AnimatedPerlinTexture.cpp

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#include "AnimatedPerlinTexture.h"

AnimatedPerlinTexture::AnimatedPerlinTexture() {
  animation_step = 1.0f;
  elapsed_time = 0.0f;
  _init_textures();
}

AnimatedPerlinTexture::AnimatedPerlinTexture(double as) {
  animation_step = as;
  elapsed_time = 0.0f;
  _init_textures();
}

void AnimatedPerlinTexture::_init_textures() {
  next = new PerlinTexture();
  last = new PerlinTexture();
  curr = new PerlinTexture();
  
  next->refresh();
  last->refresh();
}

AnimatedPerlinTexture::~AnimatedPerlinTexture() {
    delete next;
    delete last;
    delete curr;
}

void AnimatedPerlinTexture::animate(double dt) {
  double p1, p2;
  if (dt <= 0)
    return;
  elapsed_time += dt;
  if (elapsed_time >= animation_step) {
    elapsed_time -= animation_step;
    delete last;
    last = next;
    next = new PerlinTexture();
    next->refresh();
  }
  p1 = animation_step - elapsed_time;
  p2 = elapsed_time;

  unsigned char* a;
  unsigned char* b;
  unsigned char* c;
  a = next->get_scaled(0,0);
  b = curr->get_scaled(0,0);
  c = last->get_scaled(0,0);
  for (int i = 0; i < PERLINTEXTURE_BASE_SQUARE; i++) {
    *b = (unsigned char) (*c) * p1 + (*a) * p2;
    ++a;
    ++b;
    ++c;
  }
}

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