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676 lines
28 KiB
C#
676 lines
28 KiB
C#
#region License
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//
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// The Open Toolkit Library License
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//
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// Copyright (c) 2006 - 2013 Stefanos Apostolopoulos
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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// the Software, and to permit persons to whom the Software is furnished to do
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// so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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//
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#endregion
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Diagnostics;
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using OpenTK.Platform;
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namespace OpenTK.Graphics
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{
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/// <summary>
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/// Represents and provides methods to manipulate an OpenGL render context.
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/// </summary>
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public sealed class GraphicsContext : IGraphicsContext, IGraphicsContextInternal
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{
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/// <summary>
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/// Used to retrive function pointers by name.
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/// </summary>
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/// <param name="function">The function name.</param>
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/// <returns>A function pointer to <paramref name="function"/>, or <c>IntPtr.Zero</c></returns>
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public delegate IntPtr GetAddressDelegate(string function);
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/// <summary>
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/// Used to return the handel of the current OpenGL context.
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/// </summary>
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/// <returns>The current OpenGL context, or <c>IntPtr.Zero</c> if no context is on the calling thread.</returns>
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public delegate ContextHandle GetCurrentContextDelegate();
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#region --- Fields ---
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IGraphicsContext implementation; // The actual render context implementation for the underlying platform.
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bool disposed;
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bool check_errors = true;
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// Cache for the context handle. We need this for RemoveContext()
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// in case the user does not call Dispose(). When this happens,
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// RemoveContext() is called by the finalizer, in which case
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// the IGraphicsContext implementation may already be null
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// (hence we cannot call implementation.Context to retrieve
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// the handle.)
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ContextHandle handle_cached;
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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 SyncRoot = new object();
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// Maps OS-specific context handles to GraphicsContext instances.
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readonly static Dictionary<ContextHandle, IGraphicsContext> available_contexts =
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new Dictionary<ContextHandle, IGraphicsContext>();
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#endregion
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#region --- Constructors ---
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/// <summary>
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/// Constructs a new GraphicsContext with the specified GraphicsMode and attaches it to the specified window.
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/// </summary>
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/// <param name="mode">The OpenTK.Graphics.GraphicsMode of the GraphicsContext.</param>
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/// <param name="window">The OpenTK.Platform.IWindowInfo to attach the GraphicsContext to.</param>
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public GraphicsContext(GraphicsMode mode, IWindowInfo window)
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: this(mode, window, 1, 0, GraphicsContextFlags.Default)
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{ }
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/// <summary>
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/// Constructs a new GraphicsContext with the specified GraphicsMode, version and flags, and attaches it to the specified window.
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/// </summary>
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/// <param name="mode">The OpenTK.Graphics.GraphicsMode of the GraphicsContext.</param>
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/// <param name="window">The OpenTK.Platform.IWindowInfo to attach the GraphicsContext to.</param>
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/// <param name="major">The major version of the new GraphicsContext.</param>
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/// <param name="minor">The minor version of the new GraphicsContext.</param>
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/// <param name="flags">The GraphicsContextFlags for the GraphicsContext.</param>
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/// <remarks>
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/// Different hardware supports different flags, major and minor versions. Invalid parameters will be silently ignored.
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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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lock (SyncRoot)
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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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{
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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 = shareContext = FindSharedContext();
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// Todo: Add a DummyFactory implementing IPlatformFactory.
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if (designMode)
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{
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implementation = new Platform.Dummy.DummyGLContext();
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}
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else
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{
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IPlatformFactory factory = null;
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switch ((flags & GraphicsContextFlags.Embedded) == GraphicsContextFlags.Embedded)
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{
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case false: factory = Factory.Default; break;
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case true: factory = Factory.Embedded; break;
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}
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// Note: this approach does not allow us to mix native and EGL contexts in the same process.
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// This should not be a problem, as this use-case is not interesting for regular applications.
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// Note 2: some platforms may not support a direct way of getting the current context
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// (this happens e.g. with DummyGLContext). In that case, we use a slow fallback which
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// iterates through all known contexts and checks if any is current (check GetCurrentContext
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// declaration).
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if (GetCurrentContext == null)
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{
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GetCurrentContext = factory.CreateGetCurrentGraphicsContext();
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}
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implementation = factory.CreateGLContext(mode, window, shareContext, direct_rendering, major, minor, flags);
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handle_cached = ((IGraphicsContextInternal)implementation).Context;
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}
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AddContext(this);
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}
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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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/// <summary>
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/// Initializes a new instance of the <see cref="OpenTK.Graphics.GraphicsContext"/> class using
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/// an external context handle that was created by a third-party library.
