Dungeon random/AI decomp + converted positions to structs (#83)

* Decomped RollPercentChance()

* Decomped DungeonRandomCapped()

* Decomped DungeonRandom()

* Decomped FindRockItemTargets()

-Added position struct.

1 files changed, 15 insertions, 0 deletions

diff --git a/src/dungeon_random.c b/src/dungeon_random.c
new file mode 100644
index 0000000..86b1c79
--- /dev/null
+++ b/src/dungeon_random.c
@@ -0,0 +1,15 @@
+#include "global.h"
+#include "dungeon_random.h"
+
+extern u32 gDungeonRngState;
+
+s32 DungeonRandom(void)
+{
+    gDungeonRngState = 1566083941 * gDungeonRngState + 1;
+    return gDungeonRngState >> 16;
+}
+
+s32 DungeonRandomCapped(s32 cap)
+{
+    return (((DungeonRandom() & 0xFFFF) * cap) >> 16) & 0xFFFF;
+}