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Otherwise, if it is interpreted as a relative time, it specifies the minimum duration in nanoseconds the previously presented image should be visible.",{"type":1873,"tag":1874,"props":5094,"children":5095},{},[5096,5097,5103,5105,5110],{"type":1878,"value":2102},{"type":1873,"tag":1931,"props":5098,"children":5100},{"className":5099},[],[5101],{"type":1878,"value":5102},"VK_PRESENT_TIMING_INFO_PRESENT_AT_NEAREST_REFRESH_CYCLE_BIT_EXT",{"type":1878,"value":5104}," is set, it indicates that the application would prefer the image to be made visible during the refresh cycle that is closest to the target present time, even if that refresh cycle starts earlier than the specified ",{"type":1873,"tag":1931,"props":5106,"children":5108},{"className":5107},[],[5109],{"type":1878,"value":4892},{"type":1878,"value":2155},{"type":1873,"tag":4621,"props":5112,"children":5113},{},[5114],{"type":1873,"tag":1874,"props":5115,"children":5116},{},[5117,5119,5124],{"type":1878,"value":5118},"More specifically, the implementation attempts to align the ",{"type":1873,"tag":1931,"props":5120,"children":5122},{"className":5121},[],[5123],{"type":1878,"value":2482},{"type":1878,"value":5125}," present stage with the requested target present time.",{"type":1873,"tag":4621,"props":5127,"children":5128},{},[5129],{"type":1873,"tag":1874,"props":5130,"children":5131},{},[5132,5134,5139,5141,5147,5149,5154,5156,5161],{"type":1878,"value":5133},"To maintain a constant image present duration (IPD), applications should use timing information collected via ",{"type":1873,"tag":1931,"props":5135,"children":5137},{"className":5136},[],[5138],{"type":1878,"value":2660},{"type":1878,"value":5140}," to determine the target time of each present. If the presentation engine is operating with a fixed refresh rate, the application’s IPD should be a multiple of ",{"type":1873,"tag":1931,"props":5142,"children":5144},{"className":5143},[],[5145],{"type":1878,"value":5146},"VkSwapchainTimingPropertiesEXT::refreshInterval",{"type":1878,"value":5148},". That is, the quanta for changing the IPD is ",{"type":1873,"tag":1931,"props":5150,"children":5152},{"className":5151},[],[5153],{"type":1878,"value":2940},{"type":1878,"value":5155},". For example, if ",{"type":1873,"tag":1931,"props":5157,"children":5159},{"className":5158},[],[5160],{"type":1878,"value":2929},{"type":1878,"value":5162}," is 16.67ms, the IPD can be 16.67ms, 33.33ms, 50.0ms, etc.",{"type":1873,"tag":1880,"props":5164,"children":5166},{"id":5165},"_examples",[5167],{"type":1878,"value":5168},"Examples",{"type":1873,"tag":1997,"props":5170,"children":5172},{"id":5171},"_enabling_present_timing_for_a_swapchain_2",[5173],{"type":1878,"value":2526},{"type":1873,"tag":2013,"props":5175,"children":5177},{"className":2015,"code":5176,"language":2017,"meta":2018,"style":2018},"    // Query device features\n    VkPhysicalDevicePresentTimingFeaturesEXT deviceFeaturesPresentTiming = {\n        .sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_PRESENT_TIMING_FEATURES_EXT\n    };\n\n    VkPhysicalDeviceFeatures2 features2 = {\n        .sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_FEATURES_2,\n        .pNext = &deviceFeaturesPresentTiming\n    };\n\n    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0;\n    VkSwapchainTimeDomainPropertiesEXT timeDomains = {\n        .sType = VK_STRUCTURE_TYPE_SWAPCHAIN_TIME_DOMAIN_PROPERTIES_EXT,\n        .pNext = NULL,\n        .timeDomainCount = 0,\n        .pTimeDomains = NULL,\n        .pTimeDomainIds = NULL\n    };\n\n    result = vkGetSwapchainTimeDomainPropertiesEXT(device, swapchain, &timeDomains, NULL);\n    timeDomains.pTimeDomains = (VkTimeDomainKHR *) malloc(timeDomains.timeDomainCount * sizeof(VkTimeDomainKHR));\n    timeDomains.pTimeDomainIds = (uint64_t *) malloc(timeDomains.timeDomainCount * sizeof(uint64_t));\n    result = vkGetSwapchainTimeDomainPropertiesEXT(device, swapchain, &timeDomains, &currentTimeDomainsCounter);\n\n    // Find the ID of the current VK_TIME_DOMAIN_SWAPCHAIN_LOCAL_EXT time domain\n    uint64_t swapchainLocalTimeDomainId = FindTimeDomain(&timeDomains, VK_TIME_DOMAIN_SWAPCHAIN_LOCAL_EXT);\n\n    // Allocate internal queue to collect present timing results\n    const uint32_t maxTimingCount = 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implementors.",{"type":1873,"tag":1997,"props":9432,"children":9434},{"id":9433},"_how_does_the_application_choose_the_internal_queue_size_to_pass_in_vksetswapchainpresenttimingqueuesize",[9435,9437,9443],{"type":1878,"value":9436},"How does the application choose the internal queue size to pass in ",{"type":1873,"tag":1931,"props":9438,"children":9440},{"className":9439},[],[9441],{"type":1878,"value":9442},"vkSetSwapchainPresentTimingQueueSize",{"type":1878,"value":9356},{"type":1873,"tag":1874,"props":9445,"children":9446},{},[9447],{"type":1878,"value":9448},"Use reasonable default values, such as a multiple of the swapchain image count.",{"type":1873,"tag":1874,"props":9450,"children":9451},{},[9452],{"type":1878,"value":9453},"Because presenting when the swapchain’s internal timing queue is full is considered an error, the latency of the timing results effectively can end up throttling the