218282 2020-10-28 05:45:12 -0700 rendering to an offscreen framebuffer alterates canvas display 2020-10-29 01:14:58 -0700 1 1 1 Unclassified WebKit WebGL Safari 14 iPhone / iPad Other RESOLVED DUPLICATE 218177 DoNotImportToRadar P1 Blocker --- 218177 1 zebontheweb kkinnunen dino jdarpinian kbr kkinnunen smoley oldest_to_newest 1702281 0 412522 zebontheweb 2020-10-28 05:45:12 -0700 Created attachment 412522 sample reproducing the pb See attached sample. 1/ create a canvas 2/ create an webgl context 3/ clear with black color 4/ create an offscreen framebuffer to render to a texture 5/ clear with black color in a setTimeout callback Result : the canvas switch to transparent Expected result : the canvas should remain black Maybe similar to https://bugs.webkit.org/show_bug.cgi?id=218177 or related bugs 1702383 1 smoley 2020-10-28 10:54:15 -0700 I can reproduce this on an iPad running iOS 14 GM, but this appears to be fixed on the iOS 14.2 Beta https://developer.apple.com/news/releases/?id=10132020b Are you able to reproduce this on the latest beta build as well? 1702386 2 kbr 2020-10-28 11:01:33 -0700 I think this is a duplicate of Bug 218177 which Kimmo just fixed. Kimmo, can you confirm? 1702512 3 zebontheweb 2020-10-28 15:05:49 -0700 (In reply to Smoley from comment #1) > I can reproduce this on an iPad running iOS 14 GM, but this appears to be > fixed on the iOS 14.2 Beta > https://developer.apple.com/news/releases/?id=10132020b > > Are you able to reproduce this on the latest beta build as well? I will give it a try on the real scenario failing, give me some time, we have a restricted number of iOS devices. Thanks. 1702645 4 kkinnunen 2020-10-29 01:14:58 -0700 Thanks for the report. With tip of the tree, the canvas is showing black on screen. Yes, this should be fixed by the fix in bug 218177. *** This bug has been marked as a duplicate of bug 218177 *** 412522 2020-10-28 05:45:12 -0700 2020-10-28 05:45:12 -0700 sample reproducing the pb ipad_sample.html text/html 2107 zebontheweb PCFkb2N0eXBlIGh0bWw+DQo8aHRtbD4NCiAgIDxib2R5Pg0KICAgICAgPGNhbnZhcyB3aWR0aCA9 ICI1MDAiIGhlaWdodCA9ICI1MDAiIGlkID0gIm15X0NhbnZhcyI+PC9jYW52YXM+DQoJCQ0KICAg ICAgPHNjcmlwdD4NCg0KICAgICAgICAgdmFyIGNhbnZhcyA9IGRvY3VtZW50LmdldEVsZW1lbnRC eUlkKCdteV9DYW52YXMnKTsNCiAgICAgICAgIHZhciBnbCA9IGNhbnZhcy5nZXRDb250ZXh0KCd3 ZWJnbCcpOw0KDQogICAgICAgICAvL2NyZWF0ZSBmcmFtZWJ1ZmZlciBmb3Igb2Zmc2NyZWVuIHJl