Subversion Repositories DIN Is Noise

/*
* fader.cc
* DIN Is Noise is copyright (c) 2006-2020 Jagannathan Sampath
* For more information, please visit https://dinisnoise.org/
*/

#include "fader.h"
#include "console.h"
#include "chrono.h"
#include "log.h"
using namespace std;

extern const char SPC;

fader::fader (double dt) : afl (0) {
  set (0.0f, 1.0f, 0, dt);
}

fader::fader (float vs, float ve) : afl (0) {
  set (vs, ve, 0);
}

void fader::load (ifstream& f) {
  f >> start >> end >> on >> delta >> flip >> delta_time >> reached;
  start_time = ui_clk ();
}

void fader::save (ofstream& f) {
  f << start << SPC << end << SPC << on << SPC << delta << SPC << flip << SPC << delta_time << SPC << reached;
}

void fader::set (float vs, float ve, int _on, double dt) {

  start = vs;
  end = ve;
  delta = end - start;

  alpha = 0;
  amount = start;

  delta_time = dt;

  on = _on;
  reached = 0;
  start_time = ui_clk();

}

int fader::eval () {
  if (on) {
    double dt = ui_clk() - start_time;
    if (dt < delta_time) {
      alpha = dt * 1.0f / delta_time;
      amount = start + alpha * delta;
    } else {
      if (reached) {
        on = 0;
        if (afl) afl->after_fade (*this);
      } else {
        reached = 1;
        alpha = 1.0f;
        amount = end;
      }
    }
  }
  return on;
}

void fader::restart () {
  on = 1;
  reached = 0;
  alpha = 0;
  amount = start;
  start_time = ui_clk();
}

void fader::copy (fader* src) {

  if (src == 0) return;

  start = src->start;
  end = src->end;
  delta = src->delta;

  if (delta < 0) flip = 1; else flip = 0;

  alpha = src->alpha;
  amount = src->amount;

  delta_time = src->delta_time;

  on = src->on;
  reached = src->reached;
  start_time = src->start_time;

}