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// Copyright (c) Meta Platforms, Inc. and affiliates.
// All rights reserved.
//
// This source code is licensed under the license found in the
// LICENSE file in the root directory of this source tree.
#include <torch/extension.h>
#include <c10/cuda/CUDAStream.h>
#include <vector>
void compute_raydirs_forward_cuda(
int N, int H, int W,
float * viewposim,
float * viewrotim,
float * focalim,
float * princptim,
float * pixelcoordsim,
float volradius,
float * raypos,
float * raydir,
float * tminmax,
cudaStream_t stream);
void compute_raydirs_backward_cuda(
int N, int H, int W,
float * viewposim,
float * viewrotim,
float * focalim,
float * princptim,
float * pixelcoordsim,
float volradius,
float * raypos,
float * raydir,
float * tminmax,
float * grad_viewposim,
float * grad_viewrotim,
float * grad_focalim,
float * grad_princptim,
cudaStream_t stream);
#define CHECK_CUDA(x) AT_ASSERTM(x.is_cuda(), #x " must be a CUDA tensor")
#define CHECK_CONTIGUOUS(x) AT_ASSERTM(x.is_contiguous(), #x " must be contiguous")
#define CHECK_INPUT(x) CHECK_CUDA((x)); CHECK_CONTIGUOUS((x))
std::vector<torch::Tensor> compute_raydirs_forward(
torch::Tensor viewposim,
torch::Tensor viewrotim,
torch::Tensor focalim,
torch::Tensor princptim,
torch::optional<torch::Tensor> pixelcoordsim,
int W, int H,
float volradius,
torch::Tensor rayposim,
torch::Tensor raydirim,
torch::Tensor tminmaxim) {
CHECK_INPUT(viewposim);
CHECK_INPUT(viewrotim);
CHECK_INPUT(focalim);
CHECK_INPUT(princptim);
if (pixelcoordsim) { CHECK_INPUT(*pixelcoordsim); }
CHECK_INPUT(rayposim);
CHECK_INPUT(raydirim);
CHECK_INPUT(tminmaxim);
int N = viewposim.size(0);
assert(!pixelcoordsim || (pixelcoordsim.size(1) == H && pixelcoordsim.size(2) == W));
compute_raydirs_forward_cuda(N, H, W,
reinterpret_cast<float *>(viewposim.data_ptr()),
reinterpret_cast<float *>(viewrotim.data_ptr()),
reinterpret_cast<float *>(focalim.data_ptr()),
reinterpret_cast<float *>(princptim.data_ptr()),
pixelcoordsim ? reinterpret_cast<float *>(pixelcoordsim->data_ptr()) : nullptr,
volradius,
reinterpret_cast<float *>(rayposim.data_ptr()),
reinterpret_cast<float *>(raydirim.data_ptr()),
reinterpret_cast<float *>(tminmaxim.data_ptr()),
0);
return {};
}
std::vector<torch::Tensor> compute_raydirs_backward(
torch::Tensor viewposim,
torch::Tensor viewrotim,
torch::Tensor focalim,
torch::Tensor princptim,
torch::optional<torch::Tensor> pixelcoordsim,
int W, int H,
float volradius,
torch::Tensor rayposim,
torch::Tensor raydirim,
torch::Tensor tminmaxim,
torch::Tensor grad_viewpos,
torch::Tensor grad_viewrot,
torch::Tensor grad_focal,
torch::Tensor grad_princpt) {
CHECK_INPUT(viewposim);
CHECK_INPUT(viewrotim);
CHECK_INPUT(focalim);
CHECK_INPUT(princptim);
if (pixelcoordsim) { CHECK_INPUT(*pixelcoordsim); }
CHECK_INPUT(rayposim);
CHECK_INPUT(raydirim);
CHECK_INPUT(tminmaxim);
CHECK_INPUT(grad_viewpos);
CHECK_INPUT(grad_viewrot);
CHECK_INPUT(grad_focal);
CHECK_INPUT(grad_princpt);
int N = viewposim.size(0);
assert(!pixelcoordsim || (pixelcoordsim.size(1) == H && pixelcoordsim.size(2) == W));
compute_raydirs_backward_cuda(N, H, W,
reinterpret_cast<float *>(viewposim.data_ptr()),
reinterpret_cast<float *>(viewrotim.data_ptr()),
reinterpret_cast<float *>(focalim.data_ptr()),
reinterpret_cast<float *>(princptim.data_ptr()),
pixelcoordsim ? reinterpret_cast<float *>(pixelcoordsim->data_ptr()) : nullptr,
volradius,
reinterpret_cast<float *>(rayposim.data_ptr()),
reinterpret_cast<float *>(raydirim.data_ptr()),
reinterpret_cast<float *>(tminmaxim.data_ptr()),
reinterpret_cast<float *>(grad_viewpos.data_ptr()),
reinterpret_cast<float *>(grad_viewrot.data_ptr()),
reinterpret_cast<float *>(grad_focal.data_ptr()),
reinterpret_cast<float *>(grad_princpt.data_ptr()),
0);
return {};
}
PYBIND11_MODULE(TORCH_EXTENSION_NAME, m) {
m.def("compute_raydirs_forward", &compute_raydirs_forward, "raydirs forward (CUDA)");
m.def("compute_raydirs_backward", &compute_raydirs_backward, "raydirs backward (CUDA)");
}
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