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is a process used by GPU to convert your line or triangle call into multitude of pixels on user screen.
When you issue a call to draw a triangle, you supply 3 vertices, which are converted to 3 pixels on user screen and then pixel-by-pixel, line-by-line - the triangle is drawn, using pixels on users screen.
Actually, it's done in parallel using many processing units available on GPU
, so all (or most) of these points are drawn at the same time by up to 17000 "processors". They are going through many stages, like stencil testing
, depth testing
, alpha testing
and alpha blending
Each of those pixels also have z coordinate value, which doesn't appear directly on screen, but is used for depth testing.