fxpt

Library for doing arithmetic with fixed point numbers and converting them from/to floating point numbers.

Types

std::fxpt::fixed

A fixed point value

using fixed = s128;

Functions

std::fxpt::to_float

Converts a fixed point value into a floating point value

• fxt: The fixed point value to convert

• precision: The bits of precision the new value should have

• return: The floating point representation of fxt

fn to_float(std::fxpt::fixed fxt, u32 precision);

std::fxpt::to_fixed

Converts a floating point value into a fixed point value

• flt: The floating point value to convert

• precision: The bits of precision the new value should have

• return: The fixed point representation of flt

fn to_fixed(double flt, u32 precision);

std::fxpt::change_precision

Changes the number of bits used to represent the decimal part of the given fixed point number

• value: The fixed point value to convert

• start_precision: The current number of bits used

• end_precision: The new number of bits used

• return: value as a new fixed point number with end_precision bits of precision

fn change_precision(std::fxpt::fixed value, u32 start_precision, u32 end_precision);

std::fxpt::add

Adds two fixed point numbers with a given precision together

• a: First fixed point number

• b: Second fixed point number

• precision: The precision of a and b

• return: Result of the addition of a and b

fn add(std::fxpt::fixed a, std::fxpt::fixed b, u32 precision);

std::fxpt::subtract

Subtracts two fixed point numbers with a given precision together

• a: First fixed point number

• b: Second fixed point number

• precision: The precision of a and b

• return: Result of the subtraction of a and b

fn subtract(std::fxpt::fixed a, std::fxpt::fixed b, u32 precision);

std::fxpt::multiply

Multiplies two fixed point numbers with a given precision together

• a: First fixed point number

• b: Second fixed point number

• precision: The precision of a and b

• return: Result of the multiplication of a and b

fn multiply(std::fxpt::fixed a, std::fxpt::fixed b, u32 precision);

std::fxpt::divide

Divides two fixed point numbers with a given precision together

• a: First fixed point number

• b: Second fixed point number

• precision: The precision of a and b

• return: Result of the division of a and b

fn divide(std::fxpt::fixed a, std::fxpt::fixed b, u32 precision);