// Note: there is no relevant ARB function.
internal static GraphicsMode SetGraphicsModePFD(WinGraphicsMode mode_selector,
GraphicsMode mode, WinWindowInfo window)
{
Debug.Write("Setting pixel format... ");
if (window == null)
{
throw new ArgumentNullException("window", "Must point to a valid window.");
}
if (!mode.Index.HasValue)
{
mode = mode_selector.SelectGraphicsMode(
mode.ColorFormat, mode.Depth, mode.Stencil,
mode.Samples, mode.AccumulatorFormat,
mode.Buffers, mode.Stereo);
}
PixelFormatDescriptor pfd = new PixelFormatDescriptor();
Functions.DescribePixelFormat(
window.DeviceContext, (int)mode.Index.Value,
API.PixelFormatDescriptorSize, ref pfd);
Debug.WriteLine(mode.Index.ToString());
if (!Functions.SetPixelFormat(window.DeviceContext, (int)mode.Index.Value, ref pfd))
{
throw new GraphicsContextException(String.Format(
"Requested GraphicsMode not available. SetPixelFormat error: {0}",
Marshal.GetLastWin32Error()));
}
return(mode);
}
private IEnumerable <GraphicsMode> GetModesPFD(INativeWindow native)
{
WinWindowInfo window = native.WindowInfo as WinWindowInfo;
IntPtr deviceContext = window.DeviceContext;
PixelFormatDescriptor pfd = new PixelFormatDescriptor();
pfd.Size = API.PixelFormatDescriptorSize;
pfd.Version = API.PixelFormatDescriptorVersion;
pfd.Flags = PixelFormatDescriptorFlags.DRAW_TO_WINDOW | PixelFormatDescriptorFlags.SUPPORT_OPENGL;
if (Environment.OSVersion.Version.Major >= 6)
{
pfd.Flags |= PixelFormatDescriptorFlags.SUPPORT_COMPOSITION;
}
// ISSUE: reference to a compiler-generated field
this.\u003C\u003E7__wrapc = new bool[2]
{
false,
true
};
bool[] flagArray;
for (int index = 0; index < flagArray.Length; ++index)
{
bool generic_allowed = flagArray[index];
int pixel = 0;
while (WinGraphicsMode.DescribePixelFormat(deviceContext, ++pixel, (int)API.PixelFormatDescriptorSize, ref pfd) != 0)
{
if (generic_allowed || (pfd.Flags & PixelFormatDescriptorFlags.GENERIC_FORMAT) == (PixelFormatDescriptorFlags)0)
{
GraphicsMode fmt = new GraphicsMode(new IntPtr?((IntPtr)pixel), new ColorFormat((int)pfd.RedBits, (int)pfd.GreenBits, (int)pfd.BlueBits, (int)pfd.AlphaBits), (int)pfd.DepthBits, (int)pfd.StencilBits, 0, new ColorFormat((int)pfd.AccumBits), (pfd.Flags & PixelFormatDescriptorFlags.DOUBLEBUFFER) != (PixelFormatDescriptorFlags)0 ? 2 : 1, (pfd.Flags & PixelFormatDescriptorFlags.STEREO) != (PixelFormatDescriptorFlags)0);
yield return(fmt);
}
}
}
}
public TemporaryContext(IntPtr native)
{
Debug.WriteLine("[WGL] Creating temporary context to load extensions");
if (native == null)
{
throw new ArgumentNullException();
}
// Create temporary context and load WGL entry points
// First, set a compatible pixel format to the device context
// of the temp window
WinWindowInfo window = new WinWindowInfo
{
Handle = native
};
WinGraphicsMode selector = new WinGraphicsMode(window.DeviceContext);
WinGLContext.SetGraphicsModePFD(selector, GraphicsMode.Default, window);
bool success = false;
// Then, construct a temporary context and load all wgl extensions
Context = new ContextHandle(Wgl.CreateContext(window.DeviceContext));
if (Context != ContextHandle.Zero)
{
// 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 && !success; retry++)
{
success = Wgl.MakeCurrent(window.DeviceContext, Context.Handle);
if (!success)
{
Debug.Print("wglMakeCurrent failed with error: {0}. Retrying", Marshal.GetLastWin32Error());
System.Threading.Thread.Sleep(10);
}
}
}
else
{
Debug.Print("[WGL] CreateContext failed with error: {0}", Marshal.GetLastWin32Error());
}
if (!success)
{
Debug.WriteLine("[WGL] Failed to create temporary context");
}
}
public TemporaryContext(INativeWindow native)
{
Debug.WriteLine("[WGL] Creating temporary context to load extensions");
if (native == null)
throw new ArgumentNullException();
// Create temporary context and load WGL entry points
// First, set a compatible pixel format to the device context
// of the temp window
WinWindowInfo window = native.WindowInfo as WinWindowInfo;
WinGraphicsMode selector = new WinGraphicsMode(window.DeviceContext);
WinGLContext.SetGraphicsModePFD(selector, GraphicsMode.Default, window);
bool success = false;
// Then, construct a temporary context and load all wgl extensions
Context = new ContextHandle(Wgl.CreateContext(window.DeviceContext));
if (Context != ContextHandle.Zero)
{
// 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 && !success; retry++)
{
success = Wgl.MakeCurrent(window.DeviceContext, Context.Handle);
if (!success)
{
Debug.Print("wglMakeCurrent failed with error: {0}. Retrying", Marshal.GetLastWin32Error());
System.Threading.Thread.Sleep(10);
}
}
}
else
{
Debug.Print("[WGL] CreateContext failed with error: {0}", Marshal.GetLastWin32Error());
}
if (!success)
{
Debug.WriteLine("[WGL] Failed to create temporary context");
}
}
public WinGLContext(GraphicsMode format, WinWindowInfo window, IGraphicsContext sharedContext,
int major, int minor, GraphicsContextFlags flags)
{
// There are many ways this code can break when accessed by multiple threads. The biggest offender is
// the sharedContext stuff, which will only become valid *after* this constructor returns.
