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#pragma once
#include "rawaccel-base.hpp"
#include "utility.hpp"
#include <float.h>
namespace rawaccel {
/// <summary> Struct to hold "classic" (linear raised to power) acceleration implementation. </summary>
struct classic_base {
double base_fn(double x, double accel_raised, const accel_args& args) const
{
return accel_raised * pow(x - args.input_offset, args.exponent_classic) / x;
}
static double base_accel(double x, double y, const accel_args& args)
{
auto power = args.exponent_classic;
return pow(x * y * pow(x - args.input_offset, -power), 1 / (power - 1));
}
};
template <bool Gain> struct classic;
template<>
struct classic<LEGACY> : classic_base {
double accel_raised;
double cap = DBL_MAX;
double sign = 1;
classic(const accel_args& args)
{
switch (args.cap_mode) {
case cap_mode::io:
cap = args.cap.y - 1;
if (cap < 0) {
cap = -cap;
sign = -sign;
}
{
double a = base_accel(args.cap.x, cap, args);
accel_raised = pow(a, args.exponent_classic - 1);
}
break;
case cap_mode::in:
accel_raised = pow(args.acceleration, args.exponent_classic - 1);
if (args.cap.x > 0) {
cap = base_fn(args.cap.x, accel_raised, args);
}
break;
case cap_mode::out:
default:
accel_raised = pow(args.acceleration, args.exponent_classic - 1);
if (args.cap.y > 0) {
cap = args.cap.y - 1;
if (cap < 0) {
cap = -cap;
sign = -sign;
}
}
break;
}
}
double operator()(double x, const accel_args& args) const
{
if (x <= args.input_offset) return 1;
return sign * minsd(base_fn(x, accel_raised, args), cap) + 1;
}
};
template<>
struct classic<GAIN> : classic_base {
double accel_raised;
vec2d cap = { DBL_MAX, DBL_MAX };
double constant = 0;
double sign = 1;
classic(const accel_args& args)
{
switch (args.cap_mode) {
case cap_mode::io:
cap.x = args.cap.x;
cap.y = args.cap.y - 1;
if (cap.y < 0) {
cap.y = -cap.y;
sign = -sign;
}
{
double a = gain_accel(cap.x, cap.y, args.exponent_classic, args.input_offset);
accel_raised = pow(a, args.exponent_classic - 1);
}
constant = (base_fn(cap.x, accel_raised, args) - cap.y) * cap.x;
break;
case cap_mode::in:
accel_raised = pow(args.acceleration, args.exponent_classic - 1);
if (args.cap.x > 0) {
cap.x = args.cap.x;
cap.y = gain(cap.x, args.acceleration, args.exponent_classic, args.input_offset);
constant = (base_fn(cap.x, accel_raised, args) - cap.y) * cap.x;
}
break;
case cap_mode::out:
default:
accel_raised = pow(args.acceleration, args.exponent_classic - 1);
if (args.cap.y > 0) {
cap.y = args.cap.y - 1;
if (cap.y == 0) {
cap.x = 0;
}
else {
if (cap.y < 0) {
cap.y = -cap.y;
sign = -sign;
}
cap.x = gain_inverse(cap.y,
args.acceleration,
args.exponent_classic,
args.input_offset);
constant = (base_fn(cap.x, accel_raised, args) - cap.y) * cap.x;
}
}
break;
}
}
double operator()(double x, const accel_args& args) const
{
double output;
if (x <= args.input_offset) return 1;
if (x < cap.x) {
output = base_fn(x, accel_raised, args);
}
else {
output = constant / x + cap.y;
}
return sign * output + 1;
}
static double gain(double x, double accel, double power, double offset)
{
return power * pow(accel * (x - offset), power - 1);
}
static double gain_inverse(double y, double accel, double power, double offset)
{
return (accel * offset + pow(y / power, 1 / (power - 1))) / accel;
}
static double gain_accel(double x, double y, double power, double offset)
{
return -pow(y / power, 1 / (power - 1)) / (offset - x);
}
};
}
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