178223 2017-10-12 12:09:53 -0700 WebGL clamps drawingBufferWidth to 4096 pixels on a 5120 monitor/canvas 2017-10-18 10:15:38 -0700 1 1 1 Unclassified WebKit WebGL Safari 11 Mac macOS 10.12 RESOLVED FIXED InRadar P2 Major --- 1 alecazam123 dino buildbot cdumez dino esprehn+autocc graouts graouts gyuyoung.kim jonlee kondapallykalyan michael.herzog ryanhaddad oldest_to_newest 1359663 0 323543 alecazam123 2017-10-12 12:09:53 -0700 Created attachment 323543 Example showing clamping of WebGL renderBuffer Safari currently clamps the WebGL context to 4096 pixels horizontally and vertically. This is what Chrome/Firefox used to do, but they made the clamp on total pixels (4k x 4k) instead of per side. It looks like the WebKit implementation is using the old behavior. This is problematic on both 5K displays including the 5K iMac. Enclosed is a simple WebGL sample. Expand the window on a 5K display, and at a canvas size of 4097 pixels, you'll see a jump in the color and then aliasing bands. The drawingBufferWidth is clamped to 4096 pixels, and the checkerboard pattern is non-uniformly scaled up to 5120 pixels if you expand the browser fully or go fullscreen. This is problematic for design tools like ours, where we rely on pixel precision. Now the experience on a 5K display will be letterboxed bars around the interactive canvas when the UI is hidden. You can see this in figma.com rendering on 5K monitor with "Show UI" disabled. We would prefer to not have to wait for a long update cycle (another OSX release) on WebKit to see this corrected. 1361134 1 dino 2017-10-16 22:42:40 -0700 <rdar://problem/34597567> 1361136 2 323996 dino 2017-10-16 22:45:28 -0700 Created attachment 323996 Patch 1361144 3 323996 graouts 2017-10-16 23:05:44 -0700 Comment on attachment 323996 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=323996&action=review > LayoutTests/fast/canvas/webgl/large-drawing-buffer-resize.html:56 > +}, false); You can drop this parameter. 1361145 4 dino 2017-10-16 23:22:50 -0700 Committed r223459: <https://trac.webkit.org/changeset/223459> 1361266 5 323996 jonlee 2017-10-17 09:38:46 -0700 Comment on attachment 323996 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=323996&action=review > Source/WebCore/html/canvas/WebGLRenderingContextBase.cpp:-851 > - maxSize = std::min(maxSize, sizeUpperLimit); Why was this limit here in the first place? Should we restrict the size based on the device? 1361327 6 ryanhaddad 2017-10-17 11:21:56 -0700 LayoutTest webgl/1.0.2/conformance/canvas/drawingbuffer-static-canvas-test.html is failing after this change: https://build.webkit.org/results/Apple%20El%20Capitan%20Release%20WK1%20(Tests)/r223462%20(5490)/results.html https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=webgl%2F1.0.2%2Fconformance%2Fcanvas%2Fdrawingbuffer-static-canvas-test.html 1361331 7 ryanhaddad 2017-10-17 11:39:41 -0700 The test for this change is timing out on iOS 11 Release bots, failing on iOS 11 Debug: Release: https://build.webkit.org/results/Apple%20iOS%2011%20Simulator%20Release%20WK2%20(Tests)/r223553%20(595)/results.html Debug: https://build.webkit.org/builders/Apple%20iOS%2011%20Simulator%20Debug%20WK2%20(Tests)/builds/425 --- /Volumes/Data/slave/ios-simulator-11-debug-tests-wk2/build/layout-test-results/fast/canvas/webgl/large-drawing-buffer-resize-expected.txt +++ /Volumes/Data/slave/ios-simulator-11-debug-tests-wk2/build/layout-test-results/fast/canvas/webgl/large-drawing-buffer-resize-actual.txt @@ -1,5 +1,5 @@ -Original drawing buffer: 5000 x 5000 +Original drawing buffer: 4096 x 4096 -Resized drawing buffer: 5001 x 5001 +Resized drawing buffer: 4096 x 4096 1361343 8 ryanhaddad 2017-10-17 11:49:17 -0700 Reverted r223459 for reason: This change introduced LayoutTest failures. Committed r223563: <https://trac.webkit.org/changeset/223563> 1361356 9 dino 2017-10-17 12:18:02 -0700 Committed r223567: <https://trac.webkit.org/changeset/223567> 1361367 10 ryanhaddad 2017-10-17 12:46:36 -0700 (In reply to Dean Jackson from comment #9) > Committed r223567: <https://trac.webkit.org/changeset/223567> Thanks for updating the TestExpectations for iOS. Was anything done to address the webgl/1.0.2/conformance/canvas/drawingbuffer-static-canvas-test.html failure on macOS? 1361383 11 dino 2017-10-17 13:17:00 -0700 (In reply to Ryan Haddad from comment #10) > (In reply to Dean Jackson from comment #9) > > Committed r223567: <https://trac.webkit.org/changeset/223567> > Thanks for updating the TestExpectations for iOS. Was anything done to > address the > webgl/1.0.2/conformance/canvas/drawingbuffer-static-canvas-test.html failure > on macOS? No, I didn't see that one. I'll fix it now. 1361384 12 dino 2017-10-17 13:18:45 -0700 (In reply to Jon Lee from comment #5) > Comment on attachment 323996 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=323996&action=review > > > Source/WebCore/html/canvas/WebGLRenderingContextBase.cpp:-851 > > - maxSize = std::min(maxSize, sizeUpperLimit); > > Why was this limit here in the first place? Should we restrict the size > based on the device? I think this was mostly there because older hardware had problems with large buffers, but we still identify that hardware in another place. Note that this was only being applied on resize, so it was still possible to create such large buffers. i.e. we were not protecting it properly anyway 1361759 13 michael.herzog 2017-10-18 10:15:38 -0700 *** Bug 162604 has been marked as a duplicate of this bug. *** 323543 2017-10-12 12:09:53 -0700 2017-10-12 12:09:53 -0700 Example showing clamping of WebGL renderBuffer checkerboard.html text/html 2410 alecazam123 PGJvZHkgc3R5bGU9Im92ZXJmbG93OmhpZGRlbjsiPjwvYm9keT4KPHNjcmlwdD4KKGZ1bmN0aW9u KCkgewogIGZ1bmN0aW9uIG1haW4oKSB7CiAgICAvLyBBbiBleGFtcGxlIHRoYXQgc2hvd3MgU2Fm YXJpL1dlYktpdCBjbGFtcGluZyB0byA0MDk2cHggb24gYSA1MTIwcHggZGlzcGxheS4gIEV4cGFu ZCB0aGUgY2FudmFzIHVudGlsCiAgICAvLyBhbmQgdGhlIGNvbG9yIHNoaWZ0IGFuZCBhbGlhc2Vk IGJhbmRpbmcgb2Ygbm9uLXVuaWZvcm0gc2NhbGluZyBhcmUgZXZpZGVudCBhdCA0MDk3IHB4IG9y IGJpZ2dlci4KICAgIC8vIFRoaXMgZG9lcyBub3QgaGFwcGVuIGluIENocm9tZS9GaXJlZm94LCBz aW5jZSB0aG9zZSBjbGFtcCB0byA0MDk2eDQwOTYgcGl4ZWxzID0gNjRNQi4gIEV2ZW4gd2l0aCB0 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