// The easiest solution is to serialize all context construction - hence the big lock, below.
lock (LoadLock)
{
if (window == null)
{
throw new ArgumentNullException("window", "Must point to a valid window.");
}
if (window.Handle == IntPtr.Zero)
{
throw new ArgumentException("window", "Must be a valid window.");
}
IntPtr current_context = Wgl.GetCurrentContext();
INativeWindow temp_window = null;
TemporaryContext temp_context = null;
try
{
if (current_context == IntPtr.Zero)
{
// Create temporary context to load WGL extensions
temp_window = new NativeWindow();
temp_context = new TemporaryContext(temp_window);
current_context = Wgl.GetCurrentContext();
if (current_context != IntPtr.Zero && current_context == temp_context.Context.Handle)
{
new Wgl().LoadEntryPoints();
}
}
Debug.Print("OpenGL will be bound to window:{0} on thread:{1}", window.Handle,
System.Threading.Thread.CurrentThread.ManagedThreadId);
ModeSelector = new WinGraphicsMode(window.DeviceContext);
Mode = SetGraphicsModePFD(ModeSelector, format, (WinWindowInfo)window);
if (Wgl.SupportsFunction("wglCreateContextAttribsARB"))
{
try
{
Debug.Write("Using WGL_ARB_create_context... ");
List <int> attributes = new List <int>();
attributes.Add((int)ArbCreateContext.MajorVersion);
attributes.Add(major);
attributes.Add((int)ArbCreateContext.MinorVersion);
attributes.Add(minor);
if (flags != 0)
{
attributes.Add((int)ArbCreateContext.ContextFlags);
attributes.Add((int)GetARBContextFlags(flags));
attributes.Add((int)ArbCreateContext.ProfileMask);
attributes.Add((int)GetARBContextProfile(flags));
}
// According to the docs, " <attribList> specifies a list of attributes for the context.
// The list consists of a sequence of <name,value> pairs terminated by the
// value 0. [...]"
// Is this a single 0, or a <0, 0> pair? (Defensive coding: add two zeroes just in case).
attributes.Add(0);
attributes.Add(0);
Handle = new ContextHandle(
Wgl.Arb.CreateContextAttribs(
window.DeviceContext,
sharedContext != null ? (sharedContext as IGraphicsContextInternal).Context.Handle : IntPtr.Zero,
attributes.ToArray()));
if (Handle == ContextHandle.Zero)
{
Debug.Print("failed. (Error: {0})", Marshal.GetLastWin32Error());
}
}
catch (Exception e) { Debug.Print(e.ToString()); }
}
if (Handle == ContextHandle.Zero)
{
// Failed to create GL3-level context, fall back to GL2.
Debug.Write("Falling back to GL2... ");
Handle = new ContextHandle(Wgl.CreateContext(window.DeviceContext));
if (Handle == ContextHandle.Zero)
{
Handle = new ContextHandle(Wgl.CreateContext(window.DeviceContext));
}
if (Handle == ContextHandle.Zero)
{
throw new GraphicsContextException(
String.Format("Context creation failed. Wgl.CreateContext() error: {0}.",
Marshal.GetLastWin32Error()));
}
}
Debug.WriteLine(String.Format("success! (id: {0})", Handle));
}
finally
{
if (temp_context != null)
{
temp_context.Dispose();
temp_context = null;
}
if (temp_window != null)
{
temp_window.Dispose();
temp_window = null;
}
}
}
// Todo: is this comment still true?
