source/blender/gpu/shaders/compositor/library/gpu_shader_compositor_normal.glsl


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void node_composite_normal(vec3 input_vector,
                           vec3 input_normal,
                           out vec3 result_normal,
                           out float result_dot)
{
  vec3 normal = normalize(input_normal);
  result_normal = normal;
  result_dot = -dot(input_vector, normal);
}