mirror of
https://github.com/Ryujinx/Opentk.git
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435 lines
14 KiB
C#
435 lines
14 KiB
C#
#region --- License ---
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/* Copyright (c) 2006, 2007 Stefanos Apostolopoulos
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* Contributions from Erik Ylvisaker
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* See license.txt for license info
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*/
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#endregion
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#region --- Using Directives ---
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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.Runtime.InteropServices;
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using System.Diagnostics;
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using OpenTK.Graphics.OpenGL;
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using OpenTK.Graphics;
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#endregion
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namespace OpenTK.Platform.Windows
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{
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/// <summary>
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/// Provides methods to create and control an opengl context on the Windows platform.
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/// This class supports OpenTK, and is not intended for use by OpenTK programs.
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/// </summary>
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internal sealed class WinGLContext : IGraphicsContext, IGraphicsContextInternal//, IGLContextCreationHack
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{
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ContextHandle renderContext;
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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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GraphicsMode format;
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//DisplayMode mode = null;
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bool vsync_supported;
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bool disposed;
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#region --- Contructors ---
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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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{
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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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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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this.format = 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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{
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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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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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attributes.Add((int)flags);
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}
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attributes.Add(0);
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renderContext = 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 (renderContext == 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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if (renderContext == 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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renderContext = new ContextHandle(Wgl.Imports.CreateContext(window.DeviceContext));
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if (renderContext == ContextHandle.Zero)
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renderContext = new ContextHandle(Wgl.Imports.CreateContext(window.DeviceContext));
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if (renderContext == 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})", renderContext));
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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, renderContext.Handle);
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}
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}
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#endregion
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#region --- IGraphicsContext Members ---
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#region public void SwapBuffers()
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public void SwapBuffers()
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{
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if (!Functions.SwapBuffers(Wgl.GetCurrentDC()))
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throw new GraphicsContextException(String.Format(
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"Failed to swap buffers for context {0} current. Error: {1}", this, Marshal.GetLastWin32Error()));
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}
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#endregion
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#region public void MakeCurrent(IWindowInfo window)
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public void MakeCurrent(IWindowInfo window)
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{
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bool success;
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if (window != null)
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{
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if (((WinWindowInfo)window).WindowHandle == IntPtr.Zero)
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throw new ArgumentException("window", "Must point to a valid window.");
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success = Wgl.Imports.MakeCurrent(((WinWindowInfo)window).DeviceContext, this.renderContext.Handle);
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}
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else
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success = Wgl.Imports.MakeCurrent(IntPtr.Zero, IntPtr.Zero);
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if (!success)
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throw new GraphicsContextException(String.Format(
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"Failed to make context {0} current. Error: {1}", this, Marshal.GetLastWin32Error()));
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}
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#endregion
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#region public bool IsCurrent
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public bool IsCurrent
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{
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get { return Wgl.GetCurrentContext() == this.renderContext.Handle; }
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/*
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set
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{
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if (value)
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Wgl.MakeCurrent(this.deviceContext, this.renderContext);
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else
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Wgl.MakeCurrent(IntPtr.Zero, IntPtr.Zero);
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}
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*/
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}
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#endregion
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#region public bool VSync
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/// <summary>
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/// Gets or sets a System.Boolean indicating whether SwapBuffer calls are synced to the screen refresh rate.
