LMMS/include/lmms_constants.h

/*
 * lmms_constants.h - defines system constants
 *
 * Copyright (c) 2006 Danny McRae <khjklujn/at/users.sourceforge.net>
 * 
 * This file is part of LMMS - https://lmms.io
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This program 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program (see COPYING); if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA.
 *
 */

#ifndef LMMS_CONSTANTS_H
#define LMMS_CONSTANTS_H

constexpr long double LD_PI = 3.14159265358979323846264338327950288419716939937510;
constexpr long double LD_2PI = LD_PI * 2.0;
constexpr long double LD_PI_2 = LD_PI * 0.5;
constexpr long double LD_PI_R = 1.0 / LD_PI;
constexpr long double LD_PI_SQR = LD_PI * LD_PI;
constexpr long double LD_E = 2.71828182845904523536028747135266249775724709369995;
constexpr long double LD_E_R = 1.0 / LD_E;

constexpr double D_PI = (double) LD_PI;
constexpr double D_2PI = (double) LD_2PI;
constexpr double D_PI_2 = (double) LD_PI_2;
constexpr double D_PI_R = (double) LD_PI_R;
constexpr double D_PI_SQR = (double) LD_PI_SQR;
constexpr double D_E = (double) LD_E;
constexpr double D_E_R = (double) LD_E_R;

constexpr float F_PI = (float) LD_PI;
constexpr float F_2PI = (float) LD_2PI;
constexpr float F_PI_2 = (float) LD_PI_2;
constexpr float F_PI_R = (float) LD_PI_R;
constexpr float F_PI_SQR = (float) LD_PI_SQR;
constexpr float F_E = (float) LD_E;
constexpr float F_E_R = (float) LD_E_R;

// Microtuner
constexpr unsigned int MaxScaleCount = 10;  //!< number of scales per project
constexpr unsigned int MaxKeymapCount = 10; //!< number of keyboard mappings per project

// Frequency ranges (in Hz).
// Arbitrary low limit for logarithmic frequency scale; >1 Hz.
constexpr int LOWEST_LOG_FREQ = 5;

// Full range is defined by LOWEST_LOG_FREQ and current sample rate.
enum FREQUENCY_RANGES
{
	FRANGE_FULL = 0,
	FRANGE_AUDIBLE,
	FRANGE_BASS,
	FRANGE_MIDS,
	FRANGE_HIGH
};

constexpr int FRANGE_AUDIBLE_START = 20;
constexpr int FRANGE_AUDIBLE_END = 20000;
constexpr int FRANGE_BASS_START = 20;
constexpr int FRANGE_BASS_END = 300;
constexpr int FRANGE_MIDS_START = 200;
constexpr int FRANGE_MIDS_END = 5000;
constexpr int FRANGE_HIGH_START = 4000;
constexpr int FRANGE_HIGH_END = 20000;

// Amplitude ranges (in dBFS).
// Reference: full scale sine wave (-1.0 to 1.0) is 0 dB.
// Doubling or halving the amplitude produces 3 dB difference.
enum AMPLITUDE_RANGES
{
	ARANGE_EXTENDED = 0,
	ARANGE_AUDIBLE,
	ARANGE_LOUD,
	ARANGE_SILENT
};

constexpr int ARANGE_EXTENDED_START = -80;
constexpr int ARANGE_EXTENDED_END = 20;
constexpr int ARANGE_AUDIBLE_START = -50;
constexpr int ARANGE_AUDIBLE_END = 0;
constexpr int ARANGE_LOUD_START = -30;
constexpr int ARANGE_LOUD_END = 0;
constexpr int ARANGE_SILENT_START = -60;
constexpr int ARANGE_SILENT_END = -10;

#endif