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+/*
+ * Copyright 2022 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef CANDY_GEAR_CORE_H
+#define CANDY_GEAR_CORE_H 1
+
+#include <mruby.h>
+#include <mruby/class.h>
+#include <mruby/compile.h>
+#include <mruby/data.h>
+#include <mruby/dump.h>
+#include <mruby/variable.h>
+
+#include <SDL2/SDL.h>
+#include <SDL2/SDL_image.h>
+#include <SDL2/SDL_mixer.h>
+#include <SDL2/SDL_ttf.h>
+
+#include "loader.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * The Core class stores all global states that the engine needs to work.
+ * Global variables are not evil if you use them carefully.
+ */
+typedef struct
+{
+  const char *config_file;
+
+  /// Text displayed in the game window.
+  char *game_name;
+
+  /**
+   * @{
+   * This is the amount of pixel the games use to render a buffer. The image in
+   * this buffer is then rendered to the screen.
+   */
+  int game_width, game_height;
+  /// @}
+
+  /**
+   * @{
+   * This is the ammount of pixel that the games uses when rendering to the
+   * screen.
+   */
+  int screen_width, screen_height;
+  /// @}
+
+  Uint32 fps;
+  Uint32 max_frame_duration_ms;
+
+  SDL_Window *window;
+  SDL_Renderer *renderer;
+
+  /// All rendering goes here before they are moved to the screen.
+  SDL_Texture *pre_screen_buffer;
+  SDL_Rect screen_rect;
+
+  SDL_bool quit_game;
+} cg_sCore;
+
+extern cg_sCore cg_core;
+
+/// \memberof cg_sCore @{
+
+void
+cg_Core_init(LoaderStack *loader);
+
+SDL_bool
+cg_Core_load(LoaderStack *loader);
+
+void
+cg_Core_unload(LoaderStack *loader);
+
+/// @}
+
+#ifdef __cplusplus
+};
+#endif
+
+#endif /* CANDY_GEAR_CORE_H */