I thinking about rendering into single pixel (1x1) framebuffer. For example we have two triangles which covers whole NDC area, one is green second red.
What color will be written to 1x1 framebuffer? As far as I understend graphic API (no matter which) tries to put whole scene in to given framebuffer, in our example, into single pixel. But I can't figure how GPU will choose what should be written into that pixel.