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Kenneth Graunke authored
ES prohibits this, but GL appears to allow it. We at least need this much, or else we'll crash as there's no source to read from. This fixed crashes in the ES tests before I realized I needed to prohibit stencil instead. Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Ian Romanick <ian.d.romanick@intel.com> Reviewed-by: Brian Paul <brianp@vmware.com> Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>
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