unsafe void InitPixelFormat(IntPtr hdc)
{
// pfd Tells Windows How We Want Things To Be
var pfd = new PixelformatDescriptor
{
nSize = (ushort)Marshal.SizeOf <PixelformatDescriptor> (), // size of this pfd
nVersion = 1, // version number
dwFlags = PFD_FLAGS.DRAW_TO_WINDOW | PFD_FLAGS.SUPPORT_OPENGL | PFD_FLAGS.DOUBLEBUFFER, // support window, OpenGL, double buffered
iPixelType = PFD_PIXEL_TYPE.RGBA, // RGBA type
cColorBits = 24, // 24-bit color depth
cRedBits = 0,
cRedShift = 0,
cGreenBits = 0,
cGreenShift = 0,
cBlueBits = 0,
cBlueShift = 0, // color bits ignored
cAlphaBits = 0, // no alpha buffer
cAlphaShift = 0, // shift bit ignored
cAccumBits = 0, // no accumulation buffer
cAccumRedBits = 0,
cAccumGreenBits = 0,
cAccumBlueBits = 0,
cAccumAlphaBits = 0, // accum bits ignored
cDepthBits = 32, // 16-bit z-buffer
cStencilBits = 0, // no stencil buffer
cAuxBuffers = 0, // no auxiliary buffer
iLayerType = PFD_LAYER_TYPES.MAIN_PLANE, // main layer
bReserved = 0, // reserved
dwLayerMask = 0,
dwVisibleMask = 0,
dwDamageMask = 0 // layer masks ignored
};
int iPixelFormat = wgl.ChoosePixelFormat(hdc, (IntPtr)(&pfd));
// get the device context's best, available pixel format match
if (iPixelFormat == 0)
{
//MessageBox::Show ( "ChoosePixelFormat Failed" );
return;
}
if (wgl.SetPixelFormat(hdc, iPixelFormat, (IntPtr)(&pfd)) == false)
{
//MessageBox::Show ( "SetPixelFormat Failed" );
return;
}
renderContext = wgl.CreateContext(hdc);
if (renderContext == IntPtr.Zero)
{
//MessageBox::Show ( "wglCreateContext Failed" );
return;
}
if ((wgl.MakeCurrent(hdc, renderContext)) == false)
{
//MessageBox::Show ( "wglMakeCurrent Failed" );
return;
}
}
private void CreateOpenGLContext(IntPtr hwnd)
{
this.hwnd = hwnd;
this.hDC = GetDC(hwnd);
var pixelformatdescriptor = new PIXELFORMATDESCRIPTOR();
pixelformatdescriptor.Init();
#if !USE_MSAA
int pixelFormat;
pixelFormat = ChoosePixelFormat(this.hDC, ref pixelformatdescriptor);
SetPixelFormat(this.hDC, pixelFormat, ref pixelformatdescriptor);
this.hglrc = wglCreateContext(this.hDC);
wglMakeCurrent(this.hDC, this.hglrc);
#else
IntPtr tempContext = IntPtr.Zero;
IntPtr tempHwnd = IntPtr.Zero;
//Create temporary window
IntPtr hInstance = Process.GetCurrentProcess().SafeHandle.DangerousGetHandle();
WNDCLASS wndclass = new WNDCLASS()
{
style = 0x0002 /*CS_HREDRAW*/ | 0x0001 /*CS_VREDRAW*/ | 0x0020 /*CS_OWNDC*/,
lpfnWndProc = (hWnd, msg, wParam, lParam) => DefWindowProc(hWnd, msg, wParam, lParam),
hInstance = hInstance,
lpszClassName = "tmpWindowForMSAA~" + this.GetHashCode()
};
ushort atom = RegisterClassW(ref wndclass);
if (atom == 0)
{
throw new WindowCreateException(string.Format("RegisterClass error: {0}", Marshal.GetLastWin32Error()));
}
tempHwnd = CreateWindowEx(
0,
new IntPtr(atom),
"tmpWindow~",
