public SDL2Renderer(SDL2Window window, int index, SDL.SDL_RendererFlags flags)
{
Renderer = SDL.SDL_CreateRenderer(window.Window, index, (uint)flags);
if (Renderer == IntPtr.Zero)
{
throw new Exception("SDL_CreateRenderer()", new Exception(SDL.SDL_GetError()));
}
}
private static void Main(string[] args)
{
// initialize SDL video
if (SDL.SDL_Init(SDL.SDL_INIT_VIDEO) != 0)
{
SDL.SDL_ShowSimpleMessageBox(SDL.SDL_MessageBoxFlags.SDL_MESSAGEBOX_ERROR, "SDL_Init()", SDL.SDL_GetError(), IntPtr.Zero);
return;
}
IsRunning = true;
// build SDL window and renderer
SDL2Window window = new SDL2Window("Demo", SDL.SDL_WINDOWPOS_CENTERED, SDL.SDL_WINDOWPOS_CENTERED, 640, 480, SDL.SDL_WindowFlags.SDL_WINDOW_RESIZABLE);
SDL2Renderer renderer = new SDL2Renderer(window, -1, SDL.SDL_RendererFlags.SDL_RENDERER_PRESENTVSYNC);
// set logical resolution for automatic scaling (letterboxing at larger resolutions)
RenderLogicalWidth = 640;
RenderLogicalHeight = 480;
renderer.RenderSetLogicalSize(640, 480);
uint currentTic = 0;
uint currentFrame = 0;
uint previousTime = SDL.SDL_GetTicks();
uint lag = 0;
// initialize demo state machine into "edit" mode
// i.e. "place obstacles and traffic lanes" mode
StateMachine stateMachine = new StateMachine();
EditState editState = new EditState(stateMachine);
stateMachine.PushState(editState);
// demo time!
while (IsRunning)
{
// Uh, won't this overflow eventually?
uint currentTime = SDL.SDL_GetTicks();
uint elapsedTime = currentTime - previousTime;
previousTime = currentTime;
lag += elapsedTime;
// input
stateMachine.DoEvents();
// fixed logic rate
while (lag >= MillisecondsPerTic)
{
// logic
stateMachine.DoLogic(currentTic);
lag -= MillisecondsPerTic;
currentTic++;
}
// render
renderer.SetRenderDrawColor(0, 0, 0, 255);
renderer.RenderClear();
// recalculate ms per tic as a double value
stateMachine.DoRender(lag / (1000.0 / TicsPerSecond), renderer);
renderer.RenderPresent();
currentFrame++;
}
// dipose SDL resources
window.Dispose();
renderer.Dispose();
// uninitialize SDL
SDL.SDL_Quit();
}