/// <summary>
/// Initializes a new instance of the <see cref="DeviceContextWGL"/> class.
/// </summary>
/// <param name='nativeBuffer'>
/// A <see cref="INativePBuffer"/> that specifies the P-Buffer used to create the device context.
/// </param>
/// <exception cref="ArgumentNullException">
/// Exception thrown if <paramref name="nativeBuffer"/> is null.
/// </exception>
/// <exception cref="ArgumentException">
/// Exception thrown if <paramref name="nativeBuffer"/> is not an instance created by
/// <see cref="DeviceContext.CreatePBuffer(DevicePixelFormat, uint, uint)"/>.
/// </exception>
/// <exception cref='InvalidOperationException'>
/// Is thrown when an operation cannot be performed.
/// </exception>
public DeviceContextWGL(INativePBuffer nativeBuffer)
{
if (nativeBuffer == null)
throw new ArgumentNullException("nativeBuffer");
NativePBuffer nativePBuffer = nativeBuffer as NativePBuffer;
if (nativePBuffer == null)
throw new ArgumentException("INativePBuffer not created with DeviceContext.CreatePBuffer");
if (!Wgl.CurrentExtensions.Pbuffer_ARB && !Wgl.CurrentExtensions.Pbuffer_EXT)
throw new InvalidOperationException("WGL_(ARB|EXT)_pbuffer not supported");
_WindowHandle = nativePBuffer.Handle;
if (Wgl.CurrentExtensions.Pbuffer_ARB)
_DeviceContext = Wgl.GetPbufferDCARB(nativePBuffer.Handle);
else
_DeviceContext = Wgl.GetPbufferDCEXT(nativePBuffer.Handle);
if (_DeviceContext == IntPtr.Zero)
throw new InvalidOperationException("unable to get device context");
_DeviceContextPBuffer = true;
IsPixelFormatSet = true;
}
