Subversion Repositories AndroidProjects

#region License

//

// The Open Toolkit Library License

//

// Copyright (c) 2006 - 2009 the Open Toolkit library.

//

// Permission is hereby granted, free of charge, to any person obtaining a copy

// of this software and associated documentation files (the "Software"), to deal

// in the Software without restriction, including without limitation the rights to 

// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of

// the Software, and to permit persons to whom the Software is furnished to do

// so, subject to the following conditions:

//

// The above copyright notice and this permission notice shall be included in all

// copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES

// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT

// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,

// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

// OTHER DEALINGS IN THE SOFTWARE.

//

#endregion

using System;

using OpenTK.Graphics;

using System.Diagnostics;

using OpenTK.Platform.Windows;

namespace OpenTK.Platform.Egl

{

    class EglContext : EmbeddedGraphicsContext

    {

        #region Fields

        EglWindowInfo WindowInfo;

        IntPtr HandleAsEGLContext { get { return Handle.Handle; } set { Handle = new ContextHandle(value); } }

        bool vsync = true;   // Default vsync value is defined as 1 (true) in EGL.

        #endregion

        #region Constructors

        public EglContext(GraphicsMode mode, EglWindowInfo window, IGraphicsContext sharedContext,

            int major, int minor, GraphicsContextFlags flags)

        {

            if (mode == null)

                throw new ArgumentNullException("mode");

            if (window == null)

                throw new ArgumentNullException("window");

            EglContext shared = (EglContext)sharedContext;

            int dummy_major, dummy_minor;

            if (!Egl.Initialize(window.Display, out dummy_major, out dummy_minor))

                throw new GraphicsContextException(String.Format("Failed to initialize EGL, error {0}.", Egl.GetError()));

            WindowInfo = window;

            Mode = new EglGraphicsMode().SelectGraphicsMode(mode.ColorFormat, mode.Depth, mode.Stencil, mode.Samples, mode.AccumulatorFormat, mode.Buffers, mode.Stereo);

            if (!Mode.Index.HasValue)

                throw new GraphicsModeException("Invalid or unsupported GraphicsMode.");

            IntPtr config = Mode.Index.Value;

            if (window.Surface == IntPtr.Zero)

                window.CreateWindowSurface(config);

            int[] attrib_list = new int[] { Egl.CONTEXT_CLIENT_VERSION, major, Egl.NONE };

            HandleAsEGLContext = Egl.CreateContext(window.Display, config, shared != null ? shared.HandleAsEGLContext : IntPtr.Zero, attrib_list);

            MakeCurrent(window);

        }

        public EglContext(ContextHandle handle, EglWindowInfo window, IGraphicsContext sharedContext,

            int major, int minor, GraphicsContextFlags flags)

        {

            if (handle == ContextHandle.Zero)

                throw new ArgumentException("handle");

            if (window == null)

                throw new ArgumentNullException("window");

            Handle = handle;

        }

        #endregion

        #region IGraphicsContext Members

        public override void SwapBuffers()

        {

            Egl.SwapBuffers(WindowInfo.Display, WindowInfo.Surface);

        }

        public override void MakeCurrent(IWindowInfo window)

        {

            // Ignore 'window', unless it actually is an EGL window. In other words,

            // trying to make the EglContext current on a non-EGL window will do,

            // nothing (the EglContext will remain current on the previous EGL window

            // or the window it was constructed on (which may not be EGL)).

            if (window is EglWindowInfo)

                WindowInfo = (EglWindowInfo)window;

            Egl.MakeCurrent(WindowInfo.Display, WindowInfo.Surface, WindowInfo.Surface, HandleAsEGLContext);

        }

        public override bool IsCurrent

        {

            get { return Egl.GetCurrentContext() == HandleAsEGLContext; }

        }

        public override bool VSync

        {

            get

            {

                // Egl.GetSwapInterval does not exist, so store and return the current interval.

                // The default interval is defined as 1 (true).

                return vsync;

            }

            set

            {

                if (Egl.SwapInterval(WindowInfo.Display, value ? 1 : 0))

                    vsync = value;

                else

                    Debug.Print("[Warning] Egl.SwapInterval({0}, {1}) failed.", WindowInfo.Display, value);

            }

        }

        #endregion

        #region IGraphicsContextInternal Members

        public override IntPtr GetAddress(string function)

        {

            return Egl.GetProcAddress(function);

        }

        #endregion

        #region IDisposable Members

        public override void Dispose()

        {

            Dispose(true);

            GC.SuppressFinalize(this);

        }

        // Todo: cross-reference the specs. What should happen if the context is destroyed from a different

        // thread?

        void Dispose(bool manual)

        {

            if (!IsDisposed)

            {

                if (manual)

                {

                    Egl.MakeCurrent(WindowInfo.Display, WindowInfo.Surface, WindowInfo.Surface, IntPtr.Zero);

                    Egl.DestroyContext(WindowInfo.Display, HandleAsEGLContext);

                }

                else

                {

                    Debug.Print("[Warning] {0}:{1} was not disposed.", this.GetType().Name, HandleAsEGLContext);

                }

                IsDisposed = true;

            }

        }

        ~EglContext()

        {

            Dispose(false);

        }

        #endregion

    }

}