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| OSMesa is used since Octave 4.0 for offscreen rendering from OpenGL toolkits FLTK and Qt.
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| This enables printing without a X display, for example when ssh'ing to a remote machine, or if the figure is invisible ({{bug|33180}}).
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| = libOSMesa = | | = libOSMesa = |
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| Needed for example for Debian wheezy or Ubuntu 12.04.5 which ships OSMesa 8.0.5. | | Needed for example for Debian wheezy or Ubuntu 12.04.5 which ships OSMesa 8.0.5. |
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| wget -nc ftp://ftp.freedesktop.org/pub/mesa/current/mesa-10.5.4.tar.xz | | wget -nc ftp://ftp.freedesktop.org/pub/mesa/current/MesaLib-10.2.2.tar.bz2 |
| tar Jxf mesa-10.5.4.tar.xz | | tar xjf MesaLib-10.2.2.tar.bz2 |
| cd mesa-10.5.4/ | | cd Mesa-10.2.2/ |
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| autoreconf -fi | | autoreconf -fi |
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| Floating point textures are disabled by default due to patent restrictions. We should check if we can enable it with "--enable-texture-float" | | Floating point textures are disabled by default due to patent restrictions. We should check if we can enable it with "--enable-texture-float" |
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| == known problems ==
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| Unfortunately, there are several known problems with using on-screen Mesa and OSMesa at the same time.
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| The --without-OSMesa configure can be used to disable OSMesa if a problem is encountered.
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| * {{bug|44478}} segmentation fault when using proprietary Nvidia drivers
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| * {{bug|44979}} clumsy/missing configure check, relies on runtime failure
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| * {{bug|44338}} doesn't work at all on Windows
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| * [https://bugs.launchpad.net/bugs/1424059 LP #1424059] libosmesa6 is not installable on Ubuntu 14.04 with HWE updates
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| * {{bug|50479}} doesn't work at all with libglvnd, now standard in most distributions
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| === workarounds ===
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| * Preload the Mesa libGL.so, for example
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| export LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libGL.so
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| == Reporting Bugs ==
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| * Please include the output of
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| glxinfo | grep "^OpenGL \(renderer\|core profile version\|vendor\)"
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