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This is typically done using additional render pass instances or\ncompute passes on the same graphics and compute queue - and on the same\nphysical device.",{"type":2173,"tag":2174,"props":2192,"children":2193},{},[2194],{"type":2178,"value":2195},"In some cases, however, the post-processing can be more efficiently done\non specialized hardware - that is not Vulkan-capable. The various memory\nimport and export extensions can support this use case. But existing\nsynchronization requires that the Vulkan device has rendered the complete\noutput image before the external device can access it. In many cases, the\nlatency would be reduced if the post-processing could start before the\ncomplete image is rendered.",{"type":2173,"tag":2174,"props":2197,"children":2198},{},[2199],{"type":2178,"value":2200},"This proposal aims to support this latency reduction by splitting the\nprocessing of a render pass instance into a set of stripes that can be\nindividually synchronized with an external device.",{"type":2173,"tag":2180,"props":2202,"children":2204},{"id":2203},"_solution_space",[2205],{"type":2178,"value":2206},"Solution Space",{"type":2173,"tag":2174,"props":2208,"children":2209},{},[2210],{"type":2178,"value":2211},"The first option to consider is to just use the render area (in\nVkRenderingInfo or VkRenderPassBeginInfo) to render each stripe\nseparately. 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stripeSemaphoreInfoCount;\n",{"type":2173,"tag":2310,"props":2857,"children":2858},{"class":2312,"line":30},[2859,2863,2868,2872],{"type":2173,"tag":2310,"props":2860,"children":2861},{"style":2316},[2862],{"type":2178,"value":2549},{"type":2173,"tag":2310,"props":2864,"children":2865},{"style":2327},[2866],{"type":2178,"value":2867}," VkSemaphoreSubmitInfo",{"type":2173,"tag":2310,"props":2869,"children":2870},{"style":2316},[2871],{"type":2178,"value":2587},{"type":2173,"tag":2310,"props":2873,"children":2874},{"style":2327},[2875],{"type":2178,"value":2876}," pStripeSemaphoreInfos;\n",{"type":2173,"tag":2310,"props":2878,"children":2879},{"class":2312,"line":34},[2880],{"type":2173,"tag":2310,"props":2881,"children":2882},{"style":2327},[2883],{"type":2178,"value":2884},"} VkRenderPassStripeSubmitInfoARM;\n",{"type":2173,"tag":2174,"props":2886,"children":2887},{},[2888,2894,2896,2902,2904,2909,2911,2917,2919,2925],{"type":2173,"tag":2306,"props":2889,"children":2891},{"className":2890},[],[2892],{"type":2178,"value":2893},"stripeSemaphoreInfoCount",{"type":2178,"value":2895}," is the number of elements in ",{"type":2173,"tag":2306,"props":2897,"children":2899},{"className":2898},[],[2900],{"type":2178,"value":2901},"pStripeSemaphoreInfos",{"type":2178,"value":2903},".\nThe value of ",{"type":2173,"tag":2306,"props":2905,"children":2907},{"className":2906},[],[2908],{"type":2178,"value":2893},{"type":2178,"value":2910}," must be equal to the sum of the\n",{"type":2173,"tag":2306,"props":2912,"children":2914},{"className":2913},[],[2915],{"type":2178,"value":2916},"VkRenderPassStripeBeginInfoARM→stripeInfoCount",{"type":2178,"value":2918}," parameters that are recorded\nin the 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if ",{"type":2173,"tag":2306,"props":2950,"children":2952},{"className":2951},[],[2953],{"type":2178,"value":2924},{"type":2178,"value":2955}," contains three\nrender passes, where the first has two stripes, the second is not striped,\nand the third has three stripes, then ",{"type":2173,"tag":2306,"props":2957,"children":2959},{"className":2958},[],[2960],{"type":2178,"value":2893},{"type":2178,"value":2962}," must have\nthe value 5, the first two entries of ",{"type":2173,"tag":2306,"props":2964,"children":2966},{"className":2965},[],[2967],{"type":2178,"value":2901},{"type":2178,"value":2969}," are associated\nwith the first render pass and the last three entries are associated with\nthe third render pass. The semaphore in the first entry of\n",{"type":2173,"tag":2306,"props":2971,"children":2973},{"className":2972},[],[2974],{"type":2178,"value":2901},{"type":2178,"value":2976}," is signaled when the first stripe of the first\nrender pass is complete, etc.",{"type":2173,"tag":2180,"props":2978,"children":2980},{"id":2979},"_issues",[2981],{"type":2178,"value":2982},"Issues",{"type":2173,"tag":2292,"props":2984,"children":2986},{"id":2985},"_naming_do_we_use_stripe_or_slice",[2987],{"type":2178,"value":2988},"Naming. Do we use \"stripe\" or \"slice\"?",{"type":2173,"tag":2174,"props":2990,"children":2991},{},[2992],{"type":2178,"value":2993},"The specification uses \"slice\" to refer to slices of a 3D image.