iOS implementation uses deprecated EAGLContext

[dluciano]

Hi, I’m new here and have been experimenting with Skia shaders. I created a simple app to render shaders from [ShaderToy](https://www.shadertoy.com/), and while the app works great on macOS, it’s unusable on iOS. After investigating, I found that SKGLViewHandler uses SKGLView, which in the iOS implementation creates the deprecated EAGLContext ([Apple Documentation](https://developer.apple.com/documentation/opengles/eaglcontext)).

Is this intentional? Does Skia only support OpenGL on iOS? Is there any plan to implement Metal for iOS?

Also, I'm testing on the iOS simulator, so it's possible the simulator isn’t utilizing the GPU (which may be my error), but even if I’m doing something wrong, it seems that SKGLView on iOS is using a deprecated dependency.

Here’s the method creating the deprecated context:

// https://github.com/mono/SkiaSharp/blob/main/source/SkiaSharp.Views/SkiaSharp.Views/Platform/iOS/SKGLView.cs
private void Initialize()
		{
			designMode = ((IComponent)this).Site?.DesignMode == true || !EnvironmentExtensions.IsValidEnvironment;

			if (designMode)
				return;

			// create the GL context
			Context = new EAGLContext(EAGLRenderingAPI.OpenGLES2);
			DrawableColorFormat = GLKViewDrawableColorFormat.RGBA8888;
			DrawableDepthFormat = GLKViewDrawableDepthFormat.Format24;
			DrawableStencilFormat = GLKViewDrawableStencilFormat.Format8;
			DrawableMultisample = GLKViewDrawableMultisample.Sample4x;

			// hook up the drawing 
			Delegate = this;
		}

My code https://github.com/dluciano/skiaaot. And some screenshots
The important code is: https://github.com/dluciano/skiaaot/blob/main/SkiaAot/MainPage.cs

There are two version of the shader in the code, the one I used is a simple random pattern but the one I wanna used is the 'beornottobemain' that contains a cloud simulation. The cloud simulation works great in Mac but it does even move in the iossimulator.

Desktop:

Screen.Recording.2024-11-24.at.21.44.03.mov

iOS Sim

Screen.Recording.2024-11-24.at.21.45.52.mov

Any insights or guidance on this would be greatly appreciated. Thanks!