237533 2022-03-07 08:23:10 -0800 iOS/iPad 15.3.1 slow drawElements with TRIANGLE_FAN mode 2022-10-11 05:14:50 -0700 1 1 1 Unclassified WebKit WebGL Safari 15 iPhone / iPad iOS 15 NEW InRadar P2 Normal --- 231180 1 msokalski webkit-unassigned dino gman johncunningham kbr kkinnunen kpiddington webkit-bug-importer oldest_to_newest 1848763 0 msokalski 2022-03-07 08:23:10 -0800 On iOS/iPad 15.3.1 gl.drawElements with gl.UNSIGNED_INT index buffer containing ~0 to restart gl.TRIANGLE_FAN geometry is incredibly slow. I haven't checked UNSIGNED_SHORT, UNSIGNED_BYTE types but switching to gl.TRIANGLES without primitive restarts works OK. 1848853 1 kkinnunen 2022-03-07 11:15:53 -0800 Thanks for the report. If you have a self contained test case, feel free to attach / link that, it always helps. (Primitive restart is "emulated" when running on Metal, and the implementation might not be as tuned as the older OpenGL-based implementation) 1849201 2 454105 msokalski 2022-03-08 05:01:55 -0800 Created attachment 454105 gl.drawElements primitive restart / regular performance comparison 1849203 3 msokalski 2022-03-08 05:03:22 -0800 You're welcome Kimmo. Thank you for letting me know it has to be emulated in metal. Please find performance comparison attached. Note, adding burst loop was necessary to show the difference. If I'd call gl.drawElements simply once per frame, there was no performance difference between TRIANGLES w/o restarts and TRIANGLE_FAN with restarts. 1849222 4 msokalski 2022-03-08 05:50:08 -0800 After playing a while with the test case, I've noticed TRIANGLE_STRIP with primitive restart IS NOT affected. 1849223 5 454113 msokalski 2022-03-08 05:51:27 -0800 Created attachment 454113 Added TRIANGLE_STRIP to the test 1849241 6 msokalski 2022-03-08 06:55:52 -0800 Finally it appears the problem has nothing to do with primitive restarts. I've narrowed regression to drawElements with mode=TRIANGLE_FAN. drawArrays is NOT AFFECTED. 1849243 7 454117 msokalski 2022-03-08 06:57:29 -0800 Created attachment 454117 drawElements with mode = TRIANGLE_STRIP vs TRIANGLE_FAN vs TRIANGLES 1850154 8 webkit-bug-importer 2022-03-10 10:17:26 -0800 <rdar://problem/90106467> 1860270 9 msokalski 2022-04-11 06:35:49 -0700 Still reproducible on iOS/iPad 15.4.1 1902776 10 msokalski 2022-10-03 02:26:19 -0700 Still reproducible on iOS/iPad 15.7 1904056 11 msokalski 2022-10-07 08:26:18 -0700 Disabling WebGL via Metal solves the problem 1904738 12 kkinnunen 2022-10-11 01:27:35 -0700 Thanks for continuing to investigate. I filed upstream ANGLE bug at: https://bugs.chromium.org/p/angleproject/issues/detail?id=7748 Metal does not support TRIANGLE_FAN drawing mode natively. ANGLE emulates it. The GPU implementation of the emulation is turned off when primitive restart is supported. For WebGL2 primitive restart is enabled. To get an idea of the perf difference after the emulation is fixed to work with primitive restart, you can try to change the test case: - use WebGL1 or - change to drawArrays, where the emulation generates the emulated buffer once per draw after modification. 1904753 13 msokalski 2022-10-11 03:58:28 -0700 Thanks Kimmo, Please note, performance issue happens also in drawArrays with triangle fan mode. (last attachment) 1904754 14 msokalski 2022-10-11 04:01:13 -0700 Oops, I messed drawArrays / drawElements test cases, I'll re-check what's going on ... 1904758 15 msokalski 2022-10-11 05:14:50 -0700 So, you are right, that's only drawElements issue, I'm sorry for making unnecessary comments :( 454105 2022-03-08 05:01:55 -0800 2022-03-08 05:01:55 -0800 gl.drawElements primitive restart / regular performance comparison test_prim_restart.html text/html 9533 msokalski 77u/PCFET0NUWVBFIGh0bWw+DQoNCjxodG1sIGxhbmc9ImVuIiB4bWxucz0iaHR0cDovL3d3dy53 My5vcmcvMTk5OS94aHRtbCI+DQo8aGVhZD4NCiAgICA8bWV0YSBjaGFyc2V0PSJ1dGYtOCIgLz4N CiAgICA8dGl0bGU+UXVpdGUgRWRneSBUZXN0PC90aXRsZT4NCg0KICAgIDxzY3JpcHQgaWQ9InRo ZV92ZXJ0ZXhfc2hhZGVyIiB0eXBlPSJzaGFkZXIvZ2xzbCI+DQogICAgICAgIGxheW91dChsb2Nh dGlvbiA9IDApIGluIHZlYzIgdmVydDsNCiAgICAgICAgb3V0IGxvd3AgdmVjNCBjb2xvcjsNCg0K ICAgICAgICB2b2lkIG1haW4oKQ0KICAgICAgICB7DQogICAgICAgICAgICBnbF9Qb3NpdGlvbiA9 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