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Roland Scheidegger authored
Previously the code would just redirect requests for attributes which don't exist to use output 0. Rework this to output all zeros instead which seems more useful - in particular some extensions like ARB_fragment_layer_viewport require 0 in the fs even if it wasn't output by previous stages. That way, drivers don't have to special case this depending if the vs/gs outputs some attribute or not. Reviewed-by: Brian Paul <brianp@vmware.com> Reviewed-by: Jose Fonseca <jfonseca@vmware.com> Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
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