/// <summary>
/// Creates a context.
/// </summary>
/// <param name="sharedContext">
/// A <see cref="IntPtr"/> that specify a context that will share objects with the returned one. If
/// it is IntPtr.Zero, no sharing is performed.
/// </param>
/// <returns>
/// A <see cref="IntPtr"/> that represents the handle of the created context. If the context cannot be
/// created, it returns IntPtr.Zero.
/// </returns>
/// <exception cref="InvalidOperationException">
/// Exception thrown in the case <paramref name="sharedContext"/> is different from IntPtr.Zero, and the objects
/// cannot be shared with it.
/// </exception>
public override IntPtr CreateContext(IntPtr sharedContext)
{
if (XVisualInfo == null)
{
throw new InvalidOperationException("no visual information");
}
using (Glx.XLock displayLock = new Glx.XLock(Display)) {
return(Glx.CreateContext(Display, XVisualInfo, sharedContext, true));
}
}
/// <summary>
/// Creates a context.
/// </summary>
/// <param name="sharedContext">
/// A <see cref="IntPtr"/> that specify a context that will share objects with the returned one. If
/// it is IntPtr.Zero, no sharing is performed.
/// </param>
/// <returns>
/// A <see cref="IntPtr"/> that represents the handle of the created context. If the context cannot be
/// created, it returns IntPtr.Zero.
/// </returns>
/// <exception cref="InvalidOperationException">
/// Exception thrown in the case <paramref name="sharedContext"/> is different from IntPtr.Zero, and the objects
/// cannot be shared with it.
/// </exception>
public override IntPtr CreateContext(IntPtr sharedContext)
{
if (Glx.CurrentExtensions == null || Glx.CurrentExtensions.CreateContext_ARB == false)
{
using (Glx.XLock displayLock = new Glx.XLock(Display)) {
// Get the corresponding X visual info
Glx.XVisualInfo xVisualInfo = _XVisualInfo != null ? _XVisualInfo : GetVisualInfoFromXWindow(_WindowHandle);
Debug.Assert(xVisualInfo != null, "SetPixelFormat not executed or undetected XVisualInfo");
return(Glx.CreateContext(Display, xVisualInfo, sharedContext, true));
}
}
else
{
return(CreateContextAttrib(sharedContext, new int[] { Gl.NONE }));
}
}
/// <summary>
/// Creates an OpenGL context from a Unix/Linux platform.
/// </summary>
/// <returns>
/// A <see cref="IDeviceContext"/> that specify the device context.
/// </returns>
private static IntPtr CreateX11SimpleContext(IDeviceContext rDevice)
{
XServerDeviceContext x11DeviceCtx = (XServerDeviceContext)rDevice;
IntPtr rContext;
using (Glx.XLock xLock = new Glx.XLock(x11DeviceCtx.Display)) {
int[] attributes = new int[] {
Glx.RENDER_TYPE, (int)Glx.RGBA_BIT,
0
};
// Get basic visual
unsafe {
int[] choosenConfigCount = new int[1];
IntPtr *choosenConfigs = Glx.ChooseFBConfig(x11DeviceCtx.Display, x11DeviceCtx.Screen, attributes, choosenConfigCount);
if (choosenConfigCount[0] == 0)
{
throw new InvalidOperationException("unable to find basic visual");
}
IntPtr choosenConfig = *choosenConfigs;
x11DeviceCtx.XVisualInfo = Glx.GetVisualFromFBConfig(x11DeviceCtx.Display, choosenConfig);
x11DeviceCtx.FBConfig = choosenConfig;
Glx.UnsafeNativeMethods.XFree((IntPtr)choosenConfigs);
}
// Create direct context
rContext = x11DeviceCtx.CreateContext(IntPtr.Zero);
if (rContext == IntPtr.Zero)
{
// Fallback to not direct context
rContext = Glx.CreateContext(x11DeviceCtx.Display, x11DeviceCtx.XVisualInfo, IntPtr.Zero, false);
}
if (rContext == IntPtr.Zero)
{
throw new InvalidOperationException("unable to create context");
}
return(rContext);
}
}
