xref: /third_party/vk-gl-cts/framework/delibs/debase/deRandom.h

#ifndef _DERANDOM_H
#define _DERANDOM_H
/*-------------------------------------------------------------------------
 * drawElements Base Portability Library
 * -------------------------------------
 *
 * Copyright 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 *//*!
 * \file
 * \brief Random number generation.
 *//*--------------------------------------------------------------------*/

#include "deDefs.h"

DE_BEGIN_EXTERN_C

/*--------------------------------------------------------------------*//*!
 * \brief Random number generator.
 *
 * Uses the Xorshift algorithm for producing pseudo-random numbers. The
 * values are generated based on an initial seed and the same seed always
 * produces the same sequence of numbers.
 *
 * See: http://en.wikipedia.org/wiki/Xorshift
 *//*--------------------------------------------------------------------*/
typedef struct deRandom_s
{
	deUint32	x;		/*!< Current random state.		*/
	deUint32	y;
	deUint32	z;
	deUint32	w;
} deRandom;

void		deRandom_init			(deRandom* rnd, deUint32 seed);
deUint32	deRandom_getUint32		(deRandom* rnd);
deUint64	deRandom_getUint64		(deRandom* rnd);
float		deRandom_getFloat		(deRandom* rnd);
double		deRandom_getDouble		(deRandom* rnd);
deBool		deRandom_getBool		(deRandom* rnd);

DE_END_EXTERN_C

#endif /* _DERANDOM_H */