1 files changed, 75 insertions, 11 deletions
diff --git a/src/common/random.h b/src/common/random.h
index 0b5abbcdc..acfa36166 100644
--- a/src/common/random.h
+++ b/src/common/random.h
@@ -2,8 +2,8 @@
  * This file is part of Hercules.
  * http://herc.ws - http://github.com/HerculesWS/Hercules
  *
- * Copyright (C) 2012-2015  Hercules Dev Team
- * Copyright (C)  Athena Dev Teams
+ * Copyright (C) 2012-2020 Hercules Dev Team
+ * Copyright (C) Athena Dev Teams
  *
  * Hercules is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -21,17 +21,81 @@
 #ifndef COMMON_RANDOM_H
 #define COMMON_RANDOM_H
 
-#include "common/cbasetypes.h"
+#include "common/hercules.h"
+
+/** @file
+ * The random number generator interface.
+ */
+
+/// Random interface.
+struct rnd_interface {
+	/**
+	 * Interface initialization.
+	 *
+	 * During initialization, the RNG is seeded with a random seed.
+	 */
+	void (*init) (void);
+
+	/// Interface finalization.
+	void (*final) (void);
+
+	/**
+	 * Re-seeds the random number generator.
+	 *
+	 * @param seed The new seed.
+	 */
+	void (*seed) (uint32 seed);
+
+	/**
+	 * Generates a random number in the interval [0, SINT32_MAX].
+	 */
+	int32 (*random) (void);
+
+	/**
+	 * Generates a random number in the interval [0, dice_faces).
+	 *
+	 * @remark
+	 *  interval is open ended, so dice_faces is excluded (unless it's 0)
+	 */
+	uint32 (*roll) (uint32 dice_faces);
+
+	/**
+	 * Generates a random number in the interval [min, max].
+	 *
+	 * @retval min if range is invalid.
+	 */
+	int32 (*value) (int32 min, int32 max);
+
+	/**
+	 * Generates a random number in the interval [0.0, 1.0)
+	 *
+	 * @remark
+	 *  interval is open ended, so 1.0 is excluded
+	 */
+	double (*uniform) (void);
+
+	/**
+	 * Generates a random number in the interval [0.0, 1.0) with 53-bit resolution.
+	 *
+	 * 53 bits is the maximum precision of a double.
+	 *
+	 * @remark
+	 *   interval is open ended, so 1.0 is excluded
+	 */
+	double (*uniform53) (void);
+};
+
+/**
+ * Utlity macro to call the frequently used rnd_interface#random().
+ *
+ * @related rnd_interface.
+ */
+#define rnd() rnd->random()
 
 #ifdef HERCULES_CORE
-void rnd_init(void);
-void rnd_seed(uint32);
-
-int32 rnd(void);// [0, SINT32_MAX]
-uint32 rnd_roll(uint32 dice_faces);// [0, dice_faces)
-int32 rnd_value(int32 min, int32 max);// [min, max]
-double rnd_uniform(void);// [0.0, 1.0)
-double rnd_uniform53(void);// [0.0, 1.0)
+void rnd_defaults(void);
 #endif // HERCULES_CORE
 
+HPShared struct rnd_interface *rnd; ///< Pointer to the random interface.
+
 #endif /* COMMON_RANDOM_H */