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/// </summary>
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/// <param name="handle">
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/// A valid, unique handle for an external OpenGL context, or <c>ContextHandle.Zero</c> to use the current context.
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/// It is an error to specify a handle that has been created through OpenTK or that has been passed to OpenTK before.
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/// </param>
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/// <param name="getAddress">
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/// A <c>GetAddressDelegate</c> instance that accepts the name of an OpenGL function and returns
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/// a valid function pointer, or <c>IntPtr.Zero</c> if that function is not supported. This delegate should be
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/// implemented using the same toolkit that created the OpenGL context (i.e. if the context was created with
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/// SDL_GL_CreateContext(), then this delegate should use SDL_GL_GetProcAddress() to retrieve function
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/// pointers.)
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/// </param>
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/// <param name="getCurrent">
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/// A <c>GetCurrentContextDelegate</c> instance that returns the handle of the current OpenGL context,
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/// or <c>IntPtr.Zero</c> if no context is current on the calling thread. This delegate should be implemented
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/// using the same toolkit that created the OpenGL context (i.e. if the context was created with
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/// SDL_GL_CreateContext(), then this delegate should use SDL_GL_GetCurrentContext() to retrieve
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/// the current context.)
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/// </param>
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public GraphicsContext(ContextHandle handle, GetAddressDelegate getAddress, GetCurrentContextDelegate getCurrent)
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{
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if (getAddress == null || getCurrent == null)
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throw new ArgumentNullException();
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// Make sure OpenTK has been initialized.
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// Fixes https://github.com/opentk/opentk/issues/52
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Toolkit.Init();
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lock (SyncRoot)
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{
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// Replace a zero-handle by the current context, if any
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if (handle == ContextHandle.Zero)
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{
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handle = getCurrent();
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}
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// Make sure this handle corresponds to a valid, unique OpenGL context
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if (handle == ContextHandle.Zero)
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{
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throw new GraphicsContextMissingException();
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}
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else if (available_contexts.ContainsKey(handle))
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{
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throw new InvalidOperationException("Context handle has already been added");
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}
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// We have a valid handle for an external OpenGL context, wrap it into a
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// DummyGLContext instance.
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implementation = new Platform.Dummy.DummyGLContext(handle, getAddress);
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GetCurrentContext = getCurrent ?? GetCurrentContext;
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AddContext(this);
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}
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implementation.LoadAll();
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}
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/// <summary>
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/// Constructs a new GraphicsContext from a pre-existing context created outside of OpenTK.
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/// </summary>
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/// <param name="handle">The handle of the existing context. This must be a valid, unique handle that is not known to OpenTK.</param>
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/// <param name="window">This parameter is reserved.</param>
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public GraphicsContext(ContextHandle handle, IWindowInfo window)
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: this(handle, window, null, 1, 0, GraphicsContextFlags.Default)
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{ }
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/// <summary>
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/// Constructs a new GraphicsContext from a pre-existing context created outside of OpenTK.
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/// </summary>
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/// <param name="handle">The handle of the existing context. This must be a valid, unique handle that is not known to OpenTK.</param>
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/// <param name="window">This parameter is reserved.</param>
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/// <param name="shareContext">This parameter is reserved.</param>
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/// <param name="major">This parameter is reserved.</param>
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/// <param name="minor">This parameter is reserved.</param>
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/// <param name="flags">This parameter is reserved..</param>
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public GraphicsContext(ContextHandle handle, IWindowInfo window, IGraphicsContext shareContext, int major, int minor, GraphicsContextFlags flags)
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: this(handle, Platform.Utilities.CreateGetAddress(), Factory.Default.CreateGetCurrentGraphicsContext())
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{ }
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#endregion
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#region Public Members
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/// <summary>
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/// Returns a <see cref="System.String"/> representing this instance.
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/// </summary>
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/// <returns>A <see cref="System.String"/> that contains a string representation of this instance.</returns>
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public override string ToString()
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{
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return (this as IGraphicsContextInternal).Context.ToString();
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}
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/// <summary>
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/// Returns the hash code for this instance.
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/// </summary>
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/// <returns>A System.Int32 with the hash code of this instance.</returns>
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public override int GetHashCode()
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{
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return (this as IGraphicsContextInternal).Context.GetHashCode();
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}
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/// <summary>
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/// Compares two instances.
