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Bug 2958 - For event timestamps, use high precision counter
Summary: For event timestamps, use high precision counter
Status: RESOLVED WONTFIX
Alias: None
Product: SDL
Classification: Unclassified
Component: events (show other bugs)
Version: HG 2.1
Hardware: All All
: P2 enhancement
Assignee: Sam Lantinga
QA Contact: Sam Lantinga
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2015-04-23 18:17 UTC by Mike Lawrence
Modified: 2019-11-17 06:39 UTC (History)
0 users

See Also:

Attachments
diff for suggested path (16.14 KB, text/plain)
2015-04-23 18:17 UTC, Mike Lawrence 		Details
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Description Mike Lawrence 2015-04-23 18:17:38 UTC 
Created attachment 2131 [details]
diff for suggested path

Simply requires replacement of "SDL_GetTicks()" with "SDL_GetPerformanceCounter()" in events/SDL_events.c and replacement of all instances of "Uint32 timestamp" with "Uint64 timestamp" in include/SDL_events.h. Diff for patch attached.
Comment 1 Sam Lantinga 2016-10-08 00:31:57 UTC 
Out of curiosity, what use case do you have for < 1ms resolution on the event timestamp, given that the timestamp is only when the last SDL_PumpEvents() call was made?
Comment 2 Mike Lawrence 2019-10-18 14:19:15 UTC 
(I thought I responded to Sam's question way back in 2016, but happeened across thread in my email just now and see that my response bounced, so I'm posting my response now)

I do cognitive science research that often involves measuring human response times where phenomena of interest may be on the order of merely several milliseconds. A higher precision event timestamp well help reduce noise and thereby improve statistical power. 

Note I've actually started using pyusb in a completely separate process to collect responses and their timestamps, so having the higher precision event timestamps in SDL isn't a big deal for me personally any more.
Comment 3 Sam Lantinga 2019-11-17 06:39:32 UTC 
Okay, thanks for the update!