/// <summary>
/// Creates a context.
/// </summary>
/// <param name="sharedContext">
/// A <see cref="IntPtr"/> that specify a context that will share objects with the returned one. If
/// it is IntPtr.Zero, no sharing is performed.
/// </param>
/// <returns>
/// A <see cref="IntPtr"/> that represents the handle of the created context. If the context cannot be
/// created, it returns IntPtr.Zero.
/// </returns>
/// <exception cref="InvalidOperationException">
/// Exception thrown in the case <paramref name="sharedContext"/> is different from IntPtr.Zero, and the objects
/// cannot be shared with it.
/// </exception>
public override IntPtr CreateContext(IntPtr sharedContext)
{
IntPtr renderContext = IntPtr.Zero;
if (Wgl.CurrentExtensions == null || Wgl.CurrentExtensions.CreateContext_ARB == false)
{
try {
renderContext = Wgl.CreateContext(_DeviceContext);
if ((renderContext != IntPtr.Zero) && (sharedContext != IntPtr.Zero))
{
bool res = Wgl.ShareLists(renderContext, sharedContext);
Debug.Assert(res);
}
return(renderContext);
} catch {
if (renderContext != IntPtr.Zero)
{
bool res = Wgl.DeleteContext(renderContext);
Debug.Assert(res);
}
throw;
}
}
else
{
return(CreateContextAttrib(sharedContext, new int[] { Gl.NONE }));
}
}
/// <summary>
/// Creates a context.
/// </summary>
/// <param name="sharedContext">
/// A <see cref="IntPtr"/> that specify a context that will share objects with the returned one. If
/// it is IntPtr.Zero, no sharing is performed.
/// </param>
/// <returns>
/// A <see cref="IntPtr"/> that represents the handle of the created context. If the context cannot be
/// created, it returns IntPtr.Zero.
/// </returns>
/// <exception cref="InvalidOperationException">
/// Exception thrown in the case <paramref name="sharedContext"/> is different from IntPtr.Zero, and the objects
/// cannot be shared with it.
/// </exception>
public override IntPtr CreateContext(IntPtr sharedContext)
{
IntPtr renderContext = IntPtr.Zero;
try {
renderContext = Wgl.CreateContext(DeviceContext);
if ((renderContext != IntPtr.Zero) && (sharedContext != IntPtr.Zero))
{
bool res = Wgl.ShareLists(renderContext, sharedContext);
Debug.Assert(res);
}
return(renderContext);
} catch {
if (renderContext != IntPtr.Zero)
{
bool res = Wgl.DeleteContext(renderContext);
Debug.Assert(res);
}
throw;
}
}
