/// <summary>
/// Create a simple context.
/// </summary>
/// <returns>
/// A <see cref="IntPtr"/> that represents the handle of the created context. If the context cannot be
/// created, it returns IntPtr.Zero.
/// </returns>
internal override IntPtr CreateSimpleContext()
{
IntPtr rContext;
// Define most compatible pixel format
Wgl.PIXELFORMATDESCRIPTOR pfd = new Wgl.PIXELFORMATDESCRIPTOR(24);
int pFormat;
bool res;
// Find pixel format match
pfd.dwFlags |= Wgl.PixelFormatDescriptorFlags.DepthDontCare | Wgl.PixelFormatDescriptorFlags.DoublebufferDontCare | Wgl.PixelFormatDescriptorFlags.StereoDontCare;
pFormat = Wgl.ChoosePixelFormat(_DeviceContext, ref pfd);
Debug.Assert(pFormat != 0);
// Get exact description of the pixel format
res = Wgl.DescribePixelFormat(_DeviceContext, pFormat, (uint)pfd.nSize, ref pfd);
Debug.Assert(res);
// Set pixel format before creating OpenGL context
res = Wgl.SetPixelFormat(_DeviceContext, pFormat, ref pfd);
Debug.Assert(res);
// Create a dummy OpenGL context to retrieve initial informations.
rContext = CreateContext(IntPtr.Zero);
Debug.Assert(rContext != IntPtr.Zero);
return(rContext);
}
