finish decompiling item_use.c (#244)

* nonmatching sub_80C9720 and decompile sub_80C9838

* finish decompiling Itemfinder functions.

* decompile ItemUseOutOfBattle_PokeblockCase and ItemUseOutOfBattle_CoinCase

* rename field_doortransition

* rename weather file

* decompile more of item_use.c

* decompile up to repel code

* decompile up to stat increase code

* finish decompiling item_use.c

* remove item_use from ld_script

1 files changed, 368 insertions, 0 deletions

diff --git a/src/field_screeneffect.c b/src/field_screeneffect.c
new file mode 100644
index 000000000..6cae0c18a
--- /dev/null
+++ b/src/field_screeneffect.c
@@ -0,0 +1,368 @@
+#include "global.h"
+#include "field_screeneffect.h"
+#include "asm.h"
+#include "palette.h"
+#include "sprite.h"
+#include "task.h"
+
+struct Weather
+{
+    u8 filler_000[0x200];
+    u8 unknown_200[2][32];
+    u8 filler_240[0x480];
+    s8 unknown_6C0;
+    s8 unknown_6C1;
+    u8 unknown_6C2;
+    u8 unknown_6C3;
+    u16 unknown_6C4;
+    u8 unknown_6C6;
+    u8 unknown_6C7;
+    u8 unknown_6C8;
+    u8 unknown_6C9;
+    u8 unknown_6CA;
+    u8 unknown_6CB;
+    u8 filler_6CC[2];
+    u16 unknown_6CE;
+    u8 unknown_6D0;
+    u8 unknown_6D1;
+    u8 filler_6D2[1];
+    u8 unknown_6D3;
+    u8 unknown_6D4;
+    u8 unknown_6D5;
+    u8 filler_6D6[2];
+    u8 unknown_6D8;
+    u8 filler_6D9[1];
+    u8 unknown_6DA;
+    u8 filler_6DB[3];
+    u8 unknown_6DE;
+    u8 filler_6DF[5];
+    u8 unknown_6E4;
+    u8 filler_6E5[0x15];
+    u8 unknown_6FA;
+    u8 unknown_6FB;
+    u8 filler_6FC[4];
+    u8 unknown_700;
+    u8 filler_701[0x15];
+    u8 unknown_716;
+    u8 unknown_717;
+    u8 filler_718[0xc];
+    u8 unknown_724;
+    u8 filler_725[9];
+    u8 unknown_72E;
+};
+
+#define gWeather gUnknown_0202F7E8
+extern struct Weather gWeather;
+extern u8 *gUnknown_083970E8;
+extern u8 (*gUnknown_08396FC8[][4])(void);
+extern u8 (*gUnknown_083970B8[])(void);
+extern u8 *gUnknown_030006DC;
+extern u8 gUnknown_083970C8;
+extern u8 (*gUnknown_0202FC48)[32];
+extern u8 gUnknown_0202F9E8[32];
+
+
+void sub_807C828(void)
+{
+    u8 index;
+    if (!FuncIsActiveTask(&sub_807CA34))
+    {
+        index = AllocSpritePalette(0x1200);
+        CpuCopy32(&gUnknown_083970E8, &gPlttBufferUnfaded[0x100 + index * 16], 32);
+        sub_807CB10();
+        gWeather.unknown_6D5 = index;
+        gWeather.unknown_6D4 = AllocSpritePalette(0x1201);
+        gWeather.unknown_6DA = 0;
+        gWeather.unknown_6D8 = 0;
+        gWeather.unknown_6DE = 0;
+        gWeather.unknown_6E4 = 0;
+        gWeather.unknown_700 = 0;
+        gWeather.unknown_6FB = 0;
+        gWeather.unknown_724 = 0;
+        gWeather.unknown_716 = 0;
+        gWeather.unknown_717 = 0;
+        gWeather.unknown_72E = 0;
+        gWeather.unknown_6FA = 0;
+        sub_807DB64(16, 0);
+        gWeather.unknown_6D0 = 0;
+        gWeather.unknown_6C6 = 3;
+        gWeather.unknown_6C8 = 0;
+        gWeather.unknown_6D3 = 1;
+        gWeather.unknown_6C9 = CreateTask(&sub_807C9E4, 80);
