protected override void OnCreateControl()
{
base.OnCreateControl();
int samples = 16;
int pixelFormat = GetAAPixelFormat(ref samples);
PIXELFORMATDESCRIPTOR pfd = new PIXELFORMATDESCRIPTOR();
pfd.nSize = (ushort)Marshal.SizeOf(typeof(PIXELFORMATDESCRIPTOR));
pfd.nVersion = 1;
pfd.dwFlags = PixelFlag.PFD_DRAW_TO_WINDOW | PixelFlag.PFD_SUPPORT_OPENGL | PixelFlag.PFD_DOUBLEBUFFER;
pfd.iPixelType = PixelType.PFD_TYPE_RGBA;
pfd.cColorBits = 32;
m_hDC = GDI.GetDC(Handle);
GDI.SetPixelFormat(m_hDC, pixelFormat, ref pfd);
m_hRC = WGL.wglCreateContext(m_hDC);
WGL.wglMakeCurrent(m_hDC, m_hRC);
}
static private int GetAAPixelFormat(ref int samples)
{
PIXELFORMATDESCRIPTOR pfd = new PIXELFORMATDESCRIPTOR();
pfd.nSize = (ushort)Marshal.SizeOf(typeof(PIXELFORMATDESCRIPTOR));
pfd.nVersion = 1;
pfd.dwFlags = PixelFlag.PFD_DRAW_TO_WINDOW | PixelFlag.PFD_SUPPORT_OPENGL | PixelFlag.PFD_DOUBLEBUFFER;
pfd.iPixelType = PixelType.PFD_TYPE_RGBA;
pfd.cColorBits = 32;
IntPtr dummyHWnd = GDI.CreateWindowEx(0, s_dummyClass, "", GDI.WindowStyles.WS_OVERLAPPEDWINDOW, 0, 0, 0, 0, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero);
IntPtr dummyHDc = GDI.GetDC(dummyHWnd);
int dummyPF = GDI.ChoosePixelFormat(dummyHDc, ref pfd);
GDI.SetPixelFormat(dummyHDc, dummyPF, ref pfd);
IntPtr dummyHRc = WGL.wglCreateContext(dummyHDc);
WGL.wglMakeCurrent(dummyHDc, dummyHRc);
int[] iattrs = new int[] {
WGL.WGL_DRAW_TO_WINDOW_ARB, 1,
WGL.WGL_ACCELERATION_ARB, WGL.WGL_FULL_ACCELERATION_ARB,
WGL.WGL_COLOR_BITS_ARB, 24,
WGL.WGL_ALPHA_BITS_ARB, 8,
WGL.WGL_DEPTH_BITS_ARB, 24,
WGL.WGL_STENCIL_BITS_ARB, 8,
WGL.WGL_DOUBLE_BUFFER_ARB, 1,
WGL.WGL_SAMPLE_BUFFERS_ARB, 1,
WGL.WGL_SAMPLES_ARB, 0,
0, 0
};
WGL.wglChoosePixelFormatARBHandler wglChoosePixelFormatARB = (WGL.wglChoosePixelFormatARBHandler)WGL.GetProc <WGL.wglChoosePixelFormatARBHandler>("wglChoosePixelFormatARB");
int pixelFormat = 0;
if (wglChoosePixelFormatARB != null)
{
int reqSamples;
for (reqSamples = samples; reqSamples > 0; reqSamples /= 2)
{
iattrs[17] = reqSamples;
int[] pixelFormats = new int[16];
int numFormats;
unsafe
{
fixed(int *pPixelFormats = pixelFormats)
{
fixed(int *pIAttrs = iattrs)
{
int success = wglChoosePixelFormatARB(
dummyHDc,
pIAttrs, (float *)0, 16,
pPixelFormats, &numFormats);
if (success != 0 && numFormats > 0)
{
pixelFormat = pixelFormats[0];
samples = reqSamples;
break;
}
}
}
}
}
}
else
{
samples = 1;
pixelFormat = GDI.ChoosePixelFormat(dummyHDc, ref pfd);
}
WGL.wglMakeCurrent(dummyHDc, dummyHRc);
WGL.wglDeleteContext(dummyHRc);
GDI.ReleaseDC(dummyHWnd, dummyHDc);
GDI.DestroyWindow(dummyHWnd);
return(pixelFormat);
}