raycaster/tests/animation.cpp

#include <catch2/catch_test_macros.hpp>
#include "animation.hpp"
#include "textures.hpp"
#include "dinkyecs.hpp"
#include "config.hpp"
#include <iostream>
#include <memory>

using namespace components;
using namespace textures;

struct Sheet {
  std::string texture_name;
  int width;
  int height;
  int frame_width;
  int frame_height;
};

struct Sequence {
  size_t current_frame;
  float subframe;
  std::vector<size_t> frames;
  std::vector<float> durations;
};

struct Transform {
  // how to know when a transform ends?
    float min_x = 1.0f;
    float min_y = 1.0f;
    float max_x = 1.0f;
    float max_y = 1.0f;
    bool simple = true;
    bool flipped = false;
    float ease_rate = 0.5f;
    bool scaled = false;
    bool stationary = false;
    // these can handled by the onLoop, same as ganim8 does it
    bool toggled = false;
    bool looped = false;

    std::shared_ptr<sf::Shader> shader = nullptr;
    // change to using a callback function for these
    ease::Style easing = ease::IN_OUT_BACK;
    ease::Motion motion = ease::RUSH;
};

/* Gets the number of times it looped, and returns if it should stop. */
using OnLoopHandler = std::function<bool(int)>;

class Animate2 {
  public:
    Sheet& $sheet;
    Sequence $sequence;
    Transform $transform;
    std::shared_ptr<sf::Sprite> $sprite = nullptr;
    std::shared_ptr<sf::Texture> $texture = nullptr;

    Animate2(Sheet sheet, Sequence seq, Transform trans) :
      $sheet(sheet), $sequence(seq), $transform(trans)
    {
      auto st = textures::get_sprite($sheet.texture_name);
      $sprite = st.sprite;
      $texture = st.texture;
    }

    OnLoopHandler onLoop = nullptr;
};


/*
 * Animation is a Sheet + Sequence + Transform.
 *
 * A Sheet is just a grid of images with a predefined size for each cell. Arbitrary sized cells not supported.
 *
 * A Sequence is a list of Sheet cells _in any order_.  See https://github.com/yottahmd/ganim8-lib. Sequences have a timing element for the cells, possibly a list of durations or a single duration.
 *
 * A Transform is combinations of scale and/or position easing/motion, shader effects, and things like if it's looped or toggled.
 *
 * I like the ganim8 onLoop concept, just a callback that says what to do when the animation has looped.
 */
TEST_CASE("new animation system", "[animation-new]") {
  textures::init();

  Sheet sheet{
    .texture_name{"rat_king_boss"},
    .width{720*2},
    .height{720},
    .frame_width{720},
    .frame_height{720},
  };

  Sequence sequence{
    .current_frame{0},
    .subframe{0.0f},
    .frames{0,1},
    .durations{0.1f,0.1f},
  };

  Transform transform{
    .min_x{1.0f},
    .min_y{1.0f},
    .max_x{1.0f},
    .max_y{1.0f},
    .simple{true},
    .flipped{false},
    .ease_rate{0.5f},
    .scaled{false},
    .stationary{false},
    .toggled{false},
    .looped{false},
  };

  Animate2 anim{sheet, sequence, transform};
  anim.onLoop = [](int loop_count) -> bool {
    return loop_count < 2;
  };
}


TEST_CASE("animation easing tests", "[animation]") {
  Animation anim;

  anim.easing = ease::NONE;
  float res = anim.twitching();
  REQUIRE(res == 0.0);

  anim.easing = ease::SINE;
  anim.subframe = 1.0f;
  res = anim.twitching();
  REQUIRE(!std::isnan(res));

  anim.easing = ease::OUT_CIRC;
  res = anim.twitching();
  REQUIRE(!std::isnan(res));

  anim.easing = ease::OUT_BOUNCE;
  res = anim.twitching();
  REQUIRE(!std::isnan(res));

  anim.easing = ease::IN_OUT_BACK;
  res = anim.twitching();
  REQUIRE(!std::isnan(res));
}


TEST_CASE("animation utility API", "[animation]") {
  textures::init();
  animation::init();

  auto blanket = textures::get_sprite("ritual_crafting_area");
  auto anim = animation::load("ritual_crafting_area");

  anim.play();

  while(anim.apply(*blanket.sprite, {0,0})) {
    fmt::println("animation: {}", anim.subframe);
  }
}