135419 2014-07-30 10:37:55 -0700 Black canvas when using RTL/webGL on Google Maps 2014-07-30 14:25:25 -0700 1 1 1 Unclassified WebKit WebGL 528+ (Nightly build) Unspecified Unspecified RESOLVED INVALID http://google.com/maps?force=webgl&hl=ar P2 Normal --- 1 mdavids webkit-unassigned achristensen bfulgham dino mitz roger_fong simon.fraser oldest_to_newest 1025733 0 mdavids 2014-07-30 10:37:55 -0700 When launching in RTL languages, the WebGL canvas is always black. This doesn't happen for our 2D canvas rendering, and doesn't happen in LTR languages. Compare: http://google.com/maps?force=webgl&hl=ar (RTL, WebGL, bad) http://google.com/maps?force=webgl&hl=en (LTR, WebGL, looks good!) http://google.com/maps?force=canvas&hl=at (RTL, Canvas2D, good) 1025742 1 bfulgham 2014-07-30 10:53:21 -0700 What operating system version are you running when you encounter this? Is it a shipping Mavericks version, or the developer seed for the upcoming OS? 1025744 2 achristensen 2014-07-30 10:58:35 -0700 I think this is a problem in your content. Switching the user agent to Google Chrome -- Mac makes it no longer happen. I see the map for a moment, then it smoothly fades to black. I'm not familiar with the inner workings of Google Maps. Do you have any idea what would cause this? 1025753 3 mdavids 2014-07-30 11:19:09 -0700 My OS: 10.9.4 Retina MBP GPU: NVIDIA GeForce GT 650M 1024 MB Alex, the initial map you see is image tags showing raster content. The WebGL context never shows content, it's always black. 1025754 4 mdavids 2014-07-30 11:19:28 -0700 Nightly version: Version 7.0.5 (9537.77.4, r171650) 1025757 5 bfulgham 2014-07-30 11:51:49 -0700 Seems to be limited to Retina hardware. 1025762 6 mdavids 2014-07-30 12:24:28 -0700 A clue: In non-Safari high DPI browsers, we scale the canvas using style.width/style.height. If you emulate the Chrome UA, you'll see that it does render, but not with correct crisp text. In Safari, we scale using a webkit-transform of scale(.5, .5), which yields sharp text in LTR languages but a black canvas in RTL languages. 1025776 7 mdavids 2014-07-30 13:54:02 -0700 This is a bug in the maps code. We're not setting the origin of the transform in RTL languages.