Changes

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| Unknown. An unconfirmed theory is that this is used for variable-size primitives (GL_SUBD_PRIM_DMP), for which the index buffer format is altered slightly (each sequence of indices constituting a primitive is prepended a number indicating the primitive size).

| Unknown. An unconfirmed theory is that this is used for variable-size primitives (GL_SUBD_PRIM_DMP/GL_GEOMETRY_PRIMITIVE_DMP), for which the index buffer format is altered slightly (each sequence of indices constituting a primitive is prepended a number indicating the primitive size).

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