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