[Webkit-unassigned] [Bug 42118] Some of the WebGL tests don't pass if GL_ARB_framebuffer_object extension is not present

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=42118





--- Comment #3 from Kenneth Russell <kbr at google.com>  2010-07-12 18:59:12 PST ---
It isn't 100% clear that the lack of ARB_framebuffer_object is the most specific root cause. The Mac port assumes EXT_framebuffer_object and uses those entry points, which appear to be present on the machine in question. Sam provided a diff between the GL extensions on a machine where the tests work and on the machine where they're failing. Attaching this list separately. Note that EXT_framebuffer_object is present, though EXT_framebuffer_blit and EXT_framebuffer_multisample aren't, so antialiasing won't work -- but the WebGL implementation should notice that and simply disable antialiasing.

There might be a problem, seen on Macs with older ATI drivers, using non-power-of-two textures as color attachments to framebuffer objects. On these older machines it was necessary to use a GL_TEXTURE_RECTANGLE_ARB texture for the WebGL back buffer.

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