Switching to stereo camera crashes

[Tom Goddard]

The following bug report has been submitted:
Platform:        Windows-10-10.0.17763
ChimeraX Version: 0.9 (2019-02-04)
Description
camera stereo

Log:
UCSF ChimeraX version: 0.9 (2019-02-04)  
© 2016-2019 Regents of the University of California. All rights reserved.  
How to cite UCSF ChimeraX  

> open 6bb5

6bb5 title:  
Human Oxy-Hemoglobin [more info...]  
  
Chain information for 6bb5 #1  
---  
Chain | Description  
A | Hemoglobin subunit α  
B | Hemoglobin subunit β  
  
Non-standard residues in 6bb5 #1  
---  
HEM — protoporphyrin IX containing Fe (HEME)  
OXY — oxygen molecule  
  
6bb5 mmCIF Assemblies  
---  
1| author_and_software_defined_assembly  
  
  

> camera stereo

An error occurred in drawing the scene. Redrawing graphics is now stopped to
avoid a continuous stream of error messages. To restart graphics use the
command "graphics restart" after changing the settings that caused the error.  
  
Traceback (most recent call last):  
File "C:\Program Files\ChimeraX-Feb-4-2019\bin\lib\site-
packages\chimerax\core\updateloop.py", line 72, in draw_new_frame  
view.draw(check_for_changes = False)  
File "C:\Program Files\ChimeraX-Feb-4-2019\bin\lib\site-
packages\chimerax\core\graphics\view.py", line 159, in draw  
self._draw_scene(camera, drawings)  
File "C:\Program Files\ChimeraX-Feb-4-2019\bin\lib\site-
packages\chimerax\core\graphics\view.py", line 218, in _draw_scene  
draw_opaque(r, opaque_drawings)  
File "C:\Program Files\ChimeraX-Feb-4-2019\bin\lib\site-
packages\chimerax\core\graphics\drawing.py", line 1367, in draw_opaque  
_draw_multiple(drawings, renderer, Drawing.OPAQUE_DRAW_PASS)  
File "C:\Program Files\ChimeraX-Feb-4-2019\bin\lib\site-
packages\chimerax\core\graphics\drawing.py", line 1378, in _draw_multiple  
d.draw(renderer, draw_pass)  
File "C:\Program Files\ChimeraX-Feb-4-2019\bin\lib\site-
packages\chimerax\core\graphics\drawing.py", line 688, in draw  
self.draw_self(renderer, draw_pass)  
File "C:\Program Files\ChimeraX-Feb-4-2019\bin\lib\site-
packages\chimerax\core\graphics\drawing.py", line 695, in draw_self  
self._draw_geometry(renderer, opaque_only = any_transp)  
File "C:\Program Files\ChimeraX-Feb-4-2019\bin\lib\site-
packages\chimerax\core\graphics\drawing.py", line 753, in _draw_geometry  
ds.draw(self.display_style)  
File "C:\Program Files\ChimeraX-Feb-4-2019\bin\lib\site-
packages\chimerax\core\graphics\drawing.py", line 1548, in draw  
eb.draw_elements(etype, ni)  
File "C:\Program Files\ChimeraX-Feb-4-2019\bin\lib\site-
packages\chimerax\core\graphics\opengl.py", line 2266, in draw_elements  
GL.glDrawElementsInstanced(element_type, ne, GL.GL_UNSIGNED_INT, eo, ninst)  
File "src\latebind.pyx", line 32, in
OpenGL_accelerate.latebind.LateBind.__call__  
File "src\wrapper.pyx", line 311, in
OpenGL_accelerate.wrapper.Wrapper.__call__  
OSError: exception: access violation reading 0x0000000000000000  
  




OpenGL version: 3.3.0 NVIDIA 391.58
OpenGL renderer: Quadro P6000/PCIe/SSE2
OpenGL vendor: NVIDIA Corporation

[Tom Goddard]

Tests show July 23, 2018 and later versions give same error on camera stereo. July 17, 2018 version gives no error but does not show molecule. June 27, 2018 works correctly.

[Tom Goddard]

Switching to stereo camera works before any model is opened. So probably the error is related to sharing OpenGL state between the mono context and stereo context and rebuilding framebuffers and vertex array objects., ....

[Tom Goddard]

Fixed.

When OpenGL context was switched to stereo, VAO (vertex array object) binding of element buffer was not restored. This bug was introduced 6 months ago in July 2018. Apparently no one is trying to use stereo.