[Webkit-unassigned] [Bug 44339] texImage2D calls should avoid CPU readback of GPU textures if possible

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=44339





--- Comment #1 from Bill Baxter <wbaxter at google.com>  2011-06-09 13:53:39 PST ---
Created an attachment (id=96636)
 --> (https://bugs.webkit.org/attachment.cgi?id=96636&action=review)
A small test case for slow perf of texSubImage2D

I put together a little test case for this.
To see timing of calls to texSubImage2D with canvas as the data source, open up the console.   On newer Chrome with accelerated canvas, times often go up to 2 or 3 or as high as 6.  With previous versions of Chrome that did operations like text rendering in software, the time is consistently 1 ms max.  The disparity gets worse as the GPU pipeline gets more and more full.  In an app that really taxes the GPU, the times can be tens of msec.

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