234220 2021-12-12 16:40:15 -0800 Metal backend fails (Shadershowdown) 2021-12-13 00:04:12 -0800 1 1 1 Unclassified WebKit WebGL Safari 15 Unspecified Unspecified RESOLVED DUPLICATE 226660 P2 Normal --- 1 markus webkit-unassigned dino kbr kkinnunen oldest_to_newest 1823355 0 markus 2021-12-12 16:40:15 -0800 shader: https://www.shadertoy.com/view/flcSRB 1823410 1 kkinnunen 2021-12-13 00:04:12 -0800 Thanks for the report. This has been fixed and ships in iOS15.2 and some upcoming macOS release. Most likely this is bug 230472 or bug 226660. Resolving as bug 226660 with a guess that the MSL shader fails due to name conflict with GLSL shader function name "rand". *** This bug has been marked as a duplicate of bug 226660 ***