020028A4)
+    {
+        gTitlescreen.unk4++;
+        if (gTitlescreen.unk4 >= gUnknown_086A9666[gTitlescreen.unk2][1])
+        {
+            gTitlescreen.unk4 = 0;
+            gTitlescreen.unk8 = gUnknown_086A9666[gTitlescreen.unk2][0];
+            if (++gTitlescreen.unk2 > 5)
+            {
+                gTitlescreen.unk2 = 0;
+                gUnknown_202BE24 = 0;
+                gTitlescreen.unk9 = 0;
+                gTitlescreen.unkB = 1;
+                gMain.subState = 3;
+            }
+        }
+    }
+
+    sub_11640();
+}
+
+void sub_10D84(void)
+{
+    if ((gMain.heldKeys & (A_BUTTON | B_BUTTON | SELECT_BUTTON | START_BUTTON))
+                       == (A_BUTTON | B_BUTTON | SELECT_BUTTON | START_BUTTON))
+    {
+        gUnknown_020028A4 = 1;
+        gTitlescreen.unk6 = 9;
+        gMain.subState = 10;
+    }
+
+    if (!gUnknown_020028A4)
+    {
+        if (gMain.newKeys & A_BUTTON)
+        {
+            m4aSongNumStart(0x65);
+            sub_11B74();
+            sub_2B4();
+            m4aMPlayAllStop();
+            sub_D10();
+            gMain.subState = 0;
+        }
+        else if (gMain.newKeys & B_BUTTON)
+        {
+            m4aSongNumStart(0x66);
+            gTitlescreen.unk11 = 0;
+            gMain.subState = 1;
+        }
+    }
+
+    sub_11640();
+}
+
+void sub_10E00(void)
+{
+    if ((gMain.heldKeys & (A_BUTTON | B_BUTTON | SELECT_BUTTON | START_BUTTON))
+                       == (A_BUTTON | B_BUTTON | SELECT_BUTTON | START_BUTTON))
+    {
+        gUnknown_020028A4 = 1;
+        gTitlescreen.unk6 = 9;
+        gMain.subState = 11;
+    }
+
+    if (!gUnknown_020028A4)
+    {
+        if (!gTitlescreen.unk7)
+        {
+            gTitlescreen.unk4++;
+            if (gTitlescreen.unk4 >= gUnknown_086A9748[gTitlescreen.unk2])
+            {
+                gTitlescreen.unk4 = 0;
+                gUnknown_0201C190[6] = gUnknown_086A9714[gTitlescreen.unk2];
+                if (++gTitlescreen.unk2 > 11)
+                {
+                    gTitlescreen.unk2 = 0;
+                    gTitlescreen.unkD = 1;
+                    gTitlescreen.unkF = 1;
+                    gMain.subState = 4;
+                }
+            }
+
+            sub_1175C();
+        }
+        else
+        {
+            gTitlescreen.unk4++;
+            if (gTitlescreen.unk4 >= gUnknown_086A9748[gTitlescreen.unk2])
+            {
+                gTitlescreen.unk4 = 0;
+                gUnknown_0202BE00[6] = gUnknown_086A9778[gTitlescreen.unk2];
+                if (++gTitlescreen.unk2 > 11)
+                {
+                    gTitlescreen.unk2 = 0;
+                    gTitlescreen.unkD = 1;
+                    gTitlescreen.unkF = 1;
+                    gMain.subState = 5;
+                }
+            }
+
+            sub_11968();
+        }
+    }
+}
+
+void sub_10EF4(void)
+{
+    if ((gMain.heldKeys & (A_BUTTON | B_BUTTON | SELECT_BUTTON | START_BUTTON))
+                       == (A_BUTTON | B_BUTTON | SELECT_BUTTON | START_BUTTON))
+    {
+        gUnknown_020028A4 = 1;
+        gTitlescreen.unk6 = 9;
+        gMain.subState = 10;
+    }
+
+    if (!gUnknown_020028A4)
+    {
+        gTitlescreen.unk4++;
+        if (gTitlescreen.unk4 >= gUnknown_086A9672[gTitlescreen.unk2][1])
+        {
+            gTitlescreen.unk4 = 0;
+            if (++gTitlescreen.unk2 > 6)
+                gTitlescreen.unk2 = 0;
+
+            gTitlescreen.unkC = gUnknown_086A9672[gTitlescreen.unk2][0];
+            gTitlescreen.unkE = gUnknown_086A9672[gTitlescreen.unk2][0] + 3;
+        }
+
+        if (gMain.newKeys & DPAD_UP)
+        {
+            m4aSongNumStart(0x67);
+            if (--gTitlescreen.menuCursorIndex < 0)
+                gTitlescreen.menuCursorIndex = 3;
+        }
+        else if (gMain.newKeys & DPAD_DOWN)
+        {
+            m4aSongNumStart(0x67);
+            if (++gTitlescreen.menuCursorIndex > 3)
+                gTitlescreen.menuCursorIndex = 0;
+        }
+
