GL timer queries (EXT_disjoint_timer_query versus EXT_disjoint_timer_query_webgl2)

[Robert Goulet]

Hi all,

has anyone managed to get GL disjoint timer queries to work in Chrome?

It appears that in Chrome I have the extension EXT_disjoint_timer_query_webgl2, while in Firefox I get the extension EXT_disjoint_timer_query. Also it seems we'd need to use regular GL query functions instead of GL query EXT functions when EXT_disjoint_timer_query_webgl2 is available, which Emscripten doesn't account for. I tried to hack Emscripten to enable EXT_disjoint_timer_query_webgl2 and use non-EXT GL query functions, but I still couldn't get them working in Chrome. However, EXT_disjoint_timer_query works fine in Firefox when using GL query EXT functions.

This is a bit of a mess, and most likely need to be cleaned up, but I wonder if anyone was able to use EXT_disjoint_timer_query_webgl2 at any point?

Thanks!

[Jukka Jylänki]

I have not yet had a chance to verify these extensions for Emscripten use. Can you find a non-Emscripten JavaScript example of EXT_disjoint_timer_query_webgl2 that works in Chrome? Perhaps that could be used as a starting point to base the implementation on.

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[Robert Goulet]

Nah couldn't find any working example, hence why I am asking here if anyone tried it before.

[Tarek Sherif]

I'm using EXT_disjoint_timer_query_webgl2 for my WebGL 2 library's GPU timer: https://github.com/tsherif/picogl.js/blob/master/src/timer.js