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vtkext/private/module/CMakeLists.txt

@@ -66,6 +66,12 @@ if(WIN32)
   list(APPEND classes vtkF3DWin32OutputWindow vtkF3DWGLRenderWindow)
 endif()
 
+# In theory the test should be `if (VTK_USE_X)` but this variable is
+# only exported starting from VTK 9.4
+if(UNIX AND NOT APPLE AND NOT EMSCRIPTEN AND NOT ANDROID)
+  list(APPEND classes vtkF3DGLXRenderWindow)
+endif()
+
 if(ANDROID)
   list(APPEND classes vtkF3DAndroidLogOutputWindow)
 endif()

vtkext/private/module/vtkF3DGLXRenderWindow.cxx

@@ -0,0 +1,38 @@
+#include <vtkObjectFactory.h>
+#include <vtkVersion.h>
+
+#if VTK_VERSION_NUMBER >= VTK_VERSION_CHECK(9, 3, 20240914)
+#include <vtk_glad.h>
+#include <vtkglad/include/glad/glx.h>
+#else
+#include <vtk_glew.h>
+#endif
+
+#include "vtkF3DGLXRenderWindow.h"
+
+#include <X11/Xlib.h>
+
+//------------------------------------------------------------------------------
+vtkF3DGLXRenderWindow::vtkF3DGLXRenderWindow() = default;
+
+//------------------------------------------------------------------------------
+vtkF3DGLXRenderWindow::~vtkF3DGLXRenderWindow() = default;
+
+//------------------------------------------------------------------------------
+vtkF3DGLXRenderWindow* vtkF3DGLXRenderWindow::New()
+{
+  // Check if the X display is available
+  Display* dpy = XOpenDisplay(nullptr);
+  if (dpy == nullptr)
+  {
+    return nullptr;
+  }
+  XCloseDisplay(dpy);
+
+#if VTK_VERSION_NUMBER >= VTK_VERSION_CHECK(9, 3, 20240914)
+  // Load core glx functions
+  gladLoaderLoadGLX(nullptr, 0);
+#endif
+
+  VTK_STANDARD_NEW_BODY(vtkF3DGLXRenderWindow);
+}

vtkext/private/module/vtkF3DGLXRenderWindow.h

@@ -0,0 +1,25 @@
+/**
+ * @class   vtkF3DGLXRenderWindow
+ * @brief   GLX context render window
+ */
+
+#ifndef vtkF3DGLXRenderWindow_h
+#define vtkF3DGLXRenderWindow_h
+
+#include "vtkXOpenGLRenderWindow.h"
+
+class vtkF3DGLXRenderWindow : public vtkXOpenGLRenderWindow
+{
+public:
+  static vtkF3DGLXRenderWindow* New();
+  vtkTypeMacro(vtkF3DGLXRenderWindow, vtkXOpenGLRenderWindow);
+
+protected:
+  vtkF3DGLXRenderWindow();
+  ~vtkF3DGLXRenderWindow() override;
+
+private:
+  vtkF3DGLXRenderWindow(const vtkF3DGLXRenderWindow&) = delete;
+  void operator=(const vtkF3DGLXRenderWindow&) = delete;
+};
+#endif // vtkF3DGLXRenderWindow_h