bmRlcg0KICAgICAgICAgdmFyIGZyYW1lYnVmZmVyID0gZ2wuY3JlYXRlRnJhbWVidWZmZXIoKTsN CiAgICAgICAgIGdsLmJpbmRGcmFtZWJ1ZmZlciggZ2wuRlJBTUVCVUZGRVIsIGZyYW1lYnVmZmVy ICk7DQogICAgICAgICB2YXIgIHRleHR1cmUgPSBnbC5jcmVhdGVUZXh0dXJlKCk7DQogICAgICAg ICBnbC5iaW5kVGV4dHVyZSggZ2wuVEVYVFVSRV8yRCwgdGV4dHVyZSApOw0KICAgICAgICAgZ2wu dGV4SW1hZ2UyRCggZ2wuVEVYVFVSRV8yRCwgMCwgZ2wuUkdCQSwgY2FudmFzLndpZHRoLCBjYW52 YXMuaGVpZ2h0LCAwLCBnbC5SR0JBLCBnbC5VTlNJR05FRF9CWVRFLCBudWxsICk7DQogICAgICAg ICBnbC5mcmFtZWJ1ZmZlclRleHR1cmUyRCggZ2wuRlJBTUVCVUZGRVIsIGdsLkNPTE9SX0FUVEFD SE1FTlQwLCBnbC5URVhUVVJFXzJELCB0ZXh0dXJlLCAwICk7DQogICAgICAgICANCiAgICAgICAg IC8vc2ltcGxlIGNsZWFyIG9mIHRoZSBzY3JlZW4gb3IgdGV4dHVyZQ0KICAgICAgICAgdmFyIHJl bmRlciA9IGZ1bmN0aW9uKGlmcmFtZWJ1ZmZlcil7DQogICAgICAgICAgICBnbC5iaW5kRnJhbWVi dWZmZXIoIGdsLkZSQU1FQlVGRkVSLCBpZnJhbWVidWZmZXIgKTsNCiAgICAgICAgICAgIGdsLmNs ZWFyQ29sb3IoMC4wLCAwLjAsIDAuMCwgMS4wKTsNCiAgICAgICAgICAgIGdsLmNsZWFyKGdsLkNP TE9SX0JVRkZFUl9CSVQpOw0KICAgICAgICAgfQ0KDQogICAgICAgICAvL3R3byBiZWhhdmlvdXJz DQogICAgICAgICB2YXIgZmxhc2h5QmVoYXZpb3VyID0gdHJ1ZTsNCiAgICAgICAgIA0KICAgICAg ICAgaWYoZmxhc2h5QmVoYXZpb3VyKXsvL29uZSBvZmZzY3JlZW4gcmVuZGVyIHdpbGwgbWVzcyB0 aGUgc2NyZWVuLCB0aGUgb3ZlciB3aWxsIHJlc2V0IGl0IHRvIHRoZSByaWdodCB2aXN1YWwNCg0K ICAgICAgICAgICAgLy9yZXF1ZXN0QW5pbWF0aW9uRnJhbWUgbmVlZGVkIHRvIHJlcHJvZHVjZSBl dmVuIGlmIG5vIHJlbmRlciBpcyBkb25lDQogICAgICAgICAgICB2YXIgbWFpblJlbmRlckRvbmUg PSBmYWxzZTsNCiAgICAgICAgICAgIHZhciBhbmltYXRlID0gZnVuY3Rpb24oKXsNCiAgICAgICAg ICAgICAgIGlmKCFtYWluUmVuZGVyRG9uZSl7DQogICAgICAgICAgICAgICAgICByZW5kZXIoKTsv L3JlbmRlciB0byBzY3JlZW4NCiAgICAgICAgICAgICAgICAgIG1haW5SZW5kZXJEb25lID0gdHJ1 ZTsNCiAgICAgICAgICAgICAgIH0NCiAgICAgICAgICAgICAgIHJlcXVlc3RBbmltYXRpb25GcmFt ZShhbmltYXRlKTsNCiAgICAgICAgICAgIH0NCg0KICAgICAgICAgICAgdmFyIG9mZnNjcmVlblJl bmRlciA9IGZ1bmN0aW9uKCl7DQogICAgICAgICAgICAgICByZW5kZXIoZnJhbWVidWZmZXIpOy8v IHJlbmRlciBvZmZzY3JlZW4NCiAgICAgICAgICAgICAgIHNldFRpbWVvdXQob2Zmc2NyZWVuUmVu ZGVyLDUwMCk7DQogICAgICAgICAgICB9DQoNCiAgICAgICAgICAgIHJlcXVlc3RBbmltYXRpb25G cmFtZShhbmltYXRlKTsNCiAgICAgICAgICAgIHNldFRpbWVvdXQob2Zmc2NyZWVuUmVuZGVyLDUw MCk7DQoNCiAgICAgICAgIH1lbHNley8vb2Zmc2NyZWVuIHJlbmRlciBtZXNzIHRoZSBzY3JlZW4N Cg0KICAgICAgICAgICAgdmFyIG9mZnNjcmVlblJlbmRlciA9IGZ1bmN0aW9uKCl7DQogICAgICAg ICAgICAgICAgICByZW5kZXIoZnJhbWVidWZmZXIpOw0KICAgICAgICAgICAgfQ0KDQogICAgICAg ICAgICByZW5kZXIoKTsNCiAgICAgICAgICAgIHNldFRpbWVvdXQob2Zmc2NyZWVuUmVuZGVyLDUw MCk7DQoNCiAgICAgICAgIH0NCiAgICAgIDwvc2NyaXB0Pg0KICAgPC9ib2R5Pg0KPC9odG1sPg==