Function renderPixelStandard

tutorials/viewer/viewer_device.cpp:204–282

task that renders a single screen tile */

/* task that renders a single screen tile */
void renderPixelStandard(const TutorialData& data,
                         int x, int y, 
                         int* pixels,
                         const unsigned int width,
                         const unsigned int height,
                         const float time,
                         const ISPCCamera& camera,
                         RayStats& stats,
                         const RTCFeatureFlags feature_mask)
{
  /* initialize sampler */
  RandomSampler sampler;
  RandomSampler_init(sampler, (int)x, (int)y, 0);

  /* initialize ray */
  float ray_time = data.motion_blur ? RandomSampler_get1D(sampler) : time;
  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, ray_time);

  /* intersect ray with scene */
  RTCIntersectArguments args;
  rtcInitIntersectArguments(&args);
  args.flags = data.iflags_coherent;
#if RTC_MIN_WIDTH
  args.minWidthDistanceFactor = 0.5f*data.min_width/width;
#endif
  args.feature_mask = feature_mask;
  
  rtcTraversableIntersect1(data.traversable,RTCRayHit_(ray),&args);
  RayStats_addRay(stats);

  /* shade background black */
  if (ray.geomID == RTC_INVALID_GEOMETRY_ID) {
    pixels[y*width+x] = 0;
    return;
  }

  /* shade all rays that hit something */
  Vec3fa color = Vec3fa(0.5f);

  /* compute differential geometry */
  DifferentialGeometry dg;
  dg.geomID = ray.geomID;
  dg.primID = ray.primID;
  dg.u = ray.u;
  dg.v = ray.v;
  dg.P  = ray.org+ray.tfar*ray.dir;
  dg.Ng = ray.Ng;
  dg.Ns = ray.Ng;

#if 0
  if (data.use_smooth_normals)
    if (ray.geomID != RTC_INVALID_GEOMETRY_ID) // FIXME: workaround for ISPC bug, location reached with empty execution mask
    {
      Vec3fa dPdu,dPdv;
      auto geomID = ray.geomID; {
        rtcInterpolate1(rtcGetGeometry(data.scene,geomID),ray.primID,ray.u,ray.v,RTC_BUFFER_TYPE_VERTEX,0,nullptr,&dPdu.x,&dPdv.x,3);
      }
      dg.Ns = cross(dPdv,dPdu);