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1723be8a8b
Instead of creating a list of all available formats and iterating through that, we let the driver decide which is the best accelerated format to use for the user parameters. If no such format exists, we fall back to generic acceleration or software acceleration, in turn. This affects issue #21
357 lines
14 KiB
C#
357 lines
14 KiB
C#
#region License
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//
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// The Open Toolkit Library License
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//
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// Copyright (c) 2006 - 2010 the Open Toolkit library.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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// the Software, and to permit persons to whom the Software is furnished to do
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// so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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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.Diagnostics;
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using System.Runtime.InteropServices;
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using OpenTK.Graphics;
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namespace OpenTK.Platform.Windows
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{
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class WinGraphicsMode : IGraphicsMode
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{
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enum AccelerationType
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{
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// Software acceleration
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None = 0,
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// Partial acceleration (Direct3D emulation)
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MCD,
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// Full acceleration
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ICD,
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}
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static readonly object SyncRoot = new object();
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readonly IntPtr Device;
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readonly List<GraphicsMode> modes = new List<GraphicsMode>();
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#region Constructors
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public WinGraphicsMode(IntPtr device)
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{
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if (device == IntPtr.Zero)
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throw new ArgumentException();
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Device = device;
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}
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#endregion
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#region IGraphicsMode Members
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public GraphicsMode SelectGraphicsMode(ColorFormat color, int depth, int stencil, int samples,
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ColorFormat accum, int buffers, bool stereo)
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{
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GraphicsMode mode = new GraphicsMode(color, depth, stencil, samples,accum, buffers, stereo);
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GraphicsMode created_mode = ChoosePixelFormatARB(Device, mode);
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// If ChoosePixelFormatARB failed, iterate through all acceleration types in turn (ICD, MCD, None)
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// This should fix issue #2224, which causes OpenTK to fail on VMs without hardware acceleration.
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created_mode = created_mode ?? ChoosePixelFormatPFD(Device, mode, AccelerationType.ICD);
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created_mode = created_mode ?? ChoosePixelFormatPFD(Device, mode, AccelerationType.MCD);
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created_mode = created_mode ?? ChoosePixelFormatPFD(Device, mode, AccelerationType.None);
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if (created_mode == null)
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{
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throw new GraphicsModeException("The requested GraphicsMode is not supported");
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}
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return created_mode;
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}
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#endregion
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#region Private Methods
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#region ChoosePixelFormatARB
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// Queries pixel formats through the WGL_ARB_pixel_format extension
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// This method only returns accelerated formats. If no format offers
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// hardware acceleration (e.g. we are running in a VM or in a remote desktop
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// connection), this method will return 0 formats and we will fall back to
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// ChoosePixelFormatPFD.
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GraphicsMode ChoosePixelFormatARB(IntPtr device, GraphicsMode mode)
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{
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GraphicsMode created_mode = null;
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if (Wgl.Delegates.wglChoosePixelFormatARB != null)
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{
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List<int> attributes = new List<int>();
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attributes.Add((int)WGL_ARB_pixel_format.AccelerationArb);
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attributes.Add((int)WGL_ARB_pixel_format.FullAccelerationArb);
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if (mode.ColorFormat.BitsPerPixel > 0)
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{
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attributes.Add((int)WGL_ARB_pixel_format.RedBitsArb);
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attributes.Add(mode.ColorFormat.Red);
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attributes.Add((int)WGL_ARB_pixel_format.GreenBitsArb);
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attributes.Add(mode.ColorFormat.Green);
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attributes.Add((int)WGL_ARB_pixel_format.BlueBitsArb);
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attributes.Add(mode.ColorFormat.Blue);
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attributes.Add((int)WGL_ARB_pixel_format.AlphaBitsArb);
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attributes.Add(mode.ColorFormat.Alpha);
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attributes.Add((int)WGL_ARB_pixel_format.ColorBitsArb);
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attributes.Add(mode.ColorFormat.BitsPerPixel);
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}
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if (mode.Depth > 0)
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{
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attributes.Add((int)WGL_ARB_pixel_format.DepthBitsArb);
