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280 lines
11 KiB
C#
280 lines
11 KiB
C#
#region --- License ---
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/* Licensed under the MIT/X11 license.
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* Copyright (c) 2006-2008 the OpenTK Team.
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* This notice may not be removed from any source distribution.
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* See license.txt for licensing detailed licensing details.
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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.Runtime.InteropServices;
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using System.Diagnostics;
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using OpenTK.Graphics;
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namespace OpenTK.Platform.X11
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{
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class X11GraphicsMode
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{
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// Todo: Add custom visual selection algorithm, instead of ChooseFBConfig/ChooseVisual.
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// It seems the Choose* methods do not take multisampling into account (at least on some
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// drivers).
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#region Constructors
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public X11GraphicsMode()
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{
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}
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#endregion
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#region IGraphicsMode Members
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public GraphicsMode SelectGraphicsMode(GraphicsMode desired_mode, out IntPtr visual, out IntPtr fbconfig)
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{
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GraphicsMode gfx;
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GraphicsMode mode = new GraphicsMode(desired_mode);
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visual = IntPtr.Zero;
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fbconfig = IntPtr.Zero;
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IntPtr display = API.DefaultDisplay;
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do
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{
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// Try to select a visual using Glx.ChooseFBConfig and Glx.GetVisualFromFBConfig.
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// This is only supported on GLX 1.3 - if it fails, fall back to Glx.ChooseVisual.
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fbconfig = SelectFBConfig(mode);
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if (fbconfig != IntPtr.Zero)
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visual = Glx.GetVisualFromFBConfig(display, fbconfig);
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if (visual == IntPtr.Zero)
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visual = SelectVisual(mode);
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if (visual == IntPtr.Zero)
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{
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// Relax parameters and retry
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if (!Utilities.RelaxGraphicsMode(ref mode))
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throw new GraphicsModeException("Requested GraphicsMode not available.");
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}
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}
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while (visual == IntPtr.Zero);
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XVisualInfo info = (XVisualInfo)Marshal.PtrToStructure(visual, typeof(XVisualInfo));
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gfx = CreateGraphicsMode(display, ref info);
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return gfx;
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}
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#endregion
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#region Private Members
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static GraphicsMode CreateGraphicsMode(IntPtr display, ref XVisualInfo info)
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{
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// See what we *really* got:
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int r, g, b, a;
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Glx.GetConfig(display, ref info, GLXAttribute.ALPHA_SIZE, out a);
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Glx.GetConfig(display, ref info, GLXAttribute.RED_SIZE, out r);
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Glx.GetConfig(display, ref info, GLXAttribute.GREEN_SIZE, out g);
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Glx.GetConfig(display, ref info, GLXAttribute.BLUE_SIZE, out b);
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int ar, ag, ab, aa;
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Glx.GetConfig(display, ref info, GLXAttribute.ACCUM_ALPHA_SIZE, out aa);
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Glx.GetConfig(display, ref info, GLXAttribute.ACCUM_RED_SIZE, out ar);
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Glx.GetConfig(display, ref info, GLXAttribute.ACCUM_GREEN_SIZE, out ag);
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Glx.GetConfig(display, ref info, GLXAttribute.ACCUM_BLUE_SIZE, out ab);
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int depth, stencil, samples, buffers;
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Glx.GetConfig(display, ref info, GLXAttribute.DEPTH_SIZE, out depth);
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Glx.GetConfig(display, ref info, GLXAttribute.STENCIL_SIZE, out stencil);
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Glx.GetConfig(display, ref info, GLXAttribute.SAMPLES, out samples);
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Glx.GetConfig(display, ref info, GLXAttribute.DOUBLEBUFFER, out buffers);
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int st;
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Glx.GetConfig(display, ref info, GLXAttribute.STEREO, out st);
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// Note: Glx.GetConfig return buffers = 0 (false) or 1 (true).
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// OpenTK expects buffers = 1 (single-) or 2 (double-buffering),
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// so increase the GLX value by one.
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return new GraphicsMode(info.VisualID, new ColorFormat(r, g, b, a), depth, stencil, samples,
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new ColorFormat(ar, ag, ab, aa), buffers + 1, st != 0);
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}
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IntPtr SelectFBConfig(GraphicsMode mode)
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{
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Debug.Print("Selecting FB config for {0}", mode);
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List<int> visualAttributes = new List<int>();
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if (mode.ColorFormat.BitsPerPixel > 0)
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{
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if (!mode.ColorFormat.IsIndexed)
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{
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visualAttributes.Add((int)GLXAttribute.RENDER_TYPE);
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visualAttributes.Add((int)GLXRenderTypeMask.RGBA_BIT);
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}
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visualAttributes.Add((int)GLXAttribute.RED_SIZE);
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visualAttributes.Add(mode.ColorFormat.Red);
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visualAttributes.Add((int)GLXAttribute.GREEN_SIZE);
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visualAttributes.Add(mode.ColorFormat.Green);
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visualAttributes.Add((int)GLXAttribute.BLUE_SIZE);
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visualAttributes.Add(mode.ColorFormat.Blue);
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visualAttributes.Add((int)GLXAttribute.ALPHA_SIZE);
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visualAttributes.Add(mode.ColorFormat.Alpha);
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}
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if (mode.Depth > 0)
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{
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visualAttributes.Add((int)GLXAttribute.DEPTH_SIZE);
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visualAttributes.Add(mode.Depth);
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}
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if (mode.Buffers > 1)
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{
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visualAttributes.Add((int)GLXAttribute.DOUBLEBUFFER);
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visualAttributes.Add(1);
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}
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if (mode.Stereo)
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{
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visualAttributes.Add((int)GLXAttribute.STENCIL_SIZE);
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visualAttributes.Add(mode.Stereo ? 1 : 0);
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}
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if (mode.AccumulatorFormat.BitsPerPixel > 0)
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{
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visualAttributes.Add((int)GLXAttribute.ACCUM_ALPHA_SIZE);
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visualAttributes.Add(mode.AccumulatorFormat.Alpha);
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visualAttributes.Add((int)GLXAttribute.ACCUM_BLUE_SIZE);
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visualAttributes.Add(mode.AccumulatorFormat.Blue);
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visualAttributes.Add((int)GLXAttribute.ACCUM_GREEN_SIZE);
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visualAttributes.Add(mode.AccumulatorFormat.Green);
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visualAttributes.Add((int)GLXAttribute.ACCUM_RED_SIZE);
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visualAttributes.Add(mode.AccumulatorFormat.Red);
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}
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if (mode.Samples > 0)
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{
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visualAttributes.Add((int)GLXAttribute.SAMPLE_BUFFERS);
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visualAttributes.Add(1);
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visualAttributes.Add((int)GLXAttribute.SAMPLES);
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visualAttributes.Add(mode.Samples);
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}
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if (mode.Stereo)
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{
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visualAttributes.Add((int)GLXAttribute.STEREO);
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visualAttributes.Add(1);
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}
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visualAttributes.Add(0);
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// Select a visual that matches the parameters set by the user.
