init

third_party/noita_random/noita_random.cpp

@@ -0,0 +1,72 @@
+#pragma once
+
+#include <stdint.h>
+
+typedef unsigned int uint;
+typedef uint8_t byte;
+typedef int8_t int8;
+typedef int16_t int16;
+typedef int32_t int32;
+typedef int64_t int64;
+typedef uint8_t uint8;
+typedef uint16_t uint16;
+typedef uint32_t uint32;
+typedef uint64_t uint64;
+typedef uint8 bool8;
+
+uint world_seed = 0;
+
+class NollaPrng
+{
+public:
+    double Seed;
+
+    void SetRandomFromWorldSeed(uint s)
+    {
+        Seed = s;
+        if (2147483647.0 <= Seed)
+        {
+            Seed = s * 0.5;
+        }
+    }
+
+    uint NextU()
+    {
+        Next();
+        return Seed * 4.656612875e-10 * 2147483645.0;
+    }
+
+    double Next()
+    {
+        int v4 = 0x41a7 * (int)Seed - 0x7FFFFFFF * ((int)Seed / 0x1f31d);
+        if (v4 <= 0)
+        {
+            v4 += 0x7fffffff;
+        }
+        Seed = (double)v4;
+        return Seed / 0x7fffffff;
+    }
+
+    int Random(int a, int b)
+    {
+        return a + (int)((double)(b + 1 - a) * Next());
+    }
+};
+
+NollaPrng NewNollaPrng(double seed)
+{
+    NollaPrng rng;
+    rng.Seed = seed;
+    rng.Next();
+    return rng;
+}
+
+void SetWorldSeed(uint worldseed)
+{
+    world_seed = worldseed;
+}
+
+uint GetWorldSeed()
+{
+    return world_seed;
+}