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using System;
using System.ComponentModel;
using Android.Opengl;
using Javax.Microedition.Khronos.Opengles;
using EGLConfig = Javax.Microedition.Khronos.Egl.EGLConfig;
using Object = Java.Lang.Object;
namespace Xamarin.Forms.Platform.Android
{
internal class OpenGLViewRenderer : ViewRenderer<OpenGLView, GLSurfaceView>
{
bool _disposed;
public OpenGLViewRenderer()
{
AutoPackage = false;
}
protected override void Dispose(bool disposing)
{
if (!_disposed && disposing)
{
_disposed = true;
if (Element != null)
((IOpenGlViewController)Element).DisplayRequested -= Render;
}
base.Dispose(disposing);
}
protected override GLSurfaceView CreateNativeControl()
{
return new GLSurfaceView(Context);
}
protected override void OnElementChanged(ElementChangedEventArgs<OpenGLView> e)
{
base.OnElementChanged(e);
if (e.OldElement != null)
((IOpenGlViewController)Element).DisplayRequested -= Render;
if (e.NewElement != null)
{
GLSurfaceView surfaceView = Control;
if (surfaceView == null)
{
surfaceView = CreateNativeControl();
surfaceView.SetEGLContextClientVersion(2);
SetNativeControl(surfaceView);
}
((IOpenGlViewController)Element).DisplayRequested += Render;
surfaceView.SetRenderer(new Renderer(Element));
SetRenderMode();
}
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (e.PropertyName == OpenGLView.HasRenderLoopProperty.PropertyName)
SetRenderMode();
}
void Render(object sender, EventArgs eventArgs)
{
if (Element.HasRenderLoop)
return;
Control.RequestRender();
}
void SetRenderMode()
{
Control.RenderMode = Element.HasRenderLoop ? Rendermode.Continuously : Rendermode.WhenDirty;
}
class Renderer : Object, GLSurfaceView.IRenderer
{
readonly OpenGLView _model;
Rectangle _rect;
public Renderer(OpenGLView model)
{
_model = model;
}
public void OnDrawFrame(IGL10 gl)
{
Action<Rectangle> onDisplay = _model.OnDisplay;
if (onDisplay == null)
return;
onDisplay(_rect);
}
public void OnSurfaceChanged(IGL10 gl, int width, int height)
{
_rect = new Rectangle(0.0, 0.0, width, height);
}
public void OnSurfaceCreated(IGL10 gl, EGLConfig config)
{
}
}
}
}
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