+        if (gMain.newKeys & (A_BUTTON | START_BUTTON))
+        {
+            m4aSongNumStart(0x65);
+            gTitlescreen.unk4 = 0;
+            gTitlescreen.unk2 = 0;
+            gMain.subState = 7;
+        }
+        else if (gMain.newKeys & B_BUTTON)
+        {
+            m4aSongNumStart(0x66);
+            gTitlescreen.unk4 = 0;
+            gTitlescreen.unk2 = 12;
+            gTitlescreen.unkD = 0;
+            gTitlescreen.unkF = 0;
+            gMain.subState = 6;
+        }
+
+        sub_1157C();
+    }
+
+    sub_1175C();
+}
+
+void sub_11020(void)
+{
+    if ((gMain.heldKeys & (A_BUTTON | B_BUTTON | SELECT_BUTTON | START_BUTTON))
+                       == (A_BUTTON | B_BUTTON | SELECT_BUTTON | START_BUTTON))
+    {
+        gUnknown_020028A4 = 1;
+        gTitlescreen.unk6 = 9;
+        gMain.subState = 11;
+    }
+
+    if (!gUnknown_020028A4)
+    {
+        u16 unk4 = gTitlescreen.unk4;
+        u16 mask = 0x3;
+        if (!(unk4 & mask))
+        {
+            if (!gTitlescreen.unk2)
+            {
+                gTitlescreen.unk2 = 1;
+                sub_10708((void *)(OBJ_VRAM0 + 0x1E0 + gTitlescreen.menuCursorIndex * 0x800), gUnknown_03000000, 8, 2);
+                sub_10708((void *)(OBJ_VRAM0 + 0x61E0), (void *)(OBJ_VRAM0 + 0x1E0 + gTitlescreen.menuCursorIndex * 0x800), 8, 2);
+            }
+            else
+            {
+                gTitlescreen.unk2 = 0;
+                sub_10708(gUnknown_03000000, (void *)(OBJ_VRAM0 + 0x1E0 + gTitlescreen.menuCursorIndex * 0x800), 8, 2);
+            }
+        }
+
+        if (gTitlescreen.unk4 > 20)
+        {
+            gMain.unkD = 0;
+            gTitlescreen.unk6 = gUnknown_086A96A4[gTitlescreen.menuCursorIndex];
+            gMain.subState = 10;
+        }
+
+        gTitlescreen.unk4++;
+    }
+
+    sub_1175C();
+}
+
+void sub_110FC(void)
+{
+    if ((gMain.heldKeys & (A_BUTTON | B_BUTTON | SELECT_BUTTON | START_BUTTON))
+                       == (A_BUTTON | B_BUTTON | SELECT_BUTTON | START_BUTTON))
+    {
+        gUnknown_020028A4 = 1;
+        gTitlescreen.unk6 = 9;
+        gMain.subState = 10;
+    }
+
+    if (!gUnknown_020028A4)
+    {
+        gTitlescreen.unk4++;
+        if (gTitlescreen.unk4 >= gUnknown_086A9672[gTitlescreen.unk2][1])
+        {
+            gTitlescreen.unk4 = 0;
+            if (++gTitlescreen.unk2 > 6)
+                gTitlescreen.unk2 = 0;
+
+            gTitlescreen.unkC = gUnknown_086A9672[gTitlescreen.unk2][0];
+            gTitlescreen.unkE = gUnknown_086A9672[gTitlescreen.unk2][0] + 3;
+        }
+
+        if (gMain.newKeys & DPAD_UP)
+        {
+            m4aSongNumStart(0x67);
+            if (--gTitlescreen.menuCursorIndex < 0)
+                gTitlescreen.menuCursorIndex = 4;
+        }
+        else if (gMain.newKeys & DPAD_DOWN)
+        {
+            m4aSongNumStart(0x67);
+            if (++gTitlescreen.menuCursorIndex > 4)
+                gTitlescreen.menuCursorIndex = 0;
+        }
+
+        if (gMain.newKeys & (A_BUTTON | START_BUTTON))
+        {
+            m4aSongNumStart(0x65);
+            gTitlescreen.unk4 = 0;
+            gTitlescreen.unk2 = 0;
+            gMain.subState = 8;
+        }
+        else if (gMain.newKeys & B_BUTTON)
+        {
+            m4aSongNumStart(0x66);
+            gTitlescreen.unk4 = 0;
+            gTitlescreen.unk2 = 12;
+            gTitlescreen.unkD = 0;
+            gTitlescreen.unkF = 0;
+            gMain.subState = 6;
+        }
+
+        sub_1157C();
+    }
+
+    sub_11968();
+}
+
+void sub_11228(void)
+{
+    if ((gMain.heldKeys & (A_BUTTON | B_BUTTON | SELECT_BUTTON | START_BUTTON))
+                       == (A_BUTTON | B_BUTTON | SELECT_BUTTON | START_BUTTON))
+    {
+        gUnknown_020028A4 = 1;
+        gTitlescreen.unk6 = 9;
+        gMain.subState = 11;
+    }
+
+    if (!gUnknown_020028A4)
+    {
+        u16 unk4 = gTitlescreen.unk4;
+        u16 mask = 0x3;
+        if (!(unk4 & mask))
+        {
+            if (!gTitlescreen.unk2)
+            {
