Hi,
I would like to be able to use the MESA_framebuffer_flip_y extension
in GLES 3.0. The blocker is that FramebufferParameteri is not part of
GLES 3.0. I have explored a couple of ways of achieving this.
1. FramebufferParameteri was first provided by the GL extension
ARB_framebuffer_no_attachments. However,
ARB_framebuffer_no_attachments was never a GLES extension. An option
would be to modify the ARB_framebuffer_no_attachments spec to make it
an extension for GLES.
2. Change the MESA_framebuffer_flip_y spec to allow the extension to
implement FramebufferParameteri.
I choose the 2nd option and put together a pr for it[1].
I didn't get the implementation quite right, and I'm looking for some
help. My change is failing the DispatchSanity_test.GLES3 test:
[ RUN ] DispatchSanity_test.GLES3
../src/mesa/main/tests/dispatch_sanity.cpp:174: Failure
Expected: nop_table[i]
Which is: 0x563d50d6fa01
To be equal to: table[i]
Which is: 0x563d50db158a
i = 888 (FramebufferParameteri)
../src/mesa/main/tests/dispatch_sanity.cpp:174: Failure
Expected: nop_table[i]
Which is: 0x563d50d6fa01
To be equal to: table[i]
Which is: 0x563d50db1add
i = 889 (GetFramebufferParameteriv)
[ FAILED ] DispatchSanity_test.GLES3 (1 ms)
It appears there is a problem with the way that I'm
defining/redefining FramebufferParameteri. I've tried adding it to
src/mapi/glapi/gen/es_EXT.xml, but the only way I was able to achieve
that was to give it a different function name and an alias.
Does anyone have experience with this sort of backporting of
extensions that could offer some insight on what I might be doing
wrong?
Thanks.
-Fritz
[1]: https://gitlab.freedesktop.org/mesa/mesa/merge_requests/1560
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