57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
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#ifndef _DERANDOM_H
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#define _DERANDOM_H
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/*-------------------------------------------------------------------------
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* drawElements Base Portability Library
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* -------------------------------------
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*
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* Copyright 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*//*!
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* \file
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* \brief Random number generation.
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*//*--------------------------------------------------------------------*/
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#include "deDefs.h"
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DE_BEGIN_EXTERN_C
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/*--------------------------------------------------------------------*//*!
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* \brief Random number generator.
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*
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* Uses the Xorshift algorithm for producing pseudo-random numbers. The
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* values are generated based on an initial seed and the same seed always
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* produces the same sequence of numbers.
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*
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* See: http://en.wikipedia.org/wiki/Xorshift
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*//*--------------------------------------------------------------------*/
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typedef struct deRandom_s
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{
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deUint32 x; /*!< Current random state. */
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deUint32 y;
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deUint32 z;
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deUint32 w;
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} deRandom;
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void deRandom_init (deRandom* rnd, deUint32 seed);
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deUint32 deRandom_getUint32 (deRandom* rnd);
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deUint64 deRandom_getUint64 (deRandom* rnd);
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float deRandom_getFloat (deRandom* rnd);
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double deRandom_getDouble (deRandom* rnd);
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deBool deRandom_getBool (deRandom* rnd);
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DE_END_EXTERN_C
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#endif /* _DERANDOM_H */
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