\nThis proposal wants to express partitions in 2D.\nThe video extensions, e.g., \"VK_EXT_video_decode_h264\" uses \"slice\" to mean\nsomething very similar to what this proposal is aiming to achieve.",{"type":2173,"tag":2174,"props":2995,"children":2996},{},[2997],{"type":2178,"value":2998},"We use \"stripe\" to disambiguate from the way slice is used to describe\npartitions in 3D.",{"type":2173,"tag":2292,"props":3000,"children":3002},{"id":3001},"_could_we_use_timeline_semaphores_for_this",[3003],{"type":2178,"value":3004},"Could we use timeline semaphores for this?",{"type":2173,"tag":2174,"props":3006,"children":3007},{},[3008],{"type":2178,"value":3009},"Probably, but timeline semaphores are not yet available on all platforms.",{"type":2173,"tag":2174,"props":3011,"children":3012},{},[3013],{"type":2178,"value":3014},"Regular timeline semaphores are not shareable to foreign queues so are\nnot a good fit for the target use cases.",{"type":2173,"tag":2174,"props":3016,"children":3017},{},[3018],{"type":2178,"value":3019},"External timeline semaphores require the native platform to support\nTIMELINE type native fence. There are two ways to export these:",{"type":2173,"tag":2238,"props":3021,"children":3022},{},[3023,3028],{"type":2173,"tag":2242,"props":3024,"children":3025},{},[3026],{"type":2178,"value":3027},"OPAQUE_FD: These are of limited use since they can only be shared by the same driver",{"type":2173,"tag":2242,"props":3029,"children":3030},{},[3031],{"type":2178,"value":3032},"Platform timeline fences: There is currently no way to export these from Vulkan",{"type":2173,"tag":2174,"props":3034,"children":3035},{},[3036],{"type":2178,"value":3037},"For now, we require binary semaphores.",{"type":2173,"tag":2292,"props":3039,"children":3041},{"id":3040},"_how_do_stripes_interact_with_multiview_or_layered_rendering",[3042],{"type":2178,"value":3043},"How do stripes interact with multiview or layered rendering?",{"type":2173,"tag":2174,"props":3045,"children":3046},{},[3047],{"type":2178,"value":3048},"The main question is whether a stripe covers individual views (or layers of\nthe framebuffer) or all of them.",{"type":2173,"tag":2174,"props":3050,"children":3051},{},[3052],{"type":2178,"value":3053},"Each view could be post-processed separately - and in that case, one may want\nto start the post-processing for a stripe of one view before the next view is\nprocessed. In that case, we would want one semaphore per view.",{"type":2173,"tag":2174,"props":3055,"children":3056},{},[3057],{"type":2178,"value":3058},"This extension is specified to complete a stripe for all views (or layers)\nbefore moving on to the next stripe. The main motivation for this choice is\nto reduce the number of synchronization operations required.",{"type":2173,"tag":2292,"props":3060,"children":3062},{"id":3061},"_is_striped_rendering_supported_for_all_renderable_formats",[3063],{"type":2178,"value":3064},"Is striped rendering supported for all renderable formats?",{"type":2173,"tag":2174,"props":3066,"children":3067},{},[3068],{"type":2178,"value":3069},"Yes.",{"type":2173,"tag":3071,"props":3072,"children":3073},"style",{},[3074],{"type":2178,"value":3075},"html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}",{"title":2303,"searchDepth":14,"depth":14,"links":3077},[3078,3079,3080,3085],{"id":2182,"depth":14,"text":2185},{"id":2203,"depth":14,"text":2206},{"id":2287,"depth":14,"text":2290,"children":3081},[3082,3083,3084],{"id":2294,"depth":18,"text":223},{"id":2388,"depth":18,"text":2391},{"id":2480,"depth":18,"text":2483},{"id":2979,"depth":14,"text":2982,"children":3086},[3087,3088,3089,3090],{"id":2985,"depth":18,"text":2988},{"id":3001,"depth":18,"text":3004},{"id":3040,"depth":18,"text":3043},{"id":3061,"depth":18,"text":3064},"markdown",1782472030926]