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/// </summary>
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/// <param name="obj">The instance to compare to.</param>
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/// <returns>True, if obj is equal to this instance; false otherwise.</returns>
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public override bool Equals(object obj)
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{
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return (obj is GraphicsContext) &&
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(this as IGraphicsContextInternal).Context == (obj as IGraphicsContextInternal).Context;
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}
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#endregion
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#region Private Members
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static void AddContext(IGraphicsContextInternal context)
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{
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ContextHandle ctx = context.Context;
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if (!available_contexts.ContainsKey(ctx))
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{
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available_contexts.Add(ctx, (IGraphicsContext)context);
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}
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else
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{
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Debug.Print("A GraphicsContext with handle {0} already exists.", ctx);
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Debug.Print("Did you forget to call Dispose()?");
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available_contexts[ctx] = (IGraphicsContext)context;
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}
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}
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static void RemoveContext(IGraphicsContextInternal context)
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{
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ContextHandle ctx = context.Context;
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if (available_contexts.ContainsKey(ctx))
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{
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available_contexts.Remove(ctx);
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}
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else
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{
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Debug.Print("Tried to remove non-existent GraphicsContext handle {0}. Call Dispose() to avoid this error.", ctx);
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}
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}
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static IGraphicsContext FindSharedContext()
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{
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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 (IGraphicsContext target in GraphicsContext.available_contexts.Values)
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{
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// Fix for bug 1874: if a GraphicsContext gets finalized
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// (but not disposed), it won't be removed from available_contexts
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// making this return null even if another valid context exists.
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// The workaround is to simply ignore null targets.
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if (target != null)
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return target;
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}
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}
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return null;
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}
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#endregion
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#region --- Static Members ---
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#region public static GraphicsContext CreateDummyContext()
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/// <summary>
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/// Creates a dummy GraphicsContext to allow OpenTK to work with contexts created by external libraries.
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/// </summary>
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/// <returns>A new, dummy GraphicsContext instance.</returns>
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/// <remarks>
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/// <para>Instances created by this method will not be functional. Instance methods will have no effect.</para>
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/// <para>This method requires that a context is current on the calling thread.</para>
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/// </remarks>
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[Obsolete("Use GraphicsContext(ContextHandle, IWindowInfo) constructor instead")]
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public static GraphicsContext CreateDummyContext()
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{
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ContextHandle handle = GetCurrentContext();
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if (handle == ContextHandle.Zero)
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throw new InvalidOperationException("No GraphicsContext is current on the calling thread.");
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return CreateDummyContext(handle);
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}
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/// <summary>
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/// Creates a dummy GraphicsContext to allow OpenTK to work with contexts created by external libraries.
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/// </summary>
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/// <param name="handle">The handle of a context.</param>
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/// <returns>A new, dummy GraphicsContext instance.</returns>
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/// <remarks>
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/// <para>Instances created by this method will not be functional. Instance methods will have no effect.</para>
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/// </remarks>
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[Obsolete("Use GraphicsContext(ContextHandle, IWindowInfo) constructor instead")]
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public static GraphicsContext CreateDummyContext(ContextHandle handle)
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{
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if (handle == ContextHandle.Zero)
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throw new ArgumentOutOfRangeException("handle");
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return new GraphicsContext(handle, (IWindowInfo)null);
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}
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#endregion
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#region public static void Assert()
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/// <summary>
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/// Checks if a GraphicsContext exists in the calling thread and throws a GraphicsContextMissingException if it doesn't.
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/// </summary>
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/// <exception cref="GraphicsContextMissingException">Generated when no GraphicsContext is current in the calling thread.</exception>
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public static void Assert()
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{
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if (GraphicsContext.CurrentContext == null)
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throw new GraphicsContextMissingException();
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}
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#endregion
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#region public static IGraphicsContext CurrentContext
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internal static GetCurrentContextDelegate GetCurrentContext;
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/// <summary>
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/// Gets the GraphicsContext that is current in the calling thread.
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/// </summary>
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/// <remarks>
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/// Note: this property will not function correctly when both desktop and EGL contexts are
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/// available in the same process. This scenario is very unlikely to appear in practice.
