import os
from pathlib import Path

from torch.utils.cpp_extension import load


gcc_path = os.getenv('CC', default='/usr/bin/gcc')
if not Path(gcc_path).is_file():
    raise ValueError('Could not find your gcc, please replace it here.')

_src_path = os.path.dirname(os.path.abspath(__file__))
_backend = load(
    name='_pvcnn_backend',
    extra_cflags=['-O3', '-std=c++17'],
    extra_cuda_cflags=[f'--compiler-bindir={gcc_path}'],
    sources=[os.path.join(_src_path,'src', f) for f in [
        'ball_query/ball_query.cpp',
        'ball_query/ball_query.cu',
        'grouping/grouping.cpp',
        'grouping/grouping.cu',
        'interpolate/neighbor_interpolate.cpp',
        'interpolate/neighbor_interpolate.cu',
        'interpolate/trilinear_devox.cpp',
        'interpolate/trilinear_devox.cu',
        'sampling/sampling.cpp',
        'sampling/sampling.cu',
        'voxelization/vox.cpp',
        'voxelization/vox.cu',
        'bindings.cpp',
    ]]
)

__all__ = ['_backend']