#include "kernel_PinholePrincipalPoint_normalize.h"
#include "memops.cuh"
#include <cooperative_groups.h>
#include <cooperative_groups/details/partitioning.h>
#include <cooperative_groups/memcpy_async.h>
#include <cooperative_groups/reduce.h>
#include <cuda_runtime.h>

namespace cg = cooperative_groups;

namespace caspar {

__global__ void __launch_bounds__(1024, 1)
    PinholePrincipalPointNormalizeKernel(float* precond_diag,
                                         unsigned int precond_diag_num_alloc,
                                         float* precond_tril,
                                         unsigned int precond_tril_num_alloc,
                                         float* njtr,
                                         unsigned int njtr_num_alloc,
                                         const float* const diag,
                                         float* out_normalized,
                                         unsigned int out_normalized_num_alloc,
                                         size_t problem_size) {
  const int global_thread_idx = blockIdx.x * blockDim.x + threadIdx.x;
  __shared__ uint8_t inout_shared[4096];

  float r0, r1, r2, r3, r4, r5, r6;

  if (global_thread_idx < problem_size) {
    ReadIdx2<1024, float, float, float2>(
        njtr, 0 * njtr_num_alloc, global_thread_idx, r0, r1);
    ReadIdx2<1024, float, float, float2>(
        precond_diag, 0 * precond_diag_num_alloc, global_thread_idx, r2, r3);
  };
  LoadUnique<1, float, float>(diag, 0, (float*)inout_shared);
  if (global_thread_idx < problem_size) {
    ReadShared1<float>((float*)inout_shared, 0, r4);
  };
  __syncthreads();
  if (global_thread_idx < problem_size) {
    r5 = 1.00000000000000000e+00;
    r5 = r4 + r5;
    r6 = 9.99999999999999955e-07;
    r6 = r4 * r6;
    r2 = fmaf(r2, r5, r6);
    r2 = 1.0 / r2;
    r2 = r0 * r2;
    r5 = fmaf(r3, r5, r6);
    r5 = 1.0 / r5;
    r5 = r1 * r5;
    WriteIdx2<1024, float, float, float2>(out_normalized,
                                          0 * out_normalized_num_alloc,
                                          global_thread_idx,
                                          r2,
                                          r5);
  };
}

void PinholePrincipalPointNormalize(float* precond_diag,
                                    unsigned int precond_diag_num_alloc,
                                    float* precond_tril,
                                    unsigned int precond_tril_num_alloc,
                                    float* njtr,
                                    unsigned int njtr_num_alloc,
                                    const float* const diag,
                                    float* out_normalized,
                                    unsigned int out_normalized_num_alloc,
                                    size_t problem_size) {
  if (problem_size == 0) {
    return;
  }

  const int n_blocks = (problem_size + 1024 - 1) / 1024;
  PinholePrincipalPointNormalizeKernel<<<n_blocks, 1024>>>(
      precond_diag,
      precond_diag_num_alloc,
      precond_tril,
      precond_tril_num_alloc,
      njtr,
      njtr_num_alloc,
      diag,
      out_normalized,
      out_normalized_num_alloc,
      problem_size);
}

}  // namespace caspar