March 3, 2019 
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March 3, 2019 [01:23:59] <Ralith> does a descriptor array consume a single descriptor set binding?[01:24:38] <Ralith> looks like yes[01:26:47] *** glYoda <glYoda!~MTLYoda@c-73-25-27-206.hsd1.or.comcast.net> has quit IRC (Ping timeout: 240 seconds)[01:31:13] *** Stenzek <Stenzek!~stenzek@2001:19f0:5801:3fe:5400:ff:fe5d:7bf6> has joined ##vulkan[03:31:39] *** ratchetfreak <ratchetfreak!~ratchetfr@ptr-82s3g7mshmuppe4qf4b.18120a2.ip6.access.telenet.be> has quit IRC (Ping timeout: 258 seconds)[03:53:28] *** d3x0r <d3x0r!~d3x0r@ip174-72-226-164.lv.lv.cox.net> has joined ##vulkan[03:57:35] *** marijnfs <marijnfs!~marijnfs@193.180.164.37> has joined ##vulkan[04:38:17] *** penguin42 <penguin42!~dg@cpc109017-salf6-2-0-cust428.10-2.cable.virginm.net> has quit IRC (Remote host closed the connection)[04:54:34] *** HZun <HZun!~HZun@0x3ec721e2.osd.customer.dk.telia.net> has joined ##vulkan[04:55:28] *** marijnfs <marijnfs!~marijnfs@193.180.164.37> has quit IRC (Ping timeout: 245 seconds)[05:06:19] *** Lucretia <Lucretia!~Luke@pdpc/supporter/active/lucretia> has quit IRC (Read error: Connection reset by peer)[05:13:09] *** Lucretia <Lucretia!~Luke@pdpc/supporter/active/lucretia> has joined ##vulkan[05:26:07] *** David3k <David3k!~David3k@120.29.73.145> has joined ##vulkan[06:04:56] *** d3x0r <d3x0r!~d3x0r@ip174-72-226-164.lv.lv.cox.net> has quit IRC (Read error: Connection reset by peer)[06:06:37] *** LunarJetman <LunarJetman!~fa_eb_fe@94.197.121.22.threembb.co.uk> has quit IRC (Ping timeout: 246 seconds)[06:50:36] *** jfpoole <jfpoole!~textual@24-246-14-142.cable.teksavvy.com> has quit IRC (Quit: My MacBook has gone to sleep. ZZZzzz…)[07:24:05] *** HZun_ <HZun_!~HZun@0x3ec721e2.osd.customer.dk.telia.net> has joined ##vulkan[07:27:02] *** HZun <HZun!~HZun@0x3ec721e2.osd.customer.dk.telia.net> has quit IRC (Ping timeout: 268 seconds)[07:30:23] *** slime <slime!~slime73@24.215.81.93> has quit IRC (Quit: This computer has gone to sleep)[07:51:57] *** HZun_ <HZun_!~HZun@0x3ec721e2.osd.customer.dk.telia.net> has quit IRC (Quit: Leaving)[09:13:09] <turol> i have question about semaphores[09:13:37] <turol> aqcuires a swapchain images, gives it a semaphore to signal when available[09:14:19] <turol> submits buffers, one of which waits the semaphore[09:14:32] <turol> the submit signals a fence which is waited sometime later[09:14:47] <turol> BUT I only have one semaphore and three frames (and three fences)[09:14:53] <turol> is this legal?[09:48:13] *** RicardasSim <RicardasSim!~RicardasS@78-63-172-44.static.zebra.lt> has quit IRC (Quit: Leaving)[10:18:14] *** vitimiti <vitimiti!~Celtor@unaffiliated/vitimiti> has 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<Deluxe!~Deluxe@212.4.150.151> has joined ##vulkan[16:38:30] *** mandeep <mandeep!~mandeep@unaffiliated/mandeepb> has joined ##vulkan[17:08:26] *** LunarJetman <LunarJetman!~fa_eb_fe@92.40.248.141.threembb.co.uk> has joined ##vulkan[17:36:32] *** cheakoirccloud <cheakoirccloud!uid293319@gateway/web/irccloud.com/x-nteizzqbucmqngnk> has joined ##vulkan[18:11:18] *** smitop <smitop!uid328768@gateway/web/irccloud.com/x-knmlcxdwdihibxlb> has quit IRC (Quit: Connection closed for inactivity)[18:19:36] *** RicardasSim <RicardasSim!~RicardasS@78-63-172-44.static.zebra.lt> has quit IRC (Quit: Leaving)[19:07:31] *** d3x0r <d3x0r!