+                gTitlescreen.unk2 = 1;
+                sub_10708((void *)(OBJ_VRAM0 + 0x1E0 + gTitlescreen.menuCursorIndex * 0x800), gUnknown_03000000, 8, 2);
+                sub_10708((void *)(OBJ_VRAM0 + 0x61E0), (void *)(OBJ_VRAM0 + 0x1E0 + gTitlescreen.menuCursorIndex * 0x800), 8, 2);
+            }
+            else
+            {
+                gTitlescreen.unk2 = 0;
+                sub_10708(gUnknown_03000000, (void *)(OBJ_VRAM0 + 0x1E0 + gTitlescreen.menuCursorIndex * 0x800), 8, 2);
+            }
+        }
+
+        if (gTitlescreen.unk4 > 20)
+        {
+            if (gTitlescreen.menuCursorIndex == 1)
+                gMain.unkD = 1;
+            else
+                gMain.unkD = 0;
+
+            gTitlescreen.unk6 = gUnknown_086A96D4[gTitlescreen.menuCursorIndex];
+            gMain.subState = 10;
+        }
+
+        gTitlescreen.unk4++;
+    }
+
+    sub_11968();
+}
+
+void sub_11320(void)
+{
+    if ((gMain.heldKeys & (A_BUTTON | B_BUTTON | SELECT_BUTTON | START_BUTTON))
+                       == (A_BUTTON | B_BUTTON | SELECT_BUTTON | START_BUTTON))
+    {
+        gUnknown_020028A4 = 1;
+        gTitlescreen.unk6 = 9;
+        gMain.subState = 11;
+    }
+
+    if (!gUnknown_020028A4)
+    {
+        if (!gTitlescreen.unk7)
+        {
+            gTitlescreen.unk4++;
+            if (gTitlescreen.unk4 >= gUnknown_086A9748[gTitlescreen.unk2])
+            {
+                gTitlescreen.unk4 = 0;
+                if (--gTitlescreen.unk2 < 0)
+                {
+                    gTitlescreen.unk2 = 0;
+                    gTitlescreen.menuCursorIndex = 0;
+                    gUnknown_202BE24 = 1;
+                    gTitlescreen.unk9 = 1;
+                    gTitlescreen.unkB = 0;
+                    gMain.subState = 1;
+                }
+
+                gUnknown_0201C190[6] = gUnknown_086A9714[gTitlescreen.unk2];
+            }
+
+            sub_1175C();
+        }
+        else
+        {
+            gTitlescreen.unk4++;
+            if (gTitlescreen.unk4 >= gUnknown_086A9748[gTitlescreen.unk2])
+            {
+                gTitlescreen.unk4 = 0;
+                if (--gTitlescreen.unk2 < 0)
+                {
+                    gTitlescreen.unk2 = 0;
+                    gTitlescreen.menuCursorIndex = 1;
+                    gUnknown_202BE24 = 1;
+                    gTitlescreen.unk9 = 1;
+                    gTitlescreen.unkB = 0;
+                    gMain.subState = 1;
+                }
+
+                gUnknown_0202BE00[6] = gUnknown_086A9778[gTitlescreen.unk2];
+            }
+
+            sub_11968();
+        }
+    }
+}
+
+void sub_11428(void)
+{
+    if (!gTitlescreen.unk7)
+        sub_FE04(sub_1175C);
+    else
+        sub_FE04(sub_11968);
+
+    m4aMPlayAllStop();
+    sub_D10();
+
+    if (gUnknown_086A964C[gTitlescreen.unk6] == 8)
+        gUnknown_0202C588 = 0;
+    else
+        gUnknown_0202C588 = 1;
+
+    gAutoDisplayTitlescreenMenu = 0;
+    SetMainGameState(gUnknown_086A964C[gTitlescreen.unk6]);
+}
+
+void sub_114B4(void)
+{
+    sub_FE04(sub_11640);
+    m4aMPlayAllStop();
+    sub_D10();
+    gUnknown_0202C588 = 1;
+    gAutoDisplayTitlescreenMenu = 0;
+    SetMainGameState(gUnknown_086A964C[gTitlescreen.unk6]);
+}
+
+static void sub_114FC(void)
+{
+    // To delete save file, press R_BUTTON 3 times while holding L_BUTTON And DPAD_LEFT.
+    if ((gMain.heldKeys & (L_BUTTON | DPAD_LEFT)) == (L_BUTTON | DPAD_LEFT))
+    {
+        if (gMain.newKeys & R_BUTTON)
+        {
+            gUnknown_020028A1 = 40;
+            if (++gUnknown_020028A0 == 3)
+            {
+                gUnknown_020028A0 = 0;
+                gUnknown_020028A1 = 0;
+                m4aSongNumStart(0x68);
+                gTitlescreen.unk11 = 1;
+                gMain.subState = 9;
+            }
+        }
+    }
+
+    if (gUnknown_020028A1 > 0)
+    {
+        if (--gUnknown_020028A1 <= 0)
+        {
+            gUnknown_020028A1 = 0;
+            gUnknown_020028A0 = 0;
+        }
+    }
+}