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Many implementations may prefer non-coherent access with explicit synchronization from applications.",{"type":10,"tag":54,"props":208,"children":209},{},[210],{"type":20,"value":211},"Descriptors need to be bound for render target access (at least for some implementations).",{"type":10,"tag":11,"props":213,"children":214},{},[215],{"type":20,"value":216},"This proposal targets the first choice.",{"type":10,"tag":11,"props":218,"children":219},{},[220],{"type":20,"value":221},"The options for scope include:",{"type":10,"tag":50,"props":223,"children":224},{},[225,230,235],{"type":10,"tag":54,"props":226,"children":227},{},[228],{"type":20,"value":229},"\"Framebuffer fetch\" equivalent, i.e. enable access to the previously written pixel in the local framebuffer region",{"type":10,"tag":54,"props":231,"children":232},{},[233],{"type":20,"value":234},"\"Pixel local storage\" equivalent, i.e. as above with the addition of pixel format reinterpretation",{"type":10,"tag":54,"props":236,"children":237},{},[238],{"type":20,"value":239},"\"Tile shader\" equivalent, i.e. enable access to a region larger than 1x1 pixels",{"type":10,"tag":11,"props":241,"children":242},{},[243],{"type":20,"value":244},"This proposal targets the first option, but adds building blocks to enable future enhancements.\nThe reasoning behind this choice is that:",{"type":10,"tag":50,"props":246,"children":247},{},[248,253,258,263],{"type":10,"tag":54,"props":249,"children":250},{},[251],{"type":20,"value":252},"It should be possible to support this extension on existing GPUs",{"type":10,"tag":54,"props":254,"children":255},{},[256],{"type":20,"value":257},"Many use-cases that benefit from subpasses could be implemented with this functionality",{"type":10,"tag":54,"props":259,"children":260},{},[261],{"type":20,"value":262},"Ease of integration; this option requires the least amount of changes to rendering engines",{"type":10,"tag":54,"props":264,"children":265},{},[266,268],{"type":20,"value":267},"Time to market; several IHVs would like at least the subpass equivalent functionality to be implemented alongside ",{"type":10,"tag":15,"props":269,"children":271},{"className":270},[],[272],{"type":20,"value":29},{"type":10,"tag":93,"props":274,"children":276},{"id":275},"_implementation_choices",[277],{"type":20,"value":278},"Implementation choices",{"type":10,"tag":11,"props":280,"children":281},{},[282],{"type":20,"value":283},"It is useful to provide tile image access for all attachment types.\nBut implementations may manage depth/stencil differently than color, which could add constraints.\nWe will therefore expose separate feature bits for color, depth, and stencil access.",{"type":10,"tag":11,"props":285,"children":286},{},[287],{"type":20,"value":288},"Tile image variables currently have to 'alias' a color attachment location, and their format is implicitly specified to match the color attachment format.",{"type":10,"tag":33,"props":290,"children":292},{"id":291},"_proposal",[293],{"type":20,"value":294},"Proposal",{"type":10,"tag":93,"props":296,"children":298},{"id":297},"_concept",[299],{"type":20,"value":300},"Concept",{"type":10,"tag":11,"props":302,"children":303},{},[304],{"type":10,"tag":305,"props":306,"children":310},"img",{"alt":307,"src":308,"title":309},"tile image","https://data.vkdoc.net/images/tile_image.svg","Tile Image",[],{"type":10,"tag":11,"props":312,"children":313},{},[314],{"type":20,"value":315},"Introduce the concept of a 'tile image'. 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