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Added workaround for wglMakeCurrent error 6

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On some drivers and virtual machines, wglMakeCurrent may fail with a
code 6 when first called. The suggested workaround is to call it in a
loop until it succeeds. See
https://www.opengl.org/discussion_boards/showthread.php/171058-nVidia-wglMakeCurrent()-multiple-threads
This commit is contained in:
Stefanos A. 2013-11-14 17:37:39 +01:00
parent 2e14ca59b2
commit 0ee72856e4
1 changed files with 23 additions and 6 deletions
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29
Source/OpenTK/Platform/Windows/WinGLContext.cs
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@ -1,4 +1,4 @@
#region --- License ---
#region --- License ---
/* Copyright (c) 2006, 2007 Stefanos Apostolopoulos
* Contributions from Erik Ylvisaker
* See license.txt for license info
@ -71,12 +71,29 @@ namespace OpenTK.Platform.Windows
ContextHandle temp_context = new ContextHandle(Wgl.Imports.CreateContext(window.DeviceContext));
if (temp_context != ContextHandle.Zero)
{
bool success = Wgl.Imports.MakeCurrent(window.DeviceContext, temp_context.Handle);
if (!success)
Debug.Print("wglMakeCurrent failed with error: {0}", Marshal.GetLastWin32Error());
Wgl.LoadAll();
// Make the context current.
// Note: on some video cards and on some virtual machines, wglMakeCurrent
// may fail with an errorcode of 6 (INVALID_HANDLE). The suggested workaround
// is to call wglMakeCurrent in a loop until it succeeds.
// See https://www.opengl.org/discussion_boards/showthread.php/171058-nVidia-wglMakeCurrent()-multiple-threads
// Sigh...
for (int retry = 0; retry < 5; retry++)
{
bool success = Wgl.Imports.MakeCurrent(window.DeviceContext, temp_context.Handle);
if (!success)
{
Debug.Print("wglMakeCurrent failed with error: {0}. Retrying", Marshal.GetLastWin32Error());
System.Threading.Thread.Sleep(10);
}
else
{
// wglMakeCurrent succeeded, we are done here!
break;
}
}
// Destroy temporary context
// Load wgl extensions and destroy temporary context
Wgl.LoadAll();
Wgl.Imports.MakeCurrent(IntPtr.Zero, IntPtr.Zero);
Wgl.Imports.DeleteContext(temp_context.Handle);
}