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In vaapi 1.1.0 (which confusingly is libva release 2.1.0), they
introduced a new surface export API that is more efficient, and
we've been supporting that and the old API ever since (Feb 2018).
If we drop support for the old API, we can do some fairly nice cleanup
of the code.
Note that the pkgconfig entries are explicitly versioned by the API
version and not the library version. I confirmed the upstream pkgconfig
files.
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In theory, using strstr() to search for extensions is a bad idea,
because some extension names might be prefixes for other names, so you
could get false positives. gl_check_extension() avoids this case.
It's not clear whether this is really needed; maybe not. Surely the EGL
committee is aware of these practices (many GL clients do this, which is
why it's widely considered bad practice), and would avoid defining new
extension names which contain existing names as sub-strings, but
whatever.
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Adding an ifdef mess to deal with insufficient system headers is kind of
a mess. It's easier to just provide the definitions manually. This sucks
a bit too, but it's the approach we've been using with OpenGL headers in
general, and I think that worked pretty well.
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On systems whose EGL headers do not define these extensions, the build
still failed due to missing ..._PLANE3_... defines. Although we supplied
missing EGL_LINUX_DMA_BUF_EXT defines manually, the PLANE3 ones are
actually from a separate extension, which explains why they were not
added to the fallback defines in the first place.
Add them, now it builds without the eglext.h include.
See #6838.
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At first, this code used only 1 plane, so the compatibility stuff was
sufficient. But then use of planes 1 and 2 was added, without extending
the compatibility stuff.
I think I've seen a case recently where this broke the build and caused
users to apply invalid fixes, but I don't remember where.
It's possible that I didn't get all defines that are needed.
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Like hwdec_cuda, you get a big #ifdef mess if you try and keep the
OpenGL and Vulkan interops in the same file. So, I've refactored
them into separate files in a similar way.
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