[Bug 110318] Disabling ARB_fragment_shader causes implementation errors

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110318

            Bug ID: 110318
           Summary: Disabling ARB_fragment_shader causes implementation
                    errors
           Product: Mesa
           Version: 19.0
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i915
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: astrosnail at protonmail.com
        QA Contact: dri-devel at lists.freedesktop.org

Created attachment 143856
  --> https://bugs.freedesktop.org/attachment.cgi?id=143856&action=edit
Full glxinfo output

When I disable ARB_fragment_shader support, various applications error with
"Mesa 19.0.1 implementation error: Incomplete OpenGL ES 2.0 support."
Deleting ~/.drirc recovers from the error.

Steps to reproduce:
1) Run driconf
2) Uncheck "Enable limited ARB_fragment_shader support on 915/945."

Actual results:
  driconf will error.
  glxinfo will segfault when it reaches OpenGL ES info, with a null version
string.
  mpv with --opengl-es=yes will error with a null version string.
  Many others probably apply.
All of them print the following:
Mesa 19.0.1 implementation error: Incomplete OpenGL ES 2.0 support.
Please report at https://bugs.freedesktop.org/enter_bug.cgi?product=Mesa

Expected results:
The applications shouldn't be allowed to use OpenGL ES 2.0, given the disabled
fragment shader support.

Versions etc:
Arch Linux x86_64
  mesa 19.0.1-2
  driconf 0.9.1-14
  mesa-demos 8.4.0-1

Small amounts of text:
$ driconf
Mesa 19.0.1 implementation error: Incomplete OpenGL ES 2.0 support.
Please report at https://bugs.freedesktop.org/enter_bug.cgi?product=Mesa
Traceback (most recent call last):
  File "/usr/bin/driconf", line 28, in <module>
    driconf.main()
  File "/usr/lib/driconf/driconf.py", line 52, in main
    commonui.dpy = dri.DisplayInfo ()
  File "/usr/lib/driconf/dri.py", line 396, in __init__
    self.getScreen (i)
  File "/usr/lib/driconf/dri.py", line 411, in getScreen
    screen = ScreenInfo (i, self.dpy)
  File "/usr/lib/driconf/dri.py", line 380, in __init__
    self.glxInfo = GLXInfo (screen, dpy)
  File "/usr/lib/driconf/dri.py", line 349, in __init__
    raise DRIError ("glxinfo killed by signal " + signal + ".")
TypeError: cannot concatenate 'str' and 'int' objects

$ glxinfo
(***see attached for full output***)
    GL_SGIS_texture_edge_clamp, GL_SGIS_texture_lod, GL_SUN_multi_draw_arrays
Mesa 19.0.1 implementation error: Incomplete OpenGL ES 2.0 support.
Please report at https://bugs.freedesktop.org/enter_bug.cgi?product=Mesa

OpenGL ES profile version string: (null)
Segmentation fault (core dumped)

$ mpv --vo=gpu --gpu-api=opengl --opengl-es=yes /the/file/doesnt/matter.mkv
Playing: /the/file/doesnt/matter.mkv
 (+) Video --vid=1 (*) (h264 1920x1080 60.000fps)
 (+) Audio --aid=1 --alang=eng (*) (opus 2ch 48000Hz)
[vo/gpu/opengl] At least OpenGL 2.1 or OpenGL ES 2.0 required.
Mesa 19.0.1 implementation error: Incomplete OpenGL ES 2.0 support.
Please report at https://bugs.freedesktop.org/enter_bug.cgi?product=Mesa
[vo/gpu/opengl] glGetString(GL_VERSION) returned NULL.
[vo/gpu/opengl] At least OpenGL 2.1 or OpenGL ES 2.0 required.
[vo/gpu] Failed initializing any suitable GPU context!
Error opening/initializing the selected video_out (--vo) device.
Video: no video


Exiting... (Errors when loading file)

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