source/blender/draw/modes/shaders/paint_face_selection_vert.glsl


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in vec3 pos;
in vec4 nor; /* select flag on the 4th component */

void main()
{
  vec3 world_pos = point_object_to_world(pos);
  gl_Position = point_world_to_ndc(world_pos);

  /* Don't draw faces that are selected. */
  if (nor.w > 0.0) {
    gl_Position = vec4(0.0, 0.0, 0.0, 1.0);
  }
  else {
#ifdef USE_WORLD_CLIP_PLANES
    world_clip_planes_calc_clip_distance(world_pos);
#endif
  }
}