public void SetRenderingWindow(IWindow window)
{
if (hglrc == IntPtr.Zero)
{
throw new InvalidOperationException("OpenGL context hasn't been created.");
}
var dc = GetDC(window.Pointer);
hDC = dc;
//For OpenGL, we need to set pixel format for each win32 window before make it current.
if (GetPixelFormat(dc) == 0)//Set a valid pixel format if haven't.
{
var pixelformatdescriptor = new PIXELFORMATDESCRIPTOR();
pixelformatdescriptor.Init();
if (!Application.EnableMSAA)
{
int pixelFormat = ChoosePixelFormat(dc, ref pixelformatdescriptor);
SetPixelFormat(dc, pixelFormat, ref pixelformatdescriptor);
}
else
{
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 result1 = Wgl.ChoosePixelFormatARB(dc, iPixAttribs, null, 1, out pixelFormat,
out numFormats);
if (result1 == false || numFormats == 0)
{
throw new Exception(
$"wglChoosePixelFormatARB failed: error {Marshal.GetLastWin32Error()}");
}
if (!DescribePixelFormat(dc, pixelFormat, (uint)Marshal.SizeOf <PIXELFORMATDESCRIPTOR>(),
ref pixelformatdescriptor))
{
throw new Exception(
$"DescribePixelFormat failed: error {Marshal.GetLastWin32Error()}");
}
if (!SetPixelFormat(dc, pixelFormat, ref pixelformatdescriptor))
{
throw new Exception(
$"SetPixelFormat failed: error {Marshal.GetLastWin32Error()}");
}
}
}
var result = Wgl.MakeCurrent(dc, hglrc);
if (!result)
{
var lastError = Native.GetLastErrorString();
PrintPixelFormat(dc);
throw new InvalidOperationException($"Wgl.MakeCurrent failed, error: {lastError}");
}
var viewportSize = window.ClientSize;
GL.Viewport(0, 0, (int)viewportSize.Width, (int)viewportSize.Height);
GL.Scissor(0, 0, (int)viewportSize.Width, (int)viewportSize.Height);
}