Make IOpenGLContext.HasContext context dependent (#6290)

This makes IOpenGLContext.HasContext not static and be implementable.

By doing this, we can support more than WGL and WGL.

This also allows the SDL2 headless version to run under Wayland.

Signed-off-by: Mary <mary@mary.zone>

src/Ryujinx.Graphics.OpenGL/IOpenGLContext.cs

@@ -7,21 +7,6 @@ namespace Ryujinx.Graphics.OpenGL
     {
         void MakeCurrent();
 
-        // TODO: Support more APIs per platform.
-        static bool HasContext()
-        {
-            if (OperatingSystem.IsWindows())
-            {
-                return WGLHelper.GetCurrentContext() != IntPtr.Zero;
-            }
-            else if (OperatingSystem.IsLinux())
-            {
-                return GLXHelper.GetCurrentContext() != IntPtr.Zero;
-            }
-            else
-            {
-                return false;
-            }
-        }
+        bool HasContext();
     }
 }