#include "kernel_PinholeFocal_update_step.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) PinholeFocalUpdateStepKernel(
    float* PinholeFocal_step_k,
    unsigned int PinholeFocal_step_k_num_alloc,
    float* PinholeFocal_p_kp1,
    unsigned int PinholeFocal_p_kp1_num_alloc,
    const float* const alpha,
    float* out_PinholeFocal_step_kp1,
    unsigned int out_PinholeFocal_step_kp1_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;

  if (global_thread_idx < problem_size) {
    ReadIdx2<1024, float, float, float2>(PinholeFocal_step_k,
                                         0 * PinholeFocal_step_k_num_alloc,
                                         global_thread_idx,
                                         r0,
                                         r1);
    ReadIdx2<1024, float, float, float2>(PinholeFocal_p_kp1,
                                         0 * PinholeFocal_p_kp1_num_alloc,
                                         global_thread_idx,
                                         r2,
                                         r3);
  };
  LoadUnique<1, float, float>(alpha, 0, (float*)inout_shared);
  if (global_thread_idx < problem_size) {
    ReadShared1<float>((float*)inout_shared, 0, r4);
  };
  __syncthreads();
  if (global_thread_idx < problem_size) {
    r2 = fmaf(r2, r4, r0);
    r4 = fmaf(r3, r4, r1);
    WriteIdx2<1024, float, float, float2>(
        out_PinholeFocal_step_kp1,
        0 * out_PinholeFocal_step_kp1_num_alloc,
        global_thread_idx,
        r2,
        r4);
  };
}

void PinholeFocalUpdateStep(float* PinholeFocal_step_k,
                            unsigned int PinholeFocal_step_k_num_alloc,
                            float* PinholeFocal_p_kp1,
                            unsigned int PinholeFocal_p_kp1_num_alloc,
                            const float* const alpha,
                            float* out_PinholeFocal_step_kp1,
                            unsigned int out_PinholeFocal_step_kp1_num_alloc,
                            size_t problem_size) {
  if (problem_size == 0) {
    return;
  }

  const int n_blocks = (problem_size + 1024 - 1) / 1024;
  PinholeFocalUpdateStepKernel<<<n_blocks, 1024>>>(
      PinholeFocal_step_k,
      PinholeFocal_step_k_num_alloc,
      PinholeFocal_p_kp1,
      PinholeFocal_p_kp1_num_alloc,
      alpha,
      out_PinholeFocal_step_kp1,
      out_PinholeFocal_step_kp1_num_alloc,
      problem_size);
}

}  // namespace caspar