// On intel drivers, wgl entry points appear to change
// when creating multiple contexts. As a workaround,
// we reload Wgl entry points every time we create a
// new context - this solves the issue without any apparent
// side-effects (i.e. the old contexts can still be handled
// using the new entry points.)
// Sigh...
MakeCurrent(window);
new Wgl().LoadEntryPoints();
if (sharedContext != null)
{
Marshal.GetLastWin32Error();
Debug.Write(String.Format("Sharing state with context {0}: ", sharedContext));
bool result = Wgl.ShareLists((sharedContext as IGraphicsContextInternal).Context.Handle, Handle.Handle);
Debug.WriteLine(result ? "success!" : "failed with win32 error " + Marshal.GetLastWin32Error());
}
}
static WinGLContext()
{
lock (LoadLock)
{
// Dynamically load opengl32.dll in order to use the extension loading capabilities of Wgl.
if (opengl32Handle == IntPtr.Zero)
{
opengl32Handle = Functions.LoadLibrary(opengl32Name);
if (opengl32Handle == IntPtr.Zero)
{
throw new ApplicationException(String.Format("LoadLibrary(\"{0}\") call failed with code {1}",
opengl32Name, Marshal.GetLastWin32Error()));
}
Debug.WriteLine(String.Format("Loaded opengl32.dll: {0}", opengl32Handle));
}
// We need to create a temp context in order to load
// wgl extensions (e.g. for multisampling or GL3).
// We cannot rely on OpenTK.Platform.Wgl until we
// create the context and call Wgl.LoadAll().
Debug.Print("Creating temporary context for wgl extensions.");
using (INativeWindow native = new NativeWindow())
{
// Create temporary context and load WGL entry points
// First, set a compatible pixel format to the device context
// of the temp window
WinWindowInfo window = native.WindowInfo as WinWindowInfo;
WinGraphicsMode selector = new WinGraphicsMode(window.DeviceContext);
SetGraphicsModePFD(selector, GraphicsMode.Default, window);
// Then, construct a temporary context and load all wgl extensions
ContextHandle temp_context = new ContextHandle(Wgl.Imports.CreateContext(window.DeviceContext));
if (temp_context != ContextHandle.Zero)
{
// 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;
}
}
// Load wgl extensions and destroy temporary context
Wgl.LoadAll();
Wgl.Imports.MakeCurrent(IntPtr.Zero, IntPtr.Zero);
Wgl.Imports.DeleteContext(temp_context.Handle);
}
else
{
Debug.Print("wglCreateContext failed with error: {0}", Marshal.GetLastWin32Error());
}
}
}
}
static WinGLContext()
{
lock (LoadLock)
{
// Dynamically load opengl32.dll in order to use the extension loading capabilities of Wgl.
if (opengl32Handle == IntPtr.Zero)
{
opengl32Handle = Functions.LoadLibrary(opengl32Name);
if (opengl32Handle == IntPtr.Zero)
throw new ApplicationException(String.Format("LoadLibrary(\"{0}\") call failed with code {1}",
opengl32Name, Marshal.GetLastWin32Error()));
Debug.WriteLine(String.Format("Loaded opengl32.dll: {0}", opengl32Handle));
}
// We need to create a temp context in order to load
// wgl extensions (e.g. for multisampling or GL3).
// We cannot rely on OpenTK.Platform.Wgl until we
// create the context and call Wgl.LoadAll().
Debug.Print("Creating temporary context for wgl extensions.");
using (INativeWindow native = new NativeWindow())
{
// Create temporary context and load WGL entry points
// First, set a compatible pixel format to the device context
// of the temp window
WinWindowInfo window = native.WindowInfo as WinWindowInfo;
WinGraphicsMode selector = new WinGraphicsMode(window.DeviceContext);
SetGraphicsModePFD(selector, GraphicsMode.Default, window);
// Then, construct a temporary context and load all wgl extensions
ContextHandle temp_context = new ContextHandle(Wgl.Imports.CreateContext(window.DeviceContext));
if (temp_context != ContextHandle.Zero)
{
// 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;
}
}
// Load wgl extensions and destroy temporary context
Wgl.LoadAll();
Wgl.Imports.MakeCurrent(IntPtr.Zero, IntPtr.Zero);
Wgl.Imports.DeleteContext(temp_context.Handle);
}
else
{
Debug.Print("wglCreateContext failed with error: {0}", Marshal.GetLastWin32Error());
}
}
}
}
// Note: there is no relevant ARB function.
