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framebuffer compression.\nImplementations manage this transparently to applications, which is possible since the output is bit-exact.\n(The use of image compression (or not) can result in performance differences that are visible in profiling tools etc.)",{"type":2205,"tag":2206,"props":2224,"children":2225},{},[2226],{"type":2210,"value":2227},"Fixed-rate compression formats have so far not been supported.\nAs the term implies, these compression techniques are done at defined bitrates, and may therefore lose information compared to an uncompressed result.\nSince results are generally not bit-exact when compared to an uncompressed result, we do not want implementations to enable these algorithms without application opt-ins.",{"type":2205,"tag":2206,"props":2229,"children":2230},{},[2231],{"type":2210,"value":2232},"The fixed-rate compression algorithms are implementation-specific and not standardized.\nWe want to expose an API mechanism that abstracts the implementation-specific details.",{"type":2205,"tag":2206,"props":2234,"children":2235},{},[2236],{"type":2210,"value":2237},"Further, implementation may not support all possible compression rates and may not be able to use the requested compression rates in all cases (e.g. depending on image usage flags).\nWe want to expose a query to let applications understand what compression rates are available and what rates are applied to any given image.",{"type":2205,"tag":2212,"props":2239,"children":2241},{"id":2240},"_solution_space",[2242],{"type":2210,"value":2243},"Solution Space",{"type":2205,"tag":2206,"props":2245,"children":2246},{},[2247],{"type":2210,"value":2248},"To enable fixed-rate compression, two options were considered:",{"type":2205,"tag":2250,"props":2251,"children":2252},"ol",{},[2253,2259],{"type":2205,"tag":2254,"props":2255,"children":2256},"li",{},[2257],{"type":2210,"value":2258},"Add the option to enable compression on existing 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Options that were considered:",{"type":2205,"tag":2250,"props":2280,"children":2281},{},[2282,2287,2292,2297,2302],{"type":2205,"tag":2254,"props":2283,"children":2284},{},[2285],{"type":2210,"value":2286},"Describe them as bytes per 'block' of compressed data. We would likely need to describe the dimensions of each block as well as the size.",{"type":2205,"tag":2254,"props":2288,"children":2289},{},[2290],{"type":2210,"value":2291},"Describe them as percentages of the uncompressed size. The percentages would not always be integer sizes and hard to express as enumerants.",{"type":2205,"tag":2254,"props":2293,"children":2294},{},[2295],{"type":2210,"value":2296},"Describe them informally as low, medium, high. This would not be very informative.",{"type":2205,"tag":2254,"props":2298,"children":2299},{},[2300],{"type":2210,"value":2301},"Describe them as bits per pixel. This has the issue that the meaning of N bits per pixel is very different between a 1-component and a 4-component format.",{"type":2205,"tag":2254,"props":2303,"children":2304},{},[2305],{"type":2210,"value":2306},"Describe them as bits per component. This is new terminology.",{"type":2205,"tag":2206,"props":2308,"children":2309},{},[2310,2312,2319,2321,2327,2329,2335,2337,2343],{"type":2210,"value":2311},"In the end, the \"bits per component\" terminology was chosen so that the same compression rate describes the same degree of compression applied to formats that differ only in the number of channels.\nFor example, ",{"type":2205,"tag":2313,"props":2314,"children":2316},"code",{"className":2315},[],[2317],{"type":2210,"value":2318},"VK_FORMAT_R8G8_UNORM",{"type":2210,"value":2320}," compressed to half its original size is a rate of 4 bits per channel, 8 bits per pixel.\n",{"type":2205,"tag":2313,"props":2322,"children":2324},{"className":2323},[],[2325],{"type":2210,"value":2326},"VK_FORMAT_R8G8B8A8_UNORM",{"type":2210,"value":2328}," compressed to half ",{"type":2205,"tag":2330,"props":2331,"children":2332},"em",{},[2333],{"type":2210,"value":2334},"its",{"type":2210,"value":2336}," original size is 4 bits per channel, 16 bits per pixel.\nBoth of these cases could be requested with ",{"type":2205,"tag":2313,"props":2338,"children":2340},{"className":2339},[],[2341],{"type":2210,"value":2342},"VK_IMAGE_COMPRESSION_FIXED_RATE_4BPC_BIT_EXT",{"type":2210,"value":2344},".",{"type":2205,"tag":2212,"props":2346,"children":2348},{"id":2347},"_proposal",[2349],{"type":2210,"value":2350},"Proposal",{"type":2205,"tag":2352,"props":2353,"children":2355},"h3",{"id":2354},"_api_features",[2356],{"type":2210,"value":2357},"API Features",{"type":2205,"tag":2206,"props":2359,"children":2360},{},[2361],{"type":2210,"value":2362},"Implementations may support fixed-rate compression for any image, including swapchain images.\nTo allow  the implementation of the WSI to be independent from the ICD, the feature is split in two extensions: . 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