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attributes.Add(mode.Depth);
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}
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if (mode.Stencil > 0)
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{
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attributes.Add((int)WGL_ARB_pixel_format.StencilBitsArb);
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attributes.Add(mode.Stencil);
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}
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if (mode.AccumulatorFormat.BitsPerPixel > 0)
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{
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attributes.Add((int)WGL_ARB_pixel_format.AccumRedBitsArb);
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attributes.Add(mode.AccumulatorFormat.Red);
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attributes.Add((int)WGL_ARB_pixel_format.AccumGreenBitsArb);
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attributes.Add(mode.AccumulatorFormat.Green);
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attributes.Add((int)WGL_ARB_pixel_format.AccumBlueBitsArb);
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attributes.Add(mode.AccumulatorFormat.Blue);
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attributes.Add((int)WGL_ARB_pixel_format.AccumAlphaBitsArb);
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attributes.Add(mode.AccumulatorFormat.Alpha);
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attributes.Add((int)WGL_ARB_pixel_format.AccumBitsArb);
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attributes.Add(mode.AccumulatorFormat.BitsPerPixel);
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}
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if (mode.Samples > 0)
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{
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attributes.Add((int)WGL_ARB_multisample.SampleBuffersArb);
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attributes.Add(1);
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attributes.Add((int)WGL_ARB_multisample.SamplesArb);
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attributes.Add(mode.Samples);
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}
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if (mode.Buffers > 0)
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{
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attributes.Add((int)WGL_ARB_pixel_format.DoubleBufferArb);
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attributes.Add(mode.Buffers);
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}
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if (mode.Stereo)
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{
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attributes.Add((int)WGL_ARB_pixel_format.StereoArb);
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attributes.Add(1);
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}
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attributes.Add(0);
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attributes.Add(0);
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int[] format = new int[1];
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int count;
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if (Wgl.Arb.ChoosePixelFormat(device, attributes.ToArray(), null, format.Length, format, out count))
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{
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created_mode = DescribePixelFormatARB(device, format[0]);
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}
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else
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{
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Debug.Print("[WGL] ChoosePixelFormatARB failed with {0}", Marshal.GetLastWin32Error());
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}
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}
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else
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{
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Debug.Print("[WGL] ChoosePixelFormatARB not supported");
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}
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return created_mode;
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}
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#endregion
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#region ChoosePixelFormatPFD
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GraphicsMode ChoosePixelFormatPFD(IntPtr Device, GraphicsMode mode, AccelerationType requested_acceleration_type)
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{
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PixelFormatDescriptor pfd = new PixelFormatDescriptor();
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pfd.Size = (short)BlittableValueType<PixelFormatDescriptor>.Stride;
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if (mode.ColorFormat.BitsPerPixel > 0)
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{
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pfd.RedBits = (byte)mode.ColorFormat.Red;
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pfd.GreenBits = (byte)mode.ColorFormat.Green;
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pfd.BlueBits = (byte)mode.ColorFormat.Blue;
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pfd.AlphaBits = (byte)mode.ColorFormat.Alpha;
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pfd.ColorBits = (byte)mode.ColorFormat.BitsPerPixel;
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}
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if (mode.Depth > 0)
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{
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pfd.DepthBits = (byte)mode.Depth;
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}
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if (mode.Stencil > 0)
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{
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pfd.StencilBits = (byte)mode.Stencil;
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}
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if (mode.AccumulatorFormat.BitsPerPixel > 0)
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{
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pfd.AccumRedBits = (byte)mode.AccumulatorFormat.Red;
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pfd.AccumGreenBits = (byte)mode.AccumulatorFormat.Green;
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pfd.AccumBlueBits = (byte)mode.AccumulatorFormat.Blue;
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pfd.AccumAlphaBits = (byte)mode.AccumulatorFormat.Alpha;
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pfd.AccumBits = (byte)mode.AccumulatorFormat.BitsPerPixel;
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}
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if (mode.Buffers > 0)
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{
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pfd.Flags |= PixelFormatDescriptorFlags.DOUBLEBUFFER;
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}
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if (mode.Stereo)
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{
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pfd.Flags |= PixelFormatDescriptorFlags.DRAW_TO_WINDOW;
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pfd.Flags |= PixelFormatDescriptorFlags.SUPPORT_OPENGL;
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}
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// Make sure we don't turn off Aero on Vista and newer.
