https://skia.googlesource.com/external/github.com/ocornut/imgui/+/bc1545ee82212d71ba9d0539eecf12724e8c770b/examples/example_glfw_opengl3/
examples/example_glfw_opengl3 - external/github.com/ocornut/imgui - Git at Google
https://www.oldunreal.com/phpBB3/viewtopic.php?p=1018
XOpenGL OpenGL3 / OpenGL4 renderer for UnrealTournament - Page 3 - OldUnreal (Engine)
rendereroldunrealengine