#region License
//
// The Open Toolkit Library License
//
// Copyright (c) 2006 - 2010 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.Diagnostics;
using System.Text;
using OpenTK.Graphics;
namespace OpenTK.Platform.MacOS
{
class AglGraphicsMode
{
public GraphicsMode SelectGraphicsMode(ColorFormat color, int depth, int stencil,
int samples, ColorFormat accum, int buffers, bool stereo, out IntPtr pixelformat)
{
do
{
pixelformat = SelectPixelFormat(
color, depth, stencil, samples, accum, buffers, stereo);
if (pixelformat == IntPtr.Zero)
{
if (!RelaxGraphicsMode(
ref color, ref depth, ref stencil, ref samples, ref accum,
ref buffers, ref stereo))
{
throw new GraphicsModeException("Requested GraphicsMode not available, error: " + Agl.GetError());
}
}
}
while (pixelformat == IntPtr.Zero);
return GetGraphicsModeFromPixelFormat(pixelformat);
}
#region Internal Members
static bool RelaxGraphicsMode(ref ColorFormat color, ref int depth, ref int stencil, ref int samples, ref ColorFormat accum, ref int buffers, ref bool stereo)
{
// Parameters are relaxed in order of importance.
// - Accumulator buffers are way outdated as a concept,
// so they go first.
// - Triple+ buffering is generally not supported by the
// core WGL/GLX/AGL/CGL/EGL specs, so we clamp
// to double-buffering as a second step. (If this doesn't help
// we will also fall back to undefined single/double buffering
// as a last resort).
// - AA samples are an easy way to increase compatibility
// so they go next.
// - Stereoscopic is only supported on very few GPUs
// (Quadro/FirePro series) so it goes next.
// - The rest of the parameters then follow.
if (accum != 0)
{
accum = 0;
return true;
}
if (buffers > 2)
{
buffers = 2;
return true;
}
if (samples > 0)
{
samples = Math.Max(samples - 1, 0);
return true;
}
if (stereo)
{
stereo = false;
return true;
}
if (stencil != 0)
{
stencil = 0;
return true;
}
if (depth != 0)
{
depth = 0;
return true;
}
if (color != 24)
{
color = 24;
return true;
}
if (buffers != 0)
{
buffers = 0;
return true;
}
// no parameters left to relax, fail
return false;
}
GraphicsMode GetGraphicsModeFromPixelFormat(IntPtr pixelformat)
{
int r, g, b, a;
Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_RED_SIZE, out r);
Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_GREEN_SIZE, out g);
Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_BLUE_SIZE, out b);
Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_ALPHA_SIZE, out a);
int ar, ag, ab, aa;
Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_ACCUM_ALPHA_SIZE, out aa);
Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_ACCUM_RED_SIZE, out ar);
Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_ACCUM_GREEN_SIZE, out ag);
Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_ACCUM_BLUE_SIZE, out ab);
int depth, stencil, samples, buffers, stereo;
Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_DEPTH_SIZE, out depth);
Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_STENCIL_SIZE, out stencil);
Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_SAMPLES_ARB, out samples);
Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_DOUBLEBUFFER, out buffers);
Agl.aglDescribePixelFormat(pixelformat, Agl.PixelFormatAttribute.AGL_STEREO, out stereo);
return new GraphicsMode(new ColorFormat(r, g, b, a),
depth, stencil, samples, new ColorFormat(ar, ag, ab, aa), buffers + 1, stereo != 0);
}
IntPtr SelectPixelFormat(ColorFormat color, int depth, int stencil, int samples,
ColorFormat accum, int buffers, bool stereo)
{
List<int> attribs = new List<int>();
Debug.Print("Bits per pixel: {0}", color.BitsPerPixel);
if (color.BitsPerPixel > 0)
{
if (!color.IsIndexed)
{
attribs.Add((int)Agl.PixelFormatAttribute.AGL_RGBA);
}
attribs.Add((int)Agl.PixelFormatAttribute.AGL_RED_SIZE);
attribs.Add(color.Red);
attribs.Add((int)Agl.PixelFormatAttribute.AGL_GREEN_SIZE);
attribs.Add(color.Green);
attribs.Add((int)Agl.PixelFormatAttribute.AGL_BLUE_SIZE);
attribs.Add(color.Blue);
attribs.Add((int)Agl.PixelFormatAttribute.AGL_ALPHA_SIZE);
attribs.Add(color.Alpha);
}
Debug.Print("Depth: {0}", depth);
if (depth > 0)
{
attribs.Add((int)Agl.PixelFormatAttribute.AGL_DEPTH_SIZE);
attribs.Add(depth);
}
if (buffers > 1)
{
attribs.Add((int)Agl.PixelFormatAttribute.AGL_DOUBLEBUFFER);
}
if (stencil > 0)
{
attribs.Add((int)Agl.PixelFormatAttribute.AGL_STENCIL_SIZE);
attribs.Add(stencil);
}
if (accum.BitsPerPixel > 0)
{
attribs.Add((int)Agl.PixelFormatAttribute.AGL_ACCUM_ALPHA_SIZE);
attribs.Add(accum.Alpha);
attribs.Add((int)Agl.PixelFormatAttribute.AGL_ACCUM_BLUE_SIZE);
attribs.Add(accum.Blue);
attribs.Add((int)Agl.PixelFormatAttribute.AGL_ACCUM_GREEN_SIZE);
attribs.Add(accum.Green);
attribs.Add((int)Agl.PixelFormatAttribute.AGL_ACCUM_RED_SIZE);
attribs.Add(accum.Red);
}
if (samples > 0)
{
attribs.Add((int)Agl.PixelFormatAttribute.AGL_SAMPLE_BUFFERS_ARB);
attribs.Add(1);
attribs.Add((int)Agl.PixelFormatAttribute.AGL_SAMPLES_ARB);
attribs.Add(samples);
}
if (stereo)
{
attribs.Add((int)Agl.PixelFormatAttribute.AGL_STEREO);
}
attribs.Add(0);
attribs.Add(0);
IntPtr pixelformat = Agl.aglChoosePixelFormat(IntPtr.Zero, 0, attribs.ToArray());
return pixelformat;
}
#endregion
}
}