73257 2011-11-28 14:57:12 -0800 Canvas to WebGL Texture path Broken 2011-12-06 19:43:53 -0800 1 1 1 Unclassified WebKit WebGL 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 twiz twiz eric jamesr rniwa senorblanco webkit.review.bot oldest_to_newest 510223 0 twiz 2011-11-28 14:57:12 -0800 Repeatedly using the same canvas-2d element as a source for WebGL textures results in incorrect results. The content of the 2d canvas during the first texture copy is the content that is used for all subsequent texture uploads. This is because the software snapshot of the canvas contents, HTMLCanvasElement::m_copied is never reset when the hardware accelerated path is enabled. Summary of the problem: - CanvasRenderingContext2D::didDraw will early-out when the accelerated path is enabled. - The early out prevents HTMLCanvasElement::didDraw from being called. - HTMLCanvasElement::m_copied image is never reset. - Subsequent accesses to the canvas for texture contents will return the copied image, which contains the contents of the first pass. See original chromium issue here: crbug.com/105119 510240 1 116833 twiz 2011-11-28 15:07:39 -0800 Created attachment 116833 Patch 510246 2 116833 twiz 2011-11-28 15:10:00 -0800 Comment on attachment 116833 Patch Removing the early out, as per comments on crbug.com/105119. 510266 3 twiz 2011-11-28 15:27:21 -0800 (In reply to comment #2) > (From update of attachment 116833 [details]) > Removing the early out, as per comments on crbug.com/105119. Not to reviewers: HTMLCanvasElement::didDraw can end up calling RenderBox::repaintRectangle. Is this a problem for the accelerated path? 510282 4 jamesr 2011-11-28 15:45:11 -0800 Can we get a test? 510290 5 jamesr 2011-11-28 15:54:56 -0800 (In reply to comment #3) > (In reply to comment #2) > > (From update of attachment 116833 [details] [details]) > > Removing the early out, as per comments on crbug.com/105119. > > Not to reviewers: HTMLCanvasElement::didDraw can end up calling RenderBox::repaintRectangle. Is this a problem for the accelerated path? Accelerated canvases map to two layers in the composited tree, one layer for the <canvas> contents proper (called the m_contentsLayer in GraphicsLayerCA/GraphicsLayerChromium) and one for the element (called m_layer in GraphicsLayerCA/GraphicsLayerChromium). The former has all of the rendering results of the 2d context, the latter has things like the background color of the <canvas> element, borders, etc. The common case is that the <canvas> element itself does not have a border or a background or anything like that, which is optimized by RenderLayerBacking::isSimpleContainerCompositingLayer(). When we draw into the canvas in the accelerated path the m_contentsLayer is marked as needing a display via the contentChanged() call. Currently we always mark the entire layer as needing a display and don't attempt to track which part of the canvas the draw call happened on, although it may be useful to track damage more tightly in the future. Calling RenderBox::repaintRectangle() on the canvas will invalidate the m_layer. In the common case this layer is a optimized away so nothing should happen. However if the <canvas> doesn't fall into the simple container optimization, then invalidating this layer will force us to do a software repaint and upload of the drawn region on the next frame. This is pretty wasteful. You can check if this optimization is happening on a given page by checking the drawsContent bit. I think it'd be better to avoid calling didDraw() in this case. Maybe we should add an explicit call that drops the copiedImage but doesn't trigger a repaintRectangle() call? 511108 6 117045 twiz 2011-11-29 14:29:52 -0800 Created attachment 117045 Patch 511109 7 117045 twiz 2011-11-29 14:30:58 -0800 Comment on attachment 117045 Patch Patch addresses comments and adds a layout test that fails before application of the fix. 511223 8 117045 jamesr 2011-11-29 16:54:31 -0800 Comment on attachment 117045 Patch Great! R=me 511759 9 117196 twiz 2011-11-30 08:13:14 -0800 Created attachment 117196 Patch 511762 10 117196 twiz 2011-11-30 08:14:55 -0800 Comment on attachment 117196 Patch The same patch as previously, except with a slightly modified test. The previous test was not always failing previous to my patch because the compositor was not launching before the completion of the test. The new test uses the z-transform trick to force the compositor from the beginning. 511765 11 senorblanco 2011-11-30 08:18:56 -0800 Looks great. Thanks for your diligence wrt testing. r=me 512355 12 117196 webkit.review.bot 2011-11-30 19:26:02 -0800 Comment on attachment 117196 Patch Clearing flags on attachment: 117196 Committed r101592: <http://trac.webkit.org/changeset/101592> 512356 13 webkit.review.bot 2011-11-30 19:26:06 -0800 All reviewed patches have been landed. Closing bug. 514043 14 eric 2011-12-02 13:04:11 -0800 This is causing a failure on lion: http://build.webkit.org/results/Lion%20Intel%20Release%20(Tests)/r101592%20(3105)/fast/canvas/webgl/canvas-2d-webgl-texture-pretty-diff.html 516018 15 twiz 2011-12-06 10:35:42 -0800 (In reply to comment #14) > This is causing a failure on lion: > http://build.webkit.org/results/Lion%20Intel%20Release%20(Tests)/r101592%20(3105)/fast/canvas/webgl/canvas-2d-webgl-texture-pretty-diff.html Investigating the failure. Has it since been suppressed? 516452 16 rniwa 2011-12-06 19:43:53 -0800 The test has been failing on Snow Leopard ever since it was added: http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=fast%2Fcanvas%2Fwebgl%2Fcanvas-2d-webgl-texture.html&group=%40ToT%20-%20webkit.org 116833 2011-11-28 15:07:39 -0800 2011-11-29 14:29:48 -0800 Patch bug-73257-20111128180737.patch text/plain 1755 twiz SW5kZXg6IFNvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBTb3VyY2UvV2Vi Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDEwMTI4MikKKysrIFNvdXJjZS9XZWJDb3JlL0NoYW5n ZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDE1IEBACisyMDExLTExLTI4ICBKZWZmIFRp bWFudXMgIDx0d2l6QGNocm9taXVtLm9yZz4KKworICAgICAgICBSZW1vdmUgYW4gZWFybHkgcmV0 dXJuIHRoYXQgd2FzIHByZXZlbnRpbmcgSFRNTENhbnZhc0VsZW1lbnQ6OmRpZERyYXcgbm90aWZp Y2F0aW9ucworICAgICAgICBmcm9tIGJlaW5nIHRyaWdnZXJlZCB3aGVuIGFjY2VsZXJhdGVkIGNv 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