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/// </remarks>
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public static IGraphicsContext CurrentContext
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{
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get
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{
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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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ContextHandle handle = GetCurrentContext();
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if (handle.Handle != IntPtr.Zero)
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return (IGraphicsContext)available_contexts[handle];
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}
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return null;
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}
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}
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}
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#endregion
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#region public static bool ShareContexts
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/// <summary>Gets or sets a System.Boolean, indicating whether GraphicsContext resources are shared</summary>
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/// <remarks>
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/// <para>If ShareContexts is true, new GLContexts will share resources. If this value is
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/// false, new GLContexts will not share resources.</para>
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/// <para>Changing this value will not affect already created GLContexts.</para>
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/// </remarks>
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public static bool ShareContexts { get { return share_contexts; } set { share_contexts = value; } }
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#endregion
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#region public static bool DirectRendering
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/// <summary>Gets or sets a System.Boolean, indicating whether GraphicsContexts will perform direct rendering.</summary>
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/// <remarks>
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/// <para>
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/// If DirectRendering is true, new contexts will be constructed with direct rendering capabilities, if possible.
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/// If DirectRendering is false, new contexts will be constructed with indirect rendering capabilities.
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/// </para>
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/// <para>This property does not affect existing GraphicsContexts, unless they are recreated.</para>
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/// <para>
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/// This property is ignored on Operating Systems without support for indirect rendering, like Windows and OS X.
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/// </para>
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/// </remarks>
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public static bool DirectRendering
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{
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get { return direct_rendering; }
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set { direct_rendering = value; }
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}
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#endregion
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#endregion
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#region --- IGraphicsContext Members ---
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/// <summary>
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/// Gets or sets a System.Boolean, indicating whether automatic error checking should be performed.
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/// Influences the debug version of OpenTK.dll, only.
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/// </summary>
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/// <remarks>Automatic error checking will clear the OpenGL error state. Set CheckErrors to false if you use
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/// the OpenGL error state in your code flow (e.g. for checking supported texture formats).</remarks>
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public bool ErrorChecking
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{
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get { return check_errors; }
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set { check_errors = value; }
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}
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/// <summary>
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/// Swaps buffers on a context. This presents the rendered scene to the user.
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/// </summary>
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public void SwapBuffers()
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{
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implementation.SwapBuffers();
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}
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/// <summary>
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/// Makes the GraphicsContext the current rendering target.
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/// </summary>
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/// <param name="window">A valid <see cref="OpenTK.Platform.IWindowInfo" /> structure.</param>
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/// <remarks>
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/// You can use this method to bind the GraphicsContext to a different window than the one it was created from.
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/// </remarks>
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public void MakeCurrent(IWindowInfo window)
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{
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implementation.MakeCurrent(window);
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}
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/// <summary>
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/// Gets a <see cref="System.Boolean"/> indicating whether this instance is current in the calling thread.
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/// </summary>
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public bool IsCurrent
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{
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get { return implementation.IsCurrent; }
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}
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/// <summary>
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/// Gets a <see cref="System.Boolean"/> indicating whether this instance has been disposed.
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/// It is an error to access any instance methods if this property returns true.
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/// </summary>
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public bool IsDisposed
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{
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get { return disposed && implementation.IsDisposed; }
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private set { disposed = value; }
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}
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/// <summary>
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/// [obsolete] Use SwapInterval property instead.
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/// Gets or sets a value indicating whether VSync is enabled. When VSync is
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/// enabled, <see cref="SwapBuffers()"/> calls will be synced to the refresh
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/// rate of the <see cref="DisplayDevice"/> that contains improving visual
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/// quality and reducing CPU usage. However, systems that cannot maintain
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/// the requested rendering rate will suffer from large jumps in performance.
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/// This can be counteracted by increasing the <see cref="SwapInterval"/>
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/// value.
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/// </summary>
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|
[Obsolete("Use SwapInterval property instead.")]
|
|
public bool VSync
|
|
{
|
|
#pragma warning disable 0612, 0618 // CS0612/CS0618: 'member' is obsolete
|
|
get { return implementation.VSync; }
|
|
set { implementation.VSync = value; }
|
|
#pragma warning restore 0612, 0618
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets or sets a positive integer in the range [1, n), indicating the number of
|
|
/// <see cref="DisplayDevice"/> refreshes between consecutive
|
|
/// <see cref="SwapBuffers()"/> calls. The maximum value for n is
|
|
/// implementation-dependent. The default value is 1.
|
|
/// This value will only affect instances where <see cref="VSync"/> is enabled.
|
|
/// Invalid values will be clamped to the valid range.
