Function rebuild_instances

tutorials/forest/forest_device.cpp:293–331

}

void rebuild_instances(size_t old_num_trees)
{
  if (instances) {
    alignedFree(instances);
    instances = nullptr;
    g_memory_consumed -= old_num_trees * sizeof(RTCGeometry);
  }

  if (g_use_instance_array)
  {
#if defined(EMBREE_SYCL_TUTORIAL)
    void* tree_ids_device = data.tree_ids_device;
    void* tree_transforms_device = data.tree_transforms_device;
#else
    void* tree_ids_device = nullptr;
    void* tree_transforms_device = nullptr;
#endif
    instance_array = rtcNewGeometry(g_device, RTC_GEOMETRY_TYPE_INSTANCE_ARRAY);
    rtcSetGeometryInstancedScenes(instance_array,(RTCScene*)scene_trees_selected,6);
    rtcSetSharedGeometryBufferHostDevice(instance_array, RTC_BUFFER_TYPE_INDEX,     0, RTC_FORMAT_UINT,                  (void*)data.tree_ids_host, tree_ids_device, 0, sizeof(unsigned int),  num_trees);
    rtcSetSharedGeometryBufferHostDevice(instance_array, RTC_BUFFER_TYPE_TRANSFORM, 0, RTC_FORMAT_FLOAT4X4_COLUMN_MAJOR, (void*)data.tree_transforms_host, tree_transforms_device, 0, sizeof(AffineSpace3fa), num_trees);
    rtcAttachGeometry(data.g_scene,instance_array);
    rtcReleaseGeometry(instance_array);
    rtcCommitGeometry(instance_array);
  }
  else
  {
    instances = (RTCGeometry*) alignedMalloc((num_trees)*sizeof(RTCGeometry),16);
    g_memory_consumed += num_trees * sizeof(RTCGeometry);
    for (unsigned int i = 0; i < num_trees; ++i) {
      instances[i] = rtcNewGeometry(g_device, RTC_GEOMETRY_TYPE_INSTANCE);
      rtcSetGeometryInstancedScene(instances[i],scene_trees_selected[data.tree_ids_host[i]]);
      rtcSetGeometryTransform(instances[i],0,RTC_FORMAT_FLOAT4X4_COLUMN_MAJOR,(float*)&data.tree_transforms_host[i]);
      rtcAttachGeometry(data.g_scene,instances[i]);
      rtcReleaseGeometry(instances[i]);
      rtcCommitGeometry(instances[i]);
    }
  }
}

/* task that renders a single screen tile */
void renderPixelStandard(const TutorialData& data,