/* * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc. * * This file is part of PortaPack. * * 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, 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 the file COPYING. If not, write to * the Free Software Foundation, Inc., 51 Franklin Street, * Boston, MA 02110-1301, USA. */ #ifndef __UTILITY_H__ #define __UTILITY_H__ #include <type_traits> #include <cstdint> #include <cstddef> #include <algorithm> #include <complex> #include <memory> #define LOCATE_IN_RAM __attribute__((section(".ramtext"))) inline uint16_t fb_to_uint16(const std::string& fb) { return (fb[1] << 8) + fb[0]; } inline uint32_t fb_to_uint32(const std::string& fb) { return (fb[3] << 24) + (fb[2] << 16) + (fb[1] << 8) + fb[0]; } constexpr size_t operator"" _KiB(unsigned long long v) { return v * 1024; } constexpr size_t operator"" _MiB(unsigned long long v) { return v * 1024 * 1024; } template <typename E> constexpr typename std::underlying_type<E>::type toUType(E enumerator) noexcept { /* Thanks, Scott Meyers! */ return static_cast<typename std::underlying_type<E>::type>(enumerator); } inline uint32_t flp2(uint32_t v) { v |= v >> 1; v |= v >> 2; v |= v >> 4; v |= v >> 8; v |= v >> 16; return v - (v >> 1); } uint32_t gcd(const uint32_t u, const uint32_t v); template <class T> inline constexpr T pow(const T base, unsigned const exponent) { return (exponent == 0) ? 1 : (base * pow(base, exponent - 1)); } constexpr bool power_of_two(const size_t n) { return (n & (n - 1)) == 0; } constexpr size_t log_2(const size_t n, const size_t p = 0) { return (n <= 1) ? p : log_2(n / 2, p + 1); } float fast_log2(const float val); float fast_pow2(const float val); float mag2_to_dbv_norm(const float mag2); inline float magnitude_squared(const std::complex<float> c) { const auto r = c.real(); const auto r2 = r * r; const auto i = c.imag(); const auto i2 = i * i; return r2 + i2; } int fast_int_magnitude(int y, int x); int int_atan2(int y, int x); int32_t int16_sin_s4(int32_t x); template <typename TEnum> struct is_flags_type { static constexpr bool value = false; }; template <typename TEnum> constexpr bool is_flags_type_v = is_flags_type<TEnum>::value; #define ENABLE_FLAGS_OPERATORS(type) \ template <> \ struct is_flags_type<type> { static constexpr bool value = true; }; template <typename TEnum> constexpr std::enable_if_t<is_flags_type_v<TEnum>, TEnum> operator|(TEnum a, TEnum b) { using under_t = std::underlying_type_t<TEnum>; return static_cast<TEnum>(static_cast<under_t>(a) | static_cast<under_t>(b)); } template <typename TEnum> constexpr std::enable_if_t<is_flags_type_v<TEnum>, bool> flags_enabled(TEnum value, TEnum flags) { auto i_value = static_cast<std::underlying_type_t<TEnum>>(value); auto i_flags = static_cast<std::underlying_type_t<TEnum>>(flags); return (i_value & i_flags) == i_flags; } /* Returns value constrained to min and max. */ template <class T> constexpr const T& clip(const T& value, const T& minimum, const T& maximum) { return std::max(std::min(value, maximum), minimum); } /* Saves state on construction and reverts it when destroyed. */ template <typename T> struct Stash { Stash(T& target) : target_{target}, prev_{target} { } ~Stash() { target_ = std::move(prev_); } private: T& target_; T prev_; }; // TODO: need to decide if this is inclusive or exclusive. // The implementations are different and cause the subtle // bugs mentioned below. template <class T> struct range_t { const T minimum; const T maximum; constexpr const T& clip(const T& value) const { return ::clip(value, minimum, maximum); } constexpr void reset_if_outside(T& value, const T& reset_value) const { if ((value < minimum) || (value > maximum)) { value = reset_value; } } constexpr bool below_range(const T& value) const { return value < minimum; } constexpr bool contains(const T& value) const { // TODO: Subtle gotcha here! Range test doesn't include maximum! return (value >= minimum) && (value < maximum); } constexpr bool out_of_range(const T& value) const { // TODO: Subtle gotcha here! Range test in contains() doesn't include maximum! return !contains(value); } }; #endif /*__UTILITY_H__*/