[BUG] Failed to bind EAGLDrawable on .NET 10 in MAUI iOS

[pauldendulk]

Description

We got a bug report with this error using the Mapsui MapControl with the latest SkiaSharp in MAUI running on .NET 10 (not in .NET 9).

I did not investigate this myself but there is not a lot of our own code involved. This is our Mapsui MapControl with all relevant code: https://github.com/Mapsui/Mapsui/blob/main/Mapsui.UI.Maui/MapControl.cs

Code

Some code from our MapControl.

    private void OnGLPaintSurface(object? sender, SKPaintGLSurfaceEventArgs args)
    {
        if (_glView?.GRContext is null)
        {
            // Could this be null before Home is called? If so we should change the logic.
            Logger.Log(LogLevel.Warning, "Refresh can not be called because GRContext is null");
            return;
        }

        // Called on UI thread
        PaintSurface(args.Surface.Canvas);
    }

    private void OnPaintSurface(object? sender, SKPaintSurfaceEventArgs args)
    {
        // Called on UI thread
        PaintSurface(args.Surface.Canvas);
    }

    private void PaintSurface(SKCanvas canvas)
    {
        if (GetPixelDensity() is not float pixelDensity)
            return;

        canvas.Scale(pixelDensity, pixelDensity);

        _renderController?.Render(canvas);
    }

Expected Behavior

No error and something rendered.

Actual Behavior

No error and a white canvas.

Version of SkiaSharp

3.116.0 (Current)

Last Known Good Version of SkiaSharp

2.88.9 (Previous)

IDE / Editor

Visual Studio (macOS)

Platform / Operating System

iOS

Platform / Operating System Version

iOS.

Devices

Dunno

Relevant Screenshots

No response

Relevant Log Output

Code of Conduct

• I agree to follow this project's Code of Conduct

[github-actions]

Triage Summary

Labels will be applied to indicate reliability concerns, platform specification (iOS), and the specific area of the issue related to SkiaSharp in .NET MAUI.

This issue is not categorized as a regression, assuming it is a newly identified bug.

Additional remarks:

• The issue primarily concerns the rendering of graphics on iOS using SkiaSharp, with no direct references to specific backends like Vulkan, OpenGL, or Metal.

Detailed Summary and Actions

Summary of the triage:

• A reliability issue is identified due to unexpected behavior in the rendering process, resulting in a white canvas.
• The issue is confirmed to occur on the iOS platform.
• The problem specifically pertains to SkiaSharp used within a .NET MAUI application, indicating relevance to mobile and desktop application views.

Summary of the actions that will be performed:

Action	Item	Description
Apply Label	tenet/reliability	The issue describes a bug that raises reliability concerns in the rendering process.
Apply Label	os/iOS	The issue explicitly mentions that it is occurring on the iOS platform.
Apply Label	area/SkiaSharp.Views.Maui	The issue involves a bug related to SkiaSharp in .NET MAUI applications affecting the views.

This entire triage process was automated by AI and mistakes may have been made. Please let us know so we can continue to improve.

[charlenni]

Perhaps the error messages are relevant:

2025-12-04 18:00:52.520025-0300 MapPOC[2726:29846] Failed to bind EAGLDrawable: <CAEAGLLayer: 0x600001767a40> to GL_RENDERBUFFER 1
2025-12-04 18:00:52.520110-0300 MapPOC[2726:29846] Failed to make complete multisample framebuffer object 8cd6
2025-12-04 18:00:52.520177-0300 MapPOC[2726:29846] Failed to make complete framebuffer object 8cd6
2025-12-04 18:00:52.526591-0300 MapPOC[2726:29846] Failed to bind EAGLDrawable: <CAEAGLLayer: 0x600001767a40> to GL_RENDERBUFFER 1
2025-12-04 18:00:52.526659-0300 MapPOC[2726:29846] Failed to make complete multisample framebuffer object 8cd6
2025-12-04 18:00:52.526720-0300 MapPOC[2726:29846] Failed to make complete framebuffer object 8cd6