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X11GLContext.cs
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X11GLContext.cs
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#region --- License ---
/* Copyright (c) 2007 Stefanos Apostolopoulos
* See license.txt for license info
*/
#endregion
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Diagnostics;
using OpenTK.Graphics;
namespace OpenTK.Platform.X11
{
/// \internal
/// <summary>
/// Provides methods to create and control an opengl context on the X11 platform.
/// This class supports OpenTK, and is not intended for use by OpenTK programs.
/// </summary>
internal sealed class X11GLContext : DesktopGraphicsContext
{
#region Fields
// We assume that we cannot move a GL context to a different display connection.
// For this reason, we'll "lock" onto the display of the window used in the context
// constructor and we'll throw an exception if the user ever tries to make the context
// current on window originating from a different display.
IntPtr display;
X11WindowInfo currentWindow;
bool vsync_supported;
bool vsync_tear_supported;
int swap_interval = 1; // As defined in GLX_SGI_swap_control
readonly X11GraphicsMode ModeSelector = new X11GraphicsMode();
#endregion
#region --- Constructors ---
public X11GLContext(GraphicsMode mode, IWindowInfo window, IGraphicsContext shared, bool direct,
int major, int minor, GraphicsContextFlags flags)
{
if (mode == null)
throw new ArgumentNullException("mode");
if (window == null)
throw new ArgumentNullException("window");
Mode = ModeSelector.SelectGraphicsMode(
mode.ColorFormat, mode.Depth, mode.Stencil, mode.Samples,
mode.AccumulatorFormat, mode.Buffers, mode.Stereo);
// Do not move this lower, as almost everything requires the Display
// property to be correctly set.
Display = ((X11WindowInfo)window).Display;
currentWindow = (X11WindowInfo)window;
currentWindow.VisualInfo = SelectVisual(Mode, currentWindow);
ContextHandle shareHandle = shared != null ?
(shared as IGraphicsContextInternal).Context : (ContextHandle)IntPtr.Zero;
Debug.Write("Creating X11GLContext context: ");
Debug.Write(direct ? "direct, " : "indirect, ");
Debug.WriteLine(shareHandle.Handle == IntPtr.Zero ? "not shared... " :
String.Format("shared with ({0})... ", shareHandle));
// Try using the new context creation method. If it fails, fall back to the old one.
// For each of these methods, we try two times to create a context:
// one with the "direct" flag intact, the other with the flag inversed.
// HACK: It seems that Catalyst 9.1 - 9.4 on Linux have problems with contexts created through
// GLX_ARB_create_context, including hideous input lag, no vsync and other madness.
// Use legacy context creation if the user doesn't request a 3.0+ context.
if ((major * 10 + minor >= 30) && SupportsCreateContextAttribs(Display, currentWindow))
{
Debug.Write("Using GLX_ARB_create_context... ");
unsafe
{
// We need the FB config for the current GraphicsMode.
int count;
IntPtr* fbconfigs = Glx.ChooseFBConfig(Display, currentWindow.Screen,
new int[] {
(int)GLXAttribute.VISUAL_ID,
(int)Mode.Index,
0
}, out count);
if (count > 0)
{
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.Flags);
attributes.Add((int)GetARBContextFlags(flags));
attributes.Add((int)ArbCreateContext.ProfileMask);
attributes.Add((int)GetARBProfileFlags(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);
using (new XLock(Display))
{
Handle = new ContextHandle(Glx.Arb.CreateContextAttribs(Display, *fbconfigs,
shareHandle.Handle, direct, attributes.ToArray()));
if (Handle == ContextHandle.Zero)
{
Debug.Write(String.Format("failed. Trying direct: {0}... ", !direct));
Handle = new ContextHandle(Glx.Arb.CreateContextAttribs(Display, *fbconfigs,
shareHandle.Handle, !direct, attributes.ToArray()));
}
}
if (Handle == ContextHandle.Zero)
Debug.WriteLine("failed.");
else
Debug.WriteLine("success!");
using (new XLock(Display))
{
Functions.XFree((IntPtr)fbconfigs);
}
}
}
}
if (Handle == ContextHandle.Zero)
{
Debug.Write("Using legacy context creation... ");
XVisualInfo info = currentWindow.VisualInfo;
using (new XLock(Display))
{
// Cannot pass a Property by reference.
