private void ApplyBlendMode()
{
string blendMode = _state.BlendMode;
if (blendMode != _actualBlendMode)
{
BlendMode.Get(_state.BlendMode).Activate();
_actualBlendMode = blendMode;
}
}
/// <summary>
/// Start your app.
/// </summary>
/// <param name="width">Stage width</param>
/// <param name="height">Stage height</param>
/// <param name="viewportHeight"></param>
/// <param name="viewportWidth"></param>
/// <param name="rootType">The root class of your app</param>
/// <exception cref="InvalidOperationException">When rootType is null or this function is called twice</exception>
/// <exception cref="NotSupportedException">When the OpenGL framebuffer creation fails.</exception>
/// <exception cref="ArgumentException">When width or height are less than 32.</exception>
public static void Start(uint width, uint height, uint viewportWidth, uint viewportHeight, Type rootType)
{
Debug.WriteLine("Sparrow starting");
if (width < 32 || height < 32 || viewportWidth < 32 || viewportHeight < 32)
{
throw new ArgumentException($"Invalid dimensions: {width}x{height}");
}
var ver = Gl.CurrentVersion;
if (ver.Api == "gl")
{
if (ver.Major < 4)
{
throw new NotSupportedException("You need at least OpenGL 4.0 to run Sparrow!");
}
}
else
{
if (ver.Major < 3)
{
throw new NotSupportedException("You need at least OpenGL ES 3.0 to run Sparrow!");
}
IsRunningOpenGLES = true;
}
Gl.Disable(EnableCap.CullFace);
Gl.Disable(EnableCap.Dither);
Gl.Enable(EnableCap.DepthTest);
Gl.DepthFunc(DepthFunction.Always);
BlendMode.Get(BlendMode.NORMAL).Activate();
FramebufferStatus status = Gl.CheckFramebufferStatus(FramebufferTarget.Framebuffer);
if (status != FramebufferStatus.FramebufferComplete)
{
throw new NotSupportedException("GL Framebuffer creation error. Status: " + status);
}
_viewPort = Rectangle.Create(0, 0, viewportWidth, viewportHeight);
_previousViewPort = Rectangle.Create();
GPUInfo.PrintGPUInfo();
// Desktop GL core profile needs a VAO for vertex attrib pointers to work.
uint vao = Gl.GenVertexArray();
Gl.BindVertexArray(vao);
if (rootType == null)
{
throw new InvalidOperationException("Root cannot be null!");
}
if (Root != null)
{
throw new InvalidOperationException("App already initialized!");
}
_painter = new Painter(width, height);
Stage = new Stage(width, height);
DefaultJuggler = new Juggler();
UpdateViewPort(true);
Root = (DisplayObject)Activator.CreateInstance(rootType);
Stage.AddChild(Root);
_frameId = 1; // starts with 1, so things on the first frame are cached
}