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IntPtr display = API.DefaultDisplay;
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IntPtr result = IntPtr.Zero;
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using (new XLock(display))
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{
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try
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{
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int screen = Functions.XDefaultScreen(display);
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IntPtr root = Functions.XRootWindow(display, screen);
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Debug.Print("Display: {0}, Screen: {1}, RootWindow: {2}", display, screen, root);
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unsafe
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{
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Debug.Print("Getting FB config.");
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int fbcount;
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// Note that ChooseFBConfig returns an array of GLXFBConfig opaque structures (i.e. mapped to IntPtrs).
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IntPtr* fbconfigs = Glx.ChooseFBConfig(display, screen, visualAttributes.ToArray(), out fbcount);
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if (fbcount > 0 && fbconfigs != null)
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{
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// We want to use the first GLXFBConfig from the fbconfigs array (the first one is the best match).
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Debug.Print("Selected FB config: {0}", *fbconfigs);
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result = *fbconfigs;
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Functions.XFree((IntPtr)fbconfigs);
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}
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else
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{
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Debug.Print("No matching FB config found.");
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}
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}
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}
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catch (EntryPointNotFoundException)
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{
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Debug.Print("Function glXChooseFBConfig not supported.");
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}
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}
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return result;
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}
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IntPtr SelectVisual(GraphicsMode mode)
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{
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Debug.Print("Selecting FB config for {0}", mode);
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List<int> visualAttributes = new List<int>();
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if (mode.ColorFormat.BitsPerPixel > 0)
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{
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if (!mode.ColorFormat.IsIndexed)
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visualAttributes.Add((int)GLXAttribute.RGBA);
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visualAttributes.Add((int)GLXAttribute.RED_SIZE);
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visualAttributes.Add(mode.ColorFormat.Red);
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visualAttributes.Add((int)GLXAttribute.GREEN_SIZE);
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visualAttributes.Add(mode.ColorFormat.Green);
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visualAttributes.Add((int)GLXAttribute.BLUE_SIZE);
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visualAttributes.Add(mode.ColorFormat.Blue);
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visualAttributes.Add((int)GLXAttribute.ALPHA_SIZE);
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visualAttributes.Add(mode.ColorFormat.Alpha);
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}
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if (mode.Depth > 0)
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{
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visualAttributes.Add((int)GLXAttribute.DEPTH_SIZE);
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visualAttributes.Add(mode.Depth);
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}
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if (mode.Buffers > 1)
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visualAttributes.Add((int)GLXAttribute.DOUBLEBUFFER);
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if (mode.Stencil > 1)
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{
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visualAttributes.Add((int)GLXAttribute.STENCIL_SIZE);
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visualAttributes.Add(mode.Stencil);
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}
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if (mode.AccumulatorFormat.BitsPerPixel > 0)
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{
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visualAttributes.Add((int)GLXAttribute.ACCUM_ALPHA_SIZE);
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visualAttributes.Add(mode.AccumulatorFormat.Alpha);
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visualAttributes.Add((int)GLXAttribute.ACCUM_BLUE_SIZE);
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visualAttributes.Add(mode.AccumulatorFormat.Blue);
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visualAttributes.Add((int)GLXAttribute.ACCUM_GREEN_SIZE);
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visualAttributes.Add(mode.AccumulatorFormat.Green);
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visualAttributes.Add((int)GLXAttribute.ACCUM_RED_SIZE);
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visualAttributes.Add(mode.AccumulatorFormat.Red);
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}
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if (mode.Samples > 0)
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{
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visualAttributes.Add((int)GLXAttribute.SAMPLE_BUFFERS);
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visualAttributes.Add(1);
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visualAttributes.Add((int)GLXAttribute.SAMPLES);
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visualAttributes.Add(mode.Samples);
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}
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if (mode.Stereo)
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visualAttributes.Add((int)GLXAttribute.STEREO);
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visualAttributes.Add(0);
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Debug.Print("Falling back to glXChooseVisual.");
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IntPtr display = API.DefaultDisplay;
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using (new XLock(display))
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{
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return Glx.ChooseVisual(display, Functions.XDefaultScreen(display), visualAttributes.ToArray());
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}
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}
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#endregion
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}
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}
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