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On 4/30/24 03:45 Gonzalo Garramuño wrote:
According
to CMake's find_package(OpenGL), setting this should allow for a
vendor neutral distribution of Wayland and EGL:
set(OpenGL_GL_PREFERENCE GLVND)
This should be the default (since CMake 3.10 or so), and we don't
override this. You *can* specify it but you shouldn't need this
because we require CMake 3.15 and that enables the according CMake
policy.
find_package(OpenGL
REQUIRED)
This seems to be the main issue. We don't use this directly (yet),
our current code uses findLibrary() and is ... suboptimal.
I'll check this when time permits.
list(APPEND
LIBRARIES OpenGL::OpenGL OpenGL::EGL)
target_link_libraries(mrv2 PUBLIC ${LIBRARIES} )
Same issue as above, we're not (yet) using the OpenGL targets in
FLTK's CMake files. Our code predates the addition of GLVND support
in CMake.
But it does not seem to work for me. My application with FLTK and
GLFW both latest (compiled on Rocky Linux 8.9 and running on
Ubuntu 22.04.4 LTS) starts fine but always loads Mesa's libEGL.
Let's see what I can do to change this although I don't have any
NVIDIA stuff installed because I don't use NVIDIA graphics.
However, it looks like I got 'GLVND' support on my system. From `apt
list`:
libglvnd-core-dev/stable,now 1.6.0-1 amd64
[installed,automatic]
libglvnd-dev/stable,now 1.6.0-1 amd64 [installed,automatic]
libglvnd0/stable,now 1.6.0-1 amd64 [installed,automatic]
libglvnd0/stable,now 1.6.0-1 i386 [installed,automatic]
Whatever that means.
Google's Gemini told me about these variables:
The system searches for directories or files specified by
environment variables:
__EGL_VENDOR_LIBRARY_FILENAMES: This variable takes a
colon-separated list of JSON files describing available ICDs.
__EGL_VENDOR_LIBRARY_DIRS: This variable takes a colon-separated
list of directories containing JSON files for ICDs.
Great explanation for someone who doesn't know what ICD means is
this context! :-(
Looks like "Installable Client Driver (OpenGL)" is meant here,
rather than "Implantable Cardioverter Defibrillator" ;-)
I set them to:
> echo $__EGL_VENDOR_LIBRARY_DIRS
/usr/share/glvnd/
> echo $__EGL_VENDOR_LIBRARY_FILENAMES
10_nvidia.json:50_mesa.json
Does the file '10_nvidia.json' exist at the appropriate place?
My /usr/share/glvnd/ tree looks like:
$ tree /usr/share/glvnd/
/usr/share/glvnd/
└── egl_vendor.d
└── 50_mesa.json
There's no 10_nvidia.json file for obvious reasons... (see above).
And then my application does not start and gives me the weird
error:
GLFW ERROR: EGL: Failed to get EGL display: Success
ERROR: Cannot create window
OK, that's really weird, an ERROR because of "Success".
The reason I want load NVidia's EGL instead of Mesa's EGL is one
of performance. Mesa's EGL plays 4K movies at 16 FPS while
NVidia's EGL plays them at a perfect 60 FPS.
Manolo and Albrecht, can you help?
I'm not sure, I have no idea what this OpenGL and GLVND stuff is all
about. Meanwhile I know a little more, but the (CMake) docs are
more for users who KNOW what GLVND is and not for such users like
me. ;-)
Anyway, I believe I can improve at least the usage of findOpenGL and
thus hopefully enable the GLVND mode and maybe that solves your
issues.
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