Added random functions which work on a supplied RNG state.

git-svn-id: svn://svn.code.sf.net/p/sc2/code/trunk@2714 8092fc87-c524-0410-9efc-e669fe64eaf9

sc2/src/sc2code/libs/math/Makeinfo

@@ -1 +1 @@
-uqm_CFILES="random.c sqrt.c"
+uqm_CFILES="random.c random2.c sqrt.c"

sc2/src/sc2code/libs/math/random.c

@@ -61,7 +61,8 @@ static DWORD seed = 12345L; /* random number seed */
 DWORD
 TFB_Random (void)
 {
-	if ((seed = A * (seed % Q) - R * (seed / Q)) > M)
+	seed = A * (seed % Q) - R * (seed / Q);
+	if (seed > M)
 		return (seed -= M);
 	else if (seed)
 		return (seed);

sc2/src/sc2code/libs/math/random.h

@@ -26,6 +26,9 @@
 * Copyright (c) 1989, Robert Leyland and Scott Anderson
 ****************************************************************************/
 
+#ifndef _RANDOM_H
+#define _RANDOM_H
+
 /* ----------------------------DEFINES------------------------------------ */
 
 #define RAND(n) ( (int) ( (unsigned int)TFB_Random() % (n) ) )
@@ -38,3 +41,22 @@
 DWORD TFB_SeedRandom (DWORD seed);
 DWORD TFB_Random (void);
 
+
+typedef struct RandomContext RandomContext;
+
+#ifdef RANDOM2_INTERNAL
+struct RandomContext {
+	DWORD seed;
+};
+#endif
+
+RandomContext *RandomContext_New (void);
+void RandomContext_Delete (RandomContext *context);
+RandomContext *RandomContext_Copy (const RandomContext *source);
+DWORD RandomContext_Random (RandomContext *context);
+DWORD RandomContext_SeedRandom (RandomContext *context, DWORD new_seed);
+
+
+#endif  /* _RANDOM_H */
+
+