The samples in this repository demonstrate Open CASCADE Technology (OCCT) 3D Viewer setup within GTK+ (gtkmm) GUI framework on Linux and Windows platforms.
Use CMake for building the project.
See CMakeLists.txt in the folder defining building rules.
Use cmake-gui or command-line interface for configuring project dependencies GTK+ (gtkmm-3.0/gtkmm-4.0), OpenGL and Open CASCADE Technology (OCCT) libraries.
Building has been checked within development snapshot of OCCT 7.6.0 on Xubuntu 21.04.
On Windows platform, building has been checked with MinGW builds of GTK (from MSYS2 packages).
The CMake option USE_GLES2 could be used to switch from OpenGL desktop (TKOpenGl)
to OpenGL ES (TKOpenGles) implementation, which would require OCCT built with appropriate modules enabled.
Projects within occt-gtk3-glarea (GTK3) and occt-gtk4-glarea (GTK4) subfolders
shows OCCT 3D viewer setup from OpenGL context created by Gtk::GLArea within GTK application.
The samples relies on X11 backend (GDK_BACKEND=x11) with GLX (GDK_DISABLE=egl),
so that on Wayland session it will be running through Xwayland (which is expected to be done automatically).
Sample defines these environment variables within OcctGtkTools::gtkGlPlatformSetup()
method called from main() before GTK application initialization,
as GTK provides no public API for managing this
(these GTK variables are provided 'for debugging purposes' and their behavior can be changed in future).
Some bugs related to Gtk::GLArea have been observed with older GTK+ versions (Xubuntu 18.04).