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#pragma once
#include "rawaccel-base.hpp"
namespace rawaccel {
/// <summary> Struct to hold "natural" (vanishing difference) acceleration implementation. </summary>
struct natural_base {
double offset;
double accel;
double limit;
natural_base(const accel_args& args) :
offset(args.input_offset),
limit(args.limit - 1)
{
accel = args.decay_rate / fabs(limit);
}
};
template<bool Gain> struct natural;
template<>
struct natural<LEGACY> : natural_base {
double operator()(double x, const accel_args&) const
{
if (x <= offset) return 1;
double offset_x = offset - x;
double decay = exp(accel * offset_x);
return limit * (1 - (offset - decay * offset_x) / x) + 1;
}
using natural_base::natural_base;
};
template<>
struct natural<GAIN> : natural_base {
double constant;
double operator()(double x, const accel_args&) const
{
if (x <= offset) return 1;
double offset_x = offset - x;
double decay = exp(accel * offset_x);
double output = limit * (decay / accel - offset_x) + constant;
return output / x + 1;
}
natural(const accel_args& args) :
natural_base(args),
constant(-limit / accel) {}
};
}
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