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/*
* Copyright (C) 2020 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2020 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-dsp-units
* Created on: 23 марта 2016 г.
*
* lsp-dsp-units is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* lsp-dsp-units is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with lsp-dsp-units. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef LSP_PLUG_IN_DSP_UNITS_UTIL_RANDOMIZER_H_
#define LSP_PLUG_IN_DSP_UNITS_UTIL_RANDOMIZER_H_
#include <lsp-plug.in/dsp-units/version.h>
#include <lsp-plug.in/dsp-units/iface/IStateDumper.h>
namespace lsp
{
namespace dspu
{
enum random_function_t
{
RND_LINEAR, // Uniform over [0, 1)
RND_EXP, // Decaying exponential over [0, 1]
RND_TRIANGLE, // Triangle over [0, 1]
RND_GAUSSIAN, // Gaussian of mean 0 and standard deviation 1 (has negative values)
RND_MAX
};
class LSP_DSP_UNITS_PUBLIC Randomizer
{
private:
Randomizer &operator = (const Randomizer &);
Randomizer(const Randomizer &);
private:
static const uint32_t vMul1[];
static const uint32_t vMul2[];
static const uint32_t vAdders[];
typedef struct randgen_t
{
uint32_t vLast;
uint32_t vMul1;
uint32_t vMul2;
uint32_t vAdd;
} randgen_t;
randgen_t vRandom[4];
size_t nBufID;
protected:
float generate_linear();
public:
explicit Randomizer();
~Randomizer();
/**
* Construct the randomizer
*/
void construct();
/**
* Destroy the randomizer
*/
void destroy();
/** Initialize random generator
*
* @param seed seed
*/
void init(uint32_t seed);
/** Initialize random generator, take current time as seed
*/
void init();
public:
/** Generate float random number in range of [0..1) - excluding 1.0f
* The guaranteed tolerance is 1e-6 or 0.000001
*
* @param func function
* @return random number
*/
float random(random_function_t func = RND_LINEAR);
/**
* Dump the state
* @param dumper dumper
*/
void dump(IStateDumper *v) const;
};
}
} /* namespace lsp */
#endif /* LSP_PLUG_IN_DSP_UNITS_UTIL_RANDOMIZER_H_ */
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