/// <summary>
/// Tells each screen to draw itself.
/// </summary>
public override void Draw(GameTime gameTime)
{
foreach (GameScreen screen in _screens)
{
if (screen.ScreenState == ScreenState.TransitionOn ||
screen.ScreenState == ScreenState.TransitionOff ||
screen.ScreenState == ScreenState.Active)
{
screen.PreDraw(gameTime);
GraphicsDevice.SetRenderTarget(null);
}
}
int transitionCount = 0;
foreach (GameScreen screen in _screens)
{
if (screen.ScreenState == ScreenState.TransitionOn ||
screen.ScreenState == ScreenState.TransitionOff)
{
++transitionCount;
if (_transitions.Count < transitionCount)
{
PresentationParameters _pp = GraphicsDevice.PresentationParameters;
_transitions.Add(new RenderTarget2D(GraphicsDevice, _pp.BackBufferWidth, _pp.BackBufferHeight, false, SurfaceFormat.Color, _pp.DepthStencilFormat, _pp.MultiSampleCount, RenderTargetUsage.DiscardContents));
}
GraphicsDevice.SetRenderTarget(_transitions[transitionCount - 1]);
GraphicsDevice.Clear(Color.Transparent);
screen.Draw(gameTime);
GraphicsDevice.SetRenderTarget(null);
}
}
GraphicsDevice.Clear(Color.Black);
transitionCount = 0;
foreach (GameScreen screen in _screens)
{
if (screen.ScreenState == ScreenState.Hidden)
{
continue;
}
if (screen.ScreenState == ScreenState.TransitionOn || screen.ScreenState == ScreenState.TransitionOff)
{
SpriteBatch.Begin(SpriteSortMode.Deferred, BlendState.AlphaBlend);
SpriteBatch.Draw(_transitions[transitionCount], Vector2.Zero, Color.White * screen.TransitionAlpha);
SpriteBatch.End();
++transitionCount;
}
else
{
screen.Draw(gameTime);
}
}
_input.Draw();
}