GraphicsMode ChoosePixelFormatPFD(IntPtr device, GraphicsMode mode, AccelerationType requested_acceleration_type)
{
PixelFormatDescriptor pfd = new PixelFormatDescriptor();
PixelFormatDescriptorFlags flags = 0;
flags |= PixelFormatDescriptorFlags.DRAW_TO_WINDOW;
flags |= PixelFormatDescriptorFlags.SUPPORT_OPENGL;
if (mode.Stereo)
{
flags |= PixelFormatDescriptorFlags.STEREO;
}
if (System.Environment.OSVersion.Version.Major >= 6 &&
requested_acceleration_type != AccelerationType.None)
{
// Request a compositor-capable mode when running on
// Vista+ and using hardware acceleration. Without this,
// some modes will cause the compositor to turn off,
// which is very annoying to the user.
// Note: compositor-capable modes require hardware
// acceleration. Don't set this flag when running
// with software acceleration (e.g. over Remote Desktop
// as described in bug https://github.com/opentk/opentk/issues/35)
flags |= PixelFormatDescriptorFlags.SUPPORT_COMPOSITION;
}
int count = Functions.DescribePixelFormat(device, 1, API.PixelFormatDescriptorSize, ref pfd);
int best = 0;
int best_dist = int.MaxValue;
for (int index = 1; index <= count; index++)
{
int dist = 0;
bool valid = Functions.DescribePixelFormat(device, index, API.PixelFormatDescriptorSize, ref pfd) != 0;
valid &= GetAccelerationType(ref pfd) == requested_acceleration_type;
valid &= (pfd.Flags & flags) == flags;
valid &= pfd.PixelType == PixelType.RGBA; // indexed modes not currently supported
// heavily penalize single-buffered modes when the user requests double buffering
if ((pfd.Flags & PixelFormatDescriptorFlags.DOUBLEBUFFER) == 0 && mode.Buffers > 1)
{
dist += 1000;
}
valid &= Compare(pfd.ColorBits, mode.ColorFormat.BitsPerPixel, ref dist);
valid &= Compare(pfd.RedBits, mode.ColorFormat.Red, ref dist);
valid &= Compare(pfd.GreenBits, mode.ColorFormat.Green, ref dist);
valid &= Compare(pfd.BlueBits, mode.ColorFormat.Blue, ref dist);
valid &= Compare(pfd.AlphaBits, mode.ColorFormat.Alpha, ref dist);
valid &= Compare(pfd.AccumBits, mode.AccumulatorFormat.BitsPerPixel, ref dist);
valid &= Compare(pfd.AccumRedBits, mode.AccumulatorFormat.Red, ref dist);
valid &= Compare(pfd.AccumGreenBits, mode.AccumulatorFormat.Green, ref dist);
valid &= Compare(pfd.AccumBlueBits, mode.AccumulatorFormat.Blue, ref dist);
valid &= Compare(pfd.AccumAlphaBits, mode.AccumulatorFormat.Alpha, ref dist);
valid &= Compare(pfd.DepthBits, mode.Depth, ref dist);
valid &= Compare(pfd.StencilBits, mode.Stencil, ref dist);
if (valid && dist < best_dist)
{
best = index;
best_dist = dist;
}
}
return(DescribePixelFormatPFD(device, ref pfd, best));
}
private GraphicsMode ChoosePixelFormatPFD(IntPtr device, GraphicsMode mode,
AccelerationType requested_acceleration_type)
{
var pfd = new PixelFormatDescriptor();
PixelFormatDescriptorFlags flags = 0;
flags |= PixelFormatDescriptorFlags.DrawToWindow;
flags |= PixelFormatDescriptorFlags.SupportOpenGL;
if (mode.Stereo)
{
flags |= PixelFormatDescriptorFlags.Stereo;
}
if (Environment.OSVersion.Version.Major >= 6 &&
requested_acceleration_type != AccelerationType.None)
{
// Request a compositor-capable mode when running on
// Vista+ and using hardware acceleration. Without this,
// some modes will cause the compositor to turn off,
// which is very annoying to the user.
// Note: compositor-capable modes require hardware
// acceleration. Don't set this flag when running
// with software acceleration (e.g. over Remote Desktop
// as described in bug https://github.com/opentk/opentk/issues/35)
flags |= PixelFormatDescriptorFlags.SupportComposition;
}
var count = Gdi32.DescribePixelFormat(device, 1, PixelFormatDescriptor.SizeInBytes, ref pfd);
var best = 0;
var best_dist = int.MaxValue;
for (var index = 1; index <= count; index++)
{
var dist = 0;
var valid = Gdi32.DescribePixelFormat(device, index, PixelFormatDescriptor.SizeInBytes, ref pfd) != 0;
valid &= GetAccelerationType(ref pfd) == requested_acceleration_type;
valid &= (pfd.Flags & flags) == flags;
valid &= pfd.PixelType == PixelFormatDescriptorPixelTypes.Rgba; // indexed modes not currently supported
// heavily penalize single-buffered modes when the user requests double buffering
if ((pfd.Flags & PixelFormatDescriptorFlags.DoubleBuffer) == 0 && mode.Buffers > 1)
{
dist += 1000;
}
valid &= Compare(pfd.ColorBits, mode.ColorFormat.BitsPerPixel, ref dist);
valid &= Compare(pfd.RedBits, mode.ColorFormat.Red, ref dist);
valid &= Compare(pfd.GreenBits, mode.ColorFormat.Green, ref dist);
valid &= Compare(pfd.BlueBits, mode.ColorFormat.Blue, ref dist);
valid &= Compare(pfd.AlphaBits, mode.ColorFormat.Alpha, ref dist);
valid &= Compare(pfd.AccumBits, mode.AccumulatorFormat.BitsPerPixel, ref dist);
valid &= Compare(pfd.AccumRedBits, mode.AccumulatorFormat.Red, ref dist);
valid &= Compare(pfd.AccumGreenBits, mode.AccumulatorFormat.Green, ref dist);
valid &= Compare(pfd.AccumBlueBits, mode.AccumulatorFormat.Blue, ref dist);
valid &= Compare(pfd.AccumAlphaBits, mode.AccumulatorFormat.Alpha, ref dist);
valid &= Compare(pfd.DepthBits, mode.Depth, ref dist);
valid &= Compare(pfd.StencilBits, mode.Stencil, ref dist);
if (valid && dist < best_dist)
{
best = index;
best_dist = dist;
}
}
return(DescribePixelFormatPFD(device, ref pfd, best));
}
