source/blender/draw/engines/workbench/shaders/workbench_object_outline_lib.glsl


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#define OBJECT_OUTLINE_OFFSET 1

float calculate_object_outline(usampler2D objectId, ivec2 texel, uint object_id)
{
  uvec4 oid_offset = uvec4(
      texelFetchOffset(objectId, texel, 0, ivec2(0, OBJECT_OUTLINE_OFFSET)).r,
      texelFetchOffset(objectId, texel, 0, ivec2(0, -OBJECT_OUTLINE_OFFSET)).r,
      texelFetchOffset(objectId, texel, 0, ivec2(-OBJECT_OUTLINE_OFFSET, 0)).r,
      texelFetchOffset(objectId, texel, 0, ivec2(OBJECT_OUTLINE_OFFSET, 0)).r);

  return dot(vec4(equal(uvec4(object_id), oid_offset)), vec4(0.25));
}