present rate if the internal queue is small enough. The topology of the presentation engine being generally opaque to applications, there is no indication of the feedback latency before the application starts presenting.",{"type":1873,"tag":1874,"props":9455,"children":9456},{},[9457],{"type":1878,"value":9458},"Applications which run into feedback latency issues can resize the internal timing queue.",{"type":1873,"tag":1997,"props":9460,"children":9462},{"id":9461},"_do_we_need_an_api_to_synchronously_wait_for_present_timing_feedback",[9463],{"type":1878,"value":9464},"Do we need an API to synchronously wait for present timing feedback?",{"type":1873,"tag":1874,"props":9466,"children":9467},{},[9468],{"type":1878,"value":9469},"No, because some implementations cannot provide a synchronous wait on those results. However, allow applications to call vkGetPastPresentationTimingEXT without external synchronization.",{"type":1873,"tag":1997,"props":9471,"children":9473},{"id":9472},"_proposed_how_do_we_handle_dynamic_surface_properties_updates",[9474],{"type":1878,"value":9475},"PROPOSED: How do we handle dynamic surface properties updates?",{"type":1873,"tag":1874,"props":9477,"children":9478},{},[9479,9484,9486,9491,9493,9498],{"type":1873,"tag":1931,"props":9480,"children":9482},{"className":9481},[],[9483],{"type":1878,"value":2166},{"type":1878,"value":9485}," objects capabilities are dynamic and can respond to a lot of different events. For example, when an application user moves a window to another monitor, it is possible for the underlying surface’s capabilities to change. In the context of this extension, this means that some of the parameters set in a ",{"type":1873,"tag":1931,"props":9487,"children":9489},{"className":9488},[],[9490],{"type":1878,"value":4494},{"type":1878,"value":9492}," struct and passed to ",{"type":1873,"tag":1931,"props":9494,"children":9496},{"className":9495},[],[9497],{"type":1878,"value":2136},{"type":1878,"value":9499},", for example, may not be valid by the time the presentation engine processes the presentation request.\nThe implementation must thus be able to handle parameters that have become invalid without the application’s knowledge. In those cases, the specification provides sane \"fallback\" behaviors, e.g. reporting timestamps in a different time domain, reporting 0 values when unavailable, etc.",{"type":1873,"tag":1997,"props":9501,"children":9503},{"id":9502},"_proposed_how_are_dropped_presentation_requests_handled",[9504],{"type":1878,"value":9505},"PROPOSED: How are dropped presentation requests handled?",{"type":1873,"tag":1874,"props":9507,"children":9508},{},[9509,9511,9516],{"type":1878,"value":9510},"Implementations will return a time of 0 for all present stages that occur after the request is dropped. In the future, ",{"type":1873,"tag":1931,"props":9512,"children":9514},{"className":9513},[],[9515],{"type":1878,"value":4226},{"type":1878,"value":9517}," could be extended to include a flag or status bitfield to indicate the reason the request was dropped.",{"type":1873,"tag":1997,"props":9519,"children":9521},{"id":9520},"_proposed_how_do_different_variable_refresh_rate_technologies_interact_with_this_extension",[9522],{"type":1878,"value":9523},"PROPOSED: How do different variable refresh rate technologies interact with this extension?",{"type":1873,"tag":1874,"props":9525,"children":9526},{},[9527,9529,9534],{"type":1878,"value":9528},"Expose multiple durations in ",{"type":1873,"tag":1931,"props":9530,"children":9532},{"className":9531},[],[9533],{"type":1878,"value":2686},{"type":1878,"value":9535}," to describe the variable refresh rate properties of the swapchain. One value is the minimum refresh cycle duration, while the other is the granularity at which the refresh cycle duration can be adjusted when presenting. This allows to support FRR, VRR, and, at least partially, Adaptive Refresh Rate (ARR) technologies. Note these values only reflect the current swapchain’s behavior, and may be different from the actual display hardware capabilities, which need to be queried separately.",{"type":1873,"tag":1997,"props":9537,"children":9539},{"id":9538},"_proposed_how_does_an_application_adjust_its_ipd_to_match_the_swapchains_refresh_rate",[9540],{"type":1878,"value":9541},"PROPOSED: How does an application adjust its IPD to match the swapchain’s refresh rate?",{"type":1873,"tag":1874,"props":9543,"children":9544},{},[9545],{"type":1878,"value":9546},"Applications can know if they are presenting late by comparing a presentation request’s timing results against their corresponding target present time.",{"type":1873,"tag":1874,"props":9548,"children":9549},{},[9550,9552,9557,9558,9563],{"type":1878,"value":9551},"If images are consistently presented at their desired present time, applications can query results for the  ",{"type":1873,"tag":1931,"props":9553,"children":9555},{"className":9554},[],[9556],{"type":1878,"value":2434},{"type":1878,"value":1937},{"type":1873,"tag":1931,"props":9559,"children":9561},{"className":9560},[],[9562],{"type":1878,"value":2460},{"type":1878,"value":9564}," stages, and subtract those values to get an estimate of how early presentation requests are. 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