#ifndef __INSTANCING_INC
#define __INSTANCING_INC

#include "globals.cginc"
#include "interpolators.cginc"

void instance_distance_culling(inout v2f i) {
#if defined(_INSTANCE_DISTANCE_CULLING)
  // We want to measure the distance from the instance's transform to the camera.
  float3 instance_pos = mul(unity_ObjectToWorld, float4(0, 0, 0, 1)).xyz;
  float distance = length(_WorldSpaceCameraPos - instance_pos);
  if (distance > _Instance_Distance_Culling_Distance) {
    discard;
  }
#endif  // _INSTANCE_DISTANCE_CULLING
}

void instancing_frag(v2f i) {
  instance_distance_culling(i);
}

#endif  // __INSTANCING_INC