|
|
/// </summary>
|
|
public int SwapInterval
|
|
{
|
|
get { return implementation.SwapInterval; }
|
|
set { implementation.SwapInterval = value; }
|
|
}
|
|
|
|
/// <summary>
|
|
/// Updates the graphics context. This must be called when the render target
|
|
/// is resized for proper behavior on Mac OS X.
|
|
/// </summary>
|
|
/// <param name="window"></param>
|
|
public void Update(IWindowInfo window)
|
|
{
|
|
implementation.Update(window);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Loads all OpenGL entry points.
|
|
/// </summary>
|
|
/// <exception cref="OpenTK.Graphics.GraphicsContextException">
|
|
/// Occurs when this instance is not current on the calling thread.
|
|
/// </exception>
|
|
public void LoadAll()
|
|
{
|
|
if (GraphicsContext.CurrentContext != this)
|
|
throw new GraphicsContextException();
|
|
|
|
implementation.LoadAll();
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region --- IGraphicsContextInternal Members ---
|
|
|
|
/// <summary>
|
|
/// Gets the platform-specific implementation of this IGraphicsContext.
|
|
/// </summary>
|
|
IGraphicsContext IGraphicsContextInternal.Implementation
|
|
{
|
|
get { return implementation; }
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets a handle to the OpenGL rendering context.
|
|
/// </summary>
|
|
ContextHandle IGraphicsContextInternal.Context
|
|
{
|
|
get
|
|
{
|
|
if (implementation != null)
|
|
{
|
|
handle_cached = ((IGraphicsContextInternal)implementation).Context;
|
|
}
|
|
return handle_cached;
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the GraphicsMode of the context.
|
|
/// </summary>
|
|
public GraphicsMode GraphicsMode
|
|
{
|
|
get { return (implementation as IGraphicsContext).GraphicsMode; }
|
|
}
|
|
|
|
/// <summary>
|
|
/// Retrieves the implementation-defined address of an OpenGL function.
|
|
/// </summary>
|
|
/// <param name="function">The name of the OpenGL function (e.g. "glGetString")</param>
|
|
/// <returns>
|
|
/// A pointer to the specified function or an invalid pointer if the function is not
|
|
/// available in the current OpenGL context. The return value and calling convention
|
|
/// depends on the underlying platform.
|
|
/// </returns>
|
|
IntPtr IGraphicsContextInternal.GetAddress(string function)
|
|
{
|
|
return (implementation as IGraphicsContextInternal).GetAddress(function);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Retrieves the implementation-defined address of an OpenGL function.
|
|
/// </summary>
|
|
/// <param name="function">
|
|
/// A pointer to a null-terminated buffer
|
|
/// containing the name of the OpenGL function.
|
|
/// </param>
|
|
/// <returns>
|
|
/// A pointer to the specified function or an invalid pointer if the function is not
|
|
/// available in the current OpenGL context. The return value and calling convention
|
|
/// depends on the underlying platform.
|
|
/// </returns>
|
|
IntPtr IGraphicsContextInternal.GetAddress(IntPtr function)
|
|
{
|
|
return (implementation as IGraphicsContextInternal).GetAddress(function);
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region --- IDisposable Members ---
|
|
|
|
/// <summary>
|
|
/// Disposes of the GraphicsContext.
|
|
/// </summary>
|
|
public void Dispose()
|
|
{
|
|
this.Dispose(true);
|
|
GC.SuppressFinalize(this);
|
|
}
|
|
|
|
void Dispose(bool manual)
|
|
{
|
|
if (!IsDisposed)
|
|
{
|
|
lock (SyncRoot)
|
|
{
|
|
RemoveContext(this);
|
|
}
|
|
|
|
// Note: we cannot dispose the implementation
|
|
// from a different thread. See wglDeleteContext.
|
|
// This is also known to crash GLX implementations.
|
|
if (manual)
|
|
{
|
|
Debug.Print("Disposing context {0}.", (this as IGraphicsContextInternal).Context.ToString());
|
|
if (implementation != null)
|
|
implementation.Dispose();
|
|
}
|
|
else
|
|
{
|
|
Debug.WriteLine("GraphicsContext leaked, did you forget to call Dispose()?");
|
|
}
|
|
IsDisposed = true;
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Marks this context as deleted, but does not actually release unmanaged resources
|
|
/// due to the threading requirements of OpenGL. Use <see cref="GraphicsContext.Dispose()"/>
|
|
/// instead.
|
|
/// </summary>
|
|
~GraphicsContext()
|
|
{
|
|
Dispose(false);
|
|
}
|
|
|
|
#endregion
|
|
}
|
|
}
|