~d3x0r@ip174-72-226-164.lv.lv.cox.net> has quit IRC (Read error: Connection reset by peer)[19:37:04] <Ralith> turol: so long as you wait on the fence before using the same semaphore again, should be okay[19:37:20] <turol> currently i don't[19:37:30] <turol> it seems to have worked so far[19:37:50] <turol> but i have issues with my new laptop with nvidia 1060 and prime sync[19:37:57] <turol> but adding a fence wait didn't fix that[19:39:35] <Ralith> you mustn't allow a situation where you pass the semaphore to AcquireNextImage before it's been signaled, and had that signal consumed, from a previous invocation[19:39:54] <Ralith> "it seems to have worked so far" is the eternal refrain of the UB author :P[19:40:04] <turol> yep[19:40:13] <turol> no validation errors about it either[19:40:37] <turol> is it considered better to immediately wait for acquireNextImage fence or later?[19:41:21] <Ralith> if you wait on that fence immediately, you're stalling the pipeline; that might not matter to you, but it's considered bad practice[19:41:43] <turol> it seems dxvk also does that now[19:41:51] <Ralith> it results in your CPU and GPU both being idle for longer than necessary[19:42:27] <turol> does acquire stall the whole pipeline?[19:42:39] <turol> i do have multiple frames in flight[19:43:23] <Ralith> waiting on a fence immediately after submitting it to AcquireNextImage will stall the pipeline[19:44:49] <Ralith> (well, depending on impl details, but it certainly can)[19:48:51] <Ralith> I think the optimal architecture is to have one acquire-related semaphore and fence per frame, then each frame, call WaitForFences on the full set with waitAll = false; then search the set for a signaled fence, and use it and its matching semaphore[19:49:36] <Ralith> (would love to know if there's a better way)[19:50:54] <turol> interesting idea[19:50:59] <turol> will have to try that[19:51:28] <Ralith> note that the semaphore/fence pair there isn't strongly associated with a particular frame, you're searching the whole set each time[19:53:18] <turol> https://devtalk.nvidia.com/default/topic/1044496/linux/hangs-freezes-when-vulkan-v-sync-vk_present_mode_fifo_khr-is-enabled/post/5316701/#5316701[19:53:34] *** Deluxe <Deluxe!~Deluxe@212.4.150.151> has quit IRC (Remote host closed the connection)[19:53:34] <turol> it happens for other people too with other programs[19:55:22] *** Deluxe <Deluxe!~Deluxe@212.4.150.151> has joined ##vulkan[19:57:20] *** ville <ville!~ville@212-149-214-47.bb.dnainternet.fi> has quit IRC (Quit:)[19:57:58] <Ralith> sounds like a buggy driver, regardless of anything else[19:58:31] <Ralith> any reason you're not using mailbox mode?[19:58:38] <turol> nvidia doesn't support it[19:58:55] <Ralith> oh, I had no idea :([19:59:14] <turol> my code will use try to use it in some cases[19:59:21] <turol> but currently it picks fifo first[19:59:34] <turol> moving mailbox up didn't help[20:00:59] <Ralith> https://vulkan.gpuinfo.org/displayreport.php?id=5339#presentmodes seems like mailbox is supported just fine?[20:01:27] <turol> not on linux it isn't[20:01:36] <turol> neither my laptop nor desktop lists it[20:02:30] <Ralith> well that sucks[20:04:36] *** mandeep <mandeep!~mandeep@unaffiliated/mandeepb> has quit IRC (Remote host closed the connection)[20:06:57] *** ryp <ryp!ryp@gateway/vpn/privateinternetaccess/ryp> has 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