help_system: sub_813B870

1 files changed, 124 insertions, 0 deletions

diff --git a/src/help_system.c b/src/help_system.c
index 522890780..e7c29a39d 100644
--- a/src/help_system.c
+++ b/src/help_system.c
@@ -1,7 +1,14 @@
 #include "global.h"
+#include "decompress.h"
+#include "gpu_regs.h"
 #include "main.h"
+#include "m4a.h"
+#include "dma3.h"
 #include "help_system.h"
 #include "list_menu.h"
+#include "sound.h"
+#include "strings.h"
+#include "constants/songs.h"
 
 struct HelpSystemVideoState
 {
@@ -16,6 +23,21 @@ struct HelpSystemVideoState
     /*0x15*/ u8 state;
 };
 
+void sub_813BB38(void);
+void sub_813BB74(void);
+void sub_813BBAC(void);
+void sub_813BBC8(void);
+void sub_813BBDC(void);
+void sub_813BCF4(void);
+void sub_813BBF4(void);
+void sub_813BD14(u8);
+void sub_813BF50(u8);
+void sub_813BC2C(void);
+void sub_813BC48(void);
+void sub_813BC5C(void);
+void sub_813C454(const u8 * str);
+void sub_813C5D4(void);
+
 EWRAM_DATA u8 gUnknown_203B174[0x4000] = {0};
 EWRAM_DATA u8 gUnknown_203F174 = 0;
 EWRAM_DATA u8 gUnknown_203F175 = 0;
@@ -24,3 +46,105 @@ EWRAM_DATA u8 gUnknown_203F177 = 0;
 EWRAM_DATA struct HelpSystemVideoState gUnknown_203F178 = {0};
 EWRAM_DATA struct HelpSystemStruct_203F190 gUnknown_203F190 = {0};
 EWRAM_DATA struct ListMenuItem gUnknown_203F1AC[52] = {0};
+
+const u16 gUnknown_8464008[] = INCBIN_U16("graphics/help_system/unk_8464008.4bpp");
+const u16 gUnknown_8464128[] = INCBIN_U16("graphics/help_system/unk_8464008.gbapal");
+
+u8 sub_813B870(void)
+{
+    s32 i;
+
+    switch (gUnknown_203F178.state)
+    {
+    case 0:
+        gUnknown_203F177 = 0;
+        if (gSaveBlock2Ptr->optionsButtonMode != OPTIONS_BUTTON_MODE_NORMAL)
+            return 0;
+        if (JOY_NEW(R_BUTTON) && gUnknown_203F175 == 1)
+            return 0;
+        if (JOY_NEW(L_BUTTON | R_BUTTON))
+        {
+            if (!sub_812B45C() || !gUnknown_3005ECC)
+            {
+                PlaySE(SE_HELP_PAGE);
+                return 0;
+            }
+            m4aMPlayStop(&gMPlayInfo_SE1);
+            m4aMPlayStop(&gMPlayInfo_SE2);
+            PlaySE(SE_HELP_OPEN);
+            if (!gUnknown_203F174)
+                m4aMPlayVolumeControl(&gMPlayInfo_BGM, 0xFFFF, 0x80);
+            sub_813BB38();
+            gUnknown_203F177 = 1;
+            gUnknown_203F178.state = 1;
+        }
+        break;
+    case 1:
+        sub_813BBAC();
+        sub_813BB74();
+        sub_813BBC8();
+        (*(vu16 *)PLTT) = gUnknown_8464128[15];
+        SetGpuReg(REG_OFFSET_DISPCNT, 0);
+        gUnknown_203F178.state = 2;
+        break;
+    case 2:
+        RequestDma3Fill(0, (void *)BG_CHAR_ADDR(3), BG_CHAR_SIZE, 0);
+        RequestDma3Copy(gUnknown_8464128, (void *)PLTT, sizeof(gUnknown_8464128), 0);
+        RequestDma3Copy(gUnknown_8464008, gDecompressionBuffer + 0x3EE0, sizeof(gUnknown_8464008), 0);
+        gUnknown_203F178.state = 3;
+        break;
+    case 3:
+        sub_813BCF4();
+        sub_813C5D4();
+        sub_813C5FC();
+        sub_813C454(gUnknown_841CB49);
+        sub_813BD14(1);
+        if (sub_812B40C() == TRUE)
+            sub_812BC54(&gUnknown_203F190, gUnknown_203F1AC);
+        else
+            sub_812BCA8(&gUnknown_203F190, gUnknown_203F1AC);
+        sub_813BE78(1);
+        sub_813BF50(1);
+        sub_813BC5C();
+        gUnknown_203F178.state = 4;
+        break;
+    case 4:
+        SetGpuReg(REG_OFFSET_BLDCNT, 0);
+        SetGpuReg(REG_OFFSET_BG0HOFS, 0);
+        SetGpuReg(REG_OFFSET_BG0VOFS, 0);
+        SetGpuReg(REG_OFFSET_BG0CNT, BGCNT_PRIORITY(0) | BGCNT_CHARBASE(3) | BGCNT_16COLOR | BGCNT_SCREENBASE(31));
+        SetGpuReg(REG_OFFSET_DISPCNT, DISPCNT_BG0_ON);
+        gUnknown_203F178.state = 5;
+        break;
+    case 5:
+        if (!sub_812BB9C(&gUnknown_203F190, gUnknown_203F1AC))
+        {
+            PlaySE(SE_HELP_CLOSE);
+            gUnknown_203F178.state = 6;
+        }
+        break;
+    case 6:
+        SetGpuReg(REG_OFFSET_DISPCNT, 0);
+        sub_813BC2C();
+        for (i = 0; i < 0x200; i += 2)
+        {
+            *((vu16 *)(PLTT + 0x000 + i)) = gUnknown_8464128[15];
+            *((vu16 *)(PLTT + 0x200 + i)) = gUnknown_8464128[15];
+        }
+        gUnknown_203F178.state = 7;
+        break;
+    case 7:
+        if (!gUnknown_203F174)
+            m4aMPlayVolumeControl(&gMPlayInfo_BGM, 0xFFFF, 0x100);
+        sub_813BC48();
+        sub_813BBF4();
+        gUnknown_203F178.state = 8;
+        break;
+    case 8:
+        sub_813BBDC();
+        gUnknown_203F177 = 0;
+        gUnknown_203F178.state = 0;
+        break;
+    }
+    return gUnknown_203F178.state;
+}