Graphics processing apparatus, methods and computer program products using minimum-depth occlusion culling and zig-zag traversal

A method of graphics processing comprising defining a plurality of rows of tiles (710) in a field of graphics display comprising a plurality of rows of pixels, including each grid pixels of at least two rows of pixels, and characterized by : placing flags occlusion (720) for the respective grids of a row of grids for graphics primitive element based on whether respective representative depth values ​​of the grid row grids meet a criterion occlusion; and processing pixels (730) in rows corresponding to the row of grids of graphics primitives form a row by row in response to the occlusion flags pixels.