227723 2021-07-06 15:01:26 -0700 WebGL shader link error in iOS 15 beta: "Internal error compiling shader with Metal backend" 2021-08-12 13:31:38 -0700 1 1 1 Unclassified WebKit WebGL Safari Technology Preview iPhone / iPad Other RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=229050 InRadar P2 Normal --- 1 mturitzin kpiddington dino ews-watchlist kbr kkinnunen kondapallykalyan kpiddington webkit-bug-importer oldest_to_newest 1775106 0 mturitzin 2021-07-06 15:01:26 -0700 We are seeing this error (which is new in the iOS 15 beta) when linking some shader programs used by Figma's prototype viewer. I have personally repro'ed it on an iPad running iOS 15 (19A5281j). Shaders that previously compiled and linked without issue now fail when linking with this `getProgramInfoLog` message: "Internal error compiling shader with Metal backend. Please submit this shader, or website as a bug to https://bugs.webkit.org" I have put together a minimal repro that appears to demonstrate the issue is with usage of the comma operator (see repro steps below). (We have a shader minifier that in some cases replaces semicolons with commas.) I believe the usage below is valid GLSL syntax, and it does compile and link properly on prior versions of Safari and other browsers. Steps to Reproduce: 1. Run the following Javascript in Safari on iOS 15: (JSFiddle link: https://jsfiddle.net/9p1f3t5r/2/ ) ---------------------------------------------------------------------------------------- const VERTEX_SHADER_SOURCE = "void f(vec2 a) {} void main() { f(vec2(0.)), gl_Position = vec4(0.,0.,0.,1.); }"; // Vertex shader with comma (in main()) changed to semicolon. //const VERTEX_SHADER_SOURCE = "void f(vec2 a) {} void main() { f(vec2(0.)); gl_Position = vec4(0.,0.,0.,1.); }"; const FRAGMENT_SHADER_SOURCE = "void main() { gl_FragColor = vec4(0.); }"; const log = (msg) => { console.log(msg); document.body.innerHTML += "<p>" + msg + "</p>"; }; const canvas = document.createElement("canvas"); const gl = canvas.getContext("webgl"); const vertexShader = gl.createShader(gl.VERTEX_SHADER); gl.shaderSource(vertexShader, VERTEX_SHADER_SOURCE); gl.compileShader(vertexShader); if (!gl.getShaderParameter(vertexShader, gl.COMPILE_STATUS)) { log("error compiling vertex shader: " + gl.getShaderInfoLog(vertexShader)); } const fragmentShader = gl.createShader(gl.FRAGMENT_SHADER); gl.shaderSource(fragmentShader, FRAGMENT_SHADER_SOURCE); gl.compileShader(fragmentShader); if (!gl.getShaderParameter(fragmentShader, gl.COMPILE_STATUS)) { log("error compiling fragment shader: " + gl.getShaderInfoLog(fragmentShader)); } const program = gl.createProgram(); gl.attachShader(program, vertexShader); gl.attachShader(program, fragmentShader); gl.linkProgram(program); if (!gl.getProgramParameter(program, gl.LINK_STATUS)) { log("error linking program: " + gl.getProgramInfoLog(program)); } log("DONE"); ---------------------------------------------------------------------------------------- Expected Results: The shader program compiles/links without error. Actual Results: This error is logged when linking the program: "Internal error compiling shader with Metal backend. Please submit this shader, or website as a bug to https://bugs.webkit.org". An alternate version of the vertex shader with the usage of the comma operator in `main` replaced with a semicolon is included (commented out) in the repro code above. This change to the vertex shader causes the shader to compile/link without error. 1775113 1 webkit-bug-importer 2021-07-06 15:13:10 -0700 <rdar://problem/80233657> 1775132 2 432985 kpiddington 2021-07-06 16:19:40 -0700 Created attachment 432985 Patch 1775134 3 ews-watchlist 2021-07-06 16:20:54 -0700 Note that there are important steps to take when updating ANGLE. See https://trac.webkit.org/wiki/UpdatingANGLE 1775161 4 432985 dino 2021-07-06 18:14:27 -0700 Comment on attachment 432985 Patch Can we include a test? 1775378 5 433058 kpiddington 2021-07-07 12:03:30 -0700 Created attachment 433058 Patch for landing 1775394 6 ews-feeder 2021-07-07 12:35:49 -0700 Committed r279656 (239469@main): <https://commits.webkit.org/239469@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 433058. 1776077 7 kbr 2021-07-09 14:25:00 -0700 Note: filed https://github.com/KhronosGroup/WebGL/issues/3299 about upstreaming this test case to the WebGL conformance suite. 432985 2021-07-06 16:19:40 -0700 2021-07-07 12:03:28 -0700 Patch bug-227723-20210706161939.patch text/plain 1834 kpiddington U3VidmVyc2lvbiBSZXZpc2lvbjogMjc5NjI2CmRpZmYgLS1naXQgYS9Tb3VyY2UvVGhpcmRQYXJ0 eS9BTkdMRS9DaGFuZ2VMb2cgYi9Tb3VyY2UvVGhpcmRQYXJ0eS9BTkdMRS9DaGFuZ2VMb2cKaW5k ZXggY2UyNjE3ZjQyOWNkYWNiNmMwMDIwMmJhYTAyZWFlYmE1ZTI4MWE2Mi4uM2EzYTBlMGMyNzVj ZTU5MzlhMDEwNTQxZjNjNDYzNzBmOTMxOWYxOSAxMDA2NDQKLS0tIGEvU291cmNlL1RoaXJkUGFy dHkvQU5HTEUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9UaGlyZFBhcnR5L0FOR0xFL0NoYW5nZUxv ZwpAQCAtMSwzICsxLDE1IEBACisyMDIxLTA3LTA2ICBLeWxlIFBpZGRpbmd0b24gIDxrcGlkZGlu Z3RvbkBhcHBsZS5jb20+CisKKyAgICAgICAgV2ViR0wgc2hhZGVyIGxpbmsgZXJyb3IgaW4gaU9T IDE1IGJldGE6ICJJbnRlcm5hbCBlcnJvciBjb21waWxpbmcgc2hhZGVyIHdpdGggTWV0YWwgYmFj 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