| 摘要 |
Tile based rendering systems operate with predicated geometry whilst only making a single rasterisation pass. To do this, geometry to be predicated is substituted in image data with visibility test objects and associated conditional break points. In rasterisation, when a visibility test object is encountered, a visible pixel count register (<B>405</B>) is updated. On completion of rasterisation of a tile, the associated conditional break points are used to test (<B>415</B>) the visible pixel count register to determine if the predicated geometry should be processed and inserted into tile object lists. If it is, then a tile object list corresponding to the predicated geometry is inserted into the tile object list for the current tile and is rasterised before moving onto the next tile. |
