public static void Start(uint width, uint height, Type rootType)
{
GPUInfo.PrintGPUInfo();
#if DEBUG
OpenGLDebugCallback.Init();
#endif
if (rootType == null)
{
throw new InvalidOperationException("Root cannot be null!");
}
if (Root != null)
{
throw new InvalidOperationException("App already initialized!");
}
RenderSupport.HasOpenGLError = false;
Stage = new Stage(width, height);
DefaultJuggler = new Juggler();
Context = new Context();
renderSupport = new RenderSupport();
Root = (DisplayObject)Activator.CreateInstance(rootType);
Stage.AddChild(Root);
}
private void CalcBounds(DisplayObject obj,
Stage stage,
float scale,
bool intersectWithStage,
out Rectangle bounds,
out Rectangle boundsPOT)
{
float marginX;
float marginY;
// optimize for full-screen effects
if (obj == stage || obj == SparrowSharpApp.Root)
{
marginX = marginY = 0;
bounds = new Rectangle(0, 0, stage.Width, stage.Height);
}
else
{
marginX = MarginX;
marginY = MarginY;
bounds = obj.BoundsInSpace(stage);
}
if (intersectWithStage)
bounds = bounds.Intersection(stage.Bounds);
boundsPOT = null;
Rectangle result = bounds;
if (!result.IsEmpty())
{
// the bounds are a rectangle around the object, in stage coordinates,
// and with an optional margin.
bounds.Inflate(marginX, marginY);
// To fit into a POT-texture, we extend it towards the right and bottom.
int minSize = (int)(MIN_TEXTURE_SIZE / scale);
float minWidth = result.Width > minSize ? result.Width : minSize;
float minHeight = result.Height > minSize ? result.Height : minSize;
boundsPOT = new Rectangle(result.X,
result.Top,
NumberUtil.NextPowerOfTwo(minWidth * scale) / scale,
NumberUtil.NextPowerOfTwo(minHeight * scale) / scale);
}
}
