| 1 | Off-screen Rendering
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| 2 | ====================
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| 3 |
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| 4 | Mesa's off-screen interface is used for rendering into user-allocated
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| 5 | memory without any sort of window system or operating system
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| 6 | dependencies. That is, the GL_FRONT colorbuffer is actually a buffer in
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| 7 | main memory, rather than a window on your display.
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| 8 |
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| 9 | The OSMesa API provides three basic functions for making off-screen
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| 10 | renderings: OSMesaCreateContext(), OSMesaMakeCurrent(), and
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| 11 | OSMesaDestroyContext(). See the Mesa/include/GL/osmesa.h header for more
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| 12 | information about the API functions.
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| 13 |
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| 14 | The OSMesa interface may be used with the gallium software renderers:
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| 15 |
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| 16 | #. LLVMpipe - this is the high-performance Gallium LLVM driver
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| 17 | #. Softpipe - this is the reference Gallium software driver
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| 18 |
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| 19 | There are several examples of OSMesa in the mesa/demos repository.
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| 20 |
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| 21 | Building OSMesa
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| 22 | ---------------
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| 23 |
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| 24 | Configure and build Mesa with something like:
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| 25 |
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| 26 | .. code-block:: console
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| 27 |
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| 28 | meson setup builddir -Dosmesa=true -Dgallium-drivers=swrast -Dvulkan-drivers=[] -Dprefix=$PWD/builddir/install
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| 29 | meson install -C builddir
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| 30 |
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| 31 | Make sure you have LLVM installed first if you want to use the LLVMpipe
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| 32 | driver.
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| 33 |
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| 34 | When the build is complete you should find:
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| 35 |
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| 36 | ::
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| 37 |
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| 38 | $PWD/builddir/install/lib/libOSMesa.so
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| 39 |
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| 40 | Set your LD_LIBRARY_PATH to point to $PWD/builddir/install to use the
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| 41 | libraries
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| 42 |
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| 43 | When you link your application, link with -lOSMesa
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