raycaster/tests/animation.cpp

#include <catch2/catch_test_macros.hpp>
#include "graphics/textures.hpp"
#include "algos/dinkyecs.hpp"
#include "game/config.hpp"
#include <iostream>
#include <memory>
#include <chrono>
#include <thread>
#include "algos/rand.hpp"
#include "graphics/animation.hpp"
#include "game/sound.hpp"
#include "game/components.hpp"

using namespace components;
using namespace textures;
using namespace std::chrono_literals;
using namespace animation;

Animation load_animation(const string& name) {
  auto anim = animation::load("assets/animation.json", "rat_king_boss");
  anim.set_form("attack");

  anim.transform.looped = false;

  for(size_t i = 0; i < anim.sequence.durations.size(); i++) {
    anim.sequence.durations[i] = Random::uniform(1, 5);
  }

  return anim;
}

void FAKE_RENDER() {
  std::this_thread::sleep_for(Random::milliseconds(5, 32));
}

void PLAY_TEST(Animation &anim) {
  REQUIRE(anim.transform.looped == false);
  anim.play();

  while(anim.playing) {
    anim.update();
    FAKE_RENDER();
  }

  REQUIRE(anim.playing == false);
}

/*
 * 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();
  sound::init();
  sound::mute(true);

  auto anim = load_animation("rat_king_boss");
  PLAY_TEST(anim);

  // test that toggled works
  anim.transform.toggled = true;
  PLAY_TEST(anim);
  REQUIRE(anim.sequence.current == anim.sequence.frames.size() - 1);
  anim.transform.toggled = false;

  bool onLoop_ran = false;
  anim.onLoop = [&](auto& seq, auto& tr) -> bool {
    seq.current = 0;
    onLoop_ran = true;
    return tr.looped;
  };

  PLAY_TEST(anim);
  REQUIRE(onLoop_ran == true);

  // only runs twice
  anim.onLoop = [](auto& seq, auto& tr) -> bool {
    if(seq.loop_count == 2) {
      seq.current = 0;
      return false;
    } else {
      seq.current = seq.current % seq.frame_count;
      return true;
    }
  };

  PLAY_TEST(anim);
  REQUIRE(anim.sequence.loop_count == 2);
}


TEST_CASE("confirm frame sequencing works", "[animation-new]") {
  textures::init();
  sound::init();
  sound::mute(true);

  auto anim = load_animation("rat_king_boss");

  auto boss = textures::get_sprite("rat_king_boss");
  sf::IntRect init_rect{{0,0}, {anim.sheet.frame_width, anim.sheet.frame_height}};

  anim.play();
  bool loop_ran = false;

  // this will check that it moved to the next frame
  anim.onLoop = [&](auto& seq, auto& tr) -> bool {
    seq.current = 0;
    loop_ran = true;
    return false;
  };

  anim.onFrame = [&](){
    anim.apply(*boss.sprite);
  };

  while(anim.playing) {
    anim.update();
    FAKE_RENDER();
  }

  REQUIRE(loop_ran == true);
  REQUIRE(anim.playing == false);
}

TEST_CASE("confirm transition changes work", "[animation-new]") {
  textures::init();
  sound::init();
  sound::mute(true);

  auto sprite = *textures::get_sprite("rat_king_boss").sprite;
  sf::Vector2f pos{100,100};
  sprite.setPosition(pos);
  auto scale = sprite.getScale();
  auto anim = load_animation("rat_king_boss");

  // also testing that onFrame being null means it's not run
  REQUIRE(anim.onFrame == nullptr);

  anim.play();
  REQUIRE(anim.playing == true);

  while(anim.playing) {
    anim.update();
    anim.motion(sprite, pos, scale);
    FAKE_RENDER();
  }

  REQUIRE(anim.playing == false);
  REQUIRE(pos == sf::Vector2f{100, 100});
  REQUIRE(scale != sf::Vector2f{0,0});
}

TEST_CASE("playing with delta time", "[animation-new]") {
  animation::Timer timer;
  timer.start();

  for(int i = 0; i < 20; i++) {
    FAKE_RENDER();
    auto [tick_count, alpha] = timer.commit();
    // fmt::println("tick: {}, alpha: {}", tick_count, alpha);
  }
}