/// <summary>
/// Get the OpenGL context current on the calling thread.
/// </summary>
/// <returns>
/// It returns the handle of the OpenGL context current on the calling thread. It may return <see cref="IntPtr.Zero"/>
/// indicating that no OpenGL context is current.
/// </returns>
public static IntPtr GetCurrentContext()
{
#if !MONODROID
if (Egl.IsRequired == false)
{
switch (Platform.CurrentPlatformId)
{
case Platform.Id.WindowsNT:
return(Wgl.GetCurrentContext());
case Platform.Id.Linux:
return(Glx.GetCurrentContext());
case Platform.Id.MacOS:
if (Glx.IsRequired)
{
return(Glx.GetCurrentContext());
}
else
{
throw new NotSupportedException("platform MacOS not supported without Glx.IsRequired=true");
}
default:
throw new NotSupportedException(String.Format("platform {0} not supported", Platform.CurrentPlatformId));
}
}
else
#endif
return(Egl.GetCurrentContext());
}
/// <summary>
/// Makes the context current on the calling thread.
/// </summary>
/// <param name="ctx">
/// A <see cref="IntPtr"/> that specify the context to be current on the calling thread, bound to
/// thise device context. It can be IntPtr.Zero indicating that no context will be current.
/// </param>
/// <returns>
/// It returns a boolean value indicating whether the operation was successful.
/// </returns>
/// <exception cref="NotSupportedException">
/// Exception thrown if the current platform is not supported.
/// </exception>
public override bool MakeCurrent(IntPtr ctx)
{
// Avoid actual call to wglMakeCurrent if it is not necessary
// Efficient on simple/nominal applications
IntPtr currentContext = Wgl.GetCurrentContext(), currentDc = Wgl.GetCurrentDC();
if (ctx == currentContext && _DeviceContext == currentDc)
return (true);
// Base implementation
return (base.MakeCurrent(ctx));
}
