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using System;
using System.ComponentModel;
using GLKit;
using OpenGLES;
using Foundation;
using CoreAnimation;
using RectangleF = CoreGraphics.CGRect;
namespace Xamarin.Forms.Platform.iOS
{
internal class OpenGLViewRenderer : ViewRenderer<OpenGLView, GLKView>
{
CADisplayLink _displayLink;
public void Display(object sender, EventArgs eventArgs)
{
if (Element.HasRenderLoop)
return;
SetupRenderLoop(true);
}
protected override void Dispose(bool disposing)
{
if (_displayLink != null)
{
_displayLink.Invalidate();
_displayLink.Dispose();
_displayLink = null;
if (Element != null)
((IOpenGlViewController)Element).DisplayRequested -= Display;
}
base.Dispose(disposing);
}
protected override void OnElementChanged(ElementChangedEventArgs<OpenGLView> e)
{
if (e.OldElement != null)
((IOpenGlViewController)e.OldElement).DisplayRequested -= Display;
if (e.NewElement != null)
{
var context = new EAGLContext(EAGLRenderingAPI.OpenGLES2);
var glkView = new GLKView(RectangleF.Empty) { Context = context, DrawableDepthFormat = GLKViewDrawableDepthFormat.Format24, Delegate = new Delegate(e.NewElement) };
SetNativeControl(glkView);
((IOpenGlViewController)e.NewElement).DisplayRequested += Display;
SetupRenderLoop(false);
}
base.OnElementChanged(e);
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (e.PropertyName == OpenGLView.HasRenderLoopProperty.PropertyName)
SetupRenderLoop(false);
}
void SetupRenderLoop(bool oneShot)
{
if (_displayLink != null)
return;
if (!oneShot && !Element.HasRenderLoop)
return;
_displayLink = CADisplayLink.Create(() =>
{
var control = Control;
var model = Element;
if (control != null)
control.Display();
if (control == null || model == null || !model.HasRenderLoop)
{
_displayLink.Invalidate();
_displayLink.Dispose();
_displayLink = null;
}
});
_displayLink.AddToRunLoop(NSRunLoop.Current, NSRunLoop.NSDefaultRunLoopMode);
}
class Delegate : GLKViewDelegate
{
readonly OpenGLView _model;
public Delegate(OpenGLView model)
{
_model = model;
}
public override void DrawInRect(GLKView view, RectangleF rect)
{
var onDisplay = _model.OnDisplay;
if (onDisplay == null)
return;
onDisplay(rect.ToRectangle());
}
}
}
}
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