punchie-engine/src/GameEngine.c

#include "GameEngine.h"
#include "AssetManager.h"
#include "ObjectStore.h"
#include "Renderer.h"
#include "SDL.h"
#include "SDL_error.h"
#include "SDL_events.h"
#include "SDL_image.h"
#include "SDL_pixels.h"
#include "SDL_render.h"
#include "Window.h"
#include "constants.h"
#include "engine_build_config.h"
#include "reusable_ids.h"
#include <stdbool.h>
#include <stdlib.h>

#ifdef DEBUG_ENGINE
#include <stdio.h>
#endif /* DEBUG_ENGINE */

INTERNAL struct game {
  bool running;
  float delta;
  Window window;
  SDL_Event event;
  ObjectStore *object_store;
  AssetManager *asset_manager;
} Game;

bool init_game(const char *game_name, int window_width, int window_height,
               SDL_Color window_background_color, bool full_screen) {
  bool initialisation_complete = true;

  if (SDL_Init(SDL_INIT_EVERYTHING) != 0) {
#ifdef DEBUG_ENGINE
    printf("Failed to initialise SDL. Error: %s\n", SDL_GetError());
#endif /* DEBUG_ENGINE */

    return false;
  }

  if (IMG_Init(IMG_INIT_PNG) != IMG_INIT_PNG) {
    initialisation_complete = false;
  }

  if (!init_window(&(Game.window), game_name, window_width, window_height,
                   window_background_color, full_screen)) {
#ifdef DEBUG_ENGINE
    printf("Failed to initialise window\n");
#endif /* DEBUG_ENGINE */

    initialisation_complete = false;
  }

  Game.object_store = create_object_store();

  if (!(Game.object_store)) {
    initialisation_complete = false;
  }

  Game.asset_manager = create_asset_manager();

  if (!(Game.asset_manager)) {
    initialisation_complete = false;
  }

  if (!initialisation_complete) {
    close_game();

    return false;
  }

  Game.running = true;
  // Game.delta = 0.0f;
  Game.delta = 1.0f / 60.0f;

#ifdef DEBUG_ENGINE
  printf("Game initialised successfully\n");
#endif /* DEBUG_ENGINE */

  return true;
}

bool game_running() { return Game.running; }

ObjectID add_object(void *object, EventHandlerPtr event_handler,
                    UpdateFuncPtr update_func, RenderFuncPtr render_func) {
  if (!(Game.running) || !(Game.object_store)) {
    return -1;
  }

  return add_object_to_store(Game.object_store, object, event_handler,
                             update_func, render_func);
}

void remove_object(ObjectID id) {
  if (!(Game.running) || !(Game.object_store)) {
    return;
  }

  remove_object_from_store(Game.object_store, id);
}

AssetID load_asset(const char *path, AssetType type) {
  return type == ASSET_TYPE_IMAGE
             ? load_asset_to_manager(Game.asset_manager, path, type,
                                     Game.window.renderer)
             : load_asset_to_manager(Game.asset_manager, path, type, NULL);
}

void render_texture_asset(AssetID id, float x, float y, float w, float h) {
  if (id < 0) {
    return;
  }

  SDL_Texture *texture = get_texture(Game.asset_manager, id);

  render_texture(Game.window.renderer, texture, x, y, w, h);
}

void close_asset(AssetID id) {
  remove_asset_from_manager(Game.asset_manager, id);
}

void handle_events() {
  if (!(Game.running)) {
    return;
  }

  while (SDL_PollEvent(&(Game.event))) {
    switch (Game.event.type) {
    case SDL_QUIT:
      Game.running = false;
      break;
    }

    if (!Game.object_store) {
      break;
    }

    handle_all_objects_events(Game.object_store, &(Game.event));
  }
}

void update() {
  if (!(Game.running) || !(Game.object_store)) {
    return;
  }

  update_all_objects(Game.object_store, Game.delta);
}

void render() {
  if (!(Game.running)) {
    return;
  }

  clear_window(&(Game.window));

  if (Game.object_store) {
    render_all_objects(Game.object_store);
  }

  swap_render_buffers(&(Game.window));
}

void close_game() {
  destroy_asset_manager(Game.asset_manager);
  Game.asset_manager = NULL;

  destroy_object_store(Game.object_store);
  Game.object_store = NULL;

  destroy_window(&(Game.window));

  Game.delta = 0.0f;

  Game.running = false;

  IMG_Quit();

  SDL_Quit();

#ifdef DEBUG_ENGINE
  printf("Game closed successfully\n");
#endif /* DEBUG_ENGINE */
}