internal static GraphicsMode SetGraphicsModePFD(WinGraphicsMode mode_selector,
GraphicsMode mode, WinWindowInfo window)
{
Debug.Write("Setting pixel format... ");
if (window == null)
throw new ArgumentNullException("window", "Must point to a valid window.");
if (!mode.Index.HasValue)
{
mode = mode_selector.SelectGraphicsMode(
mode.ColorFormat, mode.Depth, mode.Stencil,
mode.Samples, mode.AccumulatorFormat,
mode.Buffers, mode.Stereo);
}
PixelFormatDescriptor pfd = new PixelFormatDescriptor();
Functions.DescribePixelFormat(
window.DeviceContext, (int)mode.Index.Value,
API.PixelFormatDescriptorSize, ref pfd);
Debug.WriteLine(mode.Index.ToString());
if (!Functions.SetPixelFormat(window.DeviceContext, (int)mode.Index.Value, ref pfd))
{
throw new GraphicsContextException(String.Format(
"Requested GraphicsMode not available. SetPixelFormat error: {0}",
Marshal.GetLastWin32Error()));
}
return mode;
}
public WinGLContext(GraphicsMode format, WinWindowInfo window, IGraphicsContext sharedContext,
int major, int minor, GraphicsContextFlags flags)
{
// There are many ways this code can break when accessed by multiple threads. The biggest offender is
// the sharedContext stuff, which will only become valid *after* this constructor returns.
// The easiest solution is to serialize all context construction - hence the big lock, below.
lock (SyncRoot)
{
if (window == null)
throw new ArgumentNullException("window", "Must point to a valid window.");
if (window.Handle == IntPtr.Zero)
throw new ArgumentException("window", "Must be a valid window.");
Debug.Print("OpenGL will be bound to window:{0} on thread:{1}", window.Handle,
System.Threading.Thread.CurrentThread.ManagedThreadId);
lock (LoadLock)
{
ModeSelector = new WinGraphicsMode(window.DeviceContext);
Mode = SetGraphicsModePFD(ModeSelector, format, (WinWindowInfo)window);
if (Wgl.Delegates.wglCreateContextAttribsARB != null)
{
try
{
Debug.Write("Using WGL_ARB_create_context... ");
List<int> attributes = new List<int>();
attributes.Add((int)ArbCreateContext.MajorVersion);
attributes.Add(major);
attributes.Add((int)ArbCreateContext.MinorVersion);
attributes.Add(minor);
if (flags != 0)
{
attributes.Add((int)ArbCreateContext.ContextFlags);
attributes.Add((int)GetARBContextFlags(flags));
attributes.Add((int)ArbCreateContext.ProfileMask);
attributes.Add((int)GetARBContextProfile(flags));
}
// According to the docs, " <attribList> specifies a list of attributes for the context.
// The list consists of a sequence of <name,value> pairs terminated by the
// value 0. [...]"
// Is this a single 0, or a <0, 0> pair? (Defensive coding: add two zeroes just in case).
attributes.Add(0);
attributes.Add(0);
Handle = new ContextHandle(
Wgl.Arb.CreateContextAttribs(
window.DeviceContext,
sharedContext != null ? (sharedContext as IGraphicsContextInternal).Context.Handle : IntPtr.Zero,
attributes.ToArray()));
if (Handle == ContextHandle.Zero)
Debug.Print("failed. (Error: {0})", Marshal.GetLastWin32Error());
}
catch (EntryPointNotFoundException e) { Debug.Print(e.ToString()); }
catch (NullReferenceException e) { Debug.Print(e.ToString()); }
}
}
if (Handle == ContextHandle.Zero)
{
// Failed to create GL3-level context, fall back to GL2.
Debug.Write("Falling back to GL2... ");
Handle = new ContextHandle(Wgl.Imports.CreateContext(window.DeviceContext));
if (Handle == ContextHandle.Zero)
Handle = new ContextHandle(Wgl.Imports.CreateContext(window.DeviceContext));
if (Handle == ContextHandle.Zero)
throw new GraphicsContextException(
String.Format("Context creation failed. Wgl.CreateContext() error: {0}.",
Marshal.GetLastWin32Error()));
}
Debug.WriteLine(String.Format("success! (id: {0})", Handle));
// Todo: is this comment still true?
// On intel drivers, wgl entry points appear to change
// when creating multiple contexts. As a workaround,
// we reload Wgl entry points every time we create a
// new context - this solves the issue without any apparent
// side-effects (i.e. the old contexts can still be handled
// using the new entry points.)
// Sigh...
Wgl.LoadAll();
if (sharedContext != null)
{
Marshal.GetLastWin32Error();
Debug.Write(String.Format("Sharing state with context {0}: ", sharedContext));
bool result = Wgl.Imports.ShareLists((sharedContext as IGraphicsContextInternal).Context.Handle, Handle.Handle);
Debug.WriteLine(result ? "success!" : "failed with win32 error " + Marshal.GetLastWin32Error());
}
}
}
