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Off-screen Rendering
''''''''''''''''''''
Mesa's off-screen interface is used for rendering into user-allocated
memory without any sort of window system or operating system
dependencies. That is, the GL\_FRONT colorbuffer is actually a buffer in
main memory, rather than a window on your display.
The OSMesa API provides three basic functions for making off-screen
renderings: OSMesaCreateContext(), OSMesaMakeCurrent(), and
OSMesaDestroyContext(). See the Mesa/include/GL/osmesa.h header for more
information about the API functions.
The OSMesa interface may be used with any of three software renderers:
#. llvmpipe - this is the high-performance Gallium LLVM driver
#. softpipe - this it the reference Gallium software driver
#. swrast - this is the legacy Mesa software rasterizer
There are several examples of OSMesa in the mesa/demos repository.
Building OSMesa
===============
Configure and build Mesa with something like:
::
configure --enable-osmesa --disable-driglx-direct --disable-dri --with-gallium-drivers=swrast
make
Make sure you have LLVM installed first if you want to use the llvmpipe
driver.
When the build is complete you should find:
::
lib/libOSMesa.so (swrast-based OSMesa)
lib/gallium/libOSMsea.so (gallium-based OSMesa)
Set your LD\_LIBRARY\_PATH to point to one directory or the other to
select the library you want to use.
When you link your application, link with -lOSMesa
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