p0_INT32

And last one, I found that font won't change even though I've import a font. 

Normally, `GLSurfaceView` doesn't provide any method to draw, so you need to set a renderer for a surface view. This is the document of `GLSurfaceView.IRenderer` : https://learn.microsoft.com/en-us/dotnet/api/android.opengl.glsurfaceview.irenderer?view=net-android-34.0 ```CSharp public interface...