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


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#ifndef VOLUMETRICS
void node_ambient_occlusion(
    vec4 color, float distance, vec3 normal, out vec4 result_color, out float result_ao)
{
  vec3 bent_normal;
  vec4 rand = texelfetch_noise_tex(gl_FragCoord.xy);
  OcclusionData data = occlusion_load(viewPosition, 1.0);

  vec3 V = cameraVec;
  vec3 N = normalize(normal);
  vec3 Ng = safe_normalize(cross(dFdx(worldPosition), dFdy(worldPosition)));

  result_ao = diffuse_occlusion(data, V, N, Ng);
  result_color = result_ao * color;
}
#else
/* Stub ambient occlusion because it is not compatible with volumetrics. */
#  define node_ambient_occlusion(a, b, c, d, e) (e = CLOSURE_DEFAULT)
#endif