Handle = new ContextHandle(Glx.CreateContext(Display, ref info, shareHandle.Handle, direct));
if (Handle == ContextHandle.Zero)
{
Debug.WriteLine(String.Format("failed. Trying direct: {0}... ", !direct));
Handle = new ContextHandle(Glx.CreateContext(Display, ref info, IntPtr.Zero, !direct));
}
}
}
if (Handle != ContextHandle.Zero)
Debug.Print("Context created (id: {0}).", Handle);
else
throw new GraphicsContextException("Failed to create OpenGL context. Glx.CreateContext call returned 0.");
using (new XLock(Display))
{
if (!Glx.IsDirect(Display, Handle.Handle))
Debug.Print("Warning: Context is not direct.");
}
}
public X11GLContext(ContextHandle handle, IWindowInfo window, IGraphicsContext shared, bool direct,
int major, int minor, GraphicsContextFlags flags)
{
if (handle == ContextHandle.Zero)
throw new ArgumentException("handle");
if (window == null)
throw new ArgumentNullException("window");
Handle = handle;
currentWindow = (X11WindowInfo)window;
Display = currentWindow.Display;
}
#endregion
#region --- Private Methods ---
IntPtr Display
{
get { return display; }
set
{
if (value == IntPtr.Zero)
throw new ArgumentOutOfRangeException();
if (display != IntPtr.Zero)
throw new InvalidOperationException("The display connection may not be changed after being set.");
display = value;
}
}
#region XVisualInfo SelectVisual(GraphicsMode mode, X11WindowInfo currentWindow)
XVisualInfo SelectVisual(GraphicsMode mode, X11WindowInfo currentWindow)
{
XVisualInfo info = new XVisualInfo();
info.VisualID = (IntPtr)mode.Index;
info.Screen = currentWindow.Screen;
int items;
lock (API.Lock)
{
IntPtr vs = Functions.XGetVisualInfo(Display, XVisualInfoMask.ID | XVisualInfoMask.Screen, ref info, out items);
if (items == 0)
throw new GraphicsModeException(String.Format("Invalid GraphicsMode specified ({0}).", mode));
info = (XVisualInfo)Marshal.PtrToStructure(vs, typeof(XVisualInfo));
Functions.XFree(vs);
}
return info;
}
#endregion
ArbCreateContext GetARBContextFlags(GraphicsContextFlags flags)
{
ArbCreateContext result = 0;
result |= (flags & GraphicsContextFlags.Debug) != 0 ? ArbCreateContext.DebugBit : 0;
return result;
}
ArbCreateContext GetARBProfileFlags(GraphicsContextFlags flags)
{
ArbCreateContext result = 0;
result |= (flags & GraphicsContextFlags.ForwardCompatible) != 0 ?