+    }
+}
+
+void DoWeatherEffect(u8 effect)
+{
+    if (effect != 3 && effect != 5 && effect != 13)
+    {
+        PlayRainSoundEffect();
+    }
+    if (gWeather.unknown_6D1 != effect && gWeather.unknown_6D0 == effect)
+    {
+        gUnknown_08396FC8[effect][0]();
+    }
+    gWeather.unknown_6D3 = 0;
+    gWeather.unknown_6D1 = effect;
+    gWeather.unknown_6CE = 0;
+}
+
+void sub_807C988(u8 effect)
+{
+    PlayRainSoundEffect();
+    gWeather.unknown_6D0 = effect;
+    gWeather.unknown_6D1 = effect;
+}
+
+void sub_807C9B4(u8 effect)
+{
+    PlayRainSoundEffect();
+    gWeather.unknown_6D0 = effect;
+    gWeather.unknown_6D1 = effect;
+    gWeather.unknown_6C8 = 1;
+}
+
+void sub_807C9E4(u8 task)
+{
+    if (gWeather.unknown_6C8)
+    {
+        gUnknown_08396FC8[gWeather.unknown_6D0][2]();
+        gTasks[task].func = &sub_807CA34;
+    }
+}
+
+void sub_807CA34(u8 task)
+{
+    u8 v1;
+    if (gWeather.unknown_6D0 != gWeather.unknown_6D1)
+    {
+        v1 = gUnknown_08396FC8[gWeather.unknown_6D0][3]();
+        if (!v1)
+        {
+            gUnknown_08396FC8[gWeather.unknown_6D1][0]();
+            gWeather.unknown_6C3 = 0; // compiler reuses v1
+            gWeather.unknown_6C6 = 0; // compiler reuses v1
+            gWeather.unknown_6D0 = gWeather.unknown_6D1;
+            gWeather.unknown_6D3 = 1;
+        }
+    }
+    else
+    {
+        gUnknown_08396FC8[gWeather.unknown_6D0][1]();
+    }
+    gUnknown_083970B8[gWeather.unknown_6C6]();
+}
+
+void sub_807CAE8(void)
+{
+    gWeather.unknown_6C1 = 0;
+    gWeather.unknown_6C2 = 0;
+}
+
+void nullsub_38(void)
+{
+}
+
+u32 sub_807CB0C(void)
+{
+    return 0;
+}
+
+void sub_807CB10(void)
+{
+    u16 v0;
+    u8(*v1)[32];
+    u16 v2;
+    u16 v4;
+    u16 v5;
+    u16 v6;
+    u16 v9;
+    u32 v10;
+    u16 v11;
+    s16 dunno;
+
+    gUnknown_030006DC = &gUnknown_083970C8;
+    for (v0 = 0; v0 <= 1; v0++)
+    {
+        if (v0 == 0)
+        {
+            v1 = &gUnknown_0202F9E8;
+        }
+        else
+        {
+            v1 = &gUnknown_0202F9E8 + 19;
+        }
+        for (v2 = 0; (u16)v2 <= 0x1f; v2++)
+        {
+            v4 = v2 << 8;
+            if (v0 == 0)
+            {
+                v5 = (v2 << 8) / 16;
+            }
+            else
+            {
+                v5 = 0;
+            }
+            v6 = 0;
+            for (; v6 <= 2; v6++)
+            {
+                v4 = (v4 - v5);
+                v1[v6][v2] = v4 >> 8;
+            }
+            v9 = v4;
+            v10 = 0x1f00 - v4;
+            if ((0x1f00 - v4) < 0)
+            {
+                v10 += 0xf;
+            }
+            v11 = v10 >> 4;
+            if (v2 <= 0xb)
+            {
+                for (; v6 <= 0x12; v6++)
+                {
+                    v4 += v11;
+                    dunno = v4 - v9;
+                    if (dunno > 0)
+                    {
+                        v4 -= (dunno + ((u16)dunno >> 15)) >> 1;
+                    }
