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#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 System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;
using System.Runtime.InteropServices;

using OpenTK.Graphics;
using ColorDepth = OpenTK.Graphics.ColorFormat;

namespace OpenTK.Platform.Windows
{
    internal class WinGraphicsMode : IGraphicsMode
    {
        // Todo: Get rid of the System.Windows.Forms.Control dependency.

        #region --- Fields ---

        // To avoid recursion when calling GraphicsMode.Default
        bool creating;

        #endregion

        #region --- Constructors ---

        public WinGraphicsMode()
        {
        }

        #endregion

        #region --- IGraphicsMode Members ---

        public GraphicsMode SelectGraphicsMode(ColorDepth color, int depth, int stencil, int samples, ColorDepth accum,
                                               int buffers, bool stereo)
        {
            GraphicsMode mode = null;
            if (!creating)
            {
                try
                {
                    creating = true;
                    mode = SelectGraphicsModeARB(color, depth, stencil, samples, accum, buffers, stereo);
                }
                finally
                {
                    creating = false;
                }
            }
            if (mode == null)
                mode = SelectGraphicsModePFD(color, depth, stencil, samples, accum, buffers, stereo);
            return mode;
        }

        #endregion

        #region --- Private Methods ---

        #region SelectGraphicsModePFD

        GraphicsMode SelectGraphicsModePFD(ColorDepth color, int depth, int stencil, int samples, ColorDepth accum,
            int buffers, bool stereo)
        {
            using (Control native_window = new Control())
            using (WinWindowInfo window = new WinWindowInfo(native_window.Handle, null))
            {
                IntPtr deviceContext = ((WinWindowInfo)window).DeviceContext;
                Debug.WriteLine(String.Format("Device context: {0}", deviceContext));

                Debug.Write("Selecting pixel format... ");
                PixelFormatDescriptor pixelFormat = new PixelFormatDescriptor();
                pixelFormat.Size = API.PixelFormatDescriptorSize;
                pixelFormat.Version = API.PixelFormatDescriptorVersion;
                pixelFormat.Flags =
                    PixelFormatDescriptorFlags.SUPPORT_OPENGL |
                    PixelFormatDescriptorFlags.DRAW_TO_WINDOW;
                pixelFormat.ColorBits = (byte)(color.Red + color.Green + color.Blue);

                pixelFormat.PixelType = color.IsIndexed ? PixelType.INDEXED : PixelType.RGBA;
                pixelFormat.RedBits = (byte)color.Red;
                pixelFormat.GreenBits = (byte)color.Green;
                pixelFormat.BlueBits = (byte)color.Blue;
                pixelFormat.AlphaBits = (byte)color.Alpha;

                if (accum.BitsPerPixel > 0)
                {
                    pixelFormat.AccumBits = (byte)(accum.Red + accum.Green + accum.Blue);
                    pixelFormat.AccumRedBits = (byte)accum.Red;
                    pixelFormat.AccumGreenBits = (byte)accum.Green;
                    pixelFormat.AccumBlueBits = (byte)accum.Blue;
                    pixelFormat.AccumAlphaBits = (byte)accum.Alpha;
                }

                pixelFormat.DepthBits = (byte)depth;
                pixelFormat.StencilBits = (byte)stencil;

                if (depth <= 0) pixelFormat.Flags |= PixelFormatDescriptorFlags.DEPTH_DONTCARE;
                if (stereo) pixelFormat.Flags |= PixelFormatDescriptorFlags.STEREO;
                if (buffers > 1) pixelFormat.Flags |= PixelFormatDescriptorFlags.DOUBLEBUFFER;

                int pixel = Functions.ChoosePixelFormat(deviceContext, ref pixelFormat);
                if (pixel == 0)
                    throw new GraphicsModeException("The requested GraphicsMode is not available.");

                // Find out what we really got as a format:
                PixelFormatDescriptor pfd = new PixelFormatDescriptor();
                pixelFormat.Size = API.PixelFormatDescriptorSize;
                pixelFormat.Version = API.PixelFormatDescriptorVersion;
                Functions.DescribePixelFormat(deviceContext, pixel, API.PixelFormatDescriptorSize, ref pfd);
                GraphicsMode fmt = new GraphicsMode((IntPtr)pixel,
                    new ColorDepth(pfd.RedBits, pfd.GreenBits, pfd.BlueBits, pfd.AlphaBits),
                    pfd.DepthBits,
                    pfd.StencilBits,
                    0,
                    new ColorDepth(pfd.AccumBits),
                    (pfd.Flags & PixelFormatDescriptorFlags.DOUBLEBUFFER) != 0 ? 2 : 1,
                    (pfd.Flags & PixelFormatDescriptorFlags.STEREO) != 0);

                return fmt;
            }
        }

        #endregion

        #region SelectGraphicsModeARB

        GraphicsMode SelectGraphicsModeARB(ColorDepth color, int depth, int stencil, int samples, ColorDepth accum,
            int buffers, bool stereo)
        {
            using (INativeWindow native_window = new NativeWindow())
            using (IGraphicsContext context = new GraphicsContext(new GraphicsMode(new ColorFormat(), 0, 0, 0, new ColorFormat(), 2, false), native_window.WindowInfo, 1, 0, GraphicsContextFlags.Default))
            {
                WinWindowInfo window = (WinWindowInfo)native_window.WindowInfo;

