osmesa-install

Script and patches to build and install variations of OSMesa http://www.mesa3d.org/osmesa.html:

• "mangled" or not (in mangled OSMesa, all functions start with mgl instead of gl)
• debug or not
• choice of osmesa driver: swrast, softpipe, llvmpipe or swr (SWR is not yet supported on macOS)
• possibility to also compile and install LLVM 4.0.0 or 3.4.2 for the llvmpipe driver

Usage

• edit variables / paths as the beginning of the osmesa-install.sh script
• compile and install:

mkdir build
cd build
sh ../osmesa-install.sh

• there is a test program on the osdemo directory, with a few checks

Notes and caveats

The script fixes the following Mesa bugs related to mangled OSMesa:

• GL/gl_mangle.h misses symbols from GLES/gl.h

Also note that the latest clang (tested with 4.0.0) does not build on 32 bits mingw64 due to the following gcc bug (older versions of clang work):

• http://lists.llvm.org/pipermail/cfe-dev/2016-December/052017.html
• https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78936