+                    v1[v6][v2] = v4 >> 8;
+                    if (v1[v6][v2] > 0x1f)
+                    {
+                        v1[v6][v2] = 0x1f;
+                    }
+                }
+            }
+            else
+            {
+                for (; v6 <= 0x12; v6++)
+                {
+                    v4 += v11;
+                    v1[v6][v2] = v4 >> 8;
+                    if (v1[v6][v2] > 0x1f)
+                    {
+                        v1[v6][v2] = 0x1f;
+                    }
+                }
+            }
+        }
+    }
+}
+
+void sub_807CC24(void)
+{
+    if (gWeather.unknown_6C0 == gWeather.unknown_6C1)
+    {
+        gWeather.unknown_6C6 = 3;
+    }
+    else
+    {
+        if (++gWeather.unknown_6C3 >= gWeather.unknown_6C2)
+        {
+            gWeather.unknown_6C3 = 0;
+            if (gWeather.unknown_6C0 < gWeather.unknown_6C1)
+            {
+                gWeather.unknown_6C0++;
+            }
+            else
+            {
+                gWeather.unknown_6C0--;
+            }
+            sub_807CEBC(0, 0x20, gWeather.unknown_6C0);
+        }
+    }
+}
+
+void sub_807CCAC(void)
+{
+    if (++gWeather.unknown_6CB > 1)
+    {
+        gWeather.unknown_6CA = 0;
+    }
+    switch (gWeather.unknown_6D0)
+    {
+    case 3:
+    case 4:
+    case 5:
+    case 11:
+    case 13:
+        if (sub_807CDC4() == 0)
+        {
+            gWeather.unknown_6C0 = 3;
+            gWeather.unknown_6C6 = 3;
+        }
+        break;
+    case 12:
+        if (sub_807CE24() == 0)
+        {
+            gWeather.unknown_6C0 = -6;
+            gWeather.unknown_6C6 = 3;
+        }
+        break;
+    case 6:
+        if (sub_807CE7C() == 0)
+        {
+            gWeather.unknown_6C0 = 0;
+            gWeather.unknown_6C6 = 3;
+        }
+        break;
+    case 7:
+    case 8:
+    case 9:
+    case 10:
+    default:
+        if (!gPaletteFade.active)
+        {
+            gWeather.unknown_6C0 = gWeather.unknown_6C1;
+            gWeather.unknown_6C6 = 3;
+        }
+        break;
+    }
+}
+
+u8 sub_807CDC4(void)
+{
+    if (gWeather.unknown_6C7 == 0x10)
+    {
+        return 0;
+    }
+    if (++gWeather.unknown_6C7 >= 0x10)
+    {
+        sub_807CEBC(0, 0x20, 3);
+        gWeather.unknown_6C7 = 0x10;
+        return 0;
+    }
+    sub_807D1BC(0, 0x20, 3, 0x10 - gWeather.unknown_6C7, gWeather.unknown_6C4);
+    return 1;
+}
+
+u8 sub_807CE24(void)
+{
+    if (gWeather.unknown_6C7 == 0x10)
+    {
+        return 0;
+    }
+    if (++gWeather.unknown_6C7 >= 0x10)
+    {
+        sub_807CEBC(0, 0x20, -6);
+        gWeather.unknown_6C7 = 0x10;
+        return 0;
+    }
+    sub_807D304(-6, 0x10 - gWeather.unknown_6C7, gWeather.unknown_6C4);
+    return 1;
+}
+
+u8 sub_807CE7C(void)
+{
+    if (gWeather.unknown_6C7 == 0x10)
+    {
+        return 0;
+    }
+    ++gWeather.unknown_6C7;
+    sub_807D424(0x10 - gWeather.unknown_6C7, gWeather.unknown_6C4);
+    return 1;
+}
+
+void nullsub_39(void)
+{
+}