cpp-danmaku/src/level.cxx

//
//  level.cxx
//  danmaku
//
//  Created by Sam Jaffe on 5/26/19.
//  Copyright © 2019 Sam Jaffe. All rights reserved.
//

#include "danmaku/level.hpp"

#include <json/json.h>

#include "danmaku/actor.hpp"
#include "danmaku/bullet.hpp"
#include "danmaku/player.hpp"
#include "danmaku/serial.hpp"
#include "game/graphics/renderer.hpp"
#include "game/math/common.hpp"
#include "game/util/env.hpp"
#include "resource_factory/prototype_factory.hpp"

using namespace danmaku;

struct wave_helper {
  using wave_t = std::vector<std::unique_ptr<actor>>;

  wave_t get_wave(Json::Value const & json) {
    wave_t out;
    for (int i = 0; i < json.size(); ++i) {
      std::string file = mappings[json[i]["id"].asString()].asString();
      std::string path = env::resource_file("scripts/entity/" + file);
      Json::Value actor = engine::read_file(path);
      actor["position"] = json[i]["position"];
      out.emplace_back(to_actor(actor, manager));
    }
    return out;
  }

  std::deque<wave_t> operator()() {
    std::deque<wave_t> out;
    for (int i = 0; i < waves.size(); ++i) {
      out.emplace_back(get_wave(waves[i]));
    }
    return out;
  }

  wave_helper(Json::Value const & json, graphics::manager const & mgr)
      : waves(json["waves"]), mappings(json["mappings"]), manager(mgr) {}

  Json::Value const & waves;
  Json::Value const & mappings;
  graphics::manager const & manager;
};

level::level(Json::Value const & json,
             std::shared_ptr<engine::game_dispatch> dispatch)
    : engine::scene(json["id"].asString(), dispatch),
      player_(), wave_timer_{json["timeBetweenWaves"].asFloat()},
      waves_(wave_helper{json, graphics_manager()}()) {}

level::level(std::string const & id, Json::Value const & json,
             std::shared_ptr<engine::game_dispatch> dispatch)
    : engine::scene(id, dispatch),
      player_(), wave_timer_{json["timeBetweenWaves"].asFloat()},
      waves_(wave_helper{json, graphics_manager()}()) {}

level::~level() {}

void level::add_bullet(bullet b) {
  bullets_.emplace_back(std::make_unique<bullet>(std::move(b)));
  // TODO: Add to correct collision boxes...
  collidables[0].emplace_back(bullets_.back().get());
}

template <typename T>
void level::perform_oob_culling_impl(std::vector<std::unique_ptr<T>> & data) {
  // TODO: Aquire screen size correctly...?
  math::dim2::rectangle bound{{{0.f, 0.f}}, {{3840.f, 2160.f}}};
  auto is_oob = [&bound](std::unique_ptr<T> & ptr) {
    return !math::intersects(ptr->render_info().points, bound);
  };
  auto it = std::remove_if(data.begin(), data.end(), is_oob);
  auto remove_collider = [this](std::unique_ptr<T> & ptr) {
    // TODO: colliders, use the collision enums.
    collidables[0].erase(
        std::remove(collidables[0].begin(), collidables[0].end(), ptr.get()),
        collidables[0].end());
  };
  std::for_each(it, data.end(), remove_collider);
  data.erase(it, data.end());
}

void level::perform_oob_culling() {
  //  perform_oob_culling_impl(actors_);
  perform_oob_culling_impl(bullets_);
}

void level::update(float delta) {
  perform_oob_culling();
  update_waves(delta);
  update_object(delta);
  check_collisions();
}

void level::update_object(float delta) {
  player_->update(delta);
  for (auto & a : actors_) {
    a->update(delta);
  }
  for (auto & b : bullets_) {
    b->update(delta);
  }
}

void level::check_collisions() {
  engine::scene::check_collisions();
  // TODO: This is a bad hack until I can properly disassociate collision info
  for (auto & b : bullets_) {
    if (math::intersects(player_->render_info().points,
                         b->render_info().points)) {
      player_->hit(*b);
    }
  }
}

void level::update_waves(float delta) {
  if (waves_.empty()) { return; }
  if ((wave_timer_.remainder -= delta) <= 0.f) {
    wave_timer_.remainder = wave_timer_.interval;
    for (auto & actor : waves_.front()) {
      actor->level(this);
      actors_.emplace_back(std::move(actor));
    }
    waves_.pop_front();
  }
}

void level::render(graphics::renderer & renderer) {
  renderer.draw(player_->render_info());
  for (auto & a : actors_) {
    renderer.draw(a->render_info());
  }
  for (auto & b : bullets_) {
    renderer.draw(b->render_info());
  }
}