*粒子系统

1 files changed, 40 insertions, 1 deletions

diff --git a/src/libjin/Math/je_random.cpp b/src/libjin/Math/je_random.cpp
index 983fa36..216fd79 100644
--- a/src/libjin/Math/je_random.cpp
+++ b/src/libjin/Math/je_random.cpp
@@ -1,3 +1,4 @@
+#include <math.h>
 #include "je_random.h"
 
 namespace JinEngine
@@ -5,9 +6,47 @@ namespace JinEngine
     namespace Math
     {
 
-        RandomGenerator::RandomGenerator()
+        RandomGenerator::RandomGenerator(uint32 seed)
+            : mSeed(seed)
         {
         }
 
+        uint32 RandomGenerator::rand()
+        {
+            unsigned int next = mSeed;
+            uint32 result;
+
+            next *= 1103515245;
+            next += 12345;
+            result = (unsigned int)(next / 65536) % 2048;
+
+            next *= 1103515245;
+            next += 12345;
+            result <<= 10;
+            result ^= (unsigned int)(next / 65536) % 1024;
+
+            next *= 1103515245;
+            next += 12345;
+            result <<= 10;
+            result ^= (unsigned int)(next / 65536) % 1024;
+
+            mSeed = next;
+
+            return result;
+        }
+
+        uint32 RandomGenerator::rand(uint32 min, uint32 max)
+        {
+            uint32 n = rand();
+            return n % (max - min + 1) + min;
+        }
+
+        float RandomGenerator::randf(float min, float max, int ac)
+        {
+            uint32 a = pow(10.f, ac);
+            uint32 n = rand(min*a, max*a);
+            return (float)n / a;
+        }
+
     }
 }
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