Refacto CUDA files

[simon-riou]

Structure might not always be the best Useless includes Dead code Unused function Bad comments ...

[simon-riou]

https://developer.nvidia.com/blog/cuda-pro-tip-optimize-pointer-aliasing/

[simon-riou]

Todo list of CUDA files

• [x] apply_mask.cu
• [ ] composite.cu
• [ ] convolution.cu
• [x] angular_spectrum.cu
• [ ] frame_reshape.cu
• [ ] input_filter.cu
• [ ] percentile.cu
• [ ] rgb.cu
• [ ] stft.c
• [ ] texture_update.cu
• [ ] tools_compute.cu
• [ ] tools_hsv.cu
• [ ] transforms.cu
• [x] chart.cu
• [ ] contrast_correction.cu
• [ ] fresnel_transform.cu
• [ ] filter2D.cu
• [ ] hsv.cu
• [ ] map.cu
• [ ] reduce.cu
• [ ] shift_corners.cu
• [ ] test_reduce.cu (What is the purpose of this file ?)
• [ ] tools.cu
• [ ] tools_conversion.cu
• [ ] tools_unwrap.cu
• [ ] unpack.cu
• [ ] cuda_memory

[Hpn4]

You can delete:

• frame_reshape.cc and frame_reshape.hh
• in reduce functions: reduce_min, reduce_max, gpu_reduce and delete duplicate functions that are in reduce.cc and in reduce.cuhxx (you can basically delete reduce.cc)
• in map functions: map_divide
• in shift_corners functions that have 6 paramètres (only the 5 parameters one are called)

[simon-riou]

https://developer.nvidia.com/blog/using-cuda-warp-level-primitives/

I use it in kernel_apply_mapped_zone_sum in chart.cu to avoid too many calls of atomic op