private void CreateOpenGLContext(IntPtr hwnd)
{
this.hwnd = hwnd;
this.hDC = GetDC(hwnd);
var pixelformatdescriptor = new PIXELFORMATDESCRIPTOR();
pixelformatdescriptor.Init();
if (!Application.EnableMSAA)
{
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, 24,
(int)WGL.WGL_ALPHA_BITS_ARB, 8,
(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()));
}
int[] attributes =
{
(int)WGL.WGL_CONTEXT_MAJOR_VERSION_ARB, 4,
(int)WGL.WGL_CONTEXT_MINOR_VERSION_ARB, 5,
(int)WGL.WGL_CONTEXT_FLAGS_ARB, 0,
(int)WGL.WGL_CONTEXT_PROFILE_MASK_ARB, (int)WGL.WGL_CONTEXT_CORE_PROFILE_BIT_ARB
, 0
};
if ((this.hglrc = Wgl.CreateContextAttribsARB(this.hDC, IntPtr.Zero, attributes)) == IntPtr.Zero)
{
throw new Exception(string.Format("CreateContextAttribsARB 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();
}
GL.GetFramebufferAttachmentParameteriv(GL.GL_DRAW_FRAMEBUFFER,
GL.GL_STENCIL, GL.GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE, IntBuffer);
Utility.CheckGLError();
var stencilBits = IntBuffer[0];
if (stencilBits != 8)
{
throw new Exception("Failed to set stencilBits to 8.");
}
PrintGraphicInfo();
}
private void CreateOpenGLContext(IntPtr hwnd)
{
this.hwnd = hwnd;
this.hDC = GetDC(hwnd);
var pixelformatdescriptor = new PIXELFORMATDESCRIPTOR();
pixelformatdescriptor.Init();
if (!Application.EnableMSAA)
{
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
{
Wgl.Init(hwnd);
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, 24,
(int)WGL.WGL_ALPHA_BITS_ARB, 8,
(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()));
}
int[] attributes =
{
(int)WGL.WGL_CONTEXT_MAJOR_VERSION_ARB, 4,
(int)WGL.WGL_CONTEXT_MINOR_VERSION_ARB, 5,
(int)WGL.WGL_CONTEXT_FLAGS_ARB, 0,
(int)WGL.WGL_CONTEXT_PROFILE_MASK_ARB, (int)WGL.WGL_CONTEXT_CORE_PROFILE_BIT_ARB
, 0
};
if ((this.hglrc = Wgl.CreateContextAttribsARB(this.hDC, IntPtr.Zero, attributes)) == IntPtr.Zero)
{
throw new Exception(string.Format("CreateContextAttribsARB failed: error {0}", Marshal.GetLastWin32Error()));
}
if (!Wgl.MakeCurrent(this.hDC, this.hglrc))
{
throw new Exception(string.Format("Wgl.MakeCurrent failed: error {0}", Marshal.GetLastWin32Error()));
}
Utility.CheckGLError();
}
int[] IntBuffer = { 0, 0, 0, 0 };
GL.GetFramebufferAttachmentParameteriv(GL.GL_DRAW_FRAMEBUFFER,
GL.GL_STENCIL, GL.GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE, IntBuffer);
Utility.CheckGLError();
var stencilBits = IntBuffer[0];
if (stencilBits != 8)
{
throw new Exception("Failed to set stencilBits to 8.");
}
PrintPixelFormat(hDC);
PrintGraphicInfo();
}
