source/blender/gpu/shaders/material/gpu_shader_material_output_material.glsl


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void node_output_material(Closure surface,
                          Closure volume,
                          vec3 displacement,
                          float alpha_threshold,
                          float shadow_threshold,
                          out Closure result)
{
#ifdef VOLUMETRICS
  result = volume;
#else
  result = surface;
#  if defined(USE_ALPHA_HASH)
  /* Alpha clip emulation. */
  if ((rayType != EEVEE_RAY_SHADOW) ? (alpha_threshold >= 0.0) : (shadow_threshold >= 0.0)) {
    float alpha = saturate(1.0 - avg(result.transmittance));
    result.transmittance = vec3(step(alpha, max(alpha_threshold, shadow_threshold)));
  }
#  endif
#endif
}