[GLMakie] only every 64th line segment is rendered on AMD integrated graphics

[imyxh]

Hello, I just noticed something wrong with my lines plots today. When I run the following simple test code in the REPL:

using GLMakie
fig = Figure()
ax = fig[1, 1] = Axis(fig)
xs = 0:0.01:5
lines!(xs, map(sin, xs))

This is the kind of output I get:

The lines drawn seem to only connect two points at a time, and only do so very very intermittently. I have noticed no problems with scatter or even linesegments, just lines.

Does anyone have any suggestions to debug this further? Help would be greatly appreciated. Thanks!

Edit: Julia 1.6.3, GLMakie 0.4.7, Wayland on Linux. CairoMakie does not have the same issue.

[ximonsson]

i am experiencing the same issue running the same setup but using x server instead of wayland on arch linux. also tried with julia 1.6.4 today and the issue persists.

i thought it might be a driver issue and have tried it on three different machines. the only one that it does not work on is the laptop with integrated amd graphics. other opengl applications like glxgears works fine though. funny is that i can see a very short flash of the lines and then they disapear.

maybe someone with similar hardware can confirm if it might be an isolated issue. output of lspci -v | grep -i vga:

03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Renoir (rev d1) (prog-if 00 [VGA controller])

i get the following failed tests when i run ] test GLMakie

Test Summary:                                               | Pass  Fail  Total
Reference Image Tests                                       |   50    17     67
  examples2d_27_Arrowsonhemisphere.png                      |          1      1
  short_tests_36.png                                        |          1      1
  short_tests_51.png                                        |    1            1
  examples2d_104_coloredtrianglewithpoly.png                |    1            1
  text_216_Textoffset.png                                   |    1            1
  short_tests_154_log10heatmap.png                          |    1            1
  attributes_16_font.png                                    |    1            1
  text_202_3Dscreenspaceannotations.png                     |          1      1
  short_tests_22.png                                        |    1            1
  attributes_26_isorange,isovalue.png                       |          1      1
  text_173_text_in_3d_axis.png                              |    1            1
  text_252_latexstrings.png                                 |    1            1
  short_tests_19.png                                        |    1            1
  attributes_50_shading.png                                 |    1            1
  attributes_3_align.png                                    |    1            1
  examples3d_6_ImageonGeometry(Moon).png                    |    1            1
  short_tests_119_heatmaps&surface.png                      |    1            1
  text_266_latexsimple.png                                  |    1            1
  short_tests_67.png                                        |    1            1
  text_80_single_strings_single_positions_justification.png |    1            1
  short_tests_23.png                                        |    1            1
  text_141_single_boundingboxes.png                         |    1            1
  short_tests_25.png                                        |    1            1
  short_tests_1.png                                         |          1      1
  examples2d_43_FEMpolygon2D.png                            |    1            1
  short_tests_33.png                                        |    1            1
  short_tests_35.png                                        |          1      1
  attributes_32_levels.png                                  |          1      1
  short_tests_21.png                                        |    1            1
  text_185_empty_lines.png                                  |    1            1
  short_tests_7.png                                         |    1            1
  examples2d_22_quiver.png                                  |    1            1
  text_19_dataspace.png                                     |    1            1
  short_tests_158_reverserangeheatmap.png                   |    1            1
  short_tests_40.png                                        |          1      1
  short_tests_70.png                                        |          1      1
  short_tests_13.png                                        |    1            1
  text_55_multi_strings_multi_positions.png                 |    1            1
  short_tests_42.png                                        |          1      1
  examples2d_11_polyandcolormap.png                         |    1            1
  short_tests_59.png                                        |    1            1
  short_tests_39.png                                        |          1      1
  short_tests_43.png                                        |    1            1
  short_tests_80_Unequalxandysizesinsurface.png             |          1      1
  short_tests_100_Matricesofdatainsurfaces.png              |          1      1
  text_113_multi_boundingboxes.png                          |    1            1
  short_tests_68.png                                        |    1            1
  examples2d_69_FEMmesh2D.png                               |    1            1
  short_tests_37.png                                        |          1      1
  examples2d_97_coloredtriangle.png                         |    1            1
  text_32_single_strings_single_positions.png               |    1            1
  attributes_9_fillrange.png                                |    1            1
  text_3_heatmap_with_labels.png                            |    1            1
  short_tests_49.png                                        |    1            1
  attributes_40_position.png                                |    1            1
  attributes_54_visible.png                                 |    1            1
  attributes_46_rotation.png                                |    1            1
  examples2d_36_image.png                                   |          1      1
  short_tests_5.png                                         |          1      1
  short_tests_20.png                                        |    1            1
  short_tests_3.png                                         |    1            1
  text_244_Log10text.png                                    |    1            1
  attributes_22_glowcolor,glowwidth.png                     |    1            1
  examples2d_5_Testheatmap+imageoverlap.png                 |    1            1
  short_tests_56.png                                        |    1            1
  short_tests_57.png                                        |    1            1
  short_tests_41.png                                        |          1      1
ERROR: LoadError: Some tests did not pass: 50 passed, 17 failed, 0 errored, 0 broken.
in expression starting at /home/ximon/.julia/packages/GLMakie/pFGSp/test/runtests.jl:21
ERROR: Package GLMakie errored during testing

