[flohofwoe]

It means that most of the rendering pipeline is working: getting data from the CPU- to the GPU-side, compiling, uploading and running shaders (big deal!), fixed-function render states / pipeline-state-objects, rasterization to the framebuffer and displaying the result. I'd wager that getting an untextured triangle on screen is probably 70% of the total work (I'm not a GPU driver coder though, but that number is about right for writing a "user mode" 3D API wrapper).

Also: this is on hardware without any public information available that has to be reverse engineered from scratch, this is the actually incredible part.