ArbCreateContext.CoreProfileBit : ArbCreateContext.CompatibilityProfileBit;
return result;
}
static bool SupportsExtension(IntPtr display, X11WindowInfo window, string e)
{
if (window == null)
throw new ArgumentNullException("window");
if (e == null)
throw new ArgumentNullException("e");
if (window.Display != display)
throw new InvalidOperationException();
string extensions = null;
using (new XLock(display))
{
extensions = Glx.QueryExtensionsString(display, window.Screen);
}
return !String.IsNullOrEmpty(extensions) && extensions.Contains(e);
}
static bool SupportsCreateContextAttribs(IntPtr display, X11WindowInfo window)
{
return
SupportsExtension(display, window, "GLX_ARB_create_context") &&
SupportsExtension(display, window, "GLX_ARB_create_context_profile") &&
Glx.SupportsFunction("glXCreateContextAttribsARB");
}
#endregion
#region --- IGraphicsContext Members ---
#region SwapBuffers()
public override void SwapBuffers()
{
if (Display == IntPtr.Zero || currentWindow.Handle == IntPtr.Zero)
throw new InvalidOperationException(
String.Format("Window is invalid. Display ({0}), Handle ({1}).", Display, currentWindow.Handle));
using (new XLock(Display))
{
Glx.SwapBuffers(Display, currentWindow.Handle);
}
}
#endregion
#region MakeCurrent
public override void MakeCurrent(IWindowInfo window)
{
if (window == currentWindow && IsCurrent)
return;
if (window != null && ((X11WindowInfo)window).Display != Display)
throw new InvalidOperationException("MakeCurrent() may only be called on windows originating from the same display that spawned this GL context.");
if (window == null)
{
Debug.Write(String.Format("Releasing context {0} from thread {1} (Display: {2})... ",
Handle, System.Threading.Thread.CurrentThread.ManagedThreadId, Display));
bool result;
using (new XLock(Display))
{
result = Glx.MakeCurrent(Display, IntPtr.Zero, IntPtr.Zero);
if (result)
{
currentWindow = null;
}
}
Debug.Print("{0}", result ? "done!" : "failed.");
}
else
{
X11WindowInfo w = (X11WindowInfo)window;
bool result;
Debug.Write(String.Format("Making context {0} current on thread {1} (Display: {2}, Screen: {3}, Window: {4})... ",
Handle, System.Threading.Thread.CurrentThread.ManagedThreadId, Display, w.Screen, w.Handle));
if (Display == IntPtr.Zero || w.Handle == IntPtr.Zero || Handle == ContextHandle.Zero)
throw new InvalidOperationException("Invalid display, window or context.");
using (new XLock(Display))
{
result = Glx.MakeCurrent(Display, w.Handle, Handle);
if (result)
{
currentWindow = w;
}
}
if (!result)
throw new GraphicsContextException("Failed to make context current.");
else
Debug.WriteLine("done!");
}
currentWindow = (X11WindowInfo)window;
}
#endregion
#region IsCurrent
public override bool IsCurrent
{
get
{
using (new XLock(Display))
{
return Glx.GetCurrentContext() == Handle.Handle;
}
}
}
#endregion
#region SwapInterval
public override int SwapInterval
{
get
{
if (vsync_supported)
return swap_interval;
else
return 0;
}
set
{
if (vsync_supported)
{
if (value < 0 && !vsync_tear_supported)
{
value = 1;
}
ErrorCode error_code = 0;
using (new XLock(Display))
error_code = Glx.Sgi.SwapInterval(value);
if (error_code == X11.ErrorCode.NO_ERROR)
swap_interval = value;
else
Debug.Print("VSync = {0} failed, error code: {1}.", value, error_code);
}
}
}
#endregion
#region LoadAll
public override void LoadAll()
{
vsync_supported =
SupportsExtension(display, currentWindow, "GLX_SGI_swap_control") &&
Glx.SupportsFunction("glXSwapIntervalSGI");
vsync_tear_supported =
SupportsExtension(display, currentWindow, "GLX_EXT_swap_control_tear");
Debug.Print("Context supports vsync: {0}.", vsync_supported);
base.LoadAll();
}
#endregion
#endregion
#region --- IGraphicsContextInternal Members ---
#region GetAddress
public override IntPtr GetAddress(IntPtr function)
{
using (new XLock(Display))
{
return Glx.GetProcAddress(function);
}
}
#endregion
#endregion
#region --- IDisposable Members ---
public override void Dispose()
{
this.Dispose(true);
GC.SuppressFinalize(this);
}
private void Dispose(bool manuallyCalled)
{
if (!IsDisposed)
{
if (manuallyCalled)
{
IntPtr display = Display;
if (IsCurrent)
{
using (new XLock(display))
{
Glx.MakeCurrent(display, IntPtr.Zero, IntPtr.Zero);
}
}
using (new XLock(display))
{
Glx.DestroyContext(display, Handle);
}
}
}
else
{
Debug.Print("[Warning] {0} leaked.", this.GetType().Name);
}
IsDisposed = true;
}
~X11GLContext()
{
this.Dispose(false);
}
#endregion
}
}