(uint)(WindowStyles.WS_CLIPSIBLINGS | WindowStyles.WS_CLIPCHILDREN),
0, 0, 1, 1, hwnd, IntPtr.Zero,
hInstance,
IntPtr.Zero);
if (tempHwnd == IntPtr.Zero)
{
throw new WindowCreateException(string.Format("CreateWindowEx for tempContext error: {0}", Marshal.GetLastWin32Error()));
}
IntPtr tempHdc = GetDC(tempHwnd);
var tempPixelFormat = ChoosePixelFormat(tempHdc, ref pixelformatdescriptor);
if (tempPixelFormat == 0)
{
throw new Exception(string.Format("ChoosePixelFormat failed: error {0}", Marshal.GetLastWin32Error()));
}
if (!SetPixelFormat(tempHdc, tempPixelFormat, ref pixelformatdescriptor))
{
throw new Exception(string.Format("SetPixelFormat failed: error {0}", Marshal.GetLastWin32Error()));
}
tempContext = Wgl.CreateContext(tempHdc);//Crate temp context to load entry points
if (tempContext == IntPtr.Zero)
{
throw new Exception(string.Format("wglCreateContext for tempHdc failed: error {0}", Marshal.GetLastWin32Error()));
}
if (!Wgl.MakeCurrent(tempHdc, tempContext))
{
throw new Exception(string.Format("wglMakeCurrent for tempContext failed: error {0}", Marshal.GetLastWin32Error()));
}
//load wgl entry points for wglChoosePixelFormatARB
new Wgl().LoadEntryPoints(tempHdc);
int[] iPixAttribs =
{
(int)WGL.WGL_SUPPORT_OPENGL_ARB, (int)GL.GL_TRUE,
(int)WGL.WGL_DRAW_TO_WINDOW_ARB, (int)GL.GL_TRUE,
(int)WGL.WGL_DOUBLE_BUFFER_ARB, (int)GL.GL_TRUE,
(int)WGL.WGL_PIXEL_TYPE_ARB, (int)WGL.WGL_TYPE_RGBA_ARB,
(int)WGL.WGL_ACCELERATION_ARB, (int)WGL.WGL_FULL_ACCELERATION_ARB,
(int)WGL.WGL_COLOR_BITS_ARB, 32,
(int)WGL.WGL_DEPTH_BITS_ARB, 24,
(int)WGL.WGL_STENCIL_BITS_ARB, 8,
(int)WGL.WGL_SWAP_METHOD_ARB, (int)WGL.WGL_SWAP_EXCHANGE_ARB,
(int)WGL.WGL_SAMPLE_BUFFERS_ARB, (int)GL.GL_TRUE,//Enable MSAA
(int)WGL.WGL_SAMPLES_ARB, 16,
0
};
int pixelFormat;
uint numFormats;
var result = Wgl.ChoosePixelFormatARB(this.hDC, iPixAttribs, null, 1, out pixelFormat, out numFormats);
if (result == false || numFormats == 0)
{
throw new Exception(string.Format("wglChoosePixelFormatARB failed: error {0}", Marshal.GetLastWin32Error()));
}
if (!DescribePixelFormat(this.hDC, pixelFormat, (uint)Marshal.SizeOf <PIXELFORMATDESCRIPTOR>(), ref pixelformatdescriptor))
{
throw new Exception(string.Format("DescribePixelFormat failed: error {0}", Marshal.GetLastWin32Error()));
}
if (!SetPixelFormat(this.hDC, pixelFormat, ref pixelformatdescriptor))
{
throw new Exception(string.Format("SetPixelFormat failed: error {0}", Marshal.GetLastWin32Error()));
}
if ((this.hglrc = wglCreateContext(this.hDC)) == IntPtr.Zero)
{
throw new Exception(string.Format("wglCreateContext failed: error {0}", Marshal.GetLastWin32Error()));
}
Wgl.MakeCurrent(IntPtr.Zero, IntPtr.Zero);
Wgl.DeleteContext(tempContext);
ReleaseDC(tempHwnd, tempHdc);
DestroyWindow(tempHwnd);
if (!wglMakeCurrent(this.hDC, this.hglrc))
{
