- From: Corentin Wallez <cwallez@google.com>
- Date: Fri, 17 Nov 2017 14:58:20 -0800
- To: Richard Schreyer <rschreyer@apple.com>
- Cc: Markus Siglreithmaier <m.siglreith@gmail.com>, public-gpu <public-gpu@w3.org>
- Message-ID: <CAGdfWNOfS3ztHcJviwp5GpDx1HMQ_pNzWDgukQ-WpmvtBYutmg@mail.gmail.com>
Buffered transitions update the state tracking synchronously when the command buffer is submitted to a queue. This means that for the use-case you described the user doesn't need to do anything to ensure ordering. On Fri, Nov 17, 2017 at 2:18 PM, Richard Schreyer <rschreyer@apple.com> wrote: > For buffered transitions, do those conceptually happen synchronously upon > submission to a queue, or does the user have to wait for some event to know > that they have taken effect? > > ie, if a user encodes and submits a buffered transition, and then does an > immediate transition, does anything need to happen between those two steps > to ensure ordering? > > On Nov 17, 2017, at 11:20 AM, Corentin Wallez <cwallez@google.com> wrote: > > Hey Markus, > > This is correct, NXT defers building the native API command buffer until > queue submit. There are pros and cons to it. Examples pros are being able > to work around more bugs, and have more flexibility in the implementation, > cons that it could increase latency (for VR). > > Cheers, > > Corentin > > On Fri, Nov 17, 2017 at 11:15 AM, Markus Siglreithmaier < > m.siglreith@gmail.com> wrote: > >> Hi, >> >> I'm having a small question regarding the implementation of memory >> barriers. In the proposal the previous resources states (D3D12) or access >> masks (Vulkan) are unknown at command buffer recording time and only known >> on actual queue submission if I understand it correctly. Would this require >> then to cache all commands internally and defer the actual command buffer >> calls until queue submission? >> >> Cheers, >> Markus >> >> Am 15.11.2017 um 05:51 schrieb Corentin Wallez: >> >> Hey all, >> >> We wrote some document to help everyone reason about NXT's proposals for >> memory barriers and resource upload /download. Unfortunately we still don't >> have a fleshed out proposal that minimizes the number of copies on UMA. >> Instead the docs focus on explaining our current design for resource >> upload/download and for memory barriers since they are very tied. >> Eventually we'll have these docs in MarkDown in some repo, either WebGPU's >> or NXT's. >> >> - NXT "memory barriers" >> <https://docs.google.com/document/d/1k7lPmxP7M7MMQR4g210lNC5TPwmXCMLgKOQWNiuJxzA> >> <- Please read this first as buffer mapping depends on it. >> - NXT buffer mapping >> <https://docs.google.com/document/d/1HFzMMvDGHFtTgjNT0j-0SQ1fNU9R7woZ4JuNJdAXBjg> >> >> Cheers, >> >> Corentin >> >> >> > >
Received on Friday, 17 November 2017 22:59:04 UTC