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
Sounds like a potential regression in
(oops, didn't mean to press "enter") Sounds like a potential regression in ANGLE's Metal backend. Is this tested in the conformance suite?
Created attachment 437740 [details] test case to observe gl.scissor(0,0,0,0); appers to work
Cannot reproduce the problem with brief tests. Takuya Yamazaki, would you be able to upload a reproduction test case for the problem?
<rdar://problem/83095006>
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
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.