Add LocalRandomSeed (#4278)

include/random.h

@@ -17,6 +17,7 @@
 * LocalRandom(*val) allows you to have local random states that are the same
 * type as the global states regardless of HQ_RANDOM setting, which is useful
 * if you want to be able to set them from or assign them to gRngValue.
+* LocalRandomSeed(u32) returns a properly seeded rng_value_t.
 *
 * Random2_32() was added to HQ_RANDOM because the output of the generator is
 * always 32 bits and Random()/Random2() are just wrappers in that mode. It is
@@ -61,6 +62,7 @@ static inline u16 Random(void)
 
 void SeedRng(u32 seed);
 void SeedRng2(u32 seed);
+rng_value_t LocalRandomSeed(u32 seed);
 
 static inline u16 Random2(void)
 {
@@ -96,6 +98,11 @@ static inline void AdvanceRandom(void)
     Random();
 }
 
+static inline rng_value_t LocalRandomSeed(u32 seed)
+{
+    return seed;
+}
+
 #endif
 
 extern rng_value_t gRngValue;

src/random.c

@@ -91,6 +91,13 @@ void SeedRng2(u32 seed)
     SFC32_Seed(&gRng2Value, seed, STREAM2);
 }
 
+rng_value_t LocalRandomSeed(u32 seed)
+{
+    rng_value_t result;
+    SFC32_Seed(&result, seed, STREAM1);
+    return result;
+}
+
 void AdvanceRandom(void)
 {
     if (sRngLoopUnlocked == TRUE)