glslangvalidator -V mesh.vert -o mesh.vert.spv
glslangvalidator -V mesh.frag -o mesh.frag.spv
glslangvalidator -V occluder.vert -o occluder.vert.spv
glslangvalidator -V occluder.frag -o occluder.frag.spv
glslangvalidator -V simple.vert -o simple.vert.spv
glslangvalidator -V simple.frag -o simple.frag.spv