Add custom rand function implimentation, based on precreated random sequence.

2 files changed, 75 insertions, 0 deletions

diff --git a/src/utils/mrand.cpp b/src/utils/mrand.cpp
new file mode 100644
index 000000000..85b3e6b9c
--- /dev/null
+++ b/src/utils/mrand.cpp
@@ -0,0 +1,45 @@
+/*
+ *  The ManaPlus Client
+ *  Copyright (C) 2016  The ManaPlus Developers
+ *
+ *  This file is part of The ManaPlus Client.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "utils/mrand.h"
+
+#include <cstdlib>
+
+#include "debug.h"
+
+namespace
+{
+    constexpr const int randNumbers = 1024;
+    int mPos = 0;
+    int mRand[randNumbers];
+}  // namespace
+
+void initRand()
+{
+    for (int f = 0; f < randNumbers; f ++)
+        mRand[f] = std::rand();
+}
+
+int mrand()
+{
+    if (mPos >= randNumbers)
+        mPos = 0;
+    return mRand[++mPos];
+}
diff --git a/src/utils/mrand.h b/src/utils/mrand.h
new file mode 100644
index 000000000..11a3a22a8
--- /dev/null
+++ b/src/utils/mrand.h
@@ -0,0 +1,30 @@
+/*
+ *  The ManaPlus Client
+ *  Copyright (C) 2016  The ManaPlus Developers
+ *
+ *  This file is part of The ManaPlus Client.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef UTILS_MRAND_H
+#define UTILS_MRAND_H
+
+#include "localconsts.h"
+
+void initRand();
+
+int mrand();
+
+#endif  // UTILS_MRAND_H