Function renderPixelStandard

tutorials/next_hit/next_hit_device.cpp:306–402

task that renders a single screen tile */

/* task that renders a single screen tile */
Vec3ff renderPixelStandard(const TutorialData& data, float x, float y,
                           const unsigned int width,
                           const unsigned int height,
                           const ISPCCamera& camera,
                           RayStats& stats,
                           const RTCFeatureFlags feature_mask)
{
  /* initialize sampler */
  const int ix = (int)x;
  const int iy = (int)y;
  RandomSampler mysampler;
  RandomSampler_init(mysampler, ix, iy, 0);
  
  /* initialize ray */
  Ray ray(Vec3fa(camera.xfm.p), Vec3fa(normalize(x*camera.xfm.l.vx + y*camera.xfm.l.vy + camera.xfm.l.vz)), 0.0f, inf, 0.0f);
  ray.Ng = {0.0f, 1.0f, 0.0f};
  ray.flags = 0;
  ray.id = 0;
  ray.u = ray.v = 0.0f;

  /* either gather hits in single pass or using multiple passes */
  HitList hits(data);
  switch (data.next_hit_mode)
  {
  case SINGLE_PASS:
    single_pass(data,ray,hits,mysampler,stats,feature_mask);
    break;
  
  case MULTI_PASS_FIXED_NEXT_HITS:
    multi_pass (data,ray,hits,data.max_next_hits,mysampler,stats,feature_mask);
    break;
#if !defined(EMBREE_SYCL_TUTORIAL)
  case MULTI_PASS_OPTIMAL_NEXT_HITS: {
    int num_prev_hits = max(1,data.num_prev_hits[iy*width+ix]);
    multi_pass (data,ray,hits,num_prev_hits,mysampler,stats,feature_mask);
    break;
  }
  case MULTI_PASS_ESTIMATED_NEXT_HITS: {
    int estimated_num_next_hits = (int) min((float)data.max_next_hits, max(1.0f, 0.5f/data.curve_opacity));
    multi_pass (data,ray,hits,estimated_num_next_hits,mysampler,stats,feature_mask);
    break;
  }
#endif
  default:
    assert(false);
  }

  /* verify result with gathering all hits */
  bool has_error = false;
  if (data.verify || data.visualize_errors)
  {
    /* repeat using a single pass, which is assumed to produce the correct result */
    HitList verify_hits(data);
    RandomSampler verify_sampler;
    RandomSampler_init(verify_sampler, ix, iy, 0);
    single_pass(data,ray,verify_hits,verify_sampler,stats,feature_mask);

    if (verify_hits.size() != hits.size())