[Mesa-dev] [Bug 33934] glBlitFramebuffer could have a fast path if there's no scaling

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=33934

--- Comment #1 from Neil Roberts <neil at linux.intel.com> 2011-02-05 05:51:49 PST ---
Created an attachment (id=42961)
 View: https://bugs.freedesktop.org/attachment.cgi?id=42961
 Review: https://bugs.freedesktop.org/review?bug=33934&attachment=42961

meta: Try using glCopyTexSubImage2D in _mesa_meta_BlitFramebuffer

In the case where glBlitFramebuffer is being used to copy to a texture
without scaling it is faster if we can use the hardware to do a blit
rather than having to do a texture render. In most of the drivers
glCopyTexSubImage2D will use a blit so this patch makes it check for
when glBlitFramebuffer is doing a simple copy and then divert to
glCopyTexSubImage2D.

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