I had this one in mind: https://www.khronos.org/registry/EGL/extensions/EXT/EGL_EXT_buffer_age.txt https://www.khronos.org/registry/EGL/extensions/EXT/EGL_EXT_.

I had this one in mind: https://www.khronos.org/registry/EGL/extensions/EXT/EGL_EXT_buffer_age.txt https://www.khronos.org/registry/EGL/extensions/EXT/EGL_EXT_... Note that Kristian Høgsberg, for years the main developer of Wayland, is among the authors. So I guess it is actually not so obscure in the Wayland context. It tells you how many frames old the current back buffer is, so you can repaint as necessary to take it from the state n frames ago to the state now.