added fast pseudo-random integer generator

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@319 0778d3d1-df1d-0410-868b-ea421aaaa00d

include/lmms_math.h

@@ -27,6 +27,8 @@
 #define _LMMS_MATH_H
 
 
+
+
 // Equivalent to _x - floorf( _x )
 static inline float fraction( const float _x )
 {
@@ -35,4 +37,17 @@ static inline float fraction( const float _x )
 }
 
 
+
+
+#define FAST_RAND_MAX 32767
+static inline int fast_rand( void )
+{
+	static unsigned long next = 1;
+	next = next * 1103515245 + 12345;
+	return( (unsigned)( next / 65536 ) % 32768 );
+}
+
+
+
+
 #endif