From 966fe28c59f59fc8be795c8215b9352435982445 Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Thu, 30 Sep 2021 16:46:36 +0200
Subject: Merged nGenEx and Parser into Stars45

---
 Stars45/Random.cpp | 172 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 172 insertions(+)
 create mode 100644 Stars45/Random.cpp

(limited to 'Stars45/Random.cpp')

diff --git a/Stars45/Random.cpp b/Stars45/Random.cpp
new file mode 100644
index 0000000..57752e9
--- /dev/null
+++ b/Stars45/Random.cpp
@@ -0,0 +1,172 @@
+/*  Starshatter OpenSource Distribution
+    Copyright (c) 1997-2004, Destroyer Studios LLC.
+    All Rights Reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright notice,
+      this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright notice,
+      this list of conditions and the following disclaimer in the documentation
+      and/or other materials provided with the distribution.
+    * Neither the name "Destroyer Studios" nor the names of its contributors
+      may be used to endorse or promote products derived from this software
+      without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+    ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+    POSSIBILITY OF SUCH DAMAGE.
+
+    SUBSYSTEM:    nGenEx.lib
+    FILE:         Random.cpp
+    AUTHOR:       John DiCamillo
+
+
+    OVERVIEW
+    ========
+    Utility functions for generating random numbers and locations.
+*/
+
+#include "MemDebug.h"
+#include "Random.h"
+
+// +----------------------------------------------------------------------+
+
+void RandomInit()
+{
+    srand(timeGetTime());
+}
+
+// +----------------------------------------------------------------------+
+
+Point RandomDirection()
+{
+    Point p = Point(rand() - 16384, rand() - 16384, 0);
+    p.Normalize();
+    return p;
+}
+
+// +----------------------------------------------------------------------+
+
+Point RandomPoint()
+{
+    Point p = Point(rand() - 16384, rand() - 16384, 0);
+    p.Normalize();
+    p *= 15e3 + rand()/3;
+    return p;
+}
+
+// +----------------------------------------------------------------------+
+
+Vec3 RandomVector(double radius)
+{
+    Vec3 v = Vec3(rand() - 16384, rand() - 16384, rand() - 16384);
+    v.Normalize();
+
+    if (radius > 0)
+    v *= (float) radius;
+    else
+    v *= (float) Random(radius/3, radius);
+
+    return v;
+}
+
+// +----------------------------------------------------------------------+
+
+double Random(double min, double max)
+{
+    double delta = max - min;
+    double r     = delta * rand() / 32768.0;
+
+    return min + r;
+}
+
+// +----------------------------------------------------------------------+
+
+int RandomIndex()
+{
+    static int index     = 0;
+    static int table[16] = { 0, 9, 4, 7, 14, 11, 2, 12, 1, 5, 13, 8, 6, 10, 3, 15 };
+
+    int r = 1 + ((rand() & 0x0700) >> 8);
+    index += r;
+    if (index > 1e7) index = 0;
+    return table[index % 16];
+}
+
+// +----------------------------------------------------------------------+
+
+bool RandomChance(int wins, int tries)
+{
+    double fraction = 256.0 * wins / tries;
+    double r        = (rand() >> 4) & 0xFF;
+
+    return r < fraction;
+}
+
+// +----------------------------------------------------------------------+
+
+int RandomSequence(int current, int range)
+{
+    if (range > 1) {
+        int step = (int) Random(1, range-1);
+        return (current + step) % range;
+    }
+
+    return current;
+}
+
+// +----------------------------------------------------------------------+
+
+int RandomShuffle(int count)
+{
+    static int  set_size = -1;
+    static BYTE set[256];
+    static int  index    = -1;
+
+    if (count < 0 || count > 250)
+    return 0;
+
+    if (set_size != count) {
+        set_size = count;
+        index    = -1;
+    }
+
+    // need to reshuffle
+    if (index < 0 || index > set_size-1) {
+        // set up the deck
+        int tmp[256];
+        for (int i = 0; i < 256; i++)
+        tmp[i] = i;
+
+        // shuffle the cards
+        for (int i = 0; i < set_size; i++) {
+            int n     = (int) Random(0, set_size);
+            int tries = set_size;
+            while (tmp[n] < 0 && tries--) {
+                n = (n+1) % set_size;
+            }
+
+            if (tmp[n] >= 0) {
+                set[i] = tmp[n];
+                tmp[n] = -1;
+            }
+            else {
+                set[i] = 0;
+            }
+        }
+
+        index = 0;
+    }
+
+    return set[index++];
+}
-- 
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