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


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#ifndef VOLUMETRICS
void node_bsdf_diffuse(vec4 color, float roughness, vec3 N, out Closure result)
{
  N = normalize(N);
  result = CLOSURE_DEFAULT;
  eevee_closure_diffuse(N, color.rgb, 1.0, true, result.radiance);
  result.radiance = render_pass_diffuse_mask(color.rgb, result.radiance * color.rgb);
  closure_load_ssr_data(vec3(0.0), 0.0, N, viewCameraVec, -1, result);
}
#else
/* Stub diffuse because it is not compatible with volumetrics. */
#  define node_bsdf_diffuse
#endif