Fix case of include files
FileCheck is not installed by default, switch back to checkresult script
Make tile size a global constant instead of a parameter for efficiency.
Perform bounding box check before backface culling, which is about 7% faster.
Merge branch 'master' of github.com:jbush001/GPGPU into rasterizer
Merge branch 'rasterizer' of github.com:philipdexter/GPGPU into rasterizer