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231 lines
8.5 KiB
C#
231 lines
8.5 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.Diagnostics;
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using System.Text;
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using OpenTK.Graphics;
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namespace OpenTK.Platform.MacOS
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{
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class AglGraphicsMode
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{
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public GraphicsMode SelectGraphicsMode(ColorFormat color, int depth, int stencil,
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int samples, ColorFormat accum, int buffers, bool stereo, out IntPtr pixelformat)
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{
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do
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{
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pixelformat = SelectPixelFormat(
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color, depth, stencil, samples, accum, buffers, stereo);
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if (pixelformat == IntPtr.Zero)
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{
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if (!RelaxGraphicsMode(
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ref color, ref depth, ref stencil, ref samples, ref accum,
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ref buffers, ref stereo))
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{
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throw new GraphicsModeException("Requested GraphicsMode not available, error: " + Agl.GetError());
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}
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}
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}
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while (pixelformat == IntPtr.Zero);
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return GetGraphicsModeFromPixelFormat(pixelformat);
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}
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#region Internal Members
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static bool RelaxGraphicsMode(ref ColorFormat color, ref int depth, ref int stencil, ref int samples, ref ColorFormat accum, ref int buffers, ref bool stereo)
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{
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// Parameters are relaxed in order of importance.
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// - Accumulator buffers are way outdated as a concept,
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// so they go first.
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// - Triple+ buffering is generally not supported by the
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// core WGL/GLX/AGL/CGL/EGL specs, so we clamp
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// to double-buffering as a second step. (If this doesn't help
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// we will also fall back to undefined single/double buffering
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// as a last resort).
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// - AA samples are an easy way to increase compatibility
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// so they go next.
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// - Stereoscopic is only supported on very few GPUs
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// (Quadro/FirePro series) so it goes next.
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// - The rest of the parameters then follow.
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if (accum != 0)
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{
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accum = 0;
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return true;
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}
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if (buffers > 2)
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{
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buffers = 2;
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return true;
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}
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if (samples > 0)
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{
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samples = Math.Max(samples - 1, 0);
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return true;
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}
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if (stereo)
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{
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stereo = false;
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return true;
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}
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if (stencil != 0)
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{
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stencil = 0;
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return true;
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}
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if (depth != 0)
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{
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depth = 0;
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return true;
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}
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if (color != 24)
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{
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color = 24;
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return true;
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}
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if (buffers != 0)
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{
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buffers = 0;
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return true;
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}
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// no parameters left to relax, fail
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return false;
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}
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GraphicsMode GetGraphicsModeFromPixelFormat(IntPtr pixelformat)
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{
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int r, g, b, a;
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Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_RED_SIZE, out r);
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Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_GREEN_SIZE, out g);
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Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_BLUE_SIZE, out b);
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Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_ALPHA_SIZE, out a);
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int ar, ag, ab, aa;
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Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_ACCUM_ALPHA_SIZE, out aa);
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Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_ACCUM_RED_SIZE, out ar);
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Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_ACCUM_GREEN_SIZE, out ag);
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Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_ACCUM_BLUE_SIZE, out ab);
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int depth, stencil, samples, buffers, stereo;
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Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_DEPTH_SIZE, out depth);
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Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_STENCIL_SIZE, out stencil);
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Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_SAMPLES_ARB, out samples);
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Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_DOUBLEBUFFER, out buffers);
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Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_STEREO, out stereo);
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return new GraphicsMode(new ColorFormat(r, g, b, a),
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depth, stencil, samples, new ColorFormat(ar, ag, ab, aa), buffers + 1, stereo != 0);
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}
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IntPtr SelectPixelFormat(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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List<int> attribs = new List<int>();
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Debug.Print("Bits per pixel: {0}", color.BitsPerPixel);
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if (color.BitsPerPixel > 0)
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{
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if (!color.IsIndexed)
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{
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attribs.Add((int)Agl.PixelFormatAttribute.AGL_RGBA);
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}
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attribs.Add((int)Agl.PixelFormatAttribute.AGL_RED_SIZE);
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attribs.Add(color.Red);
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attribs.Add((int)Agl.PixelFormatAttribute.AGL_GREEN_SIZE);
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attribs.Add(color.Green);
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attribs.Add((int)Agl.PixelFormatAttribute.AGL_BLUE_SIZE);
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attribs.Add(color.Blue);
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attribs.Add((int)Agl.PixelFormatAttribute.AGL_ALPHA_SIZE);
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attribs.Add(color.Alpha);
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}
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Debug.Print("Depth: {0}", depth);
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if (depth > 0)
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{
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attribs.Add((int)Agl.PixelFormatAttribute.AGL_DEPTH_SIZE);
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attribs.Add(depth);
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}
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if (buffers > 1)
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{
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attribs.Add((int)Agl.PixelFormatAttribute.AGL_DOUBLEBUFFER);
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}
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if (stencil > 0)
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{
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attribs.Add((int)Agl.PixelFormatAttribute.AGL_STENCIL_SIZE);
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attribs.Add(stencil);
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}
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if (accum.BitsPerPixel > 0)
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{
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attribs.Add((int)Agl.PixelFormatAttribute.AGL_ACCUM_ALPHA_SIZE);
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attribs.Add(accum.Alpha);
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attribs.Add((int)Agl.PixelFormatAttribute.AGL_ACCUM_BLUE_SIZE);
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attribs.Add(accum.Blue);
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attribs.Add((int)Agl.PixelFormatAttribute.AGL_ACCUM_GREEN_SIZE);
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attribs.Add(accum.Green);
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attribs.Add((int)Agl.PixelFormatAttribute.AGL_ACCUM_RED_SIZE);
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attribs.Add(accum.Red);
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}
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if (samples > 0)
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{
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attribs.Add((int)Agl.PixelFormatAttribute.AGL_SAMPLE_BUFFERS_ARB);
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attribs.Add(1);
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attribs.Add((int)Agl.PixelFormatAttribute.AGL_SAMPLES_ARB);
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attribs.Add(samples);
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}
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if (stereo)
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{
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attribs.Add((int)Agl.PixelFormatAttribute.AGL_STEREO);
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}
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attribs.Add(0);
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attribs.Add(0);
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IntPtr pixelformat = Agl.aglChoosePixelFormat(IntPtr.Zero, 0, attribs.ToArray());
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return pixelformat;
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}
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#endregion
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}
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}
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