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-rw-r--r--src/noise.h39
1 files changed, 39 insertions, 0 deletions
diff --git a/src/noise.h b/src/noise.h
index 6e4fedbc4..c8d8985c6 100644
--- a/src/noise.h
+++ b/src/noise.h
@@ -20,6 +20,45 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#ifndef NOISE_HEADER
#define NOISE_HEADER
+#include "debug.h"
+
+class PseudoRandom
+{
+public:
+ PseudoRandom(): m_next(0)
+ {
+ }
+ PseudoRandom(int seed): m_next(seed)
+ {
+ }
+ void seed(int seed)
+ {
+ m_next = seed;
+ }
+ // Returns 0...32767
+ int next()
+ {
+ m_next = m_next * 1103515245 + 12345;
+ return((unsigned)(m_next/65536) % 32768);
+ }
+ int range(int min, int max)
+ {
+ if(max-min > 32768/10)
+ {
+ //dstream<<"WARNING: PseudoRandom::range: max > 32767"<<std::endl;
+ assert(0);
+ }
+ if(min > max)
+ {
+ assert(0);
+ return max;
+ }
+ return (next()%(max-min+1))+min;
+ }
+private:
+ int m_next;
+};
+
double easeCurve(double t);
// Return value: -1 ... 1