throw new Exception(string.Format("wglMakeCurrent failed: error {0}", Marshal.GetLastWin32Error()));
}
Utility.CheckGLError();
#endif
GL.GetIntegerv(GL.GL_STENCIL_BITS, IntBuffer);
var stencilBits = IntBuffer[0];
if (stencilBits != 8)
{
throw new Exception("Failed to set stencilBits to 9.");
}
PrintGraphicInfo();
}
/// <summary>
/// Initialize WGL functions
/// </summary>
/// <param name="mainWindowHwnd"></param>
/// <remarks>
/// //refer to
/// https://github.com/glfw/glfw/blob/3327050ca66ad34426a82c217c2d60ced61526b7/src/wgl_context.c#L408
/// </remarks>
internal static void Init(IntPtr mainWindowHwnd)
{
if (EntryPoints != null)//already initialized
{
return;
}
IntPtr tempContext = IntPtr.Zero;
IntPtr tempHwnd = IntPtr.Zero;
//Create temporary window
IntPtr hInstance = Process.GetCurrentProcess().SafeHandle.DangerousGetHandle();
WNDCLASS wndclass = new WNDCLASS()
{
style = 0x0002 /*CS_HREDRAW*/ | 0x0001 /*CS_VREDRAW*/ | 0x0020 /*CS_OWNDC*/,
lpfnWndProc = (hWnd, msg, wParam, lParam) => DefWindowProc(hWnd, msg, wParam, lParam),
hInstance = hInstance,
lpszClassName = "tmpWindowForMSAA~" + tempHwnd.GetHashCode()
};
ushort atom = RegisterClassW(ref wndclass);
if (atom == 0)
{
throw new WindowCreateException(string.Format("RegisterClass error: {0}", Marshal.GetLastWin32Error()));
}
//TODO wgl entry point only need to be loaded once!
tempHwnd = CreateWindowEx(
0,
new IntPtr(atom),
"tmpWindow~",
(uint)(WindowStyles.WS_CLIPSIBLINGS | WindowStyles.WS_CLIPCHILDREN),
0, 0, 1, 1, mainWindowHwnd, IntPtr.Zero,
hInstance,
IntPtr.Zero);
if (tempHwnd == IntPtr.Zero)
{
throw new WindowCreateException(string.Format("CreateWindowEx for tempContext error: {0}", Marshal.GetLastWin32Error()));
}
IntPtr tempHdc = GetDC(tempHwnd);
var pixelformatdescriptor = new PIXELFORMATDESCRIPTOR();
pixelformatdescriptor.Init();
var tempPixelFormat = ChoosePixelFormat(tempHdc, ref pixelformatdescriptor);
if (tempPixelFormat == 0)
{
throw new Exception(string.Format("ChoosePixelFormat failed: error {0}", Marshal.GetLastWin32Error()));
}
if (!SetPixelFormat(tempHdc, tempPixelFormat, ref pixelformatdescriptor))
{
throw new Exception(string.Format("SetPixelFormat failed: error {0}", Marshal.GetLastWin32Error()));
}
tempContext = Wgl.CreateContext(tempHdc);//Crate temp context to load entry points
if (tempContext == IntPtr.Zero)
{
throw new Exception(string.Format("wglCreateContext for tempHdc failed: error {0}", Marshal.GetLastWin32Error()));
}
if (!Wgl.MakeCurrent(tempHdc, tempContext))
{
throw new Exception(string.Format("wglMakeCurrent for tempContext failed: error {0}", Marshal.GetLastWin32Error()));
}
//load wgl entry points for wglChoosePixelFormatARB
new Wgl().LoadEntryPoints(tempHdc);
Wgl.MakeCurrent(IntPtr.Zero, IntPtr.Zero);
Wgl.DeleteContext(tempContext);
ReleaseDC(tempHwnd, tempHdc);
DestroyWindow(tempHwnd);
}
