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WebView makes NSOpenGLView glitchy on MacBook

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WebView makes NSOpenGLView glitchy on MacBook

Subject: WebView makes NSOpenGLView glitchy on MacBook
From: Dave Hayden <email@hidden>
Date: Mon, 15 Jan 2007 15:30:16 -0800

Here's a weird one. We were having problems with an NSOpenGLView subclass, where resizing the view filled the delta area with garbage-- but only on MacBooks, both Pro and.. Amateur? After further poking and prodding, I found that it only happens after we load a web page into a WebView. (!?) Here's a demonstration project:

  http://www.panic.com/~dave/GLGlitch.zip

Click "Zoom!", and the GL view resizes cleanly. Click "Load!" to load a web page, then "Zoom!" again and the resizing is now glitchy.

Note that the view is in a floating transparent window, and I'm running the animation from a separate thread, calling lockFocusIfCanDraw/drawRect:/unlockFocus. There's likely other ways I'm abusing and misusing GL as well.

Any ideas? I thought I'd post here first before going over to the OpenGL and WebKit lists.

Thanks!
-Dave

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