test fails at `eglExportDMABUFImageQueryMESA`

I am using NVIDIA driver 525.89.02.

[0.545][e] eglExportDMABUFImageQueryMESA: EGL error: EGL_BAD_MATCH
[0.545][e] Failed exporting GL texture!
=== FAILED: 'export' at src/tests/gpu_tests.h:1579
14/14 opengl_surfaceless.c FAIL            1.48s   exit status 1

changed title from test fail at eglExportDMABUFImageQueryMESA to test fails at eglExportDMABUFImageQueryMESA

changed milestone to %v5.252+

added bug good first issue help wanted opengl labels

From this thread:

Just one thing I did think of, you need to have the modeset module parameter set to 1 for the DMA-BUF stuff to work.

removed milestone %v5.252+

I have already added nvidia-drm.modeset=1 to kernel cmdline.

Then I don't know what else to try. Without some sort of error message or clarification from nvidia, I have no idea what parameter is wrong, where, and why, or what to do to fix it. It works fine on actual mesa. (Y'know, being a mesa extension and all...)

Maybe we can just blacklist support for this extension from the nvidia driver, but I'm not happy blacklisting things from drivers because it prevents them from being reasonably able to fix it in the future.

Now it gives the following error:

=== FAILED: 'peak ≈ real_peak' at ../libplacebo/src/tests/gpu_tests.h:671
peak                            = 0.865011
real_peak                       = 0.838178
epsilon 1e-3 -> max delta       = 0.001000

I can reproduce this error on my nvidia GPU, but not my AMD GPU. I will try and figure out what's going on.

So, after extensive testing, I've come to the conclusion that the original issue here is an nvidia driver bug. The triggering circumstances seem to be the combination of surfaceless platform and the r8 texture format. Using rgba8 instead of r8 works fine, and using an x11 window instead of a surfaceless pbuffer also works fine.

I managed to create a small independent reproducer, which I may polish and upload to nvidia if I can be bothered. But for now, worked around it by just testing with rgba8 instead of r8.

mentioned in commit haasn/libplacebo@22ceec15

mentioned in commit haasn/libplacebo@c9697154

closed with commit 22ceec15

closed with commit c9697154

mentioned in commit abf7f6f9

mentioned in commit d54e175b