It's analogous, but vertex shaders are just triangles, and in 2D graphics you have a lot of other stuff going on. The actual process of fine rasterization happ

It's analogous, but vertex shaders are just triangles, and in 2D graphics you have a lot of other stuff going on. The actual process of fine rasterization happens in quads, so there's a simple vertex shader that runs on GPU, sampling from the geometry buffers that are produced on CPU and uploaded.