Decompile RBO3 Functions

Decompiles `func_us_80191438`, `func_us_8019179C`, and
`func_us_80192B38`.

Imports `func_us_80192020` and `func_us_80192998` from Xeeynamo#557.

config/symbols.us.borbo3.txt

@@ -7,6 +7,7 @@ g_eBreakableDrawModes = 0x801805E0;
 func_801A7D64 = 0x80191080;
 EntityUnkId12 = 0x80191148;
 EntityBreakable = 0x80191304;
+EntityMedusa = 0x8019179C;
 Random = 0x80193198;
 Update = 0x801931C8;
 UpdateStageEntities = 0x801934C4;

include/entity.h

@@ -696,6 +696,13 @@ typedef struct {
  /* 0x80 */ s32 unk80;
 } ET_RoomTransition2;
 
+typedef struct {
+ /* 0x7C */ char pad_7C[0x4];
+ /* 0x80 */ u8* anim;
+ /* 0x84 */ char pad_84[0x8];
+ /* 0x8C */ s32 accelY;
+} ET_80192998;
+
 typedef struct {
  /* 0x7C */ u8 pad0[0x4];
  /* 0x80 */ u8* anim;
@@ -1922,6 +1929,7 @@ typedef union { // offset=0x7C
  ET_Succubus succubus;
  ET_StageTitleCard stageTitleCard;
  ET_RoomTransition2 roomTransition2;
+ ET_80192998 e_80192998;
  ET_WargExplosionPuffOpaque wargpuff;
  ET_FireWarg fireWarg;
  ET_FireWargHelper fireWargHelper;

include/sfx.h

@@ -270,6 +270,18 @@ enum SfxModes {
 #define SE_TREE_BRANCH_SNAP 0x7A4
 #define SE_CASTLE_GATE_RISE 0x7A5
 
+// BOSS RBO3 - Medusa
+#define SFX_RBO3_UNK_7C5 0x7C5
+#define SFX_RBO3_UNK_7C8 0x7C8
+#define SFX_RBO3_UNK_7D1 0x7D1
+#define SFX_RBO3_UNK_7FB 0x7FB
+#define SFX_RBO3_UNK_7FD 0x7FD
+#define SFX_RBO3_UNK_7FE 0x7FE
+#define SFX_RBO3_UNK_7FF 0x7FF
+#define SFX_RBO3_UNK_801 0x801
+#define SFX_RBO3_UNK_802 0x802
+#define SFX_RBO3_UNK_804 0x804
+
 // SHARED SOUNDS
 // These are sounds that are shared across multiple BIN files
 #define SE_BOSS_DEFEATED 0x7D2