/// <summary>Begins the game by performing the following cycle events in this order: Initialize, LoadContent,
/// CheckInputs, Update, Draw, UnloadContent.
/// </summary>
public void Start(GameEngineInitializeType types)
{
PerformInitialize(types);
PerformLoadContent();
while (!IsExiting)
{
SDL.SDL_Event rawEvent = new SDL.SDL_Event();
while (SDL.SDL_PollEvent(out rawEvent) == 1)
{
logger?.LogTrace($"SDL_Event: {rawEvent.type.ToString()}");
EventManager.RaiseEvent(rawEvent);
}
Tick();
}
PerformUnloadContent();
Dispose();
}
/// <summary>Initializes the game by calling initialize on the SDL2 instance with the passed flags
/// or "EVERYTHING" if 0. Additionally, this method will initialize SDL_ttf and SDL_image to load fonts and images.
/// </summary>
/// <param name="types">Bit flags indicating the way in which SDL should be initialized</param>
private void InitializeBase(GameEngineInitializeType types)
{
if (SDL.SDL_Init((uint)types) != 0)
{
throw new InvalidOperationException($"SDL_Init: {SDL.SDL_GetError()}");
}
if (SDL_ttf.TTF_Init() != 0)
{
throw new InvalidOperationException($"TTF_Init: {SDL.SDL_GetError()}");
}
SDL_image.IMG_InitFlags initImageFlags =
SDL_image.IMG_InitFlags.IMG_INIT_JPG
| SDL_image.IMG_InitFlags.IMG_INIT_PNG
| SDL_image.IMG_InitFlags.IMG_INIT_TIF
| SDL_image.IMG_InitFlags.IMG_INIT_WEBP;
int initImageResult = SDL_image.IMG_Init(initImageFlags);
if ((initImageResult & (int)initImageFlags) != (int)initImageFlags)
{
throw new InvalidOperationException($"IMG_Init: {SDL.SDL_GetError()}");
}
}
/// <summary>Override to initialize any custom objects or large helpers that are required by the game.
/// </summary>
private void PerformInitialize(GameEngineInitializeType types)
{
InitializeBase(types);
Initialize();
}