[SimonDanisch]

Ah, wow...this seems to be again a driver issue:

Jeez, how can the drivers be so different...

[ffreyer]

Is this also an issue with the previous version?

[ximonsson]

tried v0.4.6, v0.4.5 and v0.3.4 and they all had the same issue. guess the drivers are to blame here.

[imyxh]

i thought it might be a driver issue and have tried it on three different machines. the only one that it does not work on is the laptop with integrated amd graphics. other opengl applications like glxgears works fine though. funny is that i can see a very short flash of the lines and then they disapear.

Aha! I am using the integrated graphics on an AMD Ryzen 5 2400G. And yes, I also noticed the flash.

[mo8it]

Makie v0.16.1
GLMakie v0.5.0

This version just came out two days ago and the issue is still not solved #1543.

I also use AMD integrated graphics.

Blaming the driver sounds too easy since I guess we here have different kernel versions. Any idea how to help to debug it?

My linux kernel version is 5.15.12

[SimonDanisch]

Blaming the driver sounds too easy since

Well, it only happens on AMD, so it must be a driver issue one way or the other...
It doesn't mean, that we can't fix it by writing the shader in a different way, but it does mean it will be hard to figure out, especially if I don't have access to the hardware.

[imyxh]

I guess my question is, how is lines using the driver that linesegments isn't? And are there other plot commands that we should test that are similar to lines?

Also, what driver do you suspect is at fault here? OpenGL? OpenCL? Vulkan? Sorry, not very familiar with the GLMakie codebase, but I would be happy for that to change!

[mo8it]

I am sorry, I am not trying to blame you @SimonDanisch . I would just like to help. Hardware access is difficult. I could run tests and provide you with the results if you want.

Should we open an issue for the kernel? The other two users are also on Linux, so it might be an issue with the Linux driver specifically.

[mo8it]

I guess my question is, how is lines using the driver that linesegments isn't? And are there other plot commands that we should test that are similar to lines?

Strokes from poly are also affected as shown in this issue #1543.

I can confirm that linesegments does work on my machine.

[mo8it]

lines([1, 2], [1, 2]) does also work fine. But lines([1, 2, 3], [1, 2, 3]) does only show the segment from (1, 1) to (2, 2).
The question is, what happens after the first segment in lines that breaks things?

linesegments([1, 2, 2, 3], [1, 2, 2, 3]) shows exactly the expected result of lines([1, 2, 3], [1, 2, 3]) without any problem.

[imyxh]

It's not just the first line segment that displays, as you can see in my original image. It seems to maybe be every 64th line segment? Or something close to that? (away from my computer)

[mo8it]

@imyxh you are right!

Example:

x = 1:200
lines(x, x)

This code shows only segments starting with the points (1, 1), (65, 65), (129, 129) etc.