public WglContext()
{
var iAttrs = new int[]
{
Wgl.WGL_ACCELERATION_ARB, Wgl.WGL_FULL_ACCELERATION_ARB,
Wgl.WGL_DRAW_TO_WINDOW_ARB, Wgl.TRUE,
//Wgl.WGL_DOUBLE_BUFFER_ARB, (doubleBuffered ? TRUE : FALSE),
Wgl.WGL_SUPPORT_OPENGL_ARB, Wgl.TRUE,
Wgl.WGL_RED_BITS_ARB, 8,
Wgl.WGL_GREEN_BITS_ARB, 8,
Wgl.WGL_BLUE_BITS_ARB, 8,
Wgl.WGL_ALPHA_BITS_ARB, 8,
Wgl.WGL_STENCIL_BITS_ARB, 8,
Wgl.NONE, Wgl.NONE
};
var piFormats = new int[1];
uint nFormats;
lock (fLock)
{
// HACK: This call seems to cause deadlocks on some systems.
Wgl.wglChoosePixelFormatARB(fDeviceContext, iAttrs, null, (uint)piFormats.Length, piFormats, out nFormats);
}
if (nFormats == 0)
{
Destroy();
throw new Exception("Could not get pixel formats.");
}
fPbuffer = Wgl.wglCreatePbufferARB(fDeviceContext, piFormats[0], 1, 1, null);
if (fPbuffer == IntPtr.Zero)
{
Destroy();
throw new Exception("Could not create Pbuffer.");
}
fPbufferDC = Wgl.wglGetPbufferDCARB(fPbuffer);
if (fPbufferDC == IntPtr.Zero)
{
Destroy();
throw new Exception("Could not get Pbuffer DC.");
}
var prevDC = Wgl.wglGetCurrentDC();
var prevGLRC = Wgl.wglGetCurrentContext();
fPbufferGlContext = Wgl.wglCreateContext(fPbufferDC);
Wgl.wglMakeCurrent(prevDC, prevGLRC);
if (fPbufferGlContext == IntPtr.Zero)
{
Destroy();
throw new Exception("Could not creeate Pbuffer GL context.");
}
}
public WglContext()
{
var wc = new WNDCLASS
{
cbClsExtra = 0,
cbWndExtra = 0,
hbrBackground = IntPtr.Zero,
hCursor = User32.LoadCursor(IntPtr.Zero, (int)User32.IDC_ARROW),
hIcon = User32.LoadIcon(IntPtr.Zero, (IntPtr)User32.IDI_APPLICATION),
hInstance = Kernel32.CurrentModuleHandle,
lpfnWndProc = (WNDPROC)User32.DefWindowProc,
lpszClassName = "Griffin",
lpszMenuName = null,
style = User32.CS_HREDRAW | User32.CS_VREDRAW | User32.CS_OWNDC
};
gWC = User32.RegisterClass(ref wc);
if (gWC == 0)
{
throw new Exception("Could not register window class.");
}
fWindow = User32.CreateWindow(
"Griffin",
"The Invisible Man",
WindowStyles.WS_OVERLAPPEDWINDOW,
0, 0,
1, 1,
IntPtr.Zero, IntPtr.Zero, Kernel32.CurrentModuleHandle, IntPtr.Zero);
if (fWindow == IntPtr.Zero)
{
throw new Exception($"Could not create window.");
}
fDeviceContext = User32.GetDC(fWindow);
if (fDeviceContext == IntPtr.Zero)
{
Destroy();
throw new Exception("Could not get device context.");
}
if (!Wgl.HasExtension(fDeviceContext, "WGL_ARB_pixel_format") ||
!Wgl.HasExtension(fDeviceContext, "WGL_ARB_pbuffer"))
{
Destroy();
throw new Exception("DC does not have extensions.");
}
var iAttrs = new int[]
{
Wgl.WGL_ACCELERATION_ARB, Wgl.WGL_FULL_ACCELERATION_ARB,
Wgl.WGL_DRAW_TO_WINDOW_ARB, Wgl.TRUE,
//Wgl.WGL_DOUBLE_BUFFER_ARB, (doubleBuffered ? TRUE : FALSE),
Wgl.WGL_SUPPORT_OPENGL_ARB, Wgl.TRUE,
Wgl.WGL_RED_BITS_ARB, 8,
Wgl.WGL_GREEN_BITS_ARB, 8,
Wgl.WGL_BLUE_BITS_ARB, 8,
Wgl.WGL_ALPHA_BITS_ARB, 8,
Wgl.WGL_STENCIL_BITS_ARB, 8,
Wgl.NONE, Wgl.NONE
};
var piFormats = new int[1];
uint nFormats;
Wgl.wglChoosePixelFormatARB(fDeviceContext, iAttrs, null, (uint)piFormats.Length, piFormats, out nFormats);
if (nFormats == 0)
{
Destroy();
throw new Exception("Could not get pixel formats.");
}
fPbuffer = Wgl.wglCreatePbufferARB(fDeviceContext, piFormats[0], 1, 1, null);
if (fPbuffer == IntPtr.Zero)
{
Destroy();
throw new Exception("Could not create Pbuffer.");
}
fPbufferDC = Wgl.wglGetPbufferDCARB(fPbuffer);
if (fPbufferDC == IntPtr.Zero)
{
Destroy();
throw new Exception("Could not get Pbuffer DC.");
}
var prevDC = Wgl.wglGetCurrentDC();
var prevGLRC = Wgl.wglGetCurrentContext();
fPbufferGlContext = Wgl.wglCreateContext(fPbufferDC);
Wgl.wglMakeCurrent(prevDC, prevGLRC);
if (fPbufferGlContext == IntPtr.Zero)
{
Destroy();
throw new Exception("Could not creeate Pbuffer GL context.");
}
}
