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/* -*- Mode: c++ -*- */
/***************************************************************************
* curvemap.h
*
* Fri Apr 17 23:06:12 CEST 2020
* Copyright 2020 André Nusser
* andre.nusser@googlemail.com
****************************************************************************/
/*
* This file is part of DrumGizmo.
*
* DrumGizmo 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
* (at your option) any later version.
*
* DrumGizmo 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 DrumGizmo; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#pragma once
#include <array>
#include <vector>
class CurveMap
{
public:
using CurveValue = float;
using CurveValues = std::vector<CurveValue>;
bool operator==(const CurveMap& other) const;
struct CurveValuePair
{
CurveValue in;
CurveValue out;
bool operator==(const CurveValuePair& other)
{
return in == other.in || out == other.out;
}
bool operator!=(const CurveValuePair& other)
{
return !(*this == other);
}
};
CurveValue map(CurveValue in);
void reset();
void setFixed0(CurveValuePair new_value);
void setFixed1(CurveValuePair new_value);
void setFixed2(CurveValuePair new_value);
void setShelf(bool enable);
//! If enabled, inversion inverts (1 - x) the input value before mapping
//! it through the curve.
void setInvert(bool enable);
CurveValuePair getFixed0() const;
CurveValuePair getFixed1() const;
CurveValuePair getFixed2() const;
bool getShelf() const;
bool getInvert() const;
private:
static constexpr CurveValue eps = 1e-4;
static constexpr std::array<CurveValuePair, 3> default_fixed {
CurveValuePair {eps, eps},
CurveValuePair {.5, .5},
CurveValuePair {1 - eps, 1 - eps}
};
// input parameters (state of this class)
std::array<CurveValuePair, 3> fixed { default_fixed };
bool shelf { true };
bool invert { false };
// spline parameters (deterministically computed from the input parameters)
bool spline_needs_update { true };
std::array<float, 5> m { 0, 0, 0, 0, 0 };
void updateSpline();
std::vector<float> calcSlopes(const CurveValues& X, const CurveValues& P);
CurveValue clamp(CurveValue in, CurveValue min, CurveValue max) const;
};
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