* Very basic SwiftShader support
- we only provide SwiftShader's khornos headers in third_party
- swiftshader itself must be available on the host (for instance it
can be compiled from source).
- to enable pass -DFILAMENT_USE_SWIFTSHADER=ON option to cmake
- only GLES 3.0 is supported. Vulkan is not yet supported.
CMake should find the swiftshader libraries automatically, but if
they're installed in a non-standard place, the environment variable
SWIFTSHADER_LD_LIBRARY_PATH can be set to that place.
We also use the GLES 3.0 headers everywhere, since we don't rely on 3.1
at this point.
* add a tnt folder with a README
d08a4e8bd9