Made random number generators random again.

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/trunk/supertuxkart@2632 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/utils/random_generator.cpp

@@ -20,6 +20,8 @@
 #include "random_generator.hpp"
 
 #include <stdlib.h>
+#include <algorithm>
+#include <ctime>
 
 std::vector<RandomGenerator*> RandomGenerator::m_all_random_generators;
 
@@ -29,6 +31,7 @@ RandomGenerator::RandomGenerator()
     m_c = 12345;    
     m_all_random_generators.push_back(this);
     m_random_value = 3141591;
+    std::srand((unsigned int)std::time(0));
 }   // RandomGenerator
 
 // ----------------------------------------------------------------------------
@@ -62,12 +65,20 @@ void RandomGenerator::seed(int s)
 // ----------------------------------------------------------------------------
 int RandomGenerator::get(int n)
 {
+    // This generator is (currently) not good enough, i.e. it often gives
+    // long sequences of same numbers. And the seeding is not done (the
+    // mid term goal is to synchronise all random number generators on 
+    // client and server to make less communication necessary).
+    // For now: just use standard random numbers:
+    return rand() % n;
+#ifdef NOT_USED_ATM
     m_random_value = m_random_value*m_a+m_c;
     // Note: the lower bits can have a very short cycle, e.g. for n = 4 the
     // cycle length is 4, meaning that the same sequence 1,2,3,4 is repeated
     // over and over again. The higher bits are more random, so the lower
     // 8 bits are discarded.
     return (m_random_value >> 8) % n;
+#endif
 }   // get
 
 // ----------------------------------------------------------------------------