Where should libGLESv2.so live for proper library loading

[dougcooper]

I cannot stop uno from falling back to software rendering. On my system libGLES is located at /usr/lib/libGLESv2.so.2.0.0.

[jeromelaban]

Thanks for the question. Can you show the application logs? You can enable more logging by adding "Uno.UI.Runtime.Skia.GLValidationSurface" at the Trace log level.

[dougcooper]

based on the previous log message is it safe to assume the library was loaded and i am not 3.0 compatible?

public static void TryValidateExtensions()
{
	if (typeof(OpenGLESRenderSurface).Log().IsEnabled(LogLevel.Debug))
	{
		typeof(OpenGLESRenderSurface).Log().Debug($"Validating OpenGL Extensions");
	}

	var extensions = new GL(NativeContext).GetStringS(GLEnum.Extensions);
	var hasARBVertexArrayObject = extensions?.Contains("GL_ARB_vertex_array_object");

	if (hasARBVertexArrayObject.HasValue
		&& hasARBVertexArrayObject == false
		&& typeof(OpenGLESRenderSurface).Log().IsEnabled(LogLevel.Error))
	{
		// In this case, the GTK runtime will terminate the app
		// if some OpenGL extensions cannot be found. This can happen
		// when the target video device does not provide the required support.
		//
		// For example, this is the error that may be raised:
		//
		// No provider of glGenVertexArrays found.  Requires one of:
		// Desktop OpenGL 3.0

		// GL_ARB_vertex_array_object
		// OpenGL ES 3.0
		// GL_APPLE_vertex_array_object
		// GL_OES_vertex_array_object


		typeof(OpenGLESRenderSurface).Log().Error(
			$"OpenGL support on this system is missing extension \"GL_ARB_vertex_array_object\", you may need to enable software " +
			$"rendering. (https://platform.uno/docs/articles/features/using-skia-gtk.html#changing-the-rendering-target)");
	}

}

[jeromelaban]

This would be the case indeed. It may be that your graphics driver does not provide the appropriate extensions for what GTK expects.

[dougcooper]

i did some more research over the weekend and believe the issue is that gles3+ for our gpu is supported through vulkan. while i havent evaluated the avalonia PR with our hardware, it might be something worth considering for your roadmap.

[jeromelaban]

Thanks for the feedback, we're tracking this in #4309.

[dougcooper]

Oh man a 2 year old epic is a heck of an epic. 😜

[dougcooper]

@jeromelaban In doing some more research on our gpu it should in fact support opengl 3.0 under vulkan AND gallium. As far as I understand so far, gallium is a layer under gles that abstracts the gpu specific implementation. Can you perhaps help me close the loop on the loader aspects to confirm the library is being loaded properly and not just failing simultaneously with the validation step?

[jeromelaban]

You can try changing this porition yourself and let us know, though if the returned extensions are null, it's likely that GTK will fail as a result.