internal void RunIteration(NSTimer timer)
{
var curUpdateTime = stopwatch.Elapsed;
if (prevUpdateTime == TimeSpan.Zero)
{
prevUpdateTime = curUpdateTime;
}
var t = (curUpdateTime - prevUpdateTime).TotalSeconds;
updateEventArgs.Time = t;
OnUpdateFrame(updateEventArgs);
prevUpdateTime = curUpdateTime;
gl.BindFramebuffer(All.FramebufferOes, framebuffer);
var curRenderTime = stopwatch.Elapsed;
if (prevRenderTime == TimeSpan.Zero)
{
prevRenderTime = curRenderTime;
}
t = (curRenderTime - prevRenderTime).TotalSeconds;
renderEventArgs.Time = t;
OnRenderFrame(renderEventArgs);
prevRenderTime = curRenderTime;
}
protected virtual void CreateFrameBuffer()
{
AssertValid();
if (LayerColorFormat == null)
{
throw new InvalidOperationException("Set the LayerColorFormat property to an EAGLColorFormat value before calling Run().");
}
CAEAGLLayer eaglLayer = (CAEAGLLayer)Layer;
eaglLayer.DrawableProperties = NSDictionary.FromObjectsAndKeys(
new NSObject [] { NSNumber.FromBoolean(LayerRetainsBacking), LayerColorFormat },
new NSObject [] { EAGLDrawableProperty.RetainedBacking, EAGLDrawableProperty.ColorFormat }
);
ConfigureLayer(eaglLayer);
GraphicsContext = Utilities.CreateGraphicsContext(ContextRenderingApi);
gl = GLCalls.GetGLCalls(ContextRenderingApi);
gl.GenFramebuffers(1, ref framebuffer);
gl.BindFramebuffer(All.FramebufferOes, framebuffer);
gl.GenRenderbuffers(1, ref renderbuffer);
gl.BindRenderbuffer(All.RenderbufferOes, renderbuffer);
if (!EAGLContext.RenderBufferStorage((uint)All.RenderbufferOes, eaglLayer))
{
throw new InvalidOperationException("Error with EAGLContext.RenderBufferStorage!");
}
gl.FramebufferRenderbuffer(All.FramebufferOes, All.ColorAttachment0Oes, All.RenderbufferOes, renderbuffer);
Size newSize = new Size(
(int)Math.Round(eaglLayer.Bounds.Size.Width),
(int)Math.Round(eaglLayer.Bounds.Size.Height));
Size = newSize;
gl.Viewport(0, 0, newSize.Width, newSize.Height);
gl.Scissor(0, 0, newSize.Width, newSize.Height);
frameBufferWindow = new WeakReference(Window);
frameBufferLayer = new WeakReference(Layer);
}