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Eric Anholt wrote:
| On Fri, 2008-06-13 at 13:18 +0300, Timo Jyrinki wrote:
|> 2008/6/12 Eric Anholt <eric@anho...>:
|>> I'm really having a hard time caring until someone comes up with
|>> something other than a microbenchmark that has issues with teximage
|>> performance.
|> I'm not sure if it's about teximage performance, but try (whoever
|> interested) rotating a cube in compiz when playing windowed (not
|> fullscreen) textured video in eg. mplayer or totem. At least currently
|> it seems windowed, textured video is unusably slow together with
|> compiz, which means I'm forcing the 965G overlay feature into use to
|> have usable video playback performance.
|
| If compiz is doing TexImage for texture from pixmap, that also means

I what Timo is suggesting is that this path uses TexImage2D (hopefully
TexSubImage2D) to upload the frames of video as they are decoded.

| that it's reading the data out of the framebuffer.  The reading data out
| should be the slow part.  sysprof would confirm for you.

Which would be total insanity.  Any application that is going to use
copy-to-texture should use CopyTexSubImage2D.  Notice that I said
CopyTex*Sub*Image2D, not CopyTexImage2D.  Any other usage is not the
performance path on any driver.

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