private void OnRealized(object sender, EventArgs eventArgs)
{
WGL.GetCurrentDC();
IntPtr wh = Utils.GetGDKWindowHandle(Window.Handle);
if (wh == IntPtr.Zero)
{
throw new NotSupportedException("Failed to get the native window handle.");
}
IntPtr dc = GraphicsManager.GetDeviceContext(wh);
if (dc == IntPtr.Zero)
{
throw new NotSupportedException("Failed to get the device context. OpenGL not supported");
}
try
{
WGL.PixelFormatDescriptor pfd = WGL.PixelFormatDescriptor.Default;
int pf = GraphicsManager.ChoosePixelFormat(dc, ref pfd);
if (pf == 0)
{
throw new NotSupportedException("OpenGL not supported. Can't find a pixel format.");
}
if (GraphicsManager.DescribePixelFormat(dc, pf, (uint)pfd.nSize, out pfd) == 0)
{
throw new NotSupportedException("OpenGL not supported. Couldn't retrieve informations about a pixel format.");
}
if (pfd.dwFlags.HasFlag(WGL.PixelFormatDescriptorFlags.GenericFormat))
{
WGL.PixelFormatDescriptor checkpfd;
// First pixel format should be a ICD. Generic implentation comes later.
if (GraphicsManager.DescribePixelFormat(dc, 1, (uint)pfd.nSize, out checkpfd) == 0)
{
throw new NotSupportedException("OpenGL not supported. Couldn't retrieve informations about a pixel format.");
}
if (checkpfd.dwFlags.HasFlag(WGL.PixelFormatDescriptorFlags.GenericFormat))
{
throw new NotSupportedException("OpenGL not supported. Not ICD (hardware renderer) found.");
}
pf = 1;
pfd = checkpfd;
}
if (!GraphicsManager.SetPixelFormat(dc, pf, ref pfd))
{
throw new NotSupportedException("OpenGL not supported. Couldn't initialize pixel format.");
}
IntPtr rc = GraphicsManager.CreateContext(dc);
if (rc == IntPtr.Zero)
{
throw new NotSupportedException($"Failed to create a render context. OpenGL not supported. {Marshal.GetLastWin32Error()}");
}
try
{
if (!GraphicsManager.MakeCurrent(dc, rc))
{
throw new NotSupportedException("Failed to make the render context current. OpenGL not supported");
}
GL.LoadOpenGL();
if (!GraphicsManager.ClearCurrentContext())
{
throw new NotSupportedException("Can't clear the current context. OpenGL not supported");
}
}
finally
{
if (!GraphicsManager.DeleteContext(rc))
{
throw new NotSupportedException("Failed to delete the render context. OpenGL not supported.");
}
}
}
finally
{
if (!GraphicsManager.ReleaseDeviceContext(wh, dc))
{
throw new NotSupportedException("Failed to release the device context. OpenGL not supported.");
}
Close();
}
}