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if (Environment.OSVersion.Version.Major >= 6)
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{
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pfd.Flags |= PixelFormatDescriptorFlags.SUPPORT_COMPOSITION;
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}
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GraphicsMode created_mode = null;
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int pixelformat = Functions.ChoosePixelFormat(Device, ref pfd);
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if (pixelformat > 0)
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{
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AccelerationType acceleration_type = AccelerationType.ICD;
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if ((pfd.Flags & PixelFormatDescriptorFlags.GENERIC_FORMAT) != 0)
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{
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if ((pfd.Flags & PixelFormatDescriptorFlags.GENERIC_ACCELERATED) != 0)
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{
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acceleration_type = AccelerationType.MCD;
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}
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else
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{
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acceleration_type = AccelerationType.None;
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}
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}
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if (acceleration_type == requested_acceleration_type)
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{
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created_mode = DescribePixelFormatPFD(ref pfd, pixelformat);
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}
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}
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return created_mode;
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}
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#endregion
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#region DescribePixelFormatPFD
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static GraphicsMode DescribePixelFormatPFD(ref PixelFormatDescriptor pfd, int pixelformat)
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{
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return new GraphicsMode(
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new IntPtr(pixelformat),
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new ColorFormat(pfd.RedBits, pfd.GreenBits, pfd.BlueBits, pfd.AlphaBits),
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pfd.DepthBits,
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pfd.StencilBits,
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0, // MSAA not supported
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new ColorFormat(pfd.AccumRedBits, pfd.AccumGreenBits, pfd.AccumBlueBits, pfd.AccumAlphaBits),
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(pfd.Flags & PixelFormatDescriptorFlags.DOUBLEBUFFER) != 0 ? 2 : 1,
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(pfd.Flags & PixelFormatDescriptorFlags.STEREO) != 0);
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}
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#endregion
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#region DescribePixelFormatARB
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GraphicsMode DescribePixelFormatARB(IntPtr device, int pixelformat)
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{
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GraphicsMode created_mode = null;
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// See http://www.opengl.org/registry/specs/ARB/wgl_pixel_format.txt for more details
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if (Wgl.Delegates.wglGetPixelFormatAttribivARB != null)
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{
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// Define the list of attributes we are interested in.
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// The results will be stored in the 'values' array below.
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int[] attribs = new int[]
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{
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(int)WGL_ARB_pixel_format.AccelerationArb,
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(int)WGL_ARB_pixel_format.RedBitsArb,
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(int)WGL_ARB_pixel_format.GreenBitsArb,
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(int)WGL_ARB_pixel_format.BlueBitsArb,
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(int)WGL_ARB_pixel_format.AlphaBitsArb,
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(int)WGL_ARB_pixel_format.ColorBitsArb,
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(int)WGL_ARB_pixel_format.DepthBitsArb,
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(int)WGL_ARB_pixel_format.StencilBitsArb,
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(int)WGL_ARB_multisample.SampleBuffersArb,
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(int)WGL_ARB_multisample.SamplesArb,
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(int)WGL_ARB_pixel_format.AccumRedBitsArb,
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(int)WGL_ARB_pixel_format.AccumGreenBitsArb,
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(int)WGL_ARB_pixel_format.AccumBlueBitsArb,
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(int)WGL_ARB_pixel_format.AccumAlphaBitsArb,
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(int)WGL_ARB_pixel_format.AccumBitsArb,
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(int)WGL_ARB_pixel_format.DoubleBufferArb,
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(int)WGL_ARB_pixel_format.StereoArb,
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0
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};
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// Allocate storage for the results of GetPixelFormatAttrib queries
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int[] values = new int[attribs.Length];
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// Get the format attributes for this pixel format
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if (!Wgl.Arb.GetPixelFormatAttrib(device, pixelformat, 0, attribs.Length - 1, attribs, values))
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{
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Debug.Print("[Warning] Failed to detect attributes for PixelFormat: {0}.", pixelformat);
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}
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// Skip formats that don't offer full hardware acceleration
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WGL_ARB_pixel_format acceleration = (WGL_ARB_pixel_format)attribs[0];
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if (acceleration == WGL_ARB_pixel_format.FullAccelerationArb)
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{
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// Construct a new GraphicsMode to describe this format
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created_mode = new GraphicsMode(new IntPtr(pixelformat),
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new ColorFormat(values[1], values[2], values[3], values[4]),
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values[6],
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values[7],
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values[8] != 0 ? values[9] : 0,
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new ColorFormat(values[10], values[11], values[12], values[13]),
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values[15] == 1 ? 2 : 1,
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values[16] == 1 ? true : false);
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}
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}
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return created_mode;
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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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