mirror of
https://github.com/Ryujinx/Opentk.git
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Serialize context construction to avoid threading issues with shared contexts.
This commit is contained in:
the_fiddler
parent
40940d1430
commit
2ba3e5357e
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@ -32,7 +32,7 @@ namespace OpenTK.Graphics
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static bool share_contexts = true;
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static bool direct_rendering = true;
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readonly static object context_lock = new object();
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readonly static object SyncRoot = new object();
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// Maps OS-specific context handles to GraphicsContext weak references.
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readonly static Dictionary<ContextHandle, WeakReference> available_contexts = new Dictionary<ContextHandle, WeakReference>();
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@ -50,7 +50,7 @@ namespace OpenTK.Graphics
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{
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implementation = new OpenTK.Platform.Dummy.DummyGLContext(handle);
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lock (context_lock)
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lock (SyncRoot)
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{
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available_contexts.Add((implementation as IGraphicsContextInternal).Context, new WeakReference(this));
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}
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@ -78,31 +78,31 @@ namespace OpenTK.Graphics
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/// </remarks>
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public GraphicsContext(GraphicsMode mode, IWindowInfo window, int major, int minor, GraphicsContextFlags flags)
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{
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bool designMode = false;
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if (mode == null && window == null)
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designMode = true;
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else if (mode == null) throw new ArgumentNullException("mode", "Must be a valid GraphicsMode.");
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else if (window == null) throw new ArgumentNullException("window", "Must point to a valid window.");
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// Silently ignore invalid major and minor versions.
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if (major <= 0)
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major = 1;
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if (minor < 0)
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minor = 0;
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Debug.Print("Creating GraphicsContext.");
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try
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lock (SyncRoot)
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{
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Debug.Indent();
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Debug.Print("GraphicsMode: {0}", mode);
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Debug.Print("IWindowInfo: {0}", window);
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Debug.Print("GraphicsContextFlags: {0}", flags);
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Debug.Print("Requested version: {0}.{1}", major, minor);
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bool designMode = false;
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if (mode == null && window == null)
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designMode = true;
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else if (mode == null) throw new ArgumentNullException("mode", "Must be a valid GraphicsMode.");
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else if (window == null) throw new ArgumentNullException("window", "Must point to a valid window.");
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IGraphicsContext shareContext = null;
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if (GraphicsContext.ShareContexts)
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// Silently ignore invalid major and minor versions.
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if (major <= 0)
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major = 1;
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if (minor < 0)
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minor = 0;
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Debug.Print("Creating GraphicsContext.");
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try
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{
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lock (context_lock)
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Debug.Indent();
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Debug.Print("GraphicsMode: {0}", mode);
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Debug.Print("IWindowInfo: {0}", window);
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Debug.Print("GraphicsContextFlags: {0}", flags);
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Debug.Print("Requested version: {0}.{1}", major, minor);
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IGraphicsContext shareContext = null;
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if (GraphicsContext.ShareContexts)
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{
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// A small hack to create a shared context with the first available context.
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foreach (WeakReference r in GraphicsContext.available_contexts.Values)
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@ -111,26 +111,23 @@ namespace OpenTK.Graphics
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break;
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}
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}
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}
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// Todo: Add a DummyFactory implementing IPlatformFactory.
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if (designMode)
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implementation = new Platform.Dummy.DummyGLContext();
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else
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switch ((flags & GraphicsContextFlags.Embedded) == GraphicsContextFlags.Embedded)
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{
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case false: implementation = Factory.Default.CreateGLContext(mode, window, shareContext, direct_rendering, major, minor, flags); break;
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case true: implementation = Factory.Embedded.CreateGLContext(mode, window, shareContext, direct_rendering, major, minor, flags); break;
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}
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// Todo: Add a DummyFactory implementing IPlatformFactory.
