// Queries pixel formats through the WGL_ARB_pixel_format extension
// This method only returns accelerated formats. If no format offers
// hardware acceleration (e.g. we are running in a VM or in a remote desktop
// connection), this method will return 0 formats and we will fall back to
// ChoosePixelFormatPFD.
private GraphicsMode ChoosePixelFormatARB(IntPtr device, GraphicsMode desired_mode)
{
GraphicsMode created_mode = null;
GraphicsMode mode = new GraphicsMode(desired_mode);
if (Wgl.SupportsExtension("WGL_ARB_pixel_format") &&
Wgl.SupportsFunction("wglChoosePixelFormatARB"))
{
int[] format = new int[1];
List <int> attributes = new List <int>();
bool retry = false;
do
{
attributes.Clear();
attributes.Add((int)WGL_ARB_pixel_format.AccelerationArb);
attributes.Add((int)WGL_ARB_pixel_format.FullAccelerationArb);
attributes.Add((int)WGL_ARB_pixel_format.DrawToWindowArb);
attributes.Add(1);
if (mode.ColorFormat.Red > 0)
{
attributes.Add((int)WGL_ARB_pixel_format.RedBitsArb);
attributes.Add(mode.ColorFormat.Red);
}
if (mode.ColorFormat.Green > 0)
{
attributes.Add((int)WGL_ARB_pixel_format.GreenBitsArb);
attributes.Add(mode.ColorFormat.Green);
}
if (mode.ColorFormat.Blue > 0)
{
attributes.Add((int)WGL_ARB_pixel_format.BlueBitsArb);
attributes.Add(mode.ColorFormat.Blue);
}
if (mode.ColorFormat.Alpha > 0)
{
attributes.Add((int)WGL_ARB_pixel_format.AlphaBitsArb);
attributes.Add(mode.ColorFormat.Alpha);
}
if (mode.Depth > 0)
{
attributes.Add((int)WGL_ARB_pixel_format.DepthBitsArb);
attributes.Add(mode.Depth);
}
if (mode.Stencil > 0)
{
attributes.Add((int)WGL_ARB_pixel_format.StencilBitsArb);
attributes.Add(mode.Stencil);
}
if (mode.AccumulatorFormat.Red > 0)
{
attributes.Add((int)WGL_ARB_pixel_format.AccumRedBitsArb);
attributes.Add(mode.AccumulatorFormat.Red);
}
if (mode.AccumulatorFormat.Green > 0)
{
attributes.Add((int)WGL_ARB_pixel_format.AccumGreenBitsArb);
attributes.Add(mode.AccumulatorFormat.Green);
}
if (mode.AccumulatorFormat.Blue > 0)
{
attributes.Add((int)WGL_ARB_pixel_format.AccumBlueBitsArb);
attributes.Add(mode.AccumulatorFormat.Blue);
}
if (mode.AccumulatorFormat.Alpha > 0)
{
attributes.Add((int)WGL_ARB_pixel_format.AccumAlphaBitsArb);
attributes.Add(mode.AccumulatorFormat.Alpha);
}
if (mode.Samples > 0 &&
Wgl.SupportsExtension("WGL_ARB_multisample"))
{
attributes.Add((int)WGL_ARB_multisample.SampleBuffersArb);
attributes.Add(1);
attributes.Add((int)WGL_ARB_multisample.SamplesArb);
attributes.Add(mode.Samples);
}
if (mode.Buffers > 0)
{
attributes.Add((int)WGL_ARB_pixel_format.DoubleBufferArb);
attributes.Add(mode.Buffers > 1 ? 1 : 0);
}
if (mode.Stereo)
{
attributes.Add((int)WGL_ARB_pixel_format.StereoArb);
attributes.Add(1);
}
attributes.Add(0);
attributes.Add(0);
uint count = (uint)attributes.Count;
if (Wgl.wglChoosePixelFormatARB(device, attributes.ToArray(), null, (uint)format.Length, format, ref count) &&
count > 0)
{
created_mode = DescribePixelFormatARB(device, format[0]);
retry = false;
}
else
{
Debug.Print("[WGL] ChoosePixelFormatARB failed with {0}", Marshal.GetLastWin32Error());
retry = Utilities.RelaxGraphicsMode(ref mode);
}
}while (retry);
}
else
{
Debug.WriteLine("[WGL] ChoosePixelFormatARB not supported on this context");
}
return(created_mode);
}