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/// </summary>
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public bool VSync
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{
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get
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{
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return vsync_supported && Wgl.Ext.GetSwapInterval() != 0;
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}
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set
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{
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if (vsync_supported)
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Wgl.Ext.SwapInterval(value ? 1 : 0);
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}
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}
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#endregion
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#region public void Update
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public void Update(IWindowInfo window)
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{
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}
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#endregion
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#region GraphicsMode IGLContext.GraphicsMode
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GraphicsMode IGraphicsContext.GraphicsMode
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{
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get { return format; }
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}
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#endregion
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public bool ErrorChecking
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{
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get { throw new NotImplementedException(); }
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set { throw new NotImplementedException(); }
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}
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[Obsolete]
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public event DestroyEvent<IGraphicsContext> Destroy;
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#endregion
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#region --- IGLContextInternal Members ---
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#region Implementation
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IGraphicsContext IGraphicsContextInternal.Implementation
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{
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get { return this; }
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}
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#endregion
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#region void LoadAll()
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void IGraphicsContextInternal.LoadAll()
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{
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Wgl.LoadAll();
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GL.LoadAll();
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Glu.LoadAll();
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vsync_supported = Wgl.Arb.SupportsExtension(this, "WGL_EXT_swap_control") &&
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Wgl.Load("wglGetSwapIntervalEXT") && Wgl.Load("wglSwapIntervalEXT");
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}
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#endregion
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#region ContextHandle IGLContextInternal.Context
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ContextHandle IGraphicsContextInternal.Context
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{
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get { return renderContext; }
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}
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#endregion
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#region IWindowInfo IGLContextInternal.Info
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/*
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IWindowInfo IGraphicsContextInternal.Info
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{
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get { return (IWindowInfo)windowInfo; }
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}
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*/
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#endregion
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#region public IntPtr GetAddress(string function_string)
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public IntPtr GetAddress(string function_string)
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{
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return Wgl.Imports.GetProcAddress(function_string);
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}
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#endregion
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#region void IGLContextInternal.RegisterForDisposal(IDisposable resource)
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void IGraphicsContextInternal.RegisterForDisposal(IDisposable resource)
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{
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throw new NotSupportedException("Use OpenTK.GraphicsContext instead.");
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}
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#endregion
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#region void IGLContextInternal.DisposeResources()
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void IGraphicsContextInternal.DisposeResources()
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{
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throw new NotSupportedException("Use OpenTK.GraphicsContext instead.");
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}
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#endregion
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#endregion
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#region --- Private Methods ---
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#region void SetGraphicsModePFD(GraphicsMode format, WinWindowInfo window)
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void SetGraphicsModePFD(GraphicsMode mode, WinWindowInfo window)
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{
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if (mode.Index == IntPtr.Zero) throw new ArgumentException(
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"mode", "The Index (pixel format) of the GraphicsMode is not set.");
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if (window == null) throw new ArgumentNullException("window", "Must point to a valid window.");
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PixelFormatDescriptor pfd = new PixelFormatDescriptor();
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Functions.DescribePixelFormat(window.DeviceContext, (int)mode.Index,
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API.PixelFormatDescriptorSize, ref pfd);
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Debug.WriteLine(mode.Index.ToString());
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if (!Functions.SetPixelFormat(window.DeviceContext, (int)mode.Index, ref pfd))
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throw new GraphicsContextException(String.Format(
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"Requested GraphicsMode not available. SetPixelFormat error: {0}", Marshal.GetLastWin32Error()));
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}
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#endregion
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#region void SetGraphicsModeARB(GraphicsMode format, IWindowInfo window)
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void SetGraphicsModeARB(GraphicsMode format, IWindowInfo window)
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{
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throw new NotImplementedException();
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}
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#endregion
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#endregion
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#region --- Internal Methods ---
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#region internal IntPtr DeviceContext
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internal IntPtr DeviceContext
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{
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get
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{
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return Wgl.GetCurrentDC();
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}
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}
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#endregion
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#endregion
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#region --- Overrides ---
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/// <summary>Returns a System.String describing this OpenGL context.</summary>
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/// <returns>A System.String describing this OpenGL context.</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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#endregion
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#region --- IDisposable Members ---
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public void Dispose()
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{
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Dispose(true);
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GC.SuppressFinalize(this);
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}
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private void Dispose(bool calledManually)
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{
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if (!disposed)
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{
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if (calledManually)
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{
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DestroyContext();
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}
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else
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{
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Debug.Print("[Warning] OpenGL context {0} leaked. Did you forget to call IGraphicsContext.Dispose()?",
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renderContext.Handle);
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}
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disposed = true;
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}
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}
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~WinGLContext()
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{
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Dispose(false);
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}
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#region private void DestroyContext()
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private void DestroyContext()
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{
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if (Destroy != null)
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Destroy(this, EventArgs.Empty);
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if (renderContext != ContextHandle.Zero)
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{
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try
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{
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// This will fail if the user calls Dispose() on thread X when the context is current on thread Y.
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if (!Wgl.Imports.DeleteContext(renderContext.Handle))
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Debug.Print("Failed to destroy OpenGL context {0}. Error: {1}",
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renderContext.ToString(), Marshal.GetLastWin32Error());
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}
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catch (AccessViolationException e)
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{
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Debug.WriteLine("An access violation occured while destroying the OpenGL context. Please report at http://www.opentk.com.");
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Debug.Indent();
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Debug.Print("Marshal.GetLastWin32Error(): {0}", Marshal.GetLastWin32Error().ToString());
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Debug.WriteLine(e.ToString());
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Debug.Unindent();
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}
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renderContext = ContextHandle.Zero;
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}
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}
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#endregion
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#endregion
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}
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}
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