205665 2019-12-31 14:35:05 -0800 REGRESSION (r253926): webgl/2.0.0/conformance2/rendering/clipping-wide-points.html is failing 2020-01-22 15:45:14 -0800 1 1 1 Unclassified WebKit WebGL WebKit Local Build Unspecified Unspecified ASSIGNED https://bugs.webkit.org/show_bug.cgi?id=205483 InRadar P2 Normal --- 1 ap kbr dino jdarpinian kbr webkit-bug-importer oldest_to_newest 1602015 0 ap 2019-12-31 14:35:05 -0800 webgl/2.0.0/conformance2/rendering/clipping-wide-points.html started to fail 100% after the switch to ANGLE on some hardware/software configurations (I think that it fails on all IG models, but didn't check carefully). https://results.webkit.org/?suite=layout-tests&test=webgl%2F2.0.0%2Fconformance2%2Frendering%2Fclipping-wide-points.html The diff appears to say that it's actually passing on IG and failing elsewhere? @@ -1,15 +1,5 @@ This test runs the WebGL Test listed below in an iframe and reports PASS or FAIL. Test: ../../resources/webgl_test_files/conformance2/rendering/clipping-wide-points.html -[ 1: PASS ] getError was expected value: NO_ERROR : Should be no errors after setting up program -[ 2: PASS ] should be 0,255,0 -[ 3: PASS ] getError was expected value: NO_ERROR : Should be no errors after running one test case -[ 4: FAIL ] should be 0,255,0 at (0, 0) expected: 0,255,0 was 255,0,0 -[ 5: PASS ] getError was expected value: NO_ERROR : Should be no errors after running one test case -[ 6: PASS ] should be 0,255,0 -[ 7: PASS ] getError was expected value: NO_ERROR : Should be no errors after running one test case -[ 8: FAIL ] should be 0,255,0 at (0, 0) expected: 0,255,0 was 255,0,0 -[ 9: PASS ] getError was expected value: NO_ERROR : Should be no errors after running one test case -[ 10: PASS ] successfullyParsed is true -[ FAIL ] 2 failures reported +[ PASS ] All tests passed 1602016 1 webkit-bug-importer 2019-12-31 14:35:15 -0800 <rdar://problem/58257017> 1602017 2 ap 2019-12-31 14:40:51 -0800 The test used to pass before r253926, but the change added a failing expectation for it. So what this means is that the test actually regressed on Macs with AMD graphics. Here are some of the affected models: MacPro6,1 MAcPro7,1 iMac15,1 iMac17,1 iMac18,2 iMac18,3 MacBookPro11,5 MacBookPro13,3 1602578 3 kbr 2020-01-03 14:09:44 -0800 Unfortunately this test uncovers some longstanding behavioral differences between AMD GPUs and other vendors'. It's been failing in Chromium for a long time: see https://bugs.chromium.org/p/chromium/issues/detail?id=642822 . Likely we'll have to remove this test from the WebGL 2.0 conformance suite, since the emulation path to make this work on AMD GPUs would likely be too slow. 1609801 4 kbr 2020-01-22 15:45:06 -0800 Let me take this bug to follow through on it.