public WinGLContext(GraphicsMode format, WinWindow window)
{
Debug.Print("OpenGL will be bound to handle: {0}", window.WinHandle);
SelectGraphicsModePFD(format, window);
Debug.Print("Setting pixel format... ");
SetGraphicsModePFD(format, window);
ContextHandle = Wgl.wglCreateContext(window.DeviceContext);
if (ContextHandle == IntPtr.Zero)
{
ContextHandle = Wgl.wglCreateContext(window.DeviceContext);
}
if (ContextHandle == IntPtr.Zero)
{
throw new GraphicsContextException("Context creation failed. Error: " + Marshal.GetLastWin32Error());
}
if (!Wgl.wglMakeCurrent(window.DeviceContext, ContextHandle))
{
throw new GraphicsContextException("Failed to make context current. " +
"Error: " + Marshal.GetLastWin32Error());
}
dc = Wgl.wglGetCurrentDC();
Wgl.LoadEntryPoints();
vsync_supported = Wgl.wglSwapIntervalEXT != null;
}
void SetGraphicsModePFD(GraphicsMode mode, WinWindow window)
{
// Find out what we really got as a format:
IntPtr deviceContext = window.DeviceContext;
PixelFormatDescriptor pfd = new PixelFormatDescriptor();
pfd.Size = PixelFormatDescriptor.DefaultSize;
pfd.Version = PixelFormatDescriptor.DefaultVersion;
API.DescribePixelFormat(deviceContext, modeIndex, pfd.Size, ref pfd);
Debug.Print("WGL mode index: " + modeIndex.ToString());
if (!API.SetPixelFormat(window.DeviceContext, modeIndex, ref pfd))
{
throw new GraphicsContextException("SetPixelFormat failed. " +
"Error: " + Marshal.GetLastWin32Error());
}
}
void SelectGraphicsModePFD(GraphicsMode format, WinWindow window)
{
IntPtr deviceContext = window.DeviceContext;
Debug.Print("Device context: {0}", deviceContext);
ColorFormat color = format.ColorFormat;
Debug.Print("Selecting pixel format PFD... ");
PixelFormatDescriptor pfd = new PixelFormatDescriptor();
pfd.Size = PixelFormatDescriptor.DefaultSize;
pfd.Version = PixelFormatDescriptor.DefaultVersion;
pfd.Flags =
PixelFormatDescriptorFlags.SUPPORT_OPENGL |
PixelFormatDescriptorFlags.DRAW_TO_WINDOW;
pfd.ColorBits = (byte)(color.Red + color.Green + color.Blue);
pfd.PixelType = color.IsIndexed ? PixelType.INDEXED : PixelType.RGBA;
pfd.RedBits = (byte)color.Red;
pfd.GreenBits = (byte)color.Green;
pfd.BlueBits = (byte)color.Blue;
pfd.AlphaBits = (byte)color.Alpha;
pfd.DepthBits = (byte)format.Depth;
pfd.StencilBits = (byte)format.Stencil;
if (format.Depth <= 0)
{
pfd.Flags |= PixelFormatDescriptorFlags.DEPTH_DONTCARE;
}
if (format.Buffers > 1)
{
pfd.Flags |= PixelFormatDescriptorFlags.DOUBLEBUFFER;
}
modeIndex = API.ChoosePixelFormat(deviceContext, ref pfd);
if (modeIndex == 0)
{
throw new GraphicsModeException("The requested GraphicsMode is not available.");
}
}
