[Octave-bug-tracker] [bug #49083] demo camlight fails using qt graphics_toolkit

[Markus Mützel]

Follow-up Comment #9, bug #49083 (project octave):

The attached patch fixes the original issue from comment #0 for me by checking
the gl error after GL_MULTISAMPLE and reacting accordingly in gl-render.cc.

>From [1]: GL_MULTISAMPLE is available in OpenGL 1.3 and later. GL_INVALID_ENUM
is generated by glEnable "if cap is not one of the values listed previously".
That might include the case when calling a feature on a version that doesn't
support it.
I guess from its documentation [2] that glIsEnabled would generate the same
error.

In Octave on Windows, "__opengl_info__" returns the following for me:

version    = 1.1.0
vendor     = Microsoft Corporation
renderer   = GDI Generic
extensions =
  GL_WIN_swap_hint
  GL_EXT_bgra
  GL_EXT_paletted_texture


Is that the GL_VERSION or the version of the graphics driver?

[1]: https://www.opengl.org/sdk/docs/man2/xhtml/glEnable.xml
[2]: https://www.opengl.org/sdk/docs/man2/xhtml/glIsEnabled.xml

(file #38514)
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Additional Item Attachment:

File name: bug45542_GL_MULTISAMPLE.patch  Size:2 KB


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