[Feature Request] Offer a way to display triangles rendered per frame

Describe the request

This application should have an option to display the number of triangles rendered per frame.

Use case

My interest here is in measurements of the triangles per frame actually achieved by video games from before 2000, and existing measurements of triangles per frame of such video games are very hard to find.

Alternatives considered

In systems with Mesa (such as many Linux-based systems), a similar display for OpenGL applications can be enabled through the environment variables GALLIUM_HUD=primitives-generated,fps GALLIUM_HUD_PERIOD=1. Here, primitives-generated carries the statistic of interest in this issue.

However, Windows is not likely to carry Mesa.

Additional context

No response