Description

I'm encountering an issue while trying to use Skia-Python in headless mode with EGL. The ModernGL context is created successfully, but Skia is unable to detect it when the backend="egl" is used. However, it works correctly with non-EGL backends (e.g., glx or using glfw).

Here is the test code I'm using:

import moderngl
import skia
from PIL import Image

width, height = 800, 600

moderngl_context = moderngl.create_standalone_context(backend="egl")
print("ModernGL context:", moderngl_context)

skia_context = skia.GrDirectContext.MakeGL()
print("Skia context:", skia_context)

info = skia.ImageInfo.MakeN32Premul(width, height)

surface = skia.Surface.MakeRenderTarget(
    skia_context,
    skia.Budgeted.kYes,
    info
)

canvas = surface.getCanvas()
canvas.clear(skia.Color(255, 255, 255, 255))

paint = skia.Paint(
    Color=skia.Color(0, 100, 255, 200),
    Style=skia.Paint.kFill_Style,
    AntiAlias=True
)

canvas.drawCircle(width // 2, height // 2, min(width, height) // 4, paint)
canvas.flush()

image = surface.makeImageSnapshot()

pixels = image.tobytes()
image = Image.frombytes("RGBA", (width, height), pixels)
image.save('skia_circle.png')

Steps to Reproduce

1. Use the provided code with moderngl.create_standalone_context(backend="egl").
2. Observe that the skia.GrDirectContext.MakeGL() context is None.

Expected Behavior

Skia should detect the EGL-based ModernGL context and render as expected.

Actual Behavior

Skia fails to detect the EGL context, and skia.GrDirectContext.MakeGL() returns None.

Additional Notes

• The same code works when backend="glx" or when using glfw, which relies on xorg and GLX.
• Running headless with EGL is critical for our use case to avoid X11 dependencies.

Let me know if more details or logs are needed.