                // See http://www.opengl.org/registry/specs/ARB/wgl_pixel_format.txt
                // for more details
                Debug.Write("Selecting pixel format (ARB)... ");
                if (Wgl.Delegates.wglChoosePixelFormatARB == null || Wgl.Delegates.wglGetPixelFormatAttribivARB == null)
                {
                    Debug.WriteLine("failed");
                    return null;
                }

                int[] attribs = new int[]
                {
                    (int)WGL_ARB_pixel_format.AccelerationArb,

                    (int)WGL_ARB_pixel_format.RedBitsArb,
                    (int)WGL_ARB_pixel_format.GreenBitsArb,
                    (int)WGL_ARB_pixel_format.BlueBitsArb,
                    (int)WGL_ARB_pixel_format.AlphaBitsArb,
                    (int)WGL_ARB_pixel_format.ColorBitsArb,
                   
                    (int)WGL_ARB_pixel_format.DepthBitsArb,
                    (int)WGL_ARB_pixel_format.StencilBitsArb,
                   
                    (int)WGL_ARB_multisample.SampleBuffersArb,
                    (int)WGL_ARB_multisample.SamplesArb,

                    (int)WGL_ARB_pixel_format.AccumRedBitsArb,
                    (int)WGL_ARB_pixel_format.AccumGreenBitsArb,
                    (int)WGL_ARB_pixel_format.AccumBlueBitsArb,
                    (int)WGL_ARB_pixel_format.AccumAlphaBitsArb,
                    (int)WGL_ARB_pixel_format.AccumBitsArb,

                    (int)WGL_ARB_pixel_format.DoubleBufferArb,
                    (int)WGL_ARB_pixel_format.StereoArb,
                    0
                };

                int[] values = new int[attribs.Length];

                int[] attribs_values = new int[]
                {
                    (int)WGL_ARB_pixel_format.AccelerationArb, (int)WGL_ARB_pixel_format.FullAccelerationArb,
                    (int)WGL_ARB_pixel_format.DrawToWindowArb, 1,

                    (int)WGL_ARB_pixel_format.RedBitsArb, color.Red,
                    (int)WGL_ARB_pixel_format.GreenBitsArb, color.Green,
                    (int)WGL_ARB_pixel_format.BlueBitsArb, color.Blue,
                    (int)WGL_ARB_pixel_format.AlphaBitsArb, color.Alpha,
                    (int)WGL_ARB_pixel_format.ColorBitsArb, color.BitsPerPixel - color.Alpha, // Should not contain alpha bpp (see spec)
                   
                    (int)WGL_ARB_pixel_format.DepthBitsArb, depth,
                    (int)WGL_ARB_pixel_format.StencilBitsArb, stencil,
                   
                    (int)WGL_ARB_multisample.SampleBuffersArb, samples > 0 ? 1 : 0,
                    (int)WGL_ARB_multisample.SamplesArb, samples,

                    (int)WGL_ARB_pixel_format.AccumRedBitsArb, accum.Red,
                    (int)WGL_ARB_pixel_format.AccumGreenBitsArb, accum.Green,
                    (int)WGL_ARB_pixel_format.AccumBlueBitsArb, accum.Blue,
                    (int)WGL_ARB_pixel_format.AccumAlphaBitsArb, accum.Alpha,
                    (int)WGL_ARB_pixel_format.AccumBitsArb, accum.BitsPerPixel, // Spec doesn't mention wether alpha bpp should be included...

                    (int)WGL_ARB_pixel_format.DoubleBufferArb, buffers > 1 ? 1 : 0,
                    (int)WGL_ARB_pixel_format.StereoArb, stereo ? 1 : 0,
                    0, 0
                };

                int[] pixel = new int[1], num_formats = new int[1];
                bool success = Wgl.Arb.ChoosePixelFormat(window.DeviceContext, attribs_values, null, 1, pixel, num_formats);
                if (!success || num_formats[0] == 0 || pixel[0] == 0)
                {
                    // Try again without an accumulator. Many modern cards cannot accelerate multisampled formats with accumulator buffers.
                    int index_of_accum = Array.IndexOf(attribs_values, (int)WGL_ARB_pixel_format.AccumRedBitsArb);
                    attribs_values[index_of_accum + 1] = attribs_values[index_of_accum + 3] =
                        attribs_values[index_of_accum + 5] = attribs_values[index_of_accum + 7] =
                        attribs_values[index_of_accum + 9] = 0;
                    Wgl.Arb.ChoosePixelFormat(window.DeviceContext, attribs_values, null, 1, pixel, num_formats);
                }
                if (!success || num_formats[0] == 0 || pixel[0] == 0)
                {
                    Debug.WriteLine("failed (no suitable pixel format).");
                    return null;
                }

                // Find out what we really got as a format:
                success = Wgl.Arb.GetPixelFormatAttrib(window.DeviceContext, pixel[0], 0, attribs.Length - 1, attribs, values);
                if (!success)
                {
                    Debug.WriteLine("failed (pixel format attributes could not be determined).");
                    return null;
                }
                   
                GraphicsMode mode = new GraphicsMode(new IntPtr(pixel[0]),
                    new ColorDepth(values[1], values[2], values[3], values[4]),
                    values[6],
                    values[7],
                    values[8] != 0 ? values[9] : 0,
                    new ColorDepth(values[10], values[11], values[12], values[13]),
                    values[15] == 1 ? 2 : 1,
                    values[16] == 1 ? true : false);

                Debug.WriteLine("success!");
                return mode;
            }
        }

        #endregion

        #endregion
    }
}