229989 2021-09-07 02:53:27 -0700 WebGL scissor drawing results have changed in iOS 15 beta 2022-04-14 02:03:09 -0700 1 1 1 Unclassified WebKit WebGL Safari Technology Preview iPhone / iPad Other NEW https://bugs.webkit.org/show_bug.cgi?id=230618 InRadar P2 Normal --- 1 zproject.develop webkit-unassigned dino gman kbr kkinnunen kpiddington webkit-bug-importer oldest_to_newest 1790920 0 zproject.develop 2021-09-07 02:53:27 -0700 In WebGLRenderingContext.scissor(), the drawing result when width or height are set to 0 has changed from iOS15. Until iOS14: Nothing is drawn From iOS15: All drawn 1791260 1 kbr 2021-09-07 16:24:08 -0700 Sounds like a potential regression in 1791261 2 kbr 2021-09-07 16:24:42 -0700 (oops, didn't mean to press "enter") Sounds like a potential regression in ANGLE's Metal backend. Is this tested in the conformance suite? 1791874 3 437740 kkinnunen 2021-09-09 06:37:17 -0700 Created attachment 437740 test case to observe gl.scissor(0,0,0,0); appers to work 1791875 4 kkinnunen 2021-09-09 06:38:10 -0700 Cannot reproduce the problem with brief tests. Takuya Yamazaki, would you be able to upload a reproduction test case for the problem? 1793242 5 webkit-bug-importer 2021-09-14 02:54:23 -0700 <rdar://problem/83095006> 1799274 6 kkinnunen 2021-10-01 06:50:33 -0700 To the original reporter: If you are using preserveDrawingBuffer: true, then you might try if setting that to false affects the result. If so, then this would be related to bug 230618 1861424 7 zproject.develop 2022-04-14 02:03:09 -0700 Sorry for the delay in confirming this. This issue was fixed in at least iOS 15.4. It was not fixed in iOS 15.2. We are not aware of iOS 15.3. 437740 2021-09-09 06:37:17 -0700 2021-09-09 06:37:17 -0700 test case to observe gl.scissor(0,0,0,0); appers to work webgl-create.html text/html 385 kkinnunen PGJvZHk+CjxjYW52YXMgaWQ9ImMiPjwvY2FudmFzPgo8c2NyaXB0IHR5cGU9InRleHQvamF2YXNj cmlwdCI+CnZhciBjID0gZG9jdW1lbnQuZ2V0RWxlbWVudEJ5SWQoImMiKTsKZG9jdW1lbnQub25j bGljayA9IGZ1bmN0aW9uKCkgewogICAgdmFyIGdsID0gYy5nZXRDb250ZXh0KCJ3ZWJnbCIpOwog ICAgZ2wuc2Npc3NvcigwLDAsMCwwKTsKICAgIGdsLmVuYWJsZShnbC5TQ0lTU09SX1RFU1QpOwog ICAgZ2wuY2xlYXJDb2xvcigwLjAsIDEuMCwgMC4wLCAxLjApOwogICAgZ2wuY2xlYXIoZ2wuQ09M T1JfQlVGRkVSX0JJVCk7CiAgICBjb25zb2xlLmxvZygiY2xlYXJlZCA6ICIgKyBnbC5nZXRQYXJh bWV0ZXIoZ2wuQ09MT1JfQ0xFQVJfVkFMVUUpKTsKCn0KPC9zY3JpcHQ+Cg==