imported Löve GLES branch (changeset 1ba9037e558b)

2026-08-20 20:51:22 +02:00 · 2013-12-05 18:05:13 +01:00
parent 41b2db04a7
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+/**
+ * Copyright (c) 2006-2013 LOVE Development Team
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty.  In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software. If you use this software
+ *    in a product, an acknowledgment in the product documentation would be
+ *    appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ **/
+
+#ifndef LOVE_MATH_RANDOM_GENERATOR_H
+#define LOVE_MATH_RANDOM_GENERATOR_H
+
+// LOVE
+#include "common/config.h"
+#include "common/Exception.h"
+#include "common/math.h"
+#include "common/int.h"
+#include "common/Object.h"
+
+// STL
+#include <limits>
+
+namespace love
+{
+namespace math
+{
+
+class RandomGenerator : public Object
+{
+public:
+
+	union Seed
+	{
+		uint64 b64;
+		struct
+		{
+			uint32 a;
+			uint32 b;
+		} b32;
+	};
+
+	RandomGenerator();
+	virtual ~RandomGenerator() {}
+
+	/**
+	 * Set pseudo-random seed.
+	 * It's up to the implementation how to use this.
+	 **/
+	void setSeed(Seed seed);
+
+	/**
+	 * Separately set the low and high bits of the pseudo-random seed.
+	 **/
+	inline void setSeed(uint32 low, uint32 high)
+	{
+		Seed newseed;
+
+#ifdef LOVE_BIG_ENDIAN
+		newseed.b32.a = high;
+		newseed.b32.b = low;
+#else
+		newseed.b32.b = high;
+		newseed.b32.a = low;
+#endif
+
+		setSeed(newseed);
+	}
+
+	inline Seed getSeed() const
+	{
+		return seed;
+	}
+
+	inline void getSeed(uint32 &low, uint32 &high) const
+	{
+#ifdef LOVE_BIG_ENDIAN
+		high = seed.b32.a;
+		low = seed.b32.b;
+#else
+		high = seed.b32.b;
+		low = seed.b32.a;
+#endif
+	}
+
+	/**
+	 * Return uniformly distributed pseudo random integer.
+	 *
+	 * @return Pseudo random integer in [0,2^64).
+	 **/
+	uint64 rand();
+
+	/**
+	 * Get uniformly distributed pseudo random number in [0,1).
+	 *
+	 * @return Pseudo random number in [0,1).
+	 **/
+	inline double random()
+	{
+		return double(rand()) / (double(std::numeric_limits<uint64>::max()) + 1.0);
+	}
+
+	/**
+	 * Get uniformly distributed pseudo random number in [0,max).
+	 *
+	 * @return Pseudo random number in [0,max).
+	 **/
+	inline double random(double max)
+	{
+		return random() * max;
+	}
+
+	/**
+	 * Get uniformly distributed pseudo random number in [min, max).
+	 *
+	 * @return Pseudo random number in [min, max).
+	 **/
+	inline double random(double min, double max)
+	{
+		return random() * (max - min) + min;
+	}
+
+	/**
+	 * Get normally distributed pseudo random number.
+	 *
+	 * @param stddev Standard deviation of the distribution.
+	 * @return Normally distributed random number with mean 0 and variance (stddev)².
+	 **/
+	double randomNormal(double stddev);
+
+private:
+
+	Seed seed;
+	Seed rng_state;
+	double last_randomnormal;
+
+}; // RandomGenerator
+
+} // math
+} // love
+
+#endif // LOVE_MATH_RANDOM_GENERATOR_H