eis/TestProject/RNG/model/DriftModel.h

#pragma once
#include <TestProject/RNG/model/IModel.h>
#include <nlohmann/json.hpp>
using json = nlohmann::json;

struct DriftModel : IModel {
  float base, drift_rate;
  size_t period_ticks;
  DriftModel(const json& params, float defaultVal)
    : base(defaultVal), drift_rate(params.value("drift_rate", 0.0f))
    , period_ticks(params.value("period_ms", 0) / 20) {}
  float evaluate(size_t t) override {
    if (period_ticks > 0) t %= period_ticks;
    return base + drift_rate * t;
  }
};