public GLWidget(FramebufferFormat framebufferFormat, int major, int minor, OpenGLContextFlags flags = OpenGLContextFlags.Default, bool directRendering = true, OpenGLContextBase sharedContext = null)
{
FramebufferFormat = framebufferFormat;
GLVersionMajor = major;
GLVersionMinor = minor;
ContextFlags = flags;
DirectRendering = directRendering;
SharedContext = sharedContext;
}
public OpenGLContextBase(FramebufferFormat framebufferFormat, int major, int minor, OpenGLContextFlags flags, bool directRendering, OpenGLContextBase shareContext)
{
FramebufferFormat = framebufferFormat;
Major = major;
Minor = minor;
Flags = flags;
DirectRendering = directRendering;
ShareContext = shareContext;
}
public static OpenGLContextBase CreateOpenGLContext(FramebufferFormat framebufferFormat, int major, int minor, OpenGLContextFlags flags = OpenGLContextFlags.Default, bool directRendering = true, OpenGLContextBase shareContext = null)
{
if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
{
// TODO: detect X11/Wayland/DRI
if (shareContext != null && !(shareContext is GLXOpenGLContext))
{
throw new ContextException($"shared context must be of type {typeof(GLXOpenGLContext).Name}.");
}
return(new GLXOpenGLContext(framebufferFormat, major, minor, flags, directRendering, (GLXOpenGLContext)shareContext));
}
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
if (shareContext != null && !(shareContext is GLXOpenGLContext))
{
throw new ContextException($"shared context must be of type {typeof(GLXOpenGLContext).Name}.");
}
return(new WGLOpenGLContext(framebufferFormat, major, minor, flags, directRendering, (WGLOpenGLContext)shareContext));
}
throw new NotImplementedException();
}
public WGLOpenGLContext(FramebufferFormat framebufferFormat, int major, int minor, OpenGLContextFlags flags = OpenGLContextFlags.Default, bool directRendering = true, WGLOpenGLContext shareContext = null) : base(framebufferFormat, major, minor, flags, directRendering, shareContext)
{
_deviceContext = IntPtr.Zero;
_window = null;
}
public static IntPtr CreateContext(ref IntPtr windowHandle, FramebufferFormat framebufferFormat, int major, int minor, OpenGLContextFlags flags, bool directRendering, IntPtr shareContext)
{
EnsureInit();
bool hasTempWindow = windowHandle == IntPtr.Zero;
if (hasTempWindow)
{
windowHandle = Win32Helper.CreateNativeWindow(WindowStylesEx.WS_EX_OVERLAPPEDWINDOW,
WindowStyles.WS_CLIPSIBLINGS | WindowStyles.WS_CLIPCHILDREN,
"SPB intermediary context",
0, 0, 1, 1);
}
IntPtr dcHandle = GetDC(windowHandle);
int pixelFormat = FindClosestFormat(dcHandle, framebufferFormat);
if (pixelFormat == -1)
{
throw new PlatformException("Cannot find a valid pixel format");
}
PixelFormatDescriptor pfd = PixelFormatDescriptor.Create();
int res = DescribePixelFormat(dcHandle, pixelFormat, Marshal.SizeOf <PixelFormatDescriptor>(), ref pfd);
if (res == 0)
{
throw new PlatformException($"DescribePixelFormat failed: {Marshal.GetLastWin32Error()}");
}
res = SetPixelFormat(dcHandle, pixelFormat, ref pfd);
if (res == 0)
{
throw new PlatformException($"DescribePixelFormat failed: {Marshal.GetLastWin32Error()}");
}
List <int> contextAttributes = GetContextCreationARBAttribute(major, minor, flags);
IntPtr context = CreateContextAttribsArb(dcHandle, shareContext, contextAttributes.ToArray());
if (hasTempWindow)
{
DestroyWindow(windowHandle);
}
return(context);
}
private static List <int> GetContextCreationARBAttribute(int major, int minor, OpenGLContextFlags flags)
{
List <int> result = new List <int>();
result.Add((int)WGL.ARB.CreateContext.MAJOR_VERSION);
result.Add(major);
result.Add((int)WGL.ARB.CreateContext.MINOR_VERSION);
result.Add(minor);
if (flags != 0)
{
if (flags.HasFlag(OpenGLContextFlags.Debug))
{
result.Add((int)WGL.ARB.CreateContext.FLAGS);
result.Add((int)WGL.ARB.ContextFlags.DEBUG_BIT);
}
result.Add((int)WGL.ARB.CreateContext.PROFILE_MASK);
if (flags.HasFlag(OpenGLContextFlags.Compat))
{
result.Add((int)WGL.ARB.ContextProfileFlags.COMPATIBILITY_PROFILE);
}
else
{
result.Add((int)WGL.ARB.ContextProfileFlags.CORE_PROFILE);
}
}
// NOTE: Format is key: value, nothing in the spec specify if the end marker follow or not this format.
// BODY: As such, we add an extra 0 just to be sure we don't break anything.
result.Add(0);
result.Add(0);
return(result);
}