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if (designMode)
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implementation = new Platform.Dummy.DummyGLContext();
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else
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switch ((flags & GraphicsContextFlags.Embedded) == GraphicsContextFlags.Embedded)
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{
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case false: implementation = Factory.Default.CreateGLContext(mode, window, shareContext, direct_rendering, major, minor, flags); break;
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case true: implementation = Factory.Embedded.CreateGLContext(mode, window, shareContext, direct_rendering, major, minor, flags); break;
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}
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lock (context_lock)
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{
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available_contexts.Add((this as IGraphicsContextInternal).Context, new WeakReference(this));
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}
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}
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finally
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{
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Debug.Unindent();
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finally
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{
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Debug.Unindent();
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}
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}
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}
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@ -201,7 +198,7 @@ namespace OpenTK.Graphics
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{
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get
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{
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lock (context_lock)
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lock (SyncRoot)
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{
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if (available_contexts.Count > 0)
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{
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@ -282,7 +279,7 @@ namespace OpenTK.Graphics
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/// </remarks>
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void CreateContext(bool direct, IGraphicsContext source)
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{
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lock (context_lock)
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lock (SyncRoot)
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{
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available_contexts.Add((this as IGraphicsContextInternal).Context, new WeakReference(this));
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}
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@ -418,7 +415,7 @@ namespace OpenTK.Graphics
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if (!IsDisposed)
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{
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Debug.Print("Disposing context {0}.", (this as IGraphicsContextInternal).Context.ToString());
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lock (context_lock)
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lock (SyncRoot)
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{
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available_contexts.Remove((this as IGraphicsContextInternal).Context);
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}
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@ -26,6 +26,8 @@ namespace OpenTK.Platform.Windows
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/// </summary>
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internal sealed class WinGLContext : DesktopGraphicsContext
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{
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static object SyncRoot = new object();
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static IntPtr opengl32Handle;
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static bool wgl_loaded;
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const string opengl32Name = "OPENGL32.DLL";
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@ -36,96 +38,106 @@ namespace OpenTK.Platform.Windows
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static WinGLContext()
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{
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// Dynamically load the OpenGL32.dll in order to use the extension loading capabilities of Wgl.
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if (opengl32Handle == IntPtr.Zero)
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lock (SyncRoot)
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{
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opengl32Handle = Functions.LoadLibrary(opengl32Name);
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// Dynamically load the OpenGL32.dll in order to use the extension loading capabilities of Wgl.
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if (opengl32Handle == IntPtr.Zero)
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throw new ApplicationException(String.Format("LoadLibrary(\"{0}\") call failed with code {1}",
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opengl32Name, Marshal.GetLastWin32Error()));
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Debug.WriteLine(String.Format("Loaded opengl32.dll: {0}", opengl32Handle));
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{
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opengl32Handle = Functions.LoadLibrary(opengl32Name);
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if (opengl32Handle == IntPtr.Zero)
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throw new ApplicationException(String.Format("LoadLibrary(\"{0}\") call failed with code {1}",
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opengl32Name, Marshal.GetLastWin32Error()));
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Debug.WriteLine(String.Format("Loaded opengl32.dll: {0}", opengl32Handle));
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}
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}
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}
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public WinGLContext(GraphicsMode format, WinWindowInfo window, IGraphicsContext sharedContext,
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int major, int minor, GraphicsContextFlags flags)
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{
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if (window == null)
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throw new ArgumentNullException("window", "Must point to a valid window.");
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if (window.WindowHandle == IntPtr.Zero)
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throw new ArgumentException("window", "Must be a valid window.");
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Mode = format;
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Debug.Print("OpenGL will be bound to handle: {0}", window.WindowHandle);
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Debug.Write("Setting pixel format... ");
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this.SetGraphicsModePFD(format, (WinWindowInfo)window);
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if (!wgl_loaded)
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// There are many ways this code can break when accessed by multiple threads. The biggest offender is
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// the sharedContext stuff, which will only become valid *after* this constructor returns.
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// The easiest solution is to serialize all context construction - hence the big lock, below.
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lock (SyncRoot)
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{
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// We need to create a temp context in order to load wgl extensions (e.g. for multisampling or GL3).
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// We cannot rely on OpenTK.Platform.Wgl until we create the context and call Wgl.LoadAll().
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Debug.Print("Creating temporary context for wgl extensions.");
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if (window == null)
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throw new ArgumentNullException("window", "Must point to a valid window.");
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if (window.WindowHandle == IntPtr.Zero)
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throw new ArgumentException("window", "Must be a valid window.");
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ContextHandle temp_context = new ContextHandle(Wgl.Imports.CreateContext(window.DeviceContext));
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Wgl.Imports.MakeCurrent(window.DeviceContext, temp_context.Handle);
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Wgl.LoadAll();
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Wgl.MakeCurrent(IntPtr.Zero, IntPtr.Zero);
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Wgl.DeleteContext(temp_context.Handle);
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wgl_loaded = true;
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}
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Mode = format;
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if (Wgl.Delegates.wglCreateContextAttribsARB != null)
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{
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try
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Debug.Print("OpenGL will be bound to handle: {0}", window.WindowHandle);
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Debug.Write("Setting pixel format... ");
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this.SetGraphicsModePFD(format, (WinWindowInfo)window);
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if (!wgl_loaded)
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{
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Debug.Write("Using WGL_ARB_create_context... ");
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// We need to create a temp context in order to load wgl extensions (e.g. for multisampling or GL3).
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// We cannot rely on OpenTK.Platform.Wgl until we create the context and call Wgl.LoadAll().
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Debug.Print("Creating temporary context for wgl extensions.");
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List<int> attributes = new List<int>();
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attributes.Add((int)ArbCreateContext.MajorVersion);
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attributes.Add(major);
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attributes.Add((int)ArbCreateContext.MinorVersion);
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attributes.Add(minor);
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if (flags != 0)
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{
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attributes.Add((int)ArbCreateContext.Flags);
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attributes.Add((int)flags);
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}
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attributes.Add(0);
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Handle = new ContextHandle(
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Wgl.Arb.CreateContextAttribs(
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window.DeviceContext,
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sharedContext != null ? (sharedContext as IGraphicsContextInternal).Context.Handle : IntPtr.Zero,
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attributes.ToArray()));
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if (Handle == ContextHandle.Zero)
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Debug.Print("failed. (Error: {0})", Marshal.GetLastWin32Error());
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else
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Debug.Print("success!");
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ContextHandle temp_context = new ContextHandle(Wgl.Imports.CreateContext(window.DeviceContext));
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Wgl.Imports.MakeCurrent(window.DeviceContext, temp_context.Handle);
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Wgl.LoadAll();
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Wgl.MakeCurrent(IntPtr.Zero, IntPtr.Zero);
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Wgl.DeleteContext(temp_context.Handle);
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wgl_loaded = true;
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}
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if (Wgl.Delegates.wglCreateContextAttribsARB != null)
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{
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try
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{
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Debug.Write("Using WGL_ARB_create_context... ");
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List<int> attributes = new List<int>();
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attributes.Add((int)ArbCreateContext.MajorVersion);
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attributes.Add(major);
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attributes.Add((int)ArbCreateContext.MinorVersion);
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attributes.Add(minor);
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if (flags != 0)
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{
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attributes.Add((int)ArbCreateContext.Flags);
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#warning "This is not entirely correct: Embedded is not a valid flag! We need to add a GetARBContextFlags(GraphicsContextFlags) method."
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attributes.Add((int)flags);
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}
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attributes.Add(0);
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Handle = new ContextHandle(
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Wgl.Arb.CreateContextAttribs(
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window.DeviceContext,
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sharedContext != null ? (sharedContext as IGraphicsContextInternal).Context.Handle : IntPtr.Zero,
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attributes.ToArray()));
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if (Handle == ContextHandle.Zero)
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Debug.Print("failed. (Error: {0})", Marshal.GetLastWin32Error());
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else
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Debug.Print("success!");
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}
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catch (EntryPointNotFoundException e) { Debug.Print(e.ToString()); }
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catch (NullReferenceException e) { Debug.Print(e.ToString()); }
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}
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catch (EntryPointNotFoundException e) { Debug.Print(e.ToString()); }
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catch (NullReferenceException e) { Debug.Print(e.ToString()); }
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}
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if (Handle == ContextHandle.Zero)
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{
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// Failed to create GL3-level context, fall back to GL2.
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Debug.Write("Falling back to GL2... ");
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Handle = new ContextHandle(Wgl.Imports.CreateContext(window.DeviceContext));
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if (Handle == ContextHandle.Zero)
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{
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// Failed to create GL3-level context, fall back to GL2.
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Debug.Write("Falling back to GL2... ");
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Handle = new ContextHandle(Wgl.Imports.CreateContext(window.DeviceContext));
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if (Handle == ContextHandle.Zero)
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throw new GraphicsContextException(
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String.Format("Context creation failed. Wgl.CreateContext() error: {0}.",
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Marshal.GetLastWin32Error()));
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}
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if (Handle == ContextHandle.Zero)
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Handle = new ContextHandle(Wgl.Imports.CreateContext(window.DeviceContext));
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if (Handle == ContextHandle.Zero)
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throw new GraphicsContextException(
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String.Format("Context creation failed. Wgl.CreateContext() error: {0}.",
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Marshal.GetLastWin32Error()));
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}
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Debug.WriteLine(String.Format("success! (id: {0})", Handle));
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Debug.WriteLine(String.Format("success! (id: {0})", Handle));
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if (sharedContext != null)
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{
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Debug.Print("Sharing state with context {0}", sharedContext.ToString());
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Wgl.Imports.ShareLists((sharedContext as IGraphicsContextInternal).Context.Handle, Handle.Handle);
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if (sharedContext != null)
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{
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Debug.Print("Sharing state with context {0}", sharedContext.ToString());
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Wgl.Imports.ShareLists((sharedContext as IGraphicsContextInternal).Context.